CN204347172U - A kind of electric-leakage detection circuit - Google Patents
A kind of electric-leakage detection circuit Download PDFInfo
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- CN204347172U CN204347172U CN201420818520.9U CN201420818520U CN204347172U CN 204347172 U CN204347172 U CN 204347172U CN 201420818520 U CN201420818520 U CN 201420818520U CN 204347172 U CN204347172 U CN 204347172U
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Abstract
The utility model belongs to testing circuit technical field, particularly relate to a kind of electric-leakage detection circuit, comprise input end J1, output terminal J2, buffer circuit, electric-leakage detection circuit, described buffer circuit comprises photoelectrical coupler U1, photoelectrical coupler U2, resistance R3, resistance R1, resistance R2, electric capacity C1, diode D1, the pin 1 of described photoelectrical coupler U1 connects the pin 1 of photoelectrical coupler U2, one end of electric capacity C1, the anode of diode D1, described electric-leakage detection circuit comprises amplifier U3, triode Q1, triode Q2, triode Q3, diode D3, light emitting diode D2, resistance R4, electric capacity C2, one end of the pin 1 connecting resistance R4 of described amplifier U3, one end of electric capacity C2.
Description
Technical field
The utility model belongs to testing circuit technical field, particularly relates to a kind of electric-leakage detection circuit.
Background technology
In field of switch power, especially export the power supply of high pressure, for the reason such as safe ensureing equipment and user of service, have strict restriction to leakage current, some equipment requirement should carry out detection of electrical leakage before equipment is started shooting at every turn.
Current leakage current test mainly relies on leakage current sensor, will export positive and negative two buses through leakage current sensor, if the electric current flow through on two buses is unequal, then thinks to there is electric leakage.This side does not effectively isolate with tested power supply, and this partial circuit, once lose efficacy, may cause whole power supply normally to work.
Summary of the invention
The utility model provides a kind of electric-leakage detection circuit, to solve leakage current test current in above-mentioned background technology, and the problem of effectively not isolating with tested power supply.
The technical matters that the utility model solves realizes by the following technical solutions: the utility model provides a kind of electric-leakage detection circuit, it is characterized in that: comprise input end J1, output terminal J2, buffer circuit, electric-leakage detection circuit, described buffer circuit comprises photoelectrical coupler U1, photoelectrical coupler U2, resistance R3, resistance R1, resistance R2, electric capacity C1, the pin 1 of diode D1, described photoelectrical coupler U1 connects the pin 1 of photoelectrical coupler U2, one end of electric capacity C1, the anode of diode D1, one end of its pin 2 connecting resistance R3, its pin 3 ground connection, one end of its pin 4 connecting resistance R2, the collector of triode Q1, the pin 2 of described photoelectrical coupler U2 connects the other end of electric capacity C1, the negative electrode of diode D1, the collector of triode Q3, one end of its pin 3 connecting resistance R1, the other end of its pin 4 connecting resistance R2 and meet voltage+12V, the pin 2 of another termination input end J1 of described resistance R3, pin 1 ground connection of described input end J1, the base stage of another termination triode Q1 of described resistance R1 and all ground connection, described electric-leakage detection circuit comprises amplifier U3, triode Q1, triode Q2, triode Q3, diode D3, light emitting diode D2, resistance R4, one end of the pin 1 connecting resistance R4 of electric capacity C2, described amplifier U3, one end of electric capacity C2, its pin 2 connects the other end of electric capacity C2, the emitter of triode Q1, its pin 3 connects the emitter of triode Q3, the base stage of described triode Q3 connects the anode of diode D3, the negative electrode of the negative electrode sending and receiving optical diode D2 of described diode D3 and all ground connection, the base stage of another termination triode Q2 of described resistance R4, the anode of the emitter sending and receiving optical diode D2 of described triode Q2, its collector meets output terminal J2.
Described amplifier U3 selects comparison amplifier.
Described triode Q1 selects NPN triode.
Described input end J1 selects power-supply device to be measured.
The beneficial effects of the utility model are:
The buffer circuit of 1 this patent adopts the design of two photoelectrical couplers, by testing circuit and power-supply device to be measured completely isolated, do not affect the normal work that Devices to test source-drain detects, its reliability is high, solve when main circuit once lose efficacy, the problem that whole power supply cannot normally work may be caused.
2 this patents adopt the design of diode D1 and electric capacity C1, utilizing the unilateral conduction of diode to prevent electric-leakage detection circuit damaged because re-powering formation instantaneous short circuit after the shutdown of Devices to test power supply immediately, improving reliability.
Whether the voltage that the electric-leakage detection circuit of 3 this patents is come in comparator circuit by comparison amplifier U3 is normal, and then determine whether electric leakage, and its accuracy of detection is high.
The structure of 4 this patents is simple, and circuit easily realizes, and each components and parts are relatively cheap, and low cost of manufacture, use less components and parts just can realize detection of electrical leakage, volume is little, greatly reduces costs, easy of integration, and cost performance is higher, applied range.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described further:
Embodiment:
The present embodiment comprises: input end J1, output terminal J2, buffer circuit, electric-leakage detection circuit, as shown in Figure 1.
Buffer circuit comprises photoelectrical coupler U1, photoelectrical coupler U2, resistance R3, resistance R1, resistance R2, electric capacity C1, diode D1, the pin 1 of photoelectrical coupler U1 connects the pin 1 of photoelectrical coupler U2, one end of electric capacity C1, the anode of diode D1, one end of its pin 2 connecting resistance R3, its pin 3 ground connection, one end of its pin 4 connecting resistance R2, the collector of triode Q1, the pin 2 of photoelectrical coupler U2 connects the other end of electric capacity C1, the negative electrode of diode D1, the collector of triode Q3, one end of its pin 3 connecting resistance R1, the other end of its pin 4 connecting resistance R2 and meet voltage+12V, the pin 2 of another termination input end J1 of resistance R3, pin 1 ground connection of input end J1, the base stage of another termination triode Q1 of resistance R1 and all ground connection,
Electric-leakage detection circuit comprises amplifier U3, triode Q1, triode Q2, triode Q3, diode D3, light emitting diode D2, resistance R4, electric capacity C2, one end of the pin 1 connecting resistance R4 of amplifier U3, one end of electric capacity C2, its pin 2 connects the other end of electric capacity C2, the emitter of triode Q1, its pin 3 connects the emitter of triode Q3, the base stage of triode Q3 connects the anode of diode D3, the negative electrode of the negative electrode sending and receiving optical diode D2 of diode D3 and all ground connection, the base stage of another termination triode Q2 of resistance R4, the anode of the emitter sending and receiving optical diode D2 of triode Q2, its collector meets output terminal J2.
Utilize technical scheme described in the utility model, or those skilled in the art being under the inspiration of technical solutions of the utility model, designing similar technical scheme, and reach above-mentioned technique effect, is all fall into protection domain of the present utility model.
Claims (4)
1. an electric-leakage detection circuit, is characterized in that: comprise input end J1, output terminal J2, buffer circuit, electric-leakage detection circuit, described buffer circuit comprises photoelectrical coupler U1, photoelectrical coupler U2, resistance R3, resistance R1, resistance R2, electric capacity C1, the pin 1 of diode D1, described photoelectrical coupler U1 connects the pin 1 of photoelectrical coupler U2, one end of electric capacity C1, the anode of diode D1, one end of its pin 2 connecting resistance R3, its pin 3 ground connection, one end of its pin 4 connecting resistance R2, the collector of triode Q1, the pin 2 of described photoelectrical coupler U2 connects the other end of electric capacity C1, the negative electrode of diode D1, the collector of triode Q3, one end of its pin 3 connecting resistance R1, the other end of its pin 4 connecting resistance R2 and meet voltage+12V, the pin 2 of another termination input end J1 of described resistance R3, pin 1 ground connection of described input end J1, the base stage of another termination triode Q1 of described resistance R1 and all ground connection, described electric-leakage detection circuit comprises amplifier U3, triode Q1, triode Q2, triode Q3, diode D3, light emitting diode D2, resistance R4, one end of the pin 1 connecting resistance R4 of electric capacity C2, described amplifier U3, one end of electric capacity C2, its pin 2 connects the other end of electric capacity C2, the emitter of triode Q1, its pin 3 connects the emitter of triode Q3, the base stage of described triode Q3 connects the anode of diode D3, the negative electrode of the negative electrode sending and receiving optical diode D2 of described diode D3 and all ground connection, the base stage of another termination triode Q2 of described resistance R4, the anode of the emitter sending and receiving optical diode D2 of described triode Q2, its collector meets output terminal J2.
2. a kind of electric-leakage detection circuit according to claim 1, is characterized in that: described amplifier U3 selects comparison amplifier.
3. a kind of electric-leakage detection circuit according to claim 1, is characterized in that: described triode Q1 selects NPN triode.
4. a kind of electric-leakage detection circuit according to claim 1, is characterized in that: described input end J1 selects power-supply device to be measured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420818520.9U CN204347172U (en) | 2014-12-19 | 2014-12-19 | A kind of electric-leakage detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420818520.9U CN204347172U (en) | 2014-12-19 | 2014-12-19 | A kind of electric-leakage detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204347172U true CN204347172U (en) | 2015-05-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420818520.9U Expired - Fee Related CN204347172U (en) | 2014-12-19 | 2014-12-19 | A kind of electric-leakage detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204347172U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113848366A (en) * | 2021-08-10 | 2021-12-28 | 广东朝阳电子科技股份有限公司 | Shutdown leakage current detection circuit |
-
2014
- 2014-12-19 CN CN201420818520.9U patent/CN204347172U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113848366A (en) * | 2021-08-10 | 2021-12-28 | 广东朝阳电子科技股份有限公司 | Shutdown leakage current detection circuit |
| CN113848366B (en) * | 2021-08-10 | 2023-07-18 | 广东朝阳电子科技股份有限公司 | Shutdown leakage current detection circuit |
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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 |
Granted publication date: 20150520 Termination date: 20151219 |
|
| EXPY | Termination of patent right or utility model |