CN104660028B - A kind of circuit of power factor correction - Google Patents
A kind of circuit of power factor correction Download PDFInfo
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- CN104660028B CN104660028B CN201510031164.5A CN201510031164A CN104660028B CN 104660028 B CN104660028 B CN 104660028B CN 201510031164 A CN201510031164 A CN 201510031164A CN 104660028 B CN104660028 B CN 104660028B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4225—Arrangements for improving power factor of AC input using a non-isolated boost converter
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
Abstract
The invention discloses a kind of circuit of power factor correction, it includes：Input current sample circuit, the input current of power stage circuit is flowed into sample, and forms input current sampled signal；Duty cycle signals generation circuit, receives feedback compensation signal and the clock signal in fixed clock cycle, identical with the clock signal frequency to produce, and characterizes the duty cycle signals of feedback compensation signal size；Reference voltage generating circuit, receives the duty cycle signals and busbar voltage sampled signal, to produce the reference voltage signal consistent with the busbar voltage waveform；Modulated signal producing circuit, receives the input current sampled signal and reference voltage signal, to produce a modulated signal；Logic and driver circuitry, receives the modulated signal, to produce corresponding control signal, to control the conducting state of switching tube in the power stage circuit, it is ensured that input current waveform is consistent with busbar voltage waveform, and output voltage or electric current maintain substantially constant.
Description
Technical field
The present invention relates to a kind of Power Electronic Technique, more specifically to a kind of power factor being applied in power supply
Correcting circuit.
Background technology
In various drivers, PF values (power factor) are an important energy-saving indexs, will not influence whether driver
Conversion efficiency, while when power factor is relatively low, pollution can be produced to the power network of whole electric power system, therefore, for PFC (work(
Rate factor correcting circuit) requirement by more and more higher.
In the prior art, traditional method for realizing High Power Factor control has two kinds：One kind be by using
Constant on time (fixed ON time) control mode realization, average value and the ton (ON time) of input current
Square be directly proportional, be inversely proportional with ts (power frequency period), when integrated circuit operation is under BCM (critical continuous mode) pattern, due to ton
It is relatively fixed in whole power frequency period, ts changes less in power frequency period, therefore the higher PF values of input can be realized.But
It is that toff (degaussing time) is changed in whole power frequency period, is caused ts to be changed in whole power frequency period, is not absolute
Constant, therefore, input current can not follow input voltage well.Secondly, input current sample circuit is general in input filter
After ripple electric capacity, input current and input voltage is caused to have phase difference so that total input current can not follow input electricity well
Pressure.
Another method is the voltage by sampled output, and same reference voltage is contrasted, amplified by error
And error compensation obtains offset voltage, and by the way that multiplier internal IC (integrated circuit) is by offset voltage and characterizes input electricity
One multiple voltage of pressure is multiplied, and obtained benchmark realizes high PF as the peak envelope of current sample.But this method is scarce
Be trapped in：1, due to using multiplier, the problem of bringing cost and volume, cost is higher, and volume is larger；2, it is impossible to exclude with it is defeated
Enter influence of the dephased input current of voltage to total current, cause PF and THD (total harmonic distortion) poor.
The content of the invention
In view of this, the invention provides a kind of circuit of power factor correction, to solve existing PFC electricity
Because using high cost large volume problem caused by multiplier in road, and because input filter capacitor is to the interference of total current
Cause the problem of input current can not follow input voltage well.
First aspect there is provided a kind of circuit of power factor correction, including：
Input current sample circuit, the input current of power stage circuit is flowed into sample, and forms input current sampling letter
Number；
Duty cycle signals generation circuit, receives feedback compensation signal and the clock signal in fixed clock cycle, with produce with
The clock signal frequency is identical, and characterizes the duty cycle signals of the feedback compensation signal size；
Reference voltage generating circuit, receives the duty cycle signals and busbar voltage sampled signal, to produce and the mother
The consistent reference voltage signal of line voltage waveform；
Modulated signal producing circuit, receives the input current sampled signal and reference voltage signal, to produce a modulation
Signal；
Logic and driver circuitry, receives the modulated signal, to produce corresponding control signal, to control the power stage
The conducting state of power switch in circuit, it is ensured that input current waveform is consistent with busbar voltage waveform, and output voltage or
Electric current maintains substantially constant.
Preferably, input current sample circuit is connected between the rectification circuit and input filter capacitor.
Preferably, input current sample circuit includes：
First sampling resistor, is connected to the second output end of the rectification circuit and the second end of input filter capacitor and ground
Between the common point of connection；
First output end of the rectification circuit and the first end of input filter capacitor are connected.
Preferably, the feedback compensation signal is voltage compensation signal.
Preferably, the circuit of power factor correction also includes：
Voltage sampling circuit, is made up of assists winding and partial pressure sampling resistor, and output voltage size is characterized to obtain
Voltage feedback signal and the busbar voltage sampled signal；
Voltage compensating circuit, to produce voltage compensation letter according to the voltage feedback signal and the first reference voltage signal
Number.
Preferably, the feedback compensation signal is current compensation signal.
Preferably, the circuit of power factor correction also includes：
Current sampling circuit, it is current defeated to produce sign to the electric current of power switch in sample streams overpower level circuit
Go out the current feedback signal of size of current；
Current compensation circuit, to produce current compensation letter according to the current feedback signal and the second reference voltage signal
Number.
Preferably, the duty cycle signals generation circuit includes：
Rest-set flip-flop, the set end of the rest-set flip-flop receives clock signal, and reset terminal receives reset signal, exports duty
Compare signal；
Ramp signal generating circuit, to produce the second ramp voltage signal；
Comparator, the in-phase input end of the comparator receives second ramp voltage signal, and inverting input is received
The voltage compensation signal or current compensation signal, export the reset signal.
Preferably, the ramp signal generating circuit includes second switch, current source and the 5th electric capacity；
The second switch, current source and the 5th electric capacity are connected in parallel, and the first common point in parallel generates the second ramp voltage
Signal, the second common point ground connection in parallel；
The second switch is turned on when the duty cycle signals are low；
The current source charges when the second switch disconnects to the 5th electric capacity；
5th electric capacity discharges when the second switch is turned on.
Preferably, the reference voltage generating circuit includes the 3rd switch, the 4th switch, the 6th resistance and the 6th electric capacity；
The first end of 3rd switch receives the busbar voltage sampled signal, the first end of the switch of the second termination the 4th
With the common point of the 6th resistance first end, the 3rd switch is turned on when duty cycle signals are high；
The second end ground connection of 4th switch, the 4th switch is turned on when duty cycle signals are low；
The first end of second the 6th electric capacity of termination of the 6th resistance；
Voltage on the second end ground connection of 6th electric capacity, the 6th electric capacity is reference voltage signal.
Second aspect there is provided a kind of Switching Power Supply, including：
Circuit of power factor correction according to any one of claim 1-10.
The technology of the present invention obtains output current feedback signal or output voltage feedback signal by sampling, feedback signal
Compared with reference voltage, amplified by error and compensated and obtain feedback compensation signal, the signal for passing through the fixed clock cycle will
Feedback compensation signal is converted into duty cycle signals, by this duty cycle signals and sampling obtain bus voltage value be multiplied obtain benchmark electricity
Signal is pressed, reference voltage signal and input current sampled signal are compared and obtain modulated signal, produced according to modulated signal
Pwm signal controls the conducting state of power switch in power stage circuit, reaches input current waveform and input voltage waveform one
The purpose of cause.Because input current sample circuit is arranged between rectification circuit and input filter capacitor, therefore, eliminate with it is defeated
Enter influence of the dephased input current of voltage to total current, realize higher power factor；And feedback compensation signal and
The multiplication of busbar voltage sampled signal is realized by the duty cycle signals for intermediate conversion, therefore need not be used traditional
Multiplier, reduces system cost, reduces system volume.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
The embodiment of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing of offer obtains other accompanying drawings.
Fig. 1 is the structured flowchart of the circuit of power factor correction of one embodiment；
Fig. 2 is a kind of circuit structure diagram of circuit of power factor correction；
Fig. 3 is the structure chart of the voltage compensating circuit of one embodiment；
Fig. 4 is the structure chart of the duty cycle signals generation circuit of one embodiment；
Fig. 5 is the working waveform figure of dutycycle generation circuit in one embodiment；
Fig. 6 is the structure chart of reference voltage generating circuit in one embodiment；
Fig. 7 is the structure chart of modulated signal producing circuit in one embodiment；
Fig. 8 is the working waveform figure of modulated signal producing circuit in one embodiment；
Fig. 9 is the structured flowchart of the circuit of power factor correction of another embodiment disclosed by the invention；
Embodiment
Below based on embodiment, present invention is described, but the present invention is not restricted to these embodiments.Under
Text is detailed to describe some specific detail sections in the detailed description of the present invention.Do not have for a person skilled in the art
The description of these detail sections can also understand the present invention completely.In order to avoid obscuring the essence of the present invention, known method, mistake
Journey, flow, element and circuit do not have detailed narration.
In addition, it should be understood by one skilled in the art that provided herein accompanying drawing be provided to explanation purpose, and
What accompanying drawing was not necessarily drawn to scale.
It will also be appreciated that in the following description, " circuit " refers to be passed through by least one element or sub-circuit electric
The galvanic circle that connection or electromagnetism are connected and composed." connected when claiming element or circuit " being connected to " another element or element/circuit
" between two nodes when, it can directly be coupled or be connected to another element or there may be intermediary element, element it
Between connection can be physically, in logic or its combination.On the contrary, " connecting when title element " being directly coupled to " or directly
Be connected to " another element when, it is meant that both be not present intermediary element.
Unless the context clearly requires otherwise, otherwise entire disclosure is similar with the " comprising " in claims, "comprising" etc.
Word should be construed to the implication included rather than exclusive or exhaustive implication；That is, being containing for " including but is not limited to "
Justice.
In the description of the invention, it is to be understood that term " first ", " second " etc. be only used for describe purpose, without
It is understood that to indicate or imply relative importance.In addition, in the description of the invention, unless otherwise indicated, the implication of " multiple "
It is two or more.
Fig. 1 is the structured flowchart of the circuit of power factor correction of one embodiment disclosed by the invention.As shown in figure 1, work(
Rate factor correcting circuit includes rectification circuit 11, power stage circuit 12 and control circuit 13.
Rectification circuit 11 receives AC-input voltage AC, and direct current is exported after carrying out rectification to it.Rectification circuit 11 can be with
For bridge-type rectifier bridge, or semi-bridge type rectifier bridge.The output of rectification circuit 11 can be equivalent to direct voltage source.
Power stage circuit 12 includes the components such as inductance (or transformer), power switch, diode, directly receives rectified current
The direct current of road output or the direct current for receiving rectification circuit output after circuit after filtering, pass through power switch conducting state
Control so that the input current of power stage circuit is consistent with input voltage waveform, and output voltage substantially constant.
Control circuit 13 includes voltage sampling circuit 131, input current sample circuit 132, voltage compensating circuit 133, accounted for
Sky is than signal generating circuit 134, reference voltage generating circuit 135, modulated signal producing circuit 136 and logic and driver circuitry
137.Circuit 13 is controlled according to the feedback signal of voltage and current in power stage circuit, produces pwm signal to control power stage electricity
The conducting state of power switch in road.
Fig. 2 is a kind of circuit structure diagram of circuit of power factor correction, as illustrated, rectification circuit 11 is bridge-type rectification
Circuit, power stage circuit 12 is inverse excitation type converter.It includes power switch Q1, primary side winding NP, vice-side winding NS, rectification two
Pole pipe D1 and electric capacity C3.Wherein, primary side winding NP one end connects the power input of power stage circuit 12.Power switch Q1 connects
It is connected between the primary side winding NP other end and control circuit ground end.Power switch Q1 is controlled semiconductor switches device, example
Such as, metal semiconductor oxide transistor (MOSFET) or bipolar transistor (BJT).Vice-side winding NS and primary side winding NP couplings
Close.Commutation diode D1 is connected between vice-side winding NS one end and the output end of power stage circuit.Vice-side winding NS's is another
One end is connected to secondary side joint ground terminal.Electric capacity C3 is connected between output end and secondary side joint ground terminal.Power stage circuit 12 is also wrapped
Electric capacity C1 is included, it is used to be filtered supply voltage, electric capacity C1 one end is connected to power input, and the other end is connected to
Ground.It should be understood that the power stage circuit of other known topological form, such as booster type are topological, implementation of the present invention can also be had benefited from
The teaching of example.
Circuit of power factor correction also includes power supply circuit, it is preferable that power supply circuit is by resistance R2 and electric capacity C2 series connection groups
Into the voltage that an end of power supply circuit is connected on the input of power stage circuit, other end ground connection, electric capacity C2 is power supply electricity
Pressure, operating voltage is provided for IC.
With reference to Fig. 2, voltage sampling circuit 131 includes assists winding NAUX, partial pressure sampling resistor R3 and partial pressure sampling resistor
R4.One end of assists winding is connected to the common node of resistance R2 and electric capacity C2 in power supply circuit, the other end by diode D2
Ground connection.Resistance R3 one end is connected to the common node of assists winding and diode D2, another terminating resistor R4, and resistance R4's is another
One end is grounded.The voltage that resistance R3 and resistance R4 constitutes on pressure sampling circuit, resistance R4 is detection voltage VZCS, work as power
When switching Q1 shut-offs, the secondary commutation diode D1 afterflows in power stage circuit are turned on, and the voltage on vice-side winding NS is clamped
In output voltage Vout, now, assists winding NAUX and vice-side winding NS are coupled, then the voltage on resistance R4 is detection voltage
VZCSFor：
VFB=VZCS,
Thus, just it can sample when power switch Q1 is turned off and obtain the feedback signal V of output voltageFB.Work as power switch
When Q1 is turned on, assists winding NAUX and primary side winding NP couplings, now, the voltage on resistance R4 are detection voltage VZCSFor：
VBUS1=VZCS,
Thus, just it can sample when power switch Q1 is turned on and obtain inlet highway voltage VBUSSampled signal VBUS1。
Input current sample circuit 132 flows into the input current of power stage circuit to sample, and forms input current sampling
Signal VSEN；Specifically, input current sample circuit 132 is the first sampling resistor R1, and be connected to the rectification circuit second is defeated
Go out between end and the common point that is connected to ground of the second end of input filter capacitor, the first output end and the input of the rectification circuit
The first end connection of filter capacitor.Because input current sample circuit 132 is arranged on rectification circuit 11 and input filter capacitor C1
Between, the electric current for flowing through sampling resistor R1 is the electric current of rectifier bridge output, then the voltage on sampling resistor R1 is input current
Sampled signal VSEN, before input current after filtering electric capacity sample rate current, it is to avoid input filter capacitor is sampled to input current
The influence of signal phase, therefore, eliminates the influence to total current with the dephased input current of input voltage, realize compared with
High power factor.
Fig. 3 is the structure chart of voltage compensating circuit 133, and voltage compensating circuit 133 receives the feedback signal V of output voltageFB
With the reference voltage Vref 1 for characterizing expectation voltage, output voltage compensation signal Vcomp1, in the present embodiment, feedback compensation believe
Number be voltage compensation signal Vcomp1.Voltage compensation signal Vcomp1 characterizes the feedback signal V of output voltageFBWith first with reference to electricity
Press Vref1 difference.In a preferred embodiment, voltage compensating circuit 133 includes trsanscondutance amplifier GM1 and is connected to institute
State the electric capacity C4 between trsanscondutance amplifier and earth terminal.Trsanscondutance amplifier GM1 has the feedback signal V for receiving output voltageFB's
In-phase end and the end of oppisite phase for receiving the first reference voltage Vref 1.Feedback signal Vs of the trsanscondutance amplifier GM1 based on output voltageFBWith
The difference of first reference voltage Vref 1 charges to electric capacity C4 or extracts electric current, so that electric capacity C4 both end voltages Vcomp1 can
For characterizing the feedback signal V of output voltageFBWith the difference for characterizing the first reference voltage Vref 1 for expecting voltage.Certainly, originally
Art personnel are readily appreciated that voltage compensating circuit 133 can also realize that for example difference is put using other circuits or element
Big circuit.
Fig. 4 is the structure chart of duty cycle signals generation circuit 134, the compensation of the receiving voltage of duty cycle signals generation circuit 134
The signal Vcomp1 and clock signal clock in fixed clock cycle, it is identical with clock signal clock frequencies to produce, and characterize
The duty cycle signals V of voltage compensation signal Vcomp1 sizesD.Specifically, duty cycle signals generation circuit 134 includes：RS is triggered
Device 1341, the set end of the rest-set flip-flop 1341 receives clock signal clock, and reset terminal receives reset signal RES, and output is accounted for
Sky is than signal VD；Ramp signal generating circuit 1342, to produce the second ramp voltage signal Vramp2；Comparator COMP, institute
The in-phase input end for stating comparator receives the second ramp voltage signal Vramp2, inverting input receiving voltage thermal compensation signal
Vcomp1, output reset signal RES.
Ramp signal generating circuit 1342 includes second switch k, current source I and the 5th electric capacity C5.Second switch k, electric current
Source I and the 5th electric capacity C5 are connected in parallel, the first second ramp voltage signal of common point generation in parallel Vramp2, and second is in parallel public
Point ground connection.
Fig. 5 is the working waveform figure of dutycycle generation circuit 134, with reference to Fig. 5, the work of duty cycle signals generation circuit 134
It is as process：When clock signal clock is high level, now set signal RES is low level, the output of rest-set flip-flop 1341
Hold the duty cycle signals V of Q outputsDFor high level, meanwhile, the output end Q of rest-set flip-flop 1341 is by a NOT gate NOT to output
As a result logical conversion is carried out, by duty cycle signals VDAs second switch k control signal after anti-phase, then now second switch k
Control signal be low level, second switch K disconnects, then current source gives the 5th electric capacity C5 chargings, the voltage on the 5th electric capacity C5
As the second ramp voltage signal Vramp2.In this stage, the second ramp voltage signal Vramp2 constantly rises, until rising
During to more than voltage compensation signal Vcomp1, the set signal RES of comparator COMP outputs is high level, until next clock
Signal arrives.Now, the duty cycle signals V of the output end Q outputs of rest-set flip-flop 1341DSaltus step is low level, second switch k's
Control signal is high level, then second switch K conductings, the 5th electric capacity C5 ground connection electric discharge.In this way, a cycle work is completed.By
This can be seen that duty cycle signals VDThere is identical frequency with clock signal clock, and it is big to characterize voltage compensation signal Vcomp1
It is small.
The structure chart of voltage generation circuit 135 on the basis of Fig. 6, reference voltage generating circuit 135 receives the dutycycle letter
Number VDWith busbar voltage sampled signal VBUS1, to produce the reference voltage signal V consistent with the busbar voltage waveformC1.It is described
Reference voltage generating circuit 135 includes the 3rd switch Q3, the 4th switch Q4, the 6th resistance R6 and the 6th electric capacity C6.Described 3rd
The first end for switching Q3 receives the busbar voltage sampled signal VBUS1, the switch Q4 of the second termination the 4th first end and the 6th electricity
Hinder the common point of R6 first ends, the second end ground connection of the 4th switch Q4, the electricity of the second termination the 6th of the 6th resistance R6
Hold C6 first end, the second end ground connection of the 6th electric capacity C6.Voltage on 6th electric capacity is reference voltage VC1。
Reference voltage generating circuit 135 is by the duty cycle signals VDWith busbar voltage sampled signal VBUS1Be multiplied, produce and
The busbar voltage VBUSThe consistent reference voltage signal V of waveformC1Principle be：The 3rd switch Q3 and the 4th switch Q4
It is controlled by above-mentioned duty cycle signals VD, the 3rd switch Q3 is in duty cycle signals VDTurned on during for high (i.e. t1 stages in Fig. 5), will
Busbar voltage sampled signal VBUS1It is transferred in the RC filter circuits being made up of the 6th resistance R6 and the 6th electric capacity C6, and by the 6th
Electric capacity C6 is kept；4th switch Q4 is in duty cycle signals VDTurned on during for low (i.e. t1 stages in Fig. 5), the 6th electric capacity C6 ground connection
Electric discharge, thus, the voltage on the 6th electric capacity C6 is reference voltage signal VC1As duty cycle signals VDSample and believe with busbar voltage
Number VBUS1The result of multiplication.So.Voltage compensation signal Vcomp1 is multiplied by for intermediate conversion with bus voltage signal
Duty cycle signals VDTo realize, therefore traditional multiplier need not be used, reduce system cost, reduce system volume.
Fig. 7 is the structure chart of modulated signal producing circuit 136, and modulated signal producing circuit 136 receives above-mentioned input current
Sampled signal VSENWith reference voltage signal VC1, to produce a Regulate signal VC2, the Regulate signal VC2With first slope voltage
Signal Vramp1 is compared, so as to produce modulated signal VC3.Modulated signal producing circuit 136 includes trsanscondutance amplifier
The GM2 and electric capacity C7 and logic circuit being connected between the trsanscondutance amplifier and earth terminal.Trsanscondutance amplifier GM2, which has, to be connect
Receive input current sampled signal VSENIn-phase end and receive reference voltage signal VC1End of oppisite phase.Trsanscondutance amplifier GM2 is based on defeated
Enter current sampling signal VSENWith reference voltage signal VC1Difference to electric capacity C7 charge or extract electric current so that electric capacity C7
Both end voltage VC2It can be used for characterizing input current sampled signal VSENIn-phase end and receive reference voltage signal VC1Difference.Patrol
Collect circuit and receive Regulate signal VC2With first slope voltage signal Vramp1, modulated signal V is producedC3, the first slope voltage
Signal Vramp1 is the ramp signal of fixed frequency.
Fig. 8 is the working waveform figure of modulated signal producing circuit 137, and logic circuit is in the first slope voltage signal
Vramp1 is less than the Regulate signal VC2When, the modulated signal V of outputC3For high level；In the first slope voltage signal
Vramp1 reaches the Regulate signal VC2When, the modulated signal V of outputC3For low level, the logical transition of signal is so completed,
By Regulate signal VC2It is converted into modulated signal VC3。
Preferably, circuit of power factor correction also includes logical sum control circuit 137, and logical sum control circuit 137 is received
The modulated signal VC3, to produce corresponding pwm control signal, to control the conducting shape of switching tube Q1 in the power stage circuit
State, it is ensured that input current waveform is consistent with busbar voltage waveform, and output voltage maintains substantially constant.
In summary, the circuit structure for realizing PFC has been constituted, it realizes high power factor correction
Operation principle is：By the output voltage feedback signal V of power stage circuitFBWith reference voltage Vref by application condition amplification and
After compensation, the negative voltage feedback thermal compensation signal Vcomp1 of a direct current is produced, and is converted into a duty cycle signals VD.Will
Busbar voltage sampled signal VBUS1With being multiplied by the duty cycle signals V for intermediate conversion for voltage compensation signal Vcomp1DCome
Realize, multiplied result is used as reference voltage signal VC1, therefore traditional multiplier need not be used.Due to voltage compensation signal
Vcomp1 is a DC quantity, therefore reference voltage signal VC1Waveform and busbar voltage sampled signal VBUS1Unanimously.Then by benchmark
Voltage signal VC1It is used as input current sampled signal VSENReference signal, therefore the waveform and busbar voltage of input current
VBUSIt is identical, and the size of input current then depends on output voltage compensation signal Vcomp1.In this way, just realizing power factor
Correction.And because input current sample circuit is arranged between rectification circuit and input filter capacitor, therefore, eliminates and input
Influence of the dephased input current of voltage to total current, realizes higher power factor；And voltage compensation signal and mother
The multiplication of line voltage sampled signal is realized by the duty cycle signals for intermediate conversion, therefore need not be multiplied using traditional
Musical instruments used in a Buddhist or Taoist mass, reduces system cost, reduces system volume.
Fig. 9 is the structured flowchart of the circuit of power factor correction of another embodiment disclosed by the invention, as shown in figure 9,
Circuit of power factor correction includes rectification circuit 11, power stage circuit 12 and control circuit 14.
Circuit 14 is controlled to include current sampling circuit 141, voltage sampling circuit 131, input current sample circuit 132, electricity
Flow compensation circuit 142, duty cycle signals generation circuit 134, reference voltage generating circuit 135, modulated signal producing circuit 136 with
And logic and driver circuitry 137.
It is with the difference of upper one embodiment：Duty cycle signals generation circuit 134 receives a current compensation signal
The Vcomp2 and clock signal clock in fixed clock cycle, it is identical with clock signal clock frequencies to produce, and characterize electric current
The duty cycle signals V of thermal compensation signal Vcomp2 sizesD.Circuit 14 is controlled according to the feedback letter of voltage and current in power stage circuit
Number, produce pwm signal to control the conducting state of power switch in power stage circuit so that the output current dimension of power stage circuit
Hold substantially constant.
The current sampling circuit 141, with reference to Fig. 2, including the 5th resistance R5 connected with power switch Q1, by work(
Voltage during rate switch Q1 shut-offs on the 5th resistance R5 of sampling, you can obtain the peak current information of output current, pass through chip
Internal calculating, obtains output current sampled signal IFB。
Current compensation circuit 142 receives the feedback signal I of output currentFBWith the second reference voltage for characterizing expectation electric current
Vref2 (is not marked) in figure, output current thermal compensation signal Vcomp2.
Control other circuit structures of circuit 14 identical with upper one embodiment.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for those skilled in the art
For, the present invention can have various changes and change.It is all any modifications made within spirit and principles of the present invention, equivalent
Replace, improve etc., it should be included in the scope of the protection.
Claims (11)
1. a kind of circuit of power factor correction, applied to an ac/dc power supply, it is characterised in that the PFC
Circuit includes：
Input current sample circuit, the input current of power stage circuit is flowed into sample, and forms input current sampled signal；
Duty cycle signals generation circuit, receive the output voltage of the power stage circuit or the feedback compensation signal of output current and
The clock signal in fixed clock cycle, it is identical with the clock signal frequency to produce, and it is big to characterize the feedback compensation signal
Small duty cycle signals；
Reference voltage generating circuit, receives the duty cycle signals and busbar voltage sampled signal, to produce and bus electricity
The consistent reference voltage signal of corrugating；
Modulated signal producing circuit, receives the input current sampled signal and the reference voltage signal, to produce a modulation
Signal；
Logic and driver circuitry, receives the modulated signal, to produce corresponding control signal, to control the power stage circuit
The conducting state of middle power switch, it is ensured that input current waveform is consistent with busbar voltage waveform, and output voltage or electric current
Maintain substantially constant.
2. circuit of power factor correction according to claim 1, it is characterised in that input current sample circuit is connected to whole
Between current circuit and input filter capacitor.
3. circuit of power factor correction according to claim 2, it is characterised in that input current sample circuit includes：
First sampling resistor, is connected to the second output end of the rectification circuit and the second end of input filter capacitor is connected to ground
Common point between；
First output end of the rectification circuit and the first end of input filter capacitor are connected.
4. circuit of power factor correction according to claim 1, it is characterised in that the feedback compensation signal is mended for voltage
Repay signal.
5. circuit of power factor correction according to claim 4, it is characterised in that also include：
Voltage sampling circuit, is made up of assists winding and partial pressure sampling resistor, and the voltage of output voltage size is characterized to obtain
Feedback signal and the busbar voltage sampled signal；
Voltage compensating circuit, to produce voltage compensation signal according to the voltage feedback signal and the first reference voltage signal.
6. circuit of power factor correction according to claim 1, it is characterised in that the feedback compensation signal is mended for electric current
Repay signal.
7. circuit of power factor correction according to claim 6, it is characterised in that also include：
Current sampling circuit, to the electric current of power switch in sample streams overpower level circuit, current output electricity is characterized to produce
Flow the current feedback signal of size；
Current compensation circuit, to produce current compensation signal according to the current feedback signal and the second reference voltage signal.
8. the circuit of power factor correction according to claim 5 or 7, it is characterised in that the duty cycle signals produce electricity
Road includes：
Rest-set flip-flop, the set end of the rest-set flip-flop receives clock signal, and reset terminal receives reset signal, output duty cycle letter
Number；
Ramp signal generating circuit, to produce the second ramp voltage signal；
Comparator, the in-phase input end of the comparator receives second ramp voltage signal, and inverting input receives described
Voltage compensation signal or current compensation signal, export the reset signal.
9. circuit of power factor correction according to claim 8, it is characterised in that the ramp signal generating circuit includes
Second switch, current source and the 5th electric capacity；
The second switch, current source and the 5th electric capacity are connected in parallel, and the first common point in parallel generates the second ramp voltage signal,
Second common point ground connection in parallel；
The second switch is turned on when the duty cycle signals are low；
The current source charges when the second switch disconnects to the 5th electric capacity；
5th electric capacity discharges when the second switch is turned on.
10. circuit of power factor correction according to claim 1, it is characterised in that the reference voltage generating circuit bag
Include the 3rd switch, the 4th switch, the 6th resistance and the 6th electric capacity；
The first end of 3rd switch receives the busbar voltage sampled signal, the first end of the switch of the second termination the 4th and the
The common point of the first end of six resistance, the 3rd switch is turned on when duty cycle signals are high；
The second end ground connection of 4th switch, the 4th switch is turned on when duty cycle signals are low；
The first end of second the 6th electric capacity of termination of the 6th resistance；
Voltage on the second end ground connection of 6th electric capacity, the 6th electric capacity is reference voltage signal.
11. a kind of Switching Power Supply, it is characterised in that including：
Circuit of power factor correction according to any one of claim 1-10.
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| CN201510031164.5A CN104660028B (en) | 2015-01-22 | 2015-01-22 | A kind of circuit of power factor correction |
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| CN201510031164.5A CN104660028B (en) | 2015-01-22 | 2015-01-22 | A kind of circuit of power factor correction |
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| CN104660028B true CN104660028B (en) | 2017-09-29 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106953508B (en) * | 2017-04-19 | 2024-03-08 | 上海晶丰明源半导体股份有限公司 | Total harmonic distortion optimization circuit and method, driving controller and switching power supply system |
| CN108809072B (en) * | 2017-04-26 | 2020-10-30 | 泰达电子股份有限公司 | Phase compensation method suitable for power factor correction circuit |
| CN108336903A (en) * | 2018-03-13 | 2018-07-27 | 杰华特微电子（杭州）有限公司 | Control circuit and control method for reduction voltage circuit |
| CN111245225B (en) * | 2020-01-20 | 2021-09-21 | 杭州必易微电子有限公司 | Power supply conversion system and control circuit and current regulation method thereof |
| CN112865500B (en) * | 2021-04-13 | 2022-03-29 | 成都稳海半导体有限公司 | Ramp wave injection circuit based on ramp wave reset and error compensation method of switching power supply |
| CN112865501B (en) * | 2021-04-13 | 2022-03-29 | 成都稳海半导体有限公司 | Ramp wave injection circuit based on ramp wave reset and error compensation method in switching power supply |
| CN114594303B (en) * | 2022-05-10 | 2022-08-02 | 深圳英集芯科技股份有限公司 | Current sampling circuit and electronic equipment |
| CN114938131B (en) * | 2022-06-01 | 2023-02-28 | 晶艺半导体有限公司 | Control circuit and method of power factor correction circuit based on FLYBACK |
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| KR101532423B1 (en) * | 2008-10-31 | 2015-07-01 | 페어차일드코리아반도체 주식회사 | Power factor correction circuit and driving method thereof |
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| CN1531181A (en) * | 2003-03-10 | 2004-09-22 | ������������ʽ���� | Converter devices |
| TW201020555A (en) * | 2008-07-25 | 2010-06-01 | Cirrus Logic Inc | Current sensing in a switching power converter |
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