CN111934567B - Bridgeless double-Boost power factor correction rectifier for left-right alternate auxiliary commutation - Google Patents

Bridgeless double-Boost power factor correction rectifier for left-right alternate auxiliary commutation Download PDF

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CN111934567B
CN111934567B CN202010301612.XA CN202010301612A CN111934567B CN 111934567 B CN111934567 B CN 111934567B CN 202010301612 A CN202010301612 A CN 202010301612A CN 111934567 B CN111934567 B CN 111934567B
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auxiliary
time
commutation
main
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CN111934567A (en
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禹健
安永泉
郭凤琴
荆蕊蕊
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Shanxi University
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
    • H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
    • H02M7/12—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/217—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
    • H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
    • H02M7/12—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/217—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M7/219—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0048—Circuits or arrangements for reducing losses
    • H02M1/0054—Transistor switching losses
    • H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
    • 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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  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Dc-Dc Converters (AREA)

Abstract

本发明公开了一种左右交替辅助换流的无桥双Boost功率因数校正整流器，可实现主回路开关和辅助回路开关的的ZVS导通。全控型开关替代基本无桥电路的整流二极管，主回路具有两种充能态。交替工作的辅助回路实现励磁电流双向复位，因而减小了变压器磁芯体积。变压器副边绕组耦合减小了辅助换流二极管电压应力。

Figure 202010301612

The invention discloses a bridgeless double Boost power factor correction rectifier with left and right alternating auxiliary commutation, which can realize ZVS conduction of the main circuit switch and the auxiliary circuit switch. The fully controlled switch replaces the rectifier diode of the basic bridgeless circuit, and the main circuit has two charging states. The auxiliary circuit working alternately realizes the bidirectional reset of the excitation current, thus reducing the volume of the transformer core. The transformer secondary winding coupling reduces the voltage stress of the auxiliary commutator diode.

Figure 202010301612

Description

Bridgeless double-Boost power factor correction rectifier for left-right alternate auxiliary commutation
Technical Field
The invention relates to the technical field of power electronic current conversion, in particular to a bridgeless double-Boost power factor correction rectifier for left-right alternate auxiliary current conversion.
Background
Among many PFC circuits, Boost converters are widely used due to their simple structure, continuous input current, and strong uniformity of characteristics. The bridgeless Boost PFC reduces conduction loss by reducing the number of semiconductor devices on a working circuit, and achieves the purpose of improving efficiency. However, the problem of switching loss in the bridgeless PFC is prominent, and when the switching frequency is increased, the switching loss in the circuit is increased, and especially when the circuit operates in CCM, the reverse recovery current of the freewheeling diode increases the switching loss of the switching tube. In order to reduce the switching loss and dynamic switching stress and realize high switching frequency operation, the auxiliary resonant commutation ultra-soft switching topological structure does not influence the working mode of the original main loop and does not increase the switching stress, thereby gaining wide attention.
In 1990, R.De Doncker originally proposed a capacitance voltage division type auxiliary resonant pole topology, and the neutral point is gradually changed and replaced by an inductance voltage division type auxiliary resonant pole topology due to large volume. However, the inductance voltage division type auxiliary resonant pole topology has the problem of excitation current reset. The zero-voltage conversion inverter ZVT-2CI based on the double-coupling inductor realizes the unidirectional reset of the exciting current, so that the transformer core of an auxiliary circuit of the inverter is prevented from being saturated, and the DC output current condition can work. However, three types of problems exist in the ZVT-2CI inverter family: 1) the switch ZCS of the auxiliary loop is switched on, only EOSS (over-voltage-isolation) can be used, namely an IGBT (insulated gate bipolar translator) device with smaller energy storage of an equivalent output capacitor, and the conduction loss and EMI (electro-magnetic interference) cannot be ignored; 2) the excitation current is reset in a single direction, so that the size of the magnetic core of the selected transformer is large, and two sets of auxiliary loops are needed to realize the auxiliary current conversion work of the main switch under the condition of bidirectional current output; 3) the auxiliary current conversion diode has no clamping measure, and the voltage stress and EMI are caused by overcharge and ringing. 4) In high-frequency application, under the condition of small duty ratio of a main loop, the commutation preparation time is insufficient.
Disclosure of Invention
In order to solve the defects of the prior art, the bridgeless double-Boost power factor correction rectifier with left-right alternating auxiliary commutation can realize ZVS (zero voltage switching) conduction of a main loop switch and an auxiliary loop switch. The full-control switch replaces a rectifier diode of a basic bridgeless circuit, and a main loop has two energy charging states. The auxiliary loop working alternately realizes the bidirectional reset of the exciting current, thereby reducing the volume of the magnetic core of the transformer. The secondary winding coupling of the transformer reduces the voltage stress of the auxiliary converter diode.
The invention provides a bridgeless double-Boost power factor correction rectifier with left-right alternate auxiliary commutation, which comprises a first main switch tube S1A second main switch tube S2And the third main switch tube S3The fourth main switch tube S4Filter inductor Tf1Filter inductor Tf2AC power supply VACDC power supply VDCAuxiliary power supply VAUXA first commutation diode DN1A second commutation diode DN2A third commutation diode DN3And a fourth conversion diode DN4Auxiliary converter transformer primary winding T1A first winding T of the secondary side of the transformer2Auxiliary secondary side second winding T of auxiliary converter transformer3Auxiliary transformer secondary side third winding T4Auxiliary fourth winding T of auxiliary converter transformer5Resonant inductor Lr1Resonant inductor Lr2A first auxiliary switchPipe Sa1A second auxiliary switch tube Sa2The third auxiliary switch tube Sa3The fourth auxiliary switch tube Sa4An advanced bridge arm AC-Lead of the left commutation auxiliary circuit, a Lag bridge arm AC-Lag of the left commutation auxiliary circuit, and the first main switch tube S1Source electrode, second main switch tube2The drain electrode is connected with a point P to form a left bridge arm of the main switch; third main switch tube S3Source electrode and fourth main switch tube S4The drain electrode of the switch is connected with a point Q to form a main switch right bridge arm; filter inductance Tf1One end of (1) and an AC power supply VACThe other end of the L-shaped end is connected with the point P; filter inductance Tf2One end of (1) and an AC power supply VACThe other end of the N-shaped contact is connected with a point Q; first commutation diode DN1The positive pole and the first winding T of the secondary side of the transformer2Is connected with the same name terminal of the first inverting diode DN2And the secondary side second winding T of the auxiliary converter transformer3The different name ends are connected; third commutation diode DN3The anode of the transformer and a secondary side third winding T of the transformer4Is connected with the different name end of the fourth conversion diode DN4Negative pole of the auxiliary converter transformer and a secondary fourth winding T of the auxiliary converter transformer5The same name end of the terminal is connected; auxiliary side first winding T of auxiliary converter transformer2Different name end, auxiliary side second winding T of auxiliary converter transformer3Is connected to the point O1Auxiliary converter transformer secondary third winding T4The same name end of the auxiliary converter transformer and the secondary fourth winding T of the auxiliary converter transformer5Is connected to the point O2(ii) a First main switch tube S1Drain electrode of (1), third main switching tube S3The first conversion diode DN1Negative electrode of (1), third inverter diode DN3And a negative electrode of (2) and a DC power supply VDCThe positive electrodes are connected; second main switch tube S2Source electrode of (1), fourth main switching tube S4Source of (1), second conversion diode DN2Positive electrode of (1), fourth conversion diode DN4And a direct current power supply VDCThe negative electrodes are connected; resonant inductor Lr1One end of the main switch is connected with the midpoint P of the left bridge arm of the main switch, and the other end of the main switch is connected with the point O1Connecting; resonant inductor Lr2One end of the main switch is connected with a midpoint Q point of a right bridge arm of the main switch, and the other end of the main switch is connected with O2Connecting; first auxiliary switch tube Sa1Source electrode of and second auxiliary switch tube Sa2The drain electrode of the left converter auxiliary circuit is connected with the R point, and the two switching tubes form an advanced bridge arm AC-Lead of the left converter auxiliary circuit; third auxiliary switch tube Sa3Source electrode of and fourth auxiliary switch tube Sa4The drain electrode of the left converter auxiliary circuit is connected with a W point, and the two switching tubes form a hysteresis bridge arm AC-Lag of the left converter auxiliary circuit; first auxiliary switch tube Sa1And a third auxiliary switch tube Sa3Drain electrode of and auxiliary power supply VAUXIs connected with an auxiliary power supply VAUXAnd a second auxiliary switch tube Sa2Source electrode of (1), fourth auxiliary switch tube Sa4The source electrodes of the two-way transistor are connected; primary winding T of auxiliary converter transformer1The synonym end of the lead auxiliary switch bridge arm is connected with a point R of the middle point of the lead auxiliary switch bridge arm, and the synonym end of the lead auxiliary switch bridge arm is connected with a point W of the middle point of the lag auxiliary switch bridge arm; primary winding T of auxiliary converter transformer1The number of turns of and the first winding T2The turn ratio of (A) is 1/n; primary winding T of auxiliary converter transformer1With the number of turns of the second winding T3The turns ratio of (1/n).
As a further improvement of the above solution, when the main circuit switch S1，S4Conduction, S2，S3The off state is called release state a; main loop switch S2，S3Conduction, S1，S4The off state is called release state B; main loop switch S2，S4Conduction, S1，S3The off state is called a charging state I; main loop switch S1，S3Conduction, S2，S4The off state is called a charging state II; a normal switching cycle including a release state A or a release state B, a charge state I or a charge state II; an extended switching period (I)+Or II+) Only comprises a charging state I or a charging state II, and the duration time of the charging state I or the charging state II is one switching cycle time; for an alternating voltage period, the half period of L plus N minus is called a positive half period; the half period of L minus N plus is called as a negative half period; the energy release state of the positive half period is A only, and the energy charging states I or II are bothCan be prepared; the energy release state of the negative half period is only B, and the energy charging state I or II can be both; a switching period after the zero crossing point of the current in the positive and negative (negative and positive) half-cycle conversion process is called a transition working period; the working time period except the transition working time period is called as a normal working time period; in the normal working period, in a positive half period, controlling and arranging an odd number of switching periods, wherein AII switching periods and AII switching periods form a group, and repeating the cycle, wherein AII starts AII and ends AII; in the negative half period, odd switching periods are controlled and arranged, the BI switching period and the BI switching period form a group, the cycle is repeated, and the BI starts and ends; in the normal working period, in the process of converting current from the energy release state to the energy charging state, the auxiliary loop participates in the main loop switch current conversion to realize the zero-voltage switch current conversion, and there are four working processes which are respectively called as: the A left current-changing follow current A → I, the A right current-changing follow current A → II, the B right current-changing follow current B → I, the B left current-changing follow current B → II; in the transition working period, the main loop switch commutation does not occur in one switching period, and the extended switching period (I) is presented+Or II+) Status.
As a further improvement of the above, in VACIn the positive half period of the positive pole and the negative pole of the L pole of the alternating current power supply, the auxiliary commutation process comprises A left commutation follow current A → I and A right commutation follow current A → II, and the working flow and the switching time interval are as follows:
firstly, the calculation and derivation process of A left commutation follow current A → I is as follows:
when the L pole of the alternating current power supply is positive and the N pole of the alternating current power supply is negative, the working process and the switching time interval are as follows:
the circuit is in a steady state, S1、S4、Sa2、Sa4In the on state, S2、S3、Sa1、Sa3In an off state;
t0at time, turn off Sa4；
Sa4Delay after shutdown DA1Opening Sa3；
Figure GDA0003256910390000041
Opening Sa3After, delay DA2Turning off the main circuit switch S1；
Figure GDA0003256910390000042
Switch off the main circuit switch S1After, delay DA3Opening S2；
Figure GDA0003256910390000051
S2Keep on for a time delay DA4Turn off Sa2
Figure GDA0003256910390000052
Off Sa2After, delay DA5Opening Sa1；
Figure GDA0003256910390000053
According to the SPWM control of the main loop, after delaying the required time, the S is turned off2；
Secondly, the calculation and derivation processes of the A right commutation follow current A → II are as follows:
VACwhen the L pole of the alternating current power supply is positive and the N pole of the alternating current power supply is negative, the working process and the switching time interval are as follows:
the circuit is in a steady state, S1、S4、Sa1、Sa3In the on state, S2、S3、Sa2、Sa4In an off state;
t0at time, turn off Sa3；
Sa3Delayed after switch-off, switched-on Sa4；
Figure GDA0003256910390000054
Opening Sa4After, delay DA2Turning off the main circuit switch S4；
Figure GDA0003256910390000055
Switch off the main circuit switch S4After, delay DA3Opening S3
Figure GDA0003256910390000061
S3Keep on for a time delay DA4Turn off Sa1
Figure GDA0003256910390000062
Off Sa1After, delay DA5Opening Sa2；
Figure GDA0003256910390000063
According to the SPWM control of the main loop, after delaying the required time, the S is turned off3；
During the preceding operation, the current before commutation
Figure GDA0003256910390000064
And commutation excitation time Δ T (I)Tf) Comprises the following steps:
Figure GDA0003256910390000065
when I isTfWhen the content is equal to 0, the content,
Figure GDA0003256910390000066
is composed of
Figure GDA0003256910390000067
ΔT(ITf)＝T0-1+T1-2+T2-3+T3-4 (12)
Wherein:
Figure GDA0003256910390000068
Figure GDA0003256910390000069
Figure GDA00032569103900000610
Figure GDA0003256910390000071
all delays D given aboveA1～DA5In the expression (2), the related parameters are divided into two parts, namely input quantity and constrained quantity:
the input quantity is as follows: input DC voltage VDC(ii) a Auxiliary voltage VAUX(ii) a Switching frequency fsw(ii) a Parasitic capacitance C of all switches of main loop1＝C2＝C3＝C4＝Cm-oss(ii) a Parasitic capacitance C of all switches of auxiliary circuita1＝Ca2＝Ca3＝Ca4＝Ca-oss(ii) a Freewheeling diode capacitor CN1＝CN2＝CN3＝CN4＝CN(ii) a Filter inductance LTf(ii) a The parameters of the transformer are the number of turns of the primary side, the magnetic core, the turn ratio of 1/n and the filter inductance current ITfTime period (ZVS time period) T during which the main switch can be turned on at zero voltagemZVSCurrent-converting resonant current IrIs a resonant current iLrPart of the peak exceeding the load current, auxiliary switchTurn off ZVS commutation time TaZVS；
The constrained amount is: commutation resonance inductor Lr1And Lr2And an excitation inductor LmAuxiliary loop sleep minimum current
Figure GDA0003256910390000072
The system of constraint equations between is:
Figure GDA0003256910390000073
as a further improvement of the above scheme, the specific flow and the interval time of each stage in a positive half cycle are as follows:
firstly, the calculation and derivation process of A left commutation follow current A → I is as follows:
A-I mode 1: initial follow current phase (t)<t0): the circuit is in a stable state, and the main switch tube S1And S4Conducting; load current iTfBy S4Afterflow; auxiliary switch tube Sa2、Sa4Conducting, exciting current iLmInitial value is
Figure GDA0003256910390000074
Excitation current iLmThe actual current direction is the inflow W point;
A-I mode 2, t0-t1：t0Time of day, turn off the hysteresis auxiliary switch tube Sa4(ii) a Commutation inductor Lr1Inductance folded to primary side by transformer
Figure GDA0003256910390000081
Excitation inductance LmAnd an auxiliary capacitor Ca3And Ca4Resonance occurs; auxiliary capacitance Ca3Discharge Ca4Charging, and increasing the potential of a point W; the auxiliary converter transformer generates a resonant current i which increases from zero on the secondary sideLrResonant current iLrCurrent reduced to primary side by transformer
Figure GDA0003256910390000082
Referred to as the primary current; excitation current
Figure GDA0003256910390000083
From an initial value
Figure GDA0003256910390000084
Starting to change to the positive direction; elapsed time T0-1The potential of the W point rises to VAUX；
Equivalent auxiliary capacitor C at this stageA_oss＝2Ca_ossAn absorption capacitor C is connected in parallel with the auxiliary switch tubea3And Ca4Are connected in parallel; equivalent auxiliary capacitor C at this stageA_ossVoltage, current at both ends
Figure GDA0003256910390000085
The expression is as follows:
Figure GDA0003256910390000086
Figure GDA0003256910390000087
wherein:
Figure GDA0003256910390000088
Figure GDA0003256910390000089
the voltage peak of (a) is:
Figure GDA00032569103900000810
at t1At the moment, the lagging leg reaches ZVS commutation condition, i.e.
Figure GDA00032569103900000811
The time of this resonance phase is:
Figure GDA00032569103900000812
in addition, according to KCL, excitation current
Figure GDA00032569103900000813
And primary side current
Figure GDA00032569103900000814
Figure GDA00032569103900000815
Figure GDA00032569103900000816
A-I mode 3, t1-t2：t1Time of day, Da3Conducting naturally; hysteresis auxiliary switch tube Sa3Reaching the ZVS turn-on condition; excitation inductance LmThe voltage at two ends is opposite to the current direction, and the sum of the excitation current and the primary side reduced current is increased from negative to positive according to the reference direction; resonant inductor Lr1And Lr2Current i inLr(equal to each other, the resonance current iLr) A linear increase; t is tBAt the moment, the exciting current is reduced to zero, and the auxiliary switch tube S is laggeda3May be in the time period T1-BIs conducted between the two, and T is selected1-BAt intermediate time tATurn on the auxiliary switch Sa3；
The sum of the excitation current and the primary side current at this stage is:
Figure GDA0003256910390000091
wherein:
Figure GDA0003256910390000092
at tBThe sum of the moment excitation current and the primary side current is as follows:
Figure GDA0003256910390000093
auxiliary pipe Sa4The on-time of (c) is:
Figure GDA0003256910390000094
the resonance current is:
Figure GDA0003256910390000095
wherein:
Figure GDA0003256910390000096
VA'UX＝nVAUX (32)
t2time of day, resonant current iLrThe value of (d) increases to a maximum value:
iLr(t2)＝Ir+iTf (33)
wherein: i isrIn order to commutate the resonant current,
T1-2the duration of (c) is:
Figure GDA0003256910390000097
Figure GDA0003256910390000101
A-I mode 4, t2-t3：t2Time of day, resonant current iLrTo a maximum value iLr-maxMain switch S1Turning off; current-converting resonant current IrTo the capacitor C1Charging C2Discharging, and the potential of the point P begins to drop;
the equivalent main capacitor is a main switch tube and is connected with an absorption capacitor C in parallel1And C2Are connected in parallel; voltage across it
Figure GDA0003256910390000102
And a resonant current iLrThe expression is as follows:
Figure GDA0003256910390000103
Figure GDA0003256910390000104
wherein:
Figure GDA0003256910390000105
Figure GDA0003256910390000106
the voltage peak of (a) is expressed as:
Figure GDA0003256910390000107
t3time S1ZVS commutation conditions are met, namely:
Figure GDA0003256910390000108
the duration of this phase is:
Figure GDA0003256910390000109
Figure GDA00032569103900001010
A-I mode 5, t3-t4: at t3At that time, the potential at point P is reduced to 0, D2Naturally conducting, main switch S2Reaching the ZVS turn-on condition; t is tDTime of day, resonant current
Figure GDA00032569103900001011
Down to the load current iTfMain switch tube S2May be in the time period T3-DIs conducted between the two, and T is selected3-DAt intermediate time tCTurn on the main switch S2(ii) a The main switch bridge arm completes the soft commutation process;
the duration of the ZVS on stage of the main switch is as follows:
Figure GDA0003256910390000111
wherein:
Figure GDA0003256910390000112
commutation inductor LrThe linear discharge phase duration is:
Figure GDA0003256910390000113
Figure GDA0003256910390000114
in the A-I mode 5, the structure of the crystal,t4-t5: at t4Time of day, resonant current iLrReduced to 0A, exciting current
Figure GDA0003256910390000115
Increase according to the reference direction to
Figure GDA0003256910390000116
Cut-off advanced auxiliary tube Sa2(ii) a Excitation current
Figure GDA0003256910390000117
To Ca1Discharge Ca2Charging, and the potential of the R point begins to rise; t is t5At that time, the potential at the point R rises to VAUX，Da1Conducting naturally;
duration of current change in the forearm:
Figure GDA0003256910390000118
Figure GDA0003256910390000119
A-I mode 6, t5And then: t is t5At that time, the potential at the point R rises to VAUX，Da1Conducting naturally; t is tETime of day, control and conduct the advanced auxiliary tube Sa1A gate electrode of (1);
Figure GDA00032569103900001110
wherein, TaZVSInputting the quantity for the system;
Figure GDA00032569103900001111
tEthen, the main loop is in a charging state I, and the auxiliary loop returns to the initial state of the working process; according to the requirements of SPWM control, turn offBroken S2Through natural commutation, the main loop returns to a follow current state A;
secondly, the calculation and derivation processes of the A right commutation follow current A → II are as follows:
A-II mode 1, t<t6: the circuit is in a stable state, and the main switch tube S1And S4Conducting; load current iTfBy S4Afterflow; auxiliary switch tube Sa1、Sa3Conducting, exciting current iLmInitial value is
Figure GDA0003256910390000121
Excitation current iLmThe actual current direction is the inflow R point;
A-II mode 2, t6-t7：t6Time of day, turn off the hysteresis auxiliary switch tube Sa3(ii) a Commutation inductor Lr2Inductance folded to primary side by transformer
Figure GDA0003256910390000122
Excitation inductance LmAnd an auxiliary capacitor Ca3And Ca4Resonance occurs; auxiliary capacitance Ca3Charging Ca4Discharging, and the potential of the point W is reduced; the auxiliary converter transformer generates a resonant current i which increases from zero on the secondary sideLrResonant current iLrCurrent ni reduced to the primary side by a transformerLrReferred to as the primary current; excitation current iLmFrom an initial value
Figure GDA0003256910390000123
Beginning to decrease in the positive direction; elapsed time T6-7The potential of the point W is reduced to 0;
equivalent auxiliary capacitor C at this stageA_oss＝2Ca_ossAn absorption capacitor C is connected in parallel with the auxiliary switch tubea3And Ca4Are connected in parallel; equivalent auxiliary capacitor C at this stageA_ossVoltage across
Figure GDA0003256910390000124
Electric current
Figure GDA0003256910390000125
The expression is as follows:
Figure GDA0003256910390000126
Figure GDA0003256910390000127
wherein:
Figure GDA0003256910390000128
Figure GDA0003256910390000129
the voltage peak of (a) is:
Figure GDA00032569103900001210
at t7At the moment, the lagging leg reaches ZVS commutation condition, i.e.
Figure GDA00032569103900001211
The time of this resonance phase is:
Figure GDA00032569103900001212
in addition, according to KCL, excitation current
Figure GDA0003256910390000131
And primary side current
Figure GDA0003256910390000132
Figure GDA0003256910390000133
Figure GDA0003256910390000134
A-II mode 3, t7-t8：t7Time of day, Da4Conducting naturally; hysteresis auxiliary switch tube Sa4Reaching the ZVS turn-on condition; excitation inductance LmThe voltage at two ends is opposite to the current direction, and the sum of the excitation current and the primary side current is linearly reduced according to the reference direction; resonant inductor Lr1And Lr2Current i inLr(equal to each other, the resonance current iLr) A linear increase; t is tGAt the moment, the current decreases to zero, lagging the auxiliary switch tube Sa4May be in the time period T7-GIs conducted between the two, and T is selected7-GAt intermediate time tFTurn on the auxiliary switch Sa4；
The sum of the excitation current and the primary side current at this stage is:
Figure GDA0003256910390000135
wherein:
Figure GDA0003256910390000136
at tGThe sum of the moment excitation current and the primary side current is as follows:
Figure GDA0003256910390000137
auxiliary pipe Sa4The on-time of (c) is:
Figure GDA0003256910390000138
the resonance current is:
Figure GDA0003256910390000139
wherein:
Figure GDA00032569103900001310
VA'UX＝nVAUX (65)
t8time of day, resonant current iLrThe value of (d) increases to a maximum value:
iLr(t8)＝Ir+iTf (66)
wherein: i isrThe resonant current is commutated.
Charging phase T7-8The duration of (c) is:
Figure GDA0003256910390000141
A-II mode 4, t8-t9：t8Time of day, resonant current iLrTo a maximum value iLr-maxMain switch S4Turning off; current-converting resonant current IrTo the capacitor C1Charging C2Discharging, and the potential of the Q point begins to rise;
equivalent main capacitor CM_oss＝2Cm_ossA main switch tube connected in parallel with an absorption capacitor C1And C2Are connected in parallel; voltage across it
Figure GDA0003256910390000142
And a resonant current iLrThe expression is as follows:
Figure GDA0003256910390000143
Figure GDA0003256910390000144
wherein:
Figure GDA0003256910390000145
Figure GDA0003256910390000146
the voltage peak of (a) is expressed as:
Figure GDA0003256910390000147
t9time of day, S3ZVS commutation conditions are met, namely:
Figure GDA0003256910390000148
the duration of this phase is:
Figure GDA0003256910390000149
A-II mode 5, t9-t10: at t9At that time, the potential at the point Q rises to VDC，D3Naturally conducting, main switch S3Reaching the ZVS turn-on condition; t is tITime of day, resonant current iLrDown to the load current iTfMain switch tube S3May be in the time period T9-IIs conducted between the two, and T is selected9-IAt intermediate time tHTurn on the main switch S3(ii) a The main switch bridge arm completes the soft commutation process;
the duration of the ZVS on stage of the main switch is as follows:
Figure GDA0003256910390000151
wherein:
Figure GDA0003256910390000152
commutation inductor LrThe linear discharge phase duration is:
Figure GDA0003256910390000153
A-II mode 6, t10-t11: at t10Time of day, resonant current iLrReduced to 0A, exciting current
Figure GDA0003256910390000154
Increase in the reverse direction according to the reference direction
Figure GDA0003256910390000155
Cut-off advanced auxiliary tube Sa1(ii) a Excitation current
Figure GDA0003256910390000156
To Ca1Charging Ca2Discharging, and starting to approximately linearly reduce the potential of the R point; t is t11At that time, the potential at the point R drops to 0, Da2Conducting naturally;
duration of current change in the forearm:
Figure GDA0003256910390000157
A-II mode 7, t11And then: t is t11At that time, the potential at the point R drops to 0, Da2Conducting naturally; at the moment of tJ, the leading auxiliary tube S is controlled to be turned ona2A gate electrode of (1);
Figure GDA0003256910390000158
wherein, TaZVSInputting the quantity for the system;
tJthen, the main loop is in a charging state II, and the auxiliary loop returns to the initial state of the working process; turn off S as required by SPWM control3Through natural commutation, the main loop returns to a follow current state A;
the aforementioned thirteen modalities, VACIn the half period of the positive pole and the negative pole of the L pole of the alternating current power supply, the main loop realizes the realization process of switching the energy release state to the energy charging state I and switching the energy release state to the energy charging state II; wherein the action is a right auxiliary loop and a left auxiliary loop works; at VACIn the other half period of the L pole, the negative pole and the positive pole of the alternating current power supply, the working mechanism is B right conversion follow current B → I, B left conversion follow current B → II; operating as described above, only the current direction is reversed.
The invention has the beneficial effects that:
compared with the prior art, the bridgeless double-Boost power factor correction rectifier with the left-right alternating auxiliary commutation can realize ZVS (zero voltage switching) conduction of the main loop switch and the auxiliary loop switch. The full-control switch replaces a rectifier diode of a basic bridgeless circuit, and a main loop has two energy charging states. The auxiliary loop working alternately realizes the bidirectional reset of the exciting current, thereby reducing the volume of the magnetic core of the transformer. The secondary winding coupling of the transformer reduces the voltage stress of the auxiliary converter diode.
Drawings
The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings, in which:
FIG. 1 is a circuit of an improved bridgeless double-Boost power factor correction rectifier for up-down alternate auxiliary commutation according to the present invention;
FIG. 2 is a schematic diagram of two charging states of the main circuit of the present invention, wherein charging state I is shown in FIG. 2(a) and charging state II is shown in FIG. 2 (b);
FIG. 3 is a circuit diagram of an energy release state A when an AC power supply L is positive and negative and an energy release state B when the AC power supply L is negative and positive, and FIG. 3(a) is a circuit diagram of the energy release state A when the AC power supply L is positive and negative; FIG. 3(B) is a circuit diagram of the energy release state B with L minus N plus;
FIG. 4 is a timing diagram illustrating the switching of the operating states of the improved dual-boost topology of the present invention;
FIG. 5 shows the operation of the AC power supply of the present invention with the discharge state A returning to the charge states I and II when the AC power supply L is positive and negative, wherein (a) is the A-I mode 1 (t)<t0) A circuit diagram; (b) is A-I mode 2 (t)0-t1) A circuit diagram; (c) is A-I mode 3 (t)1-t2) A circuit diagram; (d) is A-I mode 4 (t)2-t3) A circuit diagram; (e) is A-I mode 5 (t)3-t4) A circuit diagram; (f) is A-I mode 6 (t)4-t5) A circuit diagram; (g) is A-I mode 7 (t)5-) a circuit diagram; (h) is A-II mode 1 (t)<t6) A circuit diagram; (i) is A-II mode 2 (t)6-t7) A circuit diagram; (j) is A-II mode 3 (t)7-t8) A circuit diagram; (k) is A-II mode 4 (t)8-t9) A circuit diagram; (i) is A-II mode 5 (t)9-t10) A circuit diagram; (m) is A-II mode 7 (t)10-t11) A circuit diagram; (n) is A-II mode 7 (t)11-) a circuit diagram;
FIG. 6 is a schematic diagram of the equivalent circuit of mode 2 in a PWM switching cycle according to the present invention;
FIG. 7 is a schematic diagram of a mode 3 equivalent circuit in a PWM switching cycle according to the present invention;
FIG. 8 is a schematic diagram of a mode 4 equivalent circuit in a PWM switching cycle according to the present invention;
FIG. 9 is a waveform diagram of the driving pulse signals of each switching tube, the main node voltage and the branch current in a PWM switching period when the AC power supply L is positive and negative.
Detailed Description
The invention provides a bridgeless double-Boost power factor correction rectifier with left-right alternate auxiliary commutation, which comprises a first main switching tube S1A second main switch tube S2And the third main switch tube S3The fourth main switch tube S4Filter inductor Tf1Filter inductor Tf2AC power supply VACDC power supply VDCAuxiliary power supply VAUXA first commutation diode DN1The first stepTwo-current conversion diode DN2A third commutation diode DN3And a fourth conversion diode DN4Auxiliary converter transformer primary winding T1A first winding T of the secondary side of the transformer2Auxiliary secondary side second winding T of auxiliary converter transformer3Auxiliary transformer secondary side third winding T4Auxiliary fourth winding T of auxiliary converter transformer5Resonant inductor Lr1Resonant inductor Lr2A first auxiliary switch tube Sa1A second auxiliary switch tube Sa2The third auxiliary switch tube Sa3The fourth auxiliary switch tube Sa4The leading bridge arm AC-Lead of the left commutation auxiliary circuit and the lagging bridge arm AC-Lag of the left commutation auxiliary circuit. The first main switch tube S1Source electrode, second main switch tube2The drain electrode is connected with a point P to form a left bridge arm of the main switch; third main switch tube S3Source electrode and fourth main switch tube S4The drain electrode of the switch is connected with a point Q to form a main switch right bridge arm; filter inductance Tf1One end of (1) and an AC power supply VACThe other end of the L-shaped end is connected with the point P; filter inductance Tf2One end of (1) and an AC power supply VACThe other end of the N-shaped contact is connected with a point Q; first commutation diode DN1The positive pole and the first winding T of the secondary side of the transformer2Is connected with the same name terminal of the first inverting diode DN2And the secondary side second winding T of the auxiliary converter transformer3The different name ends are connected; third commutation diode DN3The anode of the transformer and a secondary side third winding T of the transformer4Is connected with the different name end of the fourth conversion diode DN4Negative pole of the auxiliary converter transformer and a secondary fourth winding T of the auxiliary converter transformer5The same name end of the terminal is connected; auxiliary side first winding T of auxiliary converter transformer2Different name end, auxiliary side second winding T of auxiliary converter transformer3Is connected to the point O1Auxiliary converter transformer secondary third winding T4The same name end of the auxiliary converter transformer and the secondary fourth winding T of the auxiliary converter transformer5Is connected to the point O2(ii) a First main switch tube S1Drain electrode of (1), third main switching tube S3The first conversion diode DN1Negative electrode of (2), third commutation current of twoPolar tube DN3And a negative electrode of (2) and a DC power supply VDCThe positive electrodes are connected; second main switch tube S2Source electrode of (1), fourth main switching tube S4Source of (1), second conversion diode DN2Positive electrode of (1), fourth conversion diode DN4And a direct current power supply VDCThe negative electrodes are connected; resonant inductor Lr1One end of the main switch is connected with the midpoint P of the left bridge arm of the main switch, and the other end of the main switch is connected with the point O1Connecting; resonant inductor Lr2One end of the main switch is connected with a midpoint Q point of a right bridge arm of the main switch, and the other end of the main switch is connected with O2Connecting; first auxiliary switch tube Sa1Source electrode of and second auxiliary switch tube Sa2The drain electrode of the left converter auxiliary circuit is connected with the R point, and the two switching tubes form an advanced bridge arm AC-Lead of the left converter auxiliary circuit; third auxiliary switch tube Sa3Source electrode of and fourth auxiliary switch tube Sa4The drain electrode of the left converter auxiliary circuit is connected with a W point, and the two switching tubes form a hysteresis bridge arm AC-Lag of the left converter auxiliary circuit; first auxiliary switch tube Sa1And a third auxiliary switch tube Sa3Drain electrode of and auxiliary power supply VAUXIs connected with an auxiliary power supply VAUXAnd a second auxiliary switch tube Sa2Source electrode of (1), fourth auxiliary switch tube Sa4The source electrodes of the two-way transistor are connected; primary winding T of auxiliary converter transformer1The synonym end of the lead auxiliary switch bridge arm is connected with a point R of the middle point of the lead auxiliary switch bridge arm, and the synonym end of the lead auxiliary switch bridge arm is connected with a point W of the middle point of the lag auxiliary switch bridge arm; primary winding T of auxiliary converter transformer1Number of turns of and secondary winding T2The turn ratio of (A) is 1/n; primary winding T of auxiliary converter transformer1Number of turns of and secondary winding T3The turns ratio of (1/n).
As a further improvement of the above solution, when the main circuit switch S1，S4Conduction, S2，S3The off state is called release state a; main loop switch S2，S3Conduction, S1，S4The off state is called release state B; main loop switch S2，S4Conduction, S1，S3The off state is called a charging state I; main loop switch S1，S3Conduction, S2，S4The off state is called a charging state II; a normal switching cycle including a release state A or a release state B, a charge state I or a charge state II; an extended switching period (I)+Or II+) Only comprises a charging state I or a charging state II, and the duration time of the charging state I or the charging state II is one switching cycle time; for an alternating voltage period, the half period of L plus N minus is called a positive half period; the half period of L minus N plus is called as a negative half period; the energy release state of the positive half period is only A, and the energy charging state I or II can be both; the energy release state of the negative half period is only B, and the energy charging state I or II can be both; a switching period after the zero crossing point of the current in the positive and negative (negative and positive) half-cycle conversion process is called a transition working period; the working time period except the transition working time period is called as a normal working time period; in the normal working period, in a positive half period, controlling and arranging an odd number of switching periods, wherein AII switching periods and AII switching periods form a group, and repeating the cycle, wherein AII starts AII and ends AII; in the negative half period, odd switching periods are controlled and arranged, the BI switching period and the BI switching period form a group, the cycle is repeated, and the BI starts and ends; in the normal working period, in the process of converting current from the energy release state to the energy charging state, the auxiliary loop participates in the main loop switch current conversion to realize the zero-voltage switch current conversion, and there are four working processes which are respectively called as: the A left current-changing follow current A → I, the A right current-changing follow current A → II, the B right current-changing follow current B → I, the B left current-changing follow current B → II; in the transition working period, the main loop switch commutation does not occur in one switching period, and the extended switching period (I) is presented+Or II+) Status.
The PFC current control function in the main loop is realized by different time ratios of charging and discharging of a filter inductor of a main switch switching structure. Since the filter inductor is large enough, the filter inductor current is considered constant during one PWM switching period.
When the alternating current power supply L is positive and negative, the energy release state current flows back to the energy charging state, and the upper left auxiliary loop and the lower right auxiliary loop supply energy and flow current.
Actual working process
VACIn a positive half period of the L pole, the N pole and the negative pole of the alternating current power supply, the auxiliary commutation process comprises A left commutation follow current A → I and A right commutation follow current A → II. Work flow andthe switching time interval is:
first, A left commutation follow current A → I
VACWhen the L pole of the alternating current power supply is positive and the N pole of the alternating current power supply is negative, the working process and the switching time interval are as follows:
the circuit is in a steady state, S1、S4、Sa2、Sa4In the on state, S2、S3、Sa1、Sa3In an off state.
t0At time, turn off Sa4；
Sa4Delay after shutdown DA1Opening Sa3；
Figure GDA0003256910390000211
Opening Sa3After, delay DA2Turning off the main circuit switch S1；
Figure GDA0003256910390000212
Switch off the main circuit switch S1After, delay DA3Opening S2；
DA3＝26.7nS (81)
S2Keep on for a time delay DA4Turn off Sa2
DA4＝(5.0ITf+92.5)nS (82)
Off Sa2After, delay DA5Opening Sa1。
Figure GDA0003256910390000213
According to the SPWM control of the main loop, after delaying the required time, the S is turned off2。
Second, A right commutation follow current A → II
VACPositive pole N of AC power supply LWhen the polarity is negative, the working process and the switching time interval are as follows:
the circuit is in a steady state, S1、S4、Sa1、Sa3In the on state, S2、S3、Sa2、Sa4In an off state.
t0At time, turn off Sa3；
Sa3Delay after shutdown DA1Opening Sa4；
Figure GDA0003256910390000214
Opening Sa4After, delay DA2Turning off the main circuit switch S4；
Figure GDA0003256910390000215
Switch off the main circuit switch S4After, delay DA3Opening S3
DA3＝26.7nS (86)
S3Keep on for a time delay DA4Turn off Sa1
DA4＝(5.0ITf+92.5)nS (87)
Off Sa1After, delay DA5Opening Sa2。
Figure GDA0003256910390000221
According to the SPWM control of the main loop, after delaying the required time, the S is turned off3。
During the preceding operation, the current before commutation
Figure GDA0003256910390000222
And commutation excitation time Δ T (I)Tf) Comprises the following steps:
Figure GDA0003256910390000223
when I isTfWhen the content is equal to 0, the content,
Figure GDA0003256910390000224
is composed of
Figure GDA0003256910390000225
ΔT(ITf)＝T0-1+T1-2+T2-3+T3-4 (90)
Wherein:
Figure GDA0003256910390000226
Figure GDA0003256910390000227
T3-4＝4.9(4.5+ITf)nS (93)
the parameters of the elements involved in the circuit are divided into two parts, namely input quantity and constrained quantity:
the specific elements and parameters are shown in table 1, covering all inputs:
table 1 table of specific parameters of input amount in examples
Figure GDA0003256910390000228
Figure GDA0003256910390000231
The bound amount can be found:
commutation inductor Lr1＝Lr2＝Lr＝1.69μH
Excitation inductance Lm＝0.8μH
Auxiliary loop sleep minimum current
Figure GDA0003256910390000232
The above embodiments are not limited to the technical solutions of the embodiments themselves, and the embodiments may be combined with each other into a new embodiment. The above embodiments are only for illustrating the technical solutions of the present invention and are not limited thereto, and any modification or equivalent replacement without departing from the spirit and scope of the present invention should be covered within the technical solutions of the present invention.

Claims (4)

1. A bridge-free double-Boost power factor correction rectifier for left-right alternate auxiliary commutation is characterized in that: comprises a first main switch tube S1A second main switch tube S2And the third main switch tube S3The fourth main switch tube S4Filter inductor Tf1Filter inductor Tf2AC power supply VACDC power supply VDCAuxiliary power supply VAUXA first commutation diode DN1A second commutation diode DN2A third commutation diode DN3And a fourth conversion diode DN4Auxiliary converter transformer primary winding T1A first winding T of the secondary side of the transformer2Auxiliary secondary side second winding T of auxiliary converter transformer3Auxiliary transformer secondary side third winding T4Auxiliary fourth winding T of auxiliary converter transformer5Resonant inductor Lr1Resonant inductor Lr2A first auxiliary switch tube Sa1A second auxiliary switch tube Sa2The third auxiliary switch tube Sa3The fourth auxiliary switch tube Sa4An advanced bridge arm AC-Lead of the left commutation auxiliary circuit, a Lag bridge arm AC-Lag of the left commutation auxiliary circuit, and the first main switch tube S1Source electrode, second main switch tube2The drain electrode is connected with a point P to form a left bridge arm of the main switch; third main switch tube S3Source electrode and fourth main switch tube S4The drain electrode of the switch is connected with a point Q to form a main switch right bridge arm; filter inductance Tf1One end of (1) and an AC power supply VACIs connected to the L-terminal ofOne end is connected with the point P; filter inductance Tf2One end of (1) and an AC power supply VACThe other end of the N-shaped contact is connected with a point Q; first commutation diode DN1The positive pole and the first winding T of the secondary side of the transformer2Is connected with the same name terminal of the first inverting diode DN2And the secondary side second winding T of the auxiliary converter transformer3The different name ends are connected; third commutation diode DN3The anode of the transformer and a secondary side third winding T of the transformer4Is connected with the different name end of the fourth conversion diode DN4Negative pole of the auxiliary converter transformer and a secondary fourth winding T of the auxiliary converter transformer5The same name end of the terminal is connected; auxiliary side first winding T of auxiliary converter transformer2Different name end, auxiliary side second winding T of auxiliary converter transformer3Is connected to the point O1Auxiliary converter transformer secondary third winding T4The same name end of the auxiliary converter transformer and the secondary fourth winding T of the auxiliary converter transformer5Is connected to the point O2(ii) a First main switch tube S1Drain electrode of (1), third main switching tube S3The first conversion diode DN1Negative electrode of (1), third inverter diode DN3And a negative electrode of (2) and a DC power supply VDCThe positive electrodes are connected; second main switch tube S2Source electrode of (1), fourth main switching tube S4Source of (1), second conversion diode DN2Positive electrode of (1), fourth conversion diode DN4And a direct current power supply VDCThe negative electrodes are connected; resonant inductor Lr1One end of the main switch is connected with the midpoint P of the left bridge arm of the main switch, and the other end of the main switch is connected with the point O1Connecting; resonant inductor Lr2One end of the main switch is connected with a midpoint Q point of a right bridge arm of the main switch, and the other end of the main switch is connected with O2Connecting; first auxiliary switch tube Sa1Source electrode of and second auxiliary switch tube Sa2The drain electrode of the left converter auxiliary circuit is connected with the R point, and the two switching tubes form an advanced bridge arm AC-Lead of the left converter auxiliary circuit; third auxiliary switch tube Sa3Source electrode of and fourth auxiliary switch tube Sa4The drain electrode of the left converter auxiliary circuit is connected with a W point, and the two switching tubes form a hysteresis bridge arm AC-Lag of the left converter auxiliary circuit; first auxiliary switch tube Sa1And a third auxiliary switch tube Sa3Drain electrode of and auxiliary power supply VAUXIs connected with an auxiliary power supply VAUXAnd a second auxiliary switch tube Sa2Source electrode of (1), fourth auxiliary switch tube Sa4The source electrodes of the two-way transistor are connected; primary winding T of auxiliary converter transformer1The synonym end of the lead auxiliary switch bridge arm is connected with a point R of the middle point of the lead auxiliary switch bridge arm, and the synonym end of the lead auxiliary switch bridge arm is connected with a point W of the middle point of the lag auxiliary switch bridge arm; primary winding T of auxiliary converter transformer1The number of turns of and the first winding T2The turn ratio of (A) is 1/n; primary winding T of auxiliary converter transformer1With the number of turns of the second winding T3The turns ratio of (1/n).
2. The bridgeless double-Boost power factor correction rectifier with left-right alternating auxiliary commutation according to claim 1, characterized in that: when the main loop switch S1，S4Conduction, S2，S3The off state is called release state a; main loop switch S2，S3Conduction, S1，S4The off state is called release state B; main loop switch S2，S4Conduction, S1，S3The off state is called a charging state I; main loop switch S1，S3Conduction, S2，S4The off state is called a charging state II; a normal switching cycle including a release state A or a release state B, a charge state I or a charge state II; an extended switching period (I)+Or II+) Only comprises a charging state I or a charging state II, and the duration time of the charging state I or the charging state II is one switching cycle time; for an alternating voltage period, the half period of L plus N minus is called a positive half period; the half period of L minus N plus is called as a negative half period; the energy release state of the positive half period is only A, and the energy charging state I or II can be both; the energy release state of the negative half period is only B, and the energy charging state I or II can be both; a switching period after the zero crossing point of the current in the positive and negative (negative and positive) half-cycle conversion process is called a transition working period; the other working periods except the transition working period are called as normal working periods; in the normal working period, in a positive half period, controlling and arranging an odd number of switching periods, wherein AII switching periods and AII switching periods form a group, and repeating the cycle, wherein AII starts AII and ends AII; negative half cycle, control arrangementA plurality of switching periods, wherein the BI switching period and the BI switching period form a group, the cycle is repeated, and the BI starts and ends; in the normal working period, in the process of converting current from the energy release state to the energy charging state, the auxiliary loop participates in the main loop switch current conversion to realize the zero-voltage switch current conversion, and there are four working processes which are respectively called as: the A left current-changing follow current A → I, the A right current-changing follow current A → II, the B right current-changing follow current B → I, the B left current-changing follow current B → II; in the transition working period, the main loop switch commutation does not occur in one switching period, and the extended switching period (I) is presented+Or II+) Status.
3. The bridgeless double-Boost power factor correction rectifier with left-right alternating auxiliary commutation according to claim 2, characterized in that: at VACIn the positive half period of the positive pole and the negative pole of the L pole of the alternating current power supply, the auxiliary commutation process comprises A left commutation follow current A → I and A right commutation follow current A → II, and the working flow and the switching time interval are as follows:
firstly, the calculation and derivation process of A left commutation follow current A → I is as follows:
when the L pole of the alternating current power supply is positive and the N pole of the alternating current power supply is negative, the working process and the switching time interval are as follows:
the circuit is in a steady state, S1、S4、Sa2、Sa4In the on state, S2、S3、Sa1、Sa3In an off state;
t0at time, turn off Sa4；
Sa4Delay after shutdown DA1Opening Sa3；
Figure FDA0003256910380000021
Opening Sa3After, delay DA2Turning off the main circuit switch S1；
Figure FDA0003256910380000022
Switch off the main circuit switch S1After, delay DA3Opening S2；
Figure FDA0003256910380000031
S2Keep on for a time delay DA4Turn off Sa2
Figure FDA0003256910380000032
Off Sa2After, delay DA5Opening Sa1；
Figure FDA0003256910380000033
According to the SPWM control of the main loop, after delaying the required time, the S is turned off2；
Secondly, the calculation and derivation processes of the A right commutation follow current A → II are as follows:
VACwhen the L pole of the alternating current power supply is positive and the N pole of the alternating current power supply is negative, the working process and the switching time interval are as follows:
the circuit is in a steady state, S1、S4、Sa1、Sa3In the on state, S2、S3、Sa2、Sa4In an off state; t is t0At time, turn off Sa3；
Sa3Delayed after switch-off, switched-on Sa4；
Figure FDA0003256910380000034
Opening Sa4After, delay DA2Turning off the main circuit switch S4；
Figure FDA0003256910380000035
Switch off the main circuit switch S4After, delay DA3Opening S3
Figure FDA0003256910380000041
S3Keep on for a time delay DA4Turn off Sa1
Figure FDA0003256910380000042
Off Sa1After, delay DA5Opening Sa2；
Figure FDA0003256910380000043
According to the SPWM control of the main loop, after delaying the required time, the S is turned off3；
During the preceding operation, the current before commutation
Figure FDA0003256910380000044
And commutation excitation time Δ T (I)Tf) Comprises the following steps:
Figure FDA0003256910380000045
when in use
Figure FDA0003256910380000046
When the temperature of the water is higher than the set temperature,
Figure FDA0003256910380000047
is composed of
Figure FDA0003256910380000048
ΔT(ITf)＝T0-1+T1-2+T2-3+T3-4 (12)
Wherein:
Figure FDA0003256910380000049
Figure FDA00032569103800000410
Figure FDA00032569103800000411
Figure FDA00032569103800000412
all delays D given aboveA1～DA5In the expression (2), the related parameters are divided into two parts, namely input quantity and constrained quantity:
the input quantity is as follows: input DC voltage VDC(ii) a Auxiliary voltage VAUX(ii) a Switching frequency fsw(ii) a Parasitic capacitance C of all switches of main loop1＝C2＝C3＝C4＝Cm-oss(ii) a Parasitic capacitance C of all switches of auxiliary circuita1＝Ca2＝Ca3＝Ca4＝Ca-oss(ii) a Freewheeling diode capacitor CN1＝CN2＝CN3＝CN4＝CN(ii) a Filter inductance LTf(ii) a The parameters of the transformer are the number of turns of the primary side, the magnetic core, the turn ratio of 1/n and the filter inductance current ITfTime period (ZVS time period) T during which the main switch can be turned on at zero voltagemZVSCurrent-converting resonant current IrIs a resonant current iLrPart of the peak value exceeding the load current, auxiliary switch ZVS commutation time TaZVS；
The constrained amount is: commutation resonance inductor Lr1And Lr2And an excitation inductor LmAuxiliary loop sleep minimum current
Figure FDA0003256910380000057
The system of constraint equations between is:
Figure FDA0003256910380000051
4. the bridgeless double-Boost power factor correction rectifier with left-right alternating auxiliary commutation according to claim 3, characterized in that: the specific flow and the interval time of each stage in a positive half period are as follows:
firstly, the calculation and derivation process of A left commutation follow current A → I is as follows:
A-I mode 1: initial follow current phase (t < t)0): the circuit is in a stable state, and the main switch tube S1And S4Conducting; load current iTfBy S4Afterflow; auxiliary switch tube Sa2、Sa4Conducting, exciting current iLmInitial value is
Figure FDA0003256910380000058
Excitation current iLmThe actual current direction is the inflow W point;
A-I mode 2, t0-t1：t0Time of day, turn off the hysteresis auxiliary switch tube Sa4(ii) a Commutation inductor Lr1Inductance folded to primary side by transformer
Figure FDA0003256910380000052
Excitation inductance LmAnd an auxiliary capacitor Ca3And Ca4Resonance occurs; auxiliary capacitance Ca3Discharge Ca4Charging, and increasing the potential of a point W; auxiliary converter transformer pairThe edge generates a resonant current i which increases from zeroLrResonant current iLrCurrent reduced to primary side by transformer
Figure FDA0003256910380000053
Referred to as the primary current; excitation current
Figure FDA0003256910380000054
From an initial value
Figure FDA0003256910380000055
Starting to change to the positive direction; elapsed time T0-1The potential of the W point rises to VAUX；
Equivalent auxiliary capacitor C at this stageA_oss＝2Ca_ossAn absorption capacitor C is connected in parallel with the auxiliary switch tubea3And Ca4Are connected in parallel; equivalent auxiliary capacitor C at this stageA_ossVoltage, current at both ends
Figure FDA0003256910380000056
The expression is as follows:
Figure FDA0003256910380000061
Figure FDA0003256910380000062
wherein:
Figure FDA0003256910380000063
Figure FDA0003256910380000064
the voltage peak of (a) is:
Figure FDA0003256910380000065
at t1At the moment, the lagging leg reaches ZVS commutation condition, i.e.
Figure FDA0003256910380000066
The time of this resonance phase is:
Figure FDA0003256910380000067
in addition, according to KCL, excitation current
Figure FDA0003256910380000068
And primary side current
Figure FDA0003256910380000069
Figure FDA00032569103800000610
Figure FDA00032569103800000611
A-I mode 3, t1-t2：t1Time of day, Da3Conducting naturally; hysteresis auxiliary switch tube Sa3Reaching the ZVS turn-on condition; excitation inductance LmThe voltage at two ends is opposite to the current direction, and the sum of the excitation current and the primary side reduced current is increased from negative to positive according to the reference direction; resonant inductor Lr1And Lr2Current i inLr(equal to each other, the resonance current iLr) A linear increase; t is tBAt the moment, the exciting current is reduced to zero, and the auxiliary switch tube S is laggeda3Can be in timeSegment T1-BIs conducted between the two, and T is selected1-BAt intermediate time tATurn on the auxiliary switch Sa3；
The sum of the excitation current and the primary side current at this stage is:
Figure FDA00032569103800000612
wherein:
Figure FDA00032569103800000613
at tBThe sum of the moment excitation current and the primary side current is as follows:
Figure FDA0003256910380000071
auxiliary pipe Sa4The on-time of (c) is:
Figure FDA0003256910380000072
the resonance current is:
Figure FDA0003256910380000073
wherein:
Figure FDA0003256910380000074
V′AUX＝nVAUX (34)
t2time of day, resonant current iLrThe value of (d) increases to a maximum value:
iLr(t2)＝Ir+iTf (35)
wherein: i isrIn order to commutate the resonant current,
T1-2the duration of (c) is:
Figure FDA0003256910380000075
Figure FDA0003256910380000076
in the A-I mode 4, the structure of the crystal,
Figure FDA0003256910380000079
t2time of day, resonant current iLrTo a maximum value iLr-maxMain switch S1Turning off; current-converting resonant current IrTo the capacitor C1Charging C2Discharging, and the potential of the point P begins to drop;
the equivalent main capacitor is a main switch tube and is connected with an absorption capacitor C in parallel1And C2Are connected in parallel; voltage across it
Figure FDA00032569103800000710
And a resonant current iLrThe expression is as follows:
Figure FDA0003256910380000077
Figure FDA0003256910380000078
wherein:
Figure FDA0003256910380000081
Figure FDA0003256910380000082
the voltage peak of (a) is expressed as:
Figure FDA0003256910380000083
t3time S1ZVS commutation conditions are met, namely:
Figure FDA0003256910380000084
the duration of this phase is:
Figure FDA0003256910380000085
Figure FDA0003256910380000086
A-I mode 5, t3-t4: at t3At that time, the potential at point P is reduced to 0, D2Naturally conducting, main switch S2Reaching the ZVS turn-on condition; t is tDTime of day, resonant current
Figure FDA0003256910380000087
Down to the load current iTfMain switch tube S2May be in the time period T3-DIs conducted between the two, and T is selected3-DAt intermediate time tCTurn on the main switch S2(ii) a The main switch bridge arm completes the soft commutation process;
the duration of the ZVS on stage of the main switch is as follows:
Figure FDA0003256910380000088
wherein:
Figure FDA0003256910380000089
commutation inductor LrThe linear discharge phase duration is:
Figure FDA00032569103800000810
Figure FDA00032569103800000811
A-I mode 5, t4-t5: at t4Time of day, resonant current iLrReduced to 0A, exciting current
Figure FDA00032569103800000812
Increase according to the reference direction to
Figure FDA00032569103800000813
Cut-off advanced auxiliary tube Sa2(ii) a Excitation current
Figure FDA00032569103800000814
To Ca1Discharge Ca2Charging, and the potential of the R point begins to rise; t is t5At that time, the potential at the point R rises to VAUX，Da1Conducting naturally;
duration of current change in the forearm:
Figure FDA0003256910380000091
Figure FDA0003256910380000092
A-I mode 6, t5And then: t is t5At that time, the potential at the point R rises to VAUX，Da1Conducting naturally; t is tETime of day, control and conduct the advanced auxiliary tube Sa1A gate electrode of (1);
Figure FDA0003256910380000093
wherein, TaZVSInputting the quantity for the system;
Figure FDA0003256910380000094
tEthen, the main loop is in a charging state I, and the auxiliary loop returns to the initial state of the working process; turn off S as required by SPWM control2Through natural commutation, the main loop returns to a follow current state A;
secondly, the calculation and derivation processes of the A right commutation follow current A → II are as follows:
A-II mode 1, t<t6: the circuit is in a stable state, and the main switch tube S1And S4Conducting; load current iTfBy S4Afterflow; auxiliary switch tube Sa1、Sa3Conducting, exciting current iLmInitial value is
Figure FDA0003256910380000095
Excitation current iLmThe actual current direction is the inflow R point;
A-II mode 2, t6-t7：t6Time of day, turn off the hysteresis auxiliary switch tube Sa3(ii) a Commutation inductor Lr2Inductance folded to primary side by transformer
Figure FDA0003256910380000096
Excitation inductance LmAnd an auxiliary capacitor Ca3And Ca4Resonance occurs; auxiliary capacitance Ca3Charging of electricityCa4Discharging, and the potential of the point W is reduced; the auxiliary converter transformer generates a resonant current i which increases from zero on the secondary sideLrResonant current iLrCurrent ni reduced to the primary side by a transformerLrReferred to as the primary current; excitation current iLmFrom an initial value
Figure FDA0003256910380000097
Beginning to decrease in the positive direction; elapsed time T6-7The potential of the point W is reduced to 0;
equivalent auxiliary capacitor C at this stageA_oss＝2Ca_ossAn absorption capacitor C is connected in parallel with the auxiliary switch tubea3And Ca4Are connected in parallel; equivalent auxiliary capacitor C at this stageA_ossVoltage across
Figure FDA0003256910380000098
Electric current
Figure FDA0003256910380000099
The expression is as follows:
Figure FDA00032569103800000910
Figure FDA00032569103800000911
wherein:
Figure FDA0003256910380000101
Figure FDA0003256910380000102
the voltage peak of (a) is:
Figure FDA0003256910380000103
at t7At the moment, the lagging leg reaches ZVS commutation condition, i.e.
Figure FDA0003256910380000104
The time of this resonance phase is:
Figure FDA0003256910380000105
in addition, according to KCL, excitation current
Figure FDA0003256910380000106
And primary side current
Figure FDA0003256910380000107
Figure FDA0003256910380000108
Figure FDA0003256910380000109
A-II mode 3, t7-t8：t7Time of day, Da4Conducting naturally; hysteresis auxiliary switch tube Sa4Reaching the ZVS turn-on condition; excitation inductance LmThe voltage at two ends is opposite to the current direction, and the sum of the excitation current and the primary side current is linearly reduced according to the reference direction; resonant inductor Lr1And Lr2Current i inLr(equal to each other, the resonance current iLr) A linear increase; t is tGAt the moment, the current decreases to zero, lagging the auxiliary switch tube Sa4May be in the time period T7-GIs conducted between the two, and T is selected7-GAt intermediate time tFTurn on the auxiliary switch Sa4；
The sum of the excitation current and the primary side current at this stage is:
Figure FDA00032569103800001010
wherein:
Figure FDA00032569103800001011
at tGThe sum of the moment excitation current and the primary side current is as follows:
Figure FDA00032569103800001012
auxiliary pipe Sa4The on-time of (c) is:
Figure FDA0003256910380000111
the resonance current is:
Figure FDA0003256910380000112
wherein:
Figure FDA0003256910380000113
V′AUX＝nVAUX (67)
t8time of day, resonant current iLrThe value of (d) increases to a maximum value:
iLr(t8)＝Ir+iTf (68)
wherein: i isrTo convert harmonic wavesThe vibration current is generated by the vibration current,
charging phase T7-8The duration of (c) is:
Figure FDA0003256910380000114
A-II mode 4, t8-t9：t8Time of day, resonant current iLrTo a maximum value iLr-maxMain switch S4Turning off; current-converting resonant current IrTo the capacitor C1Charging C2Discharging, and the potential of the Q point begins to rise;
equivalent main capacitor CM_oss＝2Cm_ossA main switch tube connected in parallel with an absorption capacitor C1And C2Are connected in parallel; voltage across it
Figure FDA0003256910380000115
And a resonant current iLrThe expression is as follows:
Figure FDA0003256910380000116
Figure FDA0003256910380000117
wherein:
Figure FDA0003256910380000118
Figure FDA0003256910380000119
the voltage peak of (a) is expressed as:
Figure FDA00032569103800001110
t9time of day, S3ZVS commutation conditions are met, namely:
Figure FDA0003256910380000121
the duration of this phase is:
Figure FDA0003256910380000122
A-II mode 5, t9-t10: at t9At that time, the potential at the point Q rises to VDC，D3Naturally conducting, main switch S3Reaching the ZVS turn-on condition; t is tITime of day, resonant current
Figure FDA0003256910380000123
Down to the load current iTfMain switch tube S3May be in the time period T9-IIs conducted between the two, and T is selected9-IAt intermediate time tHTurn on the main switch S3(ii) a The main switch bridge arm completes the soft commutation process;
the duration of the ZVS on stage of the main switch is as follows:
Figure FDA0003256910380000124
wherein:
Figure FDA0003256910380000125
commutation inductor LrThe linear discharge phase duration is:
Figure FDA0003256910380000126
A-II mode 6, t10-t11: at t10Time of day, resonant current iLrReduced to 0A, exciting current
Figure FDA0003256910380000127
Increase in the reverse direction according to the reference direction
Figure FDA0003256910380000128
Cut-off advanced auxiliary tube Sa1(ii) a Excitation current
Figure FDA0003256910380000129
To Ca1Charging Ca2Discharging, and starting to approximately linearly reduce the potential of the R point; t is t11At that time, the potential at the point R drops to 0, Da2Conducting naturally;
duration of current change in the forearm:
Figure FDA00032569103800001210
A-II mode 7, t11And then: t is t11At that time, the potential at the point R drops to 0, Da2Conducting naturally; t is tJTime of day, control and conduct the advanced auxiliary tube Sa2A gate electrode of (1);
Figure FDA00032569103800001211
wherein, TaZVSInputting the quantity for the system;
tJthen, the main loop is in a charging state II, and the auxiliary loop returns to the initial state of the working process; turn off S as required by SPWM control3Through natural commutation, the main loop returns to a follow current state A;
the aforementioned thirteen modalities, VACIn the half period of the L pole positive pole and the N pole negative pole of the alternating current power supply, the main loop realizes the switching of the energy release state to the energy charging state I and the switching of the energy release state to the energy charging stateThe implementation process of the energy state II; wherein the action is a right auxiliary loop and a left auxiliary loop works; at VACIn the other half period of the L pole, the negative pole and the positive pole of the alternating current power supply, the working mechanism is B right conversion follow current B → I, B left conversion follow current B → II; operating as described above, only the current direction is reversed.
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