CN103855688B - The leakage current protection circuit of battery - Google Patents
The leakage current protection circuit of battery Download PDFInfo
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- CN103855688B CN103855688B CN201210496707.7A CN201210496707A CN103855688B CN 103855688 B CN103855688 B CN 103855688B CN 201210496707 A CN201210496707 A CN 201210496707A CN 103855688 B CN103855688 B CN 103855688B
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Abstract
A kind of leakage current protection circuit of battery; in order to prevent battery from when electric discharge, charging circuit being discharged; described leakage current protection circuit includes a comparison circuit and an on-off circuit; described comparison circuit receives the first control signal coming from battery, and exports one second control signal according to the first control signal；Described on-off circuit receives described second control signal and comes from the 3rd control signal of a charger, and is opened or closed the electric connection of described battery and described charging circuit according to described second control signal and described 3rd control signal.The leakage current protection circuit of this battery can prevent battery from discharging in a non-operative state, to reduce leakage current, improves the endurance of battery.
Description
Technical field
The present invention relates to a kind of circuit structure, particularly relate to the leakage current protection circuit of a kind of battery.
Background technology
For some light fixture, its discharge circuit is electrically being connected together with charging circuit.So, even if light fixture does not works, battery is also being discharged to charging circuit by discharge circuit.This is formed for leakage current, if leakage current is excessive, the endurance of battery is the shortest.Especially at outdoor electronic equipment, such as mobile phone, the mine lamp etc. of the field work of lithium battery power supply, the short electronic equipment that will have a strong impact on of flying power uses.
Summary of the invention
The technical problem to be solved in the present invention is the deficiency overcoming above-mentioned prior art to exist, and proposes the leakage current protection circuit of a kind of battery, and it can prevent battery from discharging in a non-operative state, to reduce leakage current, improves the endurance of battery.
For solving above-mentioned technical problem; the present invention proposes the leakage current protection circuit of a kind of battery; in order to prevent battery from when electric discharge, charging circuit being discharged; described leakage current protection circuit includes a comparison circuit and an on-off circuit; described comparison circuit receives the first control signal coming from battery, and exports one second control signal according to the first control signal；Described on-off circuit receives described second control signal and comes from the 3rd control signal of a charger, and is opened or closed the electric connection of described battery and described charging circuit according to described second control signal and described 3rd control signal.
Preferably, described comparison circuit includes a comparator, and the positive input terminal of described comparator receives described first control signal, and the negative input end of described comparator receives a reference voltage, and the outfan of described comparator exports described second control signal.
Preferably, described comparison circuit also includes a resistance and a commutation diode, the positive input terminal of described comparator is connected with one end of described resistance, and the other end of described resistance connects the negative electrode of described commutation diode, and the anode of described commutation diode receives described first control signal.
Preferably, described comparison circuit also includes two resistance, and one end of one of them resistance connects the positive input terminal of described comparator, other end ground connection；One end of another resistance connects the outfan of described comparator, and the other end exports described second control signal.
Preferably, described on-off circuit includes: one first switch, a second switch, three resistance and an electric capacity, and each switch all includes that one controls end, an input and an outfan, and three resistance are respectively the first resistance, the second resistance and the 3rd resistance；The input of the first switch receives described 3rd control signal, and the first outfan switched connects charging circuit, and the end that controls of the first switch connects the outfan of second switch, and the two ends of the first resistance connect control end and the input of the first switch of the first switch respectively；The input end grounding of second switch, the end that controls of second switch connects one end of the second resistance, the other end of the second resistance is connected with one end of one end of the 3rd resistance and electric capacity respectively and receives described second control signal, the other end ground connection of the 3rd resistance, the other end of electric capacity receives described 3rd control signal.
Preferably, described first switch is P-channel field-effect transistor (PEFT) transistor, and control end, input and the outfan of described first switch are respectively control pole, source electrode and the drain electrode of P-channel field-effect transistor (PEFT) transistor.
Preferably, described second switch is audion, and control end, input and the outfan of described second switch are respectively the base stage of audion, emitter and collector.
Preferably, when battery discharge and charger power-off, first control signal of battery output electronegative potential, first control signal of this electronegative potential controls the second control signal of comparison circuit output electronegative potential, and described on-off circuit receives described second control signal of electronegative potential and disconnects the electric connection of described battery and described charging circuit.
Preferably, when charger is energized, powered on moment, 3rd control signal of its output high potential, on-off circuit receives the 3rd control signal of high potential and closes the electric connection of described battery and described charging circuit, battery is made to charge, after powered on moment, battery exports the first control signal of a high potential, first control signal of this high potential controls comparison circuit and exports the second control signal of a high potential, second control signal of this high potential controls the electric connection of described on-off circuit Guan Bi battery and charging circuit, and then maintains battery charging.
Compared with prior art; there is advantages that the leakage current protection circuit of the present invention is being applied in the charging and discharging circuit of battery; battery is made to charge normal; and make battery when electric discharge; disconnect the electric connection with charging circuit, and then reduce leakage current, extend the flying power of battery; reduce the charging times of battery, increase the service life of battery.
Accompanying drawing explanation
Fig. 1 is the frame structure schematic diagram of the leakage current protection circuit of battery of the present invention.
Fig. 2 is that the leakage current protection circuit of battery of the present invention applies the circuit diagram in battery charging and discharging loop.
Detailed description of the invention
Refering to Fig. 1, the leakage current protection circuit of the present invention includes: comparison circuit 1 and an on-off circuit 2.This leakage current protection circuit is applied in the charging and discharging circuit of battery, in order to prevent battery from discharging charging circuit when electric discharge, and then reduces leakage current, improves the endurance of battery.
Charger 3 is connected on external power supply, and charged circuit 4 charges for battery 6；Discharge circuit 6 is the operating circuit of the lamp light source of light fixture, and it is connected with battery 5, battery 5 power for it.Battery 6 can send the first control signal when charging, comparison circuit 2 receives this first control signal, and export one second control signal according to the first control signal, on-off circuit 1 receives this second control signal and comes from the 3rd control signal of charger 3, and is opened or closed the electric connection of battery and charging circuit 4 according to the second control signal and the 3rd control signal.
Refering to Fig. 2, comparison circuit 2 includes: comparator U1B and a peripheral circuit thereof, and the positive input terminal of comparator U1B receives the first control signal exported by battery 5 by an a resistance R8 and commutation diode D1.The positive input terminal of comparator U1B is connected with one end of resistance R8, and the other end of resistance R8 connects the negative electrode of commutation diode D1, and the anode of commutation diode D1 receives the first control signal；The negative input end of comparator U1B receives reference voltage V REF by a resistance R6, and one end of resistance R6 connects the negative input end of comparator U1B, and the other end connects reference voltage VREF；The outfan of comparator U1B exports the second control signal.
For making comparator U1B obtain preferable gain, also can be at the connection one resistance R5 of comparator U1B positive input terminal, also a resistance R4 is connected at comparator U1B outfan, one end of resistance R5 connects the positive input terminal of comparator U1B, the other end ground connection of resistance R5, one end of resistance R4 connects the outfan of comparator U1B, and the other end of resistance R4 exports the second control signal.
On-off circuit 1 includes: one first switch Q1, a second switch Q2, three resistance and an electric capacity C1.Each switch all includes that one controls end, an input and an outfan, and three resistance are respectively the first resistance R1, the second resistance R2 and the 3rd resistance R3.The input of the first switch Q1 receives the 3rd control signal, the outfan of the first switch Q1 connects the input of charging circuit 4, first switch Q1 controls the outfan that end connects second switch Q2, and the two ends of the first resistance R1 connect the end and first that controls of the first switch Q1 respectively and switch the input of Q1；The input end grounding of second switch Q2, second switch Q2 controls one end that end connects the second resistance R2, the other end of the second resistance R2 is connected with one end of the 3rd resistance R3 and one end of electric capacity C1 respectively and receives the second control signal of comparison circuit 2 output, the other end ground connection of the 3rd resistance R3, the other end of electric capacity C1 receives the 3rd control signal of charger 3 output.
Wherein, the first switch Q1 can be P-channel field-effect transistor (PEFT) transistor, and control end, input and the outfan of the first switch Q1 are respectively control pole, source electrode and the drain electrode of P-channel field-effect transistor (PEFT) transistor；Second switch Q2 can be audion, and control end, input and the outfan of second switch Q2 are respectively the base stage of audion, emitter and collector.
The operation principle of this leakage current protection circuit is as follows.
When charger 3 is energized, the charging voltage of its output 4-10V, i.e. the 3rd control signal, first this voltage be carried on the electric capacity C1 of on-off circuit 1, at powered on moment, crest voltage can allow the cathode voltage of this electric capacity moment above Ground, and the voltage that this moment is above Ground can allow second switch Q2 turn at the moment, then the voltage controlling end of the first switch Q1 can be dragged down, the first switch Q1 is made to be also switched on, thus the voltage of 4-10V is imported to charging circuit, make charging circuit 4 be electrically connected with battery 5, charge to battery 5.And after powered on moment peak voltage, battery 5 exports the first control signal of high potential, first control signal of this high potential is transfused to the positive input terminal of comparator U1B, this first control signal is compared by comparator U1B with reference voltage V REF, exporting the second control signal of a high potential, the second control signal of this high potential is transfused to the control end of second switch Q2, makes second switch Q2 turn on, and then make the first switch Q1 conducting, to maintain the electric connection of Guan Bi charging circuit 4 and battery 5.And when charging, 4-10V voltage is higher than battery 5 voltage, so, battery 5 will not discharge.
nullWhen charger 3 power-off，And the switch 61 of discharge circuit 6 is when closing，Discharge circuit 6 is discharged by battery 5 rectified diode D1，Now，Battery 5 exports the first control signal of an electronegative potential，The positive input terminal of the comparator U1B of the first control signal input comparison circuit 2 of this electronegative potential，This first control signal is compared by comparator U1B with reference voltage V REF，Export the second control signal of an electronegative potential，Second control signal of this electronegative potential is transfused to the second switch Q2 of on-off circuit 1，Second switch Q2 is made to turn off，And the control terminal voltage of the first switch Q1 increases，First switch Q1 turns off，Thus disconnect the electric connection of charging circuit 4 and battery 5，Make battery 5 will not discharge to charging circuit 4，The most do not have leakage current，So，Battery can be carried out good residual current protection.
It should be noted that these are only the preferable possible embodiments of the present invention, not limit the scope of the invention, the equivalent structure change done by all utilization description of the invention and accompanying drawing content, be all contained in protection scope of the present invention.
Claims (9)
1. the leakage current protection circuit of a battery; in order to prevent battery from when electric discharge, charging circuit being discharged; it is characterized in that; described leakage current protection circuit includes a comparison circuit and an on-off circuit; described comparison circuit receives the first control signal coming from battery, and exports one second control signal according to the first control signal；Described on-off circuit receives described second control signal and comes from the 3rd control signal of a charger, and is opened or closed the electric connection of described battery and described charging circuit according to described second control signal and described 3rd control signal.
2. the leakage current protection circuit of battery as claimed in claim 1; it is characterized in that; described comparison circuit includes a comparator; the positive input terminal of described comparator receives described first control signal; the negative input end of described comparator receives a reference voltage, and the outfan of described comparator exports described second control signal.
3. the leakage current protection circuit of battery as claimed in claim 2; it is characterized in that; described comparison circuit also includes a resistance and a commutation diode; the positive input terminal of described comparator is connected with one end of described resistance; the other end of described resistance connects the negative electrode of described commutation diode, and the anode of described commutation diode receives described first control signal.
4. the leakage current protection circuit of battery as claimed in claim 3, it is characterised in that described comparison circuit also includes two resistance, and one end of one of them resistance connects the positive input terminal of described comparator, other end ground connection；One end of another resistance connects the outfan of described comparator, and the other end exports described second control signal.
5. the leakage current protection circuit of battery as claimed in claim 1; it is characterized in that; described on-off circuit includes: one first switch, a second switch, three resistance and an electric capacity; each switch all includes that one controls end, an input and an outfan, and three resistance are respectively the first resistance, the second resistance and the 3rd resistance；The input of the first switch receives described 3rd control signal, and the first outfan switched connects charging circuit, and the end that controls of the first switch connects the outfan of second switch, and the two ends of the first resistance connect control end and the input of the first switch of the first switch respectively；The input end grounding of second switch, the end that controls of second switch connects one end of the second resistance, the other end of the second resistance is connected with one end of one end of the 3rd resistance and electric capacity respectively and receives described second control signal, the other end ground connection of the 3rd resistance, the other end of electric capacity receives described 3rd control signal.
6. the leakage current protection circuit of battery as claimed in claim 5; it is characterized in that; described first switch is P-channel field-effect transistor (PEFT) transistor, and control end, input and the outfan of described first switch are respectively control pole, source electrode and the drain electrode of P-channel field-effect transistor (PEFT) transistor.
7. the leakage current protection circuit of battery as claimed in claim 5, it is characterised in that described second switch is audion, control end, input and the outfan of described second switch are respectively the base stage of audion, emitter and collector.
8. the leakage current protection circuit of battery as claimed in claim 1; it is characterized in that; when battery discharge and charger power-off; first control signal of battery output electronegative potential; first control signal of this electronegative potential controls the second control signal of comparison circuit output electronegative potential, and described on-off circuit receives described second control signal of electronegative potential and disconnects the electric connection of described battery and described charging circuit.
9. the leakage current protection circuit of battery as claimed in claim 1, it is characterized in that, when charger is energized, powered on moment, 3rd control signal of its output high potential, on-off circuit receives the 3rd control signal of high potential and closes the electric connection of described battery and described charging circuit, battery is made to charge, after powered on moment, battery exports the first control signal of a high potential, first control signal of this high potential controls comparison circuit and exports the second control signal of a high potential, second control signal of this high potential controls the electric connection of described on-off circuit Guan Bi battery and charging circuit, and then maintain battery charging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210496707.7A CN103855688B (en) | 2012-11-29 | 2012-11-29 | The leakage current protection circuit of battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210496707.7A CN103855688B (en) | 2012-11-29 | 2012-11-29 | The leakage current protection circuit of battery |
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| CN103855688A CN103855688A (en) | 2014-06-11 |
| CN103855688B true CN103855688B (en) | 2016-12-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210496707.7A Active CN103855688B (en) | 2012-11-29 | 2012-11-29 | The leakage current protection circuit of battery |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI620391B (en) * | 2016-12-23 | 2018-04-01 | 茂達電子股份有限公司 | Switching charging circuit |
| CN106851952B (en) * | 2017-01-04 | 2018-09-25 | 上海奕瑞光电子科技股份有限公司 | A kind of flat panel detector circuit implementing method reducing patient leakage current |
| CN111650530B (en) * | 2020-06-30 | 2022-06-21 | 上海南麟电子股份有限公司 | Power switch state detection circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101286644A (en) * | 2007-04-13 | 2008-10-15 | 富港电子（东莞）有限公司 | Charging and discharging system |
| CN201937301U (en) * | 2011-01-06 | 2011-08-17 | 田剑彪 | Integrated circuit for charging and discharging management on battery pack serially connected by multiple lithium batteries |
| CN202488159U (en) * | 2011-12-23 | 2012-10-10 | 北京世纪东方国铁科技股份有限公司 | Train tail host cell charger |
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2012
- 2012-11-29 CN CN201210496707.7A patent/CN103855688B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101286644A (en) * | 2007-04-13 | 2008-10-15 | 富港电子（东莞）有限公司 | Charging and discharging system |
| CN201937301U (en) * | 2011-01-06 | 2011-08-17 | 田剑彪 | Integrated circuit for charging and discharging management on battery pack serially connected by multiple lithium batteries |
| CN202488159U (en) * | 2011-12-23 | 2012-10-10 | 北京世纪东方国铁科技股份有限公司 | Train tail host cell charger |
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