CN102025174B - Novel charger capable of automatically regulating output based on voltage of battery - Google Patents
Novel charger capable of automatically regulating output based on voltage of battery Download PDFInfo
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- CN102025174B CN102025174B CN 201010529086 CN201010529086A CN102025174B CN 102025174 B CN102025174 B CN 102025174B CN 201010529086 CN201010529086 CN 201010529086 CN 201010529086 A CN201010529086 A CN 201010529086A CN 102025174 B CN102025174 B CN 102025174B
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Abstract
The invention discloses a novel charger capable of automatically regulating the output based on the voltage of a battery, which comprises a traditional charger circuit module. The novel charger is characterized by also comprising a voltage-reducing chip and a control circuit, wherein the traditional charger circuit module is connected with the voltage-reducing chip, and the voltage-reducing chip is connected with the control circuit; the output end of the voltage-reducing chip is a first external connection port of the novel charger; the input end of the control chip is a second external connection port of the novel charger; the voltage-reducing chip is used for regulating the output voltage of the traditional charger circuit module to a proper magnitude based on the control of the control circuit; and the control circuit is used for detecting the current electric quantity state of a battery, thereby controlling the voltage-reducing chip to regulate the charging voltage output. By using the invention, the output voltage can be automatically regulated on the basis of the current voltage of the battery, thereby greatly reducing the heat caused by the charging operation of the charging circuit.
Description
Technical field
The present invention relates to electricity field, in particular a kind of New charger of automatically adjusting output voltage according to cell voltage.
Background technology
Along with mobile terminal, mobile phone for example, function more and more abundanter, the user is also more and more higher to the cruising time of battery of mobile phone, caused the continuous lifting of battery of mobile phone capacity, more than the capacity of present most of battery of mobile phone has all reached 1000mAH, have even reached 2000mAH more than, this charging to mobile phone is also had higher requirement.For jumbo battery, when requiring charging: charging current is large; The charging heating is little; Charging interval is fast.Yet large current charge can cause a large amount of heat generations, thereby can affect the safety and reliability of mobile phone.Electric current must be improved but satisfy the fast requirement of charging, therefore the voltage that heat just must reduce to consume on charging circuit will be reduced.And existing charger existence can only be exported constant charging voltage.
Therefore, prior art has yet to be improved and developed.
Summary of the invention
The object of the present invention is to provide a kind of New charger of automatically adjusting output voltage according to cell voltage, be intended to solve existing existing charger for mobile phone, can only export the problem of constant charging voltage.
Technical scheme of the present invention is as follows:
A kind of New charger of automatically adjusting output according to cell voltage comprises the conventional charger circuit module, wherein, also comprises step-down chip and control circuit, and described conventional charger circuit module connects the step-down chip, and described step-down chip connects control circuit; The output of described step-down chip is the first external-connected port of described New charger; The input of described control chip is the second external-connected port of New charger, and described step-down chip is used for the output voltage of conventional charger circuit module is adjusted to suitable size according to the control of control circuit; Described control circuit is for detection of the state of charge under the battery current state, thus the charging voltage of controlled hypotension chip adjustment output.
The described New charger of automatically adjusting output according to cell voltage, connected mode when wherein, described New charger charges to the battery in mobile terminal is: the first external-connected port of described New charger connects charging circuit and the power management chip in mobile terminal; The second external-connected port of New charger connects the battery in described mobile terminal; Described charging circuit is connected battery with power management chip, and described charging circuit connects described power management chip.
The described New charger of automatically adjusting output according to cell voltage wherein, is also connected on the output of described step-down chip an inductance is set, and the output of inductance is the first external-connected port of described New charger.
The described New charger of automatically adjusting output according to cell voltage, wherein, described control circuit comprises the second resistance, the 3rd resistance, the 4th resistance and the 3rd diode, wherein, the negative electrode of described the 3rd diode is the second external-connected port of New charger; Described the second resistance string is associated between the output of the anode of the 3rd diode and inductance; The anode of described the 3rd diode, the 3rd resistance and step-down chip are connected voltage controling input end and are connected successively; Described the 4th resistance string is associated between the voltage controling input end and ground wire of step-down chip; The positive pole of conventional charger circuit module connects output Vin and the sheet choosing end CE of step-down chip, and negative pole connects the earth terminal of step-down chip.
Beneficial effect of the present invention: the present invention is by increasing a step-down chip in traditional charger, this step-down chip can be adjusted output voltage automatically according to the current voltage in battery, greatly reduces charging circuit itself because the heat that charging produces.
Description of drawings
Fig. 1 is the hardware block diagram of the batter-charghing system of the mobile terminal that in the present invention, embodiment provides;
Fig. 2 is the schematic block circuit diagram that New charger that in the present invention, embodiment provides charges to battery.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, clear and definite, developing simultaneously referring to accompanying drawing, the present invention is described in more detail for embodiment.
The output voltage of traditional charger directly is added on power management chip (PMIC) and charging circuit.If charger is output as 5V, charging current is 1A, when the residual voltage of battery is 3.5V, the power that consumes on charging circuit is (5-3.5) V*1A=1.5W, for mobile phone, 1.5W is the output of sizable heat, and the device of charging circuit has been proposed more powerful requirement.Need to select more powerful metal-oxide-semiconductor and diode.Therefore the cost of mobile terminal can rise, and along with the lifting of power, also can strengthen equally board area, and LAYOUT has also been proposed very high requirement.
Because charging current is directly connected to the charging interval of battery, charging current is larger, and the charging interval is just shorter, and charging current is less, and the charging interval is just longer, so be a kind of trend in order to accelerate charging rate increasing charging current.In order to reduce the power consumption that consumes on charging circuit, as long as reduce the voltage that consumes on this circuit.And the output voltage of conventional charger is constant, so the present invention adjusts the voltage that finally outputs to mobile phone according to current cell voltage automatically by increased a step-down chip and control circuit in the output of conventional charger.
Referring to Fig. 1, cell phone battery charge system comprises mobile terminal and New charger, and described mobile terminal comprises power management chip (PMIC), charging circuit, battery; Described New charger comprises conventional charger circuit module, step-down chip and control circuit.Described conventional charger circuit module connects the step-down chip, and described step-down chip connects control circuit; The output of described step-down chip is the first external-connected port of described New charger, and it connects charging circuit and power management chip in described mobile terminal.The input of described control chip is the second external-connected port of New charger, and it connects the battery in described mobile terminal.Described charging circuit is connected battery with power management chip, and described charging circuit connects described power management chip.
Described power management chip PMIC is used for completing the setting of cell-phone charging electric current, and scope can arrange between 0mA～1.5A, and step-length can be made as 50mA.Described step-down chip is used for completing the output voltage of conventional charger is adjusted to suitable size according to the control of control circuit.Described control circuit is for detection of the state of charge under the battery current state, thereby the controlled hypotension chip electric weight current according to battery adjusted the charging voltage that charger is exported.Described charging circuit is used for charging the battery, and major function is to coordinate PMIC to realize the control of charging current and charging voltage.
Its course of work is that charger is connected with mobile terminal, exports rectification and step-down voltage afterwards after charger connects electricity, and access step-down chip; The current dump energy of the battery that the step-down chip detects according to control circuit is adjusted output voltage automatically.Power management chip is according to the charging current of the voltage control charging circuit of step-down chip output.
The schematic block circuit diagram that the charger for mobile phone that in the present invention shown in Figure 2, embodiment provides charges to battery, it comprises: the positive pole of conventional charger circuit module connects output Vin and the sheet choosing end CE of step-down chip, and negative pole connects the earth terminal GND of step-down chip.The voltage controling input end Vbf of step-down chip connects control circuit, described control circuit comprises the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4 and the 3rd diode D3, the negative electrode of described the 3rd diode D3 connects the anode of battery, and the anode of the 3rd diode D3, the 3rd resistance R 3 are connected voltage controling input end Vbf and are connected successively with the step-down chip; Described the 4th resistance R 4 is connected between the voltage controling input end Vbf and ground wire of step-down chip.The output Lx of described step-down chip connects inductance L 1, by inductance L 1, charging voltage is connected to the Vcharge port of power management chip.
Described charging circuit comprises that metal-oxide-semiconductor Q1, the first diode D1 and charging detect resistance R 1, described metal-oxide-semiconductor Q1 is P type metal-oxide-semiconductor, its source electrode connects the Vcharge port of power management chip, its drain electrode connects the anode of the first diode D1, and its grid is connected to the GATE-CTRL port of power management chip.The negative electrode of described the first diode D1, charging detect resistance R 1 is connected anode and connects successively with battery.The negative electrode of described the first diode D1 also connects the protection pin ISENSE port of power management chip; The anode of battery also is connected to the VBAT port of power management chip.
The overall power consumption that in conventional mobile terminal, its metal-oxide-semiconductor Q1 and the first diode D1 and charging detect resistance R 1 detects the reliability of resistance R 1 work generally in the 0.9W left and right in order to guarantee metal-oxide-semiconductor and the first diode D1 and charging.With this power reduction 30%, therefore the power that consumes on charging circuit is 0.6W, if the charging current with 1A is calculated, the voltage sum that consumes on metal-oxide-semiconductor and the first diode D1 is 0.6W/1A=0.6V, i.e. Vdisp=0.6V in figure, that is to say, the voltage sum that guarantee to consume on metal-oxide-semiconductor and diode D1 can not surpass 0.6V.
In figure, the effect of the 3rd diode D3 is in charging, and the voltage of battery is received Vf, so Vf=Vbat+Vd, and wherein Vd is the pressure drop of the 3rd diode D3, is generally 0.3V.The Vfb of step-down chip U1 is voltage controling input end, and the Voltage-output of step-down chip U1 is received the Vcharge end of power management chip by inductance L 1, and the output voltage V charge of step-down chip is controlled by the input voltage Vfb of voltage controling input end, i.e. V
Charge=K*V
fb, wherein K is the voltage coefficient of U1, is a constant.To receive the Vfb of step-down chip U1 after the Vf dividing potential drop, be used for the Voltage-output of controlled hypotension chip U1.And the output voltage V charge of step-down chip should be Vbat+Vdisp according to top calculating.Therefore following formula is arranged:
So,
Because Vd is very little with respect to Vbat, can ignore, so formula (2) can be write as:
Therefore can obtain V according to formula (2)
ChargeAnd V
batBetween relation, in order to guarantee the safe and reliable of cell-phone charging, we only need to set suitable R
3And R
4Get final product, just can make V
ChargeAnd V
batBetween keep a relatively constant ratio.And finally consume power consumption P on metal-oxide-semiconductor and diode
DispFor:
P
disp＝(V
charge-V
bat)×I............................................(4)
Wherein I is charging current, only needs to reduce V according to formula (4)
Charge-V
batValue, just can realize reducing the power consumption that consumes on metal-oxide-semiconductor and diode, reach the effect that reduces heating.And can get according to formula (3):
The resistance of described the 3rd resistance R 3 and the 4th resistance R 4 determines that method is:
Wherein, V
Bat maxBe the maximum voltage of battery, K is the voltage coefficient of step-down chip, R
3And R
4Be respectively the resistance of the third and fourth resistance, A is the maximum pressure drop that charging circuit is set.
For example, and for guarantee to consume voltage on charging circuit be less than 0.6V be pressure drop A less than 0.6V, be 4.2V to the maximum with Vbat to calculate, just can obtain the ratio of R4 and R3.Derive as follows:
Finally obtain
Select in the present embodiment
Like this, just can be when cell voltage reach maximum, the pressure drop on metal-oxide-semiconductor and diode is 0.6V to the maximum, under other cell voltage, can guarantee that pressure drop on metal-oxide-semiconductor and diode less than 0.6V, so just can guarantee power consumption, reduce caloric value.
In Fig. 2, also be in series with the second resistance R 2 at the anode of the 3rd diode D3 and the output of inductance L 1, described the second resistance R 2 is used in charging, cell voltage Vbat being connected to Vf by diode.And do not charging, be i.e. in the time of charger zero load, the output voltage V charge of step-down chip be connected on the feedback line of step-down chip U1 by the second resistance R 2, making in the charger zero load and can export constant voltage yet.When unloaded, the input voltage of the voltage controling input end of step-down chip is:
And V
Charge=K*V
fb,
Therefore can obtain
According to R3 obtained above and R4, just can calculate the size of the value of R2, that is:
R
2＝(K-1)×R
4-R
3。
This programme has designed a kind of charger of automatically adjusting the output voltage of charger according to cell voltage, the power that is dispersed in well on cell phone charging circuit can be reduced to certain limit, can guarantee that also the electric current that charges is constant simultaneously.
Should be understood that, application of the present invention is not limited to above-mentioned giving an example, and for those of ordinary skills, can be improved according to the above description or conversion, and all these improve and conversion all should belong to the protection range of claims of the present invention.
Claims (4)
1. New charger of automatically adjusting output according to cell voltage, comprise the conventional charger circuit module, it is characterized in that, also comprise step-down chip and control circuit, described conventional charger circuit module connects the step-down chip, and described step-down chip connects control circuit; The output of described step-down chip is the first external-connected port of described New charger; The input of described control circuit is the second external-connected port of New charger, and described step-down chip is used for the output voltage of conventional charger circuit module is adjusted to suitable size according to the control of control circuit; Described control circuit is for detection of the state of charge under the battery current state, thus the charging voltage of controlled hypotension chip adjustment output;
Also connect on the output of described step-down chip an inductance is set, the output of inductance is the first external-connected port of described New charger;
Described control circuit comprises the second resistance, the 3rd resistance, the 4th resistance and the 3rd diode, and wherein, the negative electrode of described the 3rd diode is the second external-connected port of New charger; Described the second resistance string is associated between the output of the anode of the 3rd diode and inductance; The anode of described the 3rd diode, the 3rd resistance and step-down chip are connected voltage controling input end and are connected successively; Described the 4th resistance string is associated between the voltage controling input end and ground wire of step-down chip; The positive pole of conventional charger circuit module connects output Vin and the sheet choosing end CE of step-down chip, and negative pole connects the earth terminal of step-down chip.
2. the New charger of automatically adjusting output according to cell voltage according to claim 1, it is characterized in that, the connected mode when described New charger charges to the battery in mobile terminal is: the first external-connected port of described New charger connects charging circuit and the power management chip in mobile terminal; The second external-connected port of New charger connects the battery in described mobile terminal; Described charging circuit is connected battery with power management chip, and described charging circuit connects described power management chip.
3. the New charger of automatically adjusting output according to cell voltage according to claim 1, is characterized in that, the resistance of described the 3rd resistance and the 4th resistance determines that formula is:
Wherein, V
BatmaxMaximum voltage for battery; K is constant, is the voltage coefficient of step-down chip; R
3And R
4Be respectively the resistance of the third and fourth resistance; A is the maximum pressure drop that charging circuit is set.
4. the New charger of automatically adjusting output according to cell voltage according to claim 3, is characterized in that, the resistance of described the second resistance determines that formula is:
Wherein, R
2It is the resistance of the second resistance; R
3And R
4Be respectively the resistance of the third and fourth resistance; K is constant, is the voltage coefficient of step-down chip.
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| CN102280670B (en) * | 2011-07-06 | 2014-07-09 | 惠州Tcl移动通信有限公司 | Charging method for realizing automatic power control |
| CN103647318B (en) * | 2013-12-04 | 2016-03-02 | 华为终端有限公司 | Communicating terminal, charge control method, device and circuit |
| CN107005075A (en) * | 2015-08-28 | 2017-08-01 | 华为技术有限公司 | Charging method and electronic equipment |
| CN106058974A (en) * | 2016-06-16 | 2016-10-26 | 青岛海信移动通信技术股份有限公司 | Mobile terminal and charging system |
| CN109038735A (en) * | 2018-08-09 | 2018-12-18 | 浙江大华技术股份有限公司 | A kind of charge control method, apparatus and system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201341034Y (en) * | 2009-01-19 | 2009-11-04 | 路华科技(深圳)有限公司 | Notebook battery charger |
| CN201440614U (en) * | 2009-06-26 | 2010-04-21 | 比亚迪股份有限公司 | Charge control circuit |
| CN201590668U (en) * | 2009-10-22 | 2010-09-22 | 中兴通讯股份有限公司 | A charging device for mobile terminal |
| CN201868904U (en) * | 2010-10-28 | 2011-06-15 | 惠州Tcl移动通信有限公司 | Novel charger capable of automatically adjusting output according to battery voltage |
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| US20080290840A1 (en) * | 2007-05-21 | 2008-11-27 | Symbol Technologies, Inc. | Power dissipation limiting for battery chargers |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201341034Y (en) * | 2009-01-19 | 2009-11-04 | 路华科技(深圳)有限公司 | Notebook battery charger |
| CN201440614U (en) * | 2009-06-26 | 2010-04-21 | 比亚迪股份有限公司 | Charge control circuit |
| CN201590668U (en) * | 2009-10-22 | 2010-09-22 | 中兴通讯股份有限公司 | A charging device for mobile terminal |
| CN201868904U (en) * | 2010-10-28 | 2011-06-15 | 惠州Tcl移动通信有限公司 | Novel charger capable of automatically adjusting output according to battery voltage |
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