CN201868904U - Novel charger capable of automatically adjusting output according to battery voltage - Google Patents

Novel charger capable of automatically adjusting output according to battery voltage Download PDF

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Publication number
CN201868904U
CN201868904U CN2010205876298U CN201020587629U CN201868904U CN 201868904 U CN201868904 U CN 201868904U CN 2010205876298 U CN2010205876298 U CN 2010205876298U CN 201020587629 U CN201020587629 U CN 201020587629U CN 201868904 U CN201868904 U CN 201868904U
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voltage
output
new
chip
type charge
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顾建良
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Huizhou TCL Mobile Communication Co Ltd
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Huizhou TCL Mobile Communication Co Ltd
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Abstract

The utility model discloses a novel charger capable of automatically adjusting output according to battery voltage, which comprises a traditional charger circuit module, and is characterized by further comprising a voltage reducing chip and a control circuit. The traditional charger circuit module is connected with the voltage reducing chip, the voltage reducing chip is connected with the control circuit, an output end of the voltage reducing chip is a first external port of the novel charger, an input end of the control chip is a second external port of the novel charger, the voltage reducing chip is used for adjusting the output voltage of the traditional charger circuit module to be suitable according to control of the control circuit, and the control circuit is used for detecting electric quantity of a battery in the current state, thereby controlling the voltage reducing chip to adjust the outputted charging voltage. The output voltage can be adjusted automatically according to the current voltage in the battery by the novel charger, and heat generated in charging of a charging circuit is decreased greatly.

Description

A kind of New-type charge device of adjusting output according to cell voltage automatically
Technical field
The utility model relates to electricity field, in particular a kind of New-type charge device of adjusting output voltage according to cell voltage automatically.
Background technology
Along with portable 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, the capacity of present most of battery of mobile phone has all reached more than the 1000mAH, have in addition reached more than the 2000mAH, this charging to mobile phone is also had higher requirement.For jumbo battery, when requiring charging: charging current is big; The charging heating is little; Charging interval is fast.Yet large current charge can cause a large amount of heats to produce, thereby can influence the fail safe and the reliability of mobile phone.Then electric current must be improved but satisfy the fast requirement of charging, therefore the voltage that heat just must reduce to consume on the 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.
The utility model content
The purpose of this utility model is to provide a kind of and adjusts the New-type charge device of output voltage automatically according to cell voltage, is intended to solve existing existing charger for mobile phone, can only export the problem of constant charging voltage.
The technical solution of the utility model is as follows:
A kind ofly adjust the New-type charge device of output automatically according to cell voltage, comprise the conventional charger circuit module, wherein, 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 first external-connected port of described New-type charge device; The input of described control chip is second external-connected port of New-type charge device, 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 used to detect the state of charge under the battery current state, thus the charging voltage of control step-down chip adjustment output.
The described New-type charge device of adjusting output according to cell voltage automatically, connected mode when wherein, described New-type charge device charges to the battery in the portable terminal is: first external-connected port of described New-type charge device connects charging circuit and the power management chip in the portable terminal; Second external-connected port of New-type charge device connects the battery in the described portable terminal; Described charging circuit is connected battery with power management chip, and described charging circuit connects described power management chip.
Describedly adjust the New-type charge device of output automatically according to cell voltage, wherein, on the output of described step-down chip also series connection one inductance is set, the output of inductance is first external-connected port of described New-type charge device.
Describedly adjust the New-type charge device of output automatically according to cell voltage, wherein, described control circuit comprises second resistance, the 3rd resistance, the 4th resistance and the 3rd diode, and wherein, the negative electrode of described the 3rd diode is second external-connected port of New-type charge device; Described 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 the voltage controling input end of step-down chip 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 the output Vin and the sheet choosing end CE of step-down chip, and negative pole connects the earth terminal of step-down chip.
The beneficial effects of the utility model: the utility model is by increasing a step-down chip in traditional charger, this step-down chip can be according to the current voltage in the battery, automatically adjust output voltage, significantly reduce 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 portable terminal that embodiment provides in the utility model;
Fig. 2 is the schematic block circuit diagram that embodiment provides in the utility model New-type charge device charges to battery.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, clear and definite, below the utility model is further described with reference to the accompanying drawing embodiment that develops simultaneously.
The output voltage of traditional charger directly is added on power management chip (PMIC) and the charging circuit.If charger is output as 5V, charging current is 1A, when the residual voltage of battery is 3.5V, the power that then 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 portable 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 big more, and the charging interval is just short more, and charging current is more little, and the charging interval is just long more, so to strengthen charging current be a kind of trend in order to accelerate charging rate.In order to reduce the power consumption of consumption 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 utility model is adjusted the voltage that finally outputs to mobile phone according to current battery 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 portable terminal and New-type charge device, comprises power management chip (PMIC), charging circuit, battery in the described portable terminal; Described New-type charge device 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 first external-connected port of described New-type charge device, and it connects charging circuit and power management chip in the described portable terminal.The input of described control chip is second external-connected port of New-type charge device, and it connects the battery in the described portable 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 to finish the setting of cell-phone charging electric current, and scope can be provided with between 0mA～1.5A, and step-length can be made as 50mA.The output voltage that described step-down chip is used to finish conventional charger is adjusted to suitable size according to the control of control circuit.Described control circuit is used to detect the state of charge under the battery current state, thereby the control step-down chip electric weight current according to battery adjusted the charging voltage that charger is exported.Described charging circuit is used to charge the battery, and major function is to cooperate PMIC to realize the control of charging current and charging voltage.
Its course of work is that charger is connected with portable terminal, exports rectification and step-down voltage afterwards after charger connects electricity, and inserts the step-down chip; The step-down chip is adjusted output voltage automatically according to the detected battery current dump energy of control circuit.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 embodiment provides in the utility model shown in Figure 2 charges to battery, it comprises: the positive pole of conventional charger circuit module connects the 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 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 voltage controling input end Vbf of the anode of the 3rd diode D3, the 3rd resistance R 3 and step-down chip is connected successively; 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, charging voltage is connected to the Vcharge port of power management chip by inductance L 1.
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 a 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 anode that the negative electrode of the described first diode D1, charging detect resistance R 1 and battery is connected successively.The negative electrode of the described 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.
Its metal-oxide-semiconductor Q1 and the first diode D1 and charging detect the overall power consumption of resistance R 1 generally about 0.9W, in order to guarantee the reliability of the metal-oxide-semiconductor and the first diode D1 and 1 work of charging detection resistance R in the conventional portable terminal.With this power reduction 30%, therefore the power that consumes on the charging circuit is 0.6W, if the charging current with 1A is calculated, the voltage sum that then consumes on the metal-oxide-semiconductor and the first diode D1 is 0.6W/1A=0.6V, i.e. Vdisp=0.6V among the figure, that is to say that the voltage sum that will guarantee to consume on metal-oxide-semiconductor and diode D1 can not surpass 0.6V.
The effect of the 3rd diode D3 is in charging among the figure, 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 a voltage controling input end, and the Vcharge that the voltage output of step-down chip U1 is received power management chip by inductance L 1 holds, 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 to control the voltage output of step-down 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:
( V bat + V d ) × R 4 R 3 + R 4 = V fb = V ch arg e K . . . ( 1 )
So, V ch arg e = ( V bat + V d ) × K × R 4 R 3 + R 4 . . . ( 2 )
Because Vd is very little with respect to Vbat, can ignore, so formula (2) can be write as:
V ch arg e = V bat × K × R 4 R 3 + R 4 . . . ( 3 )
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 constant relatively 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 a charging current, only needs to reduce V according to formula (4) Charge-V BatValue, just can realize reducing the power consumption of consumption on metal-oxide-semiconductor and diode, reach the effect that reduces heating.And can get according to formula (3):
V ch arg e - V bat = V bat × ( K × R 4 R 3 + R 4 - 1 ) ,
The resistance of described the 3rd resistance R 3 and the 4th resistance R 4 determines that method is:
V bat max &times; ( K &times; R 4 R 3 + R 4 - 1 ) < A
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 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.It is as follows to derive:
4.2 &times; ( K &times; R 4 R 3 + R 4 - 1 ) < 0.6 V ,
Finally obtain
Figure BSA00000328773900064
Select in the present embodiment Like this, just can be when cell voltage reach maximum, the pressure drop on metal-oxide-semiconductor and the diode is 0.6V to the maximum, under other the cell voltage, can guarantee that pressure drop on metal-oxide-semiconductor and the diode less than 0.6V, so just can guarantee power consumption, reduce caloric value.
Among Fig. 2, also be in series with second resistance R 2 at the anode of the 3rd diode D3 and the output of inductance L 1, described second resistance R 2 is used in charging, and Vbat is connected to Vf by diode with cell voltage.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 second resistance R 2, making and in the charger zero load, can export constant voltage yet.The input voltage of the voltage controling input end of step-down chip is when unloaded:
V ch arg e &times; R 4 R 2 + R 3 + R 4 = V fb ,
And V Charge=K*V Fb,
Therefore can obtain
Figure BSA00000328773900072
According to R3 that obtains 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 ofly adjusts the charger of the output voltage of charger automatically according to cell voltage, the power that is dispersed in well on the 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 utility model is not limited to above-mentioned giving an example; for those of ordinary skills, can be improved according to the above description or conversion, all these improvement and conversion all should belong to the protection range of the utility model claims.

Claims (4)

1. New-type charge device of adjusting output according to cell voltage automatically, 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 first external-connected port of described New-type charge device; The input of described control chip is second external-connected port of New-type charge device, 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 used to detect the state of charge under the battery current state, thus the charging voltage of control step-down chip adjustment output.
2. the New-type charge device of adjusting output according to cell voltage automatically according to claim 1, it is characterized in that the connected mode when described New-type charge device charges to the battery in the portable terminal is: first external-connected port of described New-type charge device connects charging circuit and the power management chip in the portable terminal; Second external-connected port of New-type charge device connects the battery in the described portable terminal; Described charging circuit is connected battery with power management chip, and described charging circuit connects described power management chip.
3. according to claim 1ly adjust the New-type charge device of output automatically, it is characterized in that according to cell voltage, on the output of described step-down chip also series connection one inductance is set, the output of inductance is first external-connected port of described New-type charge device.
4. the New-type charge device of adjusting output according to cell voltage automatically according to claim 1, it is characterized in that, described control circuit comprises second resistance, the 3rd resistance, the 4th resistance and the 3rd diode, and wherein, the negative electrode of described the 3rd diode is second external-connected port of New-type charge device; Described 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 the voltage controling input end of step-down chip 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 the output Vin and the sheet choosing end CE of step-down chip, and negative pole connects the earth terminal of step-down chip.
CN2010205876298U 2010-10-28 2010-10-28 Novel charger capable of automatically adjusting output according to battery voltage Expired - Fee Related CN201868904U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102025174A (en) * 2010-10-28 2011-04-20 惠州Tcl移动通信有限公司 Novel charger capable of automatically regulating output based on voltage of battery
CN110932370A (en) * 2019-12-18 2020-03-27 广东工业大学 Intelligent charging remote controller

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102025174A (en) * 2010-10-28 2011-04-20 惠州Tcl移动通信有限公司 Novel charger capable of automatically regulating output based on voltage of battery
CN102025174B (en) * 2010-10-28 2013-05-15 惠州Tcl移动通信有限公司 Novel charger capable of automatically regulating output based on voltage of battery
CN110932370A (en) * 2019-12-18 2020-03-27 广东工业大学 Intelligent charging remote controller

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Granted publication date: 20110615

Termination date: 20121028