CN101728840A - Charger for quick charge - Google Patents

Abstract

A charger capable of quickly charging a battery device comprises a voltage stabilizer, a controller and a compensation adjustment unit. The voltage stabilizer supplies a charge current to the battery device. The controller is coupled to the voltage stabilizer for controlling the charge current output by the voltage stabilizer. The compensation adjustment unit is coupled to the voltage stabilizer and the battery device for receiving a first reference voltage. When entering a first operating mode, the compensation adjustment unit outputs the first reference voltage to the voltage stabilizer. When entering a second operating mode, the controller commands the voltage stabilizer to generate first and second charge currents at one moment, the output voltages of the corresponding battery device are first and second output voltages respectively, and the compensation adjustment unit estimates the resistance value of a parasitic resistor of the battery device by detecting the first and second output voltages so as to compensate the first reference voltage.

Description

The charger of quick charge

Technical field

The present invention relates to a kind of battery charger of tool high charge speed, particularly relate to and a kind ofly can measure the high speed battery charger of the internal resistance of cell automatically to compensate.

Background technology

Along with the development of portable type electronic product with in vogue, low power consumption and high efficiency become the overriding concern of portable type electronic product.And these utilize battery to provide the electronic circuit of power supply to must operate at low-voltage and low current to reduce power consumption, make battery be lengthened working hours.Therefore efficient power management has become one of key factor of design of electronic circuits.

In order to reduce power consumption, pressurizer often is used to reduce operating voltage, and higher input voltage is converted to the circuit use of lower voltage for other.The mode of voltage transitions roughly is divided into: switching type voltage stabilizer, DC-to-DC voltage adjuster and three kinds of frameworks of linear voltage regulator.(Low Dropout, LDO) linear voltage regulator becomes more important at portable type electronic product flourish today linear voltage regulator with low pressure drop again.The advantage of low-voltage-drop linear voltage regulator be output voltage to the reacting condition of input voltage or load comparatively rapidly, the ripple of output voltage is with noise is lower, circuit structure is simple, volume is less and price is comparatively cheap or the like.And, become main flow in recent years more because of the lifting of its conversion efficiency.

Shown in Figure 1A, low-voltage-drop linear voltage regulator 100 comprises: transfer element 110, divider resistance 120 and 130, amplifier 140.Transfer element 110 can be a transistor (shown in Figure 1A), and its grid is coupled to the output of amplifier 140, and its source electrode is coupled to an input voltage Vi, and its drain electrode is coupled to an end of divider resistance 120, and the voltage of its drain electrode is output voltage V o.The other end of divider resistance 120 is coupled to the non-inverting input of amplifier 140.One end of divider resistance 130 also is coupled to the non-inverting input of amplifier 140, the other end ground connection of divider resistance 130.The inverting input of amplifier 140 couples a reference voltage Vr.

And when using low-voltage-drop linear voltage regulator when charger is inner, battery packages (BatteryPack) 150 can be modeled to a dead resistance 151 and battery 152.And battery 152 is with an electric capacity symbolic representation in Figure 1A, and the charging current of the cell apparatus of flowing through is I _CHAnd the change of its charge mode can be explained by Figure 1B, low-voltage-drop linear voltage regulator 100 can be charged to the first predetermined voltage Vp1 with little current-mode (Trickle Mode) with battery packages 150 earlier at the beginning, switches to constant current mode (Constant Current Mode) charging again.When the voltage of battery packages 150 is charged to the second predetermined voltage Vp2, promptly enter constant voltage mode (Constant Voltage Mode), again with battery packages 150 voltage stabilizings at the second predetermined voltage Vp2.

Yet this kind charging modes has a big shortcoming, promptly when the two ends of battery packages 150 have reached the second predetermined voltage Vp2 (that is, when having reached the second predetermined voltage Vp2 by battery packages 150 outside detected voltages), the virtual voltage of battery 152 does not still reach the second predetermined voltage Vp2 as yet.So, at this moment, the real voltage V of battery 152 _BBe that the second predetermined voltage Vp2 deducts the pressure drop (also can be described as current resistor voltage drop (IR Drop)) on the dead resistance 151.In order to make battery 152 can accurately be charged to the second predetermined voltage Vp2, after entering constant voltage mode, charger still can be with a charging current I who reduces gradually _CHProceed charging, up to this charging current I _CHJust finish the charging behavior less than a particular value back.So the size of current resistor voltage drop has determined the length in final charging interval.

In order to improve this shortcoming, traditional charging circuit figure of script Figure 1A is changed into as shown in Figure 2.In the charging circuit figure of Fig. 2, inductive reactance 160 and 170 have been added. Divider resistance 120 and 130 resistance value are respectively R ₁₂₀With R ₁₃₀, inductive reactance 160 and 170 resistance value are respectively R ₁₆₀With R ₁₇₀, and the electric current of the battery packages 150 of flowing through is I _CHThe time, then output voltage V o can following formula shown in:

$\mathrm{Vo}=\mathrm{Vr}\&times;(1+\frac{R_{120}}{R_{130}}+\frac{R_{120}}{R_{160}})+I_{\mathrm{CH}}\&times;{\mathrm{<figure-callout\; id="170"\; label="R"\; filenames="H2008101690827E0000021.png"\; state="\{\{state\}\}">R</figure-callout>}}_{170}\&times;\frac{R_{120}}{R_{160}}---\left(1\right)$

This formula (1) meets two boundary conditions, in electric current I _CHWhen being zero, Vo equals the second predetermined voltage Vp2; In electric current I _CHDuring for maximum, Vo equals the current resistor potential drop that the second predetermined voltage Vp2 adds required compensation.Utilize such charge mode, when charger is transformed into constant voltage mode, will reduce the voltage of battery 152 and the error between the second predetermined voltage Vp2.

Yet charging circuit shown in Figure 2 still has a shortcoming, promptly must record the resistance value of the dead resistance 151 of battery packages 150 earlier, again according to maximum charging current I _CHObtain the current resistor voltage drop.So, just can utilize above-mentioned formula (1) to try to achieve the resistance value R of divider resistance 120,130 and inductive reactance 160,170 ₁₂₀, R ₁₃₀With R ₁₆₀, R ₁₇₀But, different battery packages, its dead resistance also can be different, so can cause the resistance value R of inductive reactance 160,170 ₁₆₀, R ₁₇₀Uncertainty, make the usefulness of charging to promote.

Summary of the invention

The invention provides a kind of charger, the dead resistance that is applicable to the preestimating battery device so can add the speed of charging quickly to compensate, and promotes the usefulness of charging.

The invention provides a kind of charger, this charger comprises low-voltage-drop linear voltage regulator, controller and compensation adjustment unit.Low-voltage-drop linear voltage regulator provides charging current to cell apparatus.Controller is coupled to low-voltage-drop linear voltage regulator, in order to control the charging current that low-voltage-drop linear voltage regulator is exported.The compensation adjustment unit is coupled to low-voltage-drop linear voltage regulator and cell apparatus, and the compensation adjustment unit receives first reference voltage.

Wherein when entering first operator scheme, first reference voltage is exported to low-voltage-drop linear voltage regulator in the compensation adjustment unit.When entering second operator scheme, controller makes low-voltage-drop linear voltage regulator produce first charging current and second charging current in a flash, in response to first charging current and second charging current, the output voltage of cell apparatus is respectively first output voltage and second output voltage, the resistance value of compensation adjustment unit dead resistance of preestimating battery device by detecting first output voltage and second output voltage is in order to compensate first reference voltage.

According to embodiments of the invention, the compensation adjustment unit comprises: voltage compensation unit and voltage position contrast are put in order the unit.The voltage compensation unit is coupled to low-voltage-drop linear voltage regulator, and the output signal of voltage compensation unit is relevant for the difference between first output voltage and second output voltage.Contrast whole unit in voltage position receives the output signal of voltage compensation unit to compensate first reference voltage.

According to embodiments of the invention, contrast whole unit in voltage position comprises: voltage current adapter, anti-phase chain, digital current source and voltage accumulation device.Voltage current adapter is coupled to the voltage compensation unit, is converted to first electric current in order to the output signal with the voltage compensation unit.The reverse transfer chain is coupled to voltage current adapter, in order to being digital code with first current conversion.The digital current source is coupled to the reverse transfer chain, in order to determine second electric current according to digital code.And the voltage accumulation unit is coupled to the digital current source, and bucking voltage is exported according to second electric current in the voltage accumulation unit, and bucking voltage is used to compensate first reference voltage.

According to embodiments of the invention, wherein the voltage accumulation unit comprises: operational amplifier and resistance.Operational amplifier has first input end, second input and output.First input end is coupled to first reference voltage.Second input is coupled to output.Resistance one termination is received second electric current and the other end is coupled to the output of operational amplifier, and bucking voltage is relevant to ohmically voltage drop.

In sum, because charger that the embodiment of the invention proposed can calculate the resistance value size of the dead resistance of cell apparatus, and then the current resistor potential drop of obtaining dead resistance is to compensate.So the charger that the embodiment of the invention provided can accurately be charged to specific voltage with the battery in the cell apparatus, to promote the usefulness of charging.And the charger that the embodiment of the invention provided can be accelerated the speed that battery is charged to specific voltage, to reduce the required consumed time of charging.

For above-mentioned feature and advantage of the present invention can be become apparent, preferred embodiment cited below particularly, and be described with reference to the accompanying drawings as follows.

Description of drawings

Figure 1A shows the schematic diagram of conventional charger.

Figure 1B shows the curve chart of charge mode.

Fig. 2 shows the schematic diagram that improves conventional charger.

Fig. 3 shows the equivalent circuit diagram of cell apparatus.

The charger that provides according to the embodiment of the invention and the charging schematic diagram of cell apparatus are provided Fig. 4 A.

The circuit diagram of the low-voltage-drop linear voltage regulator that provides according to the embodiment of the invention is provided Fig. 4 B.

The circuit diagram of the compensation adjustment unit that provides according to the embodiment of the invention is provided Fig. 4 C.

The circuit block diagram of the whole unit of voltage position contrast that provides according to the embodiment of the invention is provided Fig. 4 D.

The voltage current adapter that provides according to the embodiment of the invention and the circuit diagram of anti-phase chain are provided Fig. 4 E.

The circuit diagram in the digital current source that provides according to the embodiment of the invention is provided Fig. 4 F.

The circuit diagram of the voltage accumulation unit that provides according to the embodiment of the invention is provided Fig. 4 G.

Fig. 5 A shows the characteristic curve diagram of charging current.

Fig. 5 B shows the characteristic curve diagram of cell apparatus both end voltage and battery both end voltage.

The circuit diagram of the voltage compensation unit that provides according to the embodiment of the invention is provided Fig. 6.

The reference numeral explanation

100: low-voltage-drop linear voltage regulator

110: transfer element

120,130: divider resistance

140: amplifier

150: battery packages

151: dead resistance

152: battery

160,170: inductive reactance

Vi: input voltage

Vo: output voltage

I _CH: charging current

Vr: reference voltage

V _B: the voltage at battery two ends

Vp1: first predetermined voltage

Vp2: second predetermined voltage

300: cell apparatus

310: dead resistance

320: battery

400: charger

500: low-voltage-drop linear voltage regulator

510: operational amplifier

511: non-oppisite phase end

512: end of oppisite phase

513: amplifier out

520: switch

521: the switch control end

522: switch input terminal

523: output switching terminal

530: the first divider resistances

540: the second divider resistances

Vref: reference voltage

Vref ': reference voltage

I: charging current

VIN: input voltage

VOUT: output voltage

600: the compensation adjustment unit

610: the voltage compensation unit

620: voltage position contrast is put in order the unit

V1: detected output voltage for the first time

V2: detected output voltage for the second time

K (V1-V2): first bucking voltage

630: voltage current adapter

V _In12: the input of voltage current adapter

Ic: first offset current

640: the reverse transfer chain

SW_CTL: digital code

650: the digital current source

I _D: electric current

660: the voltage accumulation device

664: the first operational amplifiers

665: the first non-inverting inputs

666: the first inverting inputs

667: the first outputs

668: resistance adds up

Δ V: voltage adds up

I1: detected charging current for the first time

I2: detected charging current for the second time

Vp: specific voltage

R _P1, R _P2: resistance

N: constant

Embodiment

Following narration will describe embodiment proposed by the invention in detail in conjunction with the diagram that is accompanied by embodiment.The same or analogous reference number that uses in each diagram is to be used for narrating same or analogous part.

General cell apparatus also has many dead resistances, as the internal resistance of cell, contact resistance or the like in cell apparatus except battery.As shown in Figure 3, can become dead resistance 310 and battery 320 to cell apparatus 300 equivalent simulations.In Fig. 3, battery 320 electric capacity symbolic representation.When electric current charges to cell apparatus 300, can on dead resistance 310, form the current resistor voltage drop.So equivalent measures the pressure drop at cell apparatus 300 two ends when being specific voltage Vp, the pressure drop at battery 320 two ends is deducted current resistor voltage drop on the dead resistance 310 for specific voltage Vp.Battery 320 in order to ensure 300 li of cell apparatus is charged to specific voltage Vp, must return the current resistor voltage-drop compensation on the dead resistance 310 of 300 li of cell apparatus.

Fig. 4 A is depicted as according to the charger of the embodiment of the invention schematic diagram to cell apparatus 300 chargings.Charger 400 comprises: low-voltage-drop linear voltage regulator 500, compensation adjustment unit 600 and controller 700.Low-voltage-drop linear voltage regulator 500 receives input voltage VIN, when charger 400 operations, provides output voltage VO UT to cell apparatus 300, and produces the charging current I of the cell apparatus 300 of flowing through.Controller 700 is coupled to low-voltage-drop linear voltage regulator 500, in order to size and the change charging mode of control charging current I.

Compensation adjustment unit 600 receives reference voltage Vref.Compensation adjustment unit 600 is in order to the variation that detects the output voltage VO UT that charging current I caused that moment changes (be V1, V2, the definition of V1 and V2 will in beneath explanation).Compensation adjustment unit 600 calculates the resistance value size of dead resistance 310 by the instantaneous variation (the charging current I that is changed by moment is caused) of detected output voltage VO UT.Compensation adjustment unit 600 produces another reference voltage Vref according to the resistance value size of the dead resistance 310 that calculates ' give low-voltage-drop linear voltage regulator 500, in order to the current resistor voltage drop on the compensation dead resistance 310.Meaning promptly, under constant current mode, when resistance value when size that detects dead resistance 310, then with reference voltage Vref ' export to low-voltage-drop linear voltage regulator 500.So, can make the voltage at battery 320 two ends reach specific voltage Vp fast.

The circuit diagram of the low-voltage-drop linear voltage regulator 500 that provides according to the embodiment of the invention is provided Fig. 4 B, and this is a kind of execution mode of low-voltage-drop linear voltage regulator, but is not in order to limit the present invention.Low-voltage-drop linear voltage regulator 500 comprises: operational amplifier 510, switch 520, first divider resistance 530 and second divider resistance 540.Operational amplifier 510 has non-oppisite phase end 511, end of oppisite phase 512 and amplifier out 513.Wherein end of oppisite phase 512 is coupled to compensation adjustment unit 600, in order to receive reference voltage Vref '.

Switch 520 has switch control end 521, switch input terminal 522 and output switching terminal 523.Switch control end 521 couples the amplifier out 513 of operational amplifier 510.Switch input terminal 522 is in order to receive input voltage VIN.Output switching terminal 523 is in order to providing output voltage VO UT to cell apparatus 300, and produces the charging current I of the cell apparatus 300 of flowing through.

And switch 520 can be a transistor (shown in Fig. 4 B).The control end 521 of switch 520 is transistorized grid, and the input 522 of switch 520 is a transistor drain, and the output 523 of switch 520 is transistorized source electrode, yet transistor is a kind of execution mode of switch 520, is not in order to restriction the present invention.First divider resistance, 530 1 ends are coupled to output switching terminal 523, and its other end is coupled to the non-oppisite phase end 511 of operational amplifier 510.Second divider resistance, 540 1 ends are coupled to the non-oppisite phase end 511 of operational amplifier 510, its other end ground connection.

The circuit diagram of the compensation adjustment unit 600 that provides according to the embodiment of the invention is provided Fig. 4 C.Compensation adjustment unit 600 comprises: voltage compensation unit 610 and the whole unit 620 of voltage position contrast.Voltage compensation unit 610 is in order to the variation of the output voltage VO UT that charging current I caused of detection moment change.Voltage compensation unit 610 is by the instantaneous variation (the charging current I that is changed by moment is caused) of detected output voltage VO UT, calculate the resistance value size of dead resistance 310, produce first a bucking voltage K (V1-V2) that can compensate the current resistor potential drop on the dead resistance 310 (K is a constant, will in explained later).

The whole unit 620 of voltage position contrast be coupled to voltage compensation unit 610 and low-voltage-drop linear voltage regulator 500 between, in order to the reception reference voltage Vref.The whole unit 620 of voltage position contrast is 610 receptions, the first bucking voltage K (V1-V2) from the voltage compensation unit again, with first bucking voltage K (V1-V2) superposition on reference voltage Vref, produce reference voltage Vref ' give low-voltage-drop linear voltage regulator 500, in order to the 310 formed current resistor voltage drops of compensation dead resistance.

The voltage position contrast that Fig. 4 D is depicted as the embodiment of the invention to be provided is put in order the circuit block diagram of unit 620.Contrast whole unit 620 in voltage position comprises: voltage current adapter 630, anti-phase chain 640, digital current source 650 and voltage accumulation device 660.Voltage current adapter 630 is coupled to voltage compensation unit 610, in order to the first bucking voltage K (V1-V2) is converted to the first offset current Ic.Anti-phase chain 640 is coupled to voltage current adapter 630, in order to the first offset current Ic is converted to digital code SW_CTL.

A kind of execution mode of the voltage current adapter that provides according to the embodiment of the invention 630 and anti-phase chain 640 is provided Fig. 4 E, but is not in order to limit the present invention.By shown in Fig. 4 E as can be known, the first bucking voltage K (V1-V2) is by the V among Fig. 4 E _In12The input, and digital code SW_CTL is the SW_CTL[0 among Fig. 4 E], SW_CTL[1] or the like.And other elements of voltage current adapter 630 and anti-phase chain 640 couple relation shown in Fig. 4 E, so just seldom give unnecessary details at this.

Though the resistance value of the dead resistance 310 of each cell apparatus 300 is neither all can be within the specific limits with, resistance value, so the first bucking voltage K (V1-V2), the first offset current Ic and digital code SW_CTL also can be within the specific limits.And transferring the first offset current Ic to by voltage current adapter 630, the first bucking voltage K (V1-V2) drives anti-phase chain 640.Because the passing time of the first offset current Ic and signal is inversely proportional to, thereby the first different offset current Ic causes the delay variance of anti-phase chain 640 can determine different digital code SW_CTL, and the digital code SW_CTL that obtains just can control and will compensate dead resistance 310 formed current resistor voltage drops.

Digital current source 650 is coupled to reverse transfer chain 640, in order to the digital code SW_CTL decision electric current I that is produced according to reverse transfer chain 640 _DSize.A kind of execution mode in the digital current source 650 that provides according to the embodiment of the invention is provided Fig. 4 F, but is not in order to limit the present invention.The relation that couples of digital current source 650 its inner members is shown in Fig. 4 F, so just seldom give unnecessary details at this.

Voltage accumulation unit 660 be coupled to digital current source 650 and low-voltage-drop linear voltage regulator 500 between, in order to receive reference voltage Vref.Voltage accumulation device 660 is the 650 received current I from the digital current source again _D, and according to electric current I _DProduce reference voltage Vref ' give low-voltage-drop linear voltage regulator 500, in order to the 310 formed current resistor voltage drops of compensation dead resistance.

A kind of execution mode of the voltage accumulation unit 660 that provides according to the embodiment of the invention is provided Fig. 4 G, but is not in order to limit the present invention.Voltage accumulation unit 660 comprises: first operational amplifier 664 and the resistance 668 that adds up.First operational amplifier 664 has first non-inverting input 665, first inverting input 666 and first output 667.First non-inverting input 665 is in order to receive reference voltage Vref.First inverting input 666 is coupled to first output 667.

The end of resistance 668 of adding up is coupled to digital current source 650 and low-voltage-drop linear voltage regulator 500, and the other end of the resistance 668 that adds up is coupled to first output 667.Resistance 668 is coupled to digital current source 650, electric current I owing to add up _DThe resistance 668 that adds up of flowing through, and form the voltage Δ V that adds up at resistance 668 two ends of adding up.And the resistance 668 that adds up is coupled to low-voltage-drop linear voltage regulator 500, so the voltage that low-voltage-drop linear voltage regulator 500 receives adds reference voltage Vref for the voltage Δ V that adds up, that is reference voltage Vref ' voltage Δ V adds reference voltage Vref in order to add up.

And compensation adjustment unit 600 calculates the mode of dead resistance 310 and can be explained by Fig. 5 A and Fig. 5 B.Please refer to Fig. 4 A, Fig. 5 A and Fig. 5 B, when under constant current mode (shown in Fig. 5 A, the value of the charging current I under constant current mode is I1), controller 700 downgrades charging current I a little fast, forms to transfer to I2 by I1 shown in Fig. 5 A.Because charging current I downgrades fast, and the effect of battery 320 when charging is similar to the effect of an electric capacity, so the voltage at battery 320 two ends is almost constant and can be considered constant Vcons in this small time.And the output voltage VO UT when charging current I is I1 is V1 as can be known by Fig. 5 B, and the output voltage VO UT when charging current I is I2 is V2 as can be known by Fig. 5 B.The resistance value of supposing dead resistance 310 is R, can get following formula:

V1=I1R+Vcons (2) with

V2＝I2·R+Vcons (3)

Can push away to such an extent that the formula of R is as follows by above two formula:

$R=\frac{V2-V1}{I2-I1}---\left(4\right)$

Therefore, as long as know V1, V2, I1 and I2, just can obtain the resistance value R of dead resistance 310.And the current resistor voltage drop I1 * R on the dead resistance 310 also can obtain.(resistance value of first divider resistance 530 is R1 by first divider resistance 530 of low-voltage-drop linear voltage regulator 500 and the relation of second divider resistance 540, the resistance value of second divider resistance is R2), the first bucking voltage K (V1-V2) of the current resistor voltage drop I1 * R on the compensation dead resistance 310 is as follows:

$K(V1-V2)=I1\&times;R\&times;\frac{R2}{\mathrm{<figure-callout\; id="1"\; label="R"\; filenames="H2008101690827E0000011.png,H2008101690827E0000012.png"\; state="\{\{state\}\}">R</figure-callout>}1+R2}$

$=I1\&times;\frac{V1-V2}{I1-I2}\&times;\frac{R2}{\mathrm{<figure-callout\; id="1"\; label="R"\; filenames="H2008101690827E0000011.png,H2008101690827E0000012.png"\; state="\{\{state\}\}">R</figure-callout>}1+R2}---\left(5\right)$

In the following formula,

Value be K.

So voltage compensation unit 610 can be the P compensator, and the value K (V1-V2) of first bucking voltage is calculated.A kind of execution mode of the voltage compensation unit 610 that provides according to the embodiment of the invention is provided, it is the P compensator, but this execution mode is not in order to limit the present invention.And the relation that couples of voltage compensation unit 610 its inner members as shown in Figure 6, so just seldom give unnecessary details at this.As shown in Figure 6, output voltage V 1 and V2 input voltage compensation unit 610 produce the first bucking voltage K (V1-V2) as follows:

$K(V1-V2)=\frac{(V1-V2)}{{\mathrm{<figure-callout\; id="1"\; label="R\; P"\; filenames="H2008101690827E0000011.png,H2008101690827E0000012.png"\; state="\{\{state\}\}">R</figure-callout>}}_P}\&times;N\&times;R_{P2}---\left(6\right)$

With among Fig. 6

Be designed to K, like this then finish the calculating of dead resistance 310, and the first bucking voltage K (V1-V2) that can compensate the current resistor voltage drop on the dead resistance 310 calculates.

The first bucking voltage K (V1-V2) produces reference voltage Vref via the operation of the whole unit 620 of voltage position contrast ' to low-voltage-drop linear voltage regulator 500.Via the operation of low-voltage-drop linear voltage regulator 500, the voltage at charging device 300 two ends can be charged to specific voltage Vp and add dead resistance 310 formed current resistor voltage drops again, and the voltage at battery 320 two ends can be charged to specific voltage Vp.So, can make charger 400 delay and enter constant voltage mode, and the charging interval of prolongation constant current mode reduces the influence of dead resistance 310 formed current resistor voltage drops, and then accelerate charging rate.

In sum, because charger that the embodiment of the invention proposed can calculate the resistance value size of the dead resistance of cell apparatus, and then obtain the current resistor voltage drop of dead resistance and compensate.So the charger that the embodiment of the invention provided can accurately be charged to specific voltage with the battery in the cell apparatus, to promote the usefulness of charging.And the charger that the embodiment of the invention provided can be accelerated the speed that battery is charged to specific voltage, to reduce the required consumed time of charging.

Though the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; those skilled in the art can do some changes and retouching under the premise without departing from the spirit and scope of the present invention, so protection scope of the present invention is as the criterion with claim of the present invention.

Claims (6)

1. a charger be applicable to a dead resistance that compensates a cell apparatus, and this cell apparatus also comprises a battery, and this charger comprises:

One pressurizer provides a charging current to this cell apparatus;

One controller is coupled to this pressurizer, and controls this charging current that this pressurizer is exported; And

One compensation adjustment unit is coupled to this pressurizer and this cell apparatus, and this compensation adjustment unit receives one first reference voltage;

When entering one first operator scheme, this first reference voltage is exported to this pressurizer in this compensation adjustment unit;

When entering one second operator scheme, this controller makes this pressurizer produce one first charging current and one second charging current, in response to this first charging current and this second charging current, one output voltage of this cell apparatus is respectively one first output voltage and one second output voltage, the resistance value of this dead resistance of this cell apparatus is estimated in this compensation adjustment unit by detecting this first output voltage and this second output voltage, in order to this first reference voltage is compensated.

2. charger as claimed in claim 1, wherein this compensation adjustment unit comprises:

One voltage compensation unit is coupled to this pressurizer, and an output signal of this voltage compensation unit is relevant to the difference between this first output voltage and this second output voltage; And

One voltage position contrast is put in order the unit, and this output signal that receives this voltage compensation unit is to compensate this first reference voltage.

3. charger as claimed in claim 2, wherein the whole unit of this voltage position contrast comprises:

One voltage current adapter is coupled to this voltage compensation unit, is converted to one first electric current in order to this output signal with this voltage compensation unit;

One reverse transfer chain is coupled to this voltage current adapter, in order to being a digital code with this first current conversion;

One digital current source is coupled to this reverse transfer chain, in order to determine one second electric current according to this digital code; And

One voltage accumulation unit is coupled to this digital current source, and a bucking voltage is exported according to this second electric current in this voltage accumulation unit, and this bucking voltage is used to compensate this first reference voltage.

4. charger as claimed in claim 3, wherein this voltage accumulation unit comprises:

One operational amplifier has: a first input end is coupled to this first reference voltage; One second input; And an output, be coupled to this second input; And

One resistance, a termination are received this second electric current and the other end is coupled to this output of this operational amplifier, and this bucking voltage is relevant to this ohmically voltage drop.

5. a charger is applicable to a dead resistance that compensates a cell apparatus, and this battery dress system also comprises a battery, and this charger comprises:

One pressurizer provides a charging current to this cell apparatus, in response to this charging current, produces an output voltage in this cell apparatus;

One controller is coupled to this pressurizer, and controls this charging current that this pressurizer is exported;

One voltage compensation unit is coupled to this pressurizer, and an output signal of this voltage compensation unit is relevant to a difference of this output voltage of instantaneous variation;

One voltage current adapter is coupled to this voltage compensation unit, is converted to one first electric current in order to this output signal with this voltage compensation unit;

One reverse transfer chain is coupled to this voltage current adapter, in order to being a digital code with this first current conversion;

One digital current source is coupled to this reverse transfer chain, in order to determine one second electric current according to this digital code; And

One voltage accumulation unit is coupled to this digital current source, and in order to receive one first reference voltage, a bucking voltage is exported according to this second electric current in this voltage accumulation unit, and this bucking voltage is used to compensate this first reference voltage;

When entering one first operator scheme, this first reference voltage is exported to this pressurizer in this voltage accumulation unit;

When entering one second operator scheme, this controller makes this pressurizer produce one first charging current and one second charging current, in response to this first charging current and this second charging current, this output voltage in this cell apparatus is respectively one first output voltage and one second output voltage, the resistance value of this dead resistance of this cell apparatus is estimated in this voltage compensation unit by detecting this first output voltage and this second output voltage, in order to this first reference voltage is compensated.

6. charger as claimed in claim 5, wherein this voltage accumulation unit comprises:

One operational amplifier has: a first input end is coupled to this first reference voltage; One second input; And an output, be coupled to this second input; And

One resistance, a termination are received this second electric current and the other end is coupled to this output of this operational amplifier, and this bucking voltage is relevant to this ohmically voltage drop.

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