CN103208921A - Tracking boosting device and method for power factor correction circuit - Google Patents

Abstract

The invention provides a tracking voltage boosting device and a method for a power factor correction circuit, which adjust feedback voltage related to output voltage of the power factor correction circuit or offset of an error amplifier in the tracking voltage boosting device according to the input voltage of the power factor correction circuit so as to make the output voltage linearly proportional to the root mean square value of the input voltage, thereby leading the power factor correction circuit to have better efficiency.

Description

The tracking increasing apparatus and the method that are used for power factor correction circuit

Technical field

The present invention is relevant a kind of power factor correction (Power Factor Correction; PFC) circuit is particularly about a kind of tracking for power factor correction circuit (tracking boost) device and method that boosts.

Background technology

For the power-supply system of many high-end electronic products (for example notebook computer), efficient is very important problem.For example with reference to power-supply system shown in Figure 1, for high efficiency, the main power voltage Vin that alternating voltage VAC produces throughrectifier 14 rectifications is not direct input voltage as fly-back voltage converter 12, but as the input voltage of power factor correction (PFC)circuit 10,pfc circuit 10 produces voltage Vout1 and offers fly-back voltage converter 12 again as its inputvoltage.In pfc circuit 10,inductance L 1 is connected betweenrectifier 14 and the switch M1,pfc controller 16 diverter switch M1 discharge and recharge withcontrol inductance L 1, inductive current IL produces voltage Vout1 throughcapacitor C 1 charging of diode D1, andresistance R 1 and R2 form voltage divider and givepfc controller 16 with burning voltage Vout1 voltage Vout1 dividing potential drop generation feedback voltageVfb.Pfc circuit 10 uses booster circuit, so its output voltage V out1 is greater than alternating voltage VAC.Voltage Vout1 is set in higher accurate position usually so thatpfc circuit 10 can be suitable for the alternating voltage VAC of wider range, and for example setting voltage Vout1 is that 400V makes the alternating voltage VAC of its application can be from 110V to 240V.Yet the descending slope of inductive current IL is about

Therefore be that when using less alternating voltage VAC, the decrease speed of inductive current IL is very fast, causes the switching frequency of switch M1 higher under the condition of fixing at output voltage V out1, the switch cost ofpfc circuit 10 is bigger, and efficient is relatively poor.

In fact, fly-back voltage converter just can be suitable for the input voltage of wide scope originally, therefore thepfc circuit 10 among Fig. 1 can change the size of adjusting voltage Vout1 according to the size of alternating voltage VAC into, with switching frequency and the cross-pressure of reduction switch M1, and then reduces switch cost.This technology is called to follow the trail of boosts.In addition, use and follow the trail of the person of boosting, because can turn down voltage Vout1, so can reduce the cross-pressure ofinductance L 1, therefore can useless inductance L 1.

Traditional tracking pressure build-up technique is to set state switching points, and for example U.S. Patent number 6,686,725 and 7,501,800, as alternating voltage VAC during less than state switching points,pfc circuit 10 provides less voltage Vout1, and as alternating voltage VAC during greater than state switching points,pfc circuit 10 provides bigger voltage Vout1.Yet this method is nonlinear Control, and near the efficient state switching points is not improved.

U.S. Patent number 7,239,120 extract electric current with main power voltage Vin tool linear correlation as the control parameter from reset end Vfb, thereby make voltage Vout1 and main power voltage Vin tool linear correlation.Yet this method causes the bigger variation of voltage Vout1, socapacitor C 1 must bear higher voltage, and in addition, the electric current of this extraction can vary with temperature, so voltage Vout1 can be subjected to Temperature Influence.U.S. Patent number 7,675,280 provide with the electric current of main power voltage Vin tool inverse relation and inject reset end Vfb, so that voltage Vout1 and main power voltage Vin tool linear correlation.Though this method reduces the variation of voltage Vout1, this electric current that is applied to reset end Vfb is temperature influence still, so also temperature influence of voltage Vout1.

Summary of the invention

One of purpose of the present invention is to propose a kind of tracking increasing apparatus and method for power factor correction circuit.

One of purpose of the present invention is to propose a kind of output voltage of power factor correction circuit and tracking increasing apparatus and method of its input voltage tool linear correlation of making.

One of purpose of the present invention is to propose a kind of tracking increasing apparatus and method that has nothing to do with variations in temperature.

Technical scheme is:

A kind of tracking increasing apparatus for power factor correction circuit is provided, and wherein, described power factor correction circuit contains inductance and the switch of series connection, and switches described switch and input voltage boosted and be output voltage, and described tracking increasing apparatus comprises:

The voltage extractor produces the control signal that changes with described input voltage according to the sensing signal relevant with described input voltage;

Error amplifier produces error signal to regulate described output voltage according to the feedback voltage relevant with described output voltage and the difference between the reference voltage; And

Variable voltage source connects described voltage extractor and error amplifier, provides the variable voltage that changes with described input voltage to be offset described feedback voltage in response to described control signal, makes the root-mean-square value tool linear correlation of described output voltage and described input voltage.

A kind of tracking increasing apparatus for power factor correction circuit is provided, and wherein, described power factor correction circuit contains inductance and the switch of series connection, and switches described switch and input voltage boosted and be output voltage, and described tracking increasing apparatus comprises:

Error amplifier produces error signal to regulate described output voltage according to the feedback voltage relevant with described output voltage and the difference between the reference voltage; And

The voltage extractor, connect described error amplifier, produce the skew that the control signal that changes with described input voltage is adjusted described error amplifier according to the sensing signal relevant with described input voltage, so that the root-mean-square value tool linear correlation of described output voltage and described input voltage.

A kind of tracking step-up method for power factor correction circuit is provided, wherein, described power factor correction circuit contains inductance and the switch of series connection, and switches described switch and input voltage boosted and be output voltage, and described tracking step-up method comprises the following steps:

(A) the described input voltage of sensing produces sensing signal;

(B) obtain the feedback voltage relevant with described output voltage;

(C) produce the control signal that changes with described input voltage according to described sensing signal;

(D) determine to be offset described feedback voltage with the variable voltage that described input voltage changes according to described control signal; And

(E) feedback voltage and the reference voltage according to described skew produces error signal for regulating described output voltage, so that the root-mean-square value tool linear correlation of described output voltage and described input voltage.

A kind of tracking step-up method for power factor correction circuit is provided, wherein, described power factor correction circuit contains inductance and the switch of series connection, and switches described switch and input voltage boosted and be output voltage, and described tracking step-up method comprises the following steps:

(A) the described input voltage of sensing produces sensing signal;

(B) obtain the feedback voltage relevant with described output voltage;

(C) produce the control signal that changes with described input voltage according to described sensing signal;

(D) difference of utilizing error amplifier to amplify between described feedback voltage and the reference voltage produces error signal for regulating described output voltage; And

(E) adjust the skew of described error amplifier according to described control signal, so that the root-mean-square value tool linear correlation of described output voltage and described input voltage.

According to the present invention, a kind of tracking increasing apparatus and method for power factor correction circuit provides the feedback voltage that gives its error amplifier or the skew (offset) of this error amplifier according to the input voltage adjustment of this power factor correction circuit, changing effective skew of this error amplifier, and then make the output voltage linearity of this power factor correction circuit be proportional to the root-mean-square value of this input voltage.Because this output voltage linearity is proportional to the root-mean-square value of this input voltage, so low input can produce low output voltage, thereby effectively improves the efficient of this power factor correction circuit.Should follow the trail of not temperature influence of increasing apparatus and method in addition, so this output voltage can not produce deviation because of variations in temperature.

Description of drawings

Fig. 1 is traditional power-supply system;

Fig. 2 is first embodiment that follows the trail of increasing apparatus;

Fig. 3 is first embodiment of the variable voltage source among Fig. 2;

Fig. 4 is second embodiment of the variable voltage source among Fig. 2;

Fig. 5 is second embodiment that follows the trail of increasing apparatus;

Fig. 6 is the 3rd embodiment that follows the trail of increasing apparatus;

Fig. 7 is the 4th embodiment that follows the trail of increasing apparatus;

Fig. 8 is the 5th embodiment that follows the trail of increasing apparatus;

Fig. 9 is first embodiment of the error amplifier among Fig. 8; And

Figure 10 is second embodiment of the error amplifier among Fig. 8.

Drawing reference numeral:

10 power factor correction circuits

12 fly-back voltage converters

14 rectifiers

The 16PFC controller

20 follow the trail of increasing apparatus

22 reset ends

24 voltage extractors

26 variable voltage sources

28 error amplifiers

The inverting input of 30error amplifiers 28

32 triggers

34 comparators

36 sawtooth generators

40 variable current sources

42 variable current sources

44 variable current sources

Embodiment

With reference to Fig. 2, power factor correction circuit comprises that tracking increasingapparatus 20 according to the present invention provides the error signal Vea relevant with its input voltage vin,sawtooth generator 36 produces sawtooth signal Vramp according to the driving signal Vpfc of switch M1,comparator 34 comparison error signal Vea and sawtooth signal Vramp produce shutdown signal Voff, the electric current I L of ancillary coil L2 inductive sensor L1 produces sensing signal Vzcd,trigger 32 produces according to sensing signal Vzcd and shutdown signal Voff and drives signal Vpfc diverter switch M1 and input voltage vin is converted to output voltage V out1, andresistance R 1 and R2 form voltage divider output voltage V out1 dividing potential drop is given and followed the trail of increasingapparatus 20 to produce feedback voltage Vfb at reset end 22.Because error signal Vea is relevant with input voltage vin, so output voltage V out1 will change with input voltage vin.In following the trail of increasingapparatus 20, resistance R 3 and R4 form voltage divider the input voltage vin dividing potential drop are produced relative sensing signal Vsense,voltage extractor 24 produces the control signal Vtb that changes with input voltage vin according to sensing signal Vsense,variable voltage source 26 is connected between the invertinginput 30 ofreset end 22 anderror amplifier 28, variable voltage Δ V skew feedback voltage Vfb is provided and produces the feedback voltage Vfbo of skew,error amplifier 28 produces error signal Vea to regulate output voltage V out1 according to feedback voltage Vfbo and the difference between the reference voltage Vref of skew.Control signal Vtb makes variable voltage Δ V change with input voltage vin, and then makes the root-mean-square value tool linear correlation of output voltage V out1 and input voltage vin.The implementation ofvoltage extractor 24 has a variety of, in certain embodiments, so long as the circuit that can make control signal Vtb and sensing signal Vsense tool linear correlation all can, for example multiplier or divider.

Fig. 3 is first embodiment of thevariable voltage source 26 among Fig. 2, comprises that resistance R os is connected between variablecurrent source 40 and 42.In this embodiment, control signal

Wherein m is constant.Resistance R os is connected between the invertinginput 30 ofreset end 22 anderror amplifier 28, and variablecurrent source 40 connects the invertinginput 30 oferror amplifier 28, and the electric current that is inversely proportional to input voltage vin is provided according to control signal Vtb

Give resistance R os, variablecurrent source 42 connects resetend 22, extracts electric current according to control signal Vtb from resistance R osResistance R os is according to the electric current on it

Produce variable voltage Δ V, so feedback voltage Vfb is shifted into Vfbo.Electric current

Negative temperature coefficient and the positive temperature coefficient of resistance R os cancel each other out, make the variable voltage Δ V variations in temperature that has nothing to do.The feedback voltage that can obtain being offset from the circuit of Fig. 2 and Fig. 3:

$\mathrm{Vfbo}=\mathrm{Vfb}+\mathrm{\ΔV}$

$=\mathrm{<figure-callout\; label="Vout"\; filenames="HDA0000133879530000031.png"\; state="\{\{state\}\}">Vout</figure-callout>}1\&times;\frac{R1}{\mathrm{<figure-callout\; label="R"\; filenames="HDA0000133879530000031.png"\; state="\{\{state\}\}">R</figure-callout>}1+R3}+I1\left(\frac{1}{\mathrm{Vin}}\right)\&times;\mathrm{Ros}=\mathrm{<figure-callout\; label="Vref\; Formula"\; filenames="HDA0000133879530000031.png"\; state="\{\{state\}\}">Vref</figure-callout>}$Formula 1

Can push away from formula 1:

$\mathrm{<figure-callout\; label="Vout"\; filenames="HDA0000133879530000031.png"\; state="\{\{state\}\}">Vout</figure-callout>}1=[\mathrm{Vref}-I1\left(\frac{1}{\mathrm{Vin}}\right)\&times;\mathrm{Ros}]\&times;(1+\frac{R2}{R1})$Formula 2

Because reference voltage Vref andresistance R 1, R2 and Ros are all definite value, so the root-mean-square value tool linear proportional relation of output voltage V out1 and input voltage vin.

Fig. 4 is second embodiment of thevariable voltage source 26 among Fig. 2, comprise that equally resistance R os is connected between variablecurrent source 40 and 42, but variablecurrent source 40 connectsreset end 22, provide the electric current I 1 (Vin) that is proportional to input voltage vin to give resistance R os, variablecurrent source 42 connects the invertinginput 30 oferror amplifier 28, extracts electric current I 1 (Vin) from resistance R os.In this embodiment, control signal Vtb=K * Vin, wherein K is constant.The feedback voltage that is offset as can be known from the circuit of Fig. 2 and Fig. 4:

$\mathrm{Vfbo}=\mathrm{<figure-callout\; label="Vout"\; filenames="HDA0000133879530000031.png"\; state="\{\{state\}\}">Vout</figure-callout>}1\&times;\frac{R1}{\mathrm{<figure-callout\; label="R"\; filenames="HDA0000133879530000031.png"\; state="\{\{state\}\}">R</figure-callout>}1+R2}-I1\left(\mathrm{Vin}\right)\&times;\mathrm{Ros}=\mathrm{Vref}$Formula 3

Can push away from formula 3:

$\mathrm{<figure-callout\; label="Vout"\; filenames="HDA0000133879530000031.png"\; state="\{\{state\}\}">Vout</figure-callout>}1=[\mathrm{Vref}+I1\left(\mathrm{Vin}\right)\&times;\mathrm{Ros}]\&times;(1+\frac{R2}{R1})$Formula 4

By formula 4 as can be known, the root-mean-square value tool linear proportional relation of output voltage V out1 and input voltage vin.The negative temperature coefficient of electric current I 1 (Vin) and the positive temperature coefficient of resistance R os cancel each other out, and make the variable voltage Δ V variations in temperature that has nothing to do.

In the circuit of Fig. 2, following the trail of increasing apparatus 20 is that mat resistance R 3 and R4 dividing potential drop input voltage vin obtain the sensing signal Vsense relevant with input voltage vin, in other embodiments, also can use other modes to obtain the sensing signal relevant with input voltage vin.For example in the embodiment of Fig. 5, the electric current I L of ancillary coil L2 inductive sensor L1 produces the sensing signal Vzcd relevant with input voltage vin, and voltage extractor 24 produces the control signal Vtb that changes with input voltage vin according to sensing signal Vzcd.In the embodiment of Fig. 6, resistance R cs connects with switch M1, and according to the electric current generation sensing signal Vsense of switch M1, voltage extractor 24 produces control signal Vtb according to sensing signal Vsense.Because the electric current of switch M1 is relevant with input voltage vin, so sensing signal Vsense is relevant with input voltage vin, control signal Vtb changes with input voltage vin.In the embodiment of Fig. 7, voltage extractor 24 is to obtain sensing signal to produce control signal Vtb from feedback voltage Vfb during the start-up operation of pfc circuit.Those skilled in the art has known that pfc circuit is during start-up operation, and pfc controller 16 is diverter switch M1 not, so output voltage V out1 is no better than input voltage vin.Based on this, can utilize voltage extractor 24 during start-up operation, to obtain the sensing signal relevant with input voltage vin from feedback voltage Vfb, produce the control signal Vtb that changes with input voltage vin.After finishing start-up operation, pfc controller 16 beginning diverter switch M1, voltage extractor 24 is no longer detected feedback voltage Vfb, and stores and keep the control signal Vtb that has produced.

Fig. 8 is the 5th embodiment that follows the trail of increasingapparatus 20,voltage extractor 24 provides control signal Vtb to erroramplifier 28, to adjust its skew, this skew changes with input voltage vin, so the root-mean-square value tool linear correlation of output voltage V out1 and input voltage vin.Also can use thetracking increasing apparatus 20 of Fig. 8 Fig. 5, Fig. 6 or mode shown in Figure 7 obtain the sensing signal relevant with input voltage vin and givevoltage extractor 24.

Fig. 9 is first embodiment of theerror amplifier 28 among Fig. 8, comprises forming differential input right transistor M3 and M4, variablecurrent source 44 and being connected the input of transistor M3 and the resistance R os between the variable current source 44.In this embodiment, control signal Vtb=K * Vin, variablecurrent source 44 provides the electric current I 1 that is directly proportional with input voltage vin (Vin) according to control signal Vtb, the control end of transistor M3 and M4 receives feedback voltage Vfb and reference voltage Vref respectively, and shunt current I1 (Vin) is electric current I 2 (Vin) and I3 (Vin) according to this.When electric current I 1 (Vin) increased, the electric current I 2 (Vin) of transistor M3 and M4 and I3 (Vin) also and then increased, and the variable voltage Δ V that resistance R os produces changes with electric current I 2 (Vin), to adjust the skew of error amplifier 28.According to the circuit of Fig. 8 and Fig. 9 as can be known:

Vfb-Δ V=Vref formula 5

And then push away output voltage:

$\mathrm{<figure-callout\; label="Vout"\; filenames="HDA0000133879530000031.png"\; state="\{\{state\}\}">Vout</figure-callout>}1=[\mathrm{Vref}+I2\left(\mathrm{Vin}\right)\&times;\mathrm{Ros}]\&times;(1+\frac{R2}{R1})$Formula 6

Because electric current I 2 (Vin) is proportional to input voltage vin, therefore from formula 6 as can be known, output voltage V out1 linearity is proportional to the root-mean-square value of input voltage vin.The negative temperature coefficient of electric current I 1 (Vin) and the positive temperature coefficient of resistance R os cancel each other out, and make the variable voltage Δ V variations in temperature that has nothing to do.

Figure 10 is second embodiment of theerror amplifier 28 among Fig. 8, and resistance R os changes between the input and variablecurrent source 44 that is connected transistor M4, and control signal

Variablecurrent source 44 provides the electric current that is inversely proportional to input voltage vin according to control signal Vtb

Transistor M3 and M4 are according to feedback voltage Vfb and reference voltage Vref shunt current

Be electric current

And

When input voltage vin is big, electric current

Less, so electric current

Less, V is less for the variable voltage Δ, and the skew oferror amplifier 28 is less.From the circuit of Fig. 8 and Figure 10 as can be known:

Vfb=Vref-Δ V formula 7

Therefore can push away

$\mathrm{<figure-callout\; label="Vout"\; filenames="HDA0000133879530000031.png"\; state="\{\{state\}\}">Vout</figure-callout>}1=[\mathrm{Vref}-I3\left(\frac{1}{\mathrm{Vin}}\right)\&times;\mathrm{Ros}]\&times;(1+\frac{R2}{R1})$Formula 8

Because electric current

Be inversely proportional to input voltage vin, therefore from formula 8 as can be known, output voltage V out1 linearity is proportional to the root-mean-square value of input voltage vin.Electric current

Negative temperature coefficient and the positive temperature coefficient of resistance R os cancel each other out, make the variable voltage Δ V variations in temperature that has nothing to do.

More than be stated as the purpose of illustrating for what preferred embodiment of the present invention was done, accurately be disclosed form and be not intended to limit the present invention, based on above instruction or to make an amendment or change from embodiments of the invention study be possible, embodiment is for explaining orally principle of the present invention and allowing those skilled in the art utilize the present invention to select in practical application with various embodiment and narrate, and technological thought attempt of the present invention is decided by claim and equalization thereof.

Claims (24)

Translated fromChinese

1.一种用于功率因数修正电路的追踪升压装置，其特征在于，所述功率因数修正电路含有串联的电感及开关，并切换所述开关而将输入电压升压为输出电压，所述追踪升压装置包括：1. A tracking booster for a power factor correction circuit, characterized in that the power factor correction circuit contains an inductor and a switch connected in series, and switches the switch to boost the input voltage to an output voltage, the Track Boost devices include:电压萃取器，根据与所述输入电压相关的感测信号产生随所述输入电压变化的控制信号；a voltage extractor, generating a control signal varying with the input voltage according to a sensing signal related to the input voltage;误差放大器，根据与所述输出电压相关的回授电压和参考电压之间的差值产生误差信号以调节所述输出电压；以及an error amplifier generating an error signal based on a difference between a feedback voltage associated with the output voltage and a reference voltage to regulate the output voltage; and可变电压源，连接所述电压萃取器及误差放大器，因应所述控制信号提供随所述输入电压变化的可变电压偏移所述回授电压，使所述输出电压与所述输入电压的均方根值具线性相关。The variable voltage source is connected to the voltage extractor and the error amplifier, and provides a variable voltage that varies with the input voltage to offset the feedback voltage in response to the control signal, so that the output voltage is different from the input voltage The RMS values are linearly related.2.如权利要求1所述的追踪升压装置，其特征在于，所述可变电压源包括：2. The tracking boosting device according to claim 1, wherein the variable voltage source comprises:电阻，具有第一端连接所述误差放大器的非反相输入端及第二端接收所述回授电压；A resistor having a first end connected to the non-inverting input end of the error amplifier and a second end receiving the feedback voltage;第一可变电流源，连接所述电阻的第一端，根据所述控制信号提供电流到所述电阻的第一端；以及a first variable current source connected to the first end of the resistor and providing current to the first end of the resistor according to the control signal; and第二可变电流源，连接所述电阻的第二端，根据所述控制信号从所述电阻的第二端抽取所述电流；a second variable current source connected to the second end of the resistor, and drawing the current from the second end of the resistor according to the control signal;其中，所述电流流过所述电阻产生所述可变电压。Wherein, the current flows through the resistor to generate the variable voltage.3.如权利要求1所述的追踪升压装置，其特征在于，所述可变电压源包括：3. The tracking boosting device according to claim 1, wherein the variable voltage source comprises:电阻，具有第一端连接所述误差放大器的非反相输入端及第二端接收所述回授电压；A resistor having a first end connected to the non-inverting input end of the error amplifier and a second end receiving the feedback voltage;第一可变电流源，连接所述电阻的第二端，根据所述控制信号提供电流到所述电阻的第二端；以及a first variable current source connected to the second end of the resistor and providing current to the second end of the resistor according to the control signal; and第二可变电流源，连接所述电阻的第一端，根据所述控制信号从所述电阻的第一端抽取所述电流；a second variable current source connected to the first end of the resistor, and draws the current from the first end of the resistor according to the control signal;其中，所述电流流过所述电阻产生所述可变电压。Wherein, the current flows through the resistor to generate the variable voltage.4.如权利要求1所述的追踪升压装置，其特征在于，更包括串联的二电阻分压所述输入电压产生所述感测信号。4 . The tracking boost device as claimed in claim 1 , further comprising two resistors connected in series to divide the input voltage to generate the sensing signal.5.如权利要求1所述的追踪升压装置，其特征在于，更包括辅助线圈感应所述电感的电流产生所述感测信号。5 . The tracking boost device as claimed in claim 1 , further comprising an auxiliary coil to induce the current of the inductor to generate the sensing signal. 6 .6.如权利要求1所述的追踪升压装置，其特征在于，更包括电阻与所述开关串联，根据所述开关的电流产生所述感测信号。6 . The tracking boost device as claimed in claim 1 , further comprising a resistor connected in series with the switch, and generating the sensing signal according to the current of the switch. 7 .7.如权利要求1所述的追踪升压装置，其特征在于，所述电压萃取器在所述功率因数修正电路的启动操作期间从所述回授电压取得所述感测信号。7. The tracking boost device as claimed in claim 1, wherein the voltage extractor obtains the sensing signal from the feedback voltage during the startup operation of the power factor correction circuit.8.一种用于功率因数修正电路的追踪升压装置，其特征在于，所述功率因数修正电路含有串联的电感及开关，并切换所述开关而将输入电压升压为输出电压，所述追踪升压装置包括：8. A tracking booster for a power factor correction circuit, characterized in that the power factor correction circuit includes an inductor and a switch connected in series, and the switch is switched to boost the input voltage to an output voltage, the Track Boost devices include:误差放大器，根据与所述输出电压相关的回授电压和参考电压之间的差值产生误差信号以调节所述输出电压；以及an error amplifier generating an error signal based on a difference between a feedback voltage associated with the output voltage and a reference voltage to regulate the output voltage; and电压萃取器，连接所述误差放大器，根据与所述输入电压相关的感测信号产生随所述输入电压变化的控制信号调整所述误差放大器的偏移，以使所述输出电压与所述输入电压的均方根值具线性相关。A voltage extractor, connected to the error amplifier, generates a control signal that varies with the input voltage according to a sensing signal related to the input voltage to adjust the offset of the error amplifier, so that the output voltage is consistent with the input voltage The rms value of the voltage is linearly related.9.如权利要求8所述的追踪升压装置，其特征在于，所述误差放大器包括：9. The tracking boost device according to claim 8, wherein the error amplifier comprises:组成差动对的第一晶体管及第二晶体管，各具有控制端，分别接收所述回授电压及参考电压；The first transistor and the second transistor forming the differential pair each have a control terminal for respectively receiving the feedback voltage and the reference voltage;可变电流源，连接所述第二晶体管的输入端，根据所述控制信号提供电流；以及a variable current source, connected to the input terminal of the second transistor, to provide current according to the control signal; and电阻，连接在所述第一晶体管的输入端及所述可变电流源之间，提供随所述电流变化的可变电压以调整所述误差放大器的偏移。A resistor, connected between the input terminal of the first transistor and the variable current source, provides a variable voltage varying with the current to adjust the offset of the error amplifier.10.如权利要求8所述的追踪升压装置，其特征在于，所述误差放大器包括：10. The tracking boost device according to claim 8, wherein the error amplifier comprises:组成差动对的第一晶体管及第二晶体管，各具有控制端，分别接收所述回授电压及参考电压；The first transistor and the second transistor forming the differential pair each have a control terminal for respectively receiving the feedback voltage and the reference voltage;可变电流源，连接所述第一晶体管的输入端，根据所述控制信号提供电流；以及a variable current source connected to the input terminal of the first transistor and providing current according to the control signal; and电阻，连接在所述第二晶体管的输入端及所述可变电流源之间，提供随所述电流变化的可变电压以调整所述误差放大器的偏移。A resistor, connected between the input terminal of the second transistor and the variable current source, provides a variable voltage that varies with the current to adjust the offset of the error amplifier.11.如权利要求8所述的追踪升压装置，其特征在于，更包括串联的二电阻分压所述输入电压产生所述感测信号。11 . The tracking boost device as claimed in claim 8 , further comprising two resistors connected in series to divide the input voltage to generate the sensing signal.12.如权利要求8所述的追踪升压装置，其特征在于，更包括辅助线圈感应所述电感的电流产生所述感测信号。12 . The tracking boost device as claimed in claim 8 , further comprising an auxiliary coil to induce the current of the inductor to generate the sensing signal. 13 .13.如权利要求8所述的追踪升压装置，其特征在于，更包括电阻与所述开关串联，根据所述开关的电流产生所述感测信号。13 . The tracking boost device as claimed in claim 8 , further comprising a resistor connected in series with the switch, and generating the sensing signal according to the current of the switch. 14 .14.如权利要求8所述的追踪升压装置，其特征在于，所述电压萃取器在所述功率因数修正电路的启动操作期间从所述回授电压取得所述感测信号。14. The tracking boost device as claimed in claim 8, wherein the voltage extractor obtains the sensing signal from the feedback voltage during the start-up operation of the power factor correction circuit.15.一种用于功率因数修正电路的追踪升压方法，其特征在于，所述功率因数修正电路含有串联的电感及开关，并切换所述开关而将输入电压升压为输出电压，所述追踪升压方法包括下列步骤：15. A tracking boosting method for a power factor correction circuit, characterized in that the power factor correction circuit contains an inductor and a switch connected in series, and the switch is switched to boost the input voltage to an output voltage, the The Track Boost method includes the following steps:(A)感测所述输入电压产生感测信号；(A) sensing the input voltage to generate a sensing signal;(B)取得与所述输出电压相关的回授电压；(B) obtaining a feedback voltage related to the output voltage;(C)根据所述感测信号产生随所述输入电压变化的控制信号；(C) generating a control signal that varies with the input voltage according to the sensing signal;(D)根据所述控制信号决定随所述输入电压变化的可变电压偏移所述回授电压；以及(D) determining a variable voltage that varies with the input voltage to offset the feedback voltage according to the control signal; and(E)根据所述偏移的回授电压及参考电压产生误差信号供调节所述输出电压，以使所述输出电压与所述输入电压的均方根值具线性相关。(E) generating an error signal for adjusting the output voltage according to the offset feedback voltage and the reference voltage, so that the output voltage has a linear correlation with the RMS value of the input voltage.16.如权利要求15所述的追踪升压方法，其特征在于，所述步骤A包括分压所述输入电压产生所述感测信号。16. The tracking boost method according to claim 15, wherein the step A comprises dividing the input voltage to generate the sensing signal.17.如权利要求15所述的追踪升压方法，其特征在于，所述步骤A包括感测所述电感的电流产生所述感测信号。17 . The tracking boost method according to claim 15 , wherein the step A comprises sensing the current of the inductor to generate the sensing signal. 18 .18.如权利要求15所述的追踪升压方法，其特征在于，所述步骤A包括感测所述开关的电流产生所述感测信号。18. The tracking boost method according to claim 15, wherein the step A comprises sensing the current of the switch to generate the sensing signal.19.如权利要求15所述的追踪升压方法，其特征在于，所述步骤A包括在所述功率因数修正电路的启动操作期间从所述回授电压取得所述感测信号。19. The tracking boost method as claimed in claim 15, wherein the step A comprises obtaining the sensing signal from the feedback voltage during the start-up operation of the power factor correction circuit.20.一种用于功率因数修正电路的追踪升压方法，其特征在于，所述功率因数修正电路含有串联的电感及开关，并切换所述开关而将输入电压升压为输出电压，所述追踪升压方法包括下列步骤：20. A tracking boost method for a power factor correction circuit, characterized in that the power factor correction circuit includes an inductor and a switch connected in series, and the switch is switched to boost the input voltage to an output voltage, the The Track Boost method includes the following steps:(A)感测所述输入电压产生感测信号；(A) sensing the input voltage to generate a sensing signal;(B)取得与所述输出电压相关的回授电压；(B) obtaining a feedback voltage related to the output voltage;(C)根据所述感测信号产生随所述输入电压变化的控制信号；(C) generating a control signal that varies with the input voltage according to the sensing signal;(D)利用误差放大器放大所述回授电压及参考电压之间的差值产生误差信号供调节所述输出电压；以及(D) using an error amplifier to amplify the difference between the feedback voltage and the reference voltage to generate an error signal for adjusting the output voltage; and(E)根据所述控制信号调整所述误差放大器的偏移，以使所述输出电压与所述输入电压的均方根值具线性相关。(E) Adjusting the offset of the error amplifier according to the control signal, so that the output voltage has a linear correlation with the RMS value of the input voltage.21.如权利要求20所述的追踪升压方法，其特征在于，所述步骤A包括分压所述输入电压产生所述感测信号。21. The tracking boost method according to claim 20, wherein the step A comprises dividing the input voltage to generate the sensing signal.22.如权利要求20所述的追踪升压方法，其特征在于，所述步骤A包括感测所述电感的电流产生所述感测信号。22. The tracking boost method according to claim 20, wherein the step A comprises sensing the current of the inductor to generate the sensing signal.23.如权利要求20所述的追踪升压方法，其特征在于，所述步骤A包括感测所述开关的电流产生所述感测信号。23. The tracking boost method according to claim 20, wherein the step A comprises sensing the current of the switch to generate the sensing signal.24.如权利要求20所述的追踪升压方法，其特征在于，所述步骤A包括在所述功率因数修正电路的启动操作期间从所述回授电压取得所述感测信号。24. The tracking boost method as claimed in claim 20, wherein the step A comprises obtaining the sensing signal from the feedback voltage during the start-up operation of the power factor correction circuit.

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