CN103840654B - The three-phase single-level full bridge power factor corrector of transformer primary sideband auxiliary link - Google Patents

The three-phase single-level full bridge power factor corrector of transformer primary sideband auxiliary link Download PDF

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CN103840654B
CN103840654B CN201410131648.2A CN201410131648A CN103840654B CN 103840654 B CN103840654 B CN 103840654B CN 201410131648 A CN201410131648 A CN 201410131648A CN 103840654 B CN103840654 B CN 103840654B
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transformer
phase
control switch
diode
electric capacity
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CN103840654A (en
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孟涛
贲洪奇
王雪松
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Harbin Institute of Technology
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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 three-phase single-level full bridge power factor corrector of transformer primary sideband auxiliary link, belongs to field of power electronics, and the present invention solves the defect that existing three-phase one pole pfc circuit well cannot take into account above-mentioned two aspect technical problems.The present invention includes three-phase input rectification circuit, phase shift bridge, transformer T, output rectification circuit, electric capacity C 5with resistance R; Also comprise passive auxiliary link, passive auxiliary link is arranged between three-phase input rectification circuit and phase shift bridge; Passive auxiliary link comprises diode D l1, diode D l2, diode D c, diode D f, electric capacity C c1, electric capacity C c2with transformer T f; Transformer T fhave and around former limit winding L 1and L 2; Vice-side winding L f; Former limit winding L 1, former limit winding L 2with vice-side winding L fbe wound on a magnetic core.

Description

The three-phase single-level full bridge power factor corrector of transformer primary sideband auxiliary link
Technical field
The present invention relates to the three-phase single-level full bridge power factor corrector of transformer primary sideband auxiliary link, belong to field of power electronics.
Background technology
The extensive use of the nonlinear loads such as power electronics brings a large amount of harmonic waves to electrical network, and " pollution " of harmonic wave to electrical network has caused people more and more to pay attention to.Power factor correction (powerfactorcorrection, PFC) technology is the effective ways that harmonic inhabitation electric current improves power consumption equipment net side power factor, is the study hotspot of field of power electronics.Different by circuit structure, PFC technology is divided into two-stage type and single-stage type two kinds: two-stage PFC to be made up of pfc circuit and DC/DC (DC-DC) converter, there is the advantages such as PFC effect and good output, but, adopt two stage power conversion to limit the raising of circuit efficiency, and make more complicated circuit structure; The function that single-stage PFC adopts stage circuit to realize PFC and DC/DC to convert simultaneously, compared with two-stage PFC, having that circuit is simple, efficiency is high, low cost and other advantages, is the important directions of PFC technical development.At present, the research of single-stage PFC technology in small-power field is comparatively extensive, in the research in high-power field relatively less, especially in high-power field the research of three-phase single-level PFC technology be still in developing stage.
High-power field application in being applicable to based on the three-phase single-level power factor adjuster of full bridge structure.This circuit is not yet used widely at present and is mainly contained following two reasons: (1) exists leakage inductance due to the former limit of high frequency transformer, power switch switches in state can bear very large due to voltage spikes instantaneously, this due to voltage spikes adds the voltage stress of switching tube, reduces the reliability of circuit; (2) during starting circuit, output filter capacitor voltage is zero, and boost inductance, because producing very large overcurrent to filter capacitor charging, is easy to cause the saturated of inductance even to damage.At present, these two aspects problem has some corresponding solutions.But, what existing various method had adds device more or less, what have adds special control circuit, and a kind of method can only solve an above-mentioned problem usually, if all problems will be solved simultaneously, the complexity of whole Circuits System even can exceed two-stage pfc circuit, has completely lost the advantage of single-stage PFC technology.
Summary of the invention
The present invention seeks to the defect well cannot taking into account above-mentioned two aspect technical problems in order to solve existing three-phase one pole pfc circuit, providing a kind of three-phase single-level full bridge power factor corrector of transformer primary sideband auxiliary link.
The three-phase single-level full bridge power factor corrector of transformer primary sideband auxiliary link of the present invention, it comprises three-phase input rectification circuit, phase shift bridge, transformer T, output rectification circuit, electric capacity C 5with resistance R;
The cathode output end of three-phase input rectification circuit is connected with the electrode input end of phase shift bridge; The cathode output end of three-phase input rectification circuit is connected with the negative input of phase shift bridge;
The ac output end of phase shift bridge is connected with the winding two ends, former limit of transformer T, and the vice-side winding two ends of transformer T are connected with the input of output rectification circuit, and the output of output rectification circuit is parallel with electric capacity C simultaneously 5with resistance R;
Phase shift bridge is for entirely to control switch S 1, entirely control switch S 2, entirely control switch S 3entirely control switch S 4the single-phase full bridge structure inverter circuit formed;
Also comprise passive auxiliary link, passive auxiliary link is arranged between three-phase input rectification circuit and phase shift bridge;
Passive auxiliary link comprises diode D l1, diode D l2, diode D c, diode D f, electric capacity C c1, electric capacity C c2with transformer T f; Transformer T fhave and around former limit winding L 1and L 2; Vice-side winding L f; Transformer T fformer vice-side winding turn ratio be n f; Former limit winding L 1, former limit winding L 2with vice-side winding L fbe wound on a magnetic core;
Diode D l1negative electrode and electric capacity C c2one end connect the cathode output end of three-phase input rectification circuit and the electrode input end of phase shift bridge simultaneously;
Diode D l1anode and transformer T fformer limit winding L 1different name end be connected, transformer T fformer limit winding L 1same Name of Ends simultaneously with diode D cnegative electrode and electric capacity C c1one end be connected; Diode D canode simultaneously with electric capacity C c2the other end and transformer T fformer limit winding L 2different name end be connected; Transformer T fformer limit winding L 2same Name of Ends and diode D l2negative electrode be connected;
Diode D l2anode and electric capacity C c1the other end connect the cathode output end of three-phase input rectification circuit and the negative input of phase shift bridge simultaneously;
Transformer T fvice-side winding L fsame Name of Ends and the negative pole end simultaneously ground connection of output rectification circuit;
Transformer T fvice-side winding L fdifferent name end connect diode D fanode, diode D fnegative electrode connect the cathode output end of output rectification circuit.
Advantage of the present invention: a kind of three-phase single-level full bridge power factor corrector with passive auxiliary energy transform part of invention.This circuit working is in interrupted (DCM) state of boost inductor current, and input current peak value, from motion tracking input voltage, realizes power factor emendation function.The employing of the passive auxiliary energy transform part in the former limit of this circuit transformer, not only achieves the voltage suppression of this circuit but also completes circuit normal starting.
Accompanying drawing explanation
Fig. 1 is the structural representation of the three-phase single-level full bridge power factor corrector of transformer primary sideband auxiliary link of the present invention;
Fig. 2 is the structural representation of the transformer in passive auxiliary link;
Fig. 3 is the working timing figure of circuit working each switch when stable state;
Fig. 4 is when being operated in voltage stabilizing, the equivalent circuit diagram in stage 1 in a charging-discharging cycle of boost inductance;
Fig. 5 is when being operated in voltage stabilizing, the equivalent circuit diagram in stage 2 in a charging-discharging cycle of boost inductance; Also be in starting circuit process, the equivalent circuit diagram in stage 1 in boost inductance charging-discharging cycle;
Fig. 6 is when being operated in voltage stabilizing, the equivalent circuit diagram in stage 3 in a charging-discharging cycle of boost inductance;
The working timing figure of each switch when Fig. 7 is starting circuit;
Fig. 8 is operated in starting circuit process, the equivalent circuit diagram in stage 2 in a charging-discharging cycle of boost inductance;
Fig. 9 is input voltage u aoscillogram;
Figure 10 flows through boost inductance L acurrent i laoscillogram;
Figure 11 is transformer T original edge voltage U when not being with passive auxiliary link koscillogram;
Transformer T original edge voltage U when Figure 12 is band passive auxiliary link koscillogram;
Figure 13 is output voltage U in starting circuit process ooscillogram.
Embodiment
Embodiment one: present embodiment is described below in conjunction with Fig. 1 to Figure 13, the three-phase single-level full bridge power factor corrector of transformer primary sideband auxiliary link described in present embodiment, it comprises three-phase input rectification circuit 1, phase shift bridge 3, transformer T, output rectification circuit 4, electric capacity C 5with resistance R;
The cathode output end of three-phase input rectification circuit 1 is connected with the electrode input end of phase shift bridge 3; The cathode output end of three-phase input rectification circuit 1 is connected with the negative input of phase shift bridge 3;
The ac output end of phase shift bridge 3 is connected with the winding two ends, former limit of transformer T, and the vice-side winding two ends of transformer T are connected with the input of output rectification circuit 4, and the output of output rectification circuit 4 is parallel with electric capacity C simultaneously 5with resistance R;
Phase shift bridge 3 is for entirely to control switch S 1, entirely control switch S 2, entirely control switch S 3entirely control switch S 4the single-phase full bridge structure inverter circuit formed;
Also comprise passive auxiliary link 2, passive auxiliary link 2 is arranged between three-phase input rectification circuit 1 and phase shift bridge 3;
Passive auxiliary link 2 comprises diode D l1, diode D l2, diode D c, diode D f, electric capacity C c1, electric capacity C c2with transformer T f; Transformer T fhave and around former limit winding L 1and L 2; Vice-side winding L f; Transformer T fformer vice-side winding turn ratio be n f; Former limit winding L 1, former limit winding L 2with vice-side winding L fbe wound on a magnetic core;
Diode D l1negative electrode and electric capacity C c2one end connect the cathode output end of three-phase input rectification circuit 1 and the electrode input end of phase shift bridge 3 simultaneously;
Diode D l1anode and transformer T fformer limit winding L 1different name end be connected, transformer T fformer limit winding L 1same Name of Ends simultaneously with diode D cnegative electrode and electric capacity C c1one end be connected; Diode D canode simultaneously with electric capacity C c2the other end and transformer T fformer limit winding L 2different name end be connected; Transformer T fformer limit winding L 2same Name of Ends and diode D l2negative electrode be connected;
Diode D l2anode and electric capacity C c1the other end connect the cathode output end of three-phase input rectification circuit 1 and the negative input of phase shift bridge 3 simultaneously;
Transformer T fvice-side winding L fsame Name of Ends and the negative pole end simultaneously ground connection of output rectification circuit 4;
Transformer T fvice-side winding L fdifferent name end connect diode D fanode, diode D fnegative electrode connect the cathode output end of output rectification circuit 4.
Electric capacity C c1capacitance and electric capacity C c2capacitance equal.
Output rectification circuit 4 is the rectification circuits being made up of single-phase full bridge structure four diodes.
Principle for convenience of explanation, provides the equivalent leakage inductance L on the former limit of transformer T in Fig. 1 1k, the former vice-side winding turn ratio of transformer T is n.
Transformer T in passive auxiliary link 2 fstructure as shown in Figure 2, two former limit windings and a vice-side winding are wound on same magnetic core, transformer T fformer limit winding L 1with former limit winding L 2inductance value equal.
Circuit working of the present invention, in discontinous mode (DCM), wherein, controls switch S entirely 1with entirely control switch S 3conducting state complementary, entirely control switch S 2with entirely control switch S 4conducting state complementary, entirely control switch S 1, entirely control switch S 2, entirely control switch S 3entirely control switch S 4conduction ratio be all fixed on 50%, and entirely control switch S 1, entirely control switch S 3to entirely controlling switch S 2, entirely control switch S 4conduction phase be controlled.Utilize brachium pontis Switch Cut-through (S 1, S 2conducting or S 3, S 4conducting) realize the charging of boost inductance, utilize brachium pontis Switch Controller arm conducting (S 1, S 4conducting or S 2, S 3conducting) realize the transmission to load of the electric discharge of boost inductance and energy.Circuit period property ground repeats said process, makes the peak value of the electric current in boost inductance and input current (envelope) follow the tracks of the change of input ac voltage, realizes the function of power factor calibration.
Operation principle:
12 different time periods (every period is π/6) are had within the primitive period of three-phase input voltage.According to symmetry principle, in section, extended to the analysis that converter carries out the whole primitive period at any time.For 0≤ω t≤π/6 time period, each working stage of circuit in boost inductance charging-discharging cycle is introduced below, the three-phase voltage inputted in this time period: u b≤ 0≤u a≤ u c.For the ease of analyzing, make following hypothesis: in (1) circuit, each components and parts are desirable components and parts; (2) output filter capacitor C 5and electric capacity C in auxiliary link c1, C c2enough large, in a charging-discharging cycle of boost inductance, think output dc voltage U oand electric capacity C c1, C c2both end voltage keeps constant; (3) in circuit, the discharge and recharge frequency of boost inductance is far above mains frequency, and in a charging-discharging cycle, input voltage remains unchanged substantially.
Illustrate that pfc circuit is operated in the course of work of stable state and starting in a charging-discharging cycle of boost inductance below respectively.
Pfc circuit is operated in the course of work of stable state: during stable state, and the work schedule of each switch of this circuit as shown in Figure 3.In a charging-discharging cycle of boost inductance, circuit has 3 basic working stages, and the equivalent electric circuit in each stage as shown in Figures 4 to 6.
Stage 1 (boost inductor current interrupted stage), as shown in Figure 4: this stage controls switch S entirely 2, S 3conducting, S 1, S 4turn off, boost inductor current is zero, and transformer T former and deputy limit electric current is zero, transformer T in passive auxiliary link 2 fformer and deputy limit electric current be zero, the original edge voltage U of transformer T k=nU o, each switching voltage U c1=U c4=nU o, U c2=U c3=0, capacitance voltage U in passive auxiliary link 2 cc1=U cc2=nU o/ 2.In this stage, output current is only discharged by output filter capacitor to be provided.
Stage 2, (boost inductance charged, transformer T fthe excitation stage), as shown in Figure 5: this stage controls switch S entirely 1, S 2conducting, S 3, S 4turn off.Three-phase input voltage is directly added in boost inductance two ends and charges to it, and boost inductor current is linear by zero to rise.In passive auxiliary link 2, electric capacity C c1, C c2respectively to transformer T fformer limit equivalent inductance L 1, L 2charging, inductance L 1, L 2electric current is linear by zero to rise.Each switching voltage U in this stage c1=U c2=U c3=U c4=0, output current is only discharged by output filter capacitor to be provided.
Stage 3 (pfc circuit and auxiliary link are simultaneously to load transfer energized state), as shown in Figure 6: this stage controls switch S entirely 1, S 4conducting, S 2, S 3turn off.Three-phase input voltage and boost inductance pass through the full control switch S of conducting 1, S 4and transformer T is to load R transferring energy, boost inductor current starts to decline.In passive auxiliary link 2, transformer T fformer limit equivalent inductance L is stored in the stage 2 1, L 2in energy trasfer to secondary inductance L fon, inductance L felectric current decline gradually, and then be transferred to load R.In this stage, current i la(inductance L aelectric current), i lf(inductance L felectric current), i lbwith i lc(inductance L b, L celectric current) drop to zero successively.
In the stage 3, work as current i la, i lf, i lb, i lcall drop to after zero, pfc circuit enters next boost inductance charging-discharging cycle, entirely controls switch S compared with this charging-discharging cycle each stage 1, S 3on off state exchange, S 2, S 4on off state exchange.
Course of work during starting circuit: in starting process, the work schedule of each switch of this circuit as shown in Figure 7.In a charging-discharging cycle of boost inductance, circuit has 2 basic working stages.
Stage 1, (boost inductance charged, transformer T fthe excitation stage): this stage equivalent electric circuit is identical with steady-state process 2, as shown in Figure 5.This stage S 1, S 2conducting, S 3, S 4turn off.Three-phase input voltage is directly added in boost inductance two ends and charges to it, and boost inductor current is linear by zero to rise.In passive auxiliary link 2, electric capacity C c1, C c2respectively to equivalent inductance L 1, L 2charging, inductance L 1, L 2electric current is linear by zero to rise.Each switching voltage U in this stage c1=U c2=U c3=U c4=0, output current is only discharged by output filter capacitor to be provided.
Stage 2 (auxiliary link is to the output filter capacitor charging stage): this stage equivalent electric circuit as shown in Figure 8.This stage controls switch S entirely 1~ S 4whole shutoff, electric capacity C c1, C c2boosted inductive current charging, current i l1=i l2=0, transformer T fenergy by its secondary inductance L fbeing transferred to outlet side, is output filter capacitor charging.In this stage, current i la, i lf, i lb, i lcdrop to zero successively.
In the stage 2, work as current i la, i lf, i lb, i lcall drop to after zero, pfc circuit enters next boost inductance charging-discharging cycle, entirely controls switch S compared with this charging-discharging cycle each stage 1, S 3on off state exchange, S 2, S 4on off state exchange.
Fig. 9 and Figure 10 is circuit input voltage and current waveform, can find out that the peak value of input current is directly proportional to input voltage, and the envelope of input current waveform is sinusoidal wave.
Figure 11 and Figure 12 is carried before and after passive auxiliary link 2 by adopting present embodiment, three-phase single-level full-bridge pfc circuit primary voltage of transformer comparison of wave shape, damage to prevent circuit because overvoltage, Figure 11 result obtains under the condition that voltage is relatively low, and the size contrasting two waveform voltage spikes can find out that the primary voltage of transformer spike of pfc circuit obtains effective suppression.
When Figure 13 is pfc circuit starting, the waveform of output voltage, can find out that pfc circuit achieves normal starting.
Embodiment two: present embodiment is described further execution mode one, the three-phase alternating current input of three-phase input rectification circuit 1 is by boost inductance L a, L band L caccess three-phase alternating voltage u a, u band u c; Boost inductance L a, L band L cinductance value equal.
Three-phase input rectification circuit 1 forms the rectification circuit of three phase full bridge structure by six diodes.
Embodiment three: present embodiment is described further execution mode one, each boost inductance seals in a precharge current-limiting resistance R i, each precharge current-limiting resistance R itwo ends paralleling switch K.
R ifor electric capacity C c1with electric capacity C c2precharge current-limiting resistance.
Embodiment four: present embodiment is described further execution mode one, entirely controls switch S 1, entirely control switch S 2, entirely control switch S 3entirely control switch S 4adopt MOSFET or IGBT electronic power switch device; Each full control switch ends doublet diode and electric capacity.
Diode D 1with electric capacity C 1for entirely controlling switch S 1parasitic components, wherein diode D 1reverse parallel connection;
Diode D 2with electric capacity C 2for entirely controlling switch S 2parasitic components, wherein diode D 2reverse parallel connection;
Diode D 3with electric capacity C 3for entirely controlling switch S 3parasitic components, wherein diode D 3reverse parallel connection;
Diode D 4with electric capacity C 4for entirely controlling switch S 4parasitic components, wherein diode D 4reverse parallel connection.

Claims (7)

1. the three-phase single-level full bridge power factor corrector of transformer primary sideband auxiliary link, it comprises three-phase input rectification circuit (1), phase shift bridge (3), transformer T, output rectification circuit (4), electric capacity C 5with resistance R;
The cathode output end of three-phase input rectification circuit (1) is connected with the electrode input end of phase shift bridge (3); The cathode output end of three-phase input rectification circuit (1) is connected with the negative input of phase shift bridge (3);
The ac output end of phase shift bridge (3) is connected with the winding two ends, former limit of transformer T, and the vice-side winding two ends of transformer T are connected with the input of output rectification circuit (4), and the output of output rectification circuit (4) is parallel with electric capacity C simultaneously 5with resistance R,
Phase shift bridge (3) is for entirely to control switch S 1, entirely control switch S 2, entirely control switch S 3entirely control switch S 4the single-phase full bridge structure inverter circuit formed,
It is characterized in that, also comprise passive auxiliary link (2), passive auxiliary link (2) is arranged between three-phase input rectification circuit (1) and phase shift bridge (3);
Passive auxiliary link (2) comprises diode D l1, diode D l2, diode D c, diode D f, electric capacity C c1, electric capacity C c2with transformer T f; Transformer T fhave and around former limit winding L 1and L 2; Vice-side winding L f; Transformer T fformer vice-side winding turn ratio be n f; Former limit winding L 1, former limit winding L 2with vice-side winding L fbe wound on a magnetic core;
Diode D l1negative electrode and electric capacity C c2one end connect the cathode output end of three-phase input rectification circuit (1) and the electrode input end of phase shift bridge (3) simultaneously;
Diode D l1anode and transformer T fformer limit winding L 1different name end be connected, transformer T fformer limit winding L 1same Name of Ends simultaneously with diode D cnegative electrode and electric capacity C c1one end be connected; Diode D canode simultaneously with electric capacity C c2the other end and transformer T fformer limit winding L 2different name end be connected; Transformer T fformer limit winding L 2same Name of Ends and diode D l2negative electrode be connected;
Diode D l2anode and electric capacity C c1the other end connect the cathode output end of three-phase input rectification circuit (1) and the negative input of phase shift bridge (3) simultaneously;
Transformer T fvice-side winding L fsame Name of Ends and the negative pole end simultaneously ground connection of output rectification circuit (4);
Transformer T fvice-side winding L fdifferent name end connect diode D fanode, diode D fnegative electrode connect output rectification circuit (4) cathode output end.
2. the three-phase single-level full bridge power factor corrector of transformer primary sideband auxiliary link according to claim 1, is characterized in that, the three-phase alternating current input of three-phase input rectification circuit (1) is by boost inductance L a, L band L caccess three-phase alternating voltage u a, u band u c; Boost inductance L a, L band L cinductance value equal.
3. the three-phase single-level full bridge power factor corrector of transformer primary sideband auxiliary link according to claim 2, it is characterized in that, each boost inductance seals in a precharge current-limiting resistance R i, each precharge current-limiting resistance R itwo ends paralleling switch K.
4. the three-phase single-level full bridge power factor corrector of transformer primary sideband auxiliary link according to claim 1, is characterized in that, entirely control switch S 1, entirely control switch S 2, entirely control switch S 3entirely control switch S 4adopt MOSFET or IGBT electronic power switch device; Each full control switch ends doublet diode and electric capacity.
5. the three-phase single-level full bridge power factor corrector of transformer primary sideband auxiliary link according to claim 1, is characterized in that, transformer T fformer limit winding L 1with former limit winding L 2inductance value equal.
6. the three-phase single-level full bridge power factor corrector of transformer primary sideband auxiliary link according to claim 1, is characterized in that, electric capacity C c1capacitance and electric capacity C c2capacitance equal.
7. the three-phase single-level full bridge power factor corrector of transformer primary sideband auxiliary link according to claim 1, is characterized in that, entirely control switch S 1with entirely control switch S 3conducting state complementary, entirely control switch S 2with entirely control switch S 4conducting state complementary, entirely control switch S 1, entirely control switch S 2, entirely control switch S 3entirely control switch S 4conduction ratio be all fixed on 50%, and entirely control switch S 1, entirely control switch S 3to entirely controlling switch S 2, entirely control switch S 4conduction phase be controlled.
CN201410131648.2A 2014-04-02 2014-04-02 The three-phase single-level full bridge power factor corrector of transformer primary sideband auxiliary link Expired - Fee Related CN103840654B (en)

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CN107979277A (en) * 2016-10-21 2018-05-01 南京理工大学 A kind of power factor correcting based on novel transformer and inductor

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