CN203617696U - Cell over-discharge protection circuit - Google Patents
Cell over-discharge protection circuit Download PDFInfo
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- CN203617696U CN203617696U CN201320879686.7U CN201320879686U CN203617696U CN 203617696 U CN203617696 U CN 203617696U CN 201320879686 U CN201320879686 U CN 201320879686U CN 203617696 U CN203617696 U CN 203617696U
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- oxide
- semiconductor
- protection circuit
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- 239000004065 semiconductor Substances 0.000 claims description 25
- 230000002265 prevention Effects 0.000 claims description 10
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model discloses a simple cell over-discharge protection circuit. The cell over-discharge protection circuit comprises a cell module with an over-charge protection circuit and an over-discharge protection module. The cell module mainly comprises a cell. The over-discharge protection module comprises resistors R1-R4 and MOS tubes Q1-Q2. One end of the resistor R1 is connected with the positive electrode of the cell and the drain electrode of the MOS tube Q1. The other end of the resistor R1 is connected with the grid electrode of the MOS tube Q1. The other end of the resistor R1 is also connected with the negative electrode of the cell, one end of the resistor R4 and the source electrode of the MOS tube Q2 through the resistor R2. The other end of the resistor R4 is connected with the grid electrode of the MOS tube Q2 through the resistor R3. The other end of the resistor R4 is also connected with the grid electrode of the MOS tube Q1. The positive electrode of the cell BTA1 is connected with a power supply VCC. The drain electrode of the MOS tube Q2 is connected with a power supply GND. In the whole circuit, the two outputs of VCC and GND supply power for load, the cell energy is consumed by the load, and the voltage of the cell is lowered to control turn-on and turn-off of the MOS tubes and over-discharge protection is achieved.
Description
Technical field
The utility model relates to power supply Cross prevention technical field, more specifically, relates to a kind of overcharging protection circuit of rechargeable battery.
Background technology
Current, a lot of products for improving the design class of product, increase a lot of additional functions in product design, such as product is under power-down conditions, can normally show, and be the more common additional function of one, so in a lot of products, all with rechargeable battery.
Rechargeable battery, in charge and discharge process, for avoiding battery because super-charge super-discharge damages, in the circuit in design with rechargeable battery, necessarily need to have two protective circuits of additional super-charge super-discharge, guarantees that the battery long-life is used.And existing a lot of rechargeable battery all can carry overcharge protection circuit and do not have over-discharge protection circuit.
Utility model content
The purpose of this utility model is to propose a kind of battery over-discharge protection circuit, and this circuit is applicable to carry overcharge protection circuit and the rechargeable battery that do not have over-discharge protection circuit, and its circuit is simple and practical.
The purpose of this utility model can reach by the following technical programs:
A kind of battery over-discharge protection circuit, comprise the battery module and the Cross prevention module that carry overcharge protection circuit, the battery module that wherein carries overcharge protection circuit mainly comprises battery BTA1, described Cross prevention module comprises resistance R 1 ~ R4 and metal-oxide-semiconductor Q1 ~ Q2, resistance R 1 one end connects respectively the drain electrode of positive pole and the metal-oxide-semiconductor Q1 of battery BTA1, resistance R 1 another termination metal-oxide-semiconductor Q1 grid, resistance R 1 other end also connects respectively the negative pole of battery BTA1 by resistance R 2, the source electrode of one end of resistance R 4 and metal-oxide-semiconductor Q2, the other end of resistance R 4 connects the grid of metal-oxide-semiconductor Q2 by resistance R 3, the other end of resistance R 4 also connects the grid of metal-oxide-semiconductor Q1,
The positive pole of above-mentioned battery BTA1 connects power supply VCC end, and the drain electrode of metal-oxide-semiconductor Q2 connects power supply GND end.
Described metal-oxide-semiconductor Q1～Q2 is N channel enhancement MOSFET pipe.
Described battery BTA1 is rechargeable battery.
Described resistance R 1 ~ R4 is that the resistance order of magnitude is mega-ohms, guarantees to consume electric energy little.
The beneficial effect the utlity model has: circuit of the present utility model is simple, only needs to adopt 4 resistance and 2 metal-oxide-semiconductors can realize battery Cross prevention, guarantees battery, practical.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model.
Wherein, 1-carries battery module, 2-Cross prevention module, the BAT1-battery of overcharge protection circuit, Q1, Q2-N channel enhancement MOSFET pipe, R1 ~ R4 resistance.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described, but execution mode of the present utility model is not limited to this.
With reference to Fig. 1, a kind of battery over-discharge protection circuit, comprise the battery module 1 that carries overcharge protection circuit, mainly comprise battery BTA1, also comprise Cross prevention module 2, Cross prevention module 2 comprises resistance R 1 ~ R4 and metal-oxide-semiconductor Q1 ~ Q2, resistance R 1 one end connects respectively the drain electrode of positive pole and the metal-oxide-semiconductor Q1 of battery BTA1, resistance R 1 another termination metal-oxide-semiconductor Q1 grid, resistance R 1 other end also connects respectively the negative pole of battery BTA1 by resistance R 2, the source electrode of one end of resistance R 4 and metal-oxide-semiconductor Q2, the other end of resistance R 4 connects the grid of metal-oxide-semiconductor Q2 by resistance R 3, the other end of resistance R 4 also connects the grid of metal-oxide-semiconductor Q1,
The positive pole of above-mentioned battery BTA1 connects power supply VCC end, and the drain electrode of metal-oxide-semiconductor Q2 connects power supply GND end.
Whole circuit is load supplying by VCC and two outputs of GND, and the load consumption energy content of battery drags down cell voltage control metal-oxide-semiconductor and turn-offs, and finally realizes Cross prevention.
As Fig. 1, battery over-discharge protection circuit operation principle is described below:
Resistance R 1, R2 dividing potential drop, cause MOSFET pipe Q1 conducting, and MOSFET pipe Q1 conducting is operated in magnifying state, VCC is through MOSFET pipe Q1 internal resistance and resistance R 4 dividing potential drops, form the pressure reduction of MOSFET pipe Q2 grid to MOSFET pipe Q2 source electrode, MOSFET pipe Q2 conducting, finally makes VCC and GND form loop.
In the time discharging into certain degree, resistance R 1, R2 dividing potential drop can not make MOSFET pipe Q1 conducting, and VCC and GND loop are turned off, and battery discharge is cut off.In the time of this circuit of design, all resistance orders of magnitude should be megaohm, guarantee to consume electric energy little.
The above; it is only preferably specific embodiment of the utility model; but protection range of the present utility model is not limited to this; any be familiar with those skilled in the art the utility model disclose scope in; be equal to replacement or changed according to the technical solution of the utility model and utility model design thereof, all being belonged to protection range of the present utility model.
Claims (4)
1. a battery over-discharge protection circuit, comprise the battery module (1) that carries overcharge protection circuit, mainly comprise battery BTA1, it is characterized in that, also comprise Cross prevention module (2), described Cross prevention module (2) comprises resistance R 1 ~ R4 and metal-oxide-semiconductor Q1 ~ Q2, resistance R 1 one end connects respectively the drain electrode of positive pole and the metal-oxide-semiconductor Q1 of battery BTA1, resistance R 1 another termination metal-oxide-semiconductor Q1 grid, resistance R 1 other end also connects respectively the negative pole of battery BTA1 by resistance R 2, the source electrode of one end of resistance R 4 and metal-oxide-semiconductor Q2, the other end of resistance R 4 connects the grid of metal-oxide-semiconductor Q2 by resistance R 3, the other end of resistance R 4 also connects the grid of metal-oxide-semiconductor Q1,
The positive pole of above-mentioned battery BTA1 connects power supply VCC end, and the drain electrode of metal-oxide-semiconductor Q2 connects power supply GND end.
2. battery over-discharge protection circuit according to claim 1, is characterized in that, described metal-oxide-semiconductor Q1～Q2 is N channel enhancement MOSFET pipe.
3. battery over-discharge protection circuit according to claim 1, is characterized in that, described battery BTA1 is rechargeable battery.
4. battery over-discharge protection circuit according to claim 1, is characterized in that, described resistance R 1 ~ R4 is that the resistance order of magnitude is mega-ohms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320879686.7U CN203617696U (en) | 2013-12-30 | 2013-12-30 | Cell over-discharge protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320879686.7U CN203617696U (en) | 2013-12-30 | 2013-12-30 | Cell over-discharge protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203617696U true CN203617696U (en) | 2014-05-28 |
Family
ID=50770319
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320879686.7U Expired - Lifetime CN203617696U (en) | 2013-12-30 | 2013-12-30 | Cell over-discharge protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203617696U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111864867A (en) * | 2020-09-22 | 2020-10-30 | 深圳英集芯科技有限公司 | Battery protection control circuit, chip and electronic device |
-
2013
- 2013-12-30 CN CN201320879686.7U patent/CN203617696U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111864867A (en) * | 2020-09-22 | 2020-10-30 | 深圳英集芯科技有限公司 | Battery protection control circuit, chip and electronic device |
| CN111864867B (en) * | 2020-09-22 | 2021-01-15 | 深圳英集芯科技有限公司 | Battery protection control circuit, chip and electronic device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140528 |
|
| CX01 | Expiry of patent term |