CN103325633A - Electromagnetic type undervoltage release - Google Patents
Electromagnetic type undervoltage release Download PDFInfo
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- CN103325633A CN103325633A CN2013101680597A CN201310168059A CN103325633A CN 103325633 A CN103325633 A CN 103325633A CN 2013101680597 A CN2013101680597 A CN 2013101680597A CN 201310168059 A CN201310168059 A CN 201310168059A CN 103325633 A CN103325633 A CN 103325633A
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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, relate in particular to a kind of electromagnetic undervoltage release.
Background technology
Device for under-voltage releasing equipment is circuit breaker, especially one of critical elements of frame-type circuit breaker.In voltage drop (even slow decreasing) arrived 70%～35% scope of rated operational voltage, device for under-voltage releasing equipment should move; Supply voltage be lower than rated operational voltage 35% the 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%, should be able to guarantee the circuit breaker normally closed, the essence of undervoltage tripping, be prevent circuit breaker subordinate electric equipment be operated under the under-voltage condition electric current excessive after, the effective measures that the 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 electromagnet of means acquisition by copped wave is come, " copped wave " constantly, when occurring in the peak value of input supply voltage, its copped wave amplitude is very large (such as the power supply input of 380V, peak-peak is 537V), have a strong impact on the safety of copped wave power device, and producing serious electromagnetic interference, the control circuit reliability also obviously reduces.
Summary of the invention
The technical problem to be solved in the present invention is: have in order to solve existing electromagnetic undervoltage release that the coil heating amount is high, control circuit is complicated, efficient is low and control circuit can produce serious electromagnetic interference, affect the problem of device safety, the invention provides a kind of electromagnetic undervoltage release employing and comprise that the control circuit of trough circuit solves 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 for the EMC circuit of two-way inhibition from the interference signal of electrical network and internal circuit generation, full-wave rectifying circuit, power circuit, comparison circuit, the 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, the 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, the trough circuit is connected with drive circuit, the output of described comparison circuit is linked into the 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 the input voltage to full-wave rectifying circuit and carries out dividing potential drop and export the first sample circuit of the first electrical network sampled voltage and be used for the output voltage of power circuit output end is carried out the reference circuit of dividing potential drop and output reference voltage, described comparison circuit also comprises the first comparator that the first electrical network sampled voltage and reference voltage is compared and export the first level, described comparison circuit has hysteresis voltage, described trough circuit comprises for the input voltage to full-wave rectifying circuit and carries out dividing potential drop and export the second sample circuit of the second electrical network sampled voltage and be used for the first level is carried out dividing potential drop and exports the reference circuit of reference level, described trough circuit also comprises the second comparator that the second electrical network sampled voltage and reference level is compared and export second electrical level, and described drive circuit is used for second electrical level is amplified and control switch circuit turn-on electromagnet.Waveform for the alternating voltage of inputting 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, trough magnitude of voltage constantly is minimum, in order to obtain an operating voltage that electromagnet is lower, and so that control circuit is simple, reliably, the electromagnetic interference that produces is little, the second comparator compares the second electrical network sampled voltage and reference level, when the second electrical network sampled voltage during less than reference level, drive circuit amplifies second electrical level and control switch circuit turn-on electromagnet, when the second electrical network sampled voltage during greater than reference level, drive circuit suspends the control switch circuit, and 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 the electromagnet only low voltage range in the second electrical network sampled voltage trough both sides gets electric work, electric current by the electromagnet coil is also discontinuous, can produce noise, described electromagnet two ends are parallel with for the 5th electric capacity of eliminating the electromagnet noise, and electromagnet gets electric the time, and the 5th capacitor charging stores electric charge, when the electromagnet dead electricity, the 5th electric capacity discharges to electromagnet, thereby keeps the current continuity of electromagnet, improves the suction of electromagnet.
In order further to expand the amplitude of line voltage and the scope of the ratio of the approximately linear of electromagnet ON time, also comprise off-centre circuit, described off-centre circuit comprises the first offset resistance and the second offset resistance, one end of described the first offset resistance is connected with an end of the second offset resistance, the other end of described the first offset resistance is connected with the output of the first sample circuit, an other end ground connection of described the second offset resistance, draw offset voltage between described the first offset resistance and the second offset resistance, described offset voltage is connected with reference circuit.
Described the first comparator is operational amplifier, single-chip microcomputer or SOC (system on a chip), described the second comparator is operational amplifier, single-chip microcomputer or SOC (system on a chip), the first comparator and the second comparator are realized respectively the comparing function of comparison circuit and trough circuit, perhaps described the 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), the first comparator and the second comparator unite two into one, and realize simultaneously the comparing function of comparison circuit and trough circuit.
Described EMC circuit comprises the first electric capacity, the second electric capacity and common mode inductance, and described the first Capacitance parallel connection is at the two ends of common mode inductance, and described the second Capacitance parallel connection is at the other two ends of common mode inductance, the π type filter circuit that this EMC circuit can also be other form.
Described the first sample circuit comprises the first resistance, the second resistance, the 3rd resistance and the second filter capacitor, the positive output end of described full-wave rectifying circuit, the first resistance be connected resistance and connect successively, described the second resistance other end ground connection, described the second filter capacitor is connected in parallel on the two ends of the second resistance, described the first electrical network sampled voltage is from drawing between the first resistance and the second resistance and being connected with an end of the 3rd resistance, the other end of described the 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 the 5th resistance is connected with the 6th resistance, the other end of described the 5th resistance is connected with power circuit output end, described the 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, the parameter that sets for electromagnetic undervoltage release, when line voltage 〉=n% rated operational voltage (0＜n＜100), first electrical network sampled voltage 〉=reference voltage, the upset of the first level is high level, for reference circuit provides input voltage, hysteresis resistance is used for improving the first electrical network sampled voltage, overcome the critical flutter of the first comparator, by setting the resistance of hysteresis resistance, realize when line voltage＜m% rated operational voltage (0＜m＜n), first electrical network sampled voltage＜reference voltage, the upset of the first level is low level, the first comparator resets, ready for action next time, this moment, electromagnet was threaded off.
The connected mode of circuit is not when having off-centre circuit: described reference circuit comprises the 7th resistance and the 8th resistance, the output of described the first comparator is connected with an end of the 7th resistance, an other end of described the 7th resistance is connected with an end of the 8th resistance, an other end ground connection of described the 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 of circuit is when having off-centre circuit: described reference circuit comprises the 7th resistance and the 8th resistance, the output of described the first comparator is connected with an end of the 7th resistance, an other end of described the 7th resistance is connected with an end of the 8th resistance, an other end of described the 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 the second sample circuit comprises the 9th resistance, the second voltage stabilizing didoe, the tenth resistance, the positive output end of described full-wave rectifying circuit, the 9th resistance connects successively with the tenth resistance, described the tenth resistance other end ground connection, described the second voltage stabilizing didoe is connected in parallel on the two ends of the tenth resistance, described the 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, the 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〉during reference level, second electrical level is high level, drive circuit is that low level drives, drive circuit also can be that high level drives, and only needs the second electrical network sampled voltage is accessed the inverting input of the second comparator, reference level access in-phase input end.
Drive circuit is the preferred electrical architecture for that low level drives: described drive circuit comprises the 11 resistance, the 12 resistance, the 13 resistance, the 14 resistance, the 15 resistance, the 3rd electric capacity, the 4th electric capacity, the second triode, the 3rd triode, described switching circuit comprises metal-oxide-semiconductor, the output of described the second comparator is connected with an end of the 11 resistance, an other end of described the 11 resistance is connected with the base stage of the second triode, described the 3rd Capacitance parallel connection is at the two ends of the 11 resistance, the emitter of described the second triode is connected with power circuit output end, the collector electrode of described the second triode is connected with an end of the 15 resistance, an other end of described the 15 resistance is connected with the grid of metal-oxide-semiconductor, one end of described the 12 resistance is connected with the base stage of the second triode, an other end is connected with the emitter of the second triode, the output of described the second comparator is connected with an end of the 13 resistance, an other end of described the 13 resistance is connected with the base stage of the 3rd triode, described the 4th Capacitance parallel connection is at the two ends of the 13 resistance, the grounded emitter of described the 3rd triode, the collector electrode of described the 3rd triode is connected with the grid of metal-oxide-semiconductor, one end of described the 14 resistance is connected with the base stage of the second triode, an other end ground connection, the source ground of described metal-oxide-semiconductor, drain electrode is connected with an end of electromagnet, an other end of described electromagnet is connected with the positive output end of full-wave rectifying circuit, and described electromagnet two ends also are parallel with diode.
Power circuit comprises the first power rheostat, the second power rheostat, the first triode, the first voltage stabilizing didoe and the first filter capacitor, the emission of described the first triode is power circuit output end very, described the 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 the 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 the first voltage stabilizing didoe is connected with the base stage of the first triode, plus earth, the positive pole of described the 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 circuit form or the PWM form.
The invention has the beneficial effects as follows, safe and reliable, the simple in structure easy realization of the control circuit of this electromagnetic undervoltage release, the magnet spool caloric value is little, power chopper spare chopping voltage is low, the electromagnetic interference that produces is little and high efficiency.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is the schematic diagram that concerns 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, basic structure of the present invention only is described in a schematic way, so it only show the formation relevant with the present invention.
For ac grid voltage, it is sinusoidal wave that the waveform of its voltage is generally, area in the sinusoidal wave angle namely 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 that is located at line voltage (amplitude is A1) is a1, the power that electromagnet DCT obtains is P1, the angle of (amplitude is A2=50%A1) is a2 when line voltage reduces to 50%, the power that electromagnet DCT obtains is P2, and then the condition of P1=P2 is: A1 * a2 ≈ A2 * a1, namely the area under two angles equates.
In a less angle (10 °), sinusoidal wave slope variation is very little, the time width of the variation of amplitude and trough both sides is substantially linear, be 380V such as A1, when a1 is 4.528 °, trough two side ends point voltage is 30.0V, reducing to 50%, A2 when line voltage is 190V, when trough two side ends point voltage is all 30.0V, a2 is 9.085,4.528/9.085=49.8% is namely arranged, can obtain conclusion so, when having determined the operating voltage of electromagnet DCT, because operating voltage is lower, angle is very little, even the amplitude of line voltage changes so, electromagnet DCT still obtains constant power, by to separately area integral, also be not difficult to draw similar conclusion.Therefore, obtain an approximately constant operating voltage for making electromagnet DCT, embodiment is as follows:
As shown in Figure 2, the invention provides a kind of electromagnetic undervoltage release, comprise for the EMC circuit of two-way inhibition from the interference signal of electrical network and internal circuit generation, full-wave rectifying circuit, power circuit, comparison circuit, the 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, positive output end VH and the power circuit of full-wave rectifying circuit, comparison circuit, the 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, the trough circuit is connected with drive circuit, the output of comparison circuit is linked into the 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 comprises for the input voltage to full-wave rectifying circuit and carries out dividing potential drop and export the first sample circuit of the first electrical network sampled voltage SA and be used for the output voltage of power circuit output end Vcc is carried out the reference circuit of dividing potential drop and output reference voltage SJ, comparison circuit also comprises the first comparator U1A that the first electrical network sampled voltage SA and reference voltage SJ is compared and export the first level, comparison circuit has hysteresis voltage, the trough circuit comprises for the input voltage to full-wave rectifying circuit and carries out dividing potential drop and export the second sample circuit of the second electrical network sampled voltage SB and be used for the first level is carried out dividing potential drop and exports the reference circuit of reference level SC, the trough circuit also comprises the second comparator U1B that the second electrical network sampled voltage SB and reference level SC is compared and export second electrical level SO, and drive circuit is used for second electrical level SO is amplified and control switch circuit turn-on electromagnet DCT.Waveform for the alternating voltage of inputting 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, trough magnitude of voltage constantly is minimum, in order to obtain an operating voltage that electromagnet DCT is lower, and so that control circuit is simple, reliably, the electromagnetic interference that produces is little, the second comparator U1B compares the second electrical network sampled voltage SB and reference level SC, as the second electrical network sampled voltage SB during less than reference level SC, drive circuit amplifies second electrical level SO and control switch circuit turn-on electromagnet DCT, as the second electrical network sampled voltage SB during greater than reference level SC, drive circuit suspends the 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, the second power rheostat Rw2, the first triode T1, the first voltage stabilizing didoe Z1 and the first filter capacitor C1, the emission of the first triode T1 is power circuit output end Vcc very, output 12V voltage, the 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, the 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 minus earth with the emitter of the first triode T1.
The EMC circuit comprises the first capacitor C L1, the second capacitor C L2 and common mode inductance L1, the first capacitor C L1 is connected in parallel on the two ends of common mode inductance L1, the second capacitor C L2 is connected in parallel on the other two ends of common mode inductance L1, the first sample circuit comprises the first resistance R 1, the second resistance R 2, the 3rd resistance R 3 and the second filter capacitor C2, the positive output end VH of full-wave rectifying circuit, the first resistance R 1 be connected resistance R 2 and connect successively, the second resistance R 2 other end ground connection, the second filter capacitor C2 is connected in parallel on the two ends of the second resistance R 2, the first electrical network sampled voltage SA is from drawing between the first resistance R 1 and the second resistance R 2 and being connected with an end of the 3rd resistance R 3, the other end of the 3rd resistance R 3 is connected with the in-phase input end of the first comparator U1A, comparison circuit also comprises hysteresis resistance R 4, hysteresis resistance R 4 one ends are 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 R 5 and the 6th resistance R 6, the 5th resistance R 5 is connected with the 6th resistance R 6, the other end of the 5th resistance R 5 is connected with power circuit output end Vcc, the 6th resistance R 6 other end ground connection, reference voltage SJ is from drawing between the 5th circuit and the 6th resistance R 6 and being connected with the inverting input of the first comparator U1A, the parameter that sets for electromagnetic undervoltage release, when line voltage 〉=85% rated operational voltage, first electrical network sampled voltage SA 〉=reference voltage SJ, the upset of the first level is high level, for reference circuit provides input voltage, hysteresis resistance R 4 is used for improving the first electrical network sampled voltage SA, overcome the critical flutter of the first comparator U1A, by setting the resistance of hysteresis resistance R 4, realize when line voltage＜50% rated operational voltage, first electrical network sampled voltage SA＜reference voltage SJ, the upset of the first level is low level, the first comparator U1A resets, ready for action next time, this moment, electromagnet DCT threaded off.
Reference circuit comprises the 7th resistance R 7 and the 8th resistance R 8, the output of the first comparator U1A is connected with an end of the 7th resistance R 7, an other end of the 7th resistance R 7 is connected with an end of the 8th resistance R 8, an other end ground connection of the 8th resistance R 8, reference level SC is from drawing between the 7th resistance R 7 and the 8th resistance R 8 and being connected with the inverting input of the second comparator U1B
In order further to expand the amplitude of line voltage and the scope of the ratio of the approximately linear of electromagnet DCT ON time, 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, the end of the first offset resistance RS1 is connected with the end of the second offset resistance RS2, the other end of the first offset resistance RS1 is connected with the output of the first sample circuit, the other end ground connection of the second offset resistance RS2, draw offset voltage SS between the first offset resistance RS1 and the second offset resistance RS2, the 8th resistance R 8 original ground connection one ends make into to be connected with offset voltage SS.
The second sample circuit comprises the 9th resistance R 9, the second voltage stabilizing didoe Z2, the tenth resistance R 10, the positive output end VH of full-wave rectifying circuit, the 9th resistance R 9 connects successively with the tenth resistance R 10, the tenth resistance R 10 other end ground connection, the second voltage stabilizing didoe Z2 is connected in parallel on the two ends of the tenth resistance R 10, the second electrical network sampled voltage SB is from drawing between the 9th resistance R 9 and the tenth resistance R 10 and being connected with the in-phase input end of the second comparator U1B, the second voltage stabilizing didoe Z2 is used for amplitude limit, when 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〉during reference level SC, second electrical level SO is high level, drive circuit is that low level drives
Drive circuit comprises the 11 resistance R 11, the 12 resistance R 12, the 13 resistance R 13, the 14 resistance R 14, the 15 resistance R 15, the 3rd capacitor C 3, the 4th capacitor C 4, the second triode T2, the 3rd triode T3, switching circuit comprises metal-oxide-semiconductor T0, the output of the second comparator U1B is connected with an end of the 11 resistance R 11, an other end of the 11 resistance R 11 is connected with the base stage of the second triode T2, the 3rd capacitor C 3 is connected in parallel on the two ends of the 11 resistance R 11, 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 an end of the 15 resistance R 15, an other end of the 15 resistance R 15 is connected with the grid of metal-oxide-semiconductor T0, one end of the 12 resistance R 12 is connected with the base stage of the second triode T2, an other end is connected with the emitter of the second triode T2, the output of the second comparator U1B is connected with an end of the 13 resistance R 13, an other end of the 13 resistance R 13 is connected with the base stage of the 3rd triode T3, the 4th capacitor C 4 is connected in parallel on the two ends of the 13 resistance R 13, 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 the 14 resistance R 14 is connected with the base stage of the second triode T2, an other end ground connection, the source ground of metal-oxide-semiconductor T0, drain electrode is connected with the end of electromagnet DCT, the other end of electromagnet DCT is connected with the positive output end VH of full-wave rectifying circuit, electromagnet DCT two ends also are parallel with diode D0
When second electrical level SO is low level, the 3rd triode T3 is by the 14 drop-down cut-offs of the 14 resistance R, the second triode T2 is setovered by the 11 resistance R 11 current limlitings, the second triode T2 conducting, 12V voltage cushions to metal-oxide-semiconductor T0 gate charges through the 15 resistance R 15 by the second triode T2, the rapid conducting of metal-oxide-semiconductor T0, electromagnet DCT gets electric; When second electrical level SO is high level, the second triode T2 is drawn cut-off on the 12 resistance R 12, the 3rd triode T3 base stage is setovered by the 13 resistance R 13 current limlitings, the 3rd triode T3 conducting, electric charge is discharged rapidly on the metal-oxide-semiconductor T0 grid, and metal-oxide-semiconductor T0 closes, electromagnet DCT dead electricity, the 3rd capacitor C 3 and the 4th capacitor C 4 are respectively the speed-up capacitor of second electrical level SO trailing edge and rising edge, further shorten metal-oxide-semiconductor T0 conducting and the transit time of closing.
Because the electromagnet DCT only low voltage range in the second electrical network sampled voltage SB trough both sides gets electric work, electric current by electromagnet DCT coil is also discontinuous, can produce noise, electromagnet DCT two ends are parallel with for the 5th capacitor C 5 of eliminating electromagnet DCT noise, electromagnet DCT gets electric the time, 5 chargings of the 5th capacitor C store electric charge, when electromagnet DCT dead electricity, 5 couples of electromagnet DCT of the 5th capacitor C discharge, thereby the current continuity that keeps electromagnet DCT, the suction of raising electromagnet DCT.
Take above-mentioned foundation desirable embodiment of the present invention as enlightenment, by above-mentioned description, the relevant staff can in the scope that does not depart from this invention technological thought, carry out various change and modification fully.The technical scope of this invention is not limited to the content on the specification, must determine its technical scope according to the claim scope.
Claims (10)
1. electromagnetic undervoltage release, it is characterized in that: comprise for the EMC circuit of two-way inhibition from the interference signal of electrical network and internal circuit generation, full-wave rectifying circuit, power circuit, comparison circuit, the 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 of described full-wave rectifying circuit (VH) and power circuit, comparison circuit, the trough circuit is connected DCT with electromagnet) connect, the negative output terminal ground connection of described full-wave rectifying circuit, described power circuit output end (Vcc) and comparison circuit, the trough circuit is connected with drive circuit, the output of described comparison circuit is linked into the 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 comprises for the input voltage to full-wave rectifying circuit and carries out dividing potential drop and export the first sample circuit of the first electrical network sampled voltage (SA) and be used for the output voltage of power circuit output end (Vcc) is carried out the reference circuit of dividing potential drop and output reference voltage (SJ), described comparison circuit also comprises the first comparator (U1A) that the first electrical network sampled voltage (SA) and reference voltage (SJ) is compared and export the first level, described comparison circuit has hysteresis voltage, described trough circuit comprises for the input voltage to full-wave rectifying circuit and carries out dividing potential drop and export the second sample circuit of the second electrical network sampled voltage (SB) and be used for the first level is carried out dividing potential drop and exports the reference circuit of reference level (SC), described trough circuit also comprises the second comparator (U1B) that the second electrical network sampled voltage (SB) and reference level (SC) is compared and export second electrical level (SO)
Described drive circuit: second electrical level (SO) is amplified and control switch circuit turn-on electromagnet (DCT).
2. electromagnetic undervoltage release as claimed 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 the first offset resistance (RS1) is connected with an end of the second offset resistance (RS2), the other end of described the first offset resistance (RS1) is connected with the output of the first sample circuit, an other end ground connection of described the second offset resistance (RS2), draw offset voltage (SS) between described the first offset resistance (RS1) and the second offset resistance (RS2), described offset voltage (SS) is connected with reference circuit.
3. electromagnetic undervoltage release as claimed in claim 1, it is characterized in that: described the first comparator (U1A) is operational amplifier, single-chip microcomputer or SOC (system on a chip), described the second comparator (U1B) is operational amplifier, single-chip microcomputer or SOC (system on a chip).
4. electromagnetic undervoltage release as claimed 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 the first electric capacity (CL1) is connected in parallel on the two ends of common mode inductance (L1), and described the second electric capacity (CL2) is connected in parallel on the other two ends of common mode inductance (L1).
5. electromagnetic undervoltage release as claimed in claim 1, it is characterized in that: described the first sample circuit comprises the first resistance (R1), the second resistance (R2), the 3rd resistance (R3) and the second filter capacitor (C2), the positive output end of described full-wave rectifying circuit (VH), the first resistance (R1) be connected resistance (R2) and connect successively, described the second resistance (R2) other end ground connection, described the second filter capacitor (C2) is connected in parallel on the two ends of the second resistance (R2), described the first electrical network sampled voltage (SA) is from drawing between the first resistance (R1) and the second resistance (R2) and being connected with an end of the 3rd resistance (R3), the other end of described the 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) 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 the 5th resistance (R5) is connected with the 6th resistance (R6), the other end of described the 5th resistance (R5) is connected with power circuit output end (Vcc), described the 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. electromagnetic undervoltage release as claimed 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 the first comparator (U1A) is connected with an end of the 7th resistance (R7), an other end of described the 7th resistance (R7) is connected with an end of the 8th resistance (R8), an other end ground connection of described the 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. electromagnetic undervoltage release as claimed 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 the first comparator (U1A) is connected with an end of the 7th resistance (R7), an other end of described the 7th resistance (R7) is connected with an end of the 8th resistance (R8), an other end of described the 8th resistance (R8) is connected with offset voltage (SS), and 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. electromagnetic undervoltage release as claimed in claim 1, it is characterized in that: described the second sample circuit comprises the 9th resistance (R9), the second voltage stabilizing didoe (Z2), the tenth resistance (R10), the positive output end of described full-wave rectifying circuit (VH), the 9th resistance (R9) connects successively with the tenth resistance (R10), described the tenth resistance (R10) other end ground connection, described the second voltage stabilizing didoe (Z2) is connected in parallel on the two ends of the tenth resistance (R10), and described the 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. electromagnetic undervoltage release as claimed in claim 1, it is characterized in that: described drive circuit comprises the 11 resistance (R11), the 12 resistance (R12), the 13 resistance (R13), the 14 resistance (R14), the 15 resistance (R15), the 3rd electric capacity (C3), the 4th electric capacity (C4), the second triode (T2), the 3rd triode (T3), described switching circuit comprises metal-oxide-semiconductor (T0), the output of described the second comparator (U1B) is connected with an end of the 11 resistance (R11), an other end of described the 11 resistance (R11) is connected with the base stage of the second triode (T2), described the 3rd electric capacity (C3) is connected in parallel on the two ends of the 11 resistance (R11), the emitter of described the second triode (T2) is connected with power circuit output end (Vcc), the collector electrode of described the second triode (T2) is connected with an end of the 15 resistance (R15), an other end of described the 15 resistance (R15) is connected with the grid of metal-oxide-semiconductor (T0), one end of described the 12 resistance (R12) is connected with the base stage of the second triode (T2), an other end is connected with the emitter of the second triode (T2), the output of described the second comparator (U1B) is connected with an end of the 13 resistance (R13), an other end of described the 13 resistance (R13) is connected with the base stage of the 3rd triode (T3), described the 4th electric capacity (C4) is connected in parallel on the two ends of the 13 resistance (R13), the grounded emitter of described the 3rd triode (T3), the collector electrode of described the 3rd triode (T3) is connected with the grid of metal-oxide-semiconductor (T0), one end of described the 14 resistance (R14) is connected with the base stage of the second triode (T2), an other end ground connection, the source ground of described metal-oxide-semiconductor (T0), drain electrode is connected with an end of electromagnet (DCT), an other end of described electromagnet (DCT) is connected with the positive output end (VH) of full-wave rectifying circuit, and described electromagnet (DCT) two ends also are parallel with diode (D0).
10. electromagnetic undervoltage release as claimed in claim 1, it is characterized in that: power circuit comprises the first power rheostat (Rw1), the second power rheostat (Rw2), the first triode (T1), the first voltage stabilizing didoe (Z1) and the first filter capacitor (C1), the emission of described the first triode (T1) is power circuit output end (Vcc) very, described the first power rheostat (Rw1) 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 the second power rheostat (Rw2) 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 the first voltage stabilizing didoe (Z1) is connected with the base stage of the first triode (T1), plus earth, the positive pole of described the first filter capacitor (C1) is connected minus earth with the emitter of the first triode (T1).
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| CN104269819A (en) * | 2014-08-21 | 2015-01-07 | 常州工学院 | Electromagnetic type undervoltage tripping device |
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|---|---|
| CN103325633B (en) | 2015-03-04 |
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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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