CN100588062C - Control and protective circuit on control and protective switch electric apparatus - Google Patents
Control and protective circuit on control and protective switch electric apparatus Download PDFInfo
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- CN100588062C CN100588062C CN200810019131A CN200810019131A CN100588062C CN 100588062 C CN100588062 C CN 100588062C CN 200810019131 A CN200810019131 A CN 200810019131A CN 200810019131 A CN200810019131 A CN 200810019131A CN 100588062 C CN100588062 C CN 100588062C
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Abstract
A control and protection circuit of a control and protection switching device pertains to the technical field of electric industry. The invention includes a signal sampling circuit, a short-circuit detection circuit, a microprocessor circuit, a magnetic flux converter control circuit and a power converting circuit; the signal sampling circuit sends a current signal to the microprocessor circuit after the amplification and the potential uplifting, the short-circuit detection circuit sends a large range signal in the signal sampling circuit to the microprocessor circuit after the processing, themicroprocessor circuit judges whether the short-circuit fault is existed or not, a corresponding control signal is given out and sent to the magnetic flux converter control circuit, the magnetic fluxconverter control circuit converts the low-level signal which is emitted by the microprocessor circuit to a high-level signal by photoelectric isolation, a magnetic flux converter is driven, the power conversion circuit converts the alternating current high voltage to the direct current low voltage, so as to provide the power for the circuits. The circuit transfer method is simple, the structureis simple, the reliability of the actions is good, the anti-interference capacity is strong, and the invention has the advantages of small size and high reliability when the invention is used for thecontrol and protection switching device.
Description
Technical field
The present invention relates to control control and protective circuit with protection switch electrical equipment, it does to use in low-voltage distribution and the control system, belongs to electrical technology field.
Background technology
Control well combines together with the function of protection switch electrical equipment with circuit breaker, contactor, thermal relay and isolator; reasonably carried out the co-ordination that each discrete component protective feature, control characteristic cooperate; the occasions such as control system that can be widely used in automation centralized control system and Fieldbus Based distributed production line, for example electrical control and protection systems such as the illumination in the Motor Control in fields such as metallurgy, colliery, iron and steel, petrochemical industry, harbour, boats and ships, railway and protection system and the modern architecture, power source conversion, pump, blower fan, air-conditioning.
Present stage research and discussion control have very important social effect with protection switch electrical equipment.
The multifunctional circuit of a kind of control and protection switch electrical equipment is disclosed among the Chinese patent literature CN 1996695A (open day is on July 11st, 2007), its signal transfer mode is: signal processing circuit (1) is handled current sampling signal, carries out signal and amplifies and the current potential lifting; Microcontroller circuit (2) carries out analog quantity to digital quantity conversion, the time and digital quantity signal is carried out operational analysis, judge fault, and provide corresponding output action that the reception of carrying out communication packet simultaneously sends; Short-circuit detecting circuit (3) judges that by the processing to input current signal whether short trouble takes place, and provides the corresponding actions signal; Output driving circuit (4) converts low level signal to high level signal, thereby drives the magnetic flux conversion element; Power-switching circuit (5) converts ac high voltage to DC low-voltage, thereby provides power supply to foregoing circuit, and it as shown in Figure 2.This transfer mode is than more complicated, circuit structure more complicated.
Also disclosing signal processing circuit among the Chinese patent literature CN 1996695A is by analog switch switch-over control signal magnification ratio, makes signal carry out analog quantity and obtain best magnification ratio before the digital quantity conversion.There is the discontinuity problem of current detecting in sort circuit, and certainty of measurement is poor, and measuring range is little.Short-circuit detecting circuit in the patent documentation carries out passing through with the relatively generation of decidable short trouble of threshold voltage after the rectification to current wave, and can export by time-delay.The reliable in action of this short-circuit detecting circuit is poor, slow in one's movements and poor anti jamming capability.Drive circuit in the patent documentation is arranged again, convert little current signal to big current signal, thereby drive the magnetic flux conversion element.The power supply of the microprocessor in the sort circuit and the power supply of magnetic flow convertor are not isolated, poor, the poor anti jamming capability of functional reliability.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art; control and the protective circuit of a kind of control with protection switch electrical equipment are provided; its circuit transfer mode is brief; circuit structure is simple; reliable in action is good and antijamming capability is strong; use control with protection switch electrical equipment in the time, volume is little, the reliability height.
The objective of the invention is to finish like this, the control and the protective circuit of a kind of control and protection switch electrical equipment is characterized in that comprising signal sample circuit, short-circuit detecting circuit, microcontroller circuit, magnetic flow convertor control circuit, power-switching circuit; Signal sample circuit current signal is amplified and the current potential lifting after send into microcontroller circuit, short-circuit detecting circuit is given microcontroller circuit after the current sampling circuit wide range signal in the signal sample circuit is handled, judge whether the fault that is short-circuited by microcontroller circuit, provide control signal corresponding and deliver to the magnetic flow convertor control circuit, the low level signal that the magnetic flow convertor control circuit sends microcontroller circuit through light every converting high level signal to, thereby driving magnetic flow convertor, power-switching circuit converts ac high voltage to DC low-voltage, thereby is signal sample circuit, short-circuit detecting circuit, microcontroller circuit, the magnetic flow convertor control circuit provides power supply.
Microcontroller circuit of the present invention is by microprocessor U1, crystal oscillator CT, chip IC2 resets, second capacitor C 2, the 3rd capacitor C 3 is formed, crystal oscillator CT one end is connected with an end of second capacitor C 2 and 12 pin of microprocessor U1, the other end of crystal oscillator CT is connected with an end of the 3rd capacitor C 3 and 10 pin of microprocessor U1, ground connection after the other end of second capacitor C 2 is connected with the other end of the 3rd capacitor C 3,2 pin of chip IC2 of resetting are connected with 6 pin of microprocessor U1,13 pin of microprocessor U1,78 pin, 3 pin of chip IC2 of resetting meet DC power supply VCC, 69 of microprocessor U1,70,71,73,74,76 pin are connected with signal sample circuit, 77 of microprocessor U1,39,17 pin respectively with reference power supply Vref, the magnetic flow convertor control circuit, short-circuit detecting circuit connects, 11 pin of microprocessor U1,75 pin, the 1 pin ground connection of chip IC2 resets.
Microprocessor U1 in the microcontroller circuit of the present invention adopts and carries the A/D change-over circuit, and input/output port 16 single-chip microcomputers how are as microprocessor.
Signal sample circuit of the present invention is by first resistance R 1, second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7, first capacitor C 1, operational amplifier IC1 forms, first resistance R 1 is in parallel with current transformer I-A, one end of first resistance R 1 and first capacitor C 1, one end of second resistance R 2 connects, the other end of second resistance R 2 is connected with 3 pin of operational amplifier IC1, the other end of the other end of first resistance R 1 and first capacitor C 1, one end of the 4th resistance R 4, reference voltage COM connects, one end of the other end of the 4th resistance R 4 and the 6th resistance R 6,6 pin of operational amplifier IC1 connect, one end of the other end of the 6th resistance R 6 and the 7th resistance R 7,7 pin of operational amplifier IC1 connect, 2 pin of operational amplifier IC1 are connected back and the 5th resistance R 5 with 1 pin, one end of the 3rd resistance R 3 connects, the other end of the 3rd resistance R 3 is connected with 5 pin of operational amplifier IC1, the 5th resistance R 5, the other end of the 7th resistance R 7 respectively with 71 pin of microprocessor U1,76 pin connect, the 11 pin ground connection of operational amplifier IC1,4 pin of operational amplifier IC1 meet DC power supply VCC.
Short-circuit detecting circuit of the present invention is by the 8th resistance R 8, the 9th resistance R 9, the tenth R10, voltage comparator ic 3, the 4th capacitor C 4, the 5th capacitor C 5, the first diode D1, the second diode D2, first or the door U2, second or door U3 form, the 8th resistance R 8 one ends are connected with the other end and 71 pin microprocessor U1 of signal sample circuit the 5th resistance R 5,3 pin of the other end of the 8th resistance R 8 and voltage comparator ic 3,6 pin connect, 2 pin of voltage comparator ic 3 connect limit threshold voltage Vref1, one end of one end of the 9th resistance R 9 and the 4th capacitor C 4, the anode of the first diode D1,1 pin of voltage comparator ic 3 connects, 5 pin of voltage comparator ic 3 meet lower limit threshold voltage Vref2, one end of one end of the tenth resistance R 10 and the 5th capacitor C 5, the anode of the second diode D2,7 pin of voltage comparator ic 3 connect, the first diode D1, the negative electrode of the second diode D2 with first or the door U2 1 pin be connected, first or 3 pin of door U2 be connected with second or 1 pin of U3, second or 3 pin of door U3 connect 17 pin of microprocessor U1,8 pin of voltage comparator ic 3, the 9th resistance R 9, another termination DC power supply VCC of the tenth resistance R 10,4 pin of voltage comparator ic 3, the 4th capacitor C 4, the other end ground connection of the 5th capacitor C 5.
Magnetic flow convertor control circuit 4 of the present invention is by the 11 resistance R 11, the 12 resistance R 12, the 13 resistance R 13, the 14 resistance R 14, the 6th capacitor C 6, the 7th capacitor C 7, the 8th capacitor C 8, optocoupler O1, the 3rd diode D3, the first triode Q1, the second triode Q2 forms, one end of one end of the 11 resistance R 11 and the 6th capacitor C 6, the 3rd diode D3 negative electrode, the end of magnetic flow convertor KM connects, the anode of the collector electrode of the first triode Q1 and the 3rd diode D3, the collector electrode of the second triode Q2, the other end of magnetic flow convertor KM connects, the emitter of the first triode Q1 is connected with the base stage of the second triode Q2, the base stage of the first triode Q1 and the 8th capacitor C 8, one end of the 14 resistance R 14, the E pin of optocoupler O1 connects, one end of the 12 resistance R 12 is connected with the C pin of optocoupler O1, the 12 resistance R 12, another termination power vd D of the 11 resistance R 11, one end of one end of the 13 resistance R 13 and the 7th capacitor C 7, the A pin of optocoupler O1 connects, the other end of the 7th capacitor C 7 and 39 pin that are connected to microprocessor U1 after the K pin of optocoupler O1 is connected, another termination DC power supply VCC of the 13 resistance R 13, the emitter of the second triode Q2 and the 6th capacitor C 6, the 8th capacitor C 8, the other end ground connection of the 14 resistance R 14.
The present invention is owing to adopted foregoing circuit, and circuit transfer mode is brief, and circuit structure is simple, and reliable in action is good and antijamming capability is strong, uses that to have volume in control and protection switch electrical equipment little, the advantage that reliability is high.
Description of drawings
Fig. 1 is control and the protective circuit theory diagram of control with protection switch electrical equipment.
Fig. 2 is the theory diagram of former control and protection switch appliance circuit hardware.
Fig. 3 is the schematic diagram of signal sample circuit and microcontroller circuit.
Fig. 4 is the schematic diagram of short-circuit detecting circuit.
Fig. 5 is the schematic diagram of magnetic flow convertor control circuit.
Fig. 6 is the schematic diagram of power-switching circuit.
Embodiment
By the description of applicant, will help to understand the present invention more, and good effect of the present invention is embodied more, but embodiment should not be considered as the restriction to some extent to the present invention program embodiment.
See also Fig. 1 schematic block circuit diagram of the present invention.Signal sample circuit 2 current signal is amplified and the current potential lifting after send into microcontroller circuit 1, after handling, current sampling circuit wide range signal in 3 pairs of signal sample circuits 2 of short-circuit detecting circuit gives microcontroller circuit 1, judge whether the fault that is short-circuited by microcontroller circuit 1, provide control signal corresponding and deliver to magnetic flow convertor control circuit 4, the low level signal that magnetic flow convertor control circuit 4 sends micro-processor interface circuit through light every converting high level signal to, thereby drive magnetic flow convertor KM, power-switching circuit 5 converts ac high voltage to DC low-voltage, thereby provides power supply for other circuit.
See also Fig. 3 signal sample circuit 2 and microcontroller circuit 1, the present invention adopts 16 single-chip microcomputers as microprocessor U1 (M16C28), its function is strong, carry the A/D change-over circuit, input/output port is many, therefore save the analog selection switching circuit, signal sample circuit 2 is to adopt two ranges of size to carry out current measurement, make the current signal analog quantity before the digital quantity conversion, obtain best magnification ratio, signal sample circuit 2 will be from current transformer I-A detection signal (the present invention is an example with A mutually), exchange sampling through first resistance R 1, carry out the current potential lifting by reference voltage COM and get current signal Ia, current signal Ia is earlier by second resistance R 2, operational amplifier IC1A (TLV2254A) follows, one the tunnel obtains wide range signal Iamax through the 5th resistance R 5, another road is through operational amplifier IC1B (TLV2254A), the 3rd resistance R 3, the 4th resistance R 4, the 6th resistance R 6, amplify and carry out the current potential lifting by reference voltage COM, obtain journey signal Iamin in a small amount through the 7th resistance R 7,71 pin and 76 pin with the microprocessor U1 of the signal input microprocessor circuit 1 of two ranges of size carry out the A/D conversion simultaneously, and microprocessor U1 carries out effective value calculating to it.Wherein IC2 (MAX809) is the chip that resets, and CT1 is a crystal oscillator, has cross section between the big or small range, has guaranteed the continuity of current sample, and microprocessor determines to adopt the value of which range to calculate according to conversion value, and certainty of measurement and scope are improved greatly.In like manner, wide range signal Ibmax, the Icmax of B phase, C phase be 70,69 pin of input microprocessor U1 respectively, in a small amount 74,73 pin of journey signal Ibmin, Icmain difference input microprocessor U1.
See also Fig. 4 short-circuit detecting circuit 3 of the present invention, wide range current signal and upper limit threshold voltage, the lower limit threshold voltage of short-circuit detecting circuit 3 number of winning the confidence sample circuits 2 relatively produce level signal to microcontroller circuit 1, by the generation of microcontroller circuit 1 by software filtering technology determination short trouble.With A is example mutually, with obtain in the signal sample circuit 2 wide range signal Iamax through the 8th resistance R 8 by voltage comparator ic 3A (LM293D) and upper limit threshold voltage Vref1, compare with lower limit threshold voltage Vref2.When electric current when positive half wave is short-circuited, current sampling signal Iamax greater than upper limit threshold voltage Vref1 through voltage comparator ic 3A, the 9th resistance R 9, the 4th capacitor C 4 and first diode D1 output high level signal Iaint; When electric current when negative half-wave is short-circuited, current sampling signal Iamax less than lower limit threshold voltage Vref2 through comparator IC3B, the tenth resistance R 10, the 5th capacitor C 5 and second diode D2 output high level signal Iaint, both be or relation, when satisfying arbitrary condition, export high level, B, C also is like this mutually, high level signal Iaint, Ibint, Ieint through first or the door U2, second or door obtain 17 pin that short-circuit signal Iint delivers to the microprocessor U1 of microcontroller circuit 1 behind the U3, by microprocessor U1 this short-circuit signal Iint is carried out judging whether to send out trip signal to magnetic flow convertor control circuit 4 behind the software filtering, this mode is owing to adopt microprocessor to come the design software filtering technique, therefore flexible software design makes things convenient for and has reduced electronic device, can satisfy the rapidity of action, can satisfy the high requirement of anti-interference again, and reliable in action is good.
Consult Fig. 5 magnetic flow convertor control circuit 4 of the present invention, magnetic flow convertor control circuit 4 sends the low level control signal with microcontroller circuit 1 and converts high level signal to through the isolation of light lotus root, thereby drives magnetic flow convertor.39 human hair combing wastes of microprocessor U1 go out low level signal TRIP, by optocoupler O1 little current signal are converted to big current signal, thereby drive magnetic flow convertor KM, and the power supply of magnetic flow convertor KM is powered by the 6th capacitor C 6, prevents the influence of big electric current to power vd D.13 metering functions of the 13 resistance R, the 7th capacitor C 7 strobe, and prevent optocoupler O1 false triggering.VDD provides a level signal to drive the Darlington output circuit of being made up of the first triode Q1, the second triode Q2 after the 12 resistance R the 12, the 14 resistance R 14 dividing potential drops, this moment, the 6th capacitor C 6 was discharged through magnetic flow convertor KM and Darlington output circuit, magnetic flow convertor KM action, the width of the time of discharge by the low level signal TRIP that microprocessor U1 sends decides.The 3rd diode D3 is the fly-wheel diode of magnetic flow convertor KM.Foregoing circuit is realized by optocoupler owing to the power supply of microprocessor and the isolated from power of magnetic flow convertor, has been improved the functional reliability of system.
Consult Fig. 6 power-switching circuit 5 of the present invention, AC power is converted to DC low-voltage VDD by the input of L, N end and by the AC/DC first conversion chip T1 (LD03) with ac high voltage, give the magnetic flow convertor control circuit 4 power supplies, DC low-voltage VDD converts lower supply voltage VCC to by the DC/DC second conversion chip T2 (PWB2405) again, gives other circuit supply.The 15 resistance R 15 is dummy load, the 9th capacitor C 9, the tenth capacitor C the 10, the 12 capacitor C the 12, the 13 capacitor C the 13, the 14 capacitor C the 14, the 15 capacitor C the 15, the 16 capacitor C 16, the first magnetic bead L1, the second magnetic bead L2, inductance L 3 all strobes.Supply voltage VCC is through high accuracy voltage stabilizing chip IC 4 (MAX6104) output reference power supply Vref, reference power supply Vref makes the reference voltage that microprocessor U1 carries out the A/D conversion, and reference power supply Vref obtains upper limit threshold voltage Vref1, lower limit threshold voltage Vref2 after high accuracy the 16 resistance R the 16, the 18 resistance R the 18, the 17 resistance R the 17, the 19 resistance R 19 dividing potential drops.Reference voltage COM is used for the current transformer signal is carried out lifting, this voltage is by high accuracy voltage stabilizing chip IC 6 (REF3020) output reference power supply Vref3 and through voltage follower circuit IC5A (LM258) output reference voltage COM, and the 20 resistance R the 20, the 17 capacitor C the 17, the 18 capacitor C the 18, the 19 capacitor C 19 strobes.
The present invention is owing to adopted foregoing circuit, and circuit transfer mode is brief, and circuit structure is simple, and reliable in action is good and antijamming capability is strong, uses that to have volume in control and protection switch electrical equipment little, the advantage that reliability is high.
Claims (5)
1, the control and the protective circuit of a kind of control and protection switch electrical equipment comprise signal sample circuit, short-circuit detecting circuit, microcontroller circuit, magnetic flow convertor control circuit, power-switching circuit; Signal sample circuit current signal is amplified and the current potential lifting after send into microcontroller circuit, short-circuit detecting circuit is given microcontroller circuit after the current sampling circuit wide range signal in the signal sample circuit is handled, judge whether the fault that is short-circuited by microcontroller circuit, provide control signal corresponding and deliver to the magnetic flow convertor control circuit, the low level signal that the magnetic flow convertor control circuit sends microcontroller circuit through light every converting high level signal to, thereby driving magnetic flow convertor, power-switching circuit converts ac high voltage to DC low-voltage, thereby be signal sample circuit, short-circuit detecting circuit, microcontroller circuit, the magnetic flow convertor control circuit provides power supply, it is characterized in that described microcontroller circuit is by microprocessor (U1), crystal oscillator (CT), chip (IC2) resets, second electric capacity (C2), the 3rd electric capacity (C3) is formed, crystal oscillator (CT) end is connected with an end of second electric capacity (C2) and 12 pin of microprocessor (U1), the other end of crystal oscillator (CT) is connected with an end of the 3rd electric capacity (C3) and 10 pin of microprocessor (U1), ground connection after the other end of second electric capacity (C2) is connected with the other end of the 3rd electric capacity (C3), 2 pin of chip (IC2) of resetting are connected with 6 pin of microprocessor (U1), 13 pin of microprocessor (U1), 78 pin, 3 pin of chip (IC2) of resetting connect DC power supply (VCC), 69 of microprocessor (U1), 70,71,73,74,76 pin are connected with signal sample circuit, 77 of microprocessor (U1), 39,17 pin respectively with reference power supply (Vref), the magnetic flow convertor control circuit, short-circuit detecting circuit connects, 11 pin of microprocessor (U1), 75 pin, 1 pin ground connection of chip (IC2) resets.
2, the control and the protective circuit of control according to claim 1 and protection switch electrical equipment; it is characterized in that microprocessor (U1) employing in the described microcontroller circuit carries the A/D change-over circuit, input/output port 16 single-chip microcomputers how are as microprocessor.
3; the control of control according to claim 1 and protection switch electrical equipment and protective circuit; it is characterized in that described signal sample circuit is by first resistance (R1); second resistance (R2); the 3rd resistance (R3); the 4th resistance (R4); the 5th resistance (R5); the 6th resistance (R6); the 7th resistance (R7); first electric capacity (C1); operational amplifier (IC1) is formed; first resistance (R1) is in parallel with current transformer (I-A); one end of first resistance (R1) and first electric capacity (C1); one end of second resistance (R2) connects; the other end of second resistance (R2) is connected with 3 pin of operational amplifier (IC1); the other end of the other end of first resistance (R1) and first electric capacity (C1); one end of the 4th resistance (R4); reference voltage (COM) connects; one end of the other end of the 4th resistance (R4) and the 6th resistance (R6); 6 pin of operational amplifier (IC1) connect; one end of the other end of the 6th resistance (R6) and the 7th resistance (R7); 7 pin of operational amplifier (IC1) connect; 2 pin of operational amplifier (IC1) are connected back and the 5th resistance (R5) with 1 pin; one end of the 3rd resistance (R3) connects; the other end of the 3rd resistance (R3) is connected with 5 pin of operational amplifier (IC1); the 5th resistance (R5); the other end of the 7th resistance (R7) respectively with 71 pin of microprocessor (U1); 76 pin connect; 11 pin ground connection of operational amplifier (IC1), 4 pin of operational amplifier (IC1) connect DC power supply (VCC).
4; the control of control according to claim 1 and protection switch electrical equipment and protective circuit; it is characterized in that described short-circuit detecting circuit is by the 8th resistance (R8); the 9th resistance (R9); the tenth resistance (R10); voltage comparator (IC3); the 4th electric capacity (C4); the 5th electric capacity (C5); first diode (D1); second diode (D2); first or the door (U2); second or door (U3) form; the 8th resistance (R8) end is connected with the other end of signal sample circuit the 5th resistance (R5) and 71 pin of microprocessor (U1); 3 pin of the other end of the 8th resistance (R8) and voltage comparator (IC3); 6 pin connect; 2 pin of voltage comparator (IC3) connect limit threshold voltage (Vref1); one end of one end of the 9th resistance (R9) and the 4th electric capacity (C4); the anode of first diode (D1); 1 pin of voltage comparator (IC3) connects; 5 pin of voltage comparator (IC3) connect lower limit threshold voltage (Vref2); one end of one end of the tenth resistance (R10) and the 5th electric capacity (C5); the anode of second diode (D2); 7 pin of voltage comparator (IC3) connect; first diode (D1); the negative electrode of second diode (D2) with first or the door (U2) 1 pin be connected; first or 3 pin of door (U2) be connected with second or 1 pin of (U3); second or 3 pin of door (U3) connect 17 pin of microprocessor (U1); 8 pin of voltage comparator (IC3); the 9th resistance (R9); another termination DC power supply (VCC) of the tenth resistance (R10), 4 pin of voltage comparator (IC3); the 4th electric capacity (C4); the other end ground connection of the 5th electric capacity (C5).
5; the control of control according to claim 1 and protection switch electrical equipment and protective circuit; it is characterized in that described magnetic flow convertor control circuit (4) is by the 11 resistance (R11); the 12 resistance (R12); the 13 resistance (R13); the 14 resistance (R14); the 6th electric capacity (C6); the 7th electric capacity (C7); the 8th electric capacity (C8); optocoupler (O1); the 3rd diode (D3); first triode (Q1); second triode (Q2) is formed; one end of one end of the 11 resistance (R11) and the 6th electric capacity (C6); the 3rd diode (D3) negative electrode; one end of magnetic flow convertor (KM) connects; the anode of the collector electrode of first triode (Q1) and the 3rd diode (D3); the collector electrode of second triode (Q2); the other end of magnetic flow convertor (KM) connects; the emitter of first triode (Q1) is connected with the base stage of second triode (Q2); the base stage of first triode (Q1) and the 8th electric capacity (C8); one end of the 14 resistance (R14); the E pin of optocoupler (O1) connects; one end of the 12 resistance (R12) is connected with the C pin of optocoupler (O1); the 12 resistance (R12); another termination power (VDD) of the 11 resistance (R11); one end of one end of the 13 resistance (R13) and the 7th electric capacity (C7); the A pin of optocoupler (O1) connects; the other end of the 7th electric capacity (C7) and 39 pin that are connected to microprocessor (U1) after the K pin of optocoupler (O1) is connected; another termination DC power supply (VCC) of the 13 resistance (R13), the emitter of second triode (Q2) and the 6th electric capacity (C6); the 8th electric capacity (C8); the other end ground connection of the 14 resistance (R14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN200810019131A CN100588062C (en) | 2008-01-14 | 2008-01-14 | Control and protective circuit on control and protective switch electric apparatus |
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| CN200810019131A CN100588062C (en) | 2008-01-14 | 2008-01-14 | Control and protective circuit on control and protective switch electric apparatus |
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| CN101217231A CN101217231A (en) | 2008-07-09 |
| CN100588062C true CN100588062C (en) | 2010-02-03 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101902034B (en) * | 2009-05-25 | 2013-05-22 | 苏州万龙电气集团股份有限公司 | Short-circuit protection device for switching device |
| CN101924343B (en) * | 2010-08-20 | 2012-12-12 | 上海电科电器科技有限公司 | Multifunctional circuit for controlling and protecting switching apparatus |
| CN102570377B (en) * | 2010-12-07 | 2016-06-08 | 中国第一汽车集团公司无锡油泵油嘴研究所 | Load faulty diagnosis detecting method and device |
| CN102957142B (en) * | 2011-08-18 | 2016-03-16 | 安徽皖科电子工程有限公司 | Based on the Fieldbus Intelligent distributor of IEC61158-2 transmission technology |
| CN102445587B (en) * | 2011-11-18 | 2017-07-11 | 华东电力试验研究院有限公司 | Current sampling circuit and its current range determination device |
| CN103390877B (en) * | 2013-08-07 | 2016-12-28 | 北京经纬恒润科技有限公司 | A kind of over-current detection and protection circuit |
| CN104423515B (en) * | 2013-08-23 | 2019-02-22 | 深圳市海洋王照明工程有限公司 | A kind of low-level reset circuit |
| CN107192963A (en) * | 2017-06-22 | 2017-09-22 | 天津七六四通信导航技术有限公司 | A kind of circuit and implementation method that function is detected with short interruption |
| CN108768354B (en) * | 2018-07-20 | 2023-08-25 | 佛山科学技术学院 | Three-potential double-limit comparison circuit |
| CN111596224B (en) * | 2020-06-15 | 2022-06-28 | 浙江中医药大学附属第三医院 | Percutaneous/percutaneous needle electrical stimulation output short circuit detection method |
| CN112630524A (en) * | 2021-03-05 | 2021-04-09 | 江苏瑞电智芯信息科技有限公司 | Low-current signal acquisition processing circuit and acquisition processing method |
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