CN102468657B - Charging circuit of standby battery - Google Patents
Charging circuit of standby battery Download PDFInfo
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- CN102468657B CN102468657B CN201010538507.4A CN201010538507A CN102468657B CN 102468657 B CN102468657 B CN 102468657B CN 201010538507 A CN201010538507 A CN 201010538507A CN 102468657 B CN102468657 B CN 102468657B
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Abstract
The invention discloses a charging circuit of a standby battery, and the standby battery can be used for charging a main battery of a mobile terminal. The charging circuit of the standby battery comprises a booster circuit, a control circuit, a booster circuit controller and an enable control circuit, wherein the booster circuit is connected between the standby battery and the main battery, and is used for boosting the voltage of the standby battery to the voltage required by the main battery; and the control circuit is connected with the standby battery, the booster circuit and the main battery, is used for controlling the working state of the booster circuit according to the voltage states of the standby battery and the main battery, and outputting the working index signal. The booster circuit controller is connected with the standby battery and the booster circuit, and when the main battery is in discharge protection, the control circuit does not work and the standby battery is sufficiently charged, the booster circuit controller is used for removing a discharge protection circuit of the main battery. The enable control circuit is connected with the standby battery, the booster circuit controller and the control circuit, and is used for controlling the working state of the booster circuit controller according to the working index signal.
Description
Technical field
The invention belongs to mobile phone energy field, be applied to solution emergency service, in the electronic product of prolongs standby time, air time.
Background technology
At mobile phone energy field, there is multiple solution emergency service problem, extend standby, the scheme of air time.When mobile phone electric weight deficiency, carry charger or non-transformer or meet in the absence that power failure etc. cannot charge out of doors, how immediately solving mobile phone quantity problem, using AAA reserve battery portable and that be available anywhere is exactly one of scheme to carrying out mobile phone charging.
As shown in Figure 1, traditional AAA charging circuit of stand-by battery is comprised of AAA reserve battery 110, booster circuit 120, control circuit 130,140 4 square frames of lithium battery.Wherein, AAA reserve battery 110 is for generation of the energy of mobile phone charging.The lower direct voltage of booster circuit 120 for AAA reserve battery 110 is provided, rises to the required charging voltage of lithium battery 140.Control circuit 130 not only can detect input, ensures stable input, can also detect the lithium battery of output 140 voltages, thereby ensure that lithium battery 140 can not overcharge; Simultaneously, control circuit 130 is charge mode, control charging current, the charge efficiency that improves of changeable lithium battery 140 also, can also detect lithium battery 140 and whether by other charger charging, its voltage, whether lower than set point, user, whether be required to use above-mentioned AAA reserve battery 110 charge functions, finally, according to various result of determination and requirements set, automatically open or charge closing function.Here, lithium battery 140 is main batterys of mobile phone, is the energy provider of cell phone system, and meanwhile, it is also for providing power supply to control circuit 130.
In traditional design, for the stability and the efficiency that ensure that control circuit 130 is worked, when in AAA reserve battery 110 or lithium battery 140, any one voltage is lower than predetermined value, control circuit 130 is not worked, booster circuit 120 also cannot be worked, and whole charging circuit can not charge again.
If lithium battery 140 continuous discharges are to discharge prevention; the voltage of lithium battery 140 is 0V; now; control circuit 130 can not start; booster circuit 120 also just also cannot be worked so, and no matter the electric weight of AAA reserve battery 110 has muchly, charge all cannot to lithium battery 140; emergency service problem be cannot solve, standby, air time extended.
Summary of the invention
In view of this, charging circuit of stand-by battery provided by the present invention can, after mobile terminal main battery discharge prevention, still can charge to described main battery with reserve battery, user-friendly.
Charging circuit of stand-by battery of the present invention comprises, by reserve battery, to the main battery of mobile terminal, charges, and it comprises booster circuit, control circuit, booster circuit controller and enables control circuit.Wherein, booster circuit is connected between reserve battery and main battery, for by the boost in voltage of reserve battery to the needed voltage of main battery.Control circuit connects reserve battery, booster circuit and main battery, for according to the operating state of the voltage status control booster circuit of reserve battery and main battery, and output services index signal.Booster circuit controller is connected with reserve battery and booster circuit, for not working when main battery discharge prevention, control circuit and when reserve battery electric weight is sufficient, removing the discharge protection circuit of main battery.Enable control circuit and be connected with reserve battery, booster circuit controller and control circuit, for according to the operating state of work index signal control booster circuit controller.
Above-mentioned charging circuit of stand-by battery, wherein: described reserve battery is AAA battery, and described main battery is lithium battery.
Above-mentioned charging circuit of stand-by battery, wherein: described booster circuit controller is consisted of reference voltage source, oscillating circuit, comparator, control circuit, described booster circuit controller has the pin of enabling, and described control circuit is pulse frequency modulated control circuit.
Above-mentioned charging circuit of stand-by battery, described in enable control circuit and comprise: pull-up resistor, is connected in the positive pole of described reserve battery and enabling between pin of booster circuit controller, for guaranteeing the normal work of described booster circuit controller; Electric capacity, is connected in described booster circuit controller and enables between pin and described reserve battery negative pole, and itself and described pull-up resistor form delay circuit, for guaranteeing the stable of described booster circuit controller operating state; Chip, its first pin is connected in the pin that enables of described booster circuit controller, its the second pin connects the positive pole of described reserve battery, and the 3rd pin connects the negative pole of described reserve battery, when guaranteeing that backup battery voltage is greater than preset value described in booster circuit controller just can work; Described chip is voltage checking chip, and described the first pin is reset pin, and described the second pin is power supply input pin, and described the 3rd pin is grounding pin; And electric crystal, its control end is connected with described control circuit, and for receiving described work index signal, its first output connects described reserve battery negative pole, and its second output connects the Enable Pin of described booster circuit controller; Wherein, when described control circuit is normally worked, described work index signal is high level, described electric crystal conducting, and the pin that enables of described booster circuit controller is dragged down, therefore described booster circuit controller is not worked.
Charging circuit of stand-by battery of the present invention can solve after lithium battery discharge prevention, and booster circuit controller is removed the discharge prevention of lithium battery, makes the reserve battery can be to the problem of lithium cell charging, safe and reliable, and has higher performance and efficiency.
Accompanying drawing explanation
For ease of explanation, the present invention is described in detail by following preferred embodiment and accompanying drawing.
Figure 1 shows that the block diagram of traditional AAA charging circuit of stand-by battery.
Figure 2 shows that the block diagram of charging circuit of stand-by battery in the present invention.
Figure 3 shows that the physical circuit figure of Fig. 2 of the present invention.
Embodiment
Figure 2 shows that the block diagram of charging circuit of stand-by battery of the present invention, it can use reserve battery 210 to charge to the main battery 240 of mobile terminal, and it is by booster circuit 220, control circuit 230, booster circuit controller 250 and enable control circuit 260 and form.In present embodiment, reserve battery 210 is AAA dry cell, in other execution modes, and also other types and facilitate available battery.Mobile terminal main battery 240 is lithium battery.Wherein, reserve battery 210, booster circuit 220, control circuit 230, lithium battery 240 function square frames are the same with square frame corresponding in AAA charging circuit of stand-by battery traditional in Fig. 1,, booster circuit 220 is connected between reserve battery 210 and lithium battery 240, for by the boost in voltage of reserve battery 210 to the needed voltage of main battery 240; Control circuit connects reserve battery 210, booster circuit 220 and lithium battery 240, for according to the operating state of the voltage status control booster circuit 220 of reserve battery 210 and lithium battery 240.
In present embodiment; booster circuit controller 250 is all connected with reserve battery 210, booster circuit 220, for, being powered by reserve battery 210 during discharge prevention at lithium battery 240; export a high level, remove the discharge protection circuit of lithium battery 240 inside and charge to lithium battery 240.When the voltage at lithium battery 240 two ends is during higher than the required voltage of control circuit 230, control circuit 230 is started working.Enabling control circuit 260 is all connected with reserve battery 210, booster circuit controller 250, control circuit 230, for simply enabling to 250 1 of booster circuit controllers, control, guarantee that he works in reserve battery 210 electric weight abundances and the idle situation of control circuit 230.
Consult Fig. 3, its physical circuit figure that is Fig. 2 of the present invention simultaneously.It should be noted that V
aLK+port connects the positive pole of reserve battery 210, and earth terminal T1 connects the negative pole of reserve battery 210, V
bATport connects the positive pole of lithium battery 240, and earth terminal T2 connects the negative pole of lithium battery 240.In present embodiment, inductance L 1, diode D1, the first transistor Q1, the second electric crystal Q2 form booster circuit 220, and chip U1 is the control chip that reserve battery 210 charges to lithium battery 240, forms control circuit 230 function square frames.Capacitor C 1, C2 are V
bATthe filter capacitor of port.Resistance R 2 connects between earth terminal T1 and T2.Chip U2 is a kind of booster circuit controller 250 function square frames that consist of reference voltage source, oscillating circuit, comparator, control circuit etc.Resistance R 1, capacitor C 3, chip U3 and the 3rd electric crystal Q3A formation enable control circuit 260 function square frames, for the control that enables to booster circuit controller 250.
V
aLK+port, inductance L 1, diode D1, the first electric crystal Q1, the second electric crystal Q2, chip U1, capacitor C 1, C2, V
bATport is traditional charging circuit of stand-by battery, and it has completed from reserve battery 210 boost in voltage and has outputed to lithium battery 240, and by detecting and charging with controlling and charge to lithium battery 240.The charging that chip U1 controls lithium battery 240 whether, charge mode and charging current.When lithium battery 240 voltages are 0V, chip U1 power supply is 0V, cannot work.
In present embodiment; what chip U2 selected is the chip of S-8351A33MC model; it is a kind of CMOS booster circuit controller 250 consisting of reference voltage source, oscillating circuit, comparator, pulse frequency modulated control circuit etc.; can be according to the load occupation efficiency that automatically switches; and built-in MOSFET is used protective circuit; meeting auto-cutout when exceeding controlling value, to prevent destruction.Therefore, can obtain the fail safe of low ripple, high efficiency and safeguards system circuit in a big way.Consider, function, performance, fail safe can reach also can select other device.
Chip U2 and booster circuit 220 have shared V
aLK+port, inductance L 1, diode D1, capacitor C 1, C2, V
bATport part, has completed from reserve battery 210 boost in voltage output 3.3V to lithium battery 240.
The first pin of chip U2 is to enable pin, and it is that high level triggers, that is, chip U2 work during high level, during low level, chip U2 does not work, and like this, chip U2 can control to lithium battery 240 the output 3.3V that whether boosts.
As mentioned above, enable control circuit 260 and comprise resistance R 1, capacitor C 3, chip U3 and the 3rd electric crystal Q3A.Resistance R 1 is the pull-up resistor that enables pin, is connected in V
aLK+port and chip U2 enable between pin, and to confirm all do not have in harness situation at other control circuit, this enables pin is high level, and chip U2 normally works.Capacitor C 3 is connected in earth terminal T1 and chip U2 enables between pin, guarantee the stable of chip U2 operating state, itself and resistance R 1 form delay circuit, when drawing in resistance R 1, can not allow immediately enable pin and become high level, make it have a time delay, delay time t=R1*C3, to guarantee the stable of chip U2 operating state, prevent shake.Simultaneously in order to guarantee after the protection of activating lithium battery 240; can charge effectively to lithium battery 240; must guarantee that the electric weight of reserve battery 210 can not be too low; otherwise lithium battery 240 there will be continuous discharge prevention to activate; discharge prevention again; reactivation ... circulation, the life-span of lithium battery 240 is had to impact.
Chip U3 is high-precision voltage checking chip, and its first pin is connected in the pin that enables of chip U2, and its second pin connects V
aLK+port, its 3rd pin connects earth terminal T1, and effect is that while guaranteeing that reserve battery 210 voltages are greater than certain value, chip U2 just can work, and just understands the protection of activating lithium battery 240 and charges to lithium battery 240.
In present embodiment, we select chip U3 is the chip of S-80811CNPF model, and detecting voltage is 1.1V, and precision is+-2%.When reserve battery 210 voltages are greater than 1.1V, when the second pin of chip U3 is greater than 1.1V, chip U2 just starts working, and in the situation that meeting its function, chip U2 also can select other device.
When lithium battery 240 voltages are during higher than the threshold voltage of chip U1, chip U1 can work, now, and by V
aLK+port, inductance L 1, diode D1, the first electric crystal Q1, the second electric crystal Q2, resistance R 14, capacitor C 1, C2, V
bATport completes the reserve battery 210 charging work to lithium battery 240, and meanwhile, chip U1 can export a high level work index signal, should close by chip U2, V
aLK+port, inductance L 1, diode D1, resistance R 14, capacitor C 1, C2, V
bATthe output of boosting that port forms.Otherwise when lithium battery 240 voltages are during lower than the threshold voltage of chip U1, chip U1 does not work, chip U1 exports a low level work index signal.
In present embodiment, electric crystal Q3A control end is connected with chip U1, and for receiving work index signal, its first output connects earth terminal T1, and its second output connects the Enable Pin of chip U2.When chip U1 works, the work index signal of its output high level, electric crystal Q3A conducting, the first pin of chip U2 is dragged down, and chip U2 does not work, thereby guarantees to close by chip U2, V
aLK+port, inductance L 1, diode D1, resistance R 14, capacitor C 1, C2, V
bATthe output of boosting that port forms.When chip U1 does not work, the work index signal of its output low level, not conducting of electric crystal Q3A, the state of the first pin of chip U2 is determined by resistance R 1, chip U3, capacitor C 3.Visible, enable control circuit 260 and can guarantee that booster circuit controller 250 normally works in the idle situation of control circuit 230, thereby guarantee the normal work of whole charging circuit.
In sum; charging circuit of stand-by battery of the present invention can solve after lithium battery 240 discharge preventions, and booster circuit controller 250 is removed the discharge prevention of lithium battery 240, the problem that reserve battery 210 can be charged to lithium battery 240; safe and reliable, and there is higher performance and efficiency.
The embodiment of the above is the preferred embodiments of invention, not with this, limits specific embodiment of the invention scope, and scope of the present invention comprises and is not limited to this embodiment.The equivalence variation that all shapes according to the present invention, structure are done all comprises in protection scope of the present invention.
Claims (4)
1. a charging circuit of stand-by battery, charges to the main battery of mobile terminal by reserve battery, it is characterized in that, described charging circuit of stand-by battery comprises:
Booster circuit, is connected between described reserve battery and main battery, for by the boost in voltage of described reserve battery to the needed voltage of described main battery;
Control circuit, connects described reserve battery, booster circuit and main battery, for according to the operating state of booster circuit described in the voltage status control of described reserve battery and main battery, and output services index signal;
Booster circuit controller, is connected with described reserve battery and booster circuit, for not working when described main battery discharge prevention, control circuit and removing the discharge protection circuit of described main battery when described reserve battery electric weight is sufficient; And
Enable control circuit, be connected with described reserve battery, booster circuit controller and control circuit, for according to the operating state of booster circuit controller described in the control of described work index signal; Concrete control mode comprises:
Described control circuit connects main battery, by main battery, is powered; When discharge prevention of main battery, while making main battery voltage lower than the power supply threshold voltage of control circuit, described control circuit is not worked, and exports a low level work index signal, described in enable control circuit and according to described low level work index signal, booster circuit controller can be worked;
Now main battery do not work by discharge prevention, control circuit, when in the situation of reserve battery electric weight abundance, described booster circuit controller is powered by reserve battery, booster circuit controller output signal to be to remove the discharge protection circuit of main battery inside, and booster circuit controller charges to main battery after reserve battery is boosted;
When the voltage of main battery is during higher than the required power supply threshold voltage of control circuit, described control circuit is started working, and control booster circuit by the reserve battery backward main battery charging of boosting, export a high level work index signal simultaneously, the described control circuit that enables, according to described high level work index signal, can not work booster circuit controller.
2. charging circuit of stand-by battery as claimed in claim 1, is characterized in that, described reserve battery is AAA battery, and described main battery is lithium battery.
3. charging circuit of stand-by battery as claimed in claim 1, is characterized in that, described booster circuit controller is consisted of reference voltage source, oscillating circuit, comparator, pulse frequency modulated control circuit, and described booster circuit controller has the pin of enabling.
4. charging circuit of stand-by battery as claimed in claim 3, is characterized in that, described in enable control circuit and comprise:
Pull-up resistor, is connected in the positive pole of described reserve battery and enabling between pin of booster circuit controller, for guaranteeing the normal work of described booster circuit controller;
Electric capacity, is connected in described booster circuit controller and enables between pin and described reserve battery negative pole, and itself and described pull-up resistor form delay circuit, for guaranteeing the stable of described booster circuit controller operating state;
Chip, its first pin is connected in the pin that enables of described booster circuit controller, its the second pin connects the positive pole of described reserve battery, and the 3rd pin connects the negative pole of described reserve battery, when guaranteeing that backup battery voltage is greater than preset value described in booster circuit controller just can work; Described chip is voltage checking chip, and described the first pin is reset pin, and described the second pin is power supply input pin, and described the 3rd pin is grounding pin; And
Electric crystal, its control end is connected with described control circuit, and for receiving described work index signal, its first output connects described reserve battery negative pole, and its second output connects the Enable Pin of described booster circuit controller;
Wherein, when described control circuit is normally worked, described work index signal is high level, described electric crystal conducting, and the pin that enables of described booster circuit controller is dragged down, therefore described booster circuit controller is not worked.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010538507.4A CN102468657B (en) | 2010-11-09 | 2010-11-09 | Charging circuit of standby battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010538507.4A CN102468657B (en) | 2010-11-09 | 2010-11-09 | Charging circuit of standby battery |
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| CN102468657A CN102468657A (en) | 2012-05-23 |
| CN102468657B true CN102468657B (en) | 2014-04-23 |
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| CN201010538507.4A Active CN102468657B (en) | 2010-11-09 | 2010-11-09 | Charging circuit of standby battery |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104505551B (en) * | 2014-12-15 | 2017-06-30 | 广东欧珀移动通信有限公司 | A kind of charging circuit of charging method and wearable device |
| CN104748869A (en) * | 2015-03-31 | 2015-07-01 | 无锡市崇安区科技创业服务中心 | Community environment temperature real-time monitoring system with node power supply optimizing effect |
| FR3068533B1 (en) * | 2017-06-30 | 2019-07-26 | Continental Automotive France | SYSTEM AND METHOD FOR MANAGING THE EMERGENCY BATTERY FOR AN EMERGENCY CALL DEVICE |
| CN107942260A (en) * | 2017-12-11 | 2018-04-20 | 上海木爷机器人技术有限公司 | A kind of control method and system of battery charging and discharging test |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1734826A (en) * | 2005-06-30 | 2006-02-15 | 上海贝豪通讯电子有限公司 | Method for improving battery availability factor |
| CN101834319A (en) * | 2010-03-10 | 2010-09-15 | 青岛海信电器股份有限公司 | Power supply management method and device and electronic equipment |
| CN201877851U (en) * | 2010-11-09 | 2011-06-22 | 福兴达科技实业（深圳）有限公司 | Charging circuit of stand-by battery |
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- 2010-11-09 CN CN201010538507.4A patent/CN102468657B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1734826A (en) * | 2005-06-30 | 2006-02-15 | 上海贝豪通讯电子有限公司 | Method for improving battery availability factor |
| CN101834319A (en) * | 2010-03-10 | 2010-09-15 | 青岛海信电器股份有限公司 | Power supply management method and device and electronic equipment |
| CN201877851U (en) * | 2010-11-09 | 2011-06-22 | 福兴达科技实业（深圳）有限公司 | Charging circuit of stand-by battery |
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Effective date of registration: 20200602 Address after: 518000 room 304, 3 / F, Fuxing building, 6 Binglang Road, Fubao community, Futian District, Shenzhen City, Guangdong Province Patentee after: Shenzhen Jinxuan Technology Co.,Ltd. Address before: 518038 areca road in Guangdong Province, Shenzhen Futian Free Trade Zone No. 6 Fuxing Building 4 floor Patentee before: SHENZHEN FUZHI SOFTWARE TECHNOLOGY Co.,Ltd. |