CN101951139B - The power factor correction circuit of power converter - Google Patents
The power factor correction circuit of power converter Download PDFInfo
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- CN101951139B CN101951139B CN201010299928.6A CN201010299928A CN101951139B CN 101951139 B CN101951139 B CN 101951139B CN 201010299928 A CN201010299928 A CN 201010299928A CN 101951139 B CN101951139 B CN 101951139B
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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
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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
- 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 present invention relates to a kind of power factor correction circuit of power converter, it couples a power converter, in order to a power factor of Modulating Power transducer, power factor correction is by the output signal of a voltage feedback circuit according to power converter, produce a voltage commands signal, one voltage input signal of computing circuit received power transducer and a current sense signal and voltage commands signal, union circuit produces a multiplication signal according to voltage input signal and voltage commands signal, and produce one first reference signal according to voltage input signal and a current sense signal, afterwards, computing circuit produces a control signal according to multiplication signal and the first reference signal again, commutation circuit is according to controlling signal and one second reference signal, and produce a switching signal, in order to a switch of switchover power converter.So, the present invention avoids by multiplier using divider, makes power factor correction circuit structure simple, and then reaches the volume reducing power factor correction circuit, and can reach the object reducing cost.
Description
Technical field
The invention relates to a kind of power factor correction circuit, it is espespecially a kind of power factor correction circuit of power converter.
Background technology
Now the dealer of power supply unit pursue high-quality power supply and demand be always world community want the target reached, but the unique channel that a large amount of construction power plant not deals with problems, improve the energy of electric power supply on the one hand, the power factor (Power Factor) or the efficiency that improve electric equipment products on the one hand could effectively be dealt with problems.And power factor corrector (power factor corrector) its Main Function makes the input voltage of electric equipment products identical with the phase place of input current, and make the load of electric equipment products be similar to resistive load, to reach the high power factor of power supply.
Power factor corrector mainly divides three kinds, the first is critical conduction mode power factor corrector (Critical conduction mode, CRM PFC), the second is discrete power factor corrector (Discontinuous current Conduction Mode, DCM PFC) is continuous type power factor corrector (Continuous current Conduction Mode CCM PFC) with the third.
Referring to Fig. 1, is the circuit diagram of the power factor correction circuit of prior art.As shown in the figure, the power factor correction circuit of prior art is continuous type power factor corrector (CCM PFC), its conventional control mode is so-called average current (average current) control model, as in Fig. 1, when AC power AC becomes the input voltage vin of the similar m shape of waveform through a bridge rectifier 10 ' rectification, one computing circuit 20 ' obtains voltage error signal A through voltage circuit compensating circuit 30 ' or is called voltage commands, the difference of output voltage Vout*Kf and expectation (reference) voltage Vref produces a voltage error signal A via a compensating circuit, taken out square signal (i.e. C^2 signal) of the mean value C of an input signal B and input voltage vin by input voltage vin through a front end circuit 40 ' simultaneously.One multiplier 22 ' of computing circuit 20 ' carries out processing being multiplied of voltage error signal A and input signal B, and then with a divider 24 ' of computing circuit 20 ' divided by a square signal C^2, in order to export the current order signal Iref of the similar m shape of a waveform.Why will divided by a square signal C^2 in computing circuit 20 ', because do not wish that the merit of power factor corrector changes along with input voltage vin size because of value, if and voltage error signal A considers in output voltage fluctuation situation, still change the switching of transistor Q by control circuit 50 ' and reach voltage regulation result.
Seeing also Fig. 2, is the waveform schematic diagram of the power factor correction circuit of Fig. 1.As shown in the figure, gate drive pulse wave VG is that triangular wave Ipwm and current order signal Ic make comparisons the result of gained after computing.The work period of gate drive pulse wave VG near current order signal Ic trough is the widest and the narrowest near crest, in fig. 2, can find out and control transistor Q via gate drive pulse wave VG and obtain the current waveform iL of inductance L, this current waveform iL can obtain the current waveform iL (avg) of an approximate string ripple after the electric capacity Cin filtering of input at input.The current waveform of this approximate string ripple can with input voltage vin same-phase, and reach merit because of correction.In above-mentioned explanation mention the mode utilizing computing circuit 20 ', produce input current waveform and the synchronous result of input voltage vin of approximate string ripple, and reach the correction of power factor.
Owing to using divider 24 ' in computing circuit 20 ', its individual elements number is many, design is complicated.Therefore, how propose a kind of power factor correction circuit of novel power converter for the problems referred to above, it can avoid using divider, makes power factor correction circuit simplicity of design, and then reduces cost, makes to solve the above problems.
Prior art:
10 ' bridge rectifier 20 ' computing circuit
22 ' multiplier 24 ' divider
30 ' voltage amplifier 40 ' front end circuit
50 ' control circuit
The present invention:
1 power factor correction circuit 10 voltage feedback circuit
100 voltage circuit compensator 102 the 3rd adjusters
12 computing circuit 120 first reference signal produce circuit
1201 second multiplier 1202 the 3rd multipliers
1203 arithmetic element 1,204 first adjusters
1206 second adjuster 1208 low pass filters
122 first multiplier 124 current loop compensator
14 commutation circuit 2 power converters
20 rectification circuits
Summary of the invention
Of the present invention one of mainly, be the power factor correction circuit that a kind of power converter is provided, it avoids by a multiplier using divider, make power factor correction circuit structure simple, and then reach the volume reducing power factor correction circuit, and make power factor correction circuit structure simple, and then reduce the object of cost.
To achieve the above object, the present invention is a kind of power factor correction circuit of power converter, and it couples a power converter, and in order to adjust a power factor of this power converter, this power factor correction circuit comprises:
One voltage feedback circuit, couples an output of this power converter, and according to an output signal of this power converter, produces a voltage commands signal;
One computing circuit, couple an input and this voltage feedback circuit of this power converter, and receive an input signal of this power converter, a current sense signal and this voltage commands signal, this computing circuit produces a multiplication signal according to this voltage input signal and this voltage commands signal, and producing one first reference signal according to this voltage input signal and this current sense signal, this computing circuit produces a control signal according to this multiplication signal and this first reference signal again; And
One commutation circuit, couples this computing circuit, and according to this control signal and one second reference signal, and produce a switching signal, in order to switch a switch of this power converter.
In the present invention, wherein this computing circuit comprises:
One first reference signal produces circuit, couples this input of this power converter, and according to this voltage input signal and this current sense signal, and produce this first reference signal;
One first multiplier, couples this input and this voltage feedback circuit of this power converter, and be multiplied this voltage commands signal and this voltage input signal, and produce this multiplication signal; And
One current loop compensator, couples this first reference signal and produces circuit and this first multiplier, and compare this first reference signal and this multiplication signal, and produce this control signal.
In the present invention, wherein this first reference signal generation circuit comprises:
One second multiplier, couples this input of this power converter, and be multiplied this voltage input signal and this current sense signal, and produce this first reference signal.
In the present invention, wherein this first reference signal generation circuit more comprises:
One the 3rd multiplier, couples this input of this power converter, and square this voltage input signal, and this voltage input signal after transmitting square is to this second multiplier.
In the present invention, wherein this first reference signal generation circuit more comprises:
One arithmetic element, couples this input of this power converter, and according to a corresponding table square this voltage input signal, and this voltage input signal after transmitting square is to this second multiplier.
In the present invention, wherein this first reference signal generation circuit more comprises:
One first adjuster, in order to adjust the intensity of this input signal; And
One second adjuster, in order to adjust the intensity of this sensing signal.
In the present invention, wherein this first reference signal generation circuit more comprises:
One low pass filter, couples this input of this power converter, and filters this voltage input signal, and transmits this voltage input signal after filtering to this second multiplier.
In the present invention, wherein this feedback circuit comprises:
One voltage circuit compensator, couples this output of this power converter, and compares this output signal and a door signal, and produces this voltage commands signal.
In the present invention, wherein this voltage feedback circuit more comprises:
One adjuster, couples this output of this power converter, in order to adjust the intensity of this output signal, and this output signal after adjustment is sent to this voltage circuit compensator.
In the present invention, wherein this commutation circuit comprises:
One current loop compensator, couples this computing circuit and this power converter, and compares this control signal and the second reference signal, and produces this switching signal.
The beneficial effect that the present invention has: the present invention avoids by a multiplier using divider, makes power factor correction circuit structure simple, and then reaches the volume reducing power factor correction circuit, and can reach the object reducing cost.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the power factor correction circuit of prior art;
Fig. 2 is the waveform schematic diagram of the power factor correction circuit of Fig. 1;
Fig. 3 is the circuit diagram of a preferred embodiment of the present invention; And
Fig. 4 is the circuit diagram of another preferred embodiment of the present invention.
[figure number is to as directed]
Embodiment
For making to have a better understanding and awareness architectural feature of the present invention and effect of reaching, coordinating detailed description in order to preferred embodiment and accompanying drawing, being described as follows:
Referring to Fig. 3, is the circuit diagram of a preferred embodiment of the present invention.As shown in the figure, the power factor correction circuit 1 of power converter of the present invention couples a power converter 2, in order to a power factor of Modulating Power transducer 2, this power factor correction circuit 1 comprises voltage feedback circuit 10, computing circuit 12 and a commutation circuit 14.Voltage feedback circuit 10 is the outputs coupling power converter 2, voltage feedback circuit 10 produces a voltage commands signal Vea according to an output signal Vout of power converter 2, namely voltage feedback circuit 10 produces voltage commands signal Vea according to the output signal Vout of power converter 2 and the voltage difference of reference voltage Vref via a compensating circuit (i.e. voltage circuit compensator 100), common compensating circuit implementation is a ratio (Proportional, P) controller, one proportional integral (Proportional-Integral, PI) controller or a proportion integration differentiation (Proportional-Integral-Differental, PID) controller, computing circuit 12 is the voltage input ends coupling power converter 2, current input terminal and voltage feedback circuit 10, one voltage input signal Vin of a computing circuit 12 received power transducer 2 and current sense signal I and voltage commands signal Vea, wherein voltage input signal Vin is the input signal that AC power signal Vac produces after rectification circuit 20 rectification of power converter 2, voltage input signal Vin produces signal B via one first adjuster 1204 and is multiplied with voltage commands signal Vea and produces a multiplication signal Iref, union circuit 12 produces one first reference signal Isen according to input voltage signal Vin and current sensor signal I, afterwards, computing circuit 12 produces a control signal Ic according to multiplication signal Iref and the first reference signal Isen via a current loop compensator 124 again, commutation circuit 14 is coupled to computing circuit 12, commutation circuit 14 is according to control signal and one second reference signal Ipwm, and produce a switching signal, in order to a switch Q of switchover power converter 2, wherein, switch Q is a power switch, and be a field-effect transistor (MOS FET).So, the present invention avoids by computing circuit 12 using divider, makes power factor correction circuit 1 structure more simple, and then reaches the volume reducing power factor correction circuit 1, and can reach the object reducing cost.Wherein, the second reference signal Ipwm is a sawtooth waveforms signal.
From the above, computing circuit 12 of the present invention comprises one first reference signal generation circuit 120,1 first multiplier 122 and a current loop compensation 124.It is the inputs coupling power converter 2 that first reference signal produces circuit 120, and the first reference signal generation circuit 120 produces multiplication signal Iref according to voltage input signal Vin and current sense signal I, first multiplier 122 is the input and the voltage feedback circuit 10 that couple power converter 2, and the first multiplier 122 multiplied voltage command signal Vea and voltage input signal Vin, wherein, voltage input signal Vin also can be passed through the first amplifier 1204, and make the first multiplier 122 can multiplied voltage command signal Vea and input signal (Vin*Kv), and produce multiplication signal Iref current loop compensator 124 and couple the first reference signal and produce circuit 120 and the first multiplier 122, current loop compensator 124 compares the first reference signal Isen and multiplication signal Iref, and produce control signal Ic, to be sent to commutation circuit 14.So, computing circuit 12 of the present invention only uses the first multiplier 122, and does not use divider, makes power factor correction circuit structure simple, and then reaches the volume reducing power factor correction circuit, and reduce its cost.
The first above-mentioned reference signal produces circuit 120 and comprises one second multiplier 1200, the 3rd multiplier 1202, first adjuster 1204,1 second adjuster 1206 and a low pass filter 1208.First adjuster 1204 is the intensity adjusting voltage input signal Vin, in this embodiment, first adjuster 1204 is in order to zoom in/out voltage input signal Vin, and the voltage input signal Vin after adjustment is sent to filter 1208 and the first multiplier 122.In addition, the first adjuster 1204 more produces a signal B, and signal B is sent to the first multiplier 122.Second adjuster 1206 is the intensity adjusting current sense signal I, i.e. this current sense signal of zoom in/out I, and the current sense signal I after adjustment is sent to the second multiplier 1200.Second multiplier 1200 is the inputs coupling power converter 2, and square signal of the mean value C of multiplied voltage input signal Vin (i.e. C^2 signal) and current sense signal I, and produce the first reference signal Isen, 3rd multiplier 1202 is the outputs being coupled to low pass filter 1208, and produce square signal (i.e. C^2 signal) of the mean value C of voltage input signal Vin, and transmit square signal to the second multiplier 1200 of the mean value C of voltage input signal Vin.Low pass filter 1208 is the inputs coupling power converter 2, and filtered voltage input signal Vin, and calculate the mean value of voltage input signal Vin.
In addition, the present invention can use an arithmetic element 1203 to replace the 3rd multiplier 1202 (as shown in Figure 4), arithmetic element 1203 is the inputs coupling power converter 2, and show and squared voltage input signal Vin according to a correspondence, and transmit square after voltage input signal Vin to the second multiplier 1200, in this embodiment, arithmetic element 1203 is the outputs being coupled to low pass filter 1208, and produce square signal (i.e. C^2 signal) of the mean value C of voltage input signal Vin, and transmit square signal to the second multiplier 1200 of the mean value C of voltage input signal Vin.
Please consult Fig. 3 again, voltage feedback circuit 10 comprises voltage circuit compensator 100 and one the 3rd adjuster 102.Voltage circuit compensator 100 is the output and the computing circuit 12 that couple power converter 2, and voltage circuit compensator 100 compares an output signal Vout and door signal Vref, and produces voltage commands signal Vea.3rd adjuster 102 is the output and the voltage circuit compensator 100 that are coupled to power converter 2,3rd adjuster 102 is the intensity of the output signal Vout in order to Modulating Power transducer 2, in this embodiment, 3rd adjuster 102 is output signal Vout of zoom in/out power converter 2, and the output signal Vout after adjustment is sent to voltage circuit compensator 100.
Commutation circuit 14 of the present invention can be the second comparator, it couples computing circuit 12 and power converter 2, and the control signal Ic of comparison operation circuit 12 output and the second reference signal Ipwm, and produce switching signal, with diverter switch Q, and reach the correction of the power factor of power converter 2.
From the above, be multiplied by signal B because multiplication signal Iref equals voltage commands signal Vea, the first reference signal Isen equals current sense signal I adjustment rear and is multiplied by signal C
2and current sense signal I equals the input current Iin of power converter 2, when be system stablize time the first reference signal Isen equal multiplication signal Iref, so, the input power Pin of power converter 2 equals voltage input voltage vin and is multiplied by input current Iin, namely equals voltage input voltage vin and is multiplied by the first reference signal Isen divided by signal C
2, namely voltage input voltage vin is multiplied by signal B and voltage commands signal Vea again divided by signal C
2, again, because signal B is the voltage input voltage vin after adjustment, so what the input power Pin of power converter 2 equaled voltage input voltage vin square is multiplied by voltage commands signal Vea, then divided by signal C
2, and square signal C
2be equivalent to voltage input voltage vin, or the voltage input voltage vin of several times, therefore, namely input power Pin equals the signal Vea of several times.So, the present invention avoids by a multiplier using divider, power factor correction circuit structure is simply more easily realized, and then reaches the volume reducing power factor correction circuit, and can reduce cost.
In sum, the power factor correction circuit of power converter of the present invention is by the output signal of a feedback circuit according to power converter, produce a voltage commands signal, one voltage input signal of computing circuit received power transducer and a current sense signal and voltage commands award signal, union circuit produces a multiplication signal according to voltage input signal and voltage commands signal, and produce one first reference signal according to voltage input signal and current sense signal, afterwards, computing circuit produces a control signal according to multiplication signal and the first reference signal again, commutation circuit is according to controlling signal and one second reference signal, and produce a switching signal, in order to a switch of switchover power converter.So, the present invention avoids by multiplier using divider, makes power factor correction circuit structure simple, and then reaches the volume reducing power factor correction circuit, and can reach the object reducing cost.
In sum, be only a preferred embodiment of the present invention, not be used for limiting scope of the invention process, all equalizations of doing according to shape, structure, feature and the spirit described in the claims in the present invention scope change and modify, and all should be included in right of the present invention.
Claims (8)
1. a power factor correction circuit for power converter, is characterized in that, it couples a power converter, and in order to adjust a power factor of this power converter, this power factor correction circuit comprises:
One voltage feedback circuit, couples an output of this power converter, and according to an output signal of this power converter, produces a voltage commands signal;
One computing circuit, couple an input and this voltage feedback circuit of this power converter, and receive a voltage input signal of this power converter, one current sense signal and this voltage commands signal, this computing circuit comprises one first reference signal and produces circuit, one first multiplier and a current loop compensator, be multiplied this voltage input signal and this voltage commands signal of this first multiplier produces a multiplication signal, and this first reference signal generation circuit produces one first reference signal according to this voltage input signal and this current sense signal, this current loop compensator compares this multiplication signal and this first reference signal and produces a control signal, and
One commutation circuit, couples this computing circuit, and according to this control signal and one second reference signal, and produce a switching signal, in order to switch a switch of this power converter;
Wherein, this first reference signal produces circuit and comprises one second multiplier, and this second multiplier couples this input of this power converter, and be multiplied this voltage input signal and this current sense signal, and produce this first reference signal.
2. power factor correction circuit as claimed in claim 1, is characterized in that, wherein this first reference signal generation circuit more comprises:
One the 3rd multiplier, couples this input of this power converter, and square this voltage input signal, and this voltage input signal after transmitting square is to this second multiplier.
3. power factor correction circuit as claimed in claim 1, is characterized in that, wherein this first reference signal generation circuit more comprises:
One arithmetic element, couples this input of this power converter, and according to a corresponding table square this voltage input signal, and this voltage input signal after transmitting square is to this second multiplier.
4. power factor correction circuit as claimed in claim 1, is characterized in that, wherein this first reference signal generation circuit more comprises:
One first adjuster, in order to adjust the intensity of this voltage input signal; And
One second adjuster, in order to adjust the intensity of this current sense signal.
5. power factor correction circuit as claimed in claim 1, is characterized in that, wherein this first reference signal generation circuit more comprises:
One low pass filter, couples this input of this power converter, and filters this voltage input signal, and transmits this voltage input signal after filtering to this second multiplier.
6. power factor correction circuit as claimed in claim 1, it is characterized in that, wherein this voltage feedback circuit comprises:
One voltage circuit compensator, couples this output of this power converter, and compares this output signal and a door signal, and produces this voltage commands signal.
7. power factor correction circuit as claimed in claim 6, it is characterized in that, wherein this voltage feedback circuit more comprises:
One adjuster, couples this output of this power converter, in order to adjust the intensity of this output signal, and this output signal after adjustment is sent to this voltage circuit compensator.
8. power factor correction circuit as claimed in claim 1, it is characterized in that, wherein this commutation circuit comprises:
One current loop compensator, couples this computing circuit and this power converter, and compares this control signal and the second reference signal, and produces this switching signal.
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| CN201010299928.6A CN101951139B (en) | 2010-09-28 | 2010-09-28 | The power factor correction circuit of power converter |
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| CN201010299928.6A CN101951139B (en) | 2010-09-28 | 2010-09-28 | The power factor correction circuit of power converter |
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| CN101951139A CN101951139A (en) | 2011-01-19 |
| CN101951139B true CN101951139B (en) | 2015-09-23 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102158069A (en) * | 2011-05-03 | 2011-08-17 | 杭州矽力杰半导体技术有限公司 | Power factor correction circuit |
| JP5382552B2 (en) * | 2011-11-18 | 2014-01-08 | Ｔｄｋ株式会社 | DCDC converter and control method of DCDC converter |
| US9141118B2 (en) * | 2011-12-07 | 2015-09-22 | System General Corporation | Switching current synthesis circuit for power converter |
| CN103066851B (en) * | 2012-12-20 | 2015-04-22 | 西安电子科技大学 | Control circuit for primary side flyback type converter |
| TWI595735B (en) * | 2015-03-24 | 2017-08-11 | 立錡科技股份有限公司 | Current regulator circuit capable of reducing current ripple and method of reducing current ripple |
| EP3627162B1 (en) * | 2018-09-21 | 2023-06-07 | Maschinenfabrik Reinhausen GmbH | Analyzing an operation of a power semiconductor device |
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| US6191564B1 (en) * | 1999-11-24 | 2001-02-20 | Lucent Technologies Inc. | Power factor correcting electrical converter apparatus |
| US6388429B1 (en) * | 2000-03-09 | 2002-05-14 | Hengchun Mao | Controller for power factor corrector and method of operation thereof |
| CN101789684A (en) * | 2010-03-05 | 2010-07-28 | 于锁平 | Power factor corrector |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7313007B2 (en) * | 2006-04-20 | 2007-12-25 | Tsai-Fu Wu | Power factor correction controller |
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| US6191564B1 (en) * | 1999-11-24 | 2001-02-20 | Lucent Technologies Inc. | Power factor correcting electrical converter apparatus |
| US6388429B1 (en) * | 2000-03-09 | 2002-05-14 | Hengchun Mao | Controller for power factor corrector and method of operation thereof |
| CN101789684A (en) * | 2010-03-05 | 2010-07-28 | 于锁平 | Power factor corrector |
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