CN103384076A - Zero-v charging circuit for lithium battery protection and working method thereof - Google Patents
Zero-v charging circuit for lithium battery protection and working method thereof Download PDFInfo
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- CN103384076A CN103384076A CN2013103010829A CN201310301082A CN103384076A CN 103384076 A CN103384076 A CN 103384076A CN 2013103010829 A CN2013103010829 A CN 2013103010829A CN 201310301082 A CN201310301082 A CN 201310301082A CN 103384076 A CN103384076 A CN 103384076A
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Abstract
The invention discloses a zero-v charging circuit for lithium battery protection and a working method thereof. The zero-v charging circuit for lithium battery protection comprises a charging and discharging interface (P2), a battery interface (P1), a charging control metal-oxide-semiconductor field effect transistor (MOSFET) (Q1), a discharging control MOSFET (Q4), a first triode (Q2), a second triode (Q3), a third triode (Q5), a first control end (1), a second control end (2), a first resistor (R1), a second resistor (R2), a third resistor (R3), a fourth resistor (R4), a fifth resistor (R5), a sixth resistor (R6) and a seventh resistor (R7). By means of the zero-v charging circuit for lithium battery protection, lithium batteries can be charged through an outside charger even though the voltage of an open circuit of the lithium batteries is zero. The zero-v charging circuit for lithium battery protection is simple in design, facilitates practicality in product design, improves performance of a protection system, is convenient to produce without increasing assembly parts, adopts devices which are all switching control devices, is free of special requirements for high voltage, large power and the like, and is low in cost.
Description
Technical field
The invention discloses a kind of zero volt charging circuit and method of work thereof for li-ion cell protection; be particularly related to when electric quantity of lithium battery is in complete emptying state (voltage is almost zero volt); also need the protective circuit to lithium cell charging, belong to the battery charging and discharging technical field.
Background technology
Due to the chemical characteristic of lithium ion battery, in normal use procedure, the chemical positive reaction that electric energy and chemical energy transform is mutually carried out in its inside.Under certain conditions, as causing inside battery generation chemical side reactions to over-charge of lithium battery electricity, overdischarge and overcurrent, after this side reaction aggravation, can have a strong impact on performance and the useful life of battery, and may produce a large amount of gases, make cell internal pressure increase after-explosion rapidly and cause safety problem.Therefore all lithium ion batteries all need a protective circuit, are used for the charge and discharge state of battery is effectively monitored, and turn-off under certain conditions the charge and discharge loops and battery is damaged preventing.
At present, the lithium battery protection circuit of the overwhelming majority is power taking from self lithium battery, and when the whole emptying of electric weight of self lithium battery, control chip is electric owing to getting, thus the switching device of uncontrollable outside.Particularly be in when adopting the P channel mosfet to do the anodal circuit that cuts off, the extreme situation that can occur charging occurs, thereby causes product can't continue to use.
Summary of the invention
Technical problem to be solved by this invention is: for the defective of prior art; a kind of zero volt charging circuit and method of work thereof for li-ion cell protection is provided; this circuit has solved the problem that existing lithium battery protection circuit can't charge normal when battery is zero volt, realized the zero volt charge function.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
A kind of zero volt charging circuit for li-ion cell protection comprises discharging and recharging interface, battery interface, charging control effect transistor, control of discharge effect transistor, the first triode, the second triode, the 3rd triode, the first control end, the second control end and the first resistance to the seven resistance;
wherein, one end of the first control end and the 4th resistance is connected, the other end of the 4th resistance is connected with the base stage of the second triode, one end of collector electrode respectively with the first resistance of the second triode, the base stage of the first triode is connected, ground connection after the emitter of the emitter of the second triode and the first triode is connected, one end of the collector electrode of the first triode and the 3rd resistance is connected, one end of the other end respectively with the second resistance of the 3rd resistance, the transistorized grid of charging control effect is connected, the other end of the other end respectively with the second resistance of the first resistance, the transistorized source electrode of charging control effect, the positive pole that discharges and recharges interface is connected,
one end of the second control end and the 7th resistance is connected, the other end of the 7th resistance is connected with the base stage of the 3rd triode, the grounded emitter of the 3rd triode, one end of the collector electrode of the 3rd triode and the 5th resistance is connected, one end of the other end the respectively with six resistance of the 5th resistance, the grid of control of discharge effect transistor is connected, transistorized drain electrode is connected with the charging control effect in the drain electrode of control of discharge effect transistor, the other end of source electrode the respectively with six resistance of control of discharge effect transistor, the positive pole of battery interface is connected, the negative pole of battery interface is connected with the negative pole that discharges and recharges interface,
The invention also discloses the method for work of described a kind of zero volt charging circuit for li-ion cell protection, specific as follows:
When the voltage of battery interface was 0V, the first control end was in non-high level state, and the second triode cut-off discharges and recharges the charging of interface access charger this moment, and the emitter forward of the first triode is the collector electrode reverse bias simultaneously, reaches the turn-on condition conducting; The first triode transistorized grid of control effect that will charge is pulled low to 0V, the transistorized source electrode of control effect that charges this moment is charging voltage, the transistorized cut-in voltage of charging control effect satisfies the turn-on condition conducting, major loop is by charging control effect transistor, control of discharge effect transistor, battery interface and discharge and recharge interface and form closed conducting loop, completes the zero volt charging work of lithium battery.
The present invention adopts above technical scheme compared with prior art; has following technique effect: during the complete emptying of the electric weight of lithium battery (open circuit voltage is almost zero volt); baffle can't from power taking on battery, cause the switching tube break-make of uncontrollable outside, thereby can't charge for battery.After adding protective circuit of the present invention, even when the lithium battery open circuit voltage is zero volt, can be still lithium cell charging by the charger of outside.Simplicity of design of the present invention is convenient in product design practical; Improved the performance of protection system; Do not increase assembling parts, convenient production; Adopt device to be the switching controls device, without high pressure, specific (special) requirements such as high-power grade, cost is low.
Description of drawings
Fig. 1 is circuit diagram of the present invention,
Wherein: R1 to R7 is followed successively by the first to the 7th resistance; Q1 is charging control effect transistor (MOSFET), and Q4 is control of discharge effect transistor (MOSFET), and Q2, Q3, Q5 are followed successively by first, second, third triode; P1 is battery interface, and P2 is the charge and discharge interface; 1 is the first control end, and 2 is the second control end.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:
As shown in Figure 1; a kind of zero volt charging circuit for li-ion cell protection disclosed in this invention comprises a pair of P channel mosfet that discharges and recharges interface P2, battery interface P1, is positioned over anode: MOSFET Q1 and control of discharge MOSFET Q4 are controlled in charging; also comprise triode Q2, triode Q3, the first control end 1 of controlling charging MOSFET Q1 switch; the triode Q5 of controlled discharge MOSFET Q4 switch, the second control end 2, resistance R 1 is to R7.Wherein charging control MOSFET Q1 source electrode respectively with the anodal of charge port P2 and be connected by the collector electrode of resistance R 1 with triode Q3; The grid of MOSFET Q1 and the two ends that source electrode is connected in resistance R 2 are controlled in charging; The drain electrode that MOSFET Q1 is controlled in charging is connected with the drain electrode of control of discharge MOSFET Q4, and the grid that MOSFET Q1 is controlled in charging is connected with the collector electrode of triode Q2 by R3; The base stage of triode Q2 is connected with the collector electrode of triode Q3; Triode Q2 and triode Q3 are connected to the ground jointly; Triode Q3 is connected with the first control end 1 by resistance R 4; The resistance R 5 of passing through of the grid of control of discharge MOSFET Q4 is connected with the collector electrode of triode Q5; The grid of control of discharge MOSFET Q4 is connected by resistance R 6 with drain electrode; The base stage of triode Q5 is connected with the second control end 2 by resistance R 7; The transmitter of triode Q5 is connected to the ground; The drain electrode of control of discharge MOSFET Q4 is connected with the positive pole of battery interface P1; The negative pole of battery interface P1 is connected with the negative pole that discharges and recharges interface P2.
The disclosed a kind of zero volt charging circuit for li-ion cell protection of the present embodiment is actually the basis in protective circuit commonly used; switch triode and current limliting, divider resistance have been increased; make when lithium battery is zero volt voltage, charger still can be opened metal-oxide-semiconductor by the triode combinational circuit and charge the battery.
the specific works principle is as follows: when the complete emptying of electric quantity of lithium battery is that voltage is when being 0V, originally the control chip of power taking can't be worked from the lithium battery, the first control end (1) by chip output is in non-high level state, triode Q3 cut-off, the charging of charge port P2 access this moment charger, the emitter junction forward bias of triode Q2 and collector junction reverse bias, reach the turn-on condition conducting, thereby triode Q2 is pulled down to 0V to the grid of metal-oxide-semiconductor Q1, this moment, the source electrode of Q1 was charging voltage, the Vgs of Q1 satisfies the turn-on condition conducting, this moment, major loop was by metal-oxide-semiconductor Q1, the body diode of metal-oxide-semiconductor Q4, battery and charger form closed conducting loop, thereby complete charging work.
Explanation is at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, other modifications or same can the replacement that those of ordinary skills make technical scheme of the present invention, only otherwise break away from the spirit and scope of technical solution of the present invention, all should be encompassed in the middle of claim scope of the present invention.
Claims (2)
1. a zero volt charging circuit that is used for li-ion cell protection, is characterized in that: comprise discharging and recharging interface, battery interface, charging controlling filed effect transistor, control of discharge field-effect transistor, the first triode, the second triode, the 3rd triode, the first control end, the second control end and the first to the 7th resistance;
wherein, one end of the first control end and the 4th resistance is connected, the other end of the 4th resistance is connected with the base stage of the second triode, one end of collector electrode respectively with the first resistance of the second triode, the base stage of the first triode is connected, ground connection after the emitter of the emitter of the second triode and the first triode is connected, one end of the collector electrode of the first triode and the 3rd resistance is connected, one end of the other end respectively with the second resistance of the 3rd resistance, the grid of charging controlling filed effect transistor is connected, the other end of the other end respectively with the second resistance of the first resistance, the source electrode of charging controlling filed effect transistor, the positive pole that discharges and recharges interface is connected,
one end of the second control end and the 7th resistance is connected, the other end of the 7th resistance is connected with the base stage of the 3rd triode, the grounded emitter of the 3rd triode, one end of the collector electrode of the 3rd triode and the 5th resistance is connected, one end of the other end the respectively with six resistance of the 5th resistance, the grid of control of discharge field-effect transistor is connected, the drain electrode of control of discharge field-effect transistor is connected with the drain electrode of charging controlling filed effect transistor, the other end of source electrode the respectively with six resistance of control of discharge field-effect transistor, the positive pole of battery interface is connected, the negative pole of battery interface is connected with the negative pole that discharges and recharges interface.
2. the method for work of a kind of zero volt charging circuit for li-ion cell protection as claimed in claim 1, is characterized in that, and is specific as follows:
When the voltage of battery interface was 0V, the first control end was in non-high level state, and the second triode cut-off discharges and recharges the charging of interface access charger this moment, and the emitter forward of the first triode is the collector electrode reverse bias simultaneously, reaches the turn-on condition conducting; To the charge grid of controlling filed effect transistor of the first triode is pulled low to 0V, the source electrode of controlling filed effect transistor of charging this moment is charging voltage, the cut-in voltage of charging controlling filed effect transistor satisfies the turn-on condition conducting, major loop is by charging controlling filed effect transistor, control of discharge field-effect transistor, battery interface and discharge and recharge interface and form closed conducting loop, completes the zero volt charging work of lithium battery.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310301082.9A CN103384076B (en) | 2013-07-18 | 2013-07-18 | Zero-v charging circuit for lithium battery protection and working method thereof |
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| CN201310301082.9A CN103384076B (en) | 2013-07-18 | 2013-07-18 | Zero-v charging circuit for lithium battery protection and working method thereof |
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| CN103384076B CN103384076B (en) | 2015-04-08 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105576759A (en) * | 2016-01-21 | 2016-05-11 | 苏州经贸职业技术学院 | Lithium battery charging circuit |
| CN106026277A (en) * | 2016-07-01 | 2016-10-12 | 北京云迹科技有限公司 | Controllable battery charging circuit and charger |
| CN106130100A (en) * | 2016-07-01 | 2016-11-16 | 北京云迹科技有限公司 | Controlled battery charger and charger |
| CN107017701A (en) * | 2017-06-12 | 2017-08-04 | 中山市中泰能科技有限公司 | A kind of solar energy uninterrupted power source management system |
| CN107831389A (en) * | 2017-11-03 | 2018-03-23 | 欣旺达电子股份有限公司 | 0V charge functions method of testing and circuit |
| CN108808784A (en) * | 2018-06-26 | 2018-11-13 | 南京微盟电子有限公司 | A kind of zero volt battery charger of protection chip for the charging of binodal lithium battery |
| CN109049020A (en) * | 2018-10-22 | 2018-12-21 | 浙江亚尚智能科技有限公司 | The control circuit of electric shaver |
| CN109672249A (en) * | 2019-01-22 | 2019-04-23 | 深圳流量链科技有限公司 | A kind of battery management protective device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1909325A (en) * | 2005-08-01 | 2007-02-07 | 三洋电机株式会社 | Battery pack with circuit protection function |
-
2013
- 2013-07-18 CN CN201310301082.9A patent/CN103384076B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1909325A (en) * | 2005-08-01 | 2007-02-07 | 三洋电机株式会社 | Battery pack with circuit protection function |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105576759A (en) * | 2016-01-21 | 2016-05-11 | 苏州经贸职业技术学院 | Lithium battery charging circuit |
| CN106026277A (en) * | 2016-07-01 | 2016-10-12 | 北京云迹科技有限公司 | Controllable battery charging circuit and charger |
| CN106130100A (en) * | 2016-07-01 | 2016-11-16 | 北京云迹科技有限公司 | Controlled battery charger and charger |
| CN107017701A (en) * | 2017-06-12 | 2017-08-04 | 中山市中泰能科技有限公司 | A kind of solar energy uninterrupted power source management system |
| CN107831389A (en) * | 2017-11-03 | 2018-03-23 | 欣旺达电子股份有限公司 | 0V charge functions method of testing and circuit |
| CN107831389B (en) * | 2017-11-03 | 2020-01-14 | 欣旺达电子股份有限公司 | 0V charging function test method and circuit |
| CN108808784A (en) * | 2018-06-26 | 2018-11-13 | 南京微盟电子有限公司 | A kind of zero volt battery charger of protection chip for the charging of binodal lithium battery |
| CN109049020A (en) * | 2018-10-22 | 2018-12-21 | 浙江亚尚智能科技有限公司 | The control circuit of electric shaver |
| CN109049020B (en) * | 2018-10-22 | 2023-09-05 | 浙江亚尚智能科技有限公司 | Control circuit of electric shaver |
| CN109672249A (en) * | 2019-01-22 | 2019-04-23 | 深圳流量链科技有限公司 | A kind of battery management protective device |
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| CN103384076B (en) | 2015-04-08 |
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