CN202930921U - Battery protection circuit and charging power switch control signal generation circuit thereof - Google Patents
Battery protection circuit and charging power switch control signal generation circuit thereof Download PDFInfo
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- CN202930921U CN202930921U CN 201220629021 CN201220629021U CN202930921U CN 202930921 U CN202930921 U CN 202930921U CN 201220629021 CN201220629021 CN 201220629021 CN 201220629021 U CN201220629021 U CN 201220629021U CN 202930921 U CN202930921 U CN 202930921U
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Abstract
The utility model provides a battery protection circuit of an improved charging power switch control signal generation circuit. The control signal generation circuit comprises a controller used to generate a control signal, a switch member, and a current-limiting resistor. The switch member comprises three ends. A control end is connected with an output end of the controller, one end of the above mentioned three ends is connected with a high level, and the other end of the above mentioned three ends is connected with one end of the current-limiting resistor. The other end of the current-limiting resistor is connected with the low level. A connection node of the switch member and the current-limiting resistor can be used as the output end of the charging power switch control signal of the battery protection circuit. When the charging is allowed, the controller can be used to output the control signal to switch on the switch member, and the output end of the charging power switch control signal of the battery protection circuit can be used to output the control signal to switch on the charging power switch. When the charging is forbidden, the controller can be used to output the control signal to stop the switch member, the output end of the charging power switch control signal of the battery protection circuit can be used to output the control signal to switch off the charging power switch.
Description
[technical field]
The utility model relates to electronic circuit field, particularly produces 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 controlling according to the charging and discharging state of battery when lithium battery being charged, and 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 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 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 capacitor C 1, link VSS is connected 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 is connected with the control end of charge power switch 130, it is the 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 is controlled nmos pass transistor MN2 conducting, nmos pass transistor MN1 cut-off, and 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 is controlled nmos pass transistor MN2 cut-off, thereby has cut off charging process.When carrying out regular picture, described battery protecting circuit 110 is controlled nmos pass transistor MN2 cut-off, nmos pass transistor MN1 conducting, and 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 is controlled nmos pass transistor MN1 cut-off, thereby 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 surpasses predetermined voltage threshold; think that discharging current surpasses predetermined current threshold; 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 existing battery protecting circuit, chip is controlled conducting and the cut-off of charge switch pipe MN2 by the COUT pin, and when the protection chip allowed battery is charged, chip was drawn high the COUT level near the VDD current potential, transistor MN2 conducting; When the protection chip when forbidding battery charge, chip drags 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 by control signal the conducting that pulls up transistor, Cout is output as near VDD, during drop-down Cout, control the pull-down transistor conducting by control signal, Cout is output as near VM.The control signal of existing this charge switch pipe produces circuit, controls to draw on Cout need to produce respectively two control signals when drop-down and pull up transistor and pull-down transistor to 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.
[utility model content]
The purpose of this utility model is to provide a kind of battery protecting circuit that the charge power switch controlling signal produces circuit that improves.
The purpose of this utility model 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 utility model, it comprises: the battery protection control circuit, control the charge power switch that battery battery core is charged and controlled the discharge power switch that battery battery core is discharged by the 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 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 battery protecting circuit, the level of first node is high level, the level of Section Point is low level.
According to an embodiment of the present utility model, described charge power switch comprises the charge switch pipe and parasitizes the interior diode of its body.
According to an embodiment of the present utility model, described charge switch pipe is field-effect transistor or junction transistor.
According to an embodiment of the present utility model, described charge switch pipe is nmos fet.
according to an embodiment of the present utility model, 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, in battery protecting circuit, the output of charge power switch controlling signal output control signal makes the charge power switch conduction, when forbidding charging, controller output control signal makes the switching device cut-off, in described battery protecting circuit, the output of charge power switch controlling signal output control signal is turn-offed the charge power switch.
For reaching aforementioned another purpose; in a kind of battery protecting circuit of the utility model, the charge power switch controlling signal produces circuit; it comprises: produce control signal controller, be series at switching device and current-limiting resistance between first node and 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 battery protecting circuit; the level of first node is high level, and the level of Section Point is low level.
according to an embodiment of the present utility model, 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.
the control signal of charge switch pipe of the present utility model 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 to control a transistor, 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 utility model.
[embodiment]
Alleged " embodiment " or " embodiment " refer to be contained in special characteristic, structure or the characteristic at least one implementation of the utility model 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 utility model 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 an embodiment of the present utility model, described charge switch pipe Q2 is a NMOS (N-channelMetal Oxide Semiconductor) field effect transistor M N2.Described discharge power switch comprises discharge switch pipe Q1 and the diode D1 that parasitizes in its body, and in an embodiment of the present utility model, 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 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 capacitor C 1, link VSS is connected 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 is connected with the control end of charge power switch 130, it is the 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 is controlled nmos pass transistor MN2 conducting, nmos pass transistor MN1 cut-off, and 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 is controlled nmos pass transistor MN2 cut-off, thereby has cut off charging process.When carrying out regular picture, described battery protecting circuit 110 is controlled nmos pass transistor MN2 cut-off, nmos pass transistor MN1 conducting, and 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 is controlled nmos pass transistor MN1 cut-off, thereby 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 surpasses predetermined voltage threshold; think that discharging current surpasses predetermined current threshold; 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 battery protecting circuit of the present utility model.As shown in Figure 2; in battery protecting circuit of the present utility model, charge switch management and control signal circuit processed comprises controller 21, switching device MP1 and the current-limiting resistance R0 that produces control signal; wherein in an embodiment of the present utility model; 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 VM.
Battery protecting circuit is controlled conducting and the cut-off of charge switch pipe MN2 by the COUT control end; when protective circuit allows battery is charged; 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 VM; COUT exports high level; charge switch pipe Q2 conducting, battery protecting circuit allow battery is charged.
When protective circuit forbade battery is 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 VM during drop-down COUT current potential, COUT output low level, charge switch pipe Q2 cut-off.Battery protecting circuit is forbidden battery is charged.
the control signal of charge switch pipe of the present utility model 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 to control a transistor, product cost is low.
Above-mentioned explanation has fully disclosed embodiment of the present utility model.It is pointed out that being familiar with any change that the person skilled in art does embodiment of the present utility model does not all break away from the scope of claims of the present utility model.Correspondingly, the scope of claim of the present utility model 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 controlled the discharge power switch that battery battery core is discharged by the 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 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 battery protecting circuit, the level of first node is high level, 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, in battery protecting circuit, the output of charge power switch controlling signal output control signal makes the charge power switch conduction, when forbidding charging, controller output control signal makes the switching device cut-off, in described battery protecting circuit, the output of charge power switch controlling signal output control signal is turn-offed the charge power switch.
6. in a battery protecting circuit, the charge power switch controlling signal produces circuit; it comprises: produce control signal controller, be series at switching device and current-limiting resistance between first node and 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 battery protecting circuit; the level of first node is high level, and the level of Section Point is low level.
7. in battery protecting circuit as claimed in claim 6, the charge power switch controlling signal produces circuit, 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220629021 CN202930921U (en) | 2012-11-23 | 2012-11-23 | Battery protection circuit and charging power switch control signal generation circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220629021 CN202930921U (en) | 2012-11-23 | 2012-11-23 | Battery protection circuit and charging power switch control signal generation circuit thereof |
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| Publication Number | Publication Date |
|---|---|
| CN202930921U true CN202930921U (en) | 2013-05-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220629021 Withdrawn - After Issue CN202930921U (en) | 2012-11-23 | 2012-11-23 | Battery protection circuit and charging power switch control signal generation circuit thereof |
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|---|---|
| CN (1) | CN202930921U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102983557A (en) * | 2012-11-23 | 2013-03-20 | 无锡中星微电子有限公司 | Battery protective circuit and charging power switch control signal producing circuit thereof |
-
2012
- 2012-11-23 CN CN 201220629021 patent/CN202930921U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102983557A (en) * | 2012-11-23 | 2013-03-20 | 无锡中星微电子有限公司 | Battery protective circuit and charging power switch control signal producing circuit thereof |
| CN102983557B (en) * | 2012-11-23 | 2015-03-11 | 无锡中星微电子有限公司 | Battery protective circuit and charging power switch control signal producing circuit thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130508 Effective date of abandoning: 20150311 |
|
| RGAV | Abandon patent right to avoid regrant |