CN103325633B - Electromagnetic type undervoltage release - Google Patents
Electromagnetic type undervoltage release Download PDFInfo
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- CN103325633B CN103325633B CN201310168059.7A CN201310168059A CN103325633B CN 103325633 B CN103325633 B CN 103325633B CN 201310168059 A CN201310168059 A CN 201310168059A CN 103325633 B CN103325633 B CN 103325633B
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Abstract
The invention provides an electromagnetic type undervoltage release which comprises an EMC circuit, a full-wave rectifying circuit, a power circuit, a comparison circuit, a trough circuit, a driving circuit, a switching circuit and an electromagnet, wherein the EMC circuit is used for restraining interference signals in a double-direction mode, and the interference signals are from a power grid and are generated by an interior circuit. The positive output end of the full-wave rectifying circuit is connected with the power circuit, the comparison circuit, the trough circuit and the electromagnet, the output end of the power circuit is connected with the comparison circuit, the trough circuit and the driving circuit, and the output end of the comparison circuit is connected into the trough circuit. The output end of the trough circuit is connected with the driving circuit, the output end of the driving circuit is connected with the switching circuit, and the output end of the switching circuit is connected with the electromagnet. The electromagnetic type undervoltage release is safe and reliable in control circuit, simple in structure and easy to achieve, the calorific value of a coil of the electromagnet is small, a power wave chopping device is small in wave chopping voltage, the generated electromagnetic interference is small, and the working efficiency is high.
Description
Technical field
The present invention relates to a kind of low tension switch control field, particularly relate to a kind of electromagnetic undervoltage release.
Background technology
Device for under-voltage releasing equipment is circuit breaker, especially one of the critical elements of frame-type circuit breaker.When voltage drop (even slowly declining), in 70% ~ 35% scope of rated operational voltage, device for under-voltage releasing equipment answers action; Supply voltage lower than rated operational voltage 35% time, device for under-voltage releasing equipment should be able to prevent breaker closing; When supply voltage is equal to, or greater than rated operational voltage 85%, circuit breaker normally closed should be able to be ensured, the essence of undervoltage tripping, be prevent circuit breaker subordinate electric equipment be operated in electric current under under-voltage condition excessive after, the effective measures that electric equipment self-heating increases the weight of.
Existing electromagnetic undervoltage release and magnet switching control appliance, the problem that ubiquity coil heating amount is high and control circuit is too complicated, control circuit often adopts the forms such as PWM, the lower operating voltage of an electromagnet is obtained by the means of copped wave, " copped wave " moment, when occurring in the peak value of input supply voltage, its copped wave amplitude is very large, and (power supply as 380V inputs, peak-peak is 537V), have a strong impact on the safety of chopped power device, and producing serious electromagnetic interference, control circuit reliability also obviously reduces.
Summary of the invention
The technical problem to be solved in the present invention is: have that coil heating amount is high, control circuit is complicated, efficiency is low and control circuit can produce serious electromagnetic interference to solve existing electromagnetic undervoltage release, affect the problem of device safety, the invention provides a kind of electromagnetic undervoltage release and adopt the control circuit comprising trough circuit to solve the problems referred to above.
The technical solution adopted for the present invention to solve the technical problems is: a kind of electromagnetic undervoltage release, comprise the EMC circuit of the interference signal produced from electrical network and internal circuit for two-way suppression, full-wave rectifying circuit, power circuit, comparison circuit, trough circuit, drive circuit, switching circuit and electromagnet, two input access line voltages of described EMC circuit, two outputs of described EMC circuit are connected with two inputs of full-wave rectifying circuit, the positive output end of described full-wave rectifying circuit and power circuit, comparison circuit, trough circuit is connected with electromagnet, the negative output terminal ground connection of described full-wave rectifying circuit, described power circuit output end and comparison circuit, trough circuit is connected with drive circuit, the output of described comparison circuit is linked into trough circuit, the output of described trough circuit is connected with drive circuit, the output of described drive circuit is connected with switching circuit, the output of described switching circuit is connected with electromagnet,
Described comparison circuit comprises for carrying out dividing potential drop to the output voltage of full-wave rectifying circuit and exporting the first sample circuit of the first electrical network sampled voltage and the reference circuit for carrying out dividing potential drop output reference voltage to the output voltage of power circuit output end, described comparison circuit also comprises and the first electrical network sampled voltage and reference voltage to be compared and to export the first comparator of the first level, described comparison circuit has hysteresis voltage, described trough circuit comprise for dividing potential drop is carried out to the output voltage of full-wave rectifying circuit and export the second electrical network sampled voltage the second sample circuit and for carrying out dividing potential drop to the first level and exporting the reference circuit of reference level, described trough circuit also comprises and the second electrical network sampled voltage and reference level to be compared and to export the second comparator of second electrical level, described drive circuit is used for second electrical level to carry out amplification and control switch circuit turn-on electromagnet.Waveform for the alternating voltage inputted from electrical network is sine wave, rectification through full-wave rectifying circuit becomes unidirectional pulsating wave, the pulsating wave of one-period has a trough, the magnitude of voltage of trough times is minimum, in order to obtain the lower operating voltage of an electromagnet, and make control circuit simple, reliably, the electromagnetic interference produced is little, second electrical network sampled voltage and reference level compare by the second comparator, when the second electrical network sampled voltage is less than reference level, second electrical level is carried out amplification and control switch circuit turn-on electromagnet by drive circuit, when the second electrical network sampled voltage is greater than reference level, drive circuit suspends control switch circuit, electromagnet enters of short duration power failure state, i.e. electromagnet reliably working in the low voltage range of the second electrical network sampled voltage trough both sides.
Because electromagnet only obtains electric work in the low voltage range of the second electrical network sampled voltage trough both sides, discontinuous by the electric current of electromagnet coil, noise can be produced, described electromagnet two ends are parallel with the 5th electric capacity for eliminating electromagnet noise, electromagnet obtain electric while, the 5th capacitor charging store electric charge, when electromagnet dead electricity, 5th electric capacity discharges to electromagnet, thus keeps the current continuity of electromagnet, improves the suction of electromagnet.
In order to the scope of the ratio of the approximately linear of the amplitude with electromagnet ON time of expanding line voltage further, also comprise off-centre circuit, described off-centre circuit comprises the first offset resistance and the second offset resistance, one end of described first offset resistance is connected with one end of the second offset resistance, described first other one end of offset resistance is connected with the output of the first sample circuit, other one end ground connection of described second offset resistance, draw offset voltage between described first offset resistance and the second offset resistance, described offset voltage is connected with reference circuit.
Described first comparator is operational amplifier, single-chip microcomputer or SOC (system on a chip), described second comparator is operational amplifier, single-chip microcomputer or SOC (system on a chip), first comparator and the second comparator realize the comparing function of comparison circuit and trough circuit respectively, or described first comparator and the second comparator are same two-way voltage comparator, two-way operational amplifier, single-chip microcomputer or SOC (system on a chip), first comparator and the second comparator unite two into one, and realize the comparing function of comparison circuit and trough circuit simultaneously.
Described EMC circuit comprises the first electric capacity, the second electric capacity and common mode inductance, and described first Capacitance parallel connection is at the two ends of common mode inductance, and described second Capacitance parallel connection is at the other two ends of common mode inductance, and this EMC circuit can also be the π type filter circuit of other form.
Described first sample circuit comprises the first resistance, second resistance, 3rd resistance and the second filter capacitor, the positive output end of described full-wave rectifying circuit, first resistance is connected successively with the second resistance, described second resistance other end ground connection, described second filter capacitor is connected in parallel on the two ends of the second resistance, described first electrical network sampled voltage is from drawing between the first resistance and the second resistance and being connected with one end of the 3rd resistance, the other end of described 3rd resistance is connected with the in-phase input end of the first comparator, described comparison circuit also comprises hysteresis resistance, described hysteresis resistance one end is connected with the in-phase input end of the first comparator, the other end is connected with the output of the first comparator, described reference circuit comprises the 5th resistance and the 6th resistance, described 5th resistance and the 6th resistant series, the other end of described 5th resistance is connected with power circuit output end, described 6th resistance other end ground connection, described reference voltage is from drawing between the 5th circuit and the 6th resistance and being connected with the inverting input of the first comparator, for the parameter set by electromagnetic undervoltage release, when line voltage >=n% rated operational voltage (0<n<100), first electrical network sampled voltage >=reference voltage, first level upset is high level, for reference circuit provides input voltage, hysteresis resistance is for improving the first electrical network sampled voltage, overcome the critical flutter of the first comparator, by the resistance of setting hysteresis resistance, realize when line voltage < m% rated operational voltage (0<m<n), first electrical network sampled voltage < reference voltage, first level upset is low level, first comparator resets, for next action is ready, now electromagnet is threaded off.
The connected mode of circuit during off-centre circuit is not had to be: described reference circuit comprises the 7th resistance and the 8th resistance, the output of described first comparator is connected with one end of the 7th resistance, other one end of described 7th resistance is connected with one end of the 8th resistance, other one end ground connection of described 8th resistance, described reference level is from drawing between the 7th resistance and the 8th resistance and being connected with the inverting input of the second comparator.
The connected mode with circuit during off-centre circuit is: described reference circuit comprises the 7th resistance and the 8th resistance, the output of described first comparator is connected with one end of the 7th resistance, other one end of described 7th resistance is connected with one end of the 8th resistance, other one end of described 8th resistance is connected with offset voltage, and described reference level is from drawing between the 7th resistance and the 8th resistance and being connected with the inverting input of the second comparator.
Described second sample circuit comprises the 9th resistance, second voltage stabilizing didoe, tenth resistance, the positive output end of described full-wave rectifying circuit, 9th resistance is connected successively with the tenth resistance, described tenth resistance other end ground connection, described second voltage stabilizing didoe is connected in parallel on the two ends of the tenth resistance, described second electrical network sampled voltage is from drawing between the 9th resistance and the tenth resistance and being connected with the in-phase input end of the second comparator, second voltage stabilizing didoe is used for amplitude limit, when the second electrical network sampled voltage < reference level, second electrical level is low level, when the second electrical network sampled voltage > reference level, second electrical level is high level, drive circuit is that low level drives, drive circuit also can be that high level drives, only the second electrical network sampled voltage need be accessed the inverting input of the second comparator, reference level access in-phase input end.
Drive circuit is the preferred electrical architecture that low level drives: described drive circuit comprises the 11 resistance, 12 resistance, 13 resistance, 14 resistance, 15 resistance, 3rd electric capacity, 4th electric capacity, second triode, 3rd triode, described switching circuit comprises metal-oxide-semiconductor, the output of described second comparator is connected with one end of the 11 resistance, other one end of described 11 resistance is connected with the base stage of the second triode, described 3rd Capacitance parallel connection is at the two ends of the 11 resistance, the emitter of described second triode is connected with power circuit output end, the collector electrode of described second triode is connected with one end of the 15 resistance, other one end of described 15 resistance is connected with the grid of metal-oxide-semiconductor, one end of described 12 resistance is connected with the base stage of the second triode, one end is connected with the emitter of the second triode in addition, the output of described second comparator is connected with one end of the 13 resistance, other one end of described 13 resistance is connected with the base stage of the 3rd triode, described 4th Capacitance parallel connection is at the two ends of the 13 resistance, the grounded emitter of described 3rd triode, the collector electrode of described 3rd triode is connected with the grid of metal-oxide-semiconductor, one end of described 14 resistance is connected with the base stage of the second triode, one end ground connection in addition, the source ground of described metal-oxide-semiconductor, drain electrode is connected with one end of electromagnet, other one end of described electromagnet is connected with the positive output end of full-wave rectifying circuit, described electromagnet two ends are also parallel with diode.
Power circuit comprises the first power rheostat, second power rheostat, first triode, first voltage stabilizing didoe and the first filter capacitor, the transmitting very power circuit output end of described first triode, described first power rheostat one end connects the positive output end of full-wave rectifying circuit, the other end is connected with the collector electrode of the first triode, described second power rheostat one end connects the positive output end of full-wave rectifying circuit, the other end is connected with the base stage of the first triode, the negative pole of described first voltage stabilizing didoe is connected with the base stage of the first triode, plus earth, the positive pole of described first filter capacitor is connected with the emitter of the first triode, minus earth, power circuit can also be other switch form, series connection step-down form or the circuit of PWM form.
The electromagnetic interference the invention has the beneficial effects as follows, the control circuit of this electromagnetic undervoltage release is safe and reliable, structure is simple and easy to realization, magnet spool caloric value is little, power chopper part chopping voltage is low, producing is little and operating efficiency is high.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is the relation schematic diagram of voltage magnitude and angle.
Fig. 2 is the frame principle of electromagnetic undervoltage release of the present invention.
Fig. 3 is the circuit structure diagram of the optimum embodiment of electromagnetic undervoltage release of the present invention.
Embodiment
In conjunction with the accompanying drawings, the present invention is further detailed explanation.These accompanying drawings are the schematic diagram of simplification, only basic structure of the present invention are described in a schematic way, and therefore it only shows the formation relevant with the present invention.
For ac grid voltage, the waveform of its voltage is generally sinusoidal wave, namely area in sinusoidal wave angle is power output, the sine wave of one-period has 2 zero crossing moment (trough), the voltage of trough both sides is low, as shown in Figure 1, the angle being located at line voltage (amplitude is A1) is a1, the power that electromagnet DCT obtains is P1, when line voltage reduces to 50%, the angle of (amplitude is A2=50%A1) is a2, the power that electromagnet DCT obtains is P2, then the condition of P1=P2 is: A1 × a2 ≈ A2 × a1, the area equation namely under two angles.
In a less angle (10 °), sinusoidal wave slope variation is very little, the change of amplitude and the time width of trough both sides substantially linear, if A1 is 380V, when a1 is 4.528 °, trough two side ends point voltage is 30.0V, when line voltage reduces to 50%, A2 is 190V, when trough two side ends point voltage is all 30.0V, a2 is 9.085, namely 4.528/9.085=49.8% is had, so conclusion can be obtained, when determining the operating voltage of electromagnet DCT, because operating voltage is lower, angle is very little, even if so the amplitude of line voltage changes, electromagnet DCT still obtains constant power, by to respective area integral, also be not difficult to draw similar conclusion.Therefore, for making electromagnet DCT obtain an approximately constant operating voltage, embodiment is as follows:
As shown in Figure 2, the invention provides a kind of electromagnetic undervoltage release, comprise the EMC circuit of the interference signal produced from electrical network and internal circuit for two-way suppression, full-wave rectifying circuit, power circuit, comparison circuit, trough circuit, drive circuit, switching circuit and electromagnet DCT, two input access line voltages of EMC circuit, two outputs of EMC circuit are connected with two inputs of full-wave rectifying circuit, the positive output end VH of full-wave rectifying circuit and power circuit, comparison circuit, trough circuit is connected with electromagnet DCT, the negative output terminal ground connection of full-wave rectifying circuit, power circuit output end Vcc and comparison circuit, trough circuit is connected with drive circuit, the output of comparison circuit is linked into trough circuit, the output of trough circuit is connected with drive circuit, the output of drive circuit is connected with switching circuit, the output of switching circuit is connected with electromagnet DCT,
Comparison circuit comprise for dividing potential drop is carried out to the output voltage of full-wave rectifying circuit and export the first electrical network sampled voltage SA the first sample circuit and for carrying out dividing potential drop and the reference circuit of output reference voltage SJ to the output voltage of power circuit output end Vcc, comparison circuit also comprises and to be compared by the first electrical network sampled voltage SA and reference voltage SJ and to export the first comparator U1A of the first level, comparison circuit has hysteresis voltage, trough circuit comprise for dividing potential drop is carried out to the output voltage of full-wave rectifying circuit and export the second electrical network sampled voltage SB the second sample circuit and for carrying out dividing potential drop to the first level and exporting the reference circuit of reference level SC, trough circuit also comprises and to be compared by the second electrical network sampled voltage SB and reference level SC and to export the second comparator U1B of second electrical level SO, drive circuit is used for second electrical level SO to carry out amplification and control switch circuit turn-on electromagnet DCT.Waveform for the alternating voltage inputted from electrical network is sine wave, rectification through full-wave rectifying circuit becomes unidirectional pulsating wave, the pulsating wave of one-period has a trough, the magnitude of voltage of trough times is minimum, in order to obtain the lower operating voltage of an electromagnet DCT, and make control circuit simple, reliably, the electromagnetic interference produced is little, second electrical network sampled voltage SB and reference level SC compares by the second comparator U1B, when the second electrical network sampled voltage SB is less than reference level SC, second electrical level SO is carried out amplification and control switch circuit turn-on electromagnet DCT by drive circuit, when the second electrical network sampled voltage SB is greater than reference level SC, drive circuit suspends control switch circuit, electromagnet DCT enters of short duration power failure state, i.e. electromagnet DCT reliably working in the low voltage range of the second electrical network sampled voltage SB trough both sides.
As shown in Figure 3, power circuit comprises the first power rheostat Rw1, second power rheostat Rw2, first triode T1, first voltage stabilizing didoe Z1 and the first filter capacitor C1, the transmitting very power circuit output end Vcc of the first triode T1, export 12V voltage, first power rheostat Rw1 one end connects the positive output end VH of full-wave rectifying circuit, the other end is connected with the collector electrode of the first triode T1, second power rheostat Rw2 one end connects the positive output end VH of full-wave rectifying circuit, the other end is connected with the base stage of the first triode T1, the negative pole of the first voltage stabilizing didoe Z1 is connected with the base stage of the first triode T1, plus earth, the positive pole of the first filter capacitor C1 is connected with the emitter of the first triode T1, minus earth.
EMC circuit comprises the first electric capacity CL1, second electric capacity CL2 and common mode inductance L1, first electric capacity CL1 is connected in parallel on the two ends of common mode inductance L1, second electric capacity CL2 is connected in parallel on the other two ends of common mode inductance L1, first sample circuit comprises the first resistance R1, second resistance R2, 3rd resistance R3 and the second filter capacitor C2, the positive output end VH of full-wave rectifying circuit, first resistance R1 is connected successively with the second resistance R2, second resistance R2 other end ground connection, second filter capacitor C2 is connected in parallel on the two ends of the second resistance R2, first electrical network sampled voltage SA is from drawing between the first resistance R1 and the second resistance R2 and being connected with one end of the 3rd resistance R3, the other end of the 3rd resistance R3 is connected with the in-phase input end of the first comparator U1A, comparison circuit also comprises hysteresis resistance R4, hysteresis resistance R4 one end is connected with the in-phase input end of the first comparator U1A, the other end is connected with the output of the first comparator U1A, reference circuit comprises the 5th resistance R5 and the 6th resistance R6, 5th resistance R5 connects with the 6th resistance R6, the other end of the 5th resistance R5 is connected with power circuit output end Vcc, 6th resistance R6 other end ground connection, reference voltage SJ is from drawing between the 5th circuit and the 6th resistance R6 and being connected with the inverting input of the first comparator U1A, for the parameter set by electromagnetic undervoltage release, when line voltage >=85% rated operational voltage, first electrical network sampled voltage SA >=reference voltage SJ, first level upset is high level, for reference circuit provides input voltage, hysteresis resistance R4 is for improving the first electrical network sampled voltage SA, overcome the critical flutter of the first comparator U1A, by the resistance of setting hysteresis resistance R4, realize when line voltage < 50% rated operational voltage, first electrical network sampled voltage SA< reference voltage SJ, first level upset is low level, first comparator U1A resets, for next action is ready, now electromagnet DCT threads off.
Reference circuit comprises the 7th resistance R7 and the 8th resistance R8, the output of the first comparator U1A is connected with one end of the 7th resistance R7, other one end of 7th resistance R7 is connected with one end of the 8th resistance R8, other one end ground connection of the 8th resistance R8, reference level SC is from drawing between the 7th resistance R7 and the 8th resistance R8 and being connected with the inverting input of the second comparator U1B
In order to the scope of the amplitude with the ratio of the approximately linear of electromagnet DCT ON time of expanding line voltage further, reference circuit can also be connected with off-centre circuit, off-centre circuit comprises the first offset resistance RS1 and the second offset resistance RS2, one end of first offset resistance RS1 is connected with one end of the second offset resistance RS2, first other one end of offset resistance RS1 is connected with the output of the first sample circuit, other one end ground connection of the second offset resistance RS2, offset voltage SS is drawn between first offset resistance RS1 and the second offset resistance RS2, 8th original ground connection one end of resistance R8 makes into be connected with offset voltage SS.
Second sample circuit comprises the 9th resistance R9, second voltage stabilizing didoe Z2, tenth resistance R10, the positive output end VH of full-wave rectifying circuit, 9th resistance R9 is connected successively with the tenth resistance R10, tenth resistance R10 other end ground connection, second voltage stabilizing didoe Z2 is connected in parallel on the two ends of the tenth resistance R10, second electrical network sampled voltage SB is from drawing between the 9th resistance R9 and the tenth resistance R10 and being connected with the in-phase input end of the second comparator U1B, second voltage stabilizing didoe Z2 is used for amplitude limit, as the second electrical network sampled voltage SB< reference level SC, second electrical level SO is low level, as the second electrical network sampled voltage SB> reference level SC, second electrical level SO is high level, drive circuit is that low level drives,
Drive circuit comprises the 11 resistance R11, 12 resistance R12, 13 resistance R13, 14 resistance R14, 15 resistance R15, 3rd electric capacity C3, 4th electric capacity C4, second triode T2, 3rd triode T3, switching circuit comprises metal-oxide-semiconductor T0, the output of the second comparator U1B is connected with one end of the 11 resistance R11, other one end of 11 resistance R11 is connected with the base stage of the second triode T2, 3rd electric capacity C3 is connected in parallel on the two ends of the 11 resistance R11, the emitter of the second triode T2 is connected with power circuit output end Vcc, the collector electrode of the second triode T2 is connected with one end of the 15 resistance R15, other one end of 15 resistance R15 is connected with the grid of metal-oxide-semiconductor T0, one end of 12 resistance R12 is connected with the base stage of the second triode T2, one end is connected with the emitter of the second triode T2 in addition, the output of the second comparator U1B is connected with one end of the 13 resistance R13, other one end of 13 resistance R13 is connected with the base stage of the 3rd triode T3, 4th electric capacity C4 is connected in parallel on the two ends of the 13 resistance R13, the grounded emitter of the 3rd triode T3, the collector electrode of the 3rd triode T3 is connected with the grid of metal-oxide-semiconductor T0, one end of 14 resistance R14 is connected with the base stage of the second triode T2, one end ground connection in addition, the source ground of metal-oxide-semiconductor T0, drain electrode is connected with one end of electromagnet DCT, other one end of electromagnet DCT is connected with the positive output end VH of full-wave rectifying circuit, electromagnet DCT two ends are also parallel with diode D0,
When second electrical level SO is low level, 3rd triode T3 is by the drop-down cut-off of the 14 resistance R14, second triode T2 is biased by the 11 resistance R11 current limliting, second triode T2 conducting, 12V voltage is cushioned to metal-oxide-semiconductor T0 gate charges through the 15 resistance R15 by the second triode T2, the rapid conducting of metal-oxide-semiconductor T0, electromagnet DCT obtains electric; When second electrical level SO is high level, second triode T2 is ended by the 12 resistance R12 pull-up, 3rd triode T3 base stage is biased by the 13 resistance R13 current limliting, 3rd triode T3 conducting, on metal-oxide-semiconductor T0 grid, electric charge is quickly released, and metal-oxide-semiconductor T0 closes, electromagnet DCT dead electricity, 3rd electric capacity C3 and the 4th electric capacity C4 is respectively the speed-up capacitor of second electrical level SO trailing edge and rising edge, shortens the transit time of metal-oxide-semiconductor T0 conducting and closedown further.
Because electromagnet DCT only obtains electric work in the low voltage range of the second electrical network sampled voltage SB trough both sides, discontinuous by the electric current of electromagnet DCT coil, noise can be produced, electromagnet DCT two ends are parallel with the 5th electric capacity C5 for eliminating electromagnet DCT noise, electromagnet DCT obtain electric while, 5th electric capacity C5 charge storage electric charge, when electromagnet DCT dead electricity, 5th electric capacity C5 discharges to electromagnet DCT, thus keep the current continuity of electromagnet DCT, improve the suction of electromagnet DCT.
With above-mentioned according to desirable embodiment of the present invention for enlightenment, by above-mentioned description, relevant staff in the scope not departing from this invention technological thought, can carry out various change and amendment completely.The technical scope of this invention is not limited to the content on specification, must determine its technical scope according to right.
Claims (10)
1. an electromagnetic undervoltage release, it is characterized in that: the EMC circuit comprising the interference signal produced from electrical network and internal circuit for two-way suppression, full-wave rectifying circuit, power circuit, comparison circuit, trough circuit, drive circuit, switching circuit and electromagnet (DCT), two input access line voltages of described EMC circuit, two outputs of described EMC circuit are connected with two inputs of full-wave rectifying circuit, the positive output end (VH) of described full-wave rectifying circuit and power circuit, comparison circuit, trough circuit is connected with electromagnet (DCT), the negative output terminal ground connection of described full-wave rectifying circuit, described power circuit output end (Vcc) and comparison circuit, trough circuit is connected with drive circuit, the output of described comparison circuit is linked into trough circuit, the output of described trough circuit is connected with drive circuit, the output of described drive circuit is connected with switching circuit, the output of described switching circuit is connected with electromagnet (DCT),
Described comparison circuit comprise for dividing potential drop is carried out to the output voltage of full-wave rectifying circuit and export the first electrical network sampled voltage (SA) the first sample circuit and for carrying out dividing potential drop to the output voltage of power circuit output end (Vcc) and the reference circuit of output reference voltage (SJ), described comparison circuit also comprises and the first electrical network sampled voltage (SA) and reference voltage (SJ) is compared and export first comparator (U1A) of the first level, described comparison circuit has hysteresis voltage, described trough circuit comprise for dividing potential drop is carried out to the output voltage of full-wave rectifying circuit and export the second electrical network sampled voltage (SB) the second sample circuit and for carrying out dividing potential drop to the first level and exporting the reference circuit of reference level (SC), described trough circuit also comprises and the second electrical network sampled voltage (SB) and reference level (SC) is compared and export second comparator (U1B) of second electrical level (SO),
Described drive circuit: second electrical level (SO) is carried out amplification and control switch circuit turn-on electromagnet (DCT).
2. the electromagnetic undervoltage release as described in claim 1, it is characterized in that: also comprise off-centre circuit, described off-centre circuit comprises the first offset resistance (RS1) and the second offset resistance (RS2), one end of described first offset resistance (RS1) is connected with one end of the second offset resistance (RS2), described first offset resistance (RS1) is connected with the output of the first sample circuit one end in addition, other one end ground connection of described second offset resistance (RS2), offset voltage (SS) is drawn between described first offset resistance (RS1) and the second offset resistance (RS2), described offset voltage (SS) is connected with reference circuit.
3. the electromagnetic undervoltage release as described in claim 1, is characterized in that: described first comparator (U1A) is operational amplifier, single-chip microcomputer or SOC (system on a chip), and described second comparator (U1B) is operational amplifier, single-chip microcomputer or SOC (system on a chip).
4. the electromagnetic undervoltage release as described in claim 1, it is characterized in that: described EMC circuit comprises the first electric capacity (CL1), the second electric capacity (CL2) and common mode inductance (L1), described first electric capacity (CL1) is connected in parallel on the two ends of common mode inductance (L1), and described second electric capacity (CL2) is connected in parallel on the other two ends of common mode inductance (L1).
5. the electromagnetic undervoltage release as described in claim 1, it is characterized in that: described first sample circuit comprises the first resistance (R1), second resistance (R2), 3rd resistance (R3) and the second filter capacitor (C2), the positive output end (VH) of described full-wave rectifying circuit, first resistance (R1) is connected successively with the second resistance (R2), described second resistance (R2) other end ground connection, described second filter capacitor (C2) is connected in parallel on the two ends of the second resistance (R2), described first electrical network sampled voltage (SA) is from drawing between the first resistance (R1) and the second resistance (R2) and being connected with one end of the 3rd resistance (R3), the other end of described 3rd resistance (R3) is connected with the in-phase input end of the first comparator (U1A), described comparison circuit also comprises hysteresis resistance (R4), described hysteresis resistance (R4) one end is connected with the in-phase input end of the first comparator (U1A), the other end is connected with the output of the first comparator (U1A), described reference circuit comprises the 5th resistance (R5) and the 6th resistance (R6), described 5th resistance (R5) is connected with the 6th resistance (R6), the other end of described 5th resistance (R5) is connected with power circuit output end (Vcc), described 6th resistance (R6) other end ground connection, described reference voltage (SJ) is from drawing between the 5th circuit and the 6th resistance (R6) and being connected with the inverting input of the first comparator (U1A).
6. the electromagnetic undervoltage release as described in claim 1, it is characterized in that: described reference circuit comprises the 7th resistance (R7) and the 8th resistance (R8), the output of described first comparator (U1A) is connected with one end of the 7th resistance (R7), other one end of described 7th resistance (R7) is connected with one end of the 8th resistance (R8), other one end ground connection of described 8th resistance (R8), described reference level (SC) is from drawing between the 7th resistance (R7) and the 8th resistance (R8) and being connected with the inverting input of the second comparator (U1B).
7. the electromagnetic undervoltage release as described in claim 2, it is characterized in that: described reference circuit comprises the 7th resistance (R7) and the 8th resistance (R8), the output of described first comparator (U1A) is connected with one end of the 7th resistance (R7), other one end of described 7th resistance (R7) is connected with one end of the 8th resistance (R8), other one end of described 8th resistance (R8) is connected with offset voltage (SS), described reference level (SC) is from drawing between the 7th resistance (R7) and the 8th resistance (R8) and being connected with the inverting input of the second comparator (U1B).
8. the electromagnetic undervoltage release as described in claim 1, it is characterized in that: described second sample circuit comprises the 9th resistance (R9), second voltage stabilizing didoe (Z2), tenth resistance (R10), the positive output end (VH) of described full-wave rectifying circuit, 9th resistance (R9) is connected successively with the tenth resistance (R10), described tenth resistance (R10) other end ground connection, described second voltage stabilizing didoe (Z2) is connected in parallel on the two ends of the tenth resistance (R10), described second electrical network sampled voltage (SB) is from drawing between the 9th resistance (R9) and the tenth resistance (R10) and being connected with the in-phase input end of the second comparator (U1B).
9. the electromagnetic undervoltage release as described in claim 1, it is characterized in that: described drive circuit comprises the 11 resistance (R11), 12 resistance (R12), 13 resistance (R13), 14 resistance (R14), 15 resistance (R15), 3rd electric capacity (C3), 4th electric capacity (C4), second triode (T2), 3rd triode (T3), described switching circuit comprises MOS pipe (T0), the output of described second comparator (U1B) is connected with one end of the 11 resistance (R11), other one end of described 11 resistance (R11) is connected with the base stage of the second triode (T2), described 3rd electric capacity (C3) is connected in parallel on the two ends of the 11 resistance (R11), the emitter of described second triode (T2) is connected with power circuit output end (Vcc), the collector electrode of described second triode (T2) is connected with one end of the 15 resistance (R15), other one end of described 15 resistance (R15) is connected with the grid of metal-oxide-semiconductor (T0), one end of described 12 resistance (R12) is connected with the base stage of the second triode (T2), one end is connected with the emitter of the second triode (T2) in addition, the output of described second comparator (U1B) is connected with one end of the 13 resistance (R13), other one end of described 13 resistance (R13) is connected with the base stage of the 3rd triode (T3), described 4th electric capacity (C4) is connected in parallel on the two ends of the 13 resistance (R13), the grounded emitter of described 3rd triode (T3), the collector electrode of described 3rd triode (T3) manages (T0) grid with MOS is connected, one end of described 14 resistance (R14) is connected with the base stage of the second triode (T2), one end ground connection in addition, the source ground of described MOS pipe (T0), drain electrode is connected with one end of electromagnet (DCT), other one end of described electromagnet (DCT) is connected with the positive output end (VH) of full-wave rectifying circuit, described electromagnet (DCT) two ends are also parallel with diode (D0).
10. the electromagnetic undervoltage release as described in claim 1, it is characterized in that: power circuit comprises the first power rheostat (Rw1), second power rheostat (Rw2), first triode (T1), first voltage stabilizing didoe (Z1) and the first filter capacitor (C1), the transmitting very power circuit output end (Vcc) of described first triode (T1), described first power rheostat (Rw1) one end connects the positive output end (VH) of full-wave rectifying circuit, the other end is connected with the collector electrode of the first triode (T1), described second power rheostat (Rw2) one end connects the positive output end (VH) of full-wave rectifying circuit, the other end is connected with the base stage of the first triode (T1), the negative pole of described first voltage stabilizing didoe (Z1) is connected with the base stage of the first triode (T1), plus earth, the positive pole of described first filter capacitor (C1) is connected with the emitter of the first triode (T1), minus earth.
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| CN103647250B (en) * | 2013-12-05 | 2016-04-06 | 江苏国星电器有限公司 | Electromagnetic undervoltage release and control method thereof |
| CN104882849B (en) * | 2014-02-28 | 2019-02-05 | 北京谊安医疗系统股份有限公司 | Electrical equipment and its low pressure shutdown circuit |
| CN104269819A (en) * | 2014-08-21 | 2015-01-07 | 常州工学院 | Electromagnetic type undervoltage tripping device |
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Effective date of registration: 20171101 Address after: Wujin District of Jiangsu city in Changzhou Province before 213177 Huang Zhen Zhai Bridge Industrial Park before the Village Road No. 3 Patentee after: Jiangsu Guoxing Electrical Apparatus Co.Ltd Address before: 213177 Jiangsu province Changzhou city Wujin District Bridge Industrial Park in front of the Middle Road Co-patentee before: Changzhou Polytechnic College Patentee before: Jiangsu Guoxing Electrical Apparatus Co.Ltd |
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