CN103384076B - 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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- CN103384076B CN103384076B CN201310301082.9A CN201310301082A CN103384076B CN 103384076 B CN103384076 B CN 103384076B CN 201310301082 A CN201310301082 A CN 201310301082A CN 103384076 B CN103384076 B CN 103384076B
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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 for li-ion cell protection and method of work thereof; in particular to when being in complete emptying state (voltage is almost zero volt) at electric quantity of lithium battery; also need the protective circuit to lithium cell charging, belong to 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 mutually is carried out in its inside.Under certain conditions, as inside battery generation chemical side reactions will be caused to over-charge of lithium battery electricity, overdischarge and overcurrent, after this side reaction aggravation, performance and the useful life of battery can be had a strong impact on, and a large amount of gas may be produced, make cell internal pressure increase after-explosion rapidly and cause safety problem.Therefore all lithium ion batteries all need a protective circuit, for effectively monitoring the charge and discharge state of battery, and turn off charge and discharge loop under certain conditions to prevent from damaging battery.
At present, the lithium battery protection circuit of the overwhelming majority is power taking from self lithium battery, and when the whole emptying of the electricity of self lithium battery, control chip is electric owing to obtaining, thus the switching device of uncontrollable outside.When being particularly in adopt P channel mosfet to do circuit that positive pole cuts off, there will be the extreme situation that cannot charge and occur, thus cause product cannot continue to use.
Summary of the invention
Technical problem to be solved by this invention is: for the defect of prior art; a kind of zero volt charging circuit for li-ion cell protection and method of work thereof are provided; this circuit solves the problem that existing lithium battery protection circuit cannot charge normal when battery is zero volt, achieves zero volt charge function.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
For a zero volt charging circuit for li-ion cell protection, comprise discharge and recharge 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 7th resistance;
Wherein, first control end is connected with one end of the 4th resistance, 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 second triode is connected with the emitter of the first triode, the collector electrode of the first triode is connected with one end of the 3rd resistance, one end of the other end respectively with the second resistance of the 3rd resistance, the grid of charging control 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 control effect transistor, the positive pole of discharge and recharge interface is connected,
Second control end is connected with one end of the 7th resistance, the other end of the 7th resistance is connected with the base stage of the 3rd triode, the grounded emitter of the 3rd triode, the collector electrode of the 3rd triode is connected with one end of the 5th resistance, 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, the drain electrode of control of discharge effect transistor is connected with the drain electrode of charging control 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 of discharge and recharge 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 is 0V, the first control end is in non-high level state, the second triode cut-off, the charging of now discharge and recharge interface access charger, and the emitter forward collector electrode reverse bias simultaneously of the first triode, reaches turn-on condition conducting; The grid of charging control effect transistor is pulled low to 0V by the first triode, now the source electrode of charging control effect transistor is charging voltage, the cut-in voltage of charging control effect transistor meets turn-on condition conducting, major loop forms closed conducting loop by the control effect transistor that charges, control of discharge effect transistor, battery interface and discharge and recharge interface, completes the zero volt charging work of lithium battery.
The present invention adopts above technical scheme compared with prior art; there is following technique effect: during the complete emptying of electricity (open circuit voltage is almost zero volt) of lithium battery; baffle from power taking battery, cannot cause the switching tube break-make of uncontrollable outside, thus cannot charge for battery.After adding protective circuit of the present invention, even if when lithium battery open circuit voltage is zero volt, the charger still by outside is lithium cell charging.Simplicity of design of the present invention, is convenient in product design practical; Improve the performance of protection system; Do not increase assembling parts, convenient production; Adopt device to be switching controls device, without high pressure, the particular/special requirement such as high-power, cost is low.
Accompanying drawing explanation
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 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 discharge and recharge interface P2, battery interface P1, is positioned over a pair P channel mosfet of anode: charging control MOSFET Q1 and control of discharge MOSFET Q4; also comprise triode Q2, the triode Q3 of control charging MOSFET Q1 switch, the first control end 1; the triode Q5 of controlled discharge MOSFET Q4 switch, the second control end 2, resistance R1 to R7.Wherein charge the source electrode of control MOSFET Q1 respectively with the positive pole of charge port P2 and be connected with the collector electrode of triode Q3 by resistance R1; The grid of charging control MOSFET Q1 and source electrode are connected to the two ends of resistance R2; The drain electrode of charging control MOSFET Q1 is connected with the drain electrode of control of discharge MOSFET Q4, and the grid of charging control MOSFET Q1 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 is connected to the ground jointly; Triode Q3 is connected with the first control end 1 by resistance R4; The resistance R5 that passes 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 R6 with drain electrode; The base stage of triode Q5 is connected with the second control end 2 by resistance R7; 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 of discharge and recharge interface P2.
A kind of zero volt charging circuit for li-ion cell protection disclosed in the present embodiment is actually on the basis of conventional protective circuit; add switch triode and current limliting, divider resistance; make when lithium battery is zero volts, charger still can be opened metal-oxide-semiconductor by triode combinational circuit and charge the battery.
Specific works principle is as follows: when the complete emptying of electric quantity of lithium battery and voltage are 0V, originally cannot work from the control chip of power taking lithium battery, the first control end (1) then exported by chip is in non-high level state, triode Q3 ends, now charge port P2 accesses charger charging, the emitter junction forward bias of triode Q2 and collector junction reverse bias, reach turn-on condition conducting, thus triode Q2 is pulled down to 0V the grid of metal-oxide-semiconductor Q1, now the source electrode of Q1 is charging voltage, the Vgs of Q1 meets turn-on condition conducting, now major loop is by metal-oxide-semiconductor Q1, the body diode of metal-oxide-semiconductor Q4, battery and charger form closed conducting loop, thus complete charging work.
What finally illustrate is, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, other amendments that those of ordinary skill in the art make technical scheme of the present invention or with replacing, only otherwise depart from the spirit and scope of technical solution of the present invention, all should be encompassed in the middle of right of the present invention.
Claims (2)
1. for a zero volt charging circuit for li-ion cell protection, it is characterized in that: comprise discharge and recharge 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, first control end is connected with one end of the 4th resistance, 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 second triode is connected with the emitter of the first triode, the collector electrode of the first triode is connected with one end of the 3rd resistance, 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 of discharge and recharge interface is connected,
Second control end is connected with one end of the 7th resistance, the other end of the 7th resistance is connected with the base stage of the 3rd triode, the grounded emitter of the 3rd triode, the collector electrode of the 3rd triode is connected with one end of the 5th resistance, 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 of discharge and recharge 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, specific as follows:
When the voltage of battery interface is 0V, the first control end is in non-high level state, the second triode cut-off, the charging of now discharge and recharge interface access charger, and the emitter forward collector electrode reverse bias simultaneously of the first triode, reaches turn-on condition conducting; The grid of charging controlling filed effect transistor is pulled low to 0V by the first triode, now the source electrode of charging controlling filed effect transistor is charging voltage, the conducting when cut-in voltage of charging controlling filed effect transistor meets turn-on condition, major loop forms closed conducting loop by the controlling filed effect transistor that charges, control of discharge field-effect transistor, battery interface and discharge and recharge interface, completes the zero volt charging work of lithium battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| 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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| CN103384076A CN103384076A (en) | 2013-11-06 |
| CN103384076B true CN103384076B (en) | 2015-04-08 |
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Families Citing this family (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 |
| CN106130100A (en) * | 2016-07-01 | 2016-11-16 | 北京云迹科技有限公司 | Controlled battery charger and charger |
| CN106026277A (en) * | 2016-07-01 | 2016-10-12 | 北京云迹科技有限公司 | Controllable battery charging circuit and charger |
| CN107017701B (en) * | 2017-06-12 | 2024-06-21 | 中山市中泰能科技有限公司 | Solar uninterrupted power supply management system |
| 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 |
| 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 |
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 |
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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 |
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Granted publication date: 20150408 Termination date: 20190718 |