CN202663092U - Circuit protecting battery against overcharge - Google Patents
Circuit protecting battery against overcharge Download PDFInfo
- Publication number
- CN202663092U CN202663092U CN 201220190367 CN201220190367U CN202663092U CN 202663092 U CN202663092 U CN 202663092U CN 201220190367 CN201220190367 CN 201220190367 CN 201220190367 U CN201220190367 U CN 201220190367U CN 202663092 U CN202663092 U CN 202663092U
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model discloses a circuit protecting a battery against overcharge. The circuit protecting the battery against overcharge comprises a charging switching circuit and a voltage sampling and controlling circuit, wherein the charging switching circuit further comprises a first resistor, a second resistor, a third resistor, a first MOS switch tube and a first triode, and the voltage sampling and controlling circuit further comprises a fourth resistor, a fifth resistor and a first control unit. The voltage sampling and controlling circuit is used for monitoring the voltage of the battery; when the battery is not fully charged, according to the voltage value of the battery, a control terminal of the voltage sampling and controlling circuit outputs PWM charging pulses at certain duty ratio, thereby controlling the charging switching circuit, and ensuring that a charging circuit charges the battery with the PWM pulses at certain duty ratio; and the when the battery is determined to be fully charged according to sampled voltage value, the voltage sampling and controlling circuit outputs signals to switch off the charging switching circuit, thereby switching off the first MOS switch tube. The circuit protecting the battery against overcharge provided in the utility model has the advantages of simple structure, low cost, and good stability.
Description
Technical field
The utility model relates to power technique fields, is specifically related to a kind of battery overcharge protective circuit.
Background technology
Along with the raising to the portable requirement of electronic product, adopt battery more and more as the electronic product of power supply, to having higher requirement the useful life of battery, in order to postpone the useful life of electronic product, generally adopt rechargeable battery.
In battery charging process, if battery electric quantity is full of, if do not detected control, then will proceed charging, be in for a long time the state of overcharging, can cause battery aging phenomenon to occur, the life-span reduces greatly.In the prior art, general charge protector all use the special integrated circuit that charges, and the consideration aspect some all do not have the over-charging of battery electric protection cheaply in the charge protector.
Summary of the invention
The purpose of this utility model is to provide a kind of battery overcharge protective circuit, be used for providing a kind of simple in structure, cost is low, the battery overcharge protective circuit of good stability.
For achieving the above object, the technical solution of the utility model is:
A kind of battery overcharge protective circuit, comprise charge switch circuit and voltage sample and control circuit, described charge switch circuit further comprises the first resistance, the second resistance, the 3rd resistance, the one MOS switching tube and the first triode, described voltage sample and control circuit further comprise the 4th resistance, the 5th resistance and the first control unit, described voltage sample and control circuit are used for the monitoring cell voltage, when battery charging also less than the time, size according to battery voltage value, described voltage sample and control circuit control end are exported the PWM charging pulse of certain duty ratio, control described charge switch circuit, guarantee that charging circuit charges the battery with the pwm pulse of certain duty ratio all the time; When judging that according to sample voltage value the battery charging has been full of, described voltage sample and control circuit output signal are turn-offed described charge switch circuit, then turn-off a MOS switching tube, charge circuit cuts off, charging circuit stops battery being charged, and then has avoided the generation of battery overcharge situation.
Preferably, the first resistance one end of described current monitoring circuit is connected with the source class of a MOS switching tube, jointly be connected with the anode of charging circuit, the other end of the first resistance is connected with the collector electrode of the first triode and the grid of a MOS switching tube, the base stage of the first triode is connected with an end of the second resistance and an end of the 3rd resistance, the other end of the second resistance is connected with a pin of the first control unit, the other end of the 3rd resistance is connected with the emitting stage of the first triode, and jointly be connected with ground, the drain electrode of a MOS switching tube is connected with the anode of battery through the first diode.
Preferably, described triode is selected NPN type triode.
Preferably, described MOS switching tube is selected P type MOS switching tube.
Preferably, an end of the 4th resistance is connected with the battery anode, and the other end of the 4th resistance is connected with an end of the 5th resistance, and the other end of the 5th resistance is connected with ground, and the sampling end of the first control unit is connected with the 5th resistance with the 4th resistance.
Preferably, described the first control unit is the single-chip microcomputer with AD sampling module.
Preferably, it is characterized in that described the first control unit is the single-chip microcomputer with PWM control output.
By adopting above technical scheme, the beneficial effects of the utility model are:
(1) adopt single-chip microcomputer to detect cell voltage, the mode of control switch element realizes the over-charging of battery electric protection, has simplified circuit design, improves circuit reliability.
(2) adopt metal-oxide-semiconductor as switch element, improved the response speed of switching over.
(3) adopt the mode of pwm pulse to charge the battery, the useful life of protection battery.
Description of drawings
Fig. 1 is the theory diagram of the utility model embodiment battery overcharge protective circuit.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
On the contrary, the utility model contain any by claim definition in substituting of making of marrow of the present utility model and scope, modification, equivalent method and scheme.Further, in order to make the public the utility model is had a better understanding, in hereinafter details of the present utility model being described, detailed some specific detail sections of having described.There is not for a person skilled in the art the description of these detail sections can understand the utility model fully yet.
Referring to Fig. 1, the battery overcharge protective circuit 100 of the utility model embodiment comprises charge switch circuit 101 and voltage sample and control circuit 102, and wherein charging circuit 200 gives battery 300 chargings through battery overcharge protective circuit 100.When battery underfill electricity, charge switch circuit 101 is opened, charging circuit 200 charges to battery 300 through a MOS switching tube M1 and the first diode D1, voltage sample and control circuit 102 sampling battery voltage values, and produce the PWM charging pulse of different duty, conducting and the closure of control charge switch circuit according to battery voltage value.Cell voltage is through the 4th resistance R 4 and the 5th resistance R 5 dividing potential drops, the first control unit U1 is by this magnitude of voltage of sampling, according to this magnitude of voltage, the PWM ripple of the first control unit output different duty is controlled the switch of the first triode T1, and then control cut-offfing of a MOS switching tube M1, namely control charging circuit to the charging pulse of battery, when battery voltage value is little, the PWM duty ratio is a little bigger, when battery voltage value large, PWM duty ratio point, be in the state that is full of electricity when the first control unit detects battery, then turn-off a MOS switching tube M1, charge circuit cuts off, charging circuit stops battery being charged, and then has avoided the generation of battery overcharge situation.When cell voltage drops to a certain degree, the first control unit continues to charge the battery with certain Duty ratio control charging circuit.
The first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the one MOS switching tube M1 and the first triode T1 form charge switch circuit 101, the first resistance R 1 one ends are connected with the source class of a MOS switching tube M1, jointly be connected with the anode of charging circuit 200, the other end of the first resistance R 1 is connected with the collector electrode of the first triode T1 and the grid of a MOS switching tube M1, the base stage of the first triode T1 is connected with an end of the second resistance R 2 and an end of the 3rd resistance R 3, the other end of the second resistance R 2 is connected with the pin of the first control unit U1, the other end of the 3rd resistance R 3 is connected with the emitting stage of the first triode T1, and jointly be connected with ground, the drain electrode of the one MOS switching tube M1 is connected with the anode of battery 300 through the first diode D1, the first triode T1 selects NPN type triode, and a MOS switching tube M1 selects P type MOS switching tube, and it is IRF9540 that present embodiment is selected model, cut-in voltage Vgs (th)=-4V, i.e. the grid voltage V of M1
G＜source voltage V
S, and V
G-V
SDuring＜-4V, the M1 conducting, its operation principle is as follows, when the first control unit U1 control end output high level signal, according to the operation principle of NPN triode, the first triode T1 conducting, then this moment the one MOS switching tube the almost nil voltage of grid voltage, and source class is charging voltage output, Vgs＜-4V, the one MOS switching tube M1 conducting, charging circuit 200 charges to battery 300 through M1 and D1.On the contrary, when the first control unit U1 control end output low level signal, the first triode T1 cut-off, then the grid voltage of a MOS switching tube equates Vgs=0 with charging circuit 200 output voltages at this moment, the one MOS switching tube M1 cut-off disconnects the charging of 200 pairs of batteries 300 of charging circuit.
The 4th resistance R 4, the 5th resistance R 5 and the first control unit U1 form voltage sample and control circuit 102, one end of the 4th resistance R 4 is connected with battery 300 anodes, the other end of the 4th resistance R 4 is connected with an end of the 5th resistance R 5, the other end of the 5th resistance R 5 is connected with ground, the sampling end of the first control unit U1 is connected with R5 with R4, the first control unit U1 can select the single-chip microcomputer of the arbitrary AD of having sampling module and PWM control output, present embodiment is selected PIC16F684, its operation principle is as follows, cell voltage is through the 4th resistance R 4 and the 5th resistance R 5 dividing potential drops, the first control unit U1 is by this magnitude of voltage of sampling, according to this magnitude of voltage, the PWM ripple control charge switch circuit 101 of the first control unit output different duty is in the state that is full of electricity when the first control unit detects battery, then turn-off a MOS switching tube M1, charge circuit cuts off, and charging circuit stops battery being charged, and then has avoided the generation of battery overcharge situation.The mode that adopts simultaneously pwm pulse to charge can be protected the useful life of battery.
The first capacitor C 1 mainly plays voltage stabilizing; the first diode D1 mainly plays the effect of back flow protection, namely under certain conditions, and when the magnitude of voltage of the load output valve greater than supply voltage; because the unidirectional general character of diode can not cause the backflow of electric current that power supply is burnt out.
By above technical scheme, adopt a kind of simple circuit structure to realize overcurrent protection, improved response speed and the stability of circuit, greatly reduce simultaneously cost.
The above only is preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of within spirit of the present utility model and principle, doing, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (7)
1. battery overcharge protective circuit, it is characterized in that, comprise charge switch circuit and voltage sample and control circuit, described charge switch circuit further comprises the first resistance, the second resistance, the 3rd resistance, the one MOS switching tube and the first triode, described voltage sample and control circuit further comprise the 4th resistance, the 5th resistance and the first control unit, described voltage sample and control circuit are used for the monitoring cell voltage, when the battery charging also less than the time, described voltage sample and control circuit are exported the PWM charging pulse of certain duty ratio and are controlled described charge switch circuit, guarantee that charging circuit charges the battery with the pwm pulse of certain duty ratio; When judging that according to sample voltage value the battery charging has been full of, described voltage sample and control circuit turn-off described charge switch circuit, and charge circuit cuts off, and charging circuit stops battery being charged.
2. battery overcharge protective circuit according to claim 1; it is characterized in that; the first resistance one end of described charge switch circuit is connected with the source class of a MOS switching tube; jointly be connected with the anode of charging circuit; the other end of the first resistance is connected with the collector electrode of the first triode and the grid of a MOS switching tube; the base stage of the first triode is connected with an end of the second resistance and an end of the 3rd resistance; the other end of the second resistance is connected with a pin of the first control unit; the other end of the 3rd resistance is connected with the emitting stage of the first triode; and jointly be connected with ground, the drain electrode of a MOS switching tube is connected with the anode of battery through the first diode.
3. battery overcharge protective circuit according to claim 2 is characterized in that, described triode is selected NPN type triode.
4. battery overcharge protective circuit according to claim 2 is characterized in that, described MOS switching tube is selected P type MOS switching tube.
5. battery overcharge protective circuit according to claim 1; it is characterized in that; one end of the 4th resistance is connected with the battery anode; the other end of the 4th resistance is connected with an end of the 5th resistance; the other end of the 5th resistance is connected with ground, and the sampling end of the first control unit is connected with the 5th resistance with the 4th resistance.
6. battery overcharge protective circuit according to claim 5 is characterized in that, described the first control unit is the single-chip microcomputer with AD sampling module.
7. battery overcharge protective circuit according to claim 5 is characterized in that, described the first control unit is the single-chip microcomputer with PWM control output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220190367 CN202663092U (en) | 2012-04-25 | 2012-04-25 | Circuit protecting battery against overcharge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220190367 CN202663092U (en) | 2012-04-25 | 2012-04-25 | Circuit protecting battery against overcharge |
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| CN202663092U true CN202663092U (en) | 2013-01-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220190367 Expired - Fee Related CN202663092U (en) | 2012-04-25 | 2012-04-25 | Circuit protecting battery against overcharge |
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| CN (1) | CN202663092U (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103501031A (en) * | 2013-10-09 | 2014-01-08 | 山东康威通信技术股份有限公司 | Super capacitor charging control circuit |
| CN103606900A (en) * | 2013-10-22 | 2014-02-26 | 徐州市恒源电器有限公司 | Lithium battery charging protection circuit |
| CN104466916A (en) * | 2013-09-12 | 2015-03-25 | 深圳市海洋王照明工程有限公司 | Overcharge protection circuit |
| WO2018036334A1 (en) * | 2016-08-22 | 2018-03-01 | 深圳拓邦股份有限公司 | Battery charging protection latch circuit and double-protection circuit |
| CN110071552A (en) * | 2019-05-30 | 2019-07-30 | 温州大学 | A kind of battery charging management circuit |
| CN110148988A (en) * | 2019-06-04 | 2019-08-20 | 深圳和而泰智能控制股份有限公司 | A kind of over-charging of battery protection circuit |
| CN110752642A (en) * | 2019-11-12 | 2020-02-04 | Oppo广东移动通信有限公司 | Protection circuit of battery and electronic equipment |
| CN110994745A (en) * | 2019-12-27 | 2020-04-10 | 江苏艾伦摩尔微电子科技有限公司 | Pulse method wireless charging circuit |
| CN111082496A (en) * | 2020-01-08 | 2020-04-28 | 深圳市聚力得电子有限公司 | Linear adjustable power converter based on PD (proportion integration) protocol and charging method |
-
2012
- 2012-04-25 CN CN 201220190367 patent/CN202663092U/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104466916A (en) * | 2013-09-12 | 2015-03-25 | 深圳市海洋王照明工程有限公司 | Overcharge protection circuit |
| CN104466916B (en) * | 2013-09-12 | 2019-04-16 | 深圳市海洋王照明工程有限公司 | A kind of additives for overcharge protection circuit |
| CN103501031A (en) * | 2013-10-09 | 2014-01-08 | 山东康威通信技术股份有限公司 | Super capacitor charging control circuit |
| CN103501031B (en) * | 2013-10-09 | 2016-01-27 | 山东康威通信技术股份有限公司 | A kind of super capacitor charging control circuit |
| CN103606900A (en) * | 2013-10-22 | 2014-02-26 | 徐州市恒源电器有限公司 | Lithium battery charging protection circuit |
| WO2018036334A1 (en) * | 2016-08-22 | 2018-03-01 | 深圳拓邦股份有限公司 | Battery charging protection latch circuit and double-protection circuit |
| CN110071552A (en) * | 2019-05-30 | 2019-07-30 | 温州大学 | A kind of battery charging management circuit |
| CN110071552B (en) * | 2019-05-30 | 2021-05-04 | 温州大学 | Battery charging management circuit |
| CN110148988A (en) * | 2019-06-04 | 2019-08-20 | 深圳和而泰智能控制股份有限公司 | A kind of over-charging of battery protection circuit |
| CN110148988B (en) * | 2019-06-04 | 2023-06-16 | 深圳和而泰智能控制股份有限公司 | Battery overcharge protection circuit |
| CN110752642A (en) * | 2019-11-12 | 2020-02-04 | Oppo广东移动通信有限公司 | Protection circuit of battery and electronic equipment |
| CN110752642B (en) * | 2019-11-12 | 2023-10-20 | Oppo广东移动通信有限公司 | Battery protection circuit and electronic equipment |
| CN110994745A (en) * | 2019-12-27 | 2020-04-10 | 江苏艾伦摩尔微电子科技有限公司 | Pulse method wireless charging circuit |
| CN111082496A (en) * | 2020-01-08 | 2020-04-28 | 深圳市聚力得电子有限公司 | Linear adjustable power converter based on PD (proportion integration) protocol and charging method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130109 Termination date: 20140425 |