CN104426138A - Over-discharge protection circuit of chargeable battery - Google Patents
Over-discharge protection circuit of chargeable battery Download PDFInfo
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- CN104426138A CN104426138A CN201310364644.4A CN201310364644A CN104426138A CN 104426138 A CN104426138 A CN 104426138A CN 201310364644 A CN201310364644 A CN 201310364644A CN 104426138 A CN104426138 A CN 104426138A
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Abstract
Disclosed is an over-discharge protection circuit of a chargeable battery. The over-discharge protection circuit detects the output voltage of the chargeable battery through a voltage detection module, and when the output voltage of the chargeable battery is larger than or equal to a discharge threshold, the output voltage of the voltage detection module is larger than a reference voltage of a voltage comparison module, and the voltage comparison module outputs a high level so as to enable a switch control module to switch on. Therefore, the chargeable battery can supply power to a load through an on-off control module. When the output voltage of the chargeable battery is smaller than a discharge threshold, the output voltage of the voltage detection module is smaller than a pole voltage of the voltage comparison module, and the voltage comparison module outputs a low level so as to enable the on-off control module to stop. Therefore, the chargeable battery stops supplying power to the load. Therefore, through the voltage detection module, the voltage comparison module and the on-off control module, over-discharge protection of the chargeable battery is realized and causing of damages on the chargeable battery by over-discharge is prevented.
Description
Technical field
The present invention relates to over-discharge protection circuit, particularly relate to a kind of over-discharge protection circuit that is simple, rechargeable battery reliably.
Background technology
Battery discharges the electricity of internal reservoir, and after voltage reaches certain value, continuing electric discharge will cause overdischarge, usually determines discharge cut-off voltage according to discharging current.Battery is crossed to put to cross to the consequence of bringing on a disaster property of battery, particularly big current and is put, or battery impact of being repeatedly excessively rivals in a contest is larger.Generally speaking, overdischarge can make inner pressure of battery raise, and both positive and negative polarity active material invertibity is damaged, even if charging also can only partly recover, capacity also has obvious decay, and the useful life of battery is shortened.
Summary of the invention
Based on this, be necessary to provide a kind of over-discharge protection circuit of the simple and reliable rechargeable battery preventing from battery from crossing putting.
An over-discharge protection circuit for rechargeable battery, when putting for crossing at rechargeable battery, cut-off rechargeable battery discharges to external equipment, comprises voltage detection module, voltage comparison module and switch control module;
The positive pole of rechargeable battery described in the input termination of described voltage detection module, the input of voltage comparison module described in the output termination of described voltage detection module, the control end of switch control module described in the output termination of described voltage comparison module, the positive pole of rechargeable battery described in the input termination of described switch control module, the output terminating load of described switch control module, the earth terminal of described voltage detection module, the earth terminal of described voltage comparison module all connect the negative pole of described rechargeable battery;
When described voltage detection module detects that the output voltage of described rechargeable battery is more than or equal to discharge threshold, the output voltage of described voltage detection module is greater than the reference voltage of described voltage comparison module, described voltage comparison module exports high level, conducting when described switch control module receives high level, described rechargeable battery is to load supplying;
When described voltage detection module detects that the output voltage of described rechargeable battery is less than discharge threshold, the output voltage of described voltage detection module is less than the reference voltage of described voltage comparison module, described voltage comparison module output low level, described switch control module ends when receiving low level, and described rechargeable battery stops load discharge.
Wherein in an embodiment, described voltage detection module comprises voltage stabilizing didoe VD1 and divider resistance R1;
Described voltage stabilizing didoe VD1 and described divider resistance R1 is parallel to the positive and negative end of described rechargeable battery after connecting, wherein, the negative pole of described voltage stabilizing didoe VD1 is connected with the positive pole of described rechargeable battery, and one end of described divider resistance R1 is connected with the negative pole of described rechargeable battery.
Wherein in an embodiment, the conducting voltage of described voltage stabilizing didoe VD1 is 3V.
Wherein in an embodiment, the resistance of described divider resistance R1 is 3M Ω.
Wherein in an embodiment, described voltage comparison module comprises field effect transistor V2,
The grid of described field effect transistor V2, source electrode and drain electrode correspond to the input of described voltage comparison module, earth terminal and output.
Wherein in an embodiment, the model of described field effect transistor V2 is N raceway groove 2N7002.
Wherein in an embodiment, described switch control module comprises divider resistance R2 and field effect transistor V1;
Described divider resistance R2 is parallel to source electrode and the grid two ends of described field effect transistor V1, the source electrode of described field effect transistor V1 and the points of common connection of described divider resistance R2 are the input of described switch control module, the grid of described field effect transistor V1 and the points of common connection of described divider resistance R2 are the control end of described switch control module, and the drain electrode of described field effect transistor V1 is the output of described switch control module.
Wherein in an embodiment, the resistance of described divider resistance R2 is 2M Ω.
Wherein in an embodiment, the model of described field effect transistor V1 is P raceway groove AO4407.
The over-discharge protection circuit of above-mentioned rechargeable battery detects the output voltage of rechargeable battery by voltage detection module; when the output voltage of rechargeable battery is more than or equal to discharge threshold; the output voltage of voltage detection module is greater than the reference voltage of voltage comparison module; voltage comparison module exports high level and makes switch control module conducting, and thus rechargeable battery is powered to the load by switch control module.When the output voltage of rechargeable battery is less than discharge threshold; the output voltage of voltage detection module is less than the pole voltage of voltage comparison module; voltage comparison module output low level makes switch control module end; thus rechargeable battery stops load supplying; thus voltage detection module, voltage comparison module and switch control module can be passed through realize Cross prevention to rechargeable battery, rechargeable battery of avoiding being rivals in a contest causes damage.
Accompanying drawing explanation
Fig. 1 is the module map of the over-discharge protection circuit of rechargeable battery;
Fig. 2 is the schematic diagram of the over-discharge protection circuit of rechargeable battery.
Embodiment
As shown in Figure 1, be the module map of the over-discharge protection circuit of rechargeable battery.
An over-discharge protection circuit for rechargeable battery, when putting for crossing at rechargeable battery, cut-off rechargeable battery discharges to external equipment, comprises voltage detection module 101, voltage comparison module 103 and switch control module 105.
The positive pole of rechargeable battery described in the input termination of described voltage detection module 101, the input of voltage comparison module 103 described in the output termination of described voltage detection module 101, the control end of switch control module 105 described in the output termination of described voltage comparison module 103, the positive pole of rechargeable battery described in the input termination of described switch control module 105, the output terminating load of described switch control module 105, the earth terminal of described voltage detection module 101, the earth terminal of described voltage comparison module 103 all connect the negative pole of described rechargeable battery.
When described voltage detection module 101 detects that the output voltage of described rechargeable battery is more than or equal to discharge threshold, the output voltage of described voltage detection module 101 is greater than the reference voltage of described voltage comparison module 103, described voltage comparison module 103 exports high level, conducting when described switch control module 105 receives high level, described rechargeable battery is to load supplying.
When described voltage detection module 101 detects that the output voltage of described rechargeable battery is less than discharge threshold, the output voltage of described voltage detection module 101 is less than the reference voltage of described voltage comparison module 103, described voltage comparison module 103 output low level, described switch control module 105 ends when receiving low level, and described rechargeable battery stops load discharge.
Voltage detection module 101 for detecting cell voltage, and converts the cell voltage detected to output voltage and exports to voltage comparison module 103.Particularly, when rechargeable battery is crossed and put, when namely the output voltage of rechargeable battery is less than discharge threshold, the output voltage of voltage detection module 101 is less than reference voltage; When rechargeable battery is normal, when namely the output voltage of rechargeable battery is more than or equal to discharge threshold, the output voltage of voltage detection module 101 is greater than reference voltage.
Voltage comparison module 103 for the magnitude relationship between the output voltage of comparative voltage detection module 101 and reference voltage, and exports comparative result.Particularly, when battery is crossed and put, the output voltage of voltage detection module 101 is less than reference voltage, voltage comparison module 101 output low level; When battery is normal, the output voltage of voltage detection module 101 is greater than reference voltage, and voltage comparison module 103 exports high level.
Switch control module 105 for output switching signal, thus controls the connection status of rechargeable battery and load.When voltage comparison module 103 exports high level, switch control module 105 conducting, after switch control module 105, rechargeable battery is connected with load, rechargeable battery is to load supplying.When voltage comparison module 103 output low level, switch control module 105 ends, and after switch control module 105 ends, disconnects the connection of rechargeable battery and load, and rechargeable battery stopping to load supplying, thus is avoided battery to cross putting.
Incorporated by reference to Fig. 2.
Voltage detection module comprises voltage stabilizing didoe VD1 and divider resistance R1.
Described voltage stabilizing didoe VD1 and described divider resistance R1 is parallel to the positive and negative end of described rechargeable battery after connecting, wherein, the negative pole of described voltage stabilizing didoe VD1 is connected with the positive pole of described rechargeable battery, and one end of described divider resistance R1 is connected with the negative pole of described rechargeable battery.
The conducting voltage of voltage stabilizing didoe VD1 is 3V.
The resistance of divider resistance R1 is 3M Ω.
Voltage comparison module comprises field effect transistor V2.
The grid of described field effect transistor V2, source electrode and drain electrode correspond to the input of described voltage comparison module, earth terminal and output.
The model of field effect transistor V2 is N raceway groove 2N7002.
Switch control module comprises divider resistance R2 and field effect transistor V1.
Described divider resistance R2 is parallel to source electrode and the grid two ends of described field effect transistor V1, the source electrode of described field effect transistor V1 and the points of common connection of described divider resistance R2 are the input of described switch control module, the grid of described field effect transistor V1 and the points of common connection of described divider resistance R2 are the control end of described switch control module, and the drain electrode of described field effect transistor V1 is the output of described switch control module.
The resistance of divider resistance R2 is 2M Ω.
The model of field effect transistor V1 is P raceway groove AO4407.
In yet another embodiment, field effect transistor V2 and field effect transistor V1 can adopt triode to substitute.Concrete, field effect transistor V2 adopts N-type triode Q2 to substitute, and field effect transistor V1 adopts P type triode Q1 to substitute.Therefore, when voltage stabilizing didoe VD1 conducting, the base stage of triode Q2 is high level, triode Q2 conducting, the collector electrode output low level of triode Q2, to the base stage of triode Q1, drags down the base voltage of triode Q1, triode Q1 conducting, rechargeable battery is to load supplying.When voltage stabilizing didoe VD1 ends, the base stage of triode Q2 is low level, and triode Q2 ends.Therefore the base stage of triode Q1 directly connects rechargeable battery by divider resistance R2, and thus, triode Q1 ends.
Based on above-mentioned all embodiments, the saturation voltage of rechargeable battery is 6V.
Based on above-mentioned all embodiments, the operation principle of the over-discharge protection circuit of rechargeable battery is as follows:
Rechargeable battery is to load supplying, when the output voltage of rechargeable battery is more than or equal to discharge threshold, what the voltage that voltage stabilizing didoe VD1 gets after connecting with divider resistance R1 can reach voltage stabilizing didoe VD1 punctures conducting voltage, the thus breakdown reverse-conducting of voltage stabilizing didoe VD1.The voltage now divider resistance R1 got is the output voltage of voltage detection module 101, the voltage that divider resistance R1 divides, higher than the threshold voltage of field effect transistor V2, is namely greater than the reference voltage of voltage comparison module 103, therefore, field effect transistor V2 conducting, field effect transistor V2 exports high level.With field effect transistor V2 drain the field effect transistor V1 that is connected receive high level time conducting, therefore, rechargeable battery is powered to the load by field effect transistor V1.
When the output voltage of rechargeable battery is less than discharge threshold, the undertension that voltage stabilizing didoe VD1 gets after connecting with divider resistance R1 punctures conducting to make voltage stabilizing didoe VD1, and thus voltage stabilizing didoe VD1 ends.The voltage now divider resistance R1 got is the output voltage of voltage detection module 101, the voltage that divider resistance R1 divides, lower than the threshold voltage of field effect transistor V2, is namely less than the reference voltage of voltage comparison module 103, therefore, field effect transistor V2 ends, field effect transistor V2 output low level.Drain when the field effect transistor V1 that is connected receives low level with field effect transistor V2 and end, therefore, rechargeable battery stops load supplying.
The over-discharge protection circuit of above-mentioned rechargeable battery detects the output voltage of rechargeable battery by voltage detection module 101; when the output voltage of rechargeable battery is more than or equal to discharge threshold; the output voltage of voltage detection module 101 is greater than the reference voltage of voltage comparison module 103; voltage comparison module 103 exports high level and makes switch control module 105 conducting, and thus rechargeable battery is powered to the load by switch control module 105.When the output voltage of rechargeable battery is less than discharge threshold; the output voltage of voltage detection module 101 is less than the pole voltage of voltage comparison module 103; voltage comparison module 103 output low level makes switch control module 105 end; thus rechargeable battery stops load supplying; thus the Cross prevention that can realize rechargeable battery by voltage detection module 101, voltage comparison module 103 and switch control module 105, rechargeable battery of avoiding being rivals in a contest causes damage.
The above embodiment only have expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (9)
1. an over-discharge protection circuit for rechargeable battery, when putting for crossing at rechargeable battery, cut-off rechargeable battery discharges to external equipment, it is characterized in that, comprises voltage detection module, voltage comparison module and switch control module;
The positive pole of rechargeable battery described in the input termination of described voltage detection module, the input of voltage comparison module described in the output termination of described voltage detection module, the control end of switch control module described in the output termination of described voltage comparison module, the positive pole of rechargeable battery described in the input termination of described switch control module, the output terminating load of described switch control module, the earth terminal of described voltage detection module, the earth terminal of described voltage comparison module all connect the negative pole of described rechargeable battery;
When described voltage detection module detects that the output voltage of described rechargeable battery is more than or equal to discharge threshold, the output voltage of described voltage detection module is greater than the reference voltage of described voltage comparison module, described voltage comparison module exports high level, conducting when described switch control module receives high level, described rechargeable battery is to load supplying;
When described voltage detection module detects that the output voltage of described rechargeable battery is less than discharge threshold, the output voltage of described voltage detection module is less than the reference voltage of described voltage comparison module, described voltage comparison module output low level, described switch control module ends when receiving low level, and described rechargeable battery stops load discharge.
2. the over-discharge protection circuit of rechargeable battery according to claim 1, is characterized in that, described voltage detection module comprises voltage stabilizing didoe VD1 and divider resistance R1;
Described voltage stabilizing didoe VD1 and described divider resistance R1 is parallel to the positive and negative end of described rechargeable battery after connecting, wherein, the negative pole of described voltage stabilizing didoe VD1 is connected with the positive pole of described rechargeable battery, and one end of described divider resistance R1 is connected with the negative pole of described rechargeable battery.
3. the over-discharge protection circuit of rechargeable battery according to claim 2, is characterized in that, the conducting voltage of described voltage stabilizing didoe VD1 is 3V.
4. the over-discharge protection circuit of rechargeable battery according to claim 2, is characterized in that, the resistance of described divider resistance R1 is 3M Ω.
5. the over-discharge protection circuit of rechargeable battery according to claim 1, is characterized in that, described voltage comparison module comprises field effect transistor V2,
The grid of described field effect transistor V2, source electrode and drain electrode correspond to the input of described voltage comparison module, earth terminal and output.
6. the over-discharge protection circuit of rechargeable battery according to claim 5, is characterized in that, the model of described field effect transistor V2 is N raceway groove 2N7002.
7. the over-discharge protection circuit of rechargeable battery according to claim 1, is characterized in that, described switch control module comprises divider resistance R2 and field effect transistor V1;
Described divider resistance R2 is parallel to source electrode and the grid two ends of described field effect transistor V1, the source electrode of described field effect transistor V1 and the points of common connection of described divider resistance R2 are the input of described switch control module, the grid of described field effect transistor V1 and the points of common connection of described divider resistance R2 are the control end of described switch control module, and the drain electrode of described field effect transistor V1 is the output of described switch control module.
8. the over-discharge protection circuit of rechargeable battery according to claim 7, is characterized in that, the resistance of described divider resistance R2 is 2M Ω.
9. the over-discharge protection circuit of rechargeable battery according to claim 7, is characterized in that, the model of described field effect transistor V1 is P raceway groove AO4407.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310364644.4A CN104426138A (en) | 2013-08-20 | 2013-08-20 | Over-discharge protection circuit of chargeable battery |
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| CN201310364644.4A CN104426138A (en) | 2013-08-20 | 2013-08-20 | Over-discharge protection circuit of chargeable battery |
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| CN201310364644.4A Pending CN104426138A (en) | 2013-08-20 | 2013-08-20 | Over-discharge protection circuit of chargeable battery |
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| CN107346901A (en) * | 2016-05-05 | 2017-11-14 | 卢昭正 | Cell discharge protective device |
| CN107394770A (en) * | 2017-08-29 | 2017-11-24 | 广州周立功单片机科技有限公司 | Power supply modulate circuit |
| CN107425593A (en) * | 2017-08-09 | 2017-12-01 | 辽宁省肿瘤医院 | Multivoltage battery parallel circuit |
| CN107544374A (en) * | 2017-06-05 | 2018-01-05 | 苏州天信德环保科技有限公司 | A kind of basic model total quantity monitoring instrument |
| CN109075602A (en) * | 2016-09-06 | 2018-12-21 | 株式会社自动网络技术研究所 | Vehicle-mounted stand-by provision |
| CN109789841A (en) * | 2016-10-07 | 2019-05-21 | 株式会社自动网络技术研究所 | Mobile unit |
| CN114030388A (en) * | 2021-10-27 | 2022-02-11 | 智新控制系统有限公司 | Overcurrent protection system and method |
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Application publication date: 20150318 |