CN102761097A - Direct current leakage protective circuit - Google Patents
Direct current leakage protective circuit Download PDFInfo
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- CN102761097A CN102761097A CN2012102387842A CN201210238784A CN102761097A CN 102761097 A CN102761097 A CN 102761097A CN 2012102387842 A CN2012102387842 A CN 2012102387842A CN 201210238784 A CN201210238784 A CN 201210238784A CN 102761097 A CN102761097 A CN 102761097A
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Abstract
The invention relates to a direct current leakage protective circuit. The direct current leakage protective circuit comprises a detection circuit used for detecting the inflow and outflow electric current difference signals of positive and negative wires of a direct-current output end, wherein an output end of the detection circuit is connected with an input end of a comparison circuit through an amplifying circuit; and an output end of the comparison circuit is connected with a load R through an execution circuit, and the detection circuit adopts a hall current sensor. The direct current leakage protective circuit adopts the hall current sensor to detect, and guarantees the precision and isolation of a circuit; the amplifying circuit adopts an operational amplifier to amplify the electric current difference value, and the comparison circuit judges the leakage condition; when a leakage current is higher than a set value of 30 mA ( human body safe current), and the execution circuit cuts off a direct current system so as to alarm; the utilized components are less, the structure is simple, and the hall current sensor is adopted to improve the precision of a system; and the malfunction probability is greatly reduced, and the reliability is higher.
Description
Technical field
The present invention relates to a kind of direct current leakage protection circuit.
Background technology
At present, the range of application of DC power-supply system is wider, and DC power-supply system can insulate when impaired at circuit, avoids taking place leaky, with assurance system and personnel's safety.Usually, all be to select earth leakage protective device for use, the sensitivity of this earth leakage protective device is low, and used components and parts are more, directly caused the increase of circuit malfunction rate and reliability to reduce.
Summary of the invention
The object of the present invention is to provide the direct current leakage protection circuit that a kind of circuit structure is simple, reliability is high.
For realizing above-mentioned purpose; The present invention has adopted following technical scheme: a kind of direct current leakage protection circuit; Comprise that being used to detect the positive negative conductor of dc output end flows into and the testing circuit that flows out current difference signal; The output of testing circuit links to each other with the input of comparison circuit through amplifying circuit, and the output of comparison circuit links to each other with load R through executive circuit, and described testing circuit adopts Hall current sensor.
Can know by technique scheme; The present invention adopts Hall current sensor to detect, and has guaranteed the isolation of precision and circuit, and amplifying circuit adopts amplifier that the electric current difference is amplified; Judge the situation of electric leakage then through comparison circuit; When leakage current is higher than set point 30mA (human body safe current), cuts off the power supply of direct current system through executive circuit, and report to the police.The components and parts that the present invention uses are less, simple in structure, and adopt Hall current sensor to improve the precision of system, and greatly reduce the probability that breaks down, and reliability is higher.
Description of drawings
Fig. 1 is a circuit diagram of the present invention.
Embodiment
A kind of direct current leakage protection circuit; Comprise that being used to detect the positive negative conductor of dc output end flows into and the testing circuit 1 that flows out current difference signal; The output of testing circuit 1 links to each other with the input of comparison circuit 3 through amplifying circuit 2; The output of comparison circuit 3 links to each other with load R through executive circuit 4, and described testing circuit 1 adopts Hall current sensor 5.The positive negative conductor of described dc output end links to each other with the moving contact of contactor K, and the fixed contact of contactor K links to each other with load R, and described Hall current sensor 5 is set on the lead between contactor K and the load R through its wire guide 5a.
As shown in Figure 1; Described Hall current sensor 5 adopts the CSNF161 chip; Its 1st pin connects+the 12V direct current, and its 3rd pin connects-the 12V direct current, and its 2nd pin links to each other with the end of resistance R 1, R2 respectively; The other end ground connection of resistance R 1, the other end of resistance R 2 links to each other with the input of amplifying circuit 2.Described amplifying circuit 2 comprises amplifier LM158B; Its inverting input links to each other with the output of testing circuit 1; Its normal phase input end is through resistance R 3 ground connection, and its output links to each other with the input of comparison circuit 3, and resistance R 4 is connected across between the inverting input and output of amplifier LM158B.
As shown in Figure 1; Described comparison circuit 3 comprises amplifier LM158A; Its inverting input links to each other with the end of resistance R 6, R7 respectively, another termination+12V direct current of resistance R 6, the other end ground connection of resistance R 7; The normal phase input end of amplifier LM158A links to each other with the output of amplifying circuit 2 through resistance R 5, and the output of amplifier LM158A links to each other with the input of executive circuit 4.Described executive circuit 4 comprises the pull-in winding of resistance R 8 and contactor K; The output of comparison circuit 3 links to each other with an end of resistance R 8, the pull-in winding of contactor K respectively; The other end of resistance R 8 links to each other with the anode of LED, the minus earth of LED.
When work; At first the Hall current sensor 5 of testing circuit 1 detects the positive negative conductor inflow and the difference that flows out electric current of direct current system; This difference is amplified through the amplifier LM158B of amplifying circuit 2; Signal after amplifying is then given the amplifier LM158A of comparison circuit 3, and signal after amplifier LM158A will amplify and set point (human body safe current 30mA) are done comparison.Set point is according to amplifier, i.e. the voltage signal that comes out of amplifier LM158B, and this is worth 40 times for original leakage current after amplifier is amplified, and then compares with reference voltage, and reference voltage obtains through resistance R 6, R7 dividing potential drop.When leakage current surpassed set point, comparison circuit 3 outputed signal to executive circuit 4 and cuts off DC power-supply system, and reports to the police through LED.Detect the dc output end common mode current through Hall current sensor 5 and judged whether leakage current; When having ohmic leakage between ac line, monitor leakage current in real time, when leakage current surpasses human body safe current 30mA; The bright warning of LED lamp, the contactor K of shutoff DC side.
In a word; The present invention utilizes highdensity Hall current sensor 5 to detect the positive negative conductor of a certain direct current and flows into and outflow electric current difference, judges the insulation leakagel volume leakage situation of load R, detects to have very high sensitivity; The present invention need not to inject signal to system; Need not to carry out any electrical link, guaranteed that so the electric amount of having no adds in the direct current system to be detected, thereby reached the insulating reliability of system to be detected with system.
Claims (6)
1. direct current leakage protection circuit; It is characterized in that: comprise that being used to detect the positive negative conductor of dc output end flows into and the testing circuit (1) that flows out current difference signal; The output of testing circuit (1) links to each other with the input of comparison circuit (3) through amplifying circuit (2); The output of comparison circuit (3) links to each other with load R through executive circuit (4), and described testing circuit (1) adopts Hall current sensor (5).
2. direct current leakage protection circuit according to claim 1; It is characterized in that: the positive negative conductor of described dc output end links to each other with the moving contact of contactor K; The fixed contact of contactor K links to each other with load R, and described Hall current sensor (5) is set on the lead between contactor K and the load R through its wire guide (5a).
3. direct current leakage protection circuit according to claim 2; It is characterized in that: described Hall current sensor (5) adopts the CSNF161 chip; Its 1st pin connects+the 12V direct current, and its 3rd pin connects-the 12V direct current, and its 2nd pin links to each other with the end of resistance R 1, R2 respectively; The other end ground connection of resistance R 1, the other end of resistance R 2 links to each other with the input of amplifying circuit (2).
4. direct current leakage protection circuit according to claim 1; It is characterized in that: described amplifying circuit (2) comprises amplifier LM158B; Its inverting input links to each other with the output of testing circuit (1); Its normal phase input end is through resistance R 3 ground connection, and its output links to each other with the input of comparison circuit (3), and resistance R 4 is connected across between the inverting input and output of amplifier LM158B.
5. direct current leakage protection circuit according to claim 1; It is characterized in that: described comparison circuit (3) comprises amplifier LM158A; Its inverting input links to each other with the end of resistance R 6, R7 respectively, another termination+12V direct current of resistance R 6, the other end ground connection of resistance R 7; The normal phase input end of amplifier LM158A links to each other with the output of amplifying circuit (2) through resistance R 5, and the output of amplifier LM158A links to each other with the input of executive circuit (4).
6. direct current leakage protection circuit according to claim 1; It is characterized in that: described executive circuit (4) comprises the pull-in winding of resistance R 8 and contactor K; The output of comparison circuit (3) links to each other with an end of resistance R 8, the pull-in winding of contactor K respectively; The other end of resistance R 8 links to each other with the anode of LED, the minus earth of LED.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102387842A CN102761097A (en) | 2012-07-11 | 2012-07-11 | Direct current leakage protective circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102387842A CN102761097A (en) | 2012-07-11 | 2012-07-11 | Direct current leakage protective circuit |
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| CN102761097A true CN102761097A (en) | 2012-10-31 |
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| CN2012102387842A Pending CN102761097A (en) | 2012-07-11 | 2012-07-11 | Direct current leakage protective circuit |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103091544A (en) * | 2013-01-21 | 2013-05-08 | 中国人民解放军63963部队 | Direct current electric leakage detection circuit |
| CN103795029A (en) * | 2013-08-20 | 2014-05-14 | 深圳市金霆科技有限公司 | Leakage current detection protection circuit of direct-current remote supply power system |
| CN105914712A (en) * | 2015-02-20 | 2016-08-31 | 依必安派特穆尔芬根有限两合公司 | Device and method for detecting residual curent |
| CN106160592A (en) * | 2016-07-07 | 2016-11-23 | 西北工业大学 | A kind of miniaturization high-power brushless DC motor controller and layout structure |
| CN106711932A (en) * | 2017-01-04 | 2017-05-24 | 山东中大电源科技有限公司 | DC side ground fault protection device in DC power supply system |
| CN107178737A (en) * | 2017-07-21 | 2017-09-19 | 江苏恒鹏电气集团有限公司 | A kind of permanent illumination street lamp of high efficiency |
| WO2019015141A1 (en) * | 2017-07-21 | 2019-01-24 | 江苏恒鹏电气集团有限公司 | High-efficiency constant-illumination street lamp |
| CN109388075A (en) * | 2018-12-12 | 2019-02-26 | 中国航发南方工业有限公司 | Signal detecting and measuring apparatus |
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| EP0215620A2 (en) * | 1985-09-06 | 1987-03-25 | Southern California Edison Company | DC ground fault detection |
| CN2549477Y (en) * | 2002-05-10 | 2003-05-07 | 甘肃省电力公司 | DC system ground fault tester |
| CN101308185A (en) * | 2008-05-06 | 2008-11-19 | 合肥同智科技发展有限公司 | Direct current supply line electrical leakage detection circuit |
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| CN202678933U (en) * | 2012-07-11 | 2013-01-16 | 合肥华耀电子工业有限公司 | DC earth leakage protection circuit |
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2012
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Patent Citations (5)
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| EP0215620A2 (en) * | 1985-09-06 | 1987-03-25 | Southern California Edison Company | DC ground fault detection |
| CN2549477Y (en) * | 2002-05-10 | 2003-05-07 | 甘肃省电力公司 | DC system ground fault tester |
| CN101308185A (en) * | 2008-05-06 | 2008-11-19 | 合肥同智科技发展有限公司 | Direct current supply line electrical leakage detection circuit |
| CN101964512A (en) * | 2010-11-05 | 2011-02-02 | 江苏省电力公司东台市供电公司 | Electric leakage protector with overvoltage protective device |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103795029A (en) * | 2013-08-20 | 2014-05-14 | 深圳市金霆科技有限公司 | Leakage current detection protection circuit of direct-current remote supply power system |
| CN103795029B (en) * | 2013-08-20 | 2016-09-07 | 深圳市金霆科技有限公司 | The leakage current test protection circuit of direct-current remote feeding power system |
| CN105914712A (en) * | 2015-02-20 | 2016-08-31 | 依必安派特穆尔芬根有限两合公司 | Device and method for detecting residual curent |
| CN106160592A (en) * | 2016-07-07 | 2016-11-23 | 西北工业大学 | A kind of miniaturization high-power brushless DC motor controller and layout structure |
| CN106711932A (en) * | 2017-01-04 | 2017-05-24 | 山东中大电源科技有限公司 | DC side ground fault protection device in DC power supply system |
| CN107178737A (en) * | 2017-07-21 | 2017-09-19 | 江苏恒鹏电气集团有限公司 | A kind of permanent illumination street lamp of high efficiency |
| WO2019015142A1 (en) * | 2017-07-21 | 2019-01-24 | 江苏恒鹏电气集团有限公司 | High-efficiency constant-illumination street lamp |
| WO2019015141A1 (en) * | 2017-07-21 | 2019-01-24 | 江苏恒鹏电气集团有限公司 | High-efficiency constant-illumination street lamp |
| CN109388075A (en) * | 2018-12-12 | 2019-02-26 | 中国航发南方工业有限公司 | Signal detecting and measuring apparatus |
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Application publication date: 20121031 |