CN102983557B - 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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- CN102983557B CN102983557B CN201210484658.5A CN201210484658A CN102983557B CN 102983557 B CN102983557 B CN 102983557B CN 201210484658 A CN201210484658 A CN 201210484658A CN 102983557 B CN102983557 B CN 102983557B
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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 the improvement of circuit about charge power switch controlling signal in a kind of battery protecting circuit.
[background technology]
As shown in Figure 1, existing lithium battery, when charging, can arrange one piece of charge protection chip usually, is used for controlling when to charge to lithium battery according to the charging and discharging state 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 R1, electric capacity C1, battery protecting circuit 110, resistance R2, charge power switch 130 and discharge power switch 120.Resistance R1 and electric capacity C1 is series between the positive pole B+ of battery battery core Bat and negative pole B-, charge power switch and discharge power switch series are coupled between the negative pole B-of battery battery core and the negative pole P-of battery, and the positive pole B+ of battery battery core Bat is directly and between the positive pole P+ of battery.
Described discharge power switch comprises NMOS (N-channel Metal Oxide Semiconductor) field effect transistor M N1 and parasitizes the diode D1 in its body.Described charge power switch comprises nmos fet MN2 and parasitizes the diode D2 in its body.The drain electrode of nmos pass transistor MN1 is connected with the drain electrode of nmos pass transistor MN2, and the source electrode of nmos pass transistor MN1 is connected with the negative pole B-of battery battery core, and the source electrode of nmos pass transistor MN2 is connected with the negative pole P-of battery.
Described battery protecting circuit 110 comprises three links (or being called test side) and two control ends; three links are respectively battery battery core positive pole B+ link 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 R1 and electric capacity C1, link VSS is connected with the negative pole B-of battery battery core, link VM is connected to the negative pole P-of battery by resistance R2, charging control end COUT is connected with the control end of charge power switch 130, the i.e. grid of nmos pass transistor MN2, control of discharge end DOUT is connected 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 controls nmos pass transistor MN2 conducting, and nmos pass transistor MN1 ends, and charging current flows to nmos pass transistor MN2 from the body diode D1 of nmos pass transistor MN1.When generation of charging abnormal (such as charge overcurrent and charging overvoltage), described battery protecting circuit 110 controls nmos pass transistor MN2 to be ended, thus has cut off charging process.When carrying out regular picture, described battery protecting circuit 110 controls nmos pass transistor MN2 to be ended, and nmos pass transistor MN1 conducting, discharging current flows to nmos pass transistor MN1 from the body diode D2 of nmos pass transistor MN2.When generation of discharging abnormal (such as discharge overcurrent and electric discharge overvoltage), described battery protecting circuit 110 controls nmos pass transistor MN1 to be ended, thus has cut off discharge process.
Described battery protecting circuit 110 judges whether by the pressure reduction between link VM and VSS the overcurrent that discharges; if differential pressure exceedes predetermined voltage threshold; then think that discharging current exceedes predetermined current threshold; then star t-up 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 existing battery protecting circuit, chip controls conducting and the cut-off of charge switch pipe MN2 by COUT pin, and when protect IC allows to charge to battery, chip draws high COUT level to close to VDD current potential, transistor MN2 conducting; When protect IC is forbidden charging to battery, chip drags down COUT to close to VM, and transistor MN2 ends.
The circuit that existing control Cout exports is employing two transistors pull-up of control Cout circuit and drop-down respectively, during pull-up Cout, control to pull up transistor conducting by control signal, the output of Cout is made to be close to VDD, during drop-down Cout, control pull-down transistor conducting by control signal, make the output of Cout be close to VM.The control signal of existing this charge switch pipe produces circuit, control Cout pull-up and drop-down time need to produce two control signals respectively to control respectively to pull up transistor and pull-down transistor.And when pull up transistor ON operation time, pull-down transistor must end, voltage difference between the source-drain electrode of now pull-down transistor is very large, so pull-down transistor must adopt the high voltage transistor of special construction, the high voltage transistor increasing special construction can increase the complexity of circuit, and can chip cost be increased, and during pull-down transistor cut-off, the control signal of pull-down transistor also must be low to moderate VM current potential, and this it is also proposed higher requirement to the generation circuit of the control signal of pull-down transistor.
Therefore, be necessary that producing circuit to the control signal of existing this charge switch pipe improves.
[summary of the invention]
The object of the present invention is to provide a kind of battery protecting circuit improving charge power switch controlling signal generation circuit.
Charge power switch controlling signal in the simple battery protecting circuit of a kind of structure is the object of the present invention is to provide to produce circuit.
For reaching aforementioned object, a kind of battery protecting circuit of the present invention, it comprises: battery protection control circuit, control by battery protection control circuit charge power switch that battery battery core is charged and controlled discharge power switch that battery battery core is discharged by battery protection control circuit, described battery protection control circuit comprises the control signal controlling described charge power switch and produces circuit, described control signal produces circuit and comprises the controller producing control signal, be series at the switching device between first node and Section Point and current-limiting resistance, wherein the control end of this switching device is connected to 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 battery protecting circuit, the level of first node is high level, the level of Section Point is low level.
According to one embodiment of present invention, described charge power switch comprises charge switch pipe and parasitizes the 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 PMOS transistor, the source electrode of switching device is connected to high level, the grid of switching device is connected to the output of controller, accept control signal, the drain electrode of switching device is as the output of charge switch pipe control signal, between the output that current-limiting resistance is series at charge switch pipe control signal and low level, when allowing charging, described controller exports control signal and makes switch device conductive, in battery protecting circuit, the output of charge power switch controlling signal exports control signal and makes charge power switch conduction, when forbidding charging, controller exports control signal makes switching device end, in described battery protecting circuit, the output of charge power switch controlling signal exports control signal and makes charge power switch OFF.
For reaching another object aforementioned; in a kind of battery protecting circuit of the present invention, charge power switch controlling signal produces circuit; it comprises: produce the controller of control signal, be series at switching device between first node and Section Point and current-limiting resistance; wherein the control end of this switching device is connected to 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 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 PMOS transistor, the source electrode of switching device is connected to high level, the grid of switching device is connected to the output of controller, accept control signal, the drain electrode of switching device is as the output of charge switch pipe control signal, between the output that current-limiting resistance is series at charge switch pipe control signal and low level, when allowing charging, described controller exports control signal and makes switch device conductive, its output exports high level, when forbidding charging, described controller exports control signal and makes switch device conductive, 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 pipe control signal COUT, when allowing charging, by controlling to pull up transistor conducting, charge switch management and control signal output part COUT is made to export high level, when forbidding charging, by the discharge path of resistor as charge switch management and control signal output part COUT, make charge switch management and control signal output part output low level, it is simple that whole control signal produces circuit structure, only need control transistor, product cost is low.
[accompanying drawing explanation]
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 of battery protecting circuit of the present invention.
[embodiment]
Alleged herein " embodiment " or " embodiment " refers to special characteristic, structure or the characteristic that can be contained at least one implementation of the present invention.Different local in this manual " in one embodiment " occurred not all refers to same embodiment, neither be independent or optionally mutually exclusive with other embodiments embodiment.
Shown in Fig. 1, battery protection system of the present invention comprises battery battery core Bat, resistance R1, electric capacity C1, battery protecting circuit 110, resistance R2, charge power switch 130 and discharge power switch 120.Resistance R1 and electric capacity C1 is series between the positive pole B+ of battery battery core Bat and negative pole B-, charge power switch and discharge power switch series are coupled between the negative pole B-of battery battery core and the negative pole P-of battery, and the positive pole B+ of battery battery core Bat is directly and between the positive pole P+ of battery.
Described charge power switch comprises charge switch pipe Q2 and parasitizes the diode D2 in its body.Wherein in one embodiment of the invention, described charge switch pipe Q2 is a NMOS (N-channel MetalOxide Semiconductor) field effect transistor M N2.Described discharge power switch comprises discharge switch pipe Q1 and parasitizes the diode D1 in its body, and in one embodiment of the invention, described discharge switch pipe Q1 is nmos fet MN1.The drain electrode of nmos pass transistor MN1 is connected with the drain electrode of nmos pass transistor MN2, and the source electrode of nmos pass transistor MN1 is connected with the negative pole B-of battery battery core, and the source electrode of nmos pass transistor MN2 is connected with the negative pole P-of battery.
Described battery protecting circuit 110 comprises three links (or being called test side) and two control ends; three links are respectively battery battery core positive pole B+ link 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 R1 and electric capacity C1, link VSS is connected with the negative pole B-of battery battery core, link VM is connected to the negative pole P-of battery by resistance R2, charging control end COUT is connected with the control end of charge power switch 130, the i.e. grid of nmos pass transistor MN2, control of discharge end DOUT is connected 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 controls nmos pass transistor MN2 conducting, and nmos pass transistor MN1 ends, and charging current flows to nmos pass transistor MN2 from the body diode D1 of nmos pass transistor MN1.When generation of charging abnormal (such as charge overcurrent and charging overvoltage), described battery protecting circuit 110 controls nmos pass transistor MN2 to be ended, thus has cut off charging process.When carrying out regular picture, described battery protecting circuit 110 controls nmos pass transistor MN2 to be ended, and nmos pass transistor MN1 conducting, discharging current flows to nmos pass transistor MN1 from the body diode D2 of nmos pass transistor MN2.When generation of discharging abnormal (such as discharge overcurrent and electric discharge overvoltage), described battery protecting circuit 110 controls nmos pass transistor MN1 to be ended, thus has cut off discharge process.
Described battery protecting circuit 110 judges whether by the pressure reduction between link VM and VSS the overcurrent that discharges; if differential pressure exceedes predetermined voltage threshold; then think that discharging current exceedes predetermined current threshold; then star t-up 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.
Refer to shown in Fig. 2, it shows the structural representation of charge switch management and control signal generating circuit in battery protecting circuit of the present invention.As shown in Figure 2; in battery protecting circuit of the present invention, charge switch management and control signal circuit comprises the controller 21, the switching device MP1 and current-limiting resistance R0 that produce control signal; wherein in one embodiment of the invention; described switching device MP1 is PMOS transistor; the source electrode of transistor MP1 is connected to power vd D; the grid of transistor MP1 is connected to the output of controller; accept control signal S; the drain electrode of transistor is as the output of COUT, and current-limiting resistance R0 is series between COUT output and VM.
Battery protecting circuit controls conducting and the cut-off of charge switch pipe MN2 by COUT control end; when protective circuit allows to charge to battery; the controller 21 of charge switch management and control signal generating circuit exports control signal S; now switching device MP1 conducting; now the output potential of COUT is (VDD-VM) R0/(R0+RMP1); flowing through the electric current of resistance between COUT to VM by increase makes COUT export high level; COUT exports high level; then charge switch pipe Q2 conducting, battery protecting circuit allows to charge to battery.
When protective circuit forbids charging to battery, the switching device of charge switch management and control signal generating circuit turns off, and now the output of COUT is by COUT current potential drop-down during the resistance between COUT and VM, and COUT output low level, then charge switch pipe Q2 ends.Battery protecting circuit is forbidden charging to battery.
The control signal of charge switch pipe of the present invention produces circuit, it uses a switching device and pure resistor as the generation circuit of charge switch pipe control signal COUT, when allowing charging, by control switch break-over of device, charge switch management and control signal output part COUT is made to export high level, when forbidding charging, by the discharge path of resistor as charge switch management and control signal output part COUT, make charge switch management and control signal output part output low level, it is simple that whole control signal produces circuit structure, only need control transistor, product cost is low.
Above-mentioned explanation fully discloses the specific embodiment of the present invention.It is pointed out that the scope be familiar with person skilled in art and any change that the specific embodiment of the present invention is done all do not departed to claims of the present invention.Correspondingly, the scope of claim of the present invention is also not limited only to previous embodiment.
Claims (5)
1. a battery protecting circuit, it comprises: battery protection control circuit, control by battery protection control circuit charge power switch that battery battery core is charged and controlled discharge power switch that battery battery core is discharged by battery protection control circuit, described battery protection control circuit comprises the control signal controlling described charge power switch and produces circuit, described control signal produces circuit and comprises the controller producing control signal, be series at the switching device between first node and Section Point and current-limiting resistance, wherein the control end of this switching device is connected to 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 battery protecting circuit, the level of first node is high level, the level of Section Point is low level,
Described switching device is PMOS transistor, the source electrode of switching device is connected to high level, the grid of switching device is connected to the output of controller, accept control signal, the drain electrode of switching device is as the output of charge switch pipe control signal, between the output that current-limiting resistance is series at charge switch pipe control signal and low level, when allowing charging, described controller exports control signal and makes switch device conductive, in battery protecting circuit, the output of charge power switch controlling signal exports control signal and makes charge power switch conduction, when forbidding charging, controller exports control signal makes switching device end, in described battery protecting circuit, the output of charge power switch controlling signal exports control signal and makes charge power switch OFF.
2. battery protecting circuit as claimed in claim 1, is characterized in that: described charge power switch comprises charge switch pipe and parasitizes the diode in its body.
3. battery protecting circuit as claimed in claim 2, is characterized in that: described charge switch pipe is field-effect transistor or junction transistor.
4. battery protecting circuit as claimed in claim 3, is characterized in that: described charge switch pipe is nmos fet.
5. in a battery protecting circuit, charge power switch controlling signal produces circuit; it comprises: produce the controller of control signal, be series at switching device between first node and Section Point and current-limiting resistance; wherein the control end of this switching device is connected to 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 battery protecting circuit; the level of first node is high level; the level of Section Point is low level
Described switching device is PMOS transistor, the source electrode of switching device is connected to high level, the grid of switching device is connected to the output of controller, accept control signal, the drain electrode of switching device is as the output of charge switch pipe control signal, between the output that current-limiting resistance is series at charge switch pipe control signal and low level, when allowing charging, described controller exports control signal and makes switch device conductive, its output exports high level, when forbidding charging, described controller exports control signal makes switching device end, its output output low level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 CN102983557A (en) | 2013-03-20 |
| CN102983557B true 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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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| US9707855B1 (en) * | 2016-04-15 | 2017-07-18 | Ford Global Technologies, Llc | Battery overcurrent diagnostic system |
| CN207475228U (en) * | 2017-10-31 | 2018-06-08 | 深圳易马达科技有限公司 | It is a kind of to supply electric installation and its battery protecting circuit |
| 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 |
| 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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| CN101378190A (en) * | 2008-09-23 | 2009-03-04 | 陈赖容 | Protection circuit board for lead-acid battery of electric vehicle |
| 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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2012
- 2012-11-23 CN CN201210484658.5A patent/CN102983557B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN201341019Y (en) * | 2008-12-03 | 2009-11-04 | 何岳明 | Charge and discharge protection circuit of multi-cell lithium battery |
| 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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| CN102983557A (en) | 2013-03-20 |
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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. |
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