CN201584764U - Pulse DC current leakage protection device - Google Patents
Pulse DC current leakage protection device Download PDFInfo
- Publication number
- CN201584764U CN201584764U CN2009202842583U CN200920284258U CN201584764U CN 201584764 U CN201584764 U CN 201584764U CN 2009202842583 U CN2009202842583 U CN 2009202842583U CN 200920284258 U CN200920284258 U CN 200920284258U CN 201584764 U CN201584764 U CN 201584764U
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- detection circuit
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Abstract
The utility model provides a pulse DC current leakage protection device which is characterized by comprising a current leakage sensor, a current leakage detection circuit and a power switch unit; the current leakage sensor is used for sensing current leakage signals, converting the current signals into voltage signals, and transmitting the voltage signals to the current leakage detection circuit; the current leakage detection circuit is used for obtaining DC voltage from the received current leakage signals after filtration, amplification and rectification, and inputting the voltage to the power switch unit; and a power input unit is connected with an over-voltage detection circuit, cuts off a power supply of a protected line through the power switch unit, and effectively prevents electric shock accidents caused by current leakage.
Description
Technical field
The utility model relates to the earth leakage circuit-breaker technical field, relates in particular to a kind of earth leakage circuit-breaker pulsating direct current earth leakage protective device.
Background technology
Along with improving constantly of people's quality of life, electronics, electric equipment products have entered huge numbers of families, are also progressively strengthening for the protection person and the awareness of safety of equipment, and the requirement to protector of all kinds simultaneously also improves constantly.The present employed earth leakage circuit-breaker overwhelming majority of China is the AC type, i.e. pure sinusoid ac leakage type product, and the electronic product electric leakage comprises that not only ac leakage also comprises the pulsating direct current electric leakage, and AC type leakage switch can't play a very good protection.
Leakage switch of the prior art uses half-wave rectifying circuit can only detect ac leakage, only just can protect when ac leakage is arranged, and not have delay function, misoperation can occur.American-European countries only allows to produce A type electric leakage product at present, and the leakage switch of China is more single, can not satisfy the needs of external exported product, and is totally unfavorable to the outlet of China leakage switch producer; And China also advises using A type electric leakage product in medical industry, so A type leakage switch market potential is huge.
The utility model content
The purpose of this utility model is that the defective that exists at above-mentioned prior art provides a kind of earth leakage circuit-breaker with pulsating direct current earth leakage protective protective device, realizes that all-wave detects, and reaches the purpose of time-delay.
The technical solution of the utility model is as follows: a kind of pulsating direct current earth leakage protective device, it is characterized in that: comprise the electric leakage inductor, electric-leakage detection circuit, power input unit, power switch unit, described electric leakage inductor is used to respond to electric leakage signal and this current signal is changed into voltage signal, described voltage signal is sent to described electric-leakage detection circuit, the electric leakage signal that described electric-leakage detection circuit is used for receiving is through filtering, and amplification and rectification obtain a direct voltage and input to described power switch unit; Described power input unit links to each other with described over-voltage detection circuit, and described over-voltage detection circuit links to each other with described power switch unit, realizes cutting off the protected circuit power supply by described power switch unit.
Described pulsating direct current earth leakage protective device; wherein; described electric-leakage detection circuit comprises low pass filter; amplifier; the full-bridge rectification filter unit; first comparator; second comparator and first output unit; the output of the described electric leakage inductor of input termination of described low pass filter; be used for the filtering high-frequency interferencing signal; power frequency component is undertaken inputing to described full-bridge rectification filter unit after signal amplifies by described amplifier; by described full-bridge rectification filter unit AC signal is rectified into direct voltage and inputs to described first comparator; and described second comparator output high level voltage to the first output unit by linking to each other with described first comparator, make controllable silicon triggering and conducting in the described power switch unit by described first output unit, and make the rectifier bridge short circuit that links to each other with described controllable silicon.
Described pulsating direct current earth leakage protective device; wherein; described electric-leakage detection circuit also comprises the time-delay constant-current controller; described time-delay constant-current controller is between described first comparator and second comparator; when described first comparator was exported high level, described time-delay constant-current controller was to described second comparator positive input charging.
Described pulsating direct current earth leakage protective device; wherein; described electric-leakage detection circuit also comprises the time-delay regulon; described time-delay regulon is an external capacitor; described external capacitor one end ground connection; the positive input of described second comparator of another termination links to each other, and is used for realizing time-delay control by regulating described external capacitor appearance value.
Described pulsating direct current earth leakage protective device; wherein; described electric-leakage detection circuit also comprises an external filter circuit; described external filter circuit comprises resistance and an electric capacity; an end ground connection after described resistance and the electric capacity parallel connection; the described full-bridge rectification filter unit of another termination is used to increase the antijamming capability of circuit.
The beneficial effects of the utility model are: owing to adopted above-mentioned technical solution; by in original circuit, having increased full-bridge rectification filter circuit; making the electric leakage inductor sense the all-wave signal all can be compared device and detect; and increased the delay protection circuit, made this product can effectively prevent the electric shock accidents that causes because of electric leakage.
Description of drawings
Fig. 1 is the utility model circuit structure block diagram;
Fig. 2 is the utility model circuit connection diagram.
Embodiment
The utility model provides a kind of pulsating direct current earth leakage protective device, and is clearer, clear and definite for making the purpose of this utility model, technical scheme and advantage, below with reference to the accompanying drawing embodiment that develops simultaneously the utility model further described.
Only carry out ac leakage and detect existing problem in order to solve in the prior art in the leakage switch earth leakage protective device; the utility model has adopted full-wave rectifying circuit that leakage current is carried out all-wave and has detected; realized detection to the electric leakage of A type; and increased the delay protection function; after the protection circuit leakage current reaches set point; the output high potential triggers the controllable silicon conducting, reaches to allow control switch thread off, and a kind of protective device of effective protection power supply is provided.
In conjunction with illustrated in figures 1 and 2; the utility model pulsating direct current earth leakage protective device comprises electric leakage inductor 100; electric-leakage detection circuit 200; power switch unit 500; wherein electric-leakage detection circuit 200 comprises low pass filter 201, amplifier 202, full-bridge rectification filter unit 203, comparator 204 (comprising the first comparator OP1, the second comparator OP2); time-delay regulon 205, the time-delay constant-current controller 206 and first output unit 207.
Under the normal condition, three-phase load electric current and Ground leakage current are in a basic balance, flow through the phasor of electric leakage inductor primary winding electric current and are about zero, and promptly the total magnetic flux that is produced in iron core by it is zero, electric leakage inductor secondary coil no-output.When taking place to get an electric shock, shock current becomes the loop by the earth, that is has produced zero-sequence current.This electric current flows back to without electric leakage inductor primary winding, has destroyed balance, so the zero sequence magnetic flux is just arranged in the iron core, makes the secondary coil output signal, and the electric leakage inductor will change into voltage signal with this current signal; Electric leakage inductor (ZCT) 100 in the utility model links to each other with low pass filter 201, when power line any brings out existing Ground leakage current, electric leakage inductor ZCT changes into voltage signal with this current signal and is sent to low pass filter 201, when electric leakage is pulsating direct current, the signal that inductor produces has high-frequency harmonic, low pass filter 201 can filter this high-frequency harmonic, the utility model is owing to adopted low pass filter, when detecting electric leakage of AC type and the electric leakage of A type, the consistency of action is fine, and A type detection of electrical leakage chip does not design low pass filter in the prior art, and the production qualification rate is low, promotes the use of very difficult; The output termination amplifier 202 of low pass filter 201, amplifier 202 links to each other with full-bridge rectification filter unit 203, both are used, because the signal of low pass filter output is very weak, need signal to be amplified, by full-bridge rectification filter unit 203 this AC signal is rectified into dc level signal then, through full-bridge rectification filtering through amplifier 202, electric leakage inductor ZCT just senses, and negative signal all can be detected; The positive input of the output termination first comparator OP1 of full-bridge rectification filter unit 203, the first comparator OP1 meets reference level V1, when if the level of full-bridge rectification filter unit 203 outputs is higher than the reference level V1 of the first comparator OP1, the first comparator OP1 exports high level, by between the first comparator OP1 and the second comparator OP2, being provided with a time-delay constant-current controller 206, an i.e. constant-current source, be used for providing constant electric current to the second comparator OP2, when first comparator output high level, constant-current source charges to second comparator in-phase end; Time-delay regulon 205 is an external capacitor C6, external capacitor C6 one end ground connection, the other end links to each other with the positive input of second comparator OP2, when the positive input power supply of constant-current source to second comparator, because the effect of external capacitor C6, make the voltage of second comparator be increased to the reference level V2 of the second comparator OP2 gradually, this delay time can reach short time delay and two kinds of standards of long delay of GB 16917-2003 through the appearance value of control capacittance C6, when the voltage of capacitor C 6 is raised to the reference level V2 that is higher than the second comparator OP2, the voltage of the positive input of the second comparator OP2 is greater than reference level V2, output high level to the first output unit 207, after making controllable silicon T3 triggering and conducting in the power switch unit 500 by first output unit 207, make the rectifier bridge DCT short circuit that links to each other with controllable silicon, thereby realize the dropout of leakage switch.
Also comprise an external filter circuit in electric-leakage detection circuit 200, this external filter circuit comprises resistance R 2 and capacitor C 1, resistance R 2 and capacitor C 1 back in parallel one end ground connection, and another termination full-bridge rectification filter unit 203 is used to increase the antijamming capability of circuit.
It should be noted that, above embodiment is only unrestricted in order to the explanation the technical solution of the utility model, although the utility model is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement the technical solution of the utility model, and not breaking away from the spirit and scope of technical solutions of the utility model, it all should be encompassed in the middle of the claim scope of the present utility model.
Claims (5)
1. pulsating direct current earth leakage protective device, it is characterized in that: comprise the electric leakage inductor, electric-leakage detection circuit, power switch unit, described electric leakage inductor is used to respond to electric leakage signal and this current signal is changed into voltage signal, described voltage signal is sent to described electric-leakage detection circuit, and the electric leakage signal that described electric-leakage detection circuit is used for receiving is through filtering, and amplification and rectification obtain a direct voltage and input to described power switch unit; Described power input unit links to each other with described over-voltage detection circuit, realizes cutting off the protected circuit power supply by described power switch unit.
2. pulsating direct current earth leakage protective device according to claim 1; it is characterized in that; described electric-leakage detection circuit comprises low pass filter; amplifier; the full-bridge rectification filter unit; first comparator; second comparator and first output unit; the output of the described electric leakage inductor of input termination of described low pass filter; be used for the filtering high-frequency interferencing signal; power frequency component is undertaken inputing to described full-bridge rectification filter unit after signal amplifies by described amplifier; by described full-bridge rectification filter unit AC signal is rectified into direct voltage and inputs to described first comparator; and described second comparator output high level voltage to the first output unit by linking to each other with described first comparator; make controllable silicon triggering and conducting in the described power switch unit by described first output unit, and make the rectifier bridge short circuit that links to each other with described controllable silicon.
3. pulsating direct current earth leakage protective device according to claim 2; it is characterized in that; described electric-leakage detection circuit also comprises the time-delay constant-current controller; described time-delay constant-current controller is between described first comparator and second comparator; when described first comparator was exported high level, described time-delay constant-current controller was to described second comparator positive input charging.
4. according to claim 2 or 3 described pulsating direct current earth leakage protective devices; it is characterized in that; described electric-leakage detection circuit also comprises the time-delay regulon; described time-delay regulon is an external capacitor; described external capacitor one end ground connection; the positive input of described second comparator of another termination links to each other, and is used for realizing time-delay control by regulating described external capacitor appearance value.
5. pulsating direct current earth leakage protective device according to claim 2; it is characterized in that; described electric-leakage detection circuit also comprises an external filter circuit; described external filter circuit comprises resistance and an electric capacity; an end ground connection after described resistance and the electric capacity parallel connection; the described full-bridge rectification filter unit of another termination is used to increase the antijamming capability of circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202842583U CN201584764U (en) | 2009-12-04 | 2009-12-04 | Pulse DC current leakage protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202842583U CN201584764U (en) | 2009-12-04 | 2009-12-04 | Pulse DC current leakage protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201584764U true CN201584764U (en) | 2010-09-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202842583U Expired - Fee Related CN201584764U (en) | 2009-12-04 | 2009-12-04 | Pulse DC current leakage protection device |
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| CN (1) | CN201584764U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103036199A (en) * | 2012-12-03 | 2013-04-10 | 水利部农村电气化研究所 | Electric leakage protecting device integrated block and multi-level electric leakage protecting system comprising the same |
| CN103091544A (en) * | 2013-01-21 | 2013-05-08 | 中国人民解放军63963部队 | Direct current electric leakage detection circuit |
| CN104300494A (en) * | 2014-09-23 | 2015-01-21 | 浙江大学 | A-type leakage protector allowing leakage tripping current values to stay same |
| CN104577975A (en) * | 2013-10-21 | 2015-04-29 | 无锡华阳科技有限公司 | Electromagnetic leakage switch with time delay function |
| CN107015100A (en) * | 2017-05-04 | 2017-08-04 | 中领世能（天津）科技有限公司 | The over-pressed test circuit of electric leakage and the pressure tester that leaked electricity |
| CN107015101A (en) * | 2017-05-04 | 2017-08-04 | 中领世能（天津）科技有限公司 | Leakage testses circuit and leakage current detector |
| CN108594065A (en) * | 2018-06-27 | 2018-09-28 | 广州华铭电力科技有限公司 | A kind of voltage induced formula protection against electric shock circuit and anti-electric shock apparatus |
-
2009
- 2009-12-04 CN CN2009202842583U patent/CN201584764U/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103036199A (en) * | 2012-12-03 | 2013-04-10 | 水利部农村电气化研究所 | Electric leakage protecting device integrated block and multi-level electric leakage protecting system comprising the same |
| CN103036199B (en) * | 2012-12-03 | 2015-06-17 | 水利部农村电气化研究所 | Electric leakage protecting device integrated block and multi-level electric leakage protecting system comprising the same |
| CN103091544A (en) * | 2013-01-21 | 2013-05-08 | 中国人民解放军63963部队 | Direct current electric leakage detection circuit |
| CN103091544B (en) * | 2013-01-21 | 2015-03-25 | 中国人民解放军63963部队 | Direct current electric leakage detection circuit |
| CN104577975A (en) * | 2013-10-21 | 2015-04-29 | 无锡华阳科技有限公司 | Electromagnetic leakage switch with time delay function |
| CN104300494A (en) * | 2014-09-23 | 2015-01-21 | 浙江大学 | A-type leakage protector allowing leakage tripping current values to stay same |
| CN104300494B (en) * | 2014-09-23 | 2017-08-25 | 浙江大学 | The consistent A type earth leakage protective devices of drop-away current value of leaking electricity |
| CN107015100A (en) * | 2017-05-04 | 2017-08-04 | 中领世能（天津）科技有限公司 | The over-pressed test circuit of electric leakage and the pressure tester that leaked electricity |
| CN107015101A (en) * | 2017-05-04 | 2017-08-04 | 中领世能（天津）科技有限公司 | Leakage testses circuit and leakage current detector |
| WO2018201593A1 (en) * | 2017-05-04 | 2018-11-08 | 中领世能（天津）科技有限公司 | Leakage overvoltage test circuit, leakage overvoltage tester and test method |
| CN108594065A (en) * | 2018-06-27 | 2018-09-28 | 广州华铭电力科技有限公司 | A kind of voltage induced formula protection against electric shock circuit and anti-electric shock apparatus |
| CN108594065B (en) * | 2018-06-27 | 2024-03-05 | 广州华铭电力科技有限公司 | Voltage induction type electric shock prevention circuit and electric shock prevention device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100915 Termination date: 20181204 |