CN203278180U - Simple electronic backup protective device of alternate current breaker - Google Patents
Simple electronic backup protective device of alternate current breaker Download PDFInfo
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- CN203278180U CN203278180U CN 201320265526 CN201320265526U CN203278180U CN 203278180 U CN203278180 U CN 203278180U CN 201320265526 CN201320265526 CN 201320265526 CN 201320265526 U CN201320265526 U CN 201320265526U CN 203278180 U CN203278180 U CN 203278180U
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Abstract
The utility model relates to a simple electronic backup protective device of an alternate current breaker. The device comprises input terminals of three current transformers, three rectifier bridges, ten resistors, an electrolytic capacitor, a voltage-stabilizing tube, an operational amplifier AR1, an operational amplifier AR2, a triode Q1 and an execution magnetic flux M1. When a current that flows through one or more of the three current transformers is greater than the preset short-circuit current, a sensing current is rectified by the three rectifier bridges, passes through three resistors, generates a negative signal at the non-ground end of the resistors, then passes through another resistor to enter the operational amplifier AR1 to be amplified in a manner of opposite phase and scaling, and then is connected with the normal phase input end of the operational amplifier AR2 via the output end of the operational amplifier AR1. At this time, amplitude of the signal is greater than the reference voltage value between another two resistors, and the operational amplifier AR2 outputs a high voltage and carries out a magnetic flux action to break off the breaker. The circuit is simple in structure, high in stability, low in cost, reliable in short-circuit protection function, so that time of a short-circuit breaking protection action of an electronic intelligent breaker is greatly reduced.
Description
Technical field
The utility model belongs to a kind of alternating current circuit current protecting circuit, particularly relates to a kind of easy AC circuit breaker electronic type backup protection equipment.
Background technology
Along with electronic technology is widely used in rapidly in various fields, the current protector of alternating current circuit has also developed out the electronic type intelligent breaker by the magnetothermal circuit breaker.But have at present a general phenomenon to be: the electronic type intelligent breaker is better than the magnetothermal circuit breaker really greatly on the protection precision; but with regard to the disjunction protection speed of short circuit current, the electronic type intelligent breaker generally will be slower than the magnetothermal circuit breaker.Mainly from current transformer due to the current signal that gathers in the electronic type intelligent breaker, this signal need be through after the sampling processing of single-chip microcomputer, just can make the judgement of whether moving, this process need a period of time, but the magnetothermal circuit breaker does not need this process.Because the short circuit breaking guard time is related to the height of circuit breaker breaking capacity greatly, so a lot of electronic type intelligent breaker can not break away from the restriction of magnetothermal protection fully, has often just substituted hot protection, but must stay the magnetic protection.Some circuit breaker has also added corresponding electronic type backup protection circuit in design, but its complex structure uses electronic devices and components more, and its stability that components and parts are many is just relatively low, causes some protection precision not enough.
Summary of the invention
The utility model provides a kind of simple in structure, easy AC circuit breaker electronic type backup protection equipment that volume is small and exquisite for solving the technical problem that exists in known technology.
The technical scheme that the utility model is taked for the technical problem that exists in the solution known technology is: it includes first, second and third current transformer (CT1, CT2, CT3) signal input terminal, first, second and third rectifier bridge (D1, D2, D3), first--the tenth resistance (R1-R10), electrochemical capacitor (C1), voltage-stabiliser tube (D4), first and second operational amplifier (AR1, AR2), triode (Q1) and execution magnetic flux (M1);
No. 1 pin of described the first rectifier bridge of one side joint of the signal input terminal of described the first current transformer (CT1) (D1), No. 3 pin of described the first rectifier bridge of another side joint of the signal input terminal of described the first current transformer (CT1) (D1); No. 1 pin of described the second rectifier bridge of one side joint of the signal input terminal of described the second current transformer (CT2) (D2), No. 3 pin of described the second rectifier bridge of another side joint of the signal input terminal of described the second current transformer (CT2) (D2); No. 1 pin of described the 3rd rectifier bridge of one side joint of the signal input terminal of described the 3rd current transformer (CT3) (D3), No. 3 pin of described the 3rd rectifier bridge of another side joint of the signal input terminal of described the 3rd current transformer (CT3) (D3); One end of one end of described the second resistance of one termination of described the first resistance (R1) (R2) and described the 3rd resistance (R3), GND end for native system, No. 4 pin of described the first rectifier bridge of another termination of described the first resistance (R1) (D1), No. 4 pin of described the second rectifier bridge of another termination of described the second resistance (R2) (D2), No. 4 pin of described the 3rd rectifier bridge of another termination of described the 3rd resistance (R3) (D3); No. 2 pin of No. 2 pin of described the first rectifier bridge (D1) and described the second rectifier bridge (D2) and No. 2 pin of described the 3rd rectifier bridge (D3) are all received an end of described the 4th resistance (R4), the anode of another termination electrochemical capacitor (C1) of described the 4th resistance (R4) is the VCC of native system; No. 4 pin of No. 4 pin of described the first rectifier bridge (D1) and described the second rectifier bridge (D2) and No. 4 pin of described the 3rd rectifier bridge (D3) are all received an end of described the 7th resistance (R7), the negative-phase input of described the first operational amplifier of another termination of described the 7th resistance (R7) (AR1); The negative electrode of the positive termination voltage-stabiliser tube (D4) of electrochemical capacitor (C1) and an end of described the 5th resistance (R5), the negative-phase input of described the 6th resistance of another termination of described the 5th resistance (R5) (R6) and described the second operational amplifier (AR2); The negative pole that the anode of voltage-stabiliser tube (D4) connects electrochemical capacitor (C1) meets GND; The negative-phase input of described the second operational amplifier of one termination of described the 6th resistance (R6) (AR2), another termination GND of described the 6th resistance (R6); The negative-phase input of described the first operational amplifier of one termination of described the 8th resistance (R8) (AR1), the normal phase input end of described the second operational amplifier of the output termination of described the first operational amplifier of another termination of described the 8th resistance (R8) (AR1) (AR2); The normal phase input end of described the first operational amplifier of one termination of described the 9th resistance (R9) (AR1), another termination GND of described the 9th resistance (R9); The output of described the second operational amplifier of one termination of described the tenth resistance (R10) (AR2), the base stage of the described triode of another termination (Q1) of described the tenth resistance (R10); The VCC pin of described the first operational amplifier (AR1) meets the VCC of the VCC pin welding system of described the second operational amplifier (AR2); The VSS pin of described the first operational amplifier (AR1) meets the GND of the VSS pin welding system of described the second operational amplifier (AR2); One termination VCC of described execution magnetic flux (M1), the collector electrode of the described triode of another termination of described execution magnetic flux (M1)-(Q1); The emitter of described triode (Q1) meets GND.
Advantage and the good effect that the utlity model has are: circuit structure is simple, and stability is strong, and cost is lower, and short-circuit protection function is reliable, has improved greatly the short circuit breaking operate time of protection of electronic type intelligent breaker.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
For further understanding summary of the invention of the present utility model, Characteristic, hereby exemplify following examples, and coordinate accompanying drawing to be described in detail as follows:
As shown in Figure 1, No. 1 pin of a side joint rectifier bridge D1 of Current Transmit 1, No. 3 pin of another side joint rectifier bridge D1 of Current Transmit 1; No. 1 pin of one side joint rectifier bridge D2 of Current Transmit 2, No. 3 pin of another side joint rectifier bridge D2 of Current Transmit 2; No. 1 pin of one side joint rectifier bridge D3 of Current Transmit 3, No. 3 pin of another side joint rectifier bridge D3 of Current Transmit 3; The end of one terminating resistor R2 of resistance R 1 and an end of resistance R 3 are the GND end of native system, No. 4 pin of another termination rectifier bridge D1 of resistance R 1, No. 4 pin of another termination rectifier bridge D2 of resistance R 2, No. 4 pin of another termination rectifier bridge D3 of resistance R 3; No. 2 pin of No. 2 pin of rectifier bridge D1 and rectifier bridge D2 and No. 2 pin of rectifier bridge D3 are all received an end of resistance R 4, and the anode of another termination electrochemical capacitor C1 of resistance R 4 is the VCC of native system; No. 4 pin of No. 4 pin of rectifier bridge D1 and rectifier bridge D2 and No. 4 pin of rectifier bridge D3 are all received an end of resistance R 7, the negative-phase input of another termination operational amplifier A R1 of resistance R 7; The negative electrode of the positive termination voltage-stabiliser tube D4 of electrochemical capacitor C1 and an end of resistance R 5, another termination the 6th resistance R 6 of resistance R 5 and the negative-phase input of operational amplifier A R2; The negative pole that the anode of voltage-stabiliser tube D4 meets electrochemical capacitor C1 meets GND; The negative-phase input of one termination operational amplifier A R2 of resistance R 6, another termination GND of resistance R 6; The negative-phase input of one termination operational amplifier A R1 of resistance R 8, the normal phase input end of the output termination operational amplifier A R2 of another termination operational amplifier A R1 of resistance R 8; The normal phase input end of one termination operational amplifier A R1 of resistance R 9, another termination GND of resistance R 9; The output of one termination operational amplifier A R2 of resistance R 10, the base stage of another termination triode Q1 of resistance R 10; The VCC pin of operational amplifier A R1 meets the VCC of the VCC pin welding system of operational amplifier A R2; The VSS pin of operational amplifier A R1 meets the GND of the VSS pin welding system of operational amplifier A R2; Carry out the termination VCC of magnetic flux M1, carry out the collector electrode of another termination triode Q1 of magnetic flux; The emitter of triode Q1 meets GND.
Operation principle is: the electric current that Current Transmit 1, CT2, CT3 induce is after process rectifier bridge D1, D2, D3 rectification, through the positive pole of resistance R 4 to electrochemical capacitor C1 and the negative electrode of voltage-stabiliser tube D4, press VCC through producing a galvanic current after the voltage stabilizing of voltage-stabiliser tube, produce a stable voltage after this direct voltage process resistance R 5, R6 between resistance R 5 and resistance R 6, this magnitude of voltage is received the negative-phase input of operational amplifier A R2 as fiducial value.
Under normal circumstances, the electric current that flows through in Current Transmit 1, CT2, CT3 is less than the setting electric current of short-circuit protection, its electric current that induces is after process rectifier bridge D1, D2, D3 rectification, hold negative signal of generation at the non-GND of R1, R2, R3 after flowing through resistance R 1, R2, R3, this negative signal enters operational amplifier A R1 through resistance R 7 and carries out anti-phase ratio amplification, multiplication factor is resistance R 8 and the ratio of R7, after anti-phase amplification through the normal phase input end of the output termination operational amplifier A R2 of operational amplifier A R1; At this moment, the amplitude of signal is less than the reference voltage value between resistance R 5 and resistance R 6, and the output output LOW voltage of operational amplifier A R2 is carried out magnetic flux and is failure to actuate, and circuit breaker does not disconnect.
Any a certain phase or more than the electric current of a phase during greater than the short-circuit current value set in flow through three Current Transmits 1, CT2, CT3, its electric current that induces is after process rectifier bridge D1, D2, D3 rectification, hold negative signal of generation at the non-GND of R1, R2, R3 after flowing through resistance R 1, R2, R3, this negative signal enters operational amplifier A R1 through resistance R 7 and carries out anti-phase ratio amplification, multiplication factor is resistance R 8 and the ratio of R7, after anti-phase amplification through the normal phase input end of the output termination operational amplifier A R2 of operational amplifier A R1; At this moment, the amplitude of signal is greater than the reference voltage value between resistance R 5 and resistance R 6, and the output output HIGH voltage of operational amplifier A R2 is carried out the magnetic flux action, and circuit breaker disconnects at once.
Claims (1)
1. easy AC circuit breaker electronic type backup protection equipment, it is characterized in that: it includes first, second and third current transformer (CT1, CT2, CT3) signal input terminal, first, second and third rectifier bridge (D1, D2, D3), first--the tenth resistance (R1-R10), electrochemical capacitor (C1), voltage-stabiliser tube (D4), first and second operational amplifier (AR1, AR2), triode (Q1) and execution magnetic flux (M1);
No. 1 pin of described the first rectifier bridge of one side joint of the signal input terminal of described the first current transformer (CT1) (D1), No. 3 pin of described the first rectifier bridge of another side joint of the signal input terminal of described the first current transformer (CT1) (D1); No. 1 pin of described the second rectifier bridge of one side joint of the signal input terminal of described the second current transformer (CT2) (D2), No. 3 pin of described the second rectifier bridge of another side joint of the signal input terminal of described the second current transformer (CT2) (D2); No. 1 pin of described the 3rd rectifier bridge of one side joint of the signal input terminal of described the 3rd current transformer (CT3) (D3), No. 3 pin of described the 3rd rectifier bridge of another side joint of the signal input terminal of described the 3rd current transformer (CT3) (D3); One end of one end of described the second resistance of one termination of described the first resistance (R1) (R2) and described the 3rd resistance (R3), GND end for native system, No. 4 pin of described the first rectifier bridge of another termination of described the first resistance (R1) (D1), No. 4 pin of described the second rectifier bridge of another termination of described the second resistance (R2) (D2), No. 4 pin of described the 3rd rectifier bridge of another termination of described the 3rd resistance (R3) (D3); No. 2 pin of No. 2 pin of described the first rectifier bridge (D1) and described the second rectifier bridge (D2) and No. 2 pin of described the 3rd rectifier bridge (D3) are all received an end of described the 4th resistance (R4), the anode of another termination electrochemical capacitor (C1) of described the 4th resistance (R4) is the VCC of native system; No. 4 pin of No. 4 pin of described the first rectifier bridge (D1) and described the second rectifier bridge (D2) and No. 4 pin of described the 3rd rectifier bridge (D3) are all received an end of described the 7th resistance (R7), the negative-phase input of described the first operational amplifier of another termination of described the 7th resistance (R7) (AR1); The negative electrode of the positive termination voltage-stabiliser tube (D4) of electrochemical capacitor (C1) and an end of described the 5th resistance (R5), the negative-phase input of described the 6th resistance of another termination of described the 5th resistance (R5) (R6) and described the second operational amplifier (AR2); The negative pole that the anode of voltage-stabiliser tube (D4) connects electrochemical capacitor (C1) meets GND; The negative-phase input of described the second operational amplifier of one termination of described the 6th resistance (R6) (AR2), another termination GND of described the 6th resistance (R6); The negative-phase input of described the first operational amplifier of one termination of described the 8th resistance (R8) (AR1), the normal phase input end of described the second operational amplifier of the output termination of described the first operational amplifier of another termination of described the 8th resistance (R8) (AR1) (AR2); The normal phase input end of described the first operational amplifier of one termination of described the 9th resistance (R9) (AR1), another termination GND of described the 9th resistance (R9); The output of described the second operational amplifier of one termination of described the tenth resistance (R10) (AR2), the base stage of the described triode of another termination (Q1) of described the tenth resistance (R10); The VCC pin of described the first operational amplifier (AR1) meets the VCC of the VCC pin welding system of described the second operational amplifier (AR2); The VSS pin of described the first operational amplifier (AR1) meets the GND of the VSS pin welding system of described the second operational amplifier (AR2); One termination VCC of described execution magnetic flux (M1), the collector electrode of the described triode of another termination of described execution magnetic flux (M1)-(Q1); The emitter of described triode (Q1) meets GND.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320265526 CN203278180U (en) | 2013-05-16 | 2013-05-16 | Simple electronic backup protective device of alternate current breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320265526 CN203278180U (en) | 2013-05-16 | 2013-05-16 | Simple electronic backup protective device of alternate current breaker |
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| Publication Number | Publication Date |
|---|---|
| CN203278180U true CN203278180U (en) | 2013-11-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320265526 Withdrawn - After Issue CN203278180U (en) | 2013-05-16 | 2013-05-16 | Simple electronic backup protective device of alternate current breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203278180U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103236679A (en) * | 2013-05-16 | 2013-08-07 | 天津市百利电气有限公司 | Electronic type backup protection device for AC (alternating current) circuit breaker |
-
2013
- 2013-05-16 CN CN 201320265526 patent/CN203278180U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103236679A (en) * | 2013-05-16 | 2013-08-07 | 天津市百利电气有限公司 | Electronic type backup protection device for AC (alternating current) circuit breaker |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20131106 Effective date of abandoning: 20160601 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |