CN102710117B - High-efficiency passive power factor correction circuit - Google Patents

High-efficiency passive power factor correction circuit Download PDF

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Publication number
CN102710117B
CN102710117B CN201210195497.8A CN201210195497A CN102710117B CN 102710117 B CN102710117 B CN 102710117B CN 201210195497 A CN201210195497 A CN 201210195497A CN 102710117 B CN102710117 B CN 102710117B
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diode
power factor
circuit
negative electrode
transformer
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CN201210195497.8A
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CN102710117A (en
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杨祎巍
吴朝晖
李斌
柯志胜
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South China University of Technology SCUT
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South China University of Technology SCUT
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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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Abstract

The invention relates to a high-efficiency passive power factor correction circuit. The high-efficiency passive power factor correction circuit comprises a rectifier bridge circuit, a passive power factor correction circuit and a flyback circuit, wherein the passive power factor correction circuit is cascaded between the bridge arms of the rectifier bridge circuit and the flyback circuit; the rectifier bridge circuit comprises a first diode (D1), a second diode (D2), a third diode (D3) and a fourth diode (D4); the passive power factor correction circuit comprises a first inductor (L1), a secondary inductor (L2) of a transformer (T1), a fifth diode (D5), a first capacitor (C1) and a second capacitor (C2); and the flyback circuit comprises a metal oxide semiconductor (MOS) transistor (Q), a primary inductor (L3) of the transformer (T1), another secondary inductor (L4) of the transformer (T1), a sixth diode (D6) and a third capacitor (C3). The high-efficiency passive power factor correction circuit has low cost, small volume, simple structure and high efficiency.

Description

A kind of high-efficiency passive power factor correction circuit
Technical field
The present invention relates to the capability correction technical field in AC-DC transfer process, relate in particular to a kind of passive power factor correcting circuit.
Background technology
Power factor (PF) is defined as the ratio of active power and apparent power, as shown in (1) formula, and V wherein inrepresent input voltage, the effective value of I indicating impulse electric current, I nthe effective value that represents nth harmonic, I 1the effective value that represents fundamental current, θ is fundamental current I 1with input voltage V indiffer.
Wherein total harmonic distortion factor (Total Harmonics Distortion, THD) is defined as total effective value of higher harmonic current component and the ratio of fundamental current effective value, as shown in (2) formula.
THD = Σ n = 2 ∞ I n / I 1 - - - ( 2 ) ;
Power factor represents with relation available (3) formula of total harmonic distortion factor.When differing θ, be 0, and during THD<5%, power factor can be controlled at more than 0.99.Therefore, the raising of power factor is mainly from reducing harmonic current composition, and carry out these two aspects that differ that reduce to input fundamental current and input voltage.
PF = cos &theta; / 1 + THD 2 - - - ( 3 ) ;
In power electronic equipment, electronic instrument and household appliances, the AC network power supply of 220V is carried out to rectification and obtain DC power supply, be very extensively and the most AC-DC (AC-DC) conversion scheme on basis of a kind of application.Under normal conditions, this AC-DC conversion is realized by full bridge rectifier, after connect a large filter capacitor, to obtain the comparatively straight direct voltage source of waveform.When the current potential of input ac voltage is lower, the required electric energy of load is provided by energy storage capacitor, and alternating-current voltage source itself does not provide electric current; When the current potential of input ac voltage is higher, alternating-current voltage source directly charges to storage capacitor.Therefore, although the alternating voltage of input is sinusoidal wave, the alternating current of input is but pulse type, and wave distortion is serious.In the input current of these pulse types, contain a large amount of harmonic waves, if a large amount of current harmonics components blows back into electrical network, can make on the one hand the harmonic noise level in electrical network improve, cause the harmonic wave " pollution " of electrical network, can produce " quadratic effect " on the other hand, be that electric current flows through line impedance and forms harmonic voltage and fall, make conversely line voltage (primary sinusoid) also distort.When these effects are serious, can cause fault, damage converting equipment.
If there is no storage capacitor in parallel after rectifier bridge, and be directly to connect a pure resistive load, so obviously, the phase difference between voltage and current is zero and there is no harmonic current, power factor is 1.Therefore the essence of power factor correction (PFC) technology, will make the input of power consumption equipment present " pure resistive " to input electrical network exactly, namely will make to be directly proportional between input current and input voltage.On the other hand, from the angle of Energy Transfer, PFC technology is to make the input of power consumption equipment draw energy from input electrical network, and energy is fed back to again in input electrical network, does not go.
At present, the method that solves harmonic pollution in electric power net has two kinds: the one, in grid side, the harmonic current having produced is compensated; The 2nd, in power electronic equipment inside, passive or active pfc circuit is set, reach the object of PFC.Wherein, rear a kind of be comparatively basic solution.
Summary of the invention
The object of the present invention is to provide a kind of high-efficiency passive power factor correction circuit, this circuit is positioned between rectifier bridge and DC-to-DC (DC-DC) transducer, and for improving the power factor of circuit, concrete technical scheme is as follows.
The present invention is applicable to the circuit of power factor correction of passive high frequency, comprises three parts: rectifier circuit, Passive Power factor correction circuit and reverse excitation circuit.Described Passive Power factor correction circuits cascading is between rectifier circuit and the brachium pontis of reverse excitation circuit.
Preferably, described rectifier circuit comprises the first diode, the second diode, the 3rd diode and the 4th diode; Described passive power factor correcting circuit comprises secondary inductance, the 5th diode, the first electric capacity, second electric capacity of the first inductance, transformer; Described reverse excitation circuit comprises primary inductance, another secondary inductance of transformer, the 6th diode, the 3rd electric capacity of metal-oxide-semiconductor, transformer.
Preferably, in described rectifier circuit, each element annexation is as follows: the negative electrode of the first diode is connected with the negative electrode of the second diode, the anode of the 3rd diode is connected with the anode of the 4th diode, the negative electrode of the 3rd diode is connected with the anode of the first diode, and the negative electrode of the 4th diode is connected with the anode of the second diode; The input termination alternating voltage of described rectifier circuit, an input is connected with the anode of the first diode, the negative electrode of the 3rd diode, and another input is connected with the anode of the second diode, the negative electrode of the 4th diode; The negative electrode of the second diode is output plus terminal, and the anode of the 4th diode, for output negative terminal, is wherein exported negativing ending grounding.
Preferably, in described Passive Power factor correction circuit, each element annexation is as follows: one end of the first inductance is connected with the negative electrode of the 4th diode with the second diode, the other end of the first inductance is connected with the anode of the 5th diode, the Same Name of Ends of the secondary inductance of transformer is connected with the anode of the 5th diode, the non-same polarity of the secondary inductance of transformer is connected with one end of the first electric capacity, the other end ground connection of the first electric capacity.The negative electrode of the 5th diode is connected with one end of the second electric capacity, the other end ground connection of the second electric capacity.
Preferably, in described reverse excitation circuit, each element annexation is as follows: the Same Name of Ends of first end inductance and the drain electrode of metal-oxide-semiconductor of transformer are connected, the source ground of metal-oxide-semiconductor, the non-same polarity of the first end inductance of transformer is connected with the negative electrode of the 5th diode, the Same Name of Ends of another secondary inductance of transformer is connected with the anode of the 6th diode, the non-same polarity of another secondary inductance of transformer is connected with output negative terminal, the negative electrode of the 6th diode is connected with output plus terminal, and the two ends of the 3rd electric capacity are respectively output plus terminal and negative terminal.
Preferably, described the first diode, the second diode, the 3rd diode and the 4th diode are rectifier diode, and the 6th diode is that supper-fast recovery diode, the 5th diode are fast recovery diode.
Compared with prior art, tool of the present invention has the following advantages: passive power factor correcting circuit cost that the present invention proposes is low, volume is little, simple in structure, efficiency is high, meets the C class standard in the EN61000-3-2 of European Union.This circuit can bring up to 0.995 by power factor under optimal situation, has overcome preferably the not high shortcoming of ordinary passive circuit of power factor correction power factor.
Accompanying drawing explanation
Fig. 1 is passive power factor correcting circuit schematic diagram.
Embodiment
Below in conjunction with accompanying drawing and example, specific embodiment of the invention is described further, but enforcement of the present invention and protection are not limited to this.
As shown in Figure 1, high-efficiency passive power factor correction circuit forms and uses element as follows:
Be applicable to the circuit of power factor correction of passive high frequency, comprise three parts: rectifier circuit, circuit of power factor correction and reverse excitation circuit.Described circuit of power factor correction level is associated between rectifier circuit and the brachium pontis of reverse excitation circuit.
Described rectifier circuit comprises the first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4; Described passive power factor correcting circuit comprises secondary inductance L2, the 5th diode D5, the first capacitor C 1, the second capacitor C 2 of the first inductance L 1, transformer T1; Described reverse excitation circuit comprises primary inductance L3, another secondary inductance of transformer T1 L4, the 6th diode D6, the 3rd capacitor C 3 of metal-oxide-semiconductor Q, transformer T1.
The first diode D1 is connected with the negative electrode of the second diode D2, and the anode of the 3rd diode D3 is connected with the anode of the 4th diode D4.The negative electrode of the first diode D1 is connected with the negative electrode of the second diode D2, and the negative electrode of the 3rd diode D3 is connected with the anode of the first diode D1, and the negative electrode of the 4th diode D4 is connected with the anode of the second diode D2; The input termination alternating voltage of described rectifier circuit, input AC_L is connected with the anode of the first diode D1, the negative electrode of the 3rd diode D3, and AC_N is connected with the anode of the second diode D2, the negative electrode of the 4th diode D4; The negative electrode of the second diode D2 is output plus terminal, and the anode of the 4th diode D4, for output negative terminal, is wherein exported negativing ending grounding.
One end of the first inductance L 1 is connected with the negative electrode of the 4th diode D4 with the second diode D2, the other end of the first inductance L 1 is connected with the anode of the 5th diode D5, the Same Name of Ends of the secondary inductance L2 of transformer T1 is connected with the anode of the 5th diode D5, the non-same polarity of the secondary inductance L2 of transformer T1 is connected with one end of the first capacitor C 1, the other end ground connection of the first capacitor C 1.The negative electrode of the 5th diode D5 is connected with one end of the second capacitor C 2, the other end ground connection of the second capacitor C 2.
The Same Name of Ends of the first end inductance L 3 of transformer T1 is connected with one end of metal-oxide-semiconductor Q, the other end ground connection of metal-oxide-semiconductor Q, the non-same polarity of the first end inductance L 3 of transformer T1 is connected with the negative electrode of the 5th diode D5, the Same Name of Ends of another secondary inductance L4 of transformer T1 is connected with the anode of the 6th diode D6, the non-same polarity of another secondary inductance L4 of transformer T1 is connected with output negative terminal DC-, the negative electrode of the 6th diode D6 is connected with output plus terminal DC+, and the two ends of the 3rd capacitor C 3 are respectively the positive and negative end DC+ of output and DC-.
This circuit is PPFC (Passive Power Factor Correction), and the device of use is passive device, and whole like this circuit cost reduces greatly, and structure also wants simple a lot of compared with APFC; Owing to using fewer passive device just can obtain higher power factor, so the volume of circuit has also reduced greatly.
In the course of work, this circuit utilizes energy storage inductor L1 and capacitor C 2 to promote direct voltage and fills and leads up the lowest point part of DC ripple, make direct voltage more steady, utilize another secondary inductance L2 and the capacitor C 1 of transformer to feed back, play the effect of filling and leading up DC ripple the lowest point, by the effect of said two devices, expanded the conducting pin of rectifier diode, make the waveform of input current close to the waveform of input voltage, reduce greatly the harmonic distortion of input current, thereby improved the power factor of circuit.
In this circuit, the parameter of main components can be determined by following formula.
When switch conduction, the first inductance L 1 meets:
i L 1 = | V in | + ( N 3 N 1 ) V C 2 - V C 1 L 1 ( t 0 - t 1 ) - - - ( 1 ) ;
V wherein infor input voltage, V c1be the voltage at the first electric capacity two ends, V c2be the voltage at the second electric capacity two ends, t 0-t 1represent the switch conduction time, i l1for flowing through the electric current of the first inductance.
Primary inductance L3, a secondary inductance L4 of note transformer T1 and the number of turn of another secondary inductance L2 are respectively N1, N2, N3, between N1, N2, N3, meet:
N1i 1+ N2i 2-N3i c1=0 and i 2=0 (2);
I wherein 1represent to flow through the electric current of the 3rd inductance L 3, i 2represent to flow through the electric current of the 4th inductance L 4, i c1represent to flow through the electric current of the second inductance L 2.Between the second inductance L 2 and the 3rd inductance L 3, meet:
N1>N3 （3）；
The first capacitor C 1 and the second capacitor C 2 meet:
C2>C1 （4）；
Between the second inductance L 2 and the 3rd inductance L 3, meet:
N 1 N 3 &GreaterEqual; 2 - - - ( 5 ) ;
The 6th diode D6 is used supper-fast recovery diode for the best, and the 5th diode D5 is fast recovery diode, and diode load current value should meet circuit requirement.

Claims (4)

1. a high-efficiency passive power factor correction circuit, comprise rectifier circuit, reverse excitation circuit, it is characterized in that also comprising passive power factor correcting circuit, described passive power factor correcting circuit level is associated between rectifier circuit and the brachium pontis of reverse excitation circuit; Described rectifier circuit comprises the first diode (D1), the second diode (D2), the 3rd diode (D3) and the 4th diode (D4); Described passive power factor correcting circuit comprises secondary inductance (L2), the 5th diode (D5), the first electric capacity (C1) and second electric capacity (C2) of the first inductance (L1), transformer (T1); The negative electrode of the first diode (D1) is connected with the negative electrode of the second diode (D2), and the anode of the 3rd diode (D3) is connected with the anode of the 4th diode (D4); The negative electrode of the 3rd diode (D3) is connected with the anode of the first diode (D1), and the negative electrode of the 4th diode (D4) is connected with the anode of the second diode (D2); Two input termination alternating voltages of described rectifier circuit, one of them input (AC_L) is connected with the negative electrode of the 3rd diode (D3) with the anode of the first diode (D1), and another input (AC_N) is connected with the negative electrode of the 4th diode (D4) with the anode of the second diode (D2); The negative electrode of the second diode (D2) is output plus terminal, and the anode of the 4th diode (D4), for output negative terminal, is wherein exported negativing ending grounding; In described passive power factor correcting circuit, one end of the first inductance (L1) is connected with the negative electrode of the second diode (D2), the 4th diode (D4), the other end of the first inductance (L1) is connected with the anode of the 5th diode (D5), the Same Name of Ends of the secondary inductance (L2) of transformer (T1) is connected with the anode of the 5th diode (D5), the non-same polarity of the secondary inductance (L2) of transformer (T1) is connected with one end of the first electric capacity (C1), the other end ground connection of the first electric capacity (C1); The negative electrode of the 5th diode (D5) is connected with one end of the second electric capacity (C2), the other end ground connection of the second electric capacity (C2).
2. high-efficiency passive power factor correction circuit as claimed in claim 1, is characterized in that: described reverse excitation circuit comprises primary inductance (L3), another secondary inductance of transformer (T1) (L4), the 6th diode (D6) and the 3rd electric capacity (C3) of metal-oxide-semiconductor (Q), transformer (T1), in described reverse excitation circuit, the Same Name of Ends of the first end inductance (L3) of transformer (T1) is connected with the drain electrode of metal-oxide-semiconductor (Q), the source ground of metal-oxide-semiconductor (Q), the non-same polarity of the first end inductance (L3) of transformer (T1) is connected with the negative electrode of the 5th diode (D5), the Same Name of Ends of another secondary inductance (L4) of transformer (T1) is connected with the anode of the 6th diode (D6), the non-same polarity of another secondary inductance (L4) of transformer (T1) is connected with output negative terminal (DC-), the negative electrode of the 6th diode (D6) is connected with output plus terminal (DC+), the two ends of the 3rd electric capacity (C3) are respectively output plus terminal (DC+) and output negative terminal (DC-).
3. high-efficiency passive power factor correction circuit as claimed in claim 1, is characterized in that: first diode (D1) of described rectifier circuit, the second diode (D2), the 3rd diode (D3) and the 4th diode (D4) are rectifier diode.
4. high-efficiency passive power factor correction circuit as claimed in claim 2, is characterized in that: described the 6th diode (D6) is supper-fast recovery diode, and the 5th diode (D5) is fast recovery diode.
CN201210195497.8A 2012-06-13 2012-06-13 High-efficiency passive power factor correction circuit Expired - Fee Related CN102710117B (en)

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Publication number Priority date Publication date Assignee Title
CN103856077B (en) * 2012-12-06 2016-12-21 东林科技股份有限公司 The method of operating of the power factor correction circuit of passive type power factor correction function DC-AC conversion device
CN106849687B (en) * 2017-03-15 2019-04-26 四川长虹电器股份有限公司 Double flyback sourses of passive power factor correction are realized in two-way LC oscillation
CN112737292B (en) * 2020-12-25 2022-04-08 杭州中恒电气股份有限公司 Control method, device, equipment and medium for improving current harmonic total distortion rate

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1808868A (en) * 2005-01-19 2006-07-26 林福泳 High frequency DC power supply with high power factor
CN202872633U (en) * 2012-06-13 2013-04-10 华南理工大学 High-efficiency passive power factor correction circuit

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KR20110138068A (en) * 2010-06-18 2011-12-26 페어차일드코리아반도체 주식회사 Powerfactor compensation converter and driving method thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1808868A (en) * 2005-01-19 2006-07-26 林福泳 High frequency DC power supply with high power factor
CN202872633U (en) * 2012-06-13 2013-04-10 华南理工大学 High-efficiency passive power factor correction circuit

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