CN104201748A - Intelligent charging circuit - Google Patents
Intelligent charging circuit Download PDFInfo
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- CN104201748A CN104201748A CN201410506912.6A CN201410506912A CN104201748A CN 104201748 A CN104201748 A CN 104201748A CN 201410506912 A CN201410506912 A CN 201410506912A CN 104201748 A CN104201748 A CN 104201748A
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Abstract
The invention provides an intelligent charging circuit. The intelligent charging circuit is characterized in that a mainframe is connected to the USB interface of a computer through a USB interface, and the working voltage of 5V/500 mA is provided through the USB interface of the computer; when the mainframe is in the power-on state, a system voltage provides a switch tube Q2 with a bias current, the switch tube Q2 is connected, a Q1 is stopped, and the charging current Ichg is 1000 V/R2, so that the mainframe is charged through a low current; when the mainframe is in the power-off state, the system voltage is 0, the switch tube Q2 is cut off, the Q1 is connected, a resistance R2 and a resistance R3 are connected to the ground, and the charging current Ichg is (1000 V/R3) + (1000 V/R2), so that the mainframe is charged through a high current. According to the invention, according to difference between the power-on and power-off states of the mainframe, the charging current is switched intelligently through a switch tube circuit, when the mainframe is powered on, the low current is adopted for charging, and when the mainframe is powered off, the high current is adopted for charging; compared with the prior art, the power-on and power-off states of the mainframe are adopted, and the mainframe is charged through switching the low current and high current automatically, so that the problems that the power consumption is increased due to power supply through the high current and the working temperature is boosted when the mainframe is in the power-on state can be avoided, and in addition, the problems that time is long and charging is insufficient due to charging through the low current when the mainframe is powered off can be solved.
Description
Technical field
The present invention relates to charging circuit, what be specifically related to is a kind of aptitude chargeable circuit, and it realizes its automated intelligent charging under startup and shutdown different conditions mainly for the electronic product of built-in lithium battery.
Background technology
The electronic product of now a lot of built-in lithium batteries is all with USB interface (such as mobile phone and panel computer etc.), this electronic product connects after computer by USB interface, can realize the data interaction between electronic product and computer on the one hand, charge can also on the other hand the built-in lithium battery of electronic product.
Yet because the USB mouth power output of computer is limited, be generally 5V/500mA, therefore in order to guarantee the normal work of electronic product and charging normal of lithium battery, be necessary the charging circuit of this product to be optimized design: when electronic product is in open state and while connecting computer USB, the output of computer USB interface power supply will preferentially guarantee the normal work of electronic product, is secondly to adopt little current system to charge at a slow speed to lithium battery; And when electronic product is in off-mode and while being connected to computer USB, need to adopt large current system to carry out quick charge to electronic product built-in lithium battery.
But some electronic product is not considered the problems referred to above when design: during this electronic product work, still adopt large current system charging, easily cause product power consumption to increase, working temperature raises; Or after electronic product shutdown, still adopt little current system charging, cause the charging interval long or be not fully filled electricity.
Summary of the invention
For this reason, the object of the present invention is to provide a kind of aptitude chargeable circuit, while connecting the work of computer USB mouth to solve existing electronic product, adopt large current system charging, easily cause product power consumption to increase, the problem that working temperature raises; Simultaneously the present invention still adopts little current system charging after also having solved electronic product shutdown, causes the charging interval long or be not fully filled electric problem.
The object of the invention is to be achieved through the following technical solutions.
An aptitude chargeable circuit, comprising:
One USB interface J1, is connected with computer USB interface, for the operating voltage of 5V/500mA is provided;
One power supply chip U1, its input is connected with USB interface J1 by interrupteur SW 1, output connects equivalent host work load R1, and this power supply chip U1 is for the operating voltage of above-mentioned 5V/500mA is changed, and output is applicable to the system voltage Vsys of host work;
One charging chip, the pin PROG that it includes the input being connected with USB interface J1, the pin BAT being connected with lithium battery and sets charging current, described pin BAT output current Ichg is to lithium battery; Described pin PROG is output as two-way, leads up to resistance R 2 ground connection, and the resistance R 3 of leading up to is connected with switching tube Q1; Described charging chip is set charging current according to formula Ichg=1000V/RPROG, wherein the resistance of RPROG for being connected over the ground with pin PROG;
One charging current regulating circuit, includes resistance R 4, R5, R6, R7, R8 and switching tube Q2, and the collector electrode of described switching tube Q2 is divided into two-way, and the resistance R 5 of leading up to is connected with switching tube Q1, and a road connects draws resistance R 6; Resistance R 4 one end are connected between switching tube Q1 and resistance R 5, other end ground connection; Described switching tube Q2 grounded emitter, its base stage is divided into two-way, leads up to resistance R 7 ground connection, and a road is connected with resistance R 8;
Wherein, when main frame is started shooting, switching tube Q1 cut-off, charging current Ichg=1000V/R2; When main frame shuts down, switching tube Q1 conducting, charging current Ichg=(1000V/R2)+(1000V/R3).
Further, when interrupteur SW 1 is connected, power supply chip U1 is the system voltage Vsys for applicable host work by 5V voltage transitions, the normal work of now main frame start; Meanwhile, system voltage Vsys is after resistance R 7, R8 dividing potential drop, and for switching tube, Q2 provides bias current, now Q2 conducting, and its collector electrode becomes low level from high level, Q1 cut-off, charging current Ichg=1000V/R2.
Further, when interrupteur SW 1 is turn-offed, system voltage Vsys=0V, main frame is in off-mode; Meanwhile, switching tube Q2 Vbe=0V, Q2 only carries, and its current collection is high level very; 5V voltage is after R6, R5, R4 dividing potential drop, and for switching tube Q1 provides G pole tension, now Q1 conducting, resistance R 3 is by Q1 ground connection, charging current Ichg=(1000V/R3)+(1000V/R2).
Further, described switching tube Q2 is NPN type triode.
Further, described switching tube Q1 is N-type metal-oxide-semiconductor.
The present invention also provides a kind of electric terminal equipment, comprises above-mentioned aptitude chargeable circuit, and is connected with computer USB interface by USB interface J1.
Main frame of the present invention is connected to computer USB interface by USB interface, and the operating voltage of 5V/500mA is provided by computer USB interface; When main frame is during in open state, system voltage provides bias current for switching tube Q2, switching tube Q2 conducting, and Q1 cut-off, charging current Ichg=1000V/R2, thus realize the low current charge to main frame; When main frame is during in off-mode, system voltage is 0, switching tube Q2 cut-off, Q1 conducting, resistance R 2, the equal ground connection of R3, now charging current Ichg=(1000V/R3)+(1000V/R2), thus realize the large current charge to main frame.The present invention is different according to the on-off state of main frame, utilizes switching tube circuit to realize intelligence and switches charging current, when main frame is started shooting, adopts little electric current power supply; When main frame shuts down, adopt large electric current power supply.Compared with prior art, the present invention adopts Host Status different, and the mode of automatic switchover current to main frame charging, has avoided under main frame open state, and large current charge causes power consumption to increase, the problem that working temperature raises; Low current charge, the problem of long and undercharge consuming time have been solved after main frame shutdown simultaneously.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of aptitude chargeable circuit of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Refer to shown in Fig. 1 the circuit theory diagrams that Fig. 1 is aptitude chargeable circuit of the present invention.Circuit of the present invention is mainly for being built-in with lithium battery and having the main frame of USB interface, when it is connected with computer USB interface, according to corresponding slow, the charging quickly of realizing main frame of the on-off state of main frame.
The present embodiment circuit is built in main frame (electronic terminal product), when main frame is in open state and while connecting computer USB, computer USB power supply needs the preferential normal work that guarantees main frame, secondly adopt little current system to charge at a slow speed to lithium battery, corresponding the adding up of heat when preventing that heat that large electric current quick charge produces from normally working with main frame, causes the device aging acceleration problem such as main frame inside mainboard; When main frame is during in off-mode, this circuit adopts large current system to carry out quick charge to lithium battery, due to main frame shutdown, therefore can now can not select large electric current quick charge because work produces heat, improves charge efficiency.
By reference to the accompanying drawings 1, the USB interface that wherein J1 is main frame, it is corresponding is connected with computer USB interface, for the operating voltage of 5V/500mA is provided.
U1 is power supply chip, operating voltage for 5V/500mA that J1 is provided is converted to the system voltage Vsys that is applicable to host work, its input VIN is connected with USB interface J1 by interrupteur SW 1, GND ground connection, output VOUT is connected to resistance R 1, and the system voltage Vsys of the applicable host work of corresponding output, wherein R1 is equivalent to host work load.
U2 is charging chip, the pin PROG that includes the input VIN being connected with USB interface J1, the pin BAT being connected with lithium battery, earth terminal GND and set charging current.Wherein pin BAT output current Ichg is to lithium battery Li-Ion; Pin PROG is output as two-way, leads up to resistance R 2 ground connection, and the resistance R 3 of leading up to is connected with switching tube Q1; U2 is for setting charging current by pin PROG, and it sets charging current according to formula Ichg=1000V/RPROG, and wherein RPROG is resistance R 2, the R3 being connected with pin PROG.
Resistance R 4, R5, R6, R7, R8 and switching tube Q2 form charging current regulating circuit, for the break-make of control switch pipe Q1, thereby reach the object that regulates charging current.The collector electrode of switching tube Q2 is divided into two-way, and the resistance R 5 of leading up to is connected with switching tube Q1, a road connecting resistance R6, and resistance R 6 connects 5V voltage; Resistance R 4 one end are connected between switching tube Q1 and resistance R 5, other end ground connection; Described switching tube Q2 grounded emitter, its base stage is divided into two-way, leads up to resistance R 7 ground connection, and a road is connected with resistance R 8, resistance R 8 connecting system voltage Vsys, corresponding export with UI consistent of this system voltage Vsys.
The charging current of circuit of the present invention is set by the resistance R 2, the R3 that are connected with U2 pin PROG.When USB interface J1 is connected to computer, USB, for product provides the operating voltage of 5V/500mA, gives charging chip U2 power supply, for lithium battery provides charging current simultaneously.
If interrupteur SW 1 is connected, U1 is by 5V voltage transitions for being applicable to the system voltage Vsys of host work, and main frame starts normal work; Meanwhile, Vsys is after R7, R8 dividing potential drop, and for switching tube, Q2 provides bias current, now Q2 conducting, and its collector electrode becomes low level from the high level of 5V left and right; Because Q1 is N-type metal-oxide-semiconductor, and VGS=0V now, Q1 cut-off.According to charging current, set formula, charging current is now Ichg=1000V/R2, is now low current charge.
If interrupteur SW 1 is turn-offed, VSYS=0V, main frame is outer in off-mode; Meanwhile, triode Q2 Vbe=0V, Q2 only carries, and its current collection is high level very; 5V voltage after R4, R5, R6 dividing potential drop, for Q1 provides G pole tension, because VGS is high level, Q1 conducting, resistance R 3 meets GND by Q1.According to charging current, set formula, charging current Ichg=(1000V/R3 now)+(1000V/R2), be now large current charge,
In sum, the break-make that the present invention realizes switching tube by the on-off state of main frame is controlled, and when main frame start work, Q1 only carries, and charging current is Ichg=1000V/R2, realizes the little electric current trickle charge to main frame; When main frame shuts down, Q1 conducting, charging current is Ichg=(1000V/R2)+(1000V/R3), realize the large electric current of main frame is filled soon.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (6)
1. an aptitude chargeable circuit, is characterized in that, comprising:
One USB interface J1, is connected with computer USB interface, for the operating voltage of 5V/500mA is provided;
One power supply chip U1, its input is connected with USB interface J1 by interrupteur SW 1, output connects equivalent host work load R1, and this power supply chip U1 is for the operating voltage of above-mentioned 5V/500mA is changed, and output is applicable to the system voltage Vsys of host work;
One charging chip, the pin PROG that it includes the input being connected with USB interface J1, the pin BAT being connected with lithium battery and sets charging current, described pin BAT output current Ichg is to lithium battery; Described pin PROG is output as two-way, leads up to resistance R 2 ground connection, and the resistance R 3 of leading up to is connected with switching tube Q1; Described charging chip is set charging current according to formula Ichg=1000V/RPROG, wherein the resistance of RPROG for being connected over the ground with pin PROG;
One charging current regulating circuit, includes resistance R 4, R5, R6, R7, R8 and switching tube Q2, and the collector electrode of described switching tube Q2 is divided into two-way, and the resistance R 5 of leading up to is connected with switching tube Q1, and a road connects draws resistance R 6; Resistance R 4 one end are connected between switching tube Q1 and resistance R 5, other end ground connection; Described switching tube Q2 grounded emitter, its base stage is divided into two-way, leads up to resistance R 7 ground connection, and a road is connected with resistance R 8;
Wherein, when main frame is started shooting, switching tube Q1 cut-off, charging current Ichg=1000V/R2; When main frame shuts down, switching tube Q1 conducting, charging current Ichg=(1000V/R2)+(1000V/R3).
2. aptitude chargeable circuit as claimed in claim 1, is characterized in that, when interrupteur SW 1 is connected, power supply chip U1 is the system voltage Vsys for applicable host work by 5V voltage transitions, the normal work of now main frame start; Meanwhile, system voltage Vsys is after resistance R 7, R8 dividing potential drop, and for switching tube, Q2 provides bias current, now Q2 conducting, and its collector electrode becomes low level from high level, Q1 cut-off, charging current Ichg=1000V/R2.
3. aptitude chargeable circuit as claimed in claim 1, is characterized in that, when interrupteur SW 1 is turn-offed, and system voltage Vsys=0V, main frame is in off-mode; Meanwhile, switching tube Q2 Vbe=0V, Q2 only carries, and its current collection is high level very; 5V voltage is after R6, R5, R4 dividing potential drop, and for switching tube Q1 provides G pole tension, now Q1 conducting, resistance R 3 meets GND by Q1, charging current Ichg=(1000V/R3)+(1000V/R2).
4. aptitude chargeable circuit as claimed in claim 3, is characterized in that, described switching tube Q2 is NPN type triode.
5. aptitude chargeable circuit as claimed in claim 3, is characterized in that, described switching tube Q1 is N-type metal-oxide-semiconductor.
6. an electric terminal equipment, is characterized in that, comprises the aptitude chargeable circuit as described in claim 1 ~ 5, and is connected with computer USB interface by USB interface J1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410506912.6A CN104201748A (en) | 2014-09-28 | 2014-09-28 | Intelligent charging circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410506912.6A CN104201748A (en) | 2014-09-28 | 2014-09-28 | Intelligent charging circuit |
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| CN104201748A true CN104201748A (en) | 2014-12-10 |
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| CN201410506912.6A Pending CN104201748A (en) | 2014-09-28 | 2014-09-28 | Intelligent charging circuit |
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Cited By (4)
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| CN104882941A (en) * | 2015-06-12 | 2015-09-02 | 联想(北京)有限公司 | Electronic equipment, and control method therefor |
| CN109528235A (en) * | 2018-11-16 | 2019-03-29 | 中聚科技股份有限公司 | A kind of wireless Multi probe fetal heart monitoring system of intelligent power supply and power-off |
| CN110504729A (en) * | 2019-09-02 | 2019-11-26 | 宁波唯嘉软件科技有限公司 | A kind of lithium battery power supply method, storage medium, device |
| CN113131539A (en) * | 2019-12-30 | 2021-07-16 | Tcl新技术（惠州）有限公司 | Terminal charging circuit and method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104882941A (en) * | 2015-06-12 | 2015-09-02 | 联想(北京)有限公司 | Electronic equipment, and control method therefor |
| CN109528235A (en) * | 2018-11-16 | 2019-03-29 | 中聚科技股份有限公司 | A kind of wireless Multi probe fetal heart monitoring system of intelligent power supply and power-off |
| CN109528235B (en) * | 2018-11-16 | 2021-07-13 | 中聚科技股份有限公司 | Wireless multi-probe fetal heart monitoring system with intelligent power supply and power failure functions |
| CN110504729A (en) * | 2019-09-02 | 2019-11-26 | 宁波唯嘉软件科技有限公司 | A kind of lithium battery power supply method, storage medium, device |
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| CN113131539A (en) * | 2019-12-30 | 2021-07-16 | Tcl新技术（惠州）有限公司 | Terminal charging circuit and method |
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Application publication date: 20141210 |