CN101552450B - Pure simulation circuit for realizing undervoltage instantaneous release - Google Patents
Pure simulation circuit for realizing undervoltage instantaneous release Download PDFInfo
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- CN101552450B CN101552450B CN2008102073618A CN200810207361A CN101552450B CN 101552450 B CN101552450 B CN 101552450B CN 2008102073618 A CN2008102073618 A CN 2008102073618A CN 200810207361 A CN200810207361 A CN 200810207361A CN 101552450 B CN101552450 B CN 101552450B
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Abstract
The invention discloses a pure simulation circuit for realizing undervoltage release. The circuit comprises: a rectifying circuit connected to an alternating current input power supply, a pull-in maintaining circuit connected to the rectifying circuit to generate a signal of the pull-in maintaining circuit, an undervoltage threshold decision circuit connected to the rectifying circuit to judge theundervoltage threshold, an initial pull-in current delay circuit connected to the undervoltage threshold decision circuit, an MOSFET drive circuit connected to the outputs of the rectifying circuit, the pull-in maintaining circuit and the initial pull-in current delay circuit and then a drive signal is output after the outputs of the three circuits are integrated, and an electromagnet actuating mechanism connected to the MOSFET drive circuit to control the pull-in or breakoff of the electromagnet according to the drive signal.
Description
Technical field
The present invention relates to the under-voltage release control circuit, more particularly, relate to a kind of pure analog circuit of realizing the under voltage instantaneous trip.
Background technology
Generally all used dissimilar single-chip microcomputers in the existing under-voltage release control circuit, utilized the logical process function of single-chip microcomputer and PWM modulating action to cut-off control, the real-time response characteristic is relatively poor, a little less than the anti-electromagnetic interference capability.
Summary of the invention
The invention provides a kind of pure analog circuit of realizing the under voltage instantaneous trip.
According to the present invention, a kind of pure analog circuit of realizing that under voltage is threaded off is provided, comprising:
Rectification circuit is connected to alternating current input power supplying;
Keep attraction circuit, be connected to rectification circuit, produce and keep the attraction circuit signal;
Under voltage threshold decision circuit is connected to rectification circuit, judges the threshold of under voltage;
Initial attract current delay circuit is connected under voltage threshold decision circuit;
The MOSFET drive circuit is connected to rectification circuit, is connected to the output of keeping attraction circuit and initial attract current delay circuit, comprehensive rectification circuit, keeps output drive signal after the output of attraction circuit and initial attract current delay circuit;
The electromagnet actuating mechanism is connected to described MOSFET drive circuit, according to the adhesive or the disjunction of drive signal control electromagnet.
Keeping attraction circuit comprises:
First operational amplifier, the signal of rectification circuit is input to the negative terminal of described first operational amplifier;
The first component piezoresistance;
Wherein, by adjusting the resistance of the resistance in the first component piezoresistance, it is high level that first operational amplifier is exported permanent when input voltage is lower than second predetermined value, and when input voltage is higher than second predetermined value, first operational amplifier output variable duty ratio square wave.
Under voltage threshold decision circuit comprises:
By the filter circuit that resistance and electric capacity constitute, that the half-wave voltage signal filter of input is flat;
Second operational amplifier, the signal of rectification circuit be the anode of described second operational amplifier of input behind the wave circuit after filtration;
Positive feedback resistor;
Wherein, the positive feedback resistor and second operational amplifier constitute schmitt trigger, when input voltage is ascending when surpassing first predetermined value, the output generation saltus step of second operational amplifier, change high level into by low level, as long as and input voltage maintain more than second predetermined value, the output of second operational amplifier with regard to constant be high level, when input voltage drops to second predetermined value when following, the output of second operational amplifier saltus step again is low level.
This under voltage threshold decision circuit also comprises: the second component piezoresistance, by adjusting the resistance of the resistance in the described second component piezoresistance, adjust the size of described first predetermined value and second predetermined value.
Initial attract current delay circuit comprises: by the differential circuit that NAND gate, resistance and electric capacity constitute, utilize the charging interval of electric capacity to delay time.
The MOSFET drive circuit comprises one group of logic gates, with according to rectification circuit, keep the drive signal of the output decision output of attraction circuit and initial attract current delay circuit.
The pure analog circuit of realization under voltage instantaneous trip of the present invention is after the power supply input, and through over commutation, a part of signal is through being used for sampling after the dividing potential drop, and a part is as the driving power of magnet exciting coil in addition.Sampled signal produces the copped wave control signal through the operational amplifier logical process, by the break-make of control field effect transistor or thyristor, reaches the purpose that makes armature adhesive or disjunction again.Along with input voltage raises, the copped wave duty ratio is regulated automatically, and is constant substantially to guarantee keeping electric current.
Description of drawings
The above and other features of the present invention, character and advantage will become more obvious by the description below in conjunction with drawings and Examples, in the accompanying drawings, identical Reference numeral is represented identical feature all the time, wherein:
Fig. 1 has disclosed the circuit block diagram according to the pure analog circuit of the realization under voltage instantaneous trip of one embodiment of the invention;
Fig. 2 has disclosed the circuit diagram according to the pure analog circuit of the realization under voltage instantaneous trip of one embodiment of the invention;
Fig. 3 has disclosed the control principle according to the realization under voltage instantaneous trip of one embodiment of the invention.
Embodiment
For the under voltage instantaneous trip, following demand is arranged:
When supply voltage be higher than the under-voltage release rated voltage 85% the time, control circuit guarantee to be connected magnet exciting coil, armature is by adhesive, circuit breaker is in normal operating condition; When supply voltage drop to the under-voltage release rated voltage 35%～70% the time, control circuit can select to turn-off magnet exciting coil.
Wink, the dynamic formula under-voltage release will realize two requirements in design, the one, and requirement is fast to the grid voltage change reaction speed, and the armature adhesive is stable, and threading off when under-voltage is swift in motion; Secondly also require under the normal power supply situation, during the long-time adhesive of coil, can excessive heating so that do not burn.
According to above-mentioned demand, the invention provides a kind of pure analog circuit 100 of realizing that under voltage is threaded off, with reference to shown in Figure 1, comprising:
Keep attraction circuit 104, be connected to rectification circuit, produce and keep the attraction circuit signal;
Under voltage threshold decision circuit 106 is connected to rectification circuit, judges the threshold of under voltage;
Initial attract current delay circuit 108 is connected under voltage threshold decision circuit;
MOSFET drive circuit 110, be connected to rectification circuit 102, be connected to the output of keeping attraction circuit 104 and initial attract current delay circuit 108, comprehensive rectification circuit, keep output drive signal after the output of attraction circuit and initial attract current delay circuit;
Electromagnet actuating mechanism 112 is connected to MOSFET drive circuit 110, according to the adhesive or the disjunction of drive signal control electromagnet.
In concrete circuit was realized, keeping attraction circuit can comprise:
First operational amplifier, the signal of rectification circuit is input to the negative terminal of first operational amplifier;
The first component piezoresistance;
Wherein, by adjusting the resistance of the resistance in the first component piezoresistance, it is high level that first operational amplifier is exported permanent when input voltage is lower than second predetermined value, and when input voltage is higher than second predetermined value, first operational amplifier output variable duty ratio square wave.
Under voltage threshold decision circuit can comprise:
By the filter circuit that resistance and electric capacity constitute, that the half-wave voltage signal filter of input is flat;
Second operational amplifier, the signal of rectification circuit be the anode of input second operational amplifier behind the wave circuit after filtration;
Positive feedback resistor;
Wherein, the positive feedback resistor and second operational amplifier constitute schmitt trigger, when input voltage is ascending when surpassing first predetermined value, the output generation saltus step of second operational amplifier, change high level into by low level, as long as and input voltage maintain more than second predetermined value, the output of second operational amplifier with regard to constant be high level, when input voltage drops to second predetermined value when following, the output of second operational amplifier saltus step again is low level.
Under voltage threshold decision circuit can also comprise: the second component piezoresistance, by adjusting the resistance of the resistance in the second component piezoresistance, adjust the size of first predetermined value and second predetermined value.
Initial attract current delay circuit can comprise: by the differential circuit that NAND gate, resistance and electric capacity constitute, utilize the charging interval of electric capacity to delay time.
The MOSFET drive circuit can comprise one group of logic gates, with according to rectification circuit, keep the drive signal of the output decision output of attraction circuit and initial attract current delay circuit.
With reference to figure 2, disclosed circuit diagram according to the pure analog circuit of the realization under voltage instantaneous trip of one embodiment of the invention.
At first, set two magnitudes of voltage, the first predetermined value X and the second predetermined value Y promptly when voltage is higher than the first predetermined value X, make the armature adhesive, when voltage is lower than the second predetermined value Y, armature are thrown off, and the second predetermined value Y value is less than the first predetermined value X value.
After the full-wave rectification of input power supply process, produce the input that two sampled signals are input to operational amplifier A 1 (first operational amplifier) and operational amplifier A 2 (second operational amplifier) respectively with reference to shown in Figure 2 through electric resistance partial pressure.
For operational amplifier A 1, signal is imported from negative terminal.Adjust the value of adjustable resistance R1 and R2 (resistance R 1 and R2 constitute the first component piezoresistance), make when input voltage is lower than the second predetermined value Y, operational amplifier A 1 output perseverance is a high level; When input voltage is higher than the second predetermined value Y, operational amplifier A 1 output one variable duty ratio square wave, promptly when input voltage continues to raise, the control square wave signal dutyfactor of output is all the better little, the so effective voltage at control coil two ends causes violent heating so that burn thereby make armature flows through coil under closure state electric current can not raise because of the continuation of input voltage to increase rapidly.
For operational amplifier A 2, signal is imported from anode.The filter circuit that resistance R 4 and capacitor C 1 constitute is flat with the half-wave voltage signal filter of input, and the value of adjusting R4 and capacitor C 1 can obtain smoother level signal.Positive feedback resistor R8 and operational amplifier A 2 constitute a schmitt trigger, on principle, be equivalent to a hysteresis loop comparator, when input voltage is ascending when surpassing the first predetermined value X value, saltus step takes place in operational amplifier A 2 outputs, change high level into by low level, as long as and input voltage maintains more than the second predetermined value Y, operational amplifier A 2 output with regard to constant be high level, have only when input voltage to drop to the second predetermined value Y when following, the output of operational amplifier A 2 just again saltus step be low level.Can determine to control the voltage threshold first predetermined value X and the second predetermined value Y by the value of regulating resistance R 3, R5 and R8 (resistance R 3, R5 and R8 constitute the second component piezoresistance).The control principle of this circuit as shown in Figure 3.
According to release actuating mechanism characteristic, need the electric current that keeps bigger during the initial adhesive of armature in the coil, between 200～500mA, and electric current need keep 200～400ms, to realize the adhesive action, and keep the needed coil current of attracting state less after the armature success adhesive, probably about tens milliamperes, excessive electric current will cause that coil is overheated to be burnt.So design the time need provide the electric current of 200～400ms to coil in incipient 200～400ms is moved in adhesive, the all-wave waveform that is kept perfectly of the voltage at interior loop two ends guarantees the reliable adhesive of coil during this period of time.Voltage will be cut the narrow ripple that becomes to have less pulsewidth to all-wave by copped wave subsequently, and by the electric current of coil, long-time hot-wire coil can not generate heat yet when guaranteeing adhesive.
The resistance R 6 of NAND gate G1 back constitutes a differential circuit with capacitor C 2, can utilize the charging interval of electric capacity that the power-on time interval T is provided.When input voltage is ascending when surpassing the first predetermined value X, NAND gate G3 exports high level, and the T that holds time guarantees that coil has enough pickup time.
The course of work of circuit shown in Figure 2 is as follows:
When the ascending rising of input voltage but when being lower than the first predetermined value X, operational amplifier A 2 is output as low level, the A point is a high level.NAND gate G1 exports high level, because the relation of pull-up resistor R6, the B point also is a high level, thereby the C point is a low level, not conducting of field effect transistor this moment, not adhesive of armature.
Moment when input voltage reaches the first predetermined value X, operational amplifier A 2 output high level, it is low level that NAND gate G1 exports moment, becomes high level, the field effect transistor conducting by C point behind the NAND gate G3.After the elapsed time T, the B point is because the influence of resistance R 6 becomes high level again, and power-on time finishes, and after this C dotted state is determined by operational amplifier A 1 output fully.
Operational amplifier A 1 is under the control of resistance R 2 place's threshold levels, and the signal after the full-wave rectification of input, mid portion cuts, and makes NAND gate G2 be in the gap conducting state.Input voltage is high more, and it is many more then to cut part, thereby the bigger conducting electric current of avoiding too high input voltage to cause burns coil.Regulate resistance R 2 and can control the size of this conducting electric current.
When voltage when being reduced to gradually greater than the first predetermined value X less than the second predetermined value Y, computing is put
Big device A2 output low level, the A point is a high level, the B point also is a high level, thus the C point becomes low level, and field effect transistor is turn-offed, and armature is thrown off.
The invention provides the under voltage control circuit that a kind of pure analog circuit constitutes.This circuit structure is simple, and volume is little, and working stability has higher utility.In the design, after the line voltage input, earlier through over commutation, as sampled signal, a part is as the driving power of magnet exciting coil in addition after the part process dividing potential drop.Sampled signal produces the square wave control signal with copped wave function through handling, and then by the break-make of control field effect transistor or thyristor, reaches the purpose of control armature adhesive or disjunction.
The foregoing description provides to being familiar with the person in the art and realizes or use of the present invention; those skilled in the art can be under the situation that does not break away from invention thought of the present invention; the foregoing description is made various modifications or variation; thereby protection scope of the present invention do not limit by the foregoing description, and should be the maximum magnitude that meets the inventive features that claims mention.
Claims (4)
1. a pure analog circuit of realizing that under voltage is threaded off is characterized in that, comprising:
Rectification circuit is connected to alternating current input power supplying;
Keep attraction circuit, be connected to rectification circuit, produce and keep the attraction circuit signal, the described attraction circuit of keeping comprises:
First operational amplifier, the signal of rectification circuit is input to the negative terminal of described first operational amplifier;
The first component piezoresistance;
Wherein, by adjusting the resistance of the resistance in the described first component piezoresistance, described first operational amplifier is exported the permanent high level that is when input voltage is lower than second predetermined value, and when input voltage is higher than described second predetermined value, described first operational amplifier output variable duty ratio square wave;
Under voltage threshold decision circuit is connected to rectification circuit, judges the threshold of under voltage, and described under voltage threshold decision circuit comprises:
By the filter circuit that resistance and electric capacity constitute, that the half-wave voltage signal filter of input is flat;
Second operational amplifier, the signal of rectification circuit is through the anode of described second operational amplifier of input behind the described filter circuit;
Positive feedback resistor;
Wherein, the described positive feedback resistor and second operational amplifier constitute schmitt trigger, when input voltage is ascending when surpassing first predetermined value, the output generation saltus step of second operational amplifier, change high level into by low level, as long as and input voltage maintain more than second predetermined value, the output of second operational amplifier with regard to constant be high level, when input voltage drops to second predetermined value when following, the output of second operational amplifier saltus step again is low level;
Initial attract current delay circuit is connected to described under voltage threshold decision circuit;
The MOSFET drive circuit, be connected to described rectification circuit, be connected to the described output of keeping attraction circuit and described initial attract current delay circuit, comprehensive rectification circuit, keep output drive signal after the output of attraction circuit and initial attract current delay circuit;
The electromagnet actuating mechanism is connected to described MOSFET drive circuit, according to the adhesive or the disjunction of described drive signal control electromagnet.
2. the pure analog circuit that realization under voltage as claimed in claim 1 is threaded off is characterized in that, also comprises:
The second component piezoresistance by adjusting the resistance of the resistance in the described second component piezoresistance, is adjusted the size of described first predetermined value and second predetermined value.
3. the pure analog circuit that realization under voltage as claimed in claim 1 is threaded off is characterized in that described initial attract current delay circuit comprises:
By the differential circuit that NAND gate, resistance and electric capacity constitute, utilize the charging interval of electric capacity to delay time.
4. the pure analog circuit that realization under voltage as claimed in claim 1 is threaded off, it is characterized in that, described MOSFET drive circuit comprises one group of logic gates, with according to rectification circuit, keep the drive signal of the output decision output of attraction circuit and initial attract current delay circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102073618A CN101552450B (en) | 2008-12-19 | 2008-12-19 | Pure simulation circuit for realizing undervoltage instantaneous release |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102073618A CN101552450B (en) | 2008-12-19 | 2008-12-19 | Pure simulation circuit for realizing undervoltage instantaneous release |
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| Publication Number | Publication Date |
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| CN101552450A CN101552450A (en) | 2009-10-07 |
| CN101552450B true CN101552450B (en) | 2011-06-01 |
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| CN2008102073618A Active CN101552450B (en) | 2008-12-19 | 2008-12-19 | Pure simulation circuit for realizing undervoltage instantaneous release |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102237790A (en) * | 2010-04-21 | 2011-11-09 | 鸿富锦精密工业（深圳）有限公司 | Power supply driving circuit |
| JP2014199724A (en) * | 2013-03-29 | 2014-10-23 | パナソニック株式会社 | Undervoltage tripper for circuit breaker and overvoltage/undervoltage tripper |
| CN103325633B (en) * | 2013-05-08 | 2015-03-04 | 江苏国星电器有限公司 | Electromagnetic type undervoltage release |
| CN108459248A (en) * | 2018-04-02 | 2018-08-28 | 广东电网有限责任公司 | A kind of transmission line of electricity device for detecting corona discharge |
| CN110265970B (en) * | 2019-04-17 | 2021-09-17 | 大族激光科技产业集团股份有限公司 | Equipment power supply protection circuit and control method |
| CN110706976B (en) * | 2019-10-11 | 2022-05-20 | 广东美的制冷设备有限公司 | Relay control circuit, method and electric appliance |
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| ASS | Succession or assignment of patent right |
Owner name: SHANGHAI DIANKE SCIENCE CO., LTD. Free format text: FORMER OWNER: SHANGHAI ELECTRICAL APPLIANCES SCIENCE INST. (GROUP) CO., LTD. Effective date: 20090807 |
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Effective date of registration: 20090807 Address after: No. 505, Wuning Road, Shanghai Applicant after: Shanghai Electrical Apparatus Research Institute Co., Ltd. Address before: No. 505, Wuning Road, Shanghai Applicant before: Shanghai Electrical Apparatus Research Institute (Group) Co., Ltd. |
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