CN201876512U - Circuit leakage current detecting circuit - Google Patents
Circuit leakage current detecting circuit Download PDFInfo
- Publication number
- CN201876512U CN201876512U CN2010205901726U CN201020590172U CN201876512U CN 201876512 U CN201876512 U CN 201876512U CN 2010205901726 U CN2010205901726 U CN 2010205901726U CN 201020590172 U CN201020590172 U CN 201020590172U CN 201876512 U CN201876512 U CN 201876512U
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- comparer
- resistance
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Abstract
The utility model discloses a circuit leakage current detecting circuit comprising a single-row needle bed J1, a third pin of the single-row needle bed J1 is connected with the first input end of a transformer T, the second input end of the transformer T is connected with a collector of a triode Q1 through a resistor R2, an emitter of the triode Q1 is grounded, a base of the triode Q1 is connected with a first pin of the single-row needle bed J1 through a resistor R1, the first output end of the transformer T is connected with an adjustable resistor R3 which is connected with the inverting input end of a comparator OP1, the output end of the comparator OP1 is also connected with the non-inverting input end of a comparator OP2, and the output end of the comparator OP2 is connected to a second pin of the single-row needle bed J1 through a resistor R7. The circuit leakage current detecting circuit has a simple structure and is convenient to use.
Description
Technical field
The utility model relates to a kind of application circuit, is specifically related to a kind of circuit leakage current testing circuit.
Background technology
Existing circuit leakage current testing circuit is varied of a great variety, but most complex structure, the function complexity, and only need under the application scenario of function singleness at some, adopt the leakage current testing circuit of complicated circuit construction to finish the phase-detection function of simple function often, cost can increase so on the one hand, in addition on the one hand, after circuit structure was in a single day complicated, its labile factor was behind so just reducing product percent of pass virtually also increasing.
The utility model content
For overcoming deficiency of the prior art, the purpose of this utility model is to provide a kind of leakage current testing circuit simple in structure.
In order to solve the problems of the technologies described above, realize above-mentioned purpose, the utility model has adopted following technical scheme:
A kind of circuit leakage current testing circuit, comprise a single needle stand J1, the 5th pin of described single needle stand J1 connects power supply, the 4th pin ground connection of described single needle stand J1, the 3rd pin of described single needle stand J1 connects the first input end of a transformer T, second input end of described transformer T connects the collector of triode Q1 by a resistance R 2, the grounded emitter of described triode Q1, the base stage of described triode Q1 connects first pin of described single needle stand J1 by a resistance R 1, second output head grounding of described transformer T, the first output termination, the one adjustable resistance R3 of described transformer T, described adjustable resistance R3 connects the inverting input of a comparer OP1, the in-phase input end ground connection of described comparer OP1, cross-over connection one resistance R 4 between the output terminal of described comparer OP1 and the inverting input, the output terminal of described comparer OP1 also connects the in-phase input end of another comparer OP2, the inverting input of described comparer OP2 is connected on the electronegative potential resistance R 6, described electronegative potential resistance R 6 one end ground connection, the other end connects power supply by a noble potential resistance R 5, and described comparer OP2 output terminal is connected to second pin of described single needle stand J1 by a resistance R 7.
Further, cross-over connection has polar capacitor C1 between the in-phase input end of described comparer OP1 and the inverting input.
Further, cross-over connection has filter capacitor C2 between described comparer OP1 output terminal and the identical input end.
The course of work of phase detecting circuit of the present utility model is as follows:
Change the size of leakage current by the adjusting of adjustable resistance R3.The output end signal of comparer OP1 passes through the inverting input that resistance R 4 feeds back to comparer OP1, by in-phase input end pin and the inverting input comparison of comparer OP1.The signal of the output terminal of comparer OP1 is given the in-phase input end of comparer OP2 through 2 filtering of filtering capacitor C simultaneously, comes by the in-phase input end of comparer OP2 and the signal of inverting input collection more whether electric leakage is arranged again.Whether described three row-needle receptacles, the first pin high-low level detects transformer T fault.
The utlity model has following advantage:
Circuit leakage current testing circuit of the present utility model is simple in structure, easy to use.
Above-mentioned explanation only is the general introduction of technical solutions of the utility model, for can clearer understanding technological means of the present utility model, and can be implemented according to the content of instructions, below with preferred embodiment of the present utility model and conjunction with figs. describe in detail as after.Embodiment of the present utility model is provided in detail by following examples and accompanying drawing thereof.
Description of drawings
Fig. 1 is the circuit theory diagrams of circuit leakage current testing circuit of the present utility model.
Embodiment
Below in conjunction with drawings and Examples technology implementation process of the present utility model is described further.
Referring to shown in Figure 1, a kind of circuit leakage current testing circuit, comprise a single needle stand J1, the 5th pin 5 of described single needle stand J1 connects power supply, the 4th pin 4 ground connection of described single needle stand J1, the 3rd pin 3 of described single needle stand J1 connects the first input end of a transformer T, second input end of described transformer T connects the collector of triode Q1 by a resistance R 2, the grounded emitter of described triode Q1, the base stage of described triode Q1 connects first pin 1 of described single needle stand J1 by a resistance R 1, second output head grounding of described transformer T, the first output termination, the one adjustable resistance R3 of described transformer T, described adjustable resistance R3 connects the inverting input of a comparer OP1, the in-phase input end ground connection of described comparer OP1, cross-over connection one resistance R 4 between the output terminal of described comparer OP1 and the inverting input, the output terminal of described comparer OP1 also connects the in-phase input end of another comparer OP2, the inverting input of described comparer OP2 is connected on the electronegative potential resistance R 6, described electronegative potential resistance R 6 one end ground connection, the other end connects power supply by a noble potential resistance R 5, and described comparer OP2 output terminal is connected to second pin 2 of described single needle stand J1 by a resistance R 7.
Further, cross-over connection has polar capacitor C1 between the in-phase input end of described comparer OP1 and the inverting input.
Further, cross-over connection has filter capacitor C2 between described comparer OP1 output terminal and the identical input end.
The foregoing description just is to allow the one of ordinary skilled in the art can understand content of the present utility model and enforcement according to this for technical conceive of the present utility model and characteristics being described, its objective is, can not limit protection domain of the present utility model with this.The variation or the modification of every equivalence of having done according to the essence of the utility model content all should be encompassed in the protection domain of the present utility model.
Claims (3)
1. circuit leakage current testing circuit, comprise a single needle stand J1, the 5th pin (5) of described single needle stand J1 connects power supply, the 4th pin (4) ground connection of described single needle stand J1, the 3rd pin (3) of described single needle stand J1 connects the first input end of a transformer T, second input end of described transformer T connects the collector of triode Q1 by a resistance R 2, the grounded emitter of described triode Q1, the base stage of described triode Q1 connects first pin (1) of described single needle stand J1 by a resistance R 1, it is characterized in that: second output head grounding of described transformer T, the first output termination, the one adjustable resistance R3 of described transformer T, described adjustable resistance R3 connects the inverting input of a comparer OP1, the in-phase input end ground connection of described comparer OP1, cross-over connection one resistance R 4 between the output terminal of described comparer OP1 and the inverting input, the output terminal of described comparer OP1 also connects the in-phase input end of another comparer OP2, the inverting input of described comparer OP2 is connected on the electronegative potential resistance R 6, described electronegative potential resistance R 6 one end ground connection, the other end connects power supply by a noble potential resistance R 5, and described comparer OP2 output terminal is connected to second pin (2) of described single needle stand J1 by a resistance R 7.
2. circuit leakage current testing circuit according to claim 1 is characterized in that: cross-over connection has polar capacitor C1 between the in-phase input end of described comparer OP1 and the inverting input.
3. circuit leakage current testing circuit according to claim 2 is characterized in that: cross-over connection has filter capacitor C2 between described comparer OP1 output terminal and the identical input end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205901726U CN201876512U (en) | 2010-11-03 | 2010-11-03 | Circuit leakage current detecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205901726U CN201876512U (en) | 2010-11-03 | 2010-11-03 | Circuit leakage current detecting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201876512U true CN201876512U (en) | 2011-06-22 |
Family
ID=44164428
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205901726U Expired - Fee Related CN201876512U (en) | 2010-11-03 | 2010-11-03 | Circuit leakage current detecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201876512U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102012475A (en) * | 2010-11-03 | 2011-04-13 | 苏州合欣美电子科技有限公司 | Leakage current detection circuit of circuit |
| CN104979911A (en) * | 2015-07-17 | 2015-10-14 | 国网山西省电力公司大同供电公司 | Remote monitoring system for transformer |
-
2010
- 2010-11-03 CN CN2010205901726U patent/CN201876512U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102012475A (en) * | 2010-11-03 | 2011-04-13 | 苏州合欣美电子科技有限公司 | Leakage current detection circuit of circuit |
| CN104979911A (en) * | 2015-07-17 | 2015-10-14 | 国网山西省电力公司大同供电公司 | Remote monitoring system for transformer |
| CN104979911B (en) * | 2015-07-17 | 2017-09-26 | 国网山西省电力公司大同供电公司 | A kind of remote monitoring system for transformer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110622 Termination date: 20111103 |