CN1564421A - Charger for lithium cell - Google Patents
Charger for lithium cell Download PDFInfo
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- CN1564421A CN1564421A CNA2004100264970A CN200410026497A CN1564421A CN 1564421 A CN1564421 A CN 1564421A CN A2004100264970 A CNA2004100264970 A CN A2004100264970A CN 200410026497 A CN200410026497 A CN 200410026497A CN 1564421 A CN1564421 A CN 1564421A
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Abstract
First rectification filter circuit converts AC electric supply to DC supply, and pulse-width modulation circuit converts DC supply to AC in high frequency, which is coupled to secondary side by transformer. With the coupled AC being treated, second rectification filter circuit supplies current and voltage needed by charging rechargeable battery. Special combination of circuit of testing constant current, circuit of testing constant voltage, and pulse-width modulation circuit controls constant current and constant voltage. Advantages are: function of constant current and constant voltage, wide range of input voltage, protection of output short circuit, function of preventing reversed current from battery etc. suitable to PDA camera etc.
Description
Technical field
The present invention relates to the charger technical field, relate in particular to a kind of charger that can charge to lithium battery.
Background technology
Volume is little, in light weight, self-discharge rate is low, the advantage of memory-less effect because the common relatively nickel-cadmium/nickel-hydrogen cell of chargeable lithium cell has, be used in widely in a lot of novel mobile devices, progressively substituted by lithium battery as the battery of mobile devices such as the usual mobile phone that uses, notebook computer, PDA.If but lithium battery seriously overcharges or super-large current discharges and recharges dangerous situations such as might causing blast, burning, therefore, the instructions for use of lithium battery is than higher, overcharge with overdischarge to the extent of damage of battery all than nickel-cadmium/nickel-hydrogen cell severity, so also just the charger of lithium battery is had higher requirement.
The charging modes of general Ni-MH battery is a constant current charge; the charging requirement mode of lithium ion battery and Ni-MH battery is inequality; along with being full of of electric weight; lithium battery voltage can slowly raise; this also is a sign of judging whether lithium battery is full of, and the pressure-limit current-limit method is generally adopted in the charging of lithium battery, and the charging modes of lithium battery is: first constant current charge; when reaching the li-ion cell protection upper voltage limit, must be converted into constant voltage charging method.Lithium battery charger in the market exists following shortcoming:
Input voltage range when 1, charging is narrow, can't be suitable for the voltage range that All Countries adopts;
2, constant pressure and flow inaccuracy, the charging current voltage fluctuation is big, the easy like this damage that causes battery;
3, there is the anti-electric current of irritating after the battery charge, causes battery to be full of discharge again behind the electricity;
4, charging indication (commentaries on classics lamp) circuit complexity, the cost height;
5, the charging current during short circuit is greater than continuous current, easy like this charger caused damage;
6, when the output connection material, because the impedance of wire rod can produce pressure drop and make charging voltage drop, the inaccuracy when so also causing constant voltage charge.
Summary of the invention
Technical problem to be solved by this invention is: overcome deficiencies such as existing lithium battery charger input voltage range is narrow, constant pressure and flow inaccuracy, the anti-filling of existence electric current, charging indication complexity, a kind of lithium battery charger is provided, but make the input voltage range global general-use, and make constant voltage constant current charging accurate, do not have the anti-electric current of irritating, and simplify charging indication.
The present invention solves the problems of the technologies described above the technical scheme that is adopted to be:
This lithium battery charger comprises first current rectifying and wave filtering circuit, pulse-width modulation circuit, transformer, second current rectifying and wave filtering circuit, constant current testing circuit and constant voltage testing circuit;
Become direct current after the ac process of described first current rectifying and wave filtering circuit with the civil power input, import described pulse-width modulation circuit again, this direct current is become high-frequency alternating current, high-frequency alternating current is by described transformer coupled to time utmost point, after described second current rectifying and wave filtering circuit is handled, provide the rechargable battery charging required current/voltage again;
Described constant current testing circuit is sampled to charging current, and compares the duty ratio that the back output error signal is controlled described pulse-width modulation circuit with a Current Control reference voltage value, thereby adjusts output current, makes output current constant;
Described constant voltage testing circuit is sampled to the voltage of charging, and compares the duty ratio that the back output error signal is controlled described pulse-width modulation circuit with a voltage control reference voltage value, thereby adjusts output voltage, makes output voltage constant.
Described constant current testing circuit and constant voltage testing circuit convert electric current and voltage error signal to current signal respectively, flow into the light-emitting diode in the photoelectrical coupler, change through this photoelectrical coupler, be delivered to described pulse-width modulation circuit, the duty ratio of control pulse-width modulation circuit.
Behind the negative electrode and output voltage setting end short circuit with a TL431 chip, export constant reference voltage, described voltage and current control reference voltage is obtained after dividing potential drop by the reference voltage that this TL431 chip provides.
Described charger also comprises a charging indication, this charging indication comprises that two IC chips and one are red, green cloudy light-emitting diode altogether, the in-phase input end of the one IC chip connects the output current detection signal, inverting input connects the predeterminated voltage of reference voltage after dividing potential drop, the one IC chip compares the anode of back output error signal to green LED, be input to the inverting input of the 2nd IC chip simultaneously, the in-phase input end of the 2nd IC chip connects described reference voltage, the 2nd IC chip compares the anode of back output error signal to red light emitting diodes, saturated by green LED indication charging, the red light emitting diodes indication is charged.
The working power of described IC chip is provided through behind the rectifying and wave-filtering by the voltage on another secondary winding of transformer.
The comparator that is adopted in described IC chip and described constant current testing circuit and the constant voltage testing circuit is LM324 comparator or LM358 amplifier.
Between described another time of transformer utmost point winding and described IC chip, be connected in series a diode, prevent the anti-filling of charging current.
Described TL431 chip is connected in series by a diode with charger output port two ends, and when constant current charge, if the charger output voltage is low excessively, then diode current flow reduces the Current Control reference voltage, thereby reduces the short-circuit output current of charger.
When described charger output wiring material, improve described voltage control reference voltage, thereby improve output voltage, compensation is because the pressure drop that wire rod lost.
Beneficial effect of the present invention is: the present invention has very wide input voltage range: AC85V～264V, like this can global general-use, owing to adopt special constant-current and constant-voltage control circuit, have high-precision constant voltage, constant current function like this, voltage and current fluctuation range when making charging is little, thus the useful life of having improved battery.
The present invention also has the output short circuit protection function, and electric current is reduced to 1/3 of output-current rating when the output short circuit, can protect charger effectively like this.The present invention is owing to adopt diode to intercept, and can prevent from that battery current is counter to irritate, because to adopt independent transformer time utmost point winding be chip power supply, also avoided anti-filling and the power loss after the battery charge simultaneously.
The present invention has simplified the circuit indicator design, can reduce the complexity of circuit like this and save cost; And the direct voltage of the present invention output, electric current and charging indication switching current value can adjust by selecting different resistance, can carry out type selecting at different products like this, and be applied widely.The present invention also has the function of voltage compensation, the pressure drop of compensation output line, and voltage falling is to the influence of charge efficiency when having avoided the output bringing onto load like this.
Description of drawings
Fig. 1 is a charger circuit block diagram of the present invention;
Fig. 2 is lithium cell charging output characteristic curve figure;
Fig. 3 is a charger circuit schematic diagram of the present invention.
Embodiment
With embodiment the present invention is described in further detail with reference to the accompanying drawings below:
As shown in Figure 1, the invention provides a kind of lithium battery charger, comprise first current rectifying and wave filtering circuit 10, pulse-width modulation circuit 11, transformer 12, second current rectifying and wave filtering circuit 13, constant current testing circuit 14 and constant voltage testing circuit 15; The alternating current of civil power input after handling, described first current rectifying and wave filtering circuit 10 is become direct current, import pulse-width modulation circuit 11 again, this direct current is become the alternating current of high frequency, the alternating current of high frequency is coupled to time utmost point by transformer 12, after second current rectifying and wave filtering circuit 13 is handled, provide the rechargable battery charging required current/voltage again; 14 pairs of charging currents of constant current testing circuit are sampled, and compare the duty ratio that the back output error signal is controlled described pulse-width modulation circuit 11 with a Current Control reference voltage value, thereby adjust output current, make output current constant; The voltage of 15 pairs of chargings of constant voltage testing circuit is sampled, and compares the duty ratio that the back output error signal is controlled described pulse-width modulation circuit 11 with a voltage control reference voltage value, thereby adjusts output voltage, makes output voltage constant.
Constant current testing circuit 14 and constant voltage testing circuit 15 convert electric current and voltage error signal to current signal respectively, flow into the light-emitting diode in the photoelectrical coupler 16, change through this photoelectrical coupler 16, be delivered to described pulse-width modulation circuit 11, the duty ratio of control pulse-width modulation circuit 11.Charger also comprises a charging indication 17, red light indication charging, and the green light indication is saturated.
Be illustrated in figure 2 as lithium cell charging output characteristic curve figure, carry out constant current charge (the C-B section among the figure) during charging earlier, when voltage is elevated to higher limit, become constant voltage charge, (i.e. B-A section among the figure), at this moment electric current reduces gradually, when being reduced to certain value, is full of by the charging indication indication.Characteristic curve when the C-D section among the figure is the output short circuit, when output voltage was lower than 1.8V, electric current and voltage all descended, and when preventing short circuit like this charger was caused damage, and carried out specific description in the back.
Figure below is specifically described in conjunction with Fig. 1 and Fig. 3:
1, current rectifying and wave filtering circuit and pulse-width modulation circuit
By bridge rectifier (the i.e. first current rectifying and wave filtering circuit 10) rectification that the alternating current of civil power input is formed through D1-D4, capacitor C 1, C2 after inductance L 1 filtering, become level and smooth direct current.This direct current becomes direct current the alternating current of high frequency (about 100KHZ) through the self-maintained circuit (being pulse-width modulation circuit 11) of resistance R 1, R2, transformer T1, switching tube Q1 (can adopt metal-oxide-semiconductor), resistance R 3, capacitor C 4 compositions.The alternating current of high frequency is coupled to time utmost point winding N3; behind second current rectifying and wave filtering circuit, 13 rectifying and wave-filterings that diode D7, capacitor C 7, inductance L 2, capacitor C 8 are formed, become required direct current again; the turn ratio of regulating transformer coil N1 and N3 can obtain different output voltages, and ZD2 carries out overvoltage protection for the overvoltage protection diode.
Resistance R 5, R6, R4, triode Q2 form the overpower protection circuit, and when power output was excessive, the Ic of switching tube Q1 increased, and the pressure drop at resistance R 5, R6 two ends raises, and the Ib of triode Q2 is increased, and the Ic of triode Q2 increases, and the Ib of switching tube Q1 reduces.The self-maintained circuit duty ratio reduces, and power output descends.Switching tube Q1, photoelectrical coupler 16 (being IC1) is formed constant voltage, constant-current control circuit in conjunction with constant voltage, the constant current testing circuit of back level.Voltage on the winding N2, behind resistance R 7, diode D6, capacitor C 8 rectifying and wave-filterings, operating voltage is provided for photoelectrical coupler IC1, the constant pressure and flow testing circuit of back level converts the error signal of output current, voltage to current signal, flows into the LED among the photoelectrical coupler IC1, carries out electricity → light → electricity conversion through photoelectrical coupler, change the electric current I c of triode among the IC1, remove to control Ib, the Ic of Q2 and the Ib of Q1, regulate the self-maintained circuit duty ratio, reach the constant pressure and flow purpose.
2, constant voltage testing circuit
Behind secondary voltage process diode D7, capacitor C 7, inductance L 2 and capacitor C 8 rectifying and wave-filterings, obtain required output voltage V o.Vo obtains sampling voltage V0 ' after resistance R 20, R20A, R21 or R22 (R21, R22 according to whether needs carry out line build-out choose one of them) dividing potential drop, be connected to the inverting input of chip IC 3B (can adopt LM324 comparator or LM358 amplifier etc., be example with LM324) here.By the reference voltage V ref=2.50V (exact value is 2.495V) that TL431 (IC4) produces, connect the in-phase input end of IC3B.After IC3B compared V0 ' and Vref, output error signal Vr1 converted current signal to by resistance R 11 and R13 again, flows into the LED among the photoelectrical coupler IC1, goes to control the duty ratio of self-maintained circuit, and V0 is remained unchanged in areas of permanent pressure.The frequency compensation network of voltage control loop is made up of capacitor C 10, resistance R 26.Behind the negative electrode (the 3rd pin) and output voltage setting end (the 1st pin) short circuit with IC4, can produce output voltage V ref=2.50V.R9 is a current-limiting resistance, and the operating current of IC4 can be limited in the working range of requirement (is 1～10mA).
3, constant current testing circuit
IC3A is the voltage comparator in the current regulator, and its inverting input meets current detection signal Vr6, and in-phase input end meets voltage divider voltage Vry1.Voltage divider is made of resistance R 17, R18, IC4.IC3A is after comparing Vr6 and Vry1, output error signal Vr2 becomes current signal by resistance R 11, R12 again, flows into the LED in the optical coupler, and then the duty ratio of control self-maintained circuit, make the electric current I oh of power supply output in the constant current district, keep constant.
4, control circuit supply power mode
Voltage on the secondary bias voltage winding N4 behind D8, C6 rectifying and wave-filtering, obtains bias voltage Vsb, power supply is provided for specially LM324 and TL431.
5, output short circuit protection
Short-circuit protection is that the circuit constant current is operated in output voltage less than 1.8V during the stage; reduce the reference voltage (be about output voltage 〉=1.8 o'clock 1/3) of Current Control; thereby reach the reduction short-circuit output current; the purpose of protection charger; its principle is: when output voltage greater than 1.8V the time; the reference voltage of Current Control is provided by IC4 (2.5V); when output voltage during less than 1.8V; because diode D9 conducting; Current Control fiducial value benchmark changes the (forward voltage drop of output voltage V ou+ diode D9=Vou+0.7V) into; this fiducial value is less than 2.5V; like this, fiducial value is reduced to 0.7/2.5 ≈ 1/3 constant current set point when short circuit, and output current is also reduced to 1/3 of constant current set point; reduce short-circuit output current like this, protected charger.
6, charging indication (red light indication charging, the green light indication is saturated)
Charger also comprises a charging indication 17, chip IC 3C, IC3D (can adopt LM324 comparator or LM358 amplifier etc., here with LM324 example), resistance R 14, R15, chip TL431, red, green cloudy LED has altogether formed charging indication 17 jointly, the in-phase input end of IC3C meets current detection signal Vr6, inverting input meets voltage divider voltage Vry2, voltage divider is by resistance R 14,15 and chip TL431 form, IC3C is with VR6, Vry2 compares back output error signal Vr3, as current detection signal VR6 during greater than set point [2.5*R14/ (R14+R15)], the IC3C output low level, green LED is put out, and the output of IC3C is added in the IC3D inverting input simultaneously.The in-phase input end of IC3D connects the benchmark of 2.5V, V-＜V+ of IC3D, and IC3D exports high level, and red LED is bright; Otherwise green LED is bright, and red LED is put out.
It is 7, anti-that battery current is counter irritates,
Increased the N4 winding in the circuit of the present invention and powered, simultaneously in conjunction with time utmost point rectifier system, so when battery is full of electricity and charger and does not work to control circuit.Utilize the unilateal conduction characteristic of diode, when D7, D8 stop the circuit formation loop of battery and adapter, prevented from that battery current is counter to irritate.
8, voltage compensation
When the output connection material,, make output end voltage be lower than set point because the impedance of wire rod can produce pressure drop when output current increases.This circuit is formed voltage compensating circuit by resistance R 23, R21 in conjunction with constant voltage circuit.When output current increases, improve output voltage automatically, the compensating wire pressure drop.Resistance R 21, R22 are selected for use according to whether needing voltage compensation, and R21, R22 resistance equate, use R21 when needing voltage compensation, use R22 when not needing voltage compensation.
The operation principle of voltage compensation: use R21 when needing voltage compensation, without R22, if Vr5 is the voltage reference point, when no current is exported, R23 does not have pressure drop and produces Vr5=Vr6, and when electric current was exported, resistance R 23 two ends had pressure drop and produce (internal resistance of resistance=output line of R23), at this moment Vr5＜Vr6 raises when promptly the in-phase input end level of IC3B is exported with respect to no current.This rising level is delivered to constant voltage circuit, after constant voltage circuit control.Make output voltage V o height when unloaded, boosted voltage equals the pressure drop that wire rod produces.
9, output voltage, electric current and charging indication (commentaries on classics lamp) electric current are adjustable
A, circuit by adjust resistance R 20, R21 (or R22) changes the magnitude of voltage that partial pressure value reaches institute's palpus;
B, circuit by adjust resistance R 17, R18 changes the current value that partial pressure value reaches institute's palpus;
C, circuit by adjust resistance R 14, R15 changes the charging indicator current value that partial pressure value reaches institute's palpus.
Like this, when charging, carry out constant current charge earlier, constant by constant current testing circuit Control current value, when voltage is elevated to higher limit, become constant voltage charge, control the constant of magnitude of voltage by the constant voltage testing circuit, at this moment electric current reduces gradually, when being reduced to certain value, be full of by the charging indication indication.
The present invention has very wide input voltage range: AC85V～264V, like this can global general-use, owing to adopt special constant-current and constant-voltage control circuit, have high-precision constant voltage, constant current function like this, the voltage and current fluctuation range when making charging is little (can to make fluctuation＜1%Vo).The present invention also has the output short circuit protection function; prevent anti-function, the output line voltage compensate function of irritating of battery current; simplified the circuit indicator design; and the direct voltage of the present invention's output, electric current and charging indication switching current value can be adjusted by selecting different resistance; can carry out type selecting at different products like this, applied widely.
The present invention can be widely used in palmtop computer, PDA, communication equipment, camera etc., those skilled in the art do not break away from essence of the present invention and spirit, can there be the various deformation scheme to realize the present invention, the above only is the preferable feasible embodiment of the present invention, be not so limit to interest field of the present invention, the equivalent structure that all utilizations specification of the present invention and accompanying drawing content are done changes, and all is contained within the interest field of the present invention.
Claims (9)
1, a kind of lithium battery charger is characterized in that: comprise first current rectifying and wave filtering circuit, pulse-width modulation circuit, transformer, second current rectifying and wave filtering circuit, constant current testing circuit and constant voltage testing circuit;
Become direct current after the ac process of described first current rectifying and wave filtering circuit with the civil power input, import described pulse-width modulation circuit again, this direct current is become high-frequency alternating current, high-frequency alternating current is by described transformer coupled to time utmost point, after described second current rectifying and wave filtering circuit is handled, provide the rechargable battery charging required current/voltage again;
Described constant current testing circuit is sampled to charging current, and compares the duty ratio that the back output error signal is controlled described pulse-width modulation circuit with a Current Control reference voltage value, thereby adjusts output current, makes output current constant;
Described constant voltage testing circuit is sampled to the voltage of charging, and compares the duty ratio that the back output error signal is controlled described pulse-width modulation circuit with a voltage control reference voltage value, thereby adjusts output voltage, makes output voltage constant.
2, lithium battery charger according to claim 1, it is characterized in that: described constant current testing circuit and constant voltage testing circuit convert electric current and voltage error signal to current signal respectively, flow into the light-emitting diode in the photoelectrical coupler, change through this photoelectrical coupler, be delivered to described pulse-width modulation circuit, the duty ratio of control pulse-width modulation circuit.
3, lithium battery charger according to claim 2, it is characterized in that: behind the negative electrode and output voltage setting end short circuit with a TL431 chip, export constant reference voltage, described voltage and current control reference voltage is obtained after dividing potential drop by the reference voltage that this TL431 chip provides.
4, according to claim 1,2 or 3 described lithium battery chargers, it is characterized in that: described charger also comprises a charging indication, this charging indication comprises that two IC chips and one are red, green cloudy light-emitting diode altogether, the in-phase input end of the one IC chip connects the output current detection signal, inverting input connects the predeterminated voltage of reference voltage after dividing potential drop, the one IC chip compares the anode of back output error signal to green LED, be input to the inverting input of the 2nd IC chip simultaneously, the in-phase input end of the 2nd IC chip connects described reference voltage, the 2nd IC chip compares the anode of back output error signal to red light emitting diodes, saturated by green LED indication charging, the red light emitting diodes indication is charged.
5, lithium battery charger according to claim 4 is characterized in that: the working power of described IC chip is provided through behind the rectifying and wave-filtering by the voltage on another secondary winding of transformer.
6, lithium battery charger according to claim 5 is characterized in that: the comparator that is adopted in described IC chip and described constant current testing circuit and the constant voltage testing circuit is LM324 comparator or LM358 amplifier.
7, lithium battery charger according to claim 5 is characterized in that: be connected in series a diode between described another time of transformer utmost point winding and described IC chip, prevent the anti-filling of charging current.
8, lithium battery charger according to claim 4, it is characterized in that: described TL431 chip is connected in series by a diode with charger output port two ends, when constant current charge, if the charger output voltage is low excessively, diode current flow then, the Current Control reference voltage is reduced, thereby reduce the short-circuit output current of charger.
9, lithium battery charger according to claim 4 is characterized in that: when described charger output wiring material, improve described voltage control reference voltage, thereby improve output voltage, compensation is because the pressure drop that wire rod lost.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2004100264970A CN1564421A (en) | 2004-03-17 | 2004-03-17 | Charger for lithium cell |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2004100264970A CN1564421A (en) | 2004-03-17 | 2004-03-17 | Charger for lithium cell |
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| CN1564421A true CN1564421A (en) | 2005-01-12 |
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| CNA2004100264970A Pending CN1564421A (en) | 2004-03-17 | 2004-03-17 | Charger for lithium cell |
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Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US7755328B2 (en) | 2006-03-17 | 2010-07-13 | Innocom Technology (Shenzhen) Co., Ltd. | Charging circuit |
| CN101154824B (en) * | 2006-09-29 | 2010-09-01 | 亚源科技股份有限公司 | Charger circuit with output voltage compensation |
| CN101969707A (en) * | 2010-08-10 | 2011-02-09 | 佛山市顺德区瑞德电子实业有限公司 | Revolving light circuit of battery charger |
| CN101355263B (en) * | 2007-07-25 | 2011-05-11 | 索尼株式会社 | Battery charger |
| CN102064566A (en) * | 2009-11-17 | 2011-05-18 | 硕颉科技股份有限公司 | Charging device, electronic device and charging method |
| CN101902054B (en) * | 2009-05-26 | 2012-12-26 | 辉芒微电子（深圳）有限公司 | Charging state indication device and charger |
| CN103036212A (en) * | 2011-09-30 | 2013-04-10 | 皆盈绿动能科技股份有限公司 | Battery output short-circuit protection circuit |
| CN101714772B (en) * | 2008-10-07 | 2013-08-21 | 株式会社牧田 | Charging apparatus |
| CN103872890A (en) * | 2014-03-31 | 2014-06-18 | 广州视源电子科技股份有限公司 | Switching power supply circuit with short-circuit protection function |
| CN105356526A (en) * | 2015-09-08 | 2016-02-24 | 上海空间电源研究所 | Single-charging and single-cutting charging method and charging system for storage batteries |
| CN106598104A (en) * | 2017-01-05 | 2017-04-26 | 刘泽法 | Lithium battery temperature digital controller |
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| WO2017133195A1 (en) * | 2016-02-05 | 2017-08-10 | 广东欧珀移动通信有限公司 | Charging system, charging method, and power adapter for terminal |
| EP3276778A1 (en) * | 2016-07-26 | 2018-01-31 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Charging system, lightning protection method for terminal during charging, and power adapter |
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| CN108539836A (en) * | 2018-05-31 | 2018-09-14 | 奥克斯空调股份有限公司 | Include the charging circuit and air conditioner of anti-short-circuit protection circuit |
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| CN110920427A (en) * | 2019-12-06 | 2020-03-27 | 株洲大川电子技术有限公司 | 100W battery charger suitable for unmanned aerial vehicle |
| CN113783280A (en) * | 2021-07-21 | 2021-12-10 | 上海汉想新能源科技有限公司 | Lithium battery charging power supply suitable for 1500V photovoltaic system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7755328B2 (en) | 2006-03-17 | 2010-07-13 | Innocom Technology (Shenzhen) Co., Ltd. | Charging circuit |
| CN101154824B (en) * | 2006-09-29 | 2010-09-01 | 亚源科技股份有限公司 | Charger circuit with output voltage compensation |
| CN101355263B (en) * | 2007-07-25 | 2011-05-11 | 索尼株式会社 | Battery charger |
| TWI392194B (en) * | 2007-07-25 | 2013-04-01 | Sony Corp | Battery charger |
| CN101714772B (en) * | 2008-10-07 | 2013-08-21 | 株式会社牧田 | Charging apparatus |
| CN101902054B (en) * | 2009-05-26 | 2012-12-26 | 辉芒微电子（深圳）有限公司 | Charging state indication device and charger |
| CN102064566A (en) * | 2009-11-17 | 2011-05-18 | 硕颉科技股份有限公司 | Charging device, electronic device and charging method |
| CN102064566B (en) * | 2009-11-17 | 2013-03-06 | 硕颉科技股份有限公司 | Charging device, electronic device and charging method |
| CN101969707B (en) * | 2010-08-10 | 2015-12-30 | 广东瑞德智能科技股份有限公司 | A kind of lamp switching circuit of battery charger |
| CN101969707A (en) * | 2010-08-10 | 2011-02-09 | 佛山市顺德区瑞德电子实业有限公司 | Revolving light circuit of battery charger |
| CN103036212A (en) * | 2011-09-30 | 2013-04-10 | 皆盈绿动能科技股份有限公司 | Battery output short-circuit protection circuit |
| CN103036212B (en) * | 2011-09-30 | 2016-10-05 | 皆盈绿动能科技股份有限公司 | battery output short-circuit protection circuit |
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