CN101505066A - Trickle charging circuit for mobile phone - Google Patents
Trickle charging circuit for mobile phone Download PDFInfo
- Publication number
- CN101505066A CN101505066A CNA2009100470148A CN200910047014A CN101505066A CN 101505066 A CN101505066 A CN 101505066A CN A2009100470148 A CNA2009100470148 A CN A2009100470148A CN 200910047014 A CN200910047014 A CN 200910047014A CN 101505066 A CN101505066 A CN 101505066A
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- Prior art keywords
- mobile phone
- charging
- trickle
- battery
- circuit
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Abstract
The invention discloses a trickle-charging circuit of a mobile phone. The trickle-charging function of a mobile phone is realized by arranging a resistor, a protecting diode and a clamping diode in the prior charging circuit of the mobile phone without the trickle-charging function.
Description
Technical field
The present invention relates to the charging circuit field, particularly a kind of trickle charging circuit of mobile phone.
Background technology
In the present mobile phone circuit, the design of charging is generally: if the cell voltage of mobile phone is lower than 3.2V, plug charger so, mobile phone can carry out trickle charge to battery of mobile phone, its objective is in order to raise cell voltage to make battery enter the stage of constant current charge as early as possible.Greater than 3.2V during less than 4.2V, mobile phone can come battery is carried out constant current charge and constant voltage charge according to the set point of program or the maximum output current of charger at cell voltage, reaches 4.2V up to the battery electric quantity of mobile phone, and charging finishes.But because the master chip of some mobile phone does not have the integrated charge chip, charging circuit will be realized by adding charging chip, and because problems such as the design of charging chip and costs, some charging chip does not have the trickle charge function, when causing the electric weight of battery of mobile phone to be lower than 3.2V, battery of mobile phone can't charge; Perhaps can have a strong impact on the useful life of battery with bigger continuous current charging to a under-voltage battery.
Summary of the invention
The trickle charging circuit that the purpose of this invention is to provide a kind of mobile phone is realized the trickle charge function when battery of mobile phone voltage is lower than 3.2V.
The invention provides a kind of trickle charging circuit of mobile phone; be applicable to cell-phone charging chip circuit with trickle charge function; comprise the charging chip circuit; also comprise resistance; protection diode and clamp diode; one end of described resistance is connected the input of described cell-phone charging chip; this input connects the output of charger for mobile phone; the other end of described resistance connects the positive pole of described protection diode; the negative pole of described protection diode is connected the output of described cell-phone charging chip; this output connects the input of battery of mobile phone; the negative pole of described clamp diode is connected between described resistance and the protection diode, its plus earth.
Described clamp diode is the 4.2V clamp diode.
The charging voltage of described charger for mobile phone is 5V, and described resistance is 300 ohm.
Adopt the trickle charging circuit of a kind of mobile phone of the present invention,, just realized the trickle charge function of mobile phone by on original cell phone charging circuit, increasing several simple elements.When even the cell voltage of mobile phone is lower than 3.2V, also can realize the trickle charge function of battery of mobile phone by the present invention, and after charging finishes, make charging current ground connection, realize protection to battery.
Description of drawings
Fig. 1 is the described cell-phone charging chip circuit that does not have the trickle charge function;
Fig. 2 is the electrical schematic diagram of the improvement part of Fig. 1 circuit.
Embodiment
Further specify technical scheme of the present invention below in conjunction with drawings and Examples.
Referring to Fig. 1, Fig. 1 is the cell-phone charging chip circuit with trickle charge function, the defective of this charging chip circuit is that constant current and constant voltage charge can only be provided, when the battery of overdischarge charges, just charge with very big continuous current after plugging charger, the charging of this flow process has certain influence to the life-span of battery.Among Fig. 1, the CHG_VIN among the charging chip D631 is the input of charging chip, links the output of charger, and VBAT is the output of charging chip, links the electrode input end of battery of mobile phone.CHG_CTRL is the Enable Pin of charging chip, CHG_PPR be used to refer to charger existence whether, CHG_DET is used for doing the charged state indication, IREF connects the resistance of 39.2K to ground, the electric current during constant current charge is exactly the electric current that IREF holds like this; IMIN connects the resistance of 270K to ground, and when charging current reached IMIN, charging finished like this.VBAT end (positive pole of battery) is to deliver to baseband chip to do voltage detecting in the circuit, and software can be controlled its charging according to the current battery of mobile phone voltage that samples in the charging process like this.The circuit charging process of this scheme is as follows: after plugging charger, if the voltage that detects the VBAT end is less than 4.2V, at this moment will carry out constant current charge with the electric current of IREF end, when detecting cell voltage and be raised to 4.2V, enter the constant voltage mode charging, software reduces charging current gradually, and when charging current dropped to IMIN, charging was finished.
Referring to Fig. 2; Fig. 2 is the improvement part to Fig. 1 circuit; on the circuit of Fig. 1, increase by three components and parts; one 300 ohm resistance R 1; the clamp diode V2 of a protection diode V1 and a 4.2V; resistance R 1 is connected with the positive pole of protection diode V1; be connected in the charging circuit; one end of resistance R 1 is connected the input CHG_VIN of described cell-phone charging chip; input CHG_VIN connects the output of charger for mobile phone; the other end of resistance R 1 connects the positive pole of described protection diode V1; the negative pole of protection diode V1 is connected to the output VBAT of described cell-phone charging chip; output VBAT connects the input of battery of mobile phone, and the negative pole of clamp diode V2 is connected between resistance R 1 and the protection diode V1, its plus earth.The effect of resistance R 1 is to set the electric current of mobile phone when trickle, constant current and constant voltage charge, and formula is (U
CHG_VIN-U
VBAT)/300mA, the effect of protection diode V1 is to prevent that charger is unusual, the battery of mobile phone electric current can not flow to charger, is the protection to battery of mobile phone; Clamp diode V2 is when battery of mobile phone voltage reaches 4.2V, and the electric current of trickle charging circuit can pass through clamp diode V2 ground connection, makes the electric current of trickle charging circuit can not flow into battery of mobile phone again, is the protection of the battery of mobile phone when charging is finished.
When detecting battery of mobile phone voltage and be lower than 3.2V, CHG_CTRL is put height, the module of charging chip does not just provide and has not charged like this.The charging of this moment realizes trickle charge by the circuit improvement part of Fig. 2.The voltage of CHG_VIN end is 5V, and the voltage of VBAT end is smaller or equal to 3.2V, and this moment, the electric current of trickle charging circuit was (U
CHG_VIN-U
VBAT)/300mA carries out trickle charge to battery of mobile phone.When detecting cell voltage and reach 3.2V, CHG_CTRL is put low, so charging chip starts, provide the constant current charge electric current.This moment, trickle charging circuit still had (U
CHG_VIN-U
VBATThe electric current of)/300mA is to charging mobile phone battery, but charging is at this moment mainly provided by charging chip.The voltage that is full of electricity back battery reaches 4.2V; this moment clamp diode V2 the voltage clamp of battery of mobile phone at 4.2V; the electric current of trickle charging circuit flows to ground by clamp diode V2, and the trickle charging circuit no current flows into battery of mobile phone, and battery of mobile phone is protected.
Those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in claims scope of the present invention variation, the modification of above embodiment.
Claims (3)
1; a kind of trickle charging circuit of mobile phone; be applicable to cell-phone charging chip circuit with trickle charge function; comprise the charging chip circuit; it is characterized in that; also comprise resistance; protection diode and clamp diode; one end of described resistance is connected the input of described cell-phone charging chip; this input connects the output of charger for mobile phone; the other end of described resistance connects the positive pole of described protection diode; the negative pole of described protection diode is connected the output of described cell-phone charging chip; this output connects the input of battery of mobile phone, and the negative pole of described clamp diode is connected between described resistance and the protection diode, its plus earth.
2, trickle charging circuit as claimed in claim 1 is characterized in that, described clamp diode is the 4.2V clamp diode.
3, trickle charging circuit as claimed in claim 1 is characterized in that, the charging voltage of described charger for mobile phone is 5V, and described resistance is 300 ohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100470148A CN101505066A (en) | 2009-03-04 | 2009-03-04 | Trickle charging circuit for mobile phone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100470148A CN101505066A (en) | 2009-03-04 | 2009-03-04 | Trickle charging circuit for mobile phone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101505066A true CN101505066A (en) | 2009-08-12 |
Family
ID=40977204
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2009100470148A Pending CN101505066A (en) | 2009-03-04 | 2009-03-04 | Trickle charging circuit for mobile phone |
Country Status (1)
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| CN (1) | CN101505066A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102368637A (en) * | 2011-10-21 | 2012-03-07 | 安徽省电力公司六安供电公司 | Power acquisition device of high-voltage power transmission line |
| WO2012034481A1 (en) * | 2010-09-19 | 2012-03-22 | 华为终端有限公司 | Parallel battery pack |
| CN110912229A (en) * | 2019-11-28 | 2020-03-24 | 歌尔股份有限公司 | Trickle charging circuit, charger and electronic equipment |
-
2009
- 2009-03-04 CN CNA2009100470148A patent/CN101505066A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012034481A1 (en) * | 2010-09-19 | 2012-03-22 | 华为终端有限公司 | Parallel battery pack |
| CN102368637A (en) * | 2011-10-21 | 2012-03-07 | 安徽省电力公司六安供电公司 | Power acquisition device of high-voltage power transmission line |
| CN110912229A (en) * | 2019-11-28 | 2020-03-24 | 歌尔股份有限公司 | Trickle charging circuit, charger and electronic equipment |
| CN110912229B (en) * | 2019-11-28 | 2022-04-19 | 歌尔股份有限公司 | Trickle charging circuit, charger and electronic equipment |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20090812 |