CN103545891A - Lithium battery charging circuit - Google Patents
Lithium battery charging circuit Download PDFInfo
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- CN103545891A CN103545891A CN201310527460.5A CN201310527460A CN103545891A CN 103545891 A CN103545891 A CN 103545891A CN 201310527460 A CN201310527460 A CN 201310527460A CN 103545891 A CN103545891 A CN 103545891A
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Abstract
The invention discloses a lithium battery charging circuit. The lithium battery charging circuit comprises a first constant flow source charging circuit and a second constant flow source charging circuit, wherein the first constant flow source charging circuit and the second constant flow source charging circuit are same, the output end of the first constant flow source charging circuit and the output end of the second constant flow source charging circuit are connected to a battery holder J1 after parallel connection. According to the lithium battery charging circuit, the two same constant flow source charging circuits are connected in parallel to equally share work of the system and currents needed for charging a battery, and therefore not only can power supplying capacity of the charging currents be improved, but also power consumption and heating generating amount of a signal charging management chip are reduced, and charging work of the large-capacity battery is completed rapidly and stably.
Description
Technical field
The present invention relates to a kind of charging circuit, relate in particular to a kind of lithium battery charging circuit.
Background technology
At present, mobile electronic product adopts lithium battery power supply more, as smart mobile phone, panel computer etc.Due to properties of product from strength to strength, function is more and more, must bring the increase of power consumption and weakening of battery flying power.For example, smart mobile phone not only can be made a phone call, be sent short messages, and can also surf the Net, plays games, see a film.When using these functions, because battery need to provide very large electric current, just will inevitably produce the problem of battery flying power deficiency.For this problem, manufacturer reduces the power consumption of product on the one hand as far as possible, on the other hand the larger battery of choice for use capacity.
The increase of mobile electronic product oneself power consumption and the increase of battery capacity, all have higher requirement to lithium cell charging.For example, the lithium battery of 1000mAh, if adopt 500mA charging circuit to charge, just can be full of for about 2 hours.If select the battery of 3000mAh in order to improve the flying power of product, but still adopt 500mA charging circuit to charge, need the time of more than 6 hour battery could be full of.In order to shorten the charging interval, must improve charging current.And the raising of charging current can increase the power consumption of charging chip, may cause the system failure due to heat dissipation problem.Therefore, manufacturer can be very careful when the charging circuit that select to surpass 1A comes for lithium cell charging.
Lithium battery charging circuit generally all has to lithium cell charging with to two kinds of functions of system power supply.But because the power supply capacity of charging management chip self is certain, if the electric current that system works needs increases, will certainly cause reducing of battery charge.If the power supply capacity of charging management chip self can't meet the needs of system works, battery not only can not be recharged, also be necessary for system power supply, maintain the normal operation of system, directly cause battery charging situation very slow or that battery electric quantity fills fewer and fewer to occur.
The basic method addressing the above problem is to improve the power supply capacity of charging circuit.Due to simultaneously, for system power supply with for battery charging need to provide very large electric current, common charging circuit is difficult to meet the demands.
summary of the invention
The object of this invention is to provide a kind of lithium battery charging circuit, can improve the power supply capacity of charging circuit, meet the requirement of system power supply and battery charging simultaneously, also there is the charging management chip power consumption of reduction and chip caloric value.
The present invention adopts following technical proposals:
, comprise the first identical constant current source charging circuit and the second constant current source charging circuit, after the output parallel connection of the first and second constant current source charging circuit, connect battery tray J1.
The first described constant current source charging circuit comprises charging management chip, and charge power supply input connects the VIN pin of charging management chip, and charge power supply input is also by the first electric capacity and the second capacity earth in parallel; The VBAT pin of charging management chip is respectively by the 3rd electric capacity and the 4th capacity earth, and the IREF pin of charging management chip is by the first grounding through resistance, and the IMIN pin of charging management chip is by the second grounding through resistance.
In the first and second described constant current source charging circuit, the VBAT pin parallel connection of two charging management chips connects the positive pole of battery tray J1 afterwards.
On the first or second described constant current source charging circuit, be also provided with charging indication and power indicating circuit, described charging indication comprises the first light-emitting diode and the 3rd resistance, the positive pole of the first light-emitting diode connects the VBAT pin of charging management chip, the negative pole of the first light-emitting diode connects the 3rd resistance first end, and the second end of the 3rd resistance connects the PPR pin of charging management chip; Described power indicating circuit comprises the second light-emitting diode and the 4th resistance, the positive pole of the second light-emitting diode connects the VBAT pin of charging management chip, the negative pole of the second light-emitting diode connects the 4th resistance first end, and the second end of the 4th resistance connects the CHG pin of charging management chip.
Described charging management chip adopts SGM4056.
First to fourth described electric capacity all adopts ceramic disc capacitor.
First to fourth described resistance all adopts plate resistor.
The present invention is together in parallel two identical constant current source charging circuit, on average share system works and the battery required electric current that charges, can either improve the power supply capacity of charging current, the power consumption and the chip caloric value that reduce again single charging management chip complete high capacity cell charging work fast and stable.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present invention.
Embodiment
As shown in Figure 1, the present invention includes the first identical constant current source charging circuit and the second constant current source charging circuit, after the output parallel connection of the first and second constant current source charging circuit, connect battery tray J1.The first and second constant current source charging circuit include charging management chip U, and charging management chip U can adopt single-lithium-battery pond linear-charging managing chip SGM4056.Charge power supply input DCIN connects the VIN pin of charging management chip U, and charge power supply input DCIN is also by the first capacitor C 1 and the second capacitor C 2 ground connection in parallel, and the first capacitor C 1 and the second capacitor C 2 form the input filter capacitor of charging management chip U.The VBAT pin of charging management chip U is respectively by the 3rd capacitor C 3 and the 4th capacitor C 4 ground connection, and the 3rd capacitor C 3 and the 4th capacitor C 4 form the output filter capacitor of charging management chip U.The IREF pin of charging management chip U is by the first resistance R 1 ground connection, and the charging current that the first resistance R 1 can limit charging management chip U is 500mA.The IMIN pin of charging management chip U is by the second resistance R 2 ground connection, and the charging cut-off current that the second resistance R 2 can limit charging management chip U is 55mA.In the first and second constant current source charging circuit, the VBAT pin parallel connection of two charging management chip U connects the anodal pin P3 of battery tray J1 afterwards, the first pin P1 of battery tray J1 and the second pin P2 ground connection.
For the ease of display working condition, on the first or second constant current source charging circuit, be also provided with charging indication and power indicating circuit, described charging indication comprises the first light-emitting diode D1 and the 3rd resistance R 3, the positive pole of the first light-emitting diode D1 connects the VBAT pin of charging management chip U, the negative pole of the first light-emitting diode D1 connects the 3rd resistance R 3 first ends, and the second end of the 3rd resistance R 3 connects charging management chip U's
pin; Described power indicating circuit comprises the second light-emitting diode D2 and the 4th resistance R 4, the positive pole of the second light-emitting diode D2 connects the VBAT pin of charging management chip U, the negative pole of the second light-emitting diode D2 connects the 4th resistance R 4 first ends, and the second end of the 4th resistance R 4 connects charging management chip U's
pin.
In the present embodiment, first to fourth electric capacity all adopts ceramic disc capacitor; First to fourth resistance R 4 all adopts plate resistor.
The single-lithium-battery pond linear-charging managing chip SGM4056 adopting in the present invention, has the following advantages: 1. input withstand voltage height, VIN can arrive 26.5V;
2. have over-voltage protecting function, when input voltage surpasses certain threshold value (SGM4056-6.8 is 6.8V, and SGM4056-10.5 is 10.5V), charging management chip U can enter overvoltage protection state;
3. can automatically select constant voltage/constant current charging modes according to cell voltage;
4. there is 1% Voltage-output precision;
5. size is little, and TDFN-2 * 2-8L encapsulation only has 2mm*2mm;
6. can provide the charging current that is 900mA to the maximum.
In the present invention, each charging management chip U all can provide separately the charging current of 500mA; The present invention is together in parallel these two identical constant current source charging circuit, according to Kirchhoff's current law (KCL), finally can form the charging current of 1000mA, two charging management chip U on average share system works and the battery required electric current that charges, can improve the power supply capacity of charging current, the power consumption and the chip caloric value that reduce single charging management chip U complete high capacity cell charging work fast and stable.
Claims (7)
1. a lithium battery charging circuit, is characterized in that: comprise the first identical constant current source charging circuit and the second constant current source charging circuit, after the output parallel connection of the first and second constant current source charging circuit, connect battery tray J1.
2. lithium battery charging circuit according to claim 1, it is characterized in that: the first described constant current source charging circuit comprises charging management chip, charge power supply input connects the VIN pin of charging management chip, and charge power supply input is also by the first electric capacity and the second capacity earth in parallel; The VBAT pin of charging management chip is respectively by the 3rd electric capacity and the 4th capacity earth, and the IREF pin of charging management chip is by the first grounding through resistance, and the IMIN pin of charging management chip is by the second grounding through resistance.
3. lithium battery charging circuit according to claim 2, is characterized in that: in the first and second described constant current source charging circuit, the VBAT pin parallel connection of two charging management chips connects the positive pole of battery tray J1 afterwards.
4. lithium battery charging circuit according to claim 3, it is characterized in that: on the first or second described constant current source charging circuit, be also provided with charging indication and power indicating circuit, described charging indication comprises the first light-emitting diode and the 3rd resistance, the positive pole of the first light-emitting diode connects the VBAT pin of charging management chip, the negative pole of the first light-emitting diode connects the 3rd resistance first end, and the second end of the 3rd resistance connects the PPR pin of charging management chip; Described power indicating circuit comprises the second light-emitting diode and the 4th resistance, the positive pole of the second light-emitting diode connects the VBAT pin of charging management chip, the negative pole of the second light-emitting diode connects the 4th resistance first end, and the second end of the 4th resistance connects the CHG pin of charging management chip.
5. lithium battery charging circuit according to claim 4, is characterized in that: described charging management chip adopts SGM4056.
6. lithium battery charging circuit according to claim 5, is characterized in that: first to fourth described electric capacity all adopts ceramic disc capacitor.
7. lithium battery charging circuit according to claim 6, is characterized in that: first to fourth described resistance all adopts plate resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310527460.5A CN103545891A (en) | 2013-10-31 | 2013-10-31 | Lithium battery charging circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310527460.5A CN103545891A (en) | 2013-10-31 | 2013-10-31 | Lithium battery charging circuit |
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| CN103545891A true CN103545891A (en) | 2014-01-29 |
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| CN201310527460.5A Pending CN103545891A (en) | 2013-10-31 | 2013-10-31 | Lithium battery charging circuit |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105098925A (en) * | 2015-09-09 | 2015-11-25 | 厦门美图移动科技有限公司 | Method, system and mobile phone charger for dynamic adjustment of charging current |
| CN105656115A (en) * | 2015-11-30 | 2016-06-08 | 东莞酷派软件技术有限公司 | Dual channel charging method, system and terminal thereof |
| CN105762884A (en) * | 2014-12-24 | 2016-07-13 | 广东欧珀移动通信有限公司 | Method for charging electronic equipment, and electronic equipment |
| CN105914810A (en) * | 2014-12-24 | 2016-08-31 | 广东欧珀移动通信有限公司 | Method for charging electronic equipment, and electronic equipment |
| CN109066884A (en) * | 2018-09-03 | 2018-12-21 | Oppo广东移动通信有限公司 | Charging circuit and electronic equipment |
| CN113741284A (en) * | 2021-09-06 | 2021-12-03 | 深圳市蓝丝腾科技有限公司 | Household intelligent supervision system |
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| JP2005198445A (en) * | 2004-01-08 | 2005-07-21 | Yamaha Motor Co Ltd | Charging management system and charging management device |
| CN101789615A (en) * | 2010-01-09 | 2010-07-28 | 黄宇嵩 | Outfield special constant-current power compensating device for model airplane battery |
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| JP2005198445A (en) * | 2004-01-08 | 2005-07-21 | Yamaha Motor Co Ltd | Charging management system and charging management device |
| CN101789615A (en) * | 2010-01-09 | 2010-07-28 | 黄宇嵩 | Outfield special constant-current power compensating device for model airplane battery |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105762884A (en) * | 2014-12-24 | 2016-07-13 | 广东欧珀移动通信有限公司 | Method for charging electronic equipment, and electronic equipment |
| CN105914810A (en) * | 2014-12-24 | 2016-08-31 | 广东欧珀移动通信有限公司 | Method for charging electronic equipment, and electronic equipment |
| CN105762884B (en) * | 2014-12-24 | 2020-01-17 | Oppo广东移动通信有限公司 | Method for charging electronic device and electronic device |
| CN105914810B (en) * | 2014-12-24 | 2020-06-05 | Oppo广东移动通信有限公司 | Method for charging electronic device and electronic device |
| CN105098925A (en) * | 2015-09-09 | 2015-11-25 | 厦门美图移动科技有限公司 | Method, system and mobile phone charger for dynamic adjustment of charging current |
| CN105656115A (en) * | 2015-11-30 | 2016-06-08 | 东莞酷派软件技术有限公司 | Dual channel charging method, system and terminal thereof |
| CN105656115B (en) * | 2015-11-30 | 2019-05-14 | 东莞酷派软件技术有限公司 | A kind of binary channels charging method, system and terminal |
| CN109066884A (en) * | 2018-09-03 | 2018-12-21 | Oppo广东移动通信有限公司 | Charging circuit and electronic equipment |
| CN113741284A (en) * | 2021-09-06 | 2021-12-03 | 深圳市蓝丝腾科技有限公司 | Household intelligent supervision system |
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Application publication date: 20140129 |
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