CN204205574U - A kind of over-discharge protection circuit - Google Patents
A kind of over-discharge protection circuit Download PDFInfo
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- CN204205574U CN204205574U CN201420776542.3U CN201420776542U CN204205574U CN 204205574 U CN204205574 U CN 204205574U CN 201420776542 U CN201420776542 U CN 201420776542U CN 204205574 U CN204205574 U CN 204205574U
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model provides a kind of over-discharge protection circuit, comprises metal-oxide-semiconductor Q1, integrated circuit TL431, resistance R1-R5, electric capacity EC1, EC2; One end of R1 is connected with the drain electrode of battery VBAT with Q1, and R2 one end is connected with Q1 grid, and the tie point between R2 and Q1 grid is connected with the other end of R1, and the other end of R2 is connected with TL431 negative electrode, TL431 plus earth; Q1 source electrode is connected with R3 one end, and the R3 other end is connected with one end of R4, the other end ground connection of R4; Tie point between R3 and R4 and TL431 are with reference to being extremely connected, and this tie point is also connected with one end of R5, and the other end of R5 is connected with VBAT; Q1 source electrode is also connected with EC2 anode, EC2 minus earth, and the tie point between Q1 source electrode and EC2 anode is as the output of whole circuit; EC1 anode is connected with VBAT, EC1 minus earth.
Description
Technical field
The utility model relates to Switching Power Supply and controller technology field, more specifically, relates to a kind of over-discharge protection circuit.
Background technology
Along with social development, electronic product constantly updates, and battery has played very large effect in electronic product.Such as existing DC fan, hand-held controller arranges instrument, and all multi-products such as controller for solar all relate to the utilization of rechargeable battery, but this series products battery cross put after be present in certain shortcoming:
1, quiescent dissipation is large;
2, charging not in time, battery is fragile;
3, the complicated cost of protective circuit is high.
Utility model content
The utility model provides a kind of simple and reliable, low-power consumption, the over-discharge protection circuit easily realized.
In order to reach above-mentioned technical purpose, the technical solution of the utility model is as follows:
A kind of over-discharge protection circuit, comprises metal-oxide-semiconductor Q1, integrated circuit TL431, resistance R1-R5, electric capacity EC1, EC2; One end of resistance R1 is connected with the drain electrode of metal-oxide-semiconductor Q1 with battery VBAT, one end of resistance R2 is connected with the grid of metal-oxide-semiconductor Q1, tie point between resistance R2 and the grid of metal-oxide-semiconductor Q1 is connected with the other end of resistance R1, the other end of resistance R2 is connected with the negative electrode of integrated circuit TL431, the plus earth of integrated circuit TL431; The source electrode of metal-oxide-semiconductor Q1 is connected with one end of resistance R3, and the other end of resistance R3 is connected with one end of resistance R4, the other end ground connection of resistance R4; Tie point between resistance R3 and resistance R4 is extremely connected with the reference of integrated circuit TL431, and this tie point is also connected with one end of resistance R5, and the other end of resistance R5 is connected with battery VBAT; The source electrode of metal-oxide-semiconductor Q1 is also connected with the anode of electric capacity EC2, the minus earth of electric capacity EC2, and the tie point between the source electrode of metal-oxide-semiconductor Q1 and the anode of electric capacity EC2 is as the output of whole over-discharge protection circuit; The anode of electric capacity EC1 is connected with battery VBAT, the minus earth of electric capacity EC1.
Preferably, described metal-oxide-semiconductor Q1 is P type metal-oxide-semiconductor.
Preferably, described integrated circuit TL431 is the TL431 being used as comparator.
In the utility model, metal-oxide-semiconductor Q1 is P type metal-oxide-semiconductor, when metal-oxide-semiconductor Q1 conducting after conducting after its grid voltage is lower than drain voltage certain value, when battery VBAT voltage is normal, the reference pole input voltage of TL431 is greater than the reference voltage of integrated circuit TL431, conducting between integrated circuit TL431 anode and negative electrode, now metal-oxide-semiconductor Q1 conducting is load supplying.When cell voltage is lower than set point, the reference pole input voltage of TL431 is less than the reference voltage of integrated circuit TL431, end between integrated circuit TL431 anode and negative electrode, metal-oxide-semiconductor Q1 turns off, circuit is supplying power for outside not, now whole circuit only has integrated circuit TL431 to there is power consumption, and the power on R4 and R5 is very little can be ignored, the power consumption of the resistance suitably adjusting R1, R2 just adjustable integrated circuit TL431.
Compared with prior art, the beneficial effect of technical solutions of the utility model is:
The combination that the utility model adopts integrated circuit TL431 to substitute complicated circuit element as the core devices of Cross prevention realizes Cross prevention function, makes circuit structure simply, also reduces the power consumption of whole circuit simultaneously.
Accompanying drawing explanation
Fig. 1 is schematic diagram of the present utility model.
Embodiment
Accompanying drawing, only for exemplary illustration, can not be interpreted as the restriction to this patent;
In order to better the present embodiment is described, some parts of accompanying drawing have omission, zoom in or out, and do not represent the size of actual product;
To those skilled in the art, in accompanying drawing, some known features and explanation thereof may be omitted is understandable.
Below in conjunction with drawings and Examples, the technical solution of the utility model is described further.
Embodiment 1
As shown in Figure 1, a kind of over-discharge protection circuit, comprises metal-oxide-semiconductor Q1, integrated circuit TL431, resistance R1-R5, electric capacity EC1, EC2; One end of resistance R1 is connected with the drain electrode of metal-oxide-semiconductor Q1 with battery VBAT, one end of resistance R2 is connected with the grid of metal-oxide-semiconductor Q1, tie point between resistance R2 and the grid of metal-oxide-semiconductor Q1 is connected with the other end of resistance R1, the other end of resistance R2 is connected with the negative electrode of integrated circuit TL431, the plus earth of integrated circuit TL431; The source electrode of metal-oxide-semiconductor Q1 is connected with one end of resistance R3, and the other end of resistance R3 is connected with one end of resistance R4, the other end ground connection of resistance R4; Tie point between resistance R3 and resistance R4 is extremely connected with the reference of integrated circuit TL431, and this tie point is also connected with one end of resistance R5, and the other end of resistance R5 is connected with battery VBAT; The source electrode of metal-oxide-semiconductor Q1 is also connected with the anode of electric capacity EC2, the minus earth of electric capacity EC2, and the tie point between the source electrode of metal-oxide-semiconductor Q1 and the anode of electric capacity EC2 is as the output of whole over-discharge protection circuit; The anode of electric capacity EC1 is connected with battery VBAT, the minus earth of electric capacity EC1.
In the present embodiment, metal-oxide-semiconductor Q1 is P type metal-oxide-semiconductor; Integrated circuit TL431 is the TL431 being used as comparator.
In the present embodiment, metal-oxide-semiconductor Q1 is P type metal-oxide-semiconductor, when metal-oxide-semiconductor Q1 conducting after conducting after its grid voltage is lower than drain voltage certain value, when battery VBAT voltage is normal, the reference pole input voltage of TL431 is greater than the reference voltage of integrated circuit TL431, conducting between integrated circuit TL431 anode and negative electrode, now metal-oxide-semiconductor Q1 conducting is load supplying.When cell voltage is lower than set point, the reference pole input voltage of TL431 is less than the reference voltage of integrated circuit TL431, end between integrated circuit TL431 anode and negative electrode, metal-oxide-semiconductor Q1 turns off, circuit is supplying power for outside not, now whole circuit only has integrated circuit TL431 to there is power consumption, and the power on R4 and R5 is very little can be ignored, the power consumption of the resistance suitably adjusting R1, R2 just adjustable integrated circuit TL431.
The corresponding same or analogous parts of same or analogous label;
Describe in accompanying drawing position relationship for only for exemplary illustration, the restriction to this patent can not be interpreted as;
Obviously, above-described embodiment of the present utility model is only for the utility model example is clearly described, and is not the restriction to execution mode of the present utility model.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all execution modes.All do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., within the protection range that all should be included in the utility model claim.
Claims (3)
1. an over-discharge protection circuit, is characterized in that, comprises metal-oxide-semiconductor Q1, integrated circuit TL431, resistance R1-R5, electric capacity EC1, EC2; One end of resistance R1 is connected with the drain electrode of metal-oxide-semiconductor Q1 with battery VBAT, one end of resistance R2 is connected with the grid of metal-oxide-semiconductor Q1, tie point between resistance R2 and the grid of metal-oxide-semiconductor Q1 is connected with the other end of resistance R1, the other end of resistance R2 is connected with the negative electrode of integrated circuit TL431, the plus earth of integrated circuit TL431; The source electrode of metal-oxide-semiconductor Q1 is connected with one end of resistance R3, and the other end of resistance R3 is connected with one end of resistance R4, the other end ground connection of resistance R4; Tie point between resistance R3 and resistance R4 is extremely connected with the reference of integrated circuit TL431, and this tie point is also connected with one end of resistance R5, and the other end of resistance R5 is connected with battery VBAT; The source electrode of metal-oxide-semiconductor Q1 is also connected with the anode of electric capacity EC2, the minus earth of electric capacity EC2, and the tie point between the source electrode of metal-oxide-semiconductor Q1 and the anode of electric capacity EC2 is as the output of whole over-discharge protection circuit; The anode of electric capacity EC1 is connected with battery VBAT, the minus earth of electric capacity EC1.
2. over-discharge protection circuit according to claim 1, is characterized in that, described metal-oxide-semiconductor Q1 is P type metal-oxide-semiconductor.
3. over-discharge protection circuit according to claim 1, is characterized in that, described integrated circuit TL431 is the TL431 being used as comparator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420776542.3U CN204205574U (en) | 2014-12-11 | 2014-12-11 | A kind of over-discharge protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420776542.3U CN204205574U (en) | 2014-12-11 | 2014-12-11 | A kind of over-discharge protection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN204205574U true CN204205574U (en) | 2015-03-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420776542.3U Active CN204205574U (en) | 2014-12-11 | 2014-12-11 | A kind of over-discharge protection circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104918360A (en) * | 2015-05-03 | 2015-09-16 | 广东瑞德智能科技股份有限公司 | Comprehensive protection circuit of LED power supply |
| CN106998057A (en) * | 2017-04-25 | 2017-08-01 | 黄浩波 | A kind of LED modules overcurrent protector |
-
2014
- 2014-12-11 CN CN201420776542.3U patent/CN204205574U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104918360A (en) * | 2015-05-03 | 2015-09-16 | 广东瑞德智能科技股份有限公司 | Comprehensive protection circuit of LED power supply |
| CN106998057A (en) * | 2017-04-25 | 2017-08-01 | 黄浩波 | A kind of LED modules overcurrent protector |
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