CN204290423U - Lithium battery charging circuit - Google Patents
Lithium battery charging circuit Download PDFInfo
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- CN204290423U CN204290423U CN201420857721.XU CN201420857721U CN204290423U CN 204290423 U CN204290423 U CN 204290423U CN 201420857721 U CN201420857721 U CN 201420857721U CN 204290423 U CN204290423 U CN 204290423U
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Abstract
The utility model discloses a kind of lithium battery charging circuit, comprise charge management module and lithium battery, it is characterized in that: described lithium battery charging circuit also comprises one to be prevented over-charge of lithium battery and crosses the protective circuit of putting, and described protective circuit comprises Li battery protection IC and switch chip; The output head anode of described charge management module is connected with the positive source of the positive pole of lithium battery, Li battery protection IC, and the negative pole of described lithium battery is connected with a link of the power cathode of Li battery protection IC, switch chip; Another link of described switch chip is connected with the earth terminal of charge management module; The output of described Li battery protection IC is connected with the control end of switch chip.
Description
Technical field
The utility model relates to a kind of for the circuit of electric energy meter reserve battery charging, is specifically a kind of lithium battery charging circuit.
Background technology
The lithium battery charging circuit of prior art is a charge management module, and the input of this charge management module is connected with the both positive and negative polarity of charger; The output of this charge management module is connected with lithium battery.During charging, directly by charge management module, lithium battery is charged.The lithium battery charging circuit of said structure has the following disadvantages in the use procedure of reality: the lithium battery charging circuit of said structure can only record the number of charge volume and charge, but because lithium battery electricity under different environmental conditions has difference, this just causes over-charge of lithium battery or is not fully filled, for a long time the charging capacity of lithium battery can be caused like this to reduce, and then affect the useful life of lithium battery.In addition, lithium battery is not in the course of the work owing to having Cross prevention, and therefore the generation of this situation also can affect the useful life of lithium battery.Therefore, for these reasons, urgently need a kind of lithium battery charging circuit, this circuit has an overshoot and crosses the protective circuit of putting, and can prevent from over-charge of lithium battery and cross putting, to solve the problem.
Utility model content
The technical problems to be solved in the utility model is, provides a kind of lithium battery charging circuit, and this circuit has an overshoot and crosses the protective circuit of putting, and can prevent from over-charge of lithium battery and cross putting.
The technical solution of the utility model is, a kind of lithium battery charging circuit is provided, comprise charge management module and lithium battery, described lithium battery charging circuit also comprises one to be prevented over-charge of lithium battery and crosses the protective circuit of putting, and described protective circuit comprises Li battery protection IC and switch chip; The output head anode of described charge management module is connected with the positive source of the positive pole of lithium battery, Li battery protection IC, and the negative pole of described lithium battery is connected with a link of the power cathode of Li battery protection IC, switch chip; Another link of described switch chip is connected with the earth terminal of charge management module; The output of described Li battery protection IC is connected with the control end of switch chip.
Described Li battery protection IC has two signal output parts; Described switch chip is two, is respectively the first switch chip and second switch chip; One link of described first switch chip is connected with the negative pole of lithium battery, and another link of described first switch chip is connected with a link of second switch chip; Another link of described second switch chip is connected with the earth terminal of charge management module; Two described signal output parts are connected with the control end of the first switch chip, the control end of second switch chip respectively.
Described charge management module comprises power management chip U1, resistance R1, R2, R3, electric capacity C2, C3; The TMR pin of described power management chip U1 is connected with one end of resistance R1, and the IN pin of described power management chip U1 is connected with one end of electric capacity C2; The other end of described resistance R1, the other end of electric capacity C2 are connected with earth terminal; OUT pin, the BAT pin of described power management chip U1 are connected with one end of electric capacity C3; The CE pin of described power management chip U1 is connected with one end of resistance R3; The ISET pin of described power management chip U1 is connected with one end of resistance R2; The other end of the other end of described electric capacity C3, the other end of resistance R2, resistance R3 is all connected with earth terminal.
An electric capacity C1 for preventing charging current excessive is connected with between the both positive and negative polarity of described charging management chip charging input end.
The model of described Li battery protection IC is S8261; The first described switch chip and second switch chip are a monoblock switch chip, and the model of this monoblock chip is US6K1; The VDD pin of described Li battery protection IC is connected with the output head anode of resistance R4, charge management module; Described VM pin is connected with resistance R5, earth terminal; The VSS pin of described Li battery protection IC is connected with the negative pole of lithium battery; The CO output pin of described Li battery protection IC is connected with 5,2 two control pins of monoblock switch chip respectively with DO output pin; 3,6 two connecting pins of described monoblock switch chip connect; 1 connecting pin of described monoblock switch chip is connected with the negative pole of lithium battery; 4 connecting pins of described monoblock switch chip are connected with earth terminal.
After adopting above structure, the utility model compared with prior art, has the following advantages:
The utility model lithium battery charging circuit prevents from over-charge of lithium battery by one and crosses the protective circuit of putting electric current on charge management module and lithium battery being detected; and send signal to switch chip according to the data of voltage and current; switch chip is disconnected; thus avoid to over-charge of lithium battery or be not fully filled, and then ensure the useful life of lithium battery.In addition, this protective circuit also at the real-time voltage and current detected on lithium battery, is crossed to prevent lithium battery and is put, thus ensures the normal service life of lithium battery.
As improvement, described Li battery protection IC has two signal output parts; Described switch chip is two, is respectively the first switch chip and second switch chip; One link of described first switch chip is connected with the negative pole of lithium battery, and another link of described first switch chip is connected with a link of second switch chip; Another link of described second switch chip is connected with the earth terminal of charge management module; Two described signal output parts are connected with the control end of the first switch chip, the control end of second switch chip respectively.The setting of this structure can detect voltage and current, thus controls output signal respectively, makes can charge normal when only having these two conditions to meet, thus improves the functional reliability of the utility model lithium battery charging circuit.
As improvement, between the both positive and negative polarity of described charging management chip charging input end, be connected with an electric capacity C1 for preventing charging current excessive.This electric capacity C1 effectively can absorb the big current of charging, thus improves the functional reliability of the utility model lithium battery charging circuit further.
Accompanying drawing explanation
Fig. 1 is the circuit block diagram of the utility model lithium battery charging circuit.
Fig. 2 is the circuit theory diagrams of the utility model lithium battery charging circuit.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
As shown in Figure 1 and Figure 2, a kind of lithium battery charging circuit of the utility model, comprise charge management module and lithium battery, it is characterized in that: described lithium battery charging circuit also comprises one to be prevented over-charge of lithium battery and crosses the protective circuit of putting, and described protective circuit comprises Li battery protection IC and switch chip; The output head anode of described charge management module is connected with the positive source of the positive pole of lithium battery, Li battery protection IC, and the negative pole of described lithium battery is connected with a link of the power cathode of Li battery protection IC, switch chip; Another link of described switch chip is connected with the earth terminal of charge management module; The output of described Li battery protection IC is connected with the control end of switch chip.
Described Li battery protection IC has two signal output parts; Described switch chip is two, is respectively the first switch chip and second switch chip; One link of described first switch chip is connected with the negative pole of lithium battery, and another link of described first switch chip is connected with a link of second switch chip; Another link of described second switch chip is connected with the earth terminal of charge management module; Two described signal output parts are connected with the control end of the first switch chip, the control end of second switch chip respectively.
Described charge management module comprises power management chip U1, resistance R1, R2, R3, electric capacity C2, C3; The TMR pin of described power management chip U1 is connected with one end of resistance R1, and the IN pin of described power management chip U1 is connected with one end of electric capacity C2; The other end of described resistance R1, the other end of electric capacity C2 are connected with earth terminal; OUT pin, the BAT pin of described power management chip U1 are connected with one end of electric capacity C3; The CE pin of described power management chip U1 is connected with one end of resistance R3; The ISET pin of described power management chip U1 is connected with one end of resistance R2; The other end of the other end of described electric capacity C3, the other end of resistance R2, resistance R3 is all connected with earth terminal.This chip can manage the charging of lithium battery, constant current charge, has overtemperature protection, short-circuit protection, the protection of battery disappearance.
An electric capacity C1 for preventing charging current excessive is connected with between the both positive and negative polarity of described charging management chip charging input end.This electric capacity C1 alleviates the impact minimizing interference to external power source.
The model of described Li battery protection IC is S8261; The first described switch chip and second switch chip are a monoblock switch chip, and the model of this monoblock chip is US6K1; The VDD pin of described Li battery protection IC is connected with the output head anode of resistance R4, charge management module; Described VM pin is connected with resistance R5, earth terminal; The VSS pin of described Li battery protection IC is connected with the negative pole of lithium battery; The CO output pin of described Li battery protection IC is connected with 5,2 two control pins of monoblock switch chip respectively with DO output pin; 3,6 two connecting pins of described monoblock switch chip connect; 1 connecting pin of described monoblock switch chip is connected with the negative pole of lithium battery; 4 connecting pins of described monoblock switch chip are connected with earth terminal.Namely by the folding of two metal-oxide-semiconductors in DO and CO foot control monoblock switch chip US6K1.This chip can over-charge protective, charging current abnormal protection, Cross prevention, overcurrent protection, load short circuits protection; Extremely pin is outputed signal: DO (first three is planted) and CO (latter two); Signal pin control FDN304.
In FDN304:(primary circuit figure, US6K1 changes FDN304 into) inner to be made up of two metal-oxide-semiconductors, control conducting by DO and CO respectively and turn off.
Below only just most preferred embodiment of the present utility model is described, but can not be interpreted as it is limitations on claims.The utility model is not limited only to above embodiment, and its concrete structure allows to change.In every case the various change done in the protection range of the utility model independent claims is all in protection range of the present utility model.
Claims (5)
1. a lithium battery charging circuit, comprise charge management module and lithium battery, it is characterized in that: described lithium battery charging circuit also comprises one to be prevented over-charge of lithium battery and crosses the protective circuit of putting, and described protective circuit comprises Li battery protection IC and switch chip; The output head anode of described charge management module is connected with the positive source of the positive pole of lithium battery, Li battery protection IC, and the negative pole of described lithium battery is connected with a link of the power cathode of Li battery protection IC, switch chip; Another link of described switch chip is connected with the earth terminal of charge management module; The output of described Li battery protection IC is connected with the control end of switch chip.
2. lithium battery charging circuit according to claim 1, is characterized in that: described Li battery protection IC has two signal output parts; Described switch chip is two, is respectively the first switch chip and second switch chip; One link of described first switch chip is connected with the negative pole of lithium battery, and another link of described first switch chip is connected with a link of second switch chip; Another link of described second switch chip is connected with the earth terminal of charge management module; Two described signal output parts are connected with the control end of the first switch chip, the control end of second switch chip respectively.
3. lithium battery charging circuit according to claim 1, is characterized in that: described charge management module comprises power management chip U1, resistance R1, R2, R3, electric capacity C2, C3; The TMR pin of described power management chip U1 is connected with one end of resistance R1, and the IN pin of described power management chip U1 is connected with one end of electric capacity C2; The other end of described resistance R1, the other end of electric capacity C2 are connected with earth terminal; OUT pin, the BAT pin of described power management chip U1 are connected with one end of electric capacity C3; The CE pin of described power management chip U1 is connected with one end of resistance R3; The ISET pin of described power management chip U1 is connected with one end of resistance R2; The other end of the other end of described electric capacity C3, the other end of resistance R2, resistance R3 is all connected with earth terminal.
4. lithium battery charging circuit according to claim 1, is characterized in that: be connected with an electric capacity C1 for preventing charging current excessive between the both positive and negative polarity of described charging management chip charging input end.
5. lithium battery charging circuit according to claim 2, is characterized in that: the model of described Li battery protection IC is S8261; The first described switch chip and second switch chip are a monoblock switch chip, and the model of this monoblock chip is US6K1; The VDD pin of described Li battery protection IC is connected with the output head anode of resistance R4, charge management module; Described VM pin is connected with resistance R5, earth terminal; The VSS pin of described Li battery protection IC is connected with the negative pole of lithium battery; The CO output pin of described Li battery protection IC is connected with 5,2 two control pins of monoblock switch chip respectively with DO output pin; 3,6 two connecting pins of described monoblock switch chip connect; 1 connecting pin of described monoblock switch chip is connected with the negative pole of lithium battery; 4 connecting pins of described monoblock switch chip are connected with earth terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420857721.XU CN204290423U (en) | 2014-12-30 | 2014-12-30 | Lithium battery charging circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420857721.XU CN204290423U (en) | 2014-12-30 | 2014-12-30 | Lithium battery charging circuit |
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| CN204290423U true CN204290423U (en) | 2015-04-22 |
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| CN201420857721.XU Active CN204290423U (en) | 2014-12-30 | 2014-12-30 | Lithium battery charging circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104701930A (en) * | 2014-12-30 | 2015-06-10 | 宁波三星电气股份有限公司 | Lithium battery charging circuit |
| CN107222014A (en) * | 2017-07-21 | 2017-09-29 | 东莞市钜大电子有限公司 | A kind of solar charging circuit of lithium battery |
| CN113559350A (en) * | 2021-08-02 | 2021-10-29 | 北京哈特凯尔医疗科技有限公司 | Control circuit of hydration treatment liquid inlet and outlet balance system |
-
2014
- 2014-12-30 CN CN201420857721.XU patent/CN204290423U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104701930A (en) * | 2014-12-30 | 2015-06-10 | 宁波三星电气股份有限公司 | Lithium battery charging circuit |
| CN107222014A (en) * | 2017-07-21 | 2017-09-29 | 东莞市钜大电子有限公司 | A kind of solar charging circuit of lithium battery |
| CN107222014B (en) * | 2017-07-21 | 2024-02-02 | 东莞市钜大电子有限公司 | Solar charging circuit of lithium battery |
| CN113559350A (en) * | 2021-08-02 | 2021-10-29 | 北京哈特凯尔医疗科技有限公司 | Control circuit of hydration treatment liquid inlet and outlet balance system |
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Address after: 315191 Yinzhou Industrial Park, Zhejiang, Ningbo, Yinzhou District, Ningbo Patentee after: NINGBO SANXING MEDICAL ELECTRIC CO., LTD. Address before: 315131, AUX Industrial Park, Mingguang North Road, Jiangshan Town, Ningbo, Yinzhou District, Zhejiang 1166, China Patentee before: Ningbo Sanxing Electric Co., Ltd. |