CN103840654A - Three-phase single-stage full-bridge power factor corrector of transformer primary sideband auxiliary link - Google Patents

Three-phase single-stage full-bridge power factor corrector of transformer primary sideband auxiliary link Download PDF

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CN103840654A
CN103840654A CN201410131648.2A CN201410131648A CN103840654A CN 103840654 A CN103840654 A CN 103840654A CN 201410131648 A CN201410131648 A CN 201410131648A CN 103840654 A CN103840654 A CN 103840654A
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transformer
phase
control switch
diode
capacitor
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CN103840654B (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 invention discloses a three-phase single-stage full-bridge power factor corrector of a transformer primary sideband auxiliary link and belongs to the field of power electronics. The shortcoming that an existing three-phase single-stage PFC circuit cannot well integrate the two sides is overcome. The three-phase single-stage full-bridge power factor corrector comprises a three-phase input rectifying circuit, a phase shifting bridge, a transformer T, an output rectifying circuit, a capacitor C5, a resistor R and a passive auxiliary link. The passive auxiliary link is placed between the three-phase input rectifying circuit and the phase shifting bridge. The passive auxiliary link comprises a diode DL1, a diode DL2, a diode DC, a diode Df, a capacitor CC1, a capacitor CC2 and a transformer Tf. The transformer Tf is provided with primary side windings L1 and L2 which are wound in parallel and an auxiliary winding Lf. The primary side windings L1 and L2 and the auxiliary winding Lf are 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 three-phase single-level full bridge power factor corrector that the present invention relates to transformer primary sideband auxiliary link, belongs to field of power electronics.
Background technology
The extensive use of the nonlinear loads such as power electronics has brought a large amount of harmonic waves to electrical network, and harmonic wave has caused that to " pollution " of electrical network people more and more pay attention to.Power factor correction (power factor correction, PFC) technology is to suppress the effective ways of harmonic current raising power consumption equipment net side power factor, is the study hotspot of field of power electronics.Press circuit structure difference, PFC technology is divided into two kinds, two-stage type and single-stage type: two-stage PFC is made up of pfc circuit and DC/DC (DC-DC) converter, there is the advantages such as PFC effect and good output, but, the raising of circuit efficiency that adopted two stage power Transform Limited, and make circuit structure complicated; Single-stage PFC adopts one-level circuit to realize the function that PFC and DC/DC convert simultaneously, compared with two-stage PFC, has that circuit is simple, efficiency is high, low cost and other advantages, is the important directions of PFC technical development.At present, single-stage PFC technology is comparatively extensive in the research in small-power field, in the research in high-power field relatively less, especially in high-power field the research of three-phase single-level PFC technology still in developing stage.
Three-phase single-level power factor adjuster based on full bridge structure is the application of high-power field in being applicable to.This circuit is not yet used widely at present and is mainly contained following two reasons: (1) is because the former limit of high frequency transformer exists leakage inductance, power switch can bear very large due to voltage spikes in state switching moment, this due to voltage spikes has increased the voltage stress of switching tube, has reduced the reliability of circuit; (2) when starting circuit, output filter capacitor voltage is zero, and boost inductance, because charging produces very large overcurrent to filter capacitor, is easy to cause the saturated even damage of inductance.At present, this two aspects problem has some corresponding solutions.But, what existing the whole bag of tricks had has increased device more or less, some increases special control circuit, and a kind of method can only solve an above-mentioned problem conventionally, if solve all problems 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 cannot well take into account in order to solve existing three-phase one pole pfc circuit the defect of above-mentioned two aspect technical problems, a kind of three-phase single-level full bridge power factor corrector of transformer primary sideband auxiliary link is provided.
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, capacitor C 5and 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 secondary 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 capacitor C simultaneously 5and resistance R,
Phase shift bridge is full control switch S 1, entirely control switch S 2, entirely control switch S 3with full control switch S 4the single-phase full bridge structure inverter circuit forming,
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, capacitor C c1, capacitor C c2with transformer T f; Transformer T fhave and around former limit winding L 1and L 2; Secondary winding L f; Transformer T fformer secondary umber of turn than being n f; Former limit winding L 1, former limit winding L 2with secondary winding L fbe wound on a magnetic core;
Diode D l1negative electrode and capacitor 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 and diode D cnegative electrode and capacitor C c1one end be connected; Diode D canode simultaneously and capacitor 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 capacitor 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 fsecondary winding L fsame Name of Ends and the negative pole end of output rectification circuit ground connection simultaneously;
Transformer T fsecondary 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: this patent has been invented a kind of three-phase single-level full bridge power factor corrector with passive auxiliary energy transform part.This circuit working is in boost inductance discontinuous current (DCM) state, and input current peak value, from motion tracking input voltage, is realized power factor emendation function.The employing of the passive auxiliary energy transform part in the former limit of this circuit transformer, has not only realized the voltage inhibition of this circuit but also has completed circuit normal starting.
Brief description of the drawings
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 in the time of stable state;
Fig. 4 is while being operated in voltage stabilizing, and of boost inductance discharges and recharges the equivalent circuit diagram in stage 1 in the cycle;
Fig. 5 is while being operated in voltage stabilizing, and of boost inductance discharges and recharges the equivalent circuit diagram in stage 2 in the cycle; Also be in starting circuit process, one of boost inductance discharges and recharges the equivalent circuit diagram in stage 1 in the cycle;
Fig. 6 is while being operated in voltage stabilizing, and of boost inductance discharges and recharges the equivalent circuit diagram in stage 3 in the cycle;
The working timing figure of each switch when Fig. 7 is starting circuit;
Fig. 8 is operated in starting circuit process, and of boost inductance discharges and recharges the equivalent circuit diagram in stage 2 in the cycle;
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 while not being with passive auxiliary link koscillogram;
Figure 12 is transformer T original edge voltage U while being with 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, capacitor C 5and 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 secondary 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 capacitor C simultaneously 5and resistance R,
Phase shift bridge 3 is full control switch S 1, entirely control switch S 2, entirely control switch S 3with full control switch S 4the single-phase full bridge structure inverter circuit forming,
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, capacitor C c1, capacitor C c2with transformer T f; Transformer T fhave and around former limit winding L 1and L 2; Secondary winding L f; Transformer T fformer secondary umber of turn than being n f; Former limit winding L 1, former limit winding L 2with secondary winding L fbe wound on a magnetic core;
Diode D l1negative electrode and capacitor 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 and diode D cnegative electrode and capacitor C c1one end be connected; Diode D canode simultaneously and capacitor 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 capacitor 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 fsecondary winding L fsame Name of Ends and the negative pole end of output rectification circuit 4 ground connection simultaneously;
Transformer T fsecondary winding L fdifferent name end connect diode D fanode, diode D fnegative electrode connect the cathode output end of output rectification circuit 4.
Capacitor C c1capacitance and capacitor C c2capacitance equate.
Output rectification circuit 4 is the rectification circuits that are 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 secondary umber of turn of transformer T is than being n.
Transformer T in passive auxiliary link 2 fstructure as shown in Figure 2, two former limit windings and a secondary winding technique on same magnetic core, transformer T fformer limit winding L 1with former limit winding L 2inductance value equate.
Circuit working of the present invention, in discontinous mode (DCM), wherein, is controlled switch S entirely 1with full control switch S 3conducting state complementation, entirely control switch S 2with full control switch S 4conducting state complementation, entirely control switch S 1, entirely control switch S 2, entirely control switch S 3with full control switch S 4conduction ratio be all fixed on 50%, and entirely control switch S 1, entirely control switch S 3to full control switch S 2, entirely control switch S 4conducting phase place 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 to 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, and making the electric current in boost inductance is the variation of peak value (envelope) the tracking input ac voltage of input current, realizes the function of power factor calibration.
Operation principle:
Within the primitive period of three-phase input voltage, have 12 different time periods (every period is π/6).According to symmetry principle, the analysis of in section, converter being carried out at any time can expand to the whole primitive period.Discharge and recharge each working stage of circuit in the cycle as an example of 0≤ω t≤π/6 time period example to one of boost inductance below and be introduced, the three-phase voltage of inputting 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 capacitor C in auxiliary link c1, C c2enough large, discharge and recharge and in the cycle, think output dc voltage U of boost inductance oand capacitor C c1, C c2it is constant that both end voltage keeps; (3) in circuit boost inductance discharge and recharge frequency far above mains frequency, discharge and recharge in the cycle at one, input voltage remains unchanged substantially.
Illustrate respectively that one at boost inductance discharged and recharged in the cycle below, pfc circuit is operated in the course of work of stable state and starting.
Pfc circuit is operated in the course of work of stable state: when stable state, the work schedule of the each switch of this circuit as shown in Figure 3.One at boost inductance discharged and recharged in the cycle, and circuit has 3 basic working stages, and the equivalent electric circuit in each stage as shown in Figures 4 to 6.
Stage 1 (boost inductance discontinuous current stage), as shown in Figure 4: full control of this stage switch S 2, S 3conducting, S 1, S 4turn-off, boost inductance electric current is zero, and the former and deputy limit of transformer T 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 provided by output filter capacitor electric discharge.
Stage 2, (boost inductance charged, transformer T fthe excitation stage), as shown in Figure 5: full control of this stage switch S 1, S 2conducting, S 3, S 4turn-off.Three-phase input voltage is directly added in boost inductance two ends it is charged, and boost inductance electric current rises by zero beginning is linear.In passive auxiliary link 2, capacitor C c1, C c2respectively to transformer T fformer limit equivalent inductance L 1, L 2charging, inductance L 1, L 2electric current rises by zero beginning is linear.Each switching voltage U in this stage c1=U c2=U c3=U c4=0, output current is only provided by output filter capacitor electric discharge.
Stage 3 (pfc circuit and auxiliary link are simultaneously to the load transfer energy stage), as shown in Figure 6: full control of this stage switch S 1, S 4conducting, S 2, S 3turn-off.Three-phase input voltage and boost inductance are by the full control switch S of conducting 1, S 4and transformer T is to load R transferring energy, boost inductance electric current starts to decline.In passive auxiliary link 2, transformer T fin the stage 2, be stored in former limit equivalent inductance L 1, L 2in energy be transferred to secondary inductance L fupper, 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 successively zero.
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 and discharges and recharges the cycle, full control switch S compared with each stage in the cycle that originally discharges and recharges 1, S 3on off state exchange, S 2, S 4on off state exchange.
Course of work when starting circuit: in starting process, the work schedule of the each switch of this circuit as shown in Figure 7.One at boost inductance discharged and recharged in the cycle, and 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 it is charged, and boost inductance electric current rises by zero beginning is linear.In passive auxiliary link 2, capacitor C c1, C c2respectively to equivalent inductance L 1, L 2charging, inductance L 1, L 2electric current rises by zero beginning is linear.Each switching voltage U in this stage c1=U c2=U c3=U c4=0, output current is only provided by output filter capacitor electric discharge.
Stage 2 (auxiliary link is to the output filter capacitor charging stage): this stage equivalent electric circuit as shown in Figure 8.Full control of this stage switch S 1～S 4all turn-off capacitor 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 successively zero.
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 and discharges and recharges the cycle, full control switch S compared with each stage in the cycle that originally discharges and recharges 1, S 3on off state exchange, S 2, S 4on off state exchange.
Fig. 9 and Figure 10 are 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 are by adopting present embodiment to be carried passive auxiliary link 2 front and back, the contrast of three-phase single-level full-bridge pfc circuit transformer primary side voltage waveform, damage in order to prevent circuit because overvoltage, Figure 11 result is to obtain under the relatively low condition of voltage, and the size of contrast two waveform voltage spikes can find out that the transformer primary side due to voltage spikes of pfc circuit has obtained effective inhibition.
Figure 13 is the waveform of pfc circuit when starting output voltage, can find out that pfc circuit realized 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 equate.
Three-phase input rectification circuit 1 is made up of the rectification circuit of three phase full bridge structure 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 capacitor C c1and capacitor C c2precharge current-limiting resistance.
Embodiment four: present embodiment is described further execution mode one, controls switch S entirely 1, entirely control switch S 2, entirely control switch S 3with full control switch S 4adopt MOSFET or IGBT electronic power switch device; Each full control switch ends doublet diode and electric capacity.
Diode D 1and capacitor C 1for full control switch S 1parasitic components, wherein diode D 1reverse parallel connection;
Diode D 2and capacitor C 2for full control switch S 2parasitic components, wherein diode D 2reverse parallel connection;
Diode D 3and capacitor C 3for full control switch S 3parasitic components, wherein diode D 3reverse parallel connection;
Diode D 4and capacitor C 4for full control 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), capacitor C 5and 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 secondary 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 capacitor C simultaneously 5and resistance R,
Phase shift bridge (3) is full control switch S 1, entirely control switch S 2, entirely control switch S 3with full control switch S 4the single-phase full bridge structure inverter circuit forming,
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, capacitor C c1, capacitor C c2with transformer T f; Transformer T fhave and around former limit winding L 1and L 2; Secondary winding L f; Transformer T fformer secondary umber of turn than being n f; Former limit winding L 1, former limit winding L 2with secondary winding L fbe wound on a magnetic core;
Diode D l1negative electrode and capacitor 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 and diode D cnegative electrode and capacitor C c1one end be connected; Diode D canode simultaneously and capacitor 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 capacitor 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 fsecondary winding L fsame Name of Ends and the negative pole end of output rectification circuit (4) ground connection simultaneously;
Transformer T fsecondary 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 equate.
3. the three-phase single-level full bridge power factor corrector of transformer primary sideband auxiliary link according to claim 2, 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 controls switch S 1, entirely control switch S 2, entirely control switch S 3with full 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 equate.
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 capacitor C c1capacitance and capacitor C c2capacitance equate.
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 controls switch S 1with full control switch S 3conducting state complementation, entirely control switch S 2with full control switch S 4conducting state complementation, entirely control switch S 1, entirely control switch S 2, entirely control switch S 3with full control switch S 4conduction ratio be all fixed on 50%, and entirely control switch S 1, entirely control switch S 3to full control switch S 2, entirely control switch S 4conducting phase place 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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