CN101789684A - Power factor corrector - Google Patents
Power factor corrector Download PDFInfo
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- CN101789684A CN101789684A CN201010118773A CN201010118773A CN101789684A CN 101789684 A CN101789684 A CN 101789684A CN 201010118773 A CN201010118773 A CN 201010118773A CN 201010118773 A CN201010118773 A CN 201010118773A CN 101789684 A CN101789684 A CN 101789684A
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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
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- 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
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Abstract
The invention discloses a power factor corrector. The power factor corrector comprises an input AC power supply Vac, a rectifier bridge, a PFC inductance, a switching tube, an output rectifier tube, an output filter capacitor, a load, a continuous current mode PFC control unit, an output voltage detection circuit and a current sampling resistance; in order to enable the power factor corrector to regulate the working frequency according to the amount of output current, the circuit also comprises an output current detecting and amplifying circuit and a voltage-controlled oscillator; and the output current detecting and amplifying circuit is connected between the negative pole of the load and the negative pole of the output filter capacitor, the output end thereof is connected at the input end of the voltage-controlled oscillator, and the output end of the voltage-controlled oscillator is connected at the frequency input end of the continuous current mode PFC control unit. The working frequency of the power factor corrector is regulated by the output current, thereby reducing the switching loss and the capacitive loss of the power factor corrector under the non-full load condition, and improving the average efficiency of the power factor corrector.
Description
Technical field
The present invention relates to a kind of power factor corrector (PFC), relate in particular to the power factor corrector that a kind of frequency is regulated by output current, belong to electric and electronic technical field.
Background technology
The power supply of computer, communication apparatus adopts traditional bridge rectifier, capacitor filter can make the AC input current produce serious wave distortion, inject a large amount of high order harmonic components to electrical network, therefore the power factor of net side is lower, only have about 0.6, and can cause serious harmonic pollution and interference electrical network and other electric equipment.As far back as the beginning of the eighties, people have caused concern to the harm that higher harmonic current caused that this class device produces.The formulation of the IEC555-2 of International Electrotechnical Commission " interference that household electrical appliance and similar electric equipment produce in electric power system, part 2: harmonic wave " standard impels numerous power electronic technology workers to begin harmonic and power factor correction (PFC) Study on Technology with enforcement.Introduce pfc circuit in the electronic power supply product, just can improve greatly to the utilization ratio of electric energy and harmonic pollution and be controlled within the scope that respective standard requires.PFC has two kinds, and a kind of is passive PFC (also claiming passive PFC), and another kind is active PFC (also symmetrical active PFC).Continuous current mode power factor corrector (CCM PFC) in active PFC (Active PFC) technology under the Average Current Control has characteristics such as power factor height, peak current is little, EMI is good and is widely used.Along with various energy-saving acts require to improve constantly to average efficiency, the efficient of the CCM PFC of middle power under non-fully loaded transportation condition is badly in need of promoting, in the hope of satisfying various energy-conservation requirements.Cao Lingling, Chen Ganhong disclose the efficiency analysis and the calculating of the power factor corrector of continuous current mode of operation in the literary composition of " time variant voltage DBPFC and BOOST PFC efficiency analysis pair with contrast " (airplane power source science and technology of aviation key lab is academic, and annual meeting---APSC ' 2009).Illustrated in the document that the main loss of the power factor corrector under traditional continuous mode is made up of the conduction loss of switch module and line resistance, the switching loss of switch module, the capacitive loss of switch element parasitic capacitance, wherein switching loss accounts for its major ingredients, switching loss is directly proportional conduction loss and frequency-independent with the capacitive loss with its operating frequency.Existing continuous mode power factor corrector is all worked with the steady job frequency in full operating range, the minimum value of this operating frequency is subject to the volume of maximum output current and minimum input voltage and PFC inductance under the situation of fixing output voltage, therefore under the volume situation of identical PFC inductance, fixing caused switching loss of operating frequency and capacitive loss are had a strong impact on system's efficient under the undercapacity situation, and influence is even more serious when underloading.
Summary of the invention
The objective of the invention is to defective at existing continuous mode power factor corrector, a kind of continuous mode power factor corrector of adjusting operating frequency according to the output current size is provided, reduce its switching loss and capacitive loss under the undercapacity condition, to improve the average efficiency of power factor corrector.
Purpose of the present invention is achieved by the following technical programs:
A kind of power factor corrector comprises input ac power Vac, rectifier bridge 1, PFC inductance 2, switching tube 3, output rectifying tube 4, output filter capacitor 5, load 7, continuous current mode PFC control unit 9, output voltage detecting circuit 10, current sampling resistor 11 compositions; Wherein the negative pole of output filter capacitor 5 is defined as ground, the input of described rectifier bridge 1 is connected in AC power Vac, one end of the output cathode series connection PFC inductance 2 of rectifier bridge 1, the anode of the drain electrode of the other end of PFC inductance 2 and switching tube 3 and output rectifying tube 4 connects same point altogether, the source ground of switching tube 3, the grid of switching tube 3 is the signal output part of continuous current-mode PFC control unit 9 in succession, the negative electrode of output rectifying tube 4 and the positive pole of output filter capacitor 5, the positive pole of load 7 connects, output voltage detecting circuit 10 is by resistance R 1, resistance R 2 is formed, one end of resistance R 1 is connected to the negative electrode of output rectifying tube 4, the other end is connected with an end of resistance R 2, resistance R 2 other end ground connection, current sampling resistor 11 is connected between the output negative terminal of the source electrode of switching tube 3 and rectifier bridge 1, the negative pole of output filter capacitor 5 is connected to the source electrode of switching tube 3, the negative pole of load 7 is connected with the negative pole of output filter capacitor 5, above-mentioned PFC inductance 2 two ends, between the source electrode of switching tube 3 and the drain electrode, parasitic capacitance in parallel separately between output rectifying tube 4 both positive and negative polarities.Can adjust operating frequency according to the output current size in order to make power factor corrector, this circuit comprises that also output current detects amplifying circuit 6, voltage controlled oscillator 8, described output current detects between the negative pole that amplifying circuit 6 is connected in the negative pole of load 7 and output filter capacitor 5, the output load current signal is detected and handles, described output current detects the input that amplifying circuit 6 outputs are connected in voltage controlled oscillator 8, export a control signal and give voltage controlled oscillator 8, voltage controlled oscillator 8 produces the sawtooth waveforms Fs of a respective frequencies, the output of voltage controlled oscillator 8 is connected in the frequency input of continuous current mode PFC control unit 9, sawtooth waveforms Fs is delivered to continuous current mode PFC control unit 9, thus the operating frequency of control switch pipe 3.
Purpose of the present invention can also further realize by following technical measures:
Aforementioned a kind of power factor corrector, wherein output current detection amplifying circuit 6 comprises resistance R
Sen2, resistance R
I3, resistance R
F1, capacitor C
Z1, current error amplifier U1, described resistance R
Sen2Two ends are connected between the negative pole of the negative pole of load 7 and output filter capacitor 5, described resistance R
I3An end be connected in the negative pole of output filter capacitor 5, the other end is connected in the input negative terminal of current error amplifier U1, the positive termination reference voltage V of the input of current error amplifier U1
Ref2, the output of current error amplifier U1 is connected in the input of voltage controlled oscillator 8, described resistance R
F1, capacitor C
Z1Series connection, series circuit one end is connected with the input negative terminal of current error amplifier U1, and the series circuit other end is connected with the output of current error amplifier U1.
Aforementioned a kind of power factor corrector, wherein continuous current mode PFC control unit 9 comprises current error amplifier U2, multiplier U3, PWM generator U4, low pass filter LPF, voltage error amplifier V
EA, output driving circuit, squaring circuit X
2, resistance R
IAC, resistance R
I2, resistance R
3, resistance R
F2, capacitor C
p, capacitor C
Z2Described resistance R
IACOne end is connected in the output cathode of rectifier bridge 1, and the other end is connected in the input of multiplier U3 and the input of low pass filter LPF, and the output of low pass filter LPF is connected in squaring circuit X
2Input, squaring circuit X
2Output be connected in the input of multiplier U3; Voltage error amplifier V
EAThe input negative terminal be connected between resistance R 1, the resistance R 2 voltage error amplifier V
EAThe positive termination reference voltage V of input
Ref1, its output is connected in the input of multiplier U3; Described resistance R
I2An end be connected in the output negative pole of rectifier bridge 1, the other end is connected in the output of multiplier U3, the input negative terminal of current error amplifier U2 links to each other with the output of multiplier U3, the input anode of current error amplifier U2 is connected in resistance R
3An end, resistance R
3Other end ground connection, resistance R
F2With capacitor C
Z2Series connection, series circuit and capacitor C
pParallel connection, this parallel circuits one is terminated at the input negative terminal of current error amplifier U2, and the other end is connected to the output of current error amplifier U2; The input negative terminal of described PWM generator U4 links to each other with the output of current error amplifier U2, the input anode of PWM generator U4 is connected with the output of voltage controlled oscillator 8, the output of PWM generator U4 is connected in the output driving circuit input, and the output driving circuit output connects the grid of switching tube 3.
Compared with prior art, the invention has the beneficial effects as follows: thus because the operating frequency of power factor corrector is subjected to output current regulating to reduce switching loss and the capacitive loss of power factor corrector under the undercapacity condition, promoted the average efficiency of power factor corrector.
Description of drawings
Fig. 1 is circuit theory diagrams of the present invention.
Fig. 2 is that its operating frequency is 85KHz under the traditional C CM PFC fixed frequency condition, and input voltage is respectively 100V, 160V, 264V, the efficient when output voltage is 390V and the relation curve of load.
Fig. 3 is that apparatus of the present invention are subjected under the output current adjusting pattern in frequency, and its maximum operation frequency is 85KHz, and minimum frequency of operation is 45KHz, and input voltage is respectively 100V, 160V, 264V, the efficient when output voltage is 390V and the relation curve of load.
Fig. 4 is that its operating frequency is 85KHz under the traditional C CM PFC fixed frequency condition, and output voltage is 390V, the efficient when output current is respectively 0.3A and 0.5A and the relation curve of input voltage.
Fig. 5 is that apparatus of the present invention are subjected under the output current adjusting pattern in frequency, and its maximum operation frequency is 85KHz, and minimum frequency of operation is 45KHz, and output voltage is 390V, the efficient when output current is respectively 0.3A and 0.5A and the relation curve of input voltage.
Embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, the present invention includes input ac power Vac, rectifier bridge 1, PFC inductance 2, switching tube 3, output rectifying tube 4, output filter capacitor 5, load 7, continuous current mode PFC control unit 9, output voltage detecting circuit 10, current sampling resistor 11 compositions, wherein the negative pole of output filter capacitor 5 is defined as ground.The input of described rectifier bridge 1 is connected in AC power Vac, one end of the output cathode series connection PFC inductance 2 of rectifier bridge 1, the anode of the drain electrode of the other end of PFC inductance 2 and switching tube 3 and output rectifying tube 4 connects same point altogether, the source ground of switching tube 3, the grid of switching tube 3 is the signal output part of continuous current-mode PFC control unit 9 in succession, the negative electrode of output rectifying tube 4 and the positive pole of output filter capacitor 5, the positive pole of load 7 connects, output voltage detecting circuit 10 is by resistance R 1, resistance R 2 is formed, one end of resistance R 1 is connected to the negative electrode of output rectifying tube 4, the other end is connected with an end of resistance R 2, resistance R 2 other end ground connection, current sampling resistor 11 is connected between the output negative terminal of the source electrode of switching tube 3 and rectifier bridge 1, the negative pole of output filter capacitor 5 is connected to the source electrode of switching tube 3, the negative pole of load 7 is connected with the negative pole of output filter capacitor 5, above-mentioned PFC inductance 2 two ends, between the source electrode of switching tube 3 and the drain electrode, parasitic capacitance in parallel separately between output rectifying tube 4 both positive and negative polarities.In order to make power factor corrector adjust operating frequency according to the output current size, this circuit comprises that also output current detects amplifying circuit 6, voltage controlled oscillator 8.Described output current detects between the negative pole that amplifying circuit 6 is connected in the negative pole of load 7 and output filter capacitor 5, and the output load current signal is detected and handles, and concrete output current detects amplifying circuit 6 and comprises resistance R
Sen2, resistance R
I3, resistance R
F1, capacitor C
Z1, current error amplifier U1, described resistance R
Sen2Two ends are connected between the negative pole of the negative pole of load 7 and output filter capacitor 5, described resistance R
I3An end be connected in the negative pole of output filter capacitor 5, the other end is connected in the input negative terminal of current error amplifier U1, the positive termination reference voltage V of the input of current error amplifier U1
Ref2, the output of current error amplifier U1 is connected in the input of voltage controlled oscillator 8, described resistance R
F1, capacitor C
Z1Series connection, series circuit one end is connected with the input negative terminal of current error amplifier U1, and the series circuit other end is connected with the output of current error amplifier U1.
Aforesaid continuous current mode PFC control unit 9 specifically comprises current error amplifier U2, multiplier U3.PWM generator U4, low pass filter LPF, voltage error amplifier V
EA, output driving circuit, squaring circuit X
2, resistance R
IAC, resistance R
I2, resistance R
3, resistance R
F2, capacitor C
p, capacitor C
Z2Described resistance R
IACOne end is connected in the output cathode of rectifier bridge 1, and the other end is connected in the input of multiplier U3 and the input of low pass filter LPF, and the output of low pass filter LPF is connected in squaring circuit X
2Input, squaring circuit X
2Output be connected in the input of multiplier U3; Voltage error amplifier V
EAThe input negative terminal be connected between resistance R 1, the resistance R 2 voltage error amplifier V
EAThe positive termination reference voltage V of input
Ref1, its output is connected in the input of multiplier U3; Described resistance R
I2An end be connected in the output negative pole of rectifier bridge 1, the other end is connected in the output of multiplier U3, the input negative terminal of current error amplifier U2 links to each other with the output of multiplier U3, the input anode of current error amplifier U2 is connected in resistance R
3An end, resistance R
3Other end ground connection, resistance R
F2With capacitor C
Z2Series connection, series circuit and capacitor C
pParallel connection, this parallel circuits one is terminated at the input negative terminal of current error amplifier U2, and the other end is connected to the output of current error amplifier U2; The input negative terminal of described PWM generator U4 links to each other with the output of current error amplifier U2, the input anode of PWM generator U4 is connected with the output of voltage controlled oscillator 8, voltage controlled oscillator 8 is delivered to PWM generator U4 with the sawtooth waveforms Fs of its generation, the output of PWM generator U4 is connected in the output driving circuit input, the output driving circuit output connects the grid of switching tube 3, thus the operating frequency of removing control switch pipe 3 by the generation of sawtooth waveforms Fs control PWM ripple like this.
The control strategy that the present invention adopts is certain corresponding certain switch operating frequency of load, and the corresponding relation of its frequency and output current can be linear, non-linear and other corresponding relation, and this operating frequency is not subjected to the influence of input voltage size or shape.Its working condition is identical with existing continuous mode power factor corrector under full load conditions.Confirmed following condition establishment before analyzing this circuit: (1) continuous current mode PFC control unit 9 is the continuous current mode power factor correcting device of telotism, and its operating frequency is provided by the outside.(2) the current sample mode is a resistance sampling.(3) load minimum current is Imin, and corresponding minimum frequency of operation is Fs_min, and the load maximum current is Imax, and corresponding maximum operation frequency is Fs_max, and Io is a load current, Fs be the switching tube operating frequency and: Imin≤Io≤Imax; Fs_min≤Fs≤Fs_max.
Main circuit of the present invention is made up of PFC inductance 2, switching tube 3, output rectifying tube 4, output filter capacitor 5, and its topology is the Boost circuit.Ac grid voltage Vac input is after rectification obtains commutating voltage Vin, switching tube 3 ends earlier, after electric capacity is charged to certain value, switching tube 3 begins according to the conducting of PWM rule and ends, storage and release with control inductance self-energy, and pass through output rectifying tube 4 to output filter capacitor 5 chargings, and be sent to load 7, finish the function that alternating voltage is transferred to direct voltage.Control circuit is made up of the two large divisions, and a part is continuous current mode PFC control unit 9 (CCM PFC Control), and it is by voltage error amplifier V
EA, current error amplifier U2, multiplier U3, PWM generator U4, low pass filter LPF compositions such as (Low pass filter); Another part is the Current Control frequency cells, and it detects amplifying circuit 6 (Current Detecting Unit) by output current and voltage controlled oscillator is formed.The output voltage detecting circuit 10 that Voltage loop in the closed-loop system is made up of resistor voltage divider network, voltage error amplifier V
EA, multiplier U3, current error amplifier U2, compositions such as PWM generator U4.Its form is similar to the Voltage loop in the general voltage control pulse modulation technique, to reach the purpose that keeps output voltage stabilization.Electric current loop in the closed-loop system is by current sampling resistor 11, current error amplifier U2,, PWM generator U4 forms.The output voltage V out sampling value and the reference voltage V ref1 of main circuit input to voltage error amplifier V
EAThe detected value K of voltage Vin after the rectification and voltage error amplifier VEA output voltage V va are added to the input of multiplier U3 jointly.The output signal Vm of multiplier U3 is as the reference signal of Current Feedback Control signal, therefore current reference signal is two half-sine waves, detected value Iin * Rsen1 of it and input current Iin relatively after, be added to PWM generator U4 through current error amplifier U2 and produce pwm signal, with the break-make of switching tube in the control Boost DC/DC converter.Thereby make the waveform basically identical of the waveform of input current Iin and the voltage Vin after the rectification, and same-phase.So just make that current harmonics greatly reduces, thereby improved power factor.The frequency control loop course of work of this circuit is: output current detects amplifying circuit 6 by detection and processing to output load current, export a control signal Vo and this signal is delivered to the input of voltage controlled oscillator, voltage controlled oscillator produces the sawtooth waveforms Fs of a respective frequencies, sawtooth waveforms Fs signal send the synchronous signal input end of continuous current mode PFC control unit 9, be the input anode of PWM generator U4, with the operating frequency of control switch pipe.
According to Cao Lingling, the efficiency analysis of Chen Ganhong power factor corrector of disclosed continuous current mode of operation in " time variant voltage DBPFC and BOOST PFC efficiency analysis pair with contrast " (airplane power source science and technology of aviation key lab is academic, and annual meeting---APSC ' 2009) with calculate and can know, the main loss of the power factor corrector of tradition under the continuous mode is made up of the conduction loss of switch module and line resistance and the switching loss of switch module and the capacitive loss of switch element parasitic capacitance, wherein switching loss accounts for its major ingredients, switching loss is directly proportional with its operating frequency with the capacitive loss, conduction loss and frequency-independent, relevant result calculated is as follows:
The turn-off power loss P of 1 output rectifier diode
Diode_off=K
1FS_pfc
2 switching tube turn-on consumption P
Sw_on=K
2FS_pfc
3 switching tube turn-off power loss P
Sw_off=K
3FS_pfc
The parasitic capacitance loss P of 4 switching tubes, output diode, inductance
Sw_c=K
4FS_pfc
(K
1, K
2, K
3, K
4Be the coefficient relevant) with component parameters
Reduce operating frequency as shown from the above formula and will reduce overall loss, at output voltage one regularly, the setting of minimum frequency of operation is subject to the volume of maximum output current and minimum input voltage and PFC inductance, therefore under the volume situation of identical PFC inductance, fixing caused switching loss of operating frequency and capacitive loss are had a strong impact on system's efficient under the undercapacity situation, and influence is even more serious when underloading.Utilization of the present invention peak inrush current by the PFC inductance when output current reduces will reduce, the applicable AC magnetism induction of its magnetic core this moment will become big, thereby the value permission of the forward weber of inductance becomes big, under the constant situation of duty ratio, reduce its operating frequency, reduce the switching loss and the capacitive loss of system, can improve the efficient of CCM PFC power factor corrector under the undercapacity situation effectively.
The present invention carries out actual verification on the power factor corrector of 200W, and traditional C CM PFC controlling schemes efficient that obtains and the efficient that obtains with apparatus of the present invention (frequency is subjected to the power factor corrector of the continuous mode of output current adjusting) are compared.
Fig. 2 is that its operating frequency is 85KHz under the traditional C CM PFC fixed frequency condition, and input voltage is respectively 100V, 160V, 264V, the efficient when output voltage is 390V and the relation curve of load.
Fig. 3 is that apparatus of the present invention are subjected under the output current adjusting pattern in frequency, and its maximum operation frequency is 85KHz, and minimum frequency of operation is 45KHz, and input voltage is respectively 100V, 160V, 264V, the efficient when output voltage is 390V and the relation curve of load.
Fig. 4 is that its operating frequency is 85KHz under the traditional C CM PFC fixed frequency condition, and output voltage is 390V, the efficient when output current is respectively 0.3A and 0.5A and the relation curve of input voltage.
Fig. 5 is that apparatus of the present invention are subjected under the output current adjusting pattern in frequency, and its maximum operation frequency is 85KHz, and minimum frequency of operation is 45KHz, and output voltage is 390V, the efficient when output current is respectively 0.3A and 0.5A and the relation curve of input voltage.
Can find that from the contrast of contrast, Fig. 4 and Fig. 5 of Fig. 2 and Fig. 3 apparatus of the present invention can improve the average efficiency of power factor corrector under the undercapacity condition greatly.
In addition to the implementation, the present invention can also have other execution modes, and all employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop in the protection range of requirement of the present invention.
Claims (3)
1. a power factor corrector comprises input ac power Vac, rectifier bridge (1), PFC inductance (2), switching tube (3), output rectifying tube (4), output filter capacitor (5), load (7), continuous current mode PFC control unit (9), output voltage detecting circuit (10), current sampling resistor (11); Wherein the negative pole of output filter capacitor (5) is defined as ground, the input of described rectifier bridge (1) is connected in AC power Vac, one end of the output cathode series connection PFC inductance (2) of rectifier bridge (1), the anode of the drain electrode of the other end of PFC inductance (2) and switching tube (3) and output rectifying tube (4) connects same point altogether, the source ground of switching tube (3), the grid of switching tube (3) is the signal output part of Discontinuous Conduction mode PFC control unit (9) in succession, the negative electrode of output rectifying tube (4) and the positive pole of output filter capacitor (5), the positive pole of load (7) connects, output voltage detecting circuit (10) is by resistance R 1, resistance R 2 is formed, one end of resistance R 1 is connected to the negative electrode of output rectifying tube (4), the other end is connected with an end of resistance R 2, resistance R 2 other end ground connection, current sampling resistor (11) is connected between the output negative terminal of the source electrode of switching tube (3) and rectifier bridge (1), the negative pole of output filter capacitor (5) is connected to the source electrode of switching tube (3), the negative pole of load (7) is connected with the negative pole of output filter capacitor (5), above-mentioned PFC inductance (2) two ends, between the source electrode of switching tube (3) and the drain electrode, parasitic capacitance in parallel separately between output rectifying tube (4) both positive and negative polarity, it is characterized in that, comprise that also output current detects amplifying circuit (6), voltage controlled oscillator (8), described output current detects between the negative pole that amplifying circuit (6) is connected in the negative pole of load (7) and output filter capacitor (5), the output load current signal is detected and handles, described output current detects the input that amplifying circuit (6) output is connected in voltage controlled oscillator (8), export a control signal and give voltage controlled oscillator (8), voltage controlled oscillator (8) produces the sawtooth waveforms Fs of a respective frequencies, the output of voltage controlled oscillator (8) is connected in the frequency input of continuous current mode PFC control unit (9), sawtooth waveforms Fs is delivered to continuous current mode PFC control unit (9), thus the operating frequency of control switch pipe (3).
2. a kind of power factor corrector as claimed in claim 1,, it is characterized in that described output current detects amplifying circuit (6) and comprises resistance R
Sen2, resistance R
I3, resistance R
F1, capacitor C
Z1, current error amplifier U1, described resistance R
Sen2Two ends are connected between the negative pole of the negative pole of load (7) and output filter capacitor (5), described resistance R
I3An end be connected in the negative pole of output filter capacitor (5), the other end is connected in the input negative terminal of current error amplifier U1, the positive termination reference voltage V of the input of current error amplifier U1
Ref2, the output of current error amplifier U1 is connected in the input of voltage controlled oscillator (8), described resistance R
F1, capacitor C
Z1Series connection, series circuit one end is connected with the input negative terminal of current error amplifier U1, and the series circuit other end is connected with the output of current error amplifier U1.
3. a kind of power factor corrector as claimed in claim 2,, it is characterized in that described continuous current mode PFC control unit (9) comprises current error amplifier U2, multiplier U3, PWM generator U4, low pass filter LPF, voltage error amplifier V
EA, output driving circuit, squaring circuit X
2, resistance R
IAC, resistance R
I2, resistance R
3, resistance R
F2, capacitor C
p, capacitor C
Z2Described resistance R
IACOne end is connected in the output cathode of rectifier bridge (1), and the other end is connected in the input of multiplier U3 and the input of low pass filter LPF, and the output of low pass filter LPF is connected in squaring circuit X
2Input, squaring circuit X
2Output be connected in the input of multiplier U3; Voltage error amplifier V
EAThe input negative terminal be connected between resistance R 1, the resistance R 2 voltage error amplifier V
EAThe positive termination reference voltage V of input
Ref1, its output is connected in the input of multiplier U3; Described resistance R
I2An end be connected in the output negative pole of rectifier bridge (1), the other end is connected in the output of multiplier U3, the input negative terminal of current error amplifier U2 links to each other with the output of multiplier U3, the input anode of current error amplifier U2 is connected in resistance R
3An end, resistance R
3Other end ground connection, resistance R
F2With capacitor C
Z2Series connection, series circuit and capacitor C
pParallel connection, this parallel circuits one is terminated at the input negative terminal of current error amplifier U2, and the other end is connected to the output of current error amplifier U2; The input negative terminal of described PWM generator U4 links to each other with the output of current error amplifier U2, the input anode of PWM generator U4 is connected with the output of voltage controlled oscillator (8), the output of PWM generator U4 is connected in the output driving circuit input, and the output driving circuit output connects switching tube (3) grid.
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| CN101951139A (en) * | 2010-09-28 | 2011-01-19 | 矽创电子股份有限公司 | Power factor correction circuit of power converter |
| CN102290972A (en) * | 2011-08-15 | 2011-12-21 | 成都芯源系统有限公司 | Switching power supply and control circuit and control method thereof |
| CN102468745A (en) * | 2010-11-08 | 2012-05-23 | Nxp股份有限公司 | Power factor controller with error feedback, and a method of operating such |
| CN102594135A (en) * | 2012-02-29 | 2012-07-18 | 杭州矽力杰半导体技术有限公司 | Boost PFC controller |
| CN102710157A (en) * | 2011-03-28 | 2012-10-03 | 旭丽电子(广州)有限公司 | Power factor correction boost converter and switching frequency modulation method thereof |
| CN103108432A (en) * | 2011-11-11 | 2013-05-15 | 欧司朗股份有限公司 | Light-emitting diode (LED) driver and LED illuminating device with the same |
| CN103166446A (en) * | 2011-12-13 | 2013-06-19 | 万国半导体(开曼)股份有限公司 | Power factor correcting device and correcting method thereof |
| CN103607104A (en) * | 2013-11-22 | 2014-02-26 | 乐金电子研发中心(上海)有限公司 | Sine wave modulation circuit and sine wave modulation method |
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| CN108490483A (en) * | 2018-04-17 | 2018-09-04 | 山东省科学院激光研究所 | Signal transmitting apparatus and system |
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| CN112803753A (en) * | 2021-03-25 | 2021-05-14 | 毛昭祺 | Power factor correction converter |
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