CN102983557A - Battery protective circuit and charging power switch control signal producing circuit thereof - Google Patents
Battery protective circuit and charging power switch control signal producing circuit thereof Download PDFInfo
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- CN102983557A CN102983557A CN2012104846585A CN201210484658A CN102983557A CN 102983557 A CN102983557 A CN 102983557A CN 2012104846585 A CN2012104846585 A CN 2012104846585A CN 201210484658 A CN201210484658 A CN 201210484658A CN 102983557 A CN102983557 A CN 102983557A
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Abstract
The invention provides a battery protective circuit and a charging power switch control signal producing circuit thereof. The control signal producing circuit comprises a controller for producing control signals, a switch element and a current-limiting resistor, the switch element has three ends, the control end of the switch element is connected with the output end of the controller, one end of the switch element is connected with a high level, the other end of the switch element is connected with one end of the current-limiting resistor, the other end of the current-limiting resistor is connected with a low level, a connection node of the switch element and the current-limiting resistor serves as the output end of a charging power switch control signal in the battery protective circuit, when charging is allowed, the controller outputs the control signal to communicate with the switch element, the output end of the charging power switch control signal in the battery protective circuit outputs the control signal to communicate with a charging power switch, and when the charging is prohibited, the controller outputs the control signal to stop the switch element, and the output end of the charging power switch control signal in the battery protective circuit outputs the control signal to close the charging power switch.
Description
[technical field]
The present invention relates to electronic circuit field, particularly produce improves the circuit about charge power switch controlling signal in a kind of battery protecting circuit.
[background technology]
As shown in Figure 1, existing lithium battery can arrange a charge protection chip usually when charging, is used for when lithium battery being charged according to the charging and discharging state control of battery, when forbids lithium cell charging, to realize the protection to battery.
Fig. 1 shows a kind of structure chart of battery protection system.As shown in Figure 1, described battery protection system comprises battery battery core Bat, resistance R 1, capacitor C 1, battery protecting circuit 110, resistance R 2, charge power switch 130 and discharge power switch 120.Resistance R 1 and capacitor C 1 are series between the anodal B+ and negative pole B-of battery battery core Bat, charge power switch and discharge power switch series are coupled between the negative pole P-of the negative pole B-of battery battery core and battery, and the anodal B+ of battery battery core Bat is directly and between the anodal P+ of battery.
Described discharge power switch comprises NMOS (N-channel Metal Oxide Semiconductor) field effect transistor M N1 and parasitizes the interior diode D1 of its body.Described charge power switch comprises nmos fet MN2 and parasitizes the interior diode D2 of its body.The drain electrode of nmos pass transistor MN1 links to each other with the drain electrode of nmos pass transistor MN2, and the source electrode of nmos pass transistor MN1 links to each other with the negative pole B-of battery battery core, and the source electrode of nmos pass transistor MN2 links to each other with the negative pole P-of battery.
Described battery protecting circuit 110 comprises three links (or being called the test side) and two control ends; three links are respectively the anodal B+ link of battery battery core VDD; battery battery core negative pole B-link VSS and battery cathode P-link VM, two control ends are respectively charging control end COUT and control of discharge end DOUT.Wherein link VDD is connected between resistance R 1 and the capacitor C 1, link VSS links to each other with the negative pole B-of battery battery core, link VM is connected in the negative pole P-of battery by resistance R 2, charging control end COUT links to each other with the control end of charge power switch 130, it is the grid of nmos pass transistor MN2, control of discharge end DOUT links to each other with the control end of discharge power switch 120, i.e. the grid of nmos pass transistor MN1.
Described battery protecting circuit 110 can carry out charge protection and discharge prevention to battery battery core Bat.When charging normal, described battery protecting circuit 110 control nmos pass transistor MN2 conductings, nmos pass transistor MN1 cut-off, charging current flows to nmos pass transistor MN2 from the body diode D1 of nmos pass transistor MN1.When charging abnormal (such as charging overcurrent and charging overvoltage), described battery protecting circuit 110 control nmos pass transistor MN2 cut-offs, thus cut off charging process.When carrying out regular picture, described battery protecting circuit 110 control nmos pass transistor MN2 cut-offs, nmos pass transistor MN1 conducting, discharging current flows to nmos pass transistor MN1 from the body diode D2 of nmos pass transistor MN2.When discharge abnormal (such as discharge overcurrent and discharge overvoltage), described battery protecting circuit 110 control nmos pass transistor MN1 cut-offs, thus cut off discharge process.
Described battery protecting circuit 110 judges whether the overcurrent that discharges by the pressure reduction between link VM and the VSS; if differential pressure surpasses predetermined voltage threshold; think that then discharging current surpasses predetermined current threshold; then start the discharge overcurrent protection function; control of discharge end DOUT is pulled down to the negative pole B-current potential of battery battery core, forbids that described discharge power switch 120 discharges.
In the existing battery protecting circuit, chip is by conducting and the cut-off of COUT pin control charge switch pipe MN2, and when the protection chip allowed battery charged, chip was drawn high the COUT level near the VDD current potential, transistor MN2 conducting; When the protection chip was forbidden battery charge, chip dragged down COUT near VM, and transistor MN2 ends.
The circuit of existing control Cout output be adopt two transistors control respectively the Cout circuit on draw with drop-down, on when drawing Cout, control the conducting that pulls up transistor by control signal, Cout is output as near VDD, during drop-down Cout, by the conducting of control signal control pull-down transistor, Cout is output as near VM.The control signal of existing this charge switch pipe produces circuit, draws on the control Cout need to produce respectively two control signals when drop-down and pull up transistor and pull-down transistor with control respectively.And when pulling up transistor conducting work, pull-down transistor must end, voltage difference between the source-drain electrode of pull-down transistor is very large at this moment, so pull-down transistor must adopt the high voltage transistor of special construction, the high voltage transistor that increases special construction can increase the complexity of circuit, and can increase chip cost, and pull-down transistor when cut-off, the control signal of pull-down transistor also must be low to moderate the VM current potential, and this generation circuit to the control signal of pull-down transistor is also had higher requirement.
Therefore, be necessary the control signal generation circuit of existing this charge switch pipe is improved.
[summary of the invention]
The object of the present invention is to provide a kind of battery protecting circuit that the charge power switch controlling signal produces circuit that improves.
The object of the present invention is to provide charge power switch controlling signal generation circuit in a kind of battery protecting circuit simple in structure.
For reaching aforementioned purpose; a kind of battery protecting circuit of the present invention; it comprises: the battery protection control circuit; control the charge power switch that battery battery core is charged and the discharge power switch that battery battery core is discharged by the control of battery protection control circuit by the battery protection control circuit; described battery protection control circuit comprises that the control signal of controlling described charge power switch produces circuit; described control signal produces circuit and comprises the controller that produces control signal; be series at switching device and current-limiting resistance between first node and the Section Point; wherein the control end of this switching device is connected in the output of controller; the connected node of switching device and current-limiting resistance is as the output of charge power switch controlling signal in the battery protecting circuit; the level of first node is high level, and the level of Section Point is low level.
According to one embodiment of present invention, described charge power switch comprises the charge switch pipe and parasitizes diode in its body.
According to one embodiment of present invention, described charge switch pipe is field-effect transistor or junction transistor.
According to one embodiment of present invention, described charge switch pipe is nmos fet.
According to one embodiment of present invention; described switching device is the PMOS transistor; the source electrode of switching device is connected in high level; the grid of switching device is connected in the output of controller; accept control signal; the drain electrode of switching device is as the output of charge switch management and control signal processed; current-limiting resistance is series between the output and low level of charge switch management and control signal processed; when allowing charging; described controller output control signal makes the switching device conducting; the output of charge power switch controlling signal output control signal makes the charge power switch conduction in the battery protecting circuit; when forbidding charging; controller output control signal makes the switching device cut-off, and the output of charge power switch controlling signal output control signal is turn-offed the charge power switch in the described battery protecting circuit.
For reaching aforementioned another purpose; the charge power switch controlling signal produces circuit in a kind of battery protecting circuit of the present invention; it comprises: produce control signal controller, be series at switching device and current-limiting resistance between first node and the Section Point; wherein the control end of this switching device is connected in the output of controller; the connected node of switching device and current-limiting resistance is as the output of charge power switch controlling signal in the battery protecting circuit; the level of first node is high level, and the level of Section Point is low level.
According to one embodiment of present invention, described switching device is the PMOS transistor, the source electrode of switching device is connected in high level, the grid of switching device is connected in the output of controller, accept control signal, the drain electrode of switching device is as the output of charge switch management and control signal processed, current-limiting resistance is series between the output and low level of charge switch management and control signal processed, when allowing charging, described controller output control signal makes the switching device conducting, and its output output high level is when forbidding charging, described controller output control signal makes the switching device conducting, its output output low level.
The control signal of charge switch pipe of the present invention produces circuit, it uses one to pull up transistor and the generation circuit of pure resistor as charge switch management and control signal COUT processed, when allowing charging, by the control conducting that pulls up transistor, make charge switch management and control signal output part COUT output processed high level, when forbidding charging, by the discharge path of resistor as charge switch management and control signal output part COUT processed, make charge switch management and control signal output part output low level processed, it is simple that whole control signal produces circuit structure, only need transistor of control, product cost is low.
[description of drawings]
Fig. 1 is the structural representation of battery protecting circuit system.
Fig. 2 is the structural representation of the charge switch management and control signal generating circuit processed of battery protecting circuit of the present invention.
[embodiment]
Alleged " embodiment " or " embodiment " refer to be contained in special characteristic, structure or the characteristic at least one implementation of the present invention herein.Different local in this manual " in one embodiment " that occur not are all to refer to same embodiment, neither be independent or the embodiment mutually exclusive with other embodiment optionally.
Please in conjunction with shown in Figure 1, battery protection system of the present invention comprises battery battery core Bat, resistance R 1, capacitor C 1, battery protecting circuit 110, resistance R 2, charge power switch 130 and discharge power switch 120.Resistance R 1 and capacitor C 1 are series between the anodal B+ and negative pole B-of battery battery core Bat, charge power switch and discharge power switch series are coupled between the negative pole P-of the negative pole B-of battery battery core and battery, and the anodal B+ of battery battery core Bat is directly and between the anodal P+ of battery.
Described charge power switch comprises charge switch pipe Q2 and parasitizes the interior diode D2 of its body.Wherein in one embodiment of the invention, described charge switch pipe Q2 is a NMOS (N-channel Metal Oxide Semiconductor) field effect transistor M N2.Described discharge power switch comprises discharge switch pipe Q1 and parasitizes the interior diode D1 of its body that in one embodiment of the invention, described discharge switch pipe Q1 is nmos fet MN1.The drain electrode of nmos pass transistor MN1 links to each other with the drain electrode of nmos pass transistor MN2, and the source electrode of nmos pass transistor MN1 links to each other with the negative pole B-of battery battery core, and the source electrode of nmos pass transistor MN2 links to each other with the negative pole P-of battery.
Described battery protecting circuit 110 comprises three links (or being called the test side) and two control ends; three links are respectively the anodal B+ link of battery battery core VDD; battery battery core negative pole B-link VSS and battery cathode P-link VM, two control ends are respectively charging control end COUT and control of discharge end DOUT.Wherein link VDD is connected between resistance R 1 and the capacitor C 1, link VSS links to each other with the negative pole B-of battery battery core, link VM is connected in the negative pole P-of battery by resistance R 2, charging control end COUT links to each other with the control end of charge power switch 130, it is the grid of nmos pass transistor MN2, control of discharge end DOUT links to each other with the control end of discharge power switch 120, i.e. the grid of nmos pass transistor MN1.
Described battery protecting circuit 110 can carry out charge protection and discharge prevention to battery battery core Bat.When charging normal, described battery protecting circuit 110 control nmos pass transistor MN2 conductings, nmos pass transistor MN1 cut-off, charging current flows to nmos pass transistor MN2 from the body diode D1 of nmos pass transistor MN1.When charging abnormal (such as charging overcurrent and charging overvoltage), described battery protecting circuit 110 control nmos pass transistor MN2 cut-offs, thus cut off charging process.When carrying out regular picture, described battery protecting circuit 110 control nmos pass transistor MN2 cut-offs, nmos pass transistor MN1 conducting, discharging current flows to nmos pass transistor MN1 from the body diode D2 of nmos pass transistor MN2.When discharge abnormal (such as discharge overcurrent and discharge overvoltage), described battery protecting circuit 110 control nmos pass transistor MN1 cut-offs, thus cut off discharge process.
Described battery protecting circuit 110 judges whether the overcurrent that discharges by the pressure reduction between link VM and the VSS; if differential pressure surpasses predetermined voltage threshold; think that then discharging current surpasses predetermined current threshold; then start the discharge overcurrent protection function; control of discharge end DOUT is pulled down to the negative pole B-current potential of battery battery core, forbids that described discharge power switch 120 discharges.
See also shown in Figure 2ly, it shows the structural representation of charge switch management and control signal generating circuit processed in the battery protecting circuit of the present invention.As shown in Figure 2; charge switch management and control signal circuit processed comprises controller 21, switching device MP1 and the current-limiting resistance R0 that produces control signal in the battery protecting circuit of the present invention; wherein in one embodiment of the invention; described switching device MP1 is the PMOS transistor; the source electrode of transistor MP1 is connected in power vd D; the grid of transistor MP1 is connected in the output of controller; accept control signal S; transistorized drain electrode is as the output of COUT, and current-limiting resistance R0 is series between COUT output and the VM.
Battery protecting circuit is by conducting and the cut-off of COUT control end control charge switch pipe MN2; when the protective circuit permission is charged to battery; the controller 21 output control signal S of charge switch management and control signal generating circuit processed; switching device MP1 conducting this moment; this moment, the output potential of COUT was (VDD-VM) R0/(R0+RMP1); flow through COUT by increase and make COUT output high level to the electric current of resistance between the VM; COUT exports high level; then charge switch pipe Q2 conducting, battery protecting circuit allow battery is charged.
When protective circuit forbade battery charged, the switching device of charge switch management and control signal generating circuit processed turn-offed, this moment COUT output by the resistance between COUT and the VM during drop-down COUT current potential, COUT output low level, then charge switch pipe Q2 cut-off.Battery protecting circuit is forbidden battery is charged.
The control signal of charge switch pipe of the present invention produces circuit, switching device of its use and pure resistor are as the generation circuit of charge switch management and control signal COUT processed, when allowing charging, by the control switch break-over of device, make charge switch management and control signal output part COUT output processed high level, when forbidding charging, by the discharge path of resistor as charge switch management and control signal output part COUT processed, make charge switch management and control signal output part output low level processed, it is simple that whole control signal produces circuit structure, only need transistor of control, product cost is low.
Above-mentioned explanation has fully disclosed the specific embodiment of the present invention.It is pointed out that and be familiar with the scope that any change that the person skilled in art does the specific embodiment of the present invention does not all break away from claims of the present invention.Correspondingly, the scope of claim of the present invention also is not limited only to previous embodiment.
Claims (7)
1. battery protecting circuit; it comprises: the battery protection control circuit; control the charge power switch that battery battery core is charged and the discharge power switch that battery battery core is discharged by the control of battery protection control circuit by the battery protection control circuit; described battery protection control circuit comprises that the control signal of controlling described charge power switch produces circuit; described control signal produces circuit and comprises the controller that produces control signal; be series at switching device and current-limiting resistance between first node and the Section Point; wherein the control end of this switching device is connected in the output of controller; the connected node of switching device and current-limiting resistance is as the output of charge power switch controlling signal in the battery protecting circuit; the level of first node is high level, and the level of Section Point is low level.
2. battery protecting circuit as claimed in claim 1 is characterized in that: described charge power switch comprises the charge switch pipe and parasitizes diode in its body.
3. battery protecting circuit as claimed in claim 2, it is characterized in that: described charge switch pipe is field-effect transistor or junction transistor.
4. battery protecting circuit as claimed in claim 3, it is characterized in that: described charge switch pipe is nmos fet.
5. battery protecting circuit as claimed in claim 1; it is characterized in that: described switching device is the PMOS transistor; the source electrode of switching device is connected in high level; the grid of switching device is connected in the output of controller; accept control signal; the drain electrode of switching device is as the output of charge switch management and control signal processed; current-limiting resistance is series between the output and low level of charge switch management and control signal processed; when allowing charging; described controller output control signal makes the switching device conducting; the output of charge power switch controlling signal output control signal makes the charge power switch conduction in the battery protecting circuit; when forbidding charging; controller output control signal makes the switching device cut-off, and the output of charge power switch controlling signal output control signal is turn-offed the charge power switch in the described battery protecting circuit.
6. the charge power switch controlling signal produces circuit in the battery protecting circuit; it comprises: produce control signal controller, be series at switching device and current-limiting resistance between first node and the Section Point; wherein the control end of this switching device is connected in the output of controller; the connected node of switching device and current-limiting resistance is as the output of charge power switch controlling signal in the battery protecting circuit; the level of first node is high level, and the level of Section Point is low level.
7. the charge power switch controlling signal produces circuit in the battery protecting circuit as claimed in claim 6; it is characterized in that: described switching device is the PMOS transistor; the source electrode of switching device is connected in high level; the grid of switching device is connected in the output of controller; accept control signal; the drain electrode of switching device is as the output of charge switch management and control signal processed; current-limiting resistance is series between the output and low level of charge switch management and control signal processed; when allowing charging; described controller output control signal makes the switching device conducting; its output output high level; when forbidding charging; described controller output control signal makes the switching device conducting, its output output low level.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210484658.5A CN102983557B (en) | 2012-11-23 | 2012-11-23 | Battery protective circuit and charging power switch control signal producing circuit thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210484658.5A CN102983557B (en) | 2012-11-23 | 2012-11-23 | Battery protective circuit and charging power switch control signal producing circuit thereof |
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| CN102983557A true CN102983557A (en) | 2013-03-20 |
| CN102983557B CN102983557B (en) | 2015-03-11 |
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| CN201210484658.5A Active CN102983557B (en) | 2012-11-23 | 2012-11-23 | Battery protective circuit and charging power switch control signal producing circuit thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103219709A (en) * | 2013-04-18 | 2013-07-24 | 无锡中星微电子有限公司 | Battery protective circuit with single charge-discharge power tube |
| CN107300673A (en) * | 2016-04-15 | 2017-10-27 | 福特全球技术公司 | Battery from overcurrent diagnostic system |
| CN109617184A (en) * | 2018-12-29 | 2019-04-12 | 维沃移动通信有限公司 | A kind of booster circuit and terminal |
| WO2019085233A1 (en) * | 2017-10-31 | 2019-05-09 | 深圳易马达科技有限公司 | Power supply device and battery protection circuit thereof |
| CN112583078A (en) * | 2020-12-17 | 2021-03-30 | 西安稳先半导体科技有限责任公司 | Battery pack, battery protection chip and electronic product |
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| CN201341019Y (en) * | 2008-12-03 | 2009-11-04 | 何岳明 | Charge and discharge protection circuit of multi-cell lithium battery |
| CN201349126Y (en) * | 2008-09-23 | 2009-11-18 | 陈赖容 | Protective circuit board of lead-acid battery pack for electrically driven vehicle |
| US7830120B2 (en) * | 2007-09-18 | 2010-11-09 | Nexergy, Inc. | Low side N-channel FET protection circuit |
| CN202930921U (en) * | 2012-11-23 | 2013-05-08 | 无锡中星微电子有限公司 | Battery protection circuit and charging power switch control signal generation circuit thereof |
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| US7830120B2 (en) * | 2007-09-18 | 2010-11-09 | Nexergy, Inc. | Low side N-channel FET protection circuit |
| CN101378190A (en) * | 2008-09-23 | 2009-03-04 | 陈赖容 | Protection circuit board for lead-acid battery of electric vehicle |
| CN201349126Y (en) * | 2008-09-23 | 2009-11-18 | 陈赖容 | Protective circuit board of lead-acid battery pack for electrically driven vehicle |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103219709A (en) * | 2013-04-18 | 2013-07-24 | 无锡中星微电子有限公司 | Battery protective circuit with single charge-discharge power tube |
| CN103219709B (en) * | 2013-04-18 | 2015-04-15 | 无锡中星微电子有限公司 | Battery protective circuit with single charge-discharge power tube |
| CN107300673A (en) * | 2016-04-15 | 2017-10-27 | 福特全球技术公司 | Battery from overcurrent diagnostic system |
| CN107300673B (en) * | 2016-04-15 | 2021-03-19 | 福特全球技术公司 | Battery overcurrent diagnosis system |
| WO2019085233A1 (en) * | 2017-10-31 | 2019-05-09 | 深圳易马达科技有限公司 | Power supply device and battery protection circuit thereof |
| CN109617184A (en) * | 2018-12-29 | 2019-04-12 | 维沃移动通信有限公司 | A kind of booster circuit and terminal |
| CN112583078A (en) * | 2020-12-17 | 2021-03-30 | 西安稳先半导体科技有限责任公司 | Battery pack, battery protection chip and electronic product |
| CN112583078B (en) * | 2020-12-17 | 2022-06-21 | 西安稳先半导体科技有限责任公司 | Battery pack, battery protection chip and electronic product |
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| CN102983557B (en) | 2015-03-11 |
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Address after: A 530 Taihu international science and Technology Park building 214135 Qingyuan Road in Jiangsu province Wuxi City District 10 layer Patentee after: WUXI ZHONGGAN MICROELECTRONIC CO., LTD. Address before: A 530 Taihu international science and Technology Park building 214135 Qingyuan Road in Jiangsu province Wuxi City District 10 layer Patentee before: Wuxi Vimicro Co., Ltd. |
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Effective date of registration: 20170523 Address after: Spark Road 210061 Jiangsu province Nanjing city high tech Development Zone No. 17 Powerise Building 1 building B block 16 layer Patentee after: Nanjing Sino Microelectronics Co., Ltd. Address before: A 530 Taihu international science and Technology Park building 214135 Qingyuan Road in Jiangsu province Wuxi City District 10 layer Patentee before: WUXI ZHONGGAN MICROELECTRONIC CO., LTD. |