CN203261001U - Electromagnetic type under-voltage tripping device - Google Patents
Electromagnetic type under-voltage tripping device Download PDFInfo
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- CN203261001U CN203261001U CN 201320247514 CN201320247514U CN203261001U CN 203261001 U CN203261001 U CN 203261001U CN 201320247514 CN201320247514 CN 201320247514 CN 201320247514 U CN201320247514 U CN 201320247514U CN 203261001 U CN203261001 U CN 203261001U
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Abstract
The utility model provides an electromagnetic type under-voltage tripping device comprising an EMC circuit used for bilaterally suppressing interference signals generated by electric network and inner circuits, a full wave rectifier circuit, a power circuit, a comparison circuit, a trough circuit, a drive circuit, a switch circuit and an electromagnet; a positive output end of the full wave rectifier circuit is connected with the power circuit, the comparison circuit, the trough circuit and the electromagnet; an output end of the power circuit is connected with the comparison circuit, the trough circuit and the drive circuit; an output end of the comparison circuit is connected with the trough circuit; an output end of the trough circuit is connected with the drive circuit; an output end of the drive circuit is connected with the switch circuit; and an output end of the switch circuit is connected with the electromagnet. The electromagnetic type under-voltage tripping device is safe and reliable in control circuit; the structure is easy to realize; coil heating amount of the electromagnet is small; chopper voltage of power chopper element is low; generated electromagnetic interference is small; and work efficiency is high.
Description
Technical field
The utility model relates to a kind of low tension switch control field, relates 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.
The utility model content
The technical problems to be solved in the utility model is: there is coil heating amount height in existing electromagnetic undervoltage release, control circuit is complicated, efficient is low and control circuit can produce serious electromagnetic interference in order to solve, affect the problem of device safety, the utility model provides a kind of electromagnetic undervoltage release employing to comprise that the control circuit of trough circuit solves the problems referred to above.
The technical scheme that its technical problem that solves the utility model adopts 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.
For the scope of the amplitude of further expanding line voltage and the ratio of the approximately linear of electromagnet ON time also comprises 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, the parameter of described reference voltage from drawing between the 5th circuit and the 6th resistance and electromagnetic undervoltage release being set with the inverting input connecting needle of the first comparator, 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 beneficial effects of the utility model are, 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 little and high efficiency of electromagnetic interference that produces.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is the schematic diagram that concerns of voltage magnitude and angle.
Fig. 2 is the frame principle of the utility model electromagnetic undervoltage release.
Fig. 3 is the circuit structure diagram of the optimum embodiment of the utility model electromagnetic undervoltage release.
Embodiment
By reference to the accompanying drawings the utility model is described in further detail now.These accompanying drawings are the schematic diagram of simplification, basic structure of the present utility model only is described in a schematic way, so it only show the formation relevant with the utility model.
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 utility model 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 the electric current of electric work by electromagnet DCT coil and 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 utility model as enlightenment, by above-mentioned description, the relevant staff can in the scope that does not depart from this utility model technological thought, carry out various change and modification fully.The technical scope of this utility model 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).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320247514 CN203261001U (en) | 2013-05-08 | 2013-05-08 | Electromagnetic type under-voltage tripping device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320247514 CN203261001U (en) | 2013-05-08 | 2013-05-08 | Electromagnetic type under-voltage tripping device |
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| CN203261001U true CN203261001U (en) | 2013-10-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201320247514 Withdrawn - After Issue CN203261001U (en) | 2013-05-08 | 2013-05-08 | Electromagnetic type under-voltage tripping device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103325633A (en) * | 2013-05-08 | 2013-09-25 | 江苏国星电器有限公司 | Electromagnetic type undervoltage release |
| CN105390348A (en) * | 2015-07-22 | 2016-03-09 | 林宣荣 | Under-voltage release controller and control method thereof |
-
2013
- 2013-05-08 CN CN 201320247514 patent/CN203261001U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103325633A (en) * | 2013-05-08 | 2013-09-25 | 江苏国星电器有限公司 | Electromagnetic type undervoltage release |
| CN103325633B (en) * | 2013-05-08 | 2015-03-04 | 江苏国星电器有限公司 | Electromagnetic type undervoltage release |
| CN105390348A (en) * | 2015-07-22 | 2016-03-09 | 林宣荣 | Under-voltage release controller and control method thereof |
| CN105390348B (en) * | 2015-07-22 | 2019-03-26 | 林宣荣 | A kind of controller and its control method of under-voltage release |
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