CN201917624U - Leakage detection circuit - Google Patents
Leakage detection circuit Download PDFInfo
- Publication number
- CN201917624U CN201917624U CN2010205900831U CN201020590083U CN201917624U CN 201917624 U CN201917624 U CN 201917624U CN 2010205900831 U CN2010205900831 U CN 2010205900831U CN 201020590083 U CN201020590083 U CN 201020590083U CN 201917624 U CN201917624 U CN 201917624U
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- Prior art keywords
- resistance
- comparer
- capacitor
- detection circuit
- leakage detection
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- Expired - Fee Related
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The utility model discloses a leakage detection circuit which comprises a power cord LD with the voltage to be detected, a comparator IC1 used for comparing sampling voltage, and an analog/digital interface A/D used for leakage analysis; the first inverse input end of the comparator IC1 is connected with comparison voltage; the first same-phase input end of the comparator IC1 is connected with the sampling voltage; and the first output end of the comparator IC1 is connected with the analog/digital interface A/D used for analyzing whether leakage exists or not. A leakage detection power supply of the leakage detection circuit has 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 electric-leakage detection circuit.
Background technology
Existing electric-leakage detection circuit is varied of a great variety, but most complex structure, under the lower situation of some application requirements, often also be to use the electric-leakage detection circuit of labyrinth, cost can increase so on the one hand, in addition on the one hand, and after circuit structure is in a single day complicated, its labile factor is 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 omission 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:
The comparer IC1 and one that a kind of electric-leakage detection circuit, the power lead LD, that comprises a voltage to be detected are used for the comparison sampled voltage is used for the analog/digital interface A/D of analysis for current leakage;
After one shunt resistance R1 and 2 series connection of voltage sample resistance R, shunt resistance R1 end is connected on the power supply, voltage sample resistance R 2 end ground connection, and first inverting input of described comparer IC1 is connected on the link of described shunt resistance R1 and voltage sample resistance R 2;
One voltage sample resistance R, 3 one ends are connected on the described power lead LD, other end ground connection, and first in-phase input end of described comparer IC1 is connected on the link of described voltage sample resistance R 3 and described power lead LD;
After one resistance R 4 and capacitor C 1 series connection, resistance R 4 termination powers, capacitor C 1 end ground connection, first output terminal of described comparer IC1 is connected the link of described resistance R 4 and capacitor C 1 and draws a joint and is connected on the described analog/digital interface A/D;
First working power end of described comparer IC1 is connected on the power supply, the interconnected back of second output terminal of described comparer IC1, second in-phase input end, second inverting input and second working power end ground connection.
Further, also be connected with diode D1, D2, capacitor C 2, C3 on the described power lead LD, described diode D1, D2, capacitor C 2, C3 are connected with the earth terminal of described voltage sample resistance R 3.
Further, first inverting input of described comparer IC1 is also by a filter capacitor C4 ground connection.
Further, first working power end of described comparer IC1 is also by a filter capacitor C5 ground connection.
The utlity model has following advantage:
Electric-leakage detection circuit of the present utility model is simple in structure, and is 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 electric-leakage detection circuit of the present utility model.
Number in the figure explanation: 1, second output terminal of comparer IC1,2, second inverting input of comparer IC1,3, second in-phase input end of comparer IC1,4, second working power end of comparer IC1,5, first in-phase input end of comparer IC1,6, first inverting input of comparer IC1,7, first output terminal of comparer IC1,8, first working power end of comparer IC1.
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, the comparer IC1 and that a kind of electric-leakage detection circuit, the power lead LD, that comprises a voltage to be detected are used for the comparison sampled voltage is used for the analog/digital interface A/D of analysis for current leakage;
After one shunt resistance R1 and 2 series connection of voltage sample resistance R, shunt resistance R1 end is connected on the power supply, voltage sample resistance R 2 end ground connection, and first inverting input 6 of described comparer IC1 is connected on the link of described shunt resistance R1 and voltage sample resistance R 2;
One voltage sample resistance R, 3 one ends are connected on the described power lead LD, other end ground connection, and first in-phase input end 5 of described comparer IC1 is connected on the link of described voltage sample resistance R 3 and described power lead LD;
After one resistance R 4 and capacitor C 1 series connection, resistance R 4 termination powers, capacitor C 1 end ground connection, first output terminal 7 of described comparer IC1 is connected the link of described resistance R 4 and capacitor C 1 and draws a joint and is connected on the described analog/digital interface A/D;
First working power end 8 of described comparer IC1 is connected on the power supply, second output terminal 1 of described comparer IC1, second in-phase input end 3, second inverting input 2 and second working power end, 4 interconnected back ground connection.
Further, also be connected with diode D1, D2, capacitor C 2, C3 on the described power lead LD, described diode D1, D2, capacitor C 2, C3 are connected with the earth terminal of described voltage sample resistance R 3.
Further, first inverting input 6 of described comparer IC1 is also by a filter capacitor C4 ground connection.
Further, first working power end 8 of described comparer IC1 is also by a filter capacitor C5 ground connection.
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 (4)
1. the comparer IC1 and that electric-leakage detection circuit, the power lead LD, that comprises a voltage to be detected are used for the comparison sampled voltage is used for the analog/digital interface A/D of analysis for current leakage, it is characterized in that:
After one shunt resistance R1 and 2 series connection of voltage sample resistance R, shunt resistance R1 end is connected on the power supply, voltage sample resistance R 2 end ground connection, and first inverting input (6) of described comparer IC1 is connected on the link of described shunt resistance R1 and voltage sample resistance R 2;
One voltage sample resistance R, 3 one ends are connected on the described power lead LD, other end ground connection, and first in-phase input end (5) of described comparer IC1 is connected on the link of described voltage sample resistance R 3 and described power lead LD;
After one resistance R 4 and capacitor C 1 series connection, resistance R 4 termination powers, capacitor C 1 end ground connection, first output terminal (7) of described comparer IC1 is connected the link of described resistance R 4 and capacitor C 1 and draws a joint and is connected on the described analog/digital interface A/D;
First working power end (8) of described comparer IC1 is connected on the power supply, the interconnected back of second output terminal (1) of described comparer IC1, second in-phase input end (3), second inverting input (2) and second working power end (4) ground connection.
2. electric-leakage detection circuit according to claim 1 is characterized in that: also be connected with diode D1, D2, capacitor C 2, C3 on the described power lead LD, described diode D1, D2, capacitor C 2, C3 are connected with the earth terminal of described voltage sample resistance R 3.
3. electric-leakage detection circuit according to claim 1 and 2 is characterized in that: first inverting input (6) of described comparer IC1 is also by a filter capacitor C4 ground connection.
4. electric-leakage detection circuit according to claim 1 and 2 is characterized in that: first working power end (8) of described comparer IC1 is also by a filter capacitor C5 ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205900831U CN201917624U (en) | 2010-11-03 | 2010-11-03 | Leakage detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205900831U CN201917624U (en) | 2010-11-03 | 2010-11-03 | Leakage detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201917624U true CN201917624U (en) | 2011-08-03 |
Family
ID=44417418
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205900831U Expired - Fee Related CN201917624U (en) | 2010-11-03 | 2010-11-03 | Leakage detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201917624U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102043110A (en) * | 2010-11-03 | 2011-05-04 | 苏州合欣美电子科技有限公司 | Leakage current detection circuit |
| CN106443305A (en) * | 2016-11-09 | 2017-02-22 | 广东盈科电子有限公司 | Electric leakage detection circuit of alternating current and detection method |
-
2010
- 2010-11-03 CN CN2010205900831U patent/CN201917624U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102043110A (en) * | 2010-11-03 | 2011-05-04 | 苏州合欣美电子科技有限公司 | Leakage current detection circuit |
| CN106443305A (en) * | 2016-11-09 | 2017-02-22 | 广东盈科电子有限公司 | Electric leakage detection circuit of alternating current and detection method |
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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: 20110803 Termination date: 20111103 |