CN103236568A - Charging method and charging system - Google Patents
Charging method and charging system Download PDFInfo
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- CN103236568A CN103236568A CN2013101593809A CN201310159380A CN103236568A CN 103236568 A CN103236568 A CN 103236568A CN 2013101593809 A CN2013101593809 A CN 2013101593809A CN 201310159380 A CN201310159380 A CN 201310159380A CN 103236568 A CN103236568 A CN 103236568A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/10—Energy storage using batteries
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Abstract
The invention discloses a charging method and a charging system. The charging method comprises the steps that a mobile terminal detects charging current and battery voltage, and sends a corresponding control signal to a charger according to the detected charge current and battery voltage, and the charger controls output voltage according to the corresponding control signal, so that the charge current can be adjusted. The optimal charge current can be matched according to the current battery voltage, so that the charging efficiency is maximized, and the quick and efficient charging is achieved. The charger directly controls the output voltage to adjust the magnitude of the charging current, so that charging heat due to the loss of electric energy is not caused, the charging safety is improved, and the energy waste is reduced.
Description
Technical field
The present invention relates to electronic technology field, especially relate to a kind of charging method and charging system.
Background technology
The function of portable terminal is become stronger day by day, its display screen is also increasing, thereby making the user experience is greatly improved, the user carries out basic conversation except utilizing portable terminal, more be to carry out work, amusement, surf the web at portable terminal, therefore use is frequent day by day, causes portable terminal power consumption big, therefore its battery capacity is increasing, and it is more and more frequent to charge.To portable terminal charging rapidly and efficiently, be the current problem of needing solution badly how.
In the battery charging process to portable terminal, each charging stage, its optimal charge electric current difference, this optimal charge electric current can improve charge efficiency to quickly charging battery.Therefore need to adjust in real time charging current in the charging process, make it can both realize the optimal charge current charges in each charging stage, improve charge efficiency.
In the existing charging method, charger its output voltage in charging process remains unchanged, and by portable terminal inside charging current is adjusted, to realize the optimum current charging.A kind of linear-charging pattern for example, the AC/DC converting unit of charger (Alternating Current/Direct Current converting unit, be the ac/dc converting unit) alternating current is converted to direct current, and charge to the 5V voltage of portable terminal delivered constant, the central processing unit of portable terminal detects charging current and cell voltage, control the transistorized conducting internal resistance of portable terminal according to detected charging current and cell voltage, regulate charging current with this.This charging modes is regulated charging current by portable terminal inside, and charge efficiency is very low, and transistor heating when big current work is serious, influences the fail safe of portable terminal on the one hand, causes the waste of the energy on the other hand.
Summary of the invention
Main purpose of the present invention is to provide a kind of charging method and charging system, is intended to realize charging rapidly and efficiently.
To achieve these objectives, the present invention proposes a kind of charging method, comprises step:
Portable terminal detects charging current and cell voltage;
Described portable terminal sends corresponding control signal according to detected charging current and cell voltage to charger;
Described charger is according to corresponding control signal control output voltage.
Preferably, described portable terminal sends corresponding control signal according to detected charging current and cell voltage to charger and comprises:
Described portable terminal is judged the size of the corresponding predetermined threshold value of described cell voltage and described charging current;
If described predetermined threshold value is greater than described charging current, then described portable terminal sends first control signal to charger;
If described predetermined threshold value is less than described charging current, then described portable terminal sends second control signal to charger.
Preferably, described charger comprises according to corresponding control signal control output voltage:
If described charger is received described first control signal, then according to this first control signal boosted output voltages;
If described charger is received described second control signal, then reduce output voltage according to this second control signal.
Also comprise when preferably, described portable terminal is judged the step of size of the corresponding predetermined threshold value of described cell voltage and described charging current:
Described portable terminal judges whether described cell voltage reaches rated voltage;
If described cell voltage has reached rated voltage, then described portable terminal sends the 3rd control signal to charger.
Preferably, described charger comprises according to corresponding control signal control output voltage:
If described charger is received described the 3rd control signal, then stop output voltage according to described the 3rd control signal.
Preferably, described control signal is the zero current pulse that sends preset times in Preset Time.
The present invention proposes a kind of charging system simultaneously, comprises portable terminal and charger, wherein:
Portable terminal for detection of charging current and cell voltage, and sends corresponding control signal according to detected charging current and cell voltage to described charger;
Charger be used for to receive the control signal of described portable terminal, and controls it to the output voltage of described portable terminal output according to corresponding control signal.
Preferably, described portable terminal comprises central processing unit, battery and transistor, and described charger comprises control unit and AC/DC converting unit, wherein:
Central processing unit for detection of charging current and cell voltage, and is controlled described transistor according to detected charging current and cell voltage and is sent corresponding control signal to described control unit;
Control unit is used for receiving described control signal, and controls the output voltage of described AC/DC converting unit according to corresponding control signal;
The AC/DC converting unit is used for electrically connecting by the described battery of described transistor AND gate, with to described battery charge.
Preferably, described central processing unit is used for judging the size of the corresponding predetermined threshold value of described cell voltage and described charging current;
If described predetermined threshold value is greater than described charging current, then described central processing unit is controlled described transistor and is sent first control signal to described control unit, and described control unit is according to the raise output voltage of described AC/DC converting unit of described first control signal;
If described predetermined threshold value is less than described charging current, then described central processing unit is controlled described transistor and is sent second control signal to described control unit, and described control unit reduces the output voltage of described AC/DC converting unit according to described second control signal.
Preferably, described central processing unit also is used for judging whether described cell voltage reaches rated voltage; If described cell voltage has reached rated voltage, then described central processing unit is controlled described transistor and is sent the 3rd control signal to described control unit, and described control unit is controlled described AC/DC converting unit according to described the 3rd control signal and stopped output voltage.
A kind of charging method provided by the present invention, can communicate by default communication protocol between portable terminal and the charger, wherein portable terminal is by detecting charging current and cell voltage, and send corresponding control signal according to detected charging current and cell voltage to charger, charger is then controlled output voltage according to corresponding control signal, and then can adjust charging current, thereby can match best charging current according to current battery voltage, make and the charge efficiency maximization realized charging rapidly and efficiently.Directly control the size that output voltage is adjusted charging current by charger, can not cause the loss of electric energy to cause the charging heating, improved the charging fail safe, reduced energy waste.
Description of drawings
Fig. 1 is the flow chart of charging method first embodiment of the present invention;
Fig. 2 is the oscillogram of first control signal in the charging method of the present invention;
Fig. 3 is the oscillogram of second control signal in the charging method of the present invention;
Fig. 4 is the oscillogram of the 3rd control signal in the charging method of the present invention;
Fig. 5 is the flow chart of charging method second embodiment of the present invention;
Fig. 6 is the structural representation of charging system one embodiment of the present invention;
Fig. 7 is the structural representation of another embodiment of charging system of the present invention.
The realization of the object of the invention, functional characteristics and advantage will be in conjunction with the embodiments, are described further with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein only in order to explaining the present invention, and be not used in restriction the present invention.
Referring to Fig. 1, charging method first embodiment of the present invention is proposed, described charging method may further comprise the steps:
Step S101, portable terminal detect charging current and cell voltage.
After portable terminal and charger electrically connected, charger then charged to portable terminal, and in charging process, portable terminal detects charging current and cell voltage in real time.
Step S102, portable terminal judge that whether the corresponding predetermined threshold value of cell voltage is greater than charging current.
Along with the battery of charger to portable terminal charges, cell voltage raises gradually, and along with the rising of cell voltage, its best charging current is also changing.Be the battery voltage value of each range section, the optimal charge current value difference that it is corresponding in order to improve charge efficiency, need be adjusted charging current accordingly according to cell voltage.Therefore, each charging stage, the predetermined threshold value of corresponding optimal charge electric current is arranged, the predetermined threshold value of each battery has nothing in common with each other.Portable terminal is then according to detected charging current and cell voltage, judges the size of the corresponding predetermined threshold value of current battery voltage and current charging current, sends corresponding control signal according to judged result to charger.If judged result be predetermined threshold value greater than charging current, then enter step S103; If judged result be predetermined threshold value less than charging current, then enter step S105.
Step S103, portable terminal send first control signal to charger.
Communicate by default communication protocol between the portable terminal of present embodiment and the charger.Portable terminal sends corresponding control signal according to detected charging current and cell voltage to charger, and described control signal is the zero current pulse that sends preset times in Preset Time.As Fig. 2-Figure 4 shows that oscillogram of three kinds of control signals in the communication protocol between portable terminal and the charger among the present invention who exemplifies, wherein abscissa is time t, ordinate is electric current I, Preset Time is 100ms, preset times can be for 1 time or repeatedly, when 1 zero current pulse of transmission in 100ms then is first control signal (as shown in Figure 2), then be second control signal (as shown in Figure 3) when in 100ms, sending 2 zero current pulses, the rest may be inferred.Wherein portable terminal sends the zero current pulse to charger, the transistorized disconnection that is the central processing unit control portable terminal by portable terminal realizes, be that central processing unit disconnects preset times at Preset Time inner control transistor, thereby be implemented in the zero current pulse that sends preset times in the Preset Time to charger, form corresponding control signal.
Among this step S103, portable terminal is judged predetermined threshold value greater than charging current, then sends first control signal continuously to charger, as shown in Figure 2, sends 1 zero current pulse to charger in 100ms.
Step S104, charger are according to the first control signal boosted output voltages.
After charger was received first control signal that portable terminal sends, according to default communication protocol, boosted output voltages was so that charging current increases.Charger is whenever received first control signal one time, just corresponding unit of boosted output voltages, equate with predetermined threshold value up to charging current, portable terminal just stops to send first control signal, the charger output voltage that then tops out, keep current optimal charge electric current, make charge efficiency maximize.
Step S105, portable terminal send second control signal to charger.
Portable terminal is judged predetermined threshold value greater than charging current, then sends second control signal continuously to charger, as shown in Figure 3, sends 2 zero current pulses to charger in 100ms.
Step S106, charger reduce output voltage according to second control signal.
After charger is received second control signal that portable terminal sends, according to default communication protocol, reduce output voltage, so that charging current reduces.Charger is whenever received second control signal one time, just reduce unit of output voltage accordingly, equate with predetermined threshold value up to charging current, portable terminal just stops to send second control signal, charger then stops to reduce output voltage, keep current optimal charge electric current, make charge efficiency maximize.
Accordingly, the charging method of present embodiment, can communicate by default communication protocol between portable terminal and the charger, wherein portable terminal is by detecting charging current and cell voltage, and send corresponding control signal according to detected charging current and cell voltage to charger, charger is then controlled output voltage according to corresponding control signal, and then can adjust charging current, thereby can match best charging current according to current battery voltage, make and the charge efficiency maximization realized charging rapidly and efficiently.Directly control the size that output voltage is adjusted charging current by charger, can not cause the loss of electric energy to cause the charging heating, improved fail safe, reduced energy waste.
Referring to Fig. 5, charging method second embodiment of the present invention is proposed, described charging method may further comprise the steps:
Step S201, portable terminal detect charging current and cell voltage.
After portable terminal and charger electrically connected, charger then charged to portable terminal, and in charging process, portable terminal detects charging current and cell voltage in real time.
Step S202, portable terminal judge that whether the corresponding predetermined threshold value of cell voltage is greater than charging current.
Along with the battery of charger to portable terminal charges, cell voltage raises gradually, and along with the rising of cell voltage, its best charging current is also changing.Be the battery voltage value of each range section, the optimal charge current value difference that it is corresponding in order to improve charge efficiency, need be adjusted charging current accordingly according to cell voltage.Therefore, each charging stage, the predetermined threshold value of corresponding optimal charge electric current is arranged, the predetermined threshold value of each battery has nothing in common with each other.Portable terminal is then according to detected charging current and cell voltage, judges the size of the corresponding predetermined threshold value of current battery voltage and current charging current, sends corresponding control signal according to judged result to charger.If judged result be predetermined threshold value greater than charging current, then enter step S203; If judged result be predetermined threshold value less than charging current, then enter step S205.
Step S203, portable terminal send first control signal to charger.
Communicate by default communication protocol between the portable terminal of present embodiment and the charger.Portable terminal sends corresponding control signal according to detected charging current and cell voltage to charger, and described control signal is the zero current pulse that sends preset times in Preset Time.The oscillogram of three kinds of control signals in the portable terminal of the present invention that exemplifies as Fig. 2-Figure 4 shows that and the communication protocol between the charger, wherein abscissa is time t, ordinate is electric current I, Preset Time is 100ms, preset times can be for 1 time or repeatedly, when 1 zero current pulse of transmission in 100ms then is first control signal (as shown in Figure 2), when 2 zero current pulses of transmission in 100ms then are second control signal (as shown in Figure 3), then be the 3rd control signal (as shown in Figure 4) when in 100ms, sending 3 zero current pulses.Wherein portable terminal sends the zero current pulse to charger, the transistorized disconnection that is the central processing unit control portable terminal by portable terminal realizes, be that central processing unit disconnects preset times at Preset Time inner control transistor, thereby be implemented in the zero current pulse that sends preset times in the Preset Time to charger, form corresponding control signal.
Among this step S203, portable terminal is judged predetermined threshold value greater than charging current, then sends first control signal continuously to charger, as shown in Figure 2, sends 1 zero current pulse to charger in 100ms.
Step S204, charger are according to the first control signal boosted output voltages.
After charger was received first control signal that portable terminal sends, according to default communication protocol, boosted output voltages was so that charging current increases.Charger is whenever received first control signal one time, just corresponding unit of boosted output voltages, equate with predetermined threshold value up to charging current, portable terminal just stops to send first control signal, the charger output voltage that then tops out, keep current optimal charge electric current, make charge efficiency maximize.
Step S205, portable terminal send second control signal to charger.
Portable terminal is judged predetermined threshold value greater than charging current, then sends second control signal continuously to charger, as shown in Figure 3, sends 2 zero current pulses to charger in 100ms.
Step S206, charger reduce output voltage according to second control signal.
After charger is received second control signal that portable terminal sends, according to default communication protocol, reduce output voltage, so that charging current reduces.Charger is whenever received second control signal one time, just reduce unit of output voltage accordingly, equate with predetermined threshold value up to charging current, portable terminal just stops to send second control signal, charger then stops to reduce output voltage, keep current optimal charge electric current, make charge efficiency maximize.
Step S207, portable terminal judge whether cell voltage reaches rated voltage.
The charging method of present embodiment is when carrying out step S202, and portable terminal can judge also whether cell voltage reaches the rated voltage of battery.If described cell voltage does not also reach rated voltage, illustrate that battery also is not full of, portable terminal is then ignored judged result, returns step S202, proceeds charging flow; If described cell voltage has reached rated voltage, illustrate that battery is full of, then enter step S208.
Step S208, portable terminal send the 3rd control signal to charger.
Portable terminal sends the 3rd control signal to charger, as shown in Figure 4, sends 3 zero current pulses to charger in 100ms.
Step S209, charger stop output voltage according to the 3rd control signal.
After charger was received the 3rd control signal that portable terminal sends, the communication protocol according to default stopped to the portable terminal output voltage, charging flow finishes, thereby can prevent over-charging of battery and cause infringement to battery, further improve fail safe, prolong battery useful life.Simultaneously, the central processing unit of portable terminal is also controlled the transistor disconnection.
Referring to Fig. 6, Fig. 7, charging system of the present invention is proposed, described charging system comprises portable terminal 100 and charger 200, described charger 200 electrically connects AC power and portable terminals 100, and gives portable terminal 100 chargings after alternating current is converted to direct current.In charging process, described portable terminal 100 is for detection of charging current and cell voltage, and sends corresponding control signal for charger 200 according to detected charging current and cell voltage; Described charger 200 is used for receiving the control signal of described portable terminal 100, and controls it to the output voltage of described portable terminal 100 outputs according to corresponding control signal.
Described portable terminal 100 comprises central processing unit 110, battery 120 and transistor 130, and is identical with portable terminal of the prior art on the hardware, only needs to upgrade at software.Described charger 200 comprises AC/DC converting unit 220, has increased a control unit 210 simultaneously newly, and it is used for communicating by default communication protocol with portable terminal 100, and control AC/DC converting unit 220 output voltages.Described AC/DC converting unit 220 electrically connects with battery 120 by the transistor 130 of portable terminal 100, and it is converted to direct current with alternating current, and to described transistor 130 output voltages, charges to battery 120 by transistor 130; Described central processing unit 110 detects charging current and cell voltage in real time, and controls described transistor 130 to the corresponding control signal of control unit 210 transmissions of charger 200 according to detected charging current and cell voltage; After described control unit 210 receives the control signal of portable terminal 100, then control the output voltage of AC/DC converting unit 220 according to corresponding control signal.As shown in Figure 6, be connected by power line 230 between portable terminal 100 and the charger 200 and charge, connect an order wire 240 again and communicate; Also can save order wire 240, and their power line of multiplexing connection 230 communicate as shown in Figure 7.
Concrete, after portable terminal 100 electrically connected by power line 230 with charger 200,200 of chargers charged to portable terminal 100, and in charging process, the central processing unit 110 of portable terminal 100 detects charging current and cell voltages in real time.Along with the battery of 200 pairs of portable terminals 100 of charger charges, cell voltage raises gradually, and along with the rising of cell voltage, its best charging current is also changing.Be the battery voltage value of each range section, the optimal charge current value difference that it is corresponding in order to improve charge efficiency, need be adjusted charging current accordingly according to cell voltage.Therefore, each charging stage, the predetermined threshold value of corresponding optimal charge electric current is arranged, the predetermined threshold value of each battery 120 has nothing in common with each other.110 of central processing units are according to detected charging current and cell voltage, judge the size of the corresponding predetermined threshold value of current battery voltage and current charging current, control described transistor 130 to the corresponding control signal of control unit 210 transmissions of charger 200 according to judged result.
Described control signal is the zero current pulse that sends preset times in Preset Time.As Fig. 2-Figure 4 shows that oscillogram of three kinds of control signals in the communication protocol between portable terminal 100 and the charger 200 in the charging system of the present invention that exemplifies, wherein abscissa is time t, ordinate is electric current I, Preset Time is 100ms, preset times can be for 1 time or repeatedly, when 1 zero current pulse of transmission in 100ms then is first control signal (as shown in Figure 2), when 2 zero current pulses of transmission in 100ms then are second control signal (as shown in Figure 3), then be the 3rd control signal (as shown in Figure 4) when in 100ms, sending 3 zero current pulses.Wherein portable terminal 100 is sent out 200 to charger and is sent the zero current pulse, be to realize by the disconnection that the central processing unit 110 of portable terminal 100 is controlled the transistor 130 of portable terminals 100, be that central processing unit 110 disconnects preset times at Preset Time inner control transistor 130, thereby be implemented in the zero current pulse that sends preset times in the Preset Time to the control unit 210 of charger 200, form corresponding control signal.
If central processing unit 110 judges that predetermined threshold value is greater than charging current, then control transistor 130 to control unit 210 continuous first control signals that send of charger 200, as shown in Figure 2, control transistor 130 disconnects 1 time in 100ms, namely sends 1 zero current pulse in 100ms; After the control unit 210 of charger 200 was received first control signal that portable terminal 100 sends, according to default communication protocol, control AC/DC converting unit 220 boosted output voltages were so that charging current increases.Charger 200 is whenever received first control signal one time, just corresponding unit of boosted output voltages, equate with predetermined threshold value up to charging current, portable terminal 100 just stops to send first control signal, 200 output voltages that top out of charger, keep current optimal charge electric current, make charge efficiency maximize.If central processing unit 110 judges that predetermined threshold value is less than charging current, then control transistor 130 to control unit 210 continuous second control signals that send of charger 200, as shown in Figure 3, control transistor 130 disconnects 2 times in 100ms, namely sends 2 zero current pulses in 100ms; After the control unit 210 of charger 200 was received second control signal that portable terminal 100 sends, according to default communication protocol, control AC/DC converting unit 220 reduced output voltages, so that charging current increases.Charger 200 is whenever received second control signal one time, just reduce unit of output voltage accordingly, equate with predetermined threshold value up to charging current, portable terminal 100 just stops to send second control signal, 200 of chargers stop to reduce output voltage, keep current optimal charge electric current, make charge efficiency maximize.
Accordingly, the charging system of present embodiment, can communicate by default communication protocol between portable terminal 100 and the charger 200, wherein portable terminal 100 is by detecting charging current and cell voltage, and send corresponding control signal according to detected charging current and cell voltage to charger 200,200 corresponding control signals of basis of charger are controlled output voltage, and then can adjust charging current, thereby can match best charging current according to current battery voltage, make charge efficiency maximize.Directly control the size that output voltage is adjusted charging current by charger 200, can not cause the loss of electric energy to cause the charging heating, improved fail safe, reduced energy waste.
Further, the central processing unit 110 of portable terminal 100 judges simultaneously whether cell voltage reaches the rated voltage of battery 120.If described cell voltage does not also reach rated voltage, illustrate that battery 120 also is not full of, 110 of central processing units are ignored judged result, continue charging flow; If described cell voltage has reached rated voltage, illustrate that battery 120 has been full of, 110 control of CPU transistor 130 is sent out 210 to the control unit of charger 200 and is sent the 3rd control signal, as shown in Figure 4, control transistor 130 disconnects 3 times in 100ms, namely sends 3 zero current pulses in 100ms.After the control unit 210 of charger 200 is received the 3rd control signal that portable terminal 100 sends, according to default communication protocol, control AC/DC converting unit 220 stops to portable terminal 100 output voltages, charging flow finishes, thereby can prevent battery 120 from overcharging and cause infringement to battery 120, further improve fail safe, prolonged 120 useful lifes of battery.Simultaneously, the central processing unit 110 control transistors 130 of portable terminal 100 disconnect.
Should be understood that; below only be the preferred embodiments of the present invention; can not therefore limit claim of the present invention; every equivalent structure or equivalent flow process conversion that utilizes specification of the present invention and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.
Claims (10)
1. a charging method is characterized in that, comprises step:
Portable terminal detects charging current and cell voltage;
Described portable terminal sends corresponding control signal according to detected charging current and cell voltage to charger;
Described charger is according to corresponding control signal control output voltage.
2. charging method according to claim 1 is characterized in that, described portable terminal sends corresponding control signal according to detected charging current and cell voltage to charger and comprises:
Described portable terminal is judged the size of the corresponding predetermined threshold value of described cell voltage and described charging current;
If described predetermined threshold value is greater than described charging current, then described portable terminal sends first control signal to charger;
If described predetermined threshold value is less than described charging current, then described portable terminal sends second control signal to charger.
3. charging method according to claim 2 is characterized in that, described charger comprises according to corresponding control signal control output voltage:
If described charger is received described first control signal, then according to this first control signal boosted output voltages;
If described charger is received described second control signal, then reduce output voltage according to this second control signal.
4. charging method according to claim 2 is characterized in that, described portable terminal also comprises when judging the step of size of the corresponding predetermined threshold value of described cell voltage and described charging current:
Described portable terminal judges whether described cell voltage reaches rated voltage;
If described cell voltage has reached rated voltage, then described portable terminal sends the 3rd control signal to charger.
5. charging method according to claim 4 is characterized in that, described charger comprises according to corresponding control signal control output voltage:
If described charger is received described the 3rd control signal, then stop output voltage according to described the 3rd control signal.
6. according to each described charging method of claim 1-5, it is characterized in that described control signal is the zero current pulse that sends preset times in Preset Time.
7. a charging system is characterized in that, comprises portable terminal and charger, wherein:
Portable terminal for detection of charging current and cell voltage, and sends corresponding control signal according to detected charging current and cell voltage to described charger;
Charger be used for to receive the control signal of described portable terminal, and controls it to the output voltage of described portable terminal output according to corresponding control signal.
8. charging system according to claim 7 is characterized in that, described portable terminal comprises central processing unit, battery and transistor, and described charger comprises control unit and AC/DC converting unit, wherein:
Central processing unit for detection of charging current and cell voltage, and is controlled described transistor according to detected charging current and cell voltage and is sent corresponding control signal to described control unit;
Control unit is used for receiving described control signal, and controls the output voltage of described AC/DC converting unit according to corresponding control signal;
The AC/DC converting unit is used for electrically connecting by the described battery of described transistor AND gate, with to described battery charge.
9. charging system according to claim 8 is characterized in that, described central processing unit is used for judging the size of the corresponding predetermined threshold value of described cell voltage and described charging current;
If described predetermined threshold value is greater than described charging current, then described central processing unit is controlled described transistor and is sent first control signal to described control unit, and described control unit is according to the raise output voltage of described AC/DC converting unit of described first control signal;
If described predetermined threshold value is less than described charging current, then described central processing unit is controlled described transistor and is sent second control signal to described control unit, and described control unit reduces the output voltage of described AC/DC converting unit according to described second control signal.
10. charging system according to claim 9 is characterized in that, described central processing unit also is used for judging whether described cell voltage reaches rated voltage; If described cell voltage has reached rated voltage, then described central processing unit is controlled described transistor and is sent the 3rd control signal to described control unit, and described control unit is controlled described AC/DC converting unit according to described the 3rd control signal and stopped output voltage.
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| CN103779945A (en) * | 2014-02-24 | 2014-05-07 | 联想(北京)有限公司 | Charging control method, controller, charger and charging system |
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| CN104467117A (en) * | 2014-12-31 | 2015-03-25 | 展讯通信（上海）有限公司 | Charging method and device and charger |
| CN104467122A (en) * | 2014-12-31 | 2015-03-25 | 展讯通信（上海）有限公司 | Charging method and device, charger, electronic device and electronic equipment |
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