CN203722213U - Lithium battery protection circuit - Google Patents
Lithium battery protection circuit Download PDFInfo
- Publication number
- CN203722213U CN203722213U CN201420034437.2U CN201420034437U CN203722213U CN 203722213 U CN203722213 U CN 203722213U CN 201420034437 U CN201420034437 U CN 201420034437U CN 203722213 U CN203722213 U CN 203722213U
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- CN
- China
- Prior art keywords
- mos transistor
- lithium battery
- lithium ion
- protection chip
- pin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model discloses a lithium battery protection circuit, which comprises a charging end P+, a charging end P-, a diode D1, a lithium ion protection chip, an MOS transistor Q1 and an MOS transistor Q2, wherein the charging end P+ is connected with the positive electrode of the lithium battery; the VDD pin of the lithium ion protection chip is connected with the negative electrode of the lithium battery via a capacitor C1; the DOUT pin of the lithium ion protection chip is connected with the grid electrode of the MOS transistor Q1; the drain electrode of the MOS transistor Q1 is connected with the negative electrode of the lithium battery; the source electrode of the MOS transistor Q1 is connected with the drain electrode of the MOS transistor Q2; the grid electrode of the MOS transistor Q2 is connected with the COUT pin of the lithium ion protection chip; the source electrode of the MOS transistor Q2 is connected with the charging end P-; the V- pin of the lithium ion protection chip is connected with the charging end P- via a resistor R2; the V- of the lithium ion protection chip is connected with the positive electrode of the diode D1; and the negative electrode of the diode D1 is connected with the charging end P+. According to the lithium battery protection circuit, the chip can be prevented from being burnt when reverse charging or discharging is carried out on the lithium battery.
Description
Technical field:
The utility model relates to a kind of protective circuit, especially a kind of lithium battery protection circuit.
Background technology:
For preventing that lithium battery from overcharging in charging process or crossing and put in discharge process, and the problem such as the battery operated inefficiency causing when short circuit, need to add a protective circuit to lithium battery.The guard method that present lithium battery is conventional is to connect DW01 chip at two pins of lithium battery, can effectively be controlled over-charge of lithium battery or be crossed put by DW01 chip.When lithium battery in the time charging and external power source connect instead, easily cause that DW01 chip burns out.
Summary of the invention:
The purpose of this utility model is to solve prior art deficiency, and a kind of lithium battery protection circuit is provided.
The technical solution of the utility model:
A kind of lithium battery protection circuit, comprises charging end P+, charging end P-, diode D1, lithium ion protection chip, MOS transistor Q1 and MOS transistor Q2, the V of lithium ion protection chip
dDpin is connected with the positive pole of lithium battery by resistance R 1, and charging end P+ is connected with the positive pole of lithium battery, the V of lithium ion protection chip
dDpin is connected with the negative pole of lithium battery by capacitor C 1, the D of lithium ion protection chip
oUTpin is connected with the grid of MOS transistor Q1, and the drain electrode of MOS transistor Q1 is connected with the negative pole of lithium battery, and the source electrode of MOS transistor Q1 is connected with the drain electrode of MOS transistor Q2, the C of the grid of MOS transistor Q2 and lithium ion protection chip
oUTpin is connected, and the source electrode of MOS transistor Q2 is connected with charging end P-, the V of lithium ion protection chip
-pin is connected with charging end P-by resistance R 2, the V of lithium ion protection chip
-be connected with the positive pole of diode D1, the negative pole of diode D1 is connected with charging end P+.
Wherein, the C of lithium ion protection chip
oUTbetween the grid of pin and MOS transistor Q2, be provided with diode D2, and the C of lithium ion protection chip
oUTpin is connected with the positive pole of diode D2, and the grid of MOS transistor Q2 is connected with the negative pole of diode D2.
Wherein, between the grid of MOS transistor Q2 and source electrode, be provided with resistance R 3.
Wherein, in resistance R 3, be parallel with capacitor C 2.
Wherein, lithium ion protection chip is DW01.
Wherein, MOS transistor Q1 and MOS transistor Q2 are integrated in a chip, and chip is CEG8205.
The beneficial effects of the utility model: compared with the lithium battery protection circuit of prior art, increased the protection of the chip to lithium battery protection circuit, by the V of the chip at lithium battery protection circuit
-pin increases diode D1, at C
oUTpin increases diode D2, burning out chip while preventing lithium battery in reverse charging or in electric discharge.
Brief description of the drawings
Fig. 1 is the circuit diagram of the utility model embodiment mono-;
Fig. 2 is the circuit diagram of the utility model embodiment bis-.
Embodiment:
For setting forth thought of the present utility model and object, below in conjunction with the drawings and specific embodiments, the utility model is further described.
Embodiment mono-, as shown in Figure 1, a kind of lithium battery protection circuit of the present utility model, comprises charging end P+, charging end P-, diode D1, lithium ion protection chip, MOS transistor Q1 and MOS transistor Q2, the V of lithium ion protection chip
dDpin is connected with the positive pole of lithium battery by resistance R 1, and charging end P+ is connected with the positive pole of lithium battery, the V of lithium ion protection chip
dDpin is connected with the negative pole of lithium battery by capacitor C 1, the D of lithium ion protection chip
oUTpin is connected with the grid of MOS transistor Q1, and the drain electrode of MOS transistor Q1 is connected with the negative pole of lithium battery, and the source electrode of MOS transistor Q1 is connected with the drain electrode of MOS transistor Q2, the C of the grid of MOS transistor Q2 and lithium ion protection chip
oUTpin is connected, and the source electrode of MOS transistor Q2 is connected with charging end P-, the V of lithium ion protection chip
-pin is connected with charging end P-by resistance R 2, the V of lithium ion protection chip
-be connected with the positive pole of diode D1, the negative pole of diode D1 is connected with charging end P+.In the present embodiment, lithium ion protection chip is DW01, and MOS transistor Q1 and MOS transistor Q2 are integrated in a chip, and chip is CEG8205.
The lithium ion protection chip of DW01, in protection lithium battery process, in the time there is short circuit or electric discharge overcurrent, makes D
oUTpin control MOS transistor Q1 disconnects, and at this moment under the effect of reverse charging device, may make the level of V-pin higher than V
dD+ 0.3V, V-pin inside may be breakdown, causes the damage of protection chip.In order to prevent the generation of this situation, between V-and P+, meet diode D1, thereby the level that ensures V-pin is not higher than V
dD+ 0.3V, thus V-pin effectively protected.Adding after D1 the work on lithium ion protection chip not affect.
Embodiment bis-, as shown in Figure 2, the present embodiment is by the C at lithium ion protection chip on the basis of embodiment mono-
oUTbetween the grid of pin and MOS transistor Q2, be provided with diode D2, be used for preventing that MOS transistor Q2 is breakdown, concrete annexation is as follows:
The C of lithium ion protection chip
oUTpin is connected with the positive pole of diode D2, and the grid of MOS transistor Q2 is connected with the negative pole of diode D2.Between the grid of MOS transistor Q2 and source electrode, be provided with resistance R 3.In resistance R 3, be parallel with capacitor C 2.
The lithium ion protection chip of DW01, in protection lithium battery process, in the time there is short circuit or electric discharge overcurrent, makes D
oUTpin control MOS transistor Q1 disconnects, and under the effect of reverse charging device, the magnitude of voltage of voltage source can be added in grid G and source S two pins of MOS transistor Q2, now V
s>V
g, in the time that the magnitude of voltage of voltage source is greater than the withstand voltage of MOS transistor Q2, MOS transistor Q2 can be punctured, for preventing this phenomenon sounding, at the C of lithium ion protection chip
oUTbetween the grid of pin and MOS transistor Q2, be provided with diode D2, and the C of lithium ion protection chip
oUTpin is connected with the positive pole of diode D2, and the grid of MOS transistor Q2 is connected with the negative pole of diode D2, due to the access of diode D2, makes C
oUTpin output is cut off by diode D2, due to the existence of resistance R 3 and capacitor C 2, makes V simultaneously
s=V
g, can there is not breakdown phenomenon in MOS transistor Q2, thereby protected MOS transistor Q2.
In other embodiments, can omit resistance R 3 and capacitor C 2.
More than that lithium battery protection circuit provided by the utility model is described in detail, applied specific case herein structural principle of the present utility model and execution mode are set forth, above embodiment is just for helping to understand method of the present utility model and core concept thereof; , for one of ordinary skill in the art, according to thought of the present utility model, all will change in specific embodiments and applications, to sum up, this description should not be construed as restriction of the present utility model meanwhile.
Claims (6)
1. a lithium battery protection circuit, is characterized in that, comprises charging end P+, charging end P-, diode D1, lithium ion protection chip, MOS transistor Q1 and MOS transistor Q2, the V of described lithium ion protection chip
dDpin is connected with the positive pole of lithium battery by resistance R 1, and described charging end P+ is connected with the positive pole of lithium battery, the V of described lithium ion protection chip
dDpin is connected with the negative pole of lithium battery by capacitor C 1, the D of described lithium ion protection chip
oUTpin is connected with the grid of described MOS transistor Q1; the drain electrode of described MOS transistor Q1 is connected with the negative pole of lithium battery; the source electrode of described MOS transistor Q1 is connected with the drain electrode of described MOS transistor Q2, the C of the grid of described MOS transistor Q2 and described lithium ion protection chip
oUTpin is connected, and the source electrode of described MOS transistor Q2 is connected with described charging end P-, the V of described lithium ion protection chip
-pin is connected with described charging end P-by resistance R 2, the V of described lithium ion protection chip
-be connected with the positive pole of diode D1, the negative pole of described diode D1 is connected with described charging end P+.
2. lithium battery protection circuit according to claim 1, is characterized in that, the C of described lithium ion protection chip
oUTbetween the grid of pin and described MOS transistor Q2, be provided with diode D2, and the C of described lithium ion protection chip
oUTpin is connected with the positive pole of described diode D2, and the grid of described MOS transistor Q2 is connected with the negative pole of described diode D2.
3. lithium battery protection circuit according to claim 2, is characterized in that, is provided with resistance R 3 between the grid of described MOS transistor Q2 and source electrode.
4. lithium battery protection circuit according to claim 3, is characterized in that, in described resistance R 3, is parallel with capacitor C 2.
5. lithium battery protection circuit according to claim 1, is characterized in that, described lithium ion protection chip is DW01.
6. lithium battery protection circuit according to claim 1, is characterized in that, described MOS transistor Q1 and MOS transistor Q2 are integrated in a chip, and described chip is CEG8205.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420034437.2U CN203722213U (en) | 2014-01-20 | 2014-01-20 | Lithium battery protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420034437.2U CN203722213U (en) | 2014-01-20 | 2014-01-20 | Lithium battery protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203722213U true CN203722213U (en) | 2014-07-16 |
Family
ID=51161339
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420034437.2U Expired - Fee Related CN203722213U (en) | 2014-01-20 | 2014-01-20 | Lithium battery protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203722213U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105322590A (en) * | 2014-07-29 | 2016-02-10 | 深圳市倍斯特电源有限公司 | Mobile power supply possessing desk lamp function |
| CN109193903A (en) * | 2018-10-18 | 2019-01-11 | 深圳市聚立创科技有限公司 | A kind of remote controler |
-
2014
- 2014-01-20 CN CN201420034437.2U patent/CN203722213U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105322590A (en) * | 2014-07-29 | 2016-02-10 | 深圳市倍斯特电源有限公司 | Mobile power supply possessing desk lamp function |
| CN105322590B (en) * | 2014-07-29 | 2018-06-26 | 深圳市倍斯特科技股份有限公司 | A kind of mobile power with function of desk lamp |
| CN109193903A (en) * | 2018-10-18 | 2019-01-11 | 深圳市聚立创科技有限公司 | A kind of remote controler |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140716 Termination date: 20220120 |