CA2108080C - Pulse generator - Google Patents
Pulse generatorInfo
- Publication number
- CA2108080C CA2108080C CA002108080A CA2108080A CA2108080C CA 2108080 C CA2108080 C CA 2108080C CA 002108080 A CA002108080 A CA 002108080A CA 2108080 A CA2108080 A CA 2108080A CA 2108080 C CA2108080 C CA 2108080C
- Authority
- CA
- Canada
- Prior art keywords
- voltage
- circuit
- current
- transformer
- pulse generator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
- H03K3/53—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback
- H03K3/57—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback the switching device being a semiconductor device
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/80—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using non-linear magnetic devices; using non-linear dielectric devices
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/0036—Means reducing energy consumption
Abstract
The pulse generator has a switch circuit for switching a supply of a first current through a circuit. A
first condenser is serially connected to the switch circuit and charged by the first current. A voltage raising transformer, used to obtain a voltage output by the first current, has a primary winding serially connected to the first condenser, and a secondary winding. A magnetic switch transformer, used to switch current flow, has a primary winding serially connected to the secondary winding of the voltage raising transformer, and a secondary winding. A
second condenser is connected to the secondary winding of the magnetic switch transformer and charged by an output therefrom. A discharge circuit is connected to the second condenser to generate a pulse discharge when a charged voltage of the second condenser is applied thereto by switching the magnetic switch transformer.
first condenser is serially connected to the switch circuit and charged by the first current. A voltage raising transformer, used to obtain a voltage output by the first current, has a primary winding serially connected to the first condenser, and a secondary winding. A magnetic switch transformer, used to switch current flow, has a primary winding serially connected to the secondary winding of the voltage raising transformer, and a secondary winding. A
second condenser is connected to the secondary winding of the magnetic switch transformer and charged by an output therefrom. A discharge circuit is connected to the second condenser to generate a pulse discharge when a charged voltage of the second condenser is applied thereto by switching the magnetic switch transformer.
Description
PULSE GENERATOR
BACKGROUND OF THE INVENTION
l.Field of The Invention The present invention relates generally to a pulse generator generating short pulse having high voltage and large amount of current. Specifically, the present invention relates to such pulse generator including a semiconductor switch and a saturable o transformer.
BACKGROUND OF THE INVENTION
l.Field of The Invention The present invention relates generally to a pulse generator generating short pulse having high voltage and large amount of current. Specifically, the present invention relates to such pulse generator including a semiconductor switch and a saturable o transformer.
2.Description of The Backqround Art Generally, apparatus for pulse laser excitation, pulse plasma generation or pulse denitration, is well known as a pulse generator. In order to obtain desired pulse, using discharging switches, such as thyratron and trigatron switches, to directly switch high voltage and large amount of current. A combination of a - semiconductor switch and a saturable reactor functions as a magnetic switch is also utilized.
Additionally, one saturable transformer for raising voltage concurrently with pulse compressing to reduce the load of a switching device is also utilized for pulse generation.
Fig. 5 illustrates a conventional circuit 25 including a saturable reactor. A wave form generated from the circuit is also illustrated in the figure. A
plurality of thyristors TH, function as a semiconductor switch at high voltage, are connected in series. A
condenser Cl1 connected to the circuit is charged by high 30 voltage. A reactor L is located at the upstream of the condenser Cl1. A first current Il is generated by a short-circuit from the series circuit including the condenser Cl1 and the reactor L. Polarity of the 2 ~ 0 8 ~ 8 0 condenser Cll is inverted thereby to generate voltage twice as that obtained from LC inversion via the series connection of condensers Cll and Cl2. A second current I2 of compressed pulse is generated by this high voltage, 5 at a circuit including a saturable reactor SRl, condensers Cll, Cl2 and C2 which are connected in series.
Then, A third current I3 ofcompressed pulse is generated by the voltage of the condenser C2, at a circuit including a saturable reactor SR2, condensers C3 and C2 10 which are connected in series. Finally, a compressed pulse I4 having large amount of current and high voltage is generated at the circuit including a saturable reactor SR3 and a discharge tube DT.
However, in the conventional pulse generator including discharging switch devices, lifetime of the switch devices is very short, i.e., l07 to 108 pUl se.
Therefore, when the circuit is operated repeatedly, - duration of the switch devices is limited.
On the other hand, in the conventional pulse 20 generator including the combination of the semiconductor switch and the saturable reactor, withstand voltage of the switch devices is smaller than that of the discharging switch device. Therefore, a plurality of semiconductor switches must be connected in series in 25 order to generate high voltage. This causes the switch circuit to be enlarged because a drive circuit and a snubber circuit are added to each switch device corresponding to the number of series connection. In addition, voltage shared by respective switch becomes 30 unequal if switch timing is upset. On the other hand, the switches may be connected in parallel, however, excess current flows through the switch if switch timing is upset or any one of switches is failed. This causes ~ Q~ 80 other switches to be failed.
Utilizing a pulse transformer for voltage raising to reduce the number of the switch device, and reducing the switching voltage to about l/2 of that of 5 output voltage by a LC inversion circuit are both available, however, number of the switch device and number of magnetic compressed pulse are not minimized.
This enlarges the circuit compared with that including the discharging switch.
Minimization of the circuit may be done by utilizing single saturable transformer to unite function of voltage raising and magnetic pulse compression.
However, turns number of the secondary winding of the saturable transformer becomes larger to raise the voltage raising ratio because one transformer unites two function. This increases inductance causing LC resonance time during pulse compression to be lengthened. Thus, - generation of short pulse is limi-ted. On the other hand, turns ratio of the winding must be reduced to decrease 20 inductance at the secondary area of the saturable transformer. This causes voltage raising ratio to be reduced and load on the switch device to be increased.
SUMMARY OF THE INVENTION
It is therefore a principal object of the 2~ present invention to provide a pulse generator which can generate pulse having high voltage and large amount of current.
It is another object of the present invention to provide a pulse generator including a semiconductor 30 switch device of which control voltage is reduced.
It is a further object of the present invention to minimize a size of such pulse generator.
In order to accomplish the aforementioned and c ... ~
2 ~ 8 ~
other objects, there is provided a pulse generator comprising:
switch means for switching a supply of a first current through a circuit, a first condenser serially connected to said switch means and charged by said first current, voltage raising means for obtaining a voltage output by said first current, said voltage raising means having a primary winding and a secondary winding, said primary winding being serially connected to said first condenser, magnetic switch means for switching current flow, said magnetic switch means having a primary winding and a secondary winding, said primary winding being serially connected to said secondary winding of said voltage raising means, a second condenser connected to said secondary winding of said magnetic switch means and charged by an output therefrom, and discharging means for generating a pulse discharge, said discharging means being connected to said second condenser to generate a pulse discharge when a charged voltage of said second condenser is applied thereto by switching said magnetic switch means.
Preferably, the switch means can be formed of a plurality of semiconductor switches connected serially or in parallel.
Preferably when the switch means is formed of switches in series, the voltage raising means can be formed of a voltage raising transformer. on the other hand, when the switch means is formed of switches in parallel, the voltage raising transformer can be formed of plurality of pulse transformers or saturable transformers corresponding to the semiconductor switches respectively. The primary and secondary windings of the voltage raising means may be wound at the turns ratio such that high voltage raising 2 ~ 8 ~
ratio is obtainable, wherein the voltage raising means is a voltage raising transformer.
Preferably, the magnetic switch means can be a saturable transformer having a core which is saturable when the second condenser is completely charged. A number of turns of the secondary winding of the magnetic switch means is reduced to reduce voltage raising ratio thereat.
According to the present invention, there is also provided a pulse generator, comprising:
a) semiconductor switching means, having at least one semiconductor switching device, for operatively turning on a first current:
b) first charging means connected to said semiconductor switching means and into which the first current is supplied;
c) a voltage boosting transformer having a primary winding connected to said first charging means and a secondary winding across which a boosted voltage is generated, wherein a boosted voltage value is determined according to a winding ratio of said voltage boosting transformer and according to a value of the first current;
d) magnetic switch means having a saturable transformer, said saturable transformer having a primary winding and a secondary winding thereof, said primary winding of said magnetic switch means being connected to the secondary winding of said voltage boosting transformer;
e) second charging means connected to the secondary winding of said magnetic switch means for charging a voltage across the secondary winding of said magnetic switch means; and f) discharging means connected to said second charging means for generating a pulse discharge thereacross when the charged voltage in said second charging means is applied thereto according to a magnetic switching action of said 2~ ~Q 80 5a magnetic switch means.
According to the present invention, there is also provided a pulse generator, comprising:
a first switch circuit to switch the supply of a first current through a circuit;
a first charging circuit coupled to said first switch circuit and charged by said first current;
a voltage boosting circuit coupled to said first charging circuit to provide a boosted voltage;
a reversible switch circuit couled to said voltage boosting circuit to supply a second current flowing in a first direction and having a switching action to allow a third current to flow in a second direction opposite to said first direction;
a second charging circuit coupled to said reversible switch circuit and charged by said second current to supply said third current upon said switching action of said reversible switch circuit; and a discharge circuit coupled to said second charging circuit and charged by said third current to generate a pulse discharge across said discharge circuit.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will be understood more fully from the detailed description given herebelow and from the accompanying drawings of the preferred embodiments of the invention. However, the drawings are not intended to imply limitation of the invention to a specific embodiment, but are for explanation and understanding only.
5b ~ ~ 0 8 0 8 0 In the drawings:
Fig. 1 is a schematic diagram illustrating a circuit of a first embodiment according to the present invention;
Fig. 2 is a schematic diagram illustrating a circuit of a second embodiment according to the present invention; - -Fig. 3 is a schematic diagram illustrating a circuit of a third embodiment according to the present invention;
Fig. 4 is a schematic diagram illustrating a circuit of a fourth embodiment according to the present invention; and Fig. 5 is a schematic diagram illustrating a circuit and a wave form generated therefrom according to prior art.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to Fig. 1, showing a schematic diagram a first embodiment according to the present invention, a semiconductor switch SW is arranged as an initial step switch including a semiconductor switch device, such as a GTO thyristor, a SI thyristo~ and a 2108~80 2 ~ Q 8 O 8 O
IGBT, and a gate control circuit and a snubber circuit ofthe switch device. A first saturable reactor SIl, a first condenser Co and a primary winding of a voltage raising transformer T for raising voltage of a circuit, 5 are connected in series. The circuit is connected to the semiconductor switch SW in series. A primary winding of a saturable transformer STl is connected in series to a secondary winding of the voltage raising transformer T, then a secondary winding of the saturable transformer STl 10 is parallelly connected to a series circuit between a second condenser Cl and a condenser Cp. A discharge tube DT and a second saturable reactor SI2 are respectively parallelly connected to the condenser Cp.
The first and second saturable reactors SIl and SI2 include magnetic cores having large effective magnetic flux density (~ B), e.g., a magnetic core formed of ferro-amorphous alloy, ferro-ultramicrocrystal alloy, - or cobalt amorphous alloy.- -The first reactor SIl functions as a magnetic assistant to assist operation of 20 the semiconductor switch SW, on the other hand, the second reactor SI2 functions as means for decreasing pre-pulse generation by bypassing current charged at the second condenser Cl through the discharge tube DT. Thus, discharge of the condenser Cl is blocked to prevent 25 generation of pre-pulse at the discharge tube DT. The second reactor SI2 also supplies current toward the discharge tube DT by blocking discharging current from the condenser Cl. The second saturable reactor SI2 can be substituted by an air-core.
The first saturable transformer STl includes a magnetic core having high rectangular ratio, e.g., a magnetic core formed of ferro-amorphous alloy, ferro-ultramicrocrystal alloy or cobalt amorphous alloy. The 211 ~ 80 primary winding and the secondary winding of the transformer STl are wound such that winding ratio is regulated to slightly raise voltage or to decrease voltage. For example, winding ra-tio of the transformer STl is prefer to be determined at 1:2.
The condensers Co, Cl and Cp can be formed of materials having low inductance and high voltage resistance t-o generate short pulse of high voltage. A
ceramic condenser or an oil condenser is preferably used for this purpose.
The secondary winding of the voltage raising transformer T is regulated to have larger turns number than that of the primary winding thereof such that high voltage raising ratio can be obtained.
The aforementioned embodiment operates as follows.
The first condenser Co is charged at the high voltage by D.C. power source DC. Then, the semiconductor switch SW switches current ON-to supply the primary current Io from the condenser C0 toward the primary winding of the voltage raising transformer T via the first saturable reactor SI1 and the semiconductor switch SW .
According to current flow of Io, the voltage raising transformer T transforms voltage raised corresponding to the turns ratio, e.g., 1:6, toward the secondary winding thereof. The saturable reactor SII
functions as a magnetic assistant of the semiconductor switch SW to reduce the switching loss of the switch SW.
Thus, the switch SW can be used at current peak higher than that of switching done without the magnetic assistant.
Current Il flows at the secondary area of the voltage raising transformer T from the secondary winding .~ ' '~ .
2 11 ~
thereof toward the first winding of the saturable transformer STl. According to current flow of Il, the saturable transformer STl is operated in non-saturation area. The voltage raised corresponding to turns ratio of the winding then raised voltage is obtained at the secondary winding of the saturable transformer STl. The condenser Cl is charged by current I2 in the non-saturation area. During charging, the saturable reactor SI2 is magnetized in the direction of the current I2 is o easily flowable. The saturable transformer STl is designed such that the core thereof is saturated when flow of current Iz is ended. Thus, when flow of current Iz is ended, the saturable transformer STl is operated in the saturation area. Then, the primary area and the secondary area of the transformer STl are unconnected.
Electric charge charged at the condenser Cl is saturated by the saturable transformer STl, therefore, reversed - current I2' flows, then electric charge transforms to the condenser Cp. Thus, voltage at the discharge tube DT
20 reaches to the level of generation. The saturable transformer STl does not function as the transformer but as the magnetic switch, i.e., the saturable reactor, to supply current I2' of compressed pulse from the condenser Cl toward the secondary winding of the transformer STl.
25 Short-circuit current is supplied to the discharge tube DT by this current I2' , i.e., short pulse having high voltage and large amount of current is supplied to the tube DT.
According to the aforementioned embodiment, the 30 voltage raising transformer T and the saturable transformer STl form a cascade connection. Thus, the voltage raising transformer T exclusively operates as a voltage raising device to raise voltage raising ratio, 2108~80 g therefore, desired raised voltage can be obtained. The saturable transformer ST1 decreases the voltage raising ratio and turns number of the secondary winding thereof to reduce inductance after saturation. Therefore, the saturable transformer STl exclusively operates as a pulse compressor to raise compressing ratio of pulse length.
Therefore, the semiconductor switch SW can be operated at the lower voltage. Furthermore, high voltage and pulse compressed current can be provided to the 10 loaded area.
Referring now to Fig. 2, showing a second embodiment of the present invention, the same character illustrates the same component as the first embodiment.
A plurality of semiconductor switches SW are connected in parallel, wherein each circuit respectively has a condenser Co and a saturable reactor SIo via a pulse transformer PT having turns ratio of El/2:E2/2. The switch can be substituted by GT0-. The condensers C0 are charged and the pulse transformers PT raise pulse voltage 20 of the condensers Co. The secondary area of pulse transformers are connected in series. A saturable transformer ST, which raises and compresses voltage obtained from the series connection, is connected to the circuit at the downstream of the pulse transformers PT.
25 A second condenser C1 is connected to the circuit at the downstream of the saturable transformer ST to charge voltage generated at the secondary area of the transformer ST.
When operated, the switches transform electric 30 charge charged at the first condensers Co to the second condenser C1 to supply high voltage pulse to the loaded area connected to the secondary area of the saturable transformer ST. The saturable transformer ST is designed 21~8U80 such that the core thereof can be saturated when charging the second condenser Cl is finished.
Generally, generation of excess voltage and current is caused by timing upset of the semiconductor 5 switches parallelly connected. According to the second embodiment, such problems can be avoided by location of respective pulse transformer against corresponding semiconductor switch. Furthermore, because the circuit is connected in series at the secondary area of the o saturable transformer ST, pulse having high voltage and large amount of current can be generated from the circuit.
Referring now to Fig. 3, showing a third embodiment of the present invention, the same character 15 illustrates the same component as the first embodiment.
A plurality of semiconductor switches SW are connected in parallel via respective saturable transformer ST having - turns ratio of El/2:E2/2. Each--circuit includes a first condenser Co and a saturable reactor SIo. The switch SW
20 can be substituted by GTO. The condensers Co are charged and the saturable transformers ST raise or compress pulse voltage of the condensers Co. The secondary area of saturable transformers ST are connected in series. A
second condenser Cl is connected to the circuit at the 25 downstream of the saturable transformers ST to charge voltage generated at the secondary area of the transformer ST.
When operated, the switches transform electric charge charged at the first condensers Co to the second 30 condenser Cl to supply high voltage pulse to the loaded area connected to the secondary area of the saturable transformer ST. The saturable transformers ST are designed such that the cores thereof can be saturated when charging the second condenser C1 is finished.
According to the third embodiment, problems caused by switch timing upset can be avoided by location of respective saturable transformer against corresponding semiconductor switch. Furthermore, because the circuit is connected in series at the secondary area of the saturable transformer ST, pulse having high voltage and large amount of current can be generated from the circuit.
Referring now to Fig. 4, showing a fourth embodiment of the present invention, the same character illustrates the same component as the first embodiment.
A plurality of semiconductor switches SW are connected in parallel via respective pulse transformer PT having turns 15 ratio of El/2:E2/2. Each circuit includes a first condenser CO and a saturable reactor SIo. The switch SW
can be substituted by GTO. The condensers CO are charged - and the pulse transformers ST ra-ise pulse voltage of the condensers Co. The secondary area of pulse transformers 20 PT are connected in series. A saturable transformer ST, which raises or compresses voltage obtained from the series connection, is connected to the circuit at the downstream of the pulse transformers PT. A second condenser C1 is parallelly connected to the circuit at 25 the downstream of the saturable transformer ST to charge voltage generated at the secondary area of the transformer ST.
When operated, the switches transform electric charge charged at the first condensers Co to the second 30 condenser Cl to supply high voltage pulse to the loaded area connected to the secondary area of the saturable transformer ST. The saturable transformer ST is designed such that the core thereof can be saturated when charging 210808~
the second condenser Cl is finished.
According to the fourth embodiment, problems caused by switch timing upset can be avoided by location of respective pulse transformer against corresponding semiconductor switch. Furthermore, because the circuit is connected in series at the secondary area of the saturable transformer ST, pulse having high voltage and large amount of current can be generated from the circuit.
According to the present invention, pulse voltage generated by the semiconductor switch SW and the first condenser CO can be raised by location of the voltage raising transformer T or the pulse transformer PT
or the saturable transformer ST. The raised voltage is 15 compressed by the saturable transformer ST having smaller turns number of secondary winding to obtain short pulse.
Therefore, control voltage of the primary step switch can be decreased by the raised voltage of the transformer.
Then voltage load on the semiconductor switch can also be 20 reduced. Therefore, connection steps of the semiconductor switch devices can be minimized. Thus, the switch circuit and the adjacent circuit thereof can be simplified and minimized.
Additionally, the pulse voltage raised by the 25 transformer is compressed by the saturable transformer.
Therefore, voltage raising ratio of the saturable transformer and turns number of the secondary winding can be minimized. Thus, the core volume of the saturable transformer can be reduced to allow minimization of the 30 saturable transformer.
While the present invention has been disclosed in terms of the preferred embodiment in order to facilitate better understanding of the invention, it 2108(~80 should be appreciated that the invention can be embodied in various ways without depending from the principle of the invention. Therefore, the invention should be understood to include all possible embodiments and 5 modification to the shown embodiments which can be embodied without departing from the principle of the inventions as set forth in the appended claims.
Additionally, one saturable transformer for raising voltage concurrently with pulse compressing to reduce the load of a switching device is also utilized for pulse generation.
Fig. 5 illustrates a conventional circuit 25 including a saturable reactor. A wave form generated from the circuit is also illustrated in the figure. A
plurality of thyristors TH, function as a semiconductor switch at high voltage, are connected in series. A
condenser Cl1 connected to the circuit is charged by high 30 voltage. A reactor L is located at the upstream of the condenser Cl1. A first current Il is generated by a short-circuit from the series circuit including the condenser Cl1 and the reactor L. Polarity of the 2 ~ 0 8 ~ 8 0 condenser Cll is inverted thereby to generate voltage twice as that obtained from LC inversion via the series connection of condensers Cll and Cl2. A second current I2 of compressed pulse is generated by this high voltage, 5 at a circuit including a saturable reactor SRl, condensers Cll, Cl2 and C2 which are connected in series.
Then, A third current I3 ofcompressed pulse is generated by the voltage of the condenser C2, at a circuit including a saturable reactor SR2, condensers C3 and C2 10 which are connected in series. Finally, a compressed pulse I4 having large amount of current and high voltage is generated at the circuit including a saturable reactor SR3 and a discharge tube DT.
However, in the conventional pulse generator including discharging switch devices, lifetime of the switch devices is very short, i.e., l07 to 108 pUl se.
Therefore, when the circuit is operated repeatedly, - duration of the switch devices is limited.
On the other hand, in the conventional pulse 20 generator including the combination of the semiconductor switch and the saturable reactor, withstand voltage of the switch devices is smaller than that of the discharging switch device. Therefore, a plurality of semiconductor switches must be connected in series in 25 order to generate high voltage. This causes the switch circuit to be enlarged because a drive circuit and a snubber circuit are added to each switch device corresponding to the number of series connection. In addition, voltage shared by respective switch becomes 30 unequal if switch timing is upset. On the other hand, the switches may be connected in parallel, however, excess current flows through the switch if switch timing is upset or any one of switches is failed. This causes ~ Q~ 80 other switches to be failed.
Utilizing a pulse transformer for voltage raising to reduce the number of the switch device, and reducing the switching voltage to about l/2 of that of 5 output voltage by a LC inversion circuit are both available, however, number of the switch device and number of magnetic compressed pulse are not minimized.
This enlarges the circuit compared with that including the discharging switch.
Minimization of the circuit may be done by utilizing single saturable transformer to unite function of voltage raising and magnetic pulse compression.
However, turns number of the secondary winding of the saturable transformer becomes larger to raise the voltage raising ratio because one transformer unites two function. This increases inductance causing LC resonance time during pulse compression to be lengthened. Thus, - generation of short pulse is limi-ted. On the other hand, turns ratio of the winding must be reduced to decrease 20 inductance at the secondary area of the saturable transformer. This causes voltage raising ratio to be reduced and load on the switch device to be increased.
SUMMARY OF THE INVENTION
It is therefore a principal object of the 2~ present invention to provide a pulse generator which can generate pulse having high voltage and large amount of current.
It is another object of the present invention to provide a pulse generator including a semiconductor 30 switch device of which control voltage is reduced.
It is a further object of the present invention to minimize a size of such pulse generator.
In order to accomplish the aforementioned and c ... ~
2 ~ 8 ~
other objects, there is provided a pulse generator comprising:
switch means for switching a supply of a first current through a circuit, a first condenser serially connected to said switch means and charged by said first current, voltage raising means for obtaining a voltage output by said first current, said voltage raising means having a primary winding and a secondary winding, said primary winding being serially connected to said first condenser, magnetic switch means for switching current flow, said magnetic switch means having a primary winding and a secondary winding, said primary winding being serially connected to said secondary winding of said voltage raising means, a second condenser connected to said secondary winding of said magnetic switch means and charged by an output therefrom, and discharging means for generating a pulse discharge, said discharging means being connected to said second condenser to generate a pulse discharge when a charged voltage of said second condenser is applied thereto by switching said magnetic switch means.
Preferably, the switch means can be formed of a plurality of semiconductor switches connected serially or in parallel.
Preferably when the switch means is formed of switches in series, the voltage raising means can be formed of a voltage raising transformer. on the other hand, when the switch means is formed of switches in parallel, the voltage raising transformer can be formed of plurality of pulse transformers or saturable transformers corresponding to the semiconductor switches respectively. The primary and secondary windings of the voltage raising means may be wound at the turns ratio such that high voltage raising 2 ~ 8 ~
ratio is obtainable, wherein the voltage raising means is a voltage raising transformer.
Preferably, the magnetic switch means can be a saturable transformer having a core which is saturable when the second condenser is completely charged. A number of turns of the secondary winding of the magnetic switch means is reduced to reduce voltage raising ratio thereat.
According to the present invention, there is also provided a pulse generator, comprising:
a) semiconductor switching means, having at least one semiconductor switching device, for operatively turning on a first current:
b) first charging means connected to said semiconductor switching means and into which the first current is supplied;
c) a voltage boosting transformer having a primary winding connected to said first charging means and a secondary winding across which a boosted voltage is generated, wherein a boosted voltage value is determined according to a winding ratio of said voltage boosting transformer and according to a value of the first current;
d) magnetic switch means having a saturable transformer, said saturable transformer having a primary winding and a secondary winding thereof, said primary winding of said magnetic switch means being connected to the secondary winding of said voltage boosting transformer;
e) second charging means connected to the secondary winding of said magnetic switch means for charging a voltage across the secondary winding of said magnetic switch means; and f) discharging means connected to said second charging means for generating a pulse discharge thereacross when the charged voltage in said second charging means is applied thereto according to a magnetic switching action of said 2~ ~Q 80 5a magnetic switch means.
According to the present invention, there is also provided a pulse generator, comprising:
a first switch circuit to switch the supply of a first current through a circuit;
a first charging circuit coupled to said first switch circuit and charged by said first current;
a voltage boosting circuit coupled to said first charging circuit to provide a boosted voltage;
a reversible switch circuit couled to said voltage boosting circuit to supply a second current flowing in a first direction and having a switching action to allow a third current to flow in a second direction opposite to said first direction;
a second charging circuit coupled to said reversible switch circuit and charged by said second current to supply said third current upon said switching action of said reversible switch circuit; and a discharge circuit coupled to said second charging circuit and charged by said third current to generate a pulse discharge across said discharge circuit.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will be understood more fully from the detailed description given herebelow and from the accompanying drawings of the preferred embodiments of the invention. However, the drawings are not intended to imply limitation of the invention to a specific embodiment, but are for explanation and understanding only.
5b ~ ~ 0 8 0 8 0 In the drawings:
Fig. 1 is a schematic diagram illustrating a circuit of a first embodiment according to the present invention;
Fig. 2 is a schematic diagram illustrating a circuit of a second embodiment according to the present invention; - -Fig. 3 is a schematic diagram illustrating a circuit of a third embodiment according to the present invention;
Fig. 4 is a schematic diagram illustrating a circuit of a fourth embodiment according to the present invention; and Fig. 5 is a schematic diagram illustrating a circuit and a wave form generated therefrom according to prior art.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to Fig. 1, showing a schematic diagram a first embodiment according to the present invention, a semiconductor switch SW is arranged as an initial step switch including a semiconductor switch device, such as a GTO thyristor, a SI thyristo~ and a 2108~80 2 ~ Q 8 O 8 O
IGBT, and a gate control circuit and a snubber circuit ofthe switch device. A first saturable reactor SIl, a first condenser Co and a primary winding of a voltage raising transformer T for raising voltage of a circuit, 5 are connected in series. The circuit is connected to the semiconductor switch SW in series. A primary winding of a saturable transformer STl is connected in series to a secondary winding of the voltage raising transformer T, then a secondary winding of the saturable transformer STl 10 is parallelly connected to a series circuit between a second condenser Cl and a condenser Cp. A discharge tube DT and a second saturable reactor SI2 are respectively parallelly connected to the condenser Cp.
The first and second saturable reactors SIl and SI2 include magnetic cores having large effective magnetic flux density (~ B), e.g., a magnetic core formed of ferro-amorphous alloy, ferro-ultramicrocrystal alloy, - or cobalt amorphous alloy.- -The first reactor SIl functions as a magnetic assistant to assist operation of 20 the semiconductor switch SW, on the other hand, the second reactor SI2 functions as means for decreasing pre-pulse generation by bypassing current charged at the second condenser Cl through the discharge tube DT. Thus, discharge of the condenser Cl is blocked to prevent 25 generation of pre-pulse at the discharge tube DT. The second reactor SI2 also supplies current toward the discharge tube DT by blocking discharging current from the condenser Cl. The second saturable reactor SI2 can be substituted by an air-core.
The first saturable transformer STl includes a magnetic core having high rectangular ratio, e.g., a magnetic core formed of ferro-amorphous alloy, ferro-ultramicrocrystal alloy or cobalt amorphous alloy. The 211 ~ 80 primary winding and the secondary winding of the transformer STl are wound such that winding ratio is regulated to slightly raise voltage or to decrease voltage. For example, winding ra-tio of the transformer STl is prefer to be determined at 1:2.
The condensers Co, Cl and Cp can be formed of materials having low inductance and high voltage resistance t-o generate short pulse of high voltage. A
ceramic condenser or an oil condenser is preferably used for this purpose.
The secondary winding of the voltage raising transformer T is regulated to have larger turns number than that of the primary winding thereof such that high voltage raising ratio can be obtained.
The aforementioned embodiment operates as follows.
The first condenser Co is charged at the high voltage by D.C. power source DC. Then, the semiconductor switch SW switches current ON-to supply the primary current Io from the condenser C0 toward the primary winding of the voltage raising transformer T via the first saturable reactor SI1 and the semiconductor switch SW .
According to current flow of Io, the voltage raising transformer T transforms voltage raised corresponding to the turns ratio, e.g., 1:6, toward the secondary winding thereof. The saturable reactor SII
functions as a magnetic assistant of the semiconductor switch SW to reduce the switching loss of the switch SW.
Thus, the switch SW can be used at current peak higher than that of switching done without the magnetic assistant.
Current Il flows at the secondary area of the voltage raising transformer T from the secondary winding .~ ' '~ .
2 11 ~
thereof toward the first winding of the saturable transformer STl. According to current flow of Il, the saturable transformer STl is operated in non-saturation area. The voltage raised corresponding to turns ratio of the winding then raised voltage is obtained at the secondary winding of the saturable transformer STl. The condenser Cl is charged by current I2 in the non-saturation area. During charging, the saturable reactor SI2 is magnetized in the direction of the current I2 is o easily flowable. The saturable transformer STl is designed such that the core thereof is saturated when flow of current Iz is ended. Thus, when flow of current Iz is ended, the saturable transformer STl is operated in the saturation area. Then, the primary area and the secondary area of the transformer STl are unconnected.
Electric charge charged at the condenser Cl is saturated by the saturable transformer STl, therefore, reversed - current I2' flows, then electric charge transforms to the condenser Cp. Thus, voltage at the discharge tube DT
20 reaches to the level of generation. The saturable transformer STl does not function as the transformer but as the magnetic switch, i.e., the saturable reactor, to supply current I2' of compressed pulse from the condenser Cl toward the secondary winding of the transformer STl.
25 Short-circuit current is supplied to the discharge tube DT by this current I2' , i.e., short pulse having high voltage and large amount of current is supplied to the tube DT.
According to the aforementioned embodiment, the 30 voltage raising transformer T and the saturable transformer STl form a cascade connection. Thus, the voltage raising transformer T exclusively operates as a voltage raising device to raise voltage raising ratio, 2108~80 g therefore, desired raised voltage can be obtained. The saturable transformer ST1 decreases the voltage raising ratio and turns number of the secondary winding thereof to reduce inductance after saturation. Therefore, the saturable transformer STl exclusively operates as a pulse compressor to raise compressing ratio of pulse length.
Therefore, the semiconductor switch SW can be operated at the lower voltage. Furthermore, high voltage and pulse compressed current can be provided to the 10 loaded area.
Referring now to Fig. 2, showing a second embodiment of the present invention, the same character illustrates the same component as the first embodiment.
A plurality of semiconductor switches SW are connected in parallel, wherein each circuit respectively has a condenser Co and a saturable reactor SIo via a pulse transformer PT having turns ratio of El/2:E2/2. The switch can be substituted by GT0-. The condensers C0 are charged and the pulse transformers PT raise pulse voltage 20 of the condensers Co. The secondary area of pulse transformers are connected in series. A saturable transformer ST, which raises and compresses voltage obtained from the series connection, is connected to the circuit at the downstream of the pulse transformers PT.
25 A second condenser C1 is connected to the circuit at the downstream of the saturable transformer ST to charge voltage generated at the secondary area of the transformer ST.
When operated, the switches transform electric 30 charge charged at the first condensers Co to the second condenser C1 to supply high voltage pulse to the loaded area connected to the secondary area of the saturable transformer ST. The saturable transformer ST is designed 21~8U80 such that the core thereof can be saturated when charging the second condenser Cl is finished.
Generally, generation of excess voltage and current is caused by timing upset of the semiconductor 5 switches parallelly connected. According to the second embodiment, such problems can be avoided by location of respective pulse transformer against corresponding semiconductor switch. Furthermore, because the circuit is connected in series at the secondary area of the o saturable transformer ST, pulse having high voltage and large amount of current can be generated from the circuit.
Referring now to Fig. 3, showing a third embodiment of the present invention, the same character 15 illustrates the same component as the first embodiment.
A plurality of semiconductor switches SW are connected in parallel via respective saturable transformer ST having - turns ratio of El/2:E2/2. Each--circuit includes a first condenser Co and a saturable reactor SIo. The switch SW
20 can be substituted by GTO. The condensers Co are charged and the saturable transformers ST raise or compress pulse voltage of the condensers Co. The secondary area of saturable transformers ST are connected in series. A
second condenser Cl is connected to the circuit at the 25 downstream of the saturable transformers ST to charge voltage generated at the secondary area of the transformer ST.
When operated, the switches transform electric charge charged at the first condensers Co to the second 30 condenser Cl to supply high voltage pulse to the loaded area connected to the secondary area of the saturable transformer ST. The saturable transformers ST are designed such that the cores thereof can be saturated when charging the second condenser C1 is finished.
According to the third embodiment, problems caused by switch timing upset can be avoided by location of respective saturable transformer against corresponding semiconductor switch. Furthermore, because the circuit is connected in series at the secondary area of the saturable transformer ST, pulse having high voltage and large amount of current can be generated from the circuit.
Referring now to Fig. 4, showing a fourth embodiment of the present invention, the same character illustrates the same component as the first embodiment.
A plurality of semiconductor switches SW are connected in parallel via respective pulse transformer PT having turns 15 ratio of El/2:E2/2. Each circuit includes a first condenser CO and a saturable reactor SIo. The switch SW
can be substituted by GTO. The condensers CO are charged - and the pulse transformers ST ra-ise pulse voltage of the condensers Co. The secondary area of pulse transformers 20 PT are connected in series. A saturable transformer ST, which raises or compresses voltage obtained from the series connection, is connected to the circuit at the downstream of the pulse transformers PT. A second condenser C1 is parallelly connected to the circuit at 25 the downstream of the saturable transformer ST to charge voltage generated at the secondary area of the transformer ST.
When operated, the switches transform electric charge charged at the first condensers Co to the second 30 condenser Cl to supply high voltage pulse to the loaded area connected to the secondary area of the saturable transformer ST. The saturable transformer ST is designed such that the core thereof can be saturated when charging 210808~
the second condenser Cl is finished.
According to the fourth embodiment, problems caused by switch timing upset can be avoided by location of respective pulse transformer against corresponding semiconductor switch. Furthermore, because the circuit is connected in series at the secondary area of the saturable transformer ST, pulse having high voltage and large amount of current can be generated from the circuit.
According to the present invention, pulse voltage generated by the semiconductor switch SW and the first condenser CO can be raised by location of the voltage raising transformer T or the pulse transformer PT
or the saturable transformer ST. The raised voltage is 15 compressed by the saturable transformer ST having smaller turns number of secondary winding to obtain short pulse.
Therefore, control voltage of the primary step switch can be decreased by the raised voltage of the transformer.
Then voltage load on the semiconductor switch can also be 20 reduced. Therefore, connection steps of the semiconductor switch devices can be minimized. Thus, the switch circuit and the adjacent circuit thereof can be simplified and minimized.
Additionally, the pulse voltage raised by the 25 transformer is compressed by the saturable transformer.
Therefore, voltage raising ratio of the saturable transformer and turns number of the secondary winding can be minimized. Thus, the core volume of the saturable transformer can be reduced to allow minimization of the 30 saturable transformer.
While the present invention has been disclosed in terms of the preferred embodiment in order to facilitate better understanding of the invention, it 2108(~80 should be appreciated that the invention can be embodied in various ways without depending from the principle of the invention. Therefore, the invention should be understood to include all possible embodiments and 5 modification to the shown embodiments which can be embodied without departing from the principle of the inventions as set forth in the appended claims.
Claims (14)
1. A pulse generator comprising:
switch means for switching a supply of a first current through a circuit, a first condenser serially connected to said switch means and charged by said first current, voltage raising means for obtaining a voltage output by said first current, said voltage raising means having a primary winding and a secondary winding, said primary winding being serially connected to said first condenser, magnetic switch means for switching current flow, said magnetic switch means having a primary winding and a secondary winding, said primary winding being serially connected to said secondary winding of said voltage raising means, a second condenser connected to said secondary winding of said magnetic switch means and charged by an output therefrom, and discharging means for generating a pulse discharge, said discharging means being connected to said second condenser to generate a pulse discharge when a charged voltage of said second condenser is applied thereto by switching said magnetic switch means.
switch means for switching a supply of a first current through a circuit, a first condenser serially connected to said switch means and charged by said first current, voltage raising means for obtaining a voltage output by said first current, said voltage raising means having a primary winding and a secondary winding, said primary winding being serially connected to said first condenser, magnetic switch means for switching current flow, said magnetic switch means having a primary winding and a secondary winding, said primary winding being serially connected to said secondary winding of said voltage raising means, a second condenser connected to said secondary winding of said magnetic switch means and charged by an output therefrom, and discharging means for generating a pulse discharge, said discharging means being connected to said second condenser to generate a pulse discharge when a charged voltage of said second condenser is applied thereto by switching said magnetic switch means.
2. A pulse generator as set forth in claim 1, wherein said switch means is formed of a plurality of semiconductor switches connected serially.
3. A pulse generator as set forth in claim 1, wherein said switch means is formed of a plurality of semiconductor switches connected in parallel.
4. A pulse generator as set forth in claim 1, wherein said primary and secondary windings of said voltage raising means are wound at a turns ratio such that a high voltage raising ratio is obtainable.
5. A pulse generator as set forth in claim 2, wherein said voltage raising means is a voltage raising transformer.
6. A pulse generator as set forth in claim 3, wherein said voltage raising means includes a plurality of pulse transformers corresponding to said semiconductor switches respectively.
7. A pulse generator as set forth in claim 3, wherein said voltage raising means includes a plurality of saturable transformers corresponding to said semiconductor switches respectively.
8. A pulse generator as set forth in claim 1, wherein said magnetic switch means is a saturable transformer.
9. A pulse generator as set forth in claim 1, wherein said magnetic switch means further includes a core which is saturable when said second condenser is completely charged.
10. A pulse generator as set forth in claim 1, wherein a number of turns of said secondary winding of the magnetic switch means is reduced to reduce voltage raising ratio thereat.
11. A pulse generator as recited in claim 1, wherein said switch means comprises:
a magnetic assistant circuit; and a semiconductor switch coupled serially with said magnetic assistant circuit.
a magnetic assistant circuit; and a semiconductor switch coupled serially with said magnetic assistant circuit.
12. A pulse generator as recited in claim 11, wherein said magnetic assistant circuit comprises a saturable reactor.
13. A pulse generator, comprising:
a) semiconductor switching means, having at least one semiconductor switching device, for operatively turning on a first current;
b) first charging means connected to said semiconductor switching means and into which the first current is supplied;
c) a voltage boosting transformer having a primary winding connected to said first charging means and a secondary winding across which a boosted voltage is generated, wherein a boosted voltage value is determined according to a winding ratio of said voltage boosting transformer and according to a value of the first current;
d) magnetic switch means having a saturable transformer, said saturable transformer having a primary winding and a secondary winding thereof, said primary winding of said magnetic switch means being connected to the secondary winding of said voltage boosting transformer;
e) second charging means connected to the secondary winding of said magnetic switch means for charging a voltage across the secondary winding of said magnetic switch means; and f) discharging means connected to said second charging means for generating a pulse discharge thereacross when the charged voltage in said second charging means is applied thereto according to a magnetic switching action of said magnetic switch means.
a) semiconductor switching means, having at least one semiconductor switching device, for operatively turning on a first current;
b) first charging means connected to said semiconductor switching means and into which the first current is supplied;
c) a voltage boosting transformer having a primary winding connected to said first charging means and a secondary winding across which a boosted voltage is generated, wherein a boosted voltage value is determined according to a winding ratio of said voltage boosting transformer and according to a value of the first current;
d) magnetic switch means having a saturable transformer, said saturable transformer having a primary winding and a secondary winding thereof, said primary winding of said magnetic switch means being connected to the secondary winding of said voltage boosting transformer;
e) second charging means connected to the secondary winding of said magnetic switch means for charging a voltage across the secondary winding of said magnetic switch means; and f) discharging means connected to said second charging means for generating a pulse discharge thereacross when the charged voltage in said second charging means is applied thereto according to a magnetic switching action of said magnetic switch means.
14. A pulse generator, comprising:
a first switch circuit to switch the supply of a first current through a circuit;
a first charging circuit coupled to said first switch circuit and charged by said first current;
a voltage boosting circuit coupled to said first charging circuit to provide a boosted voltage;
a reversible switch circuit couled to said voltage boosting circuit to supply a second current flowing in a first direction and having a switching action to allow a third current to flow in a second direction opposite to said first direction;
a second charging circuit coupled to said reversible switch circuit and charged by said second current to supply said third current upon said switching action of said reversible switch circuit; and a discharge circuit coupled to said second charging circuit and charged by said third current to generate a pulse discharge across said discharge circuit.
a first switch circuit to switch the supply of a first current through a circuit;
a first charging circuit coupled to said first switch circuit and charged by said first current;
a voltage boosting circuit coupled to said first charging circuit to provide a boosted voltage;
a reversible switch circuit couled to said voltage boosting circuit to supply a second current flowing in a first direction and having a switching action to allow a third current to flow in a second direction opposite to said first direction;
a second charging circuit coupled to said reversible switch circuit and charged by said second current to supply said third current upon said switching action of said reversible switch circuit; and a discharge circuit coupled to said second charging circuit and charged by said third current to generate a pulse discharge across said discharge circuit.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4-271253 | 1992-10-09 | ||
| JP27125392A JP3318981B2 (en) | 1992-10-09 | 1992-10-09 | Pulse power |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2108080A1 CA2108080A1 (en) | 1994-04-10 |
| CA2108080C true CA2108080C (en) | 1998-06-16 |
Family
ID=17497498
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002108080A Expired - Fee Related CA2108080C (en) | 1992-10-09 | 1993-10-08 | Pulse generator |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5514918A (en) |
| JP (1) | JP3318981B2 (en) |
| CA (1) | CA2108080C (en) |
| DE (1) | DE4334429C2 (en) |
Families Citing this family (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT404194B (en) * | 1995-10-30 | 1998-09-25 | Ruebig Ges M B H & Co Kg | DEVICE FOR SUPPLYING A CONSUMER WITH A PULSED ELECTRICAL VOLTAGE, ESPECIALLY FOR TREATING A WORKPIECE IN A GAS DISCHARGE |
| US5914974A (en) * | 1997-02-21 | 1999-06-22 | Cymer, Inc. | Method and apparatus for eliminating reflected energy due to stage mismatch in nonlinear magnetic compression modules |
| DE19708257A1 (en) * | 1997-02-28 | 1998-09-03 | Kriwan Ind Elektronik Gmbh | Vibration sensor |
| US5936988A (en) * | 1997-12-15 | 1999-08-10 | Cymer, Inc. | High pulse rate pulse power system |
| US5940421A (en) * | 1997-12-15 | 1999-08-17 | Cymer, Inc. | Current reversal prevention circuit for a pulsed gas discharge laser |
| US6151346A (en) * | 1997-12-15 | 2000-11-21 | Cymer, Inc. | High pulse rate pulse power system with fast rise time and low current |
| US6327286B1 (en) | 1998-04-27 | 2001-12-04 | Cymer, Inc. | High speed magnetic modulator voltage and temperature timing compensation circuit |
| US6016325A (en) * | 1998-04-27 | 2000-01-18 | Cymer, Inc. | Magnetic modulator voltage and temperature timing compensation circuit |
| US5949806A (en) * | 1998-06-19 | 1999-09-07 | Cymer, Inc. | High voltage cable interlock circuit |
| KR100276019B1 (en) | 1998-06-23 | 2000-12-15 | 윤문수 | High voltage power supply for magnetron |
| US6442181B1 (en) | 1998-07-18 | 2002-08-27 | Cymer, Inc. | Extreme repetition rate gas discharge laser |
| US6477193B2 (en) * | 1998-07-18 | 2002-11-05 | Cymer, Inc. | Extreme repetition rate gas discharge laser with improved blower motor |
| US6618421B2 (en) * | 1998-07-18 | 2003-09-09 | Cymer, Inc. | High repetition rate gas discharge laser with precise pulse timing control |
| KR100276020B1 (en) | 1998-08-19 | 2001-01-15 | 윤문수 | High pressure pulse generator using nonlinear capacitor |
| DE19838051A1 (en) * | 1998-08-21 | 2000-02-24 | Werner Arnold | Electronic circuit for generating current or voltage pulses, such as ignition sparks for internal combustion engines, with storage capacitors |
| JP3811681B2 (en) | 2002-06-12 | 2006-08-23 | 日本碍子株式会社 | High voltage pulse generator |
| GB2407659A (en) * | 2003-10-31 | 2005-05-04 | Hewlett Packard Development Co | Disaster recovery using multiple boot images held on a sequential storage device |
| JP4418212B2 (en) | 2003-11-21 | 2010-02-17 | 日本碍子株式会社 | High voltage pulse generator |
| JP4538305B2 (en) * | 2004-12-07 | 2010-09-08 | 日本碍子株式会社 | Discharge device |
| US20070242492A1 (en) * | 2006-04-18 | 2007-10-18 | Ngk Insulators, Ltd. | Pulse generator circuit |
| JP2011006284A (en) * | 2009-06-25 | 2011-01-13 | Toyota Motor Corp | Ozonizer |
| CN111416522B (en) * | 2020-04-05 | 2021-05-18 | 华中科技大学 | Novel DSRD pulse power circuit |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57212512A (en) * | 1981-06-25 | 1982-12-27 | Toshiba Corp | Voltage resonance type high-frequency switching circuit |
| US4612455A (en) * | 1984-05-10 | 1986-09-16 | The United States Of America As Represented By The Secretary Of The Army | Distributed pulse forming network for magnetic modulator |
| JPH0680611B2 (en) * | 1987-10-23 | 1994-10-12 | 日立金属株式会社 | Magnetic core |
| US4833431A (en) * | 1988-02-18 | 1989-05-23 | Mcdonnell Douglas Corporation | Triple-resonance pulse transformer circuit |
| FR2628270B1 (en) * | 1988-03-07 | 1994-03-04 | Commissariat A Energie Atomique | SATURABLE INDUCTANCE TYPE ELECTRIC PULSE GENERATOR |
| JPH0316189A (en) * | 1989-03-30 | 1991-01-24 | Hitachi Metals Ltd | High voltage pulse generator circuit, discharge pumping laser using same and accelerator |
| DE4029989A1 (en) * | 1990-09-21 | 1992-03-26 | Siemens Ag | High power pulse generator of low impedance - has charge capacitance of partial capacitors, each with separate trigger switch in series |
| DE4030184A1 (en) * | 1990-09-24 | 1992-03-26 | Siemens Ag | High power pulse generator with low impedance - has two charge capacitors in LC inversion circuit charged from HV source and discharged by trigger circuit |
| JP2647598B2 (en) * | 1992-03-27 | 1997-08-27 | 動力炉・核燃料開発事業団 | Laser system output control method |
-
1992
- 1992-10-09 JP JP27125392A patent/JP3318981B2/en not_active Expired - Fee Related
-
1993
- 1993-10-08 US US08/133,247 patent/US5514918A/en not_active Expired - Lifetime
- 1993-10-08 CA CA002108080A patent/CA2108080C/en not_active Expired - Fee Related
- 1993-10-08 DE DE4334429A patent/DE4334429C2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE4334429C2 (en) | 1995-03-09 |
| US5514918A (en) | 1996-05-07 |
| JP3318981B2 (en) | 2002-08-26 |
| CA2108080A1 (en) | 1994-04-10 |
| JPH06120783A (en) | 1994-04-28 |
| DE4334429A1 (en) | 1994-04-14 |
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