CN105356733B - A kind of two-stage type inverter and its control method for eliminating input current ripple - Google Patents
A kind of two-stage type inverter and its control method for eliminating input current ripple Download PDFInfo
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- CN105356733B CN105356733B CN201510740366.7A CN201510740366A CN105356733B CN 105356733 B CN105356733 B CN 105356733B CN 201510740366 A CN201510740366 A CN 201510740366A CN 105356733 B CN105356733 B CN 105356733B
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
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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
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac 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
- H02M7/537—Conversion of dc power input into ac 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, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac 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, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac 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, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
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Abstract
The invention discloses a kind of two-stage type inverter and its control method for eliminating input current ripple.The inverter includes DC power supply, input capacitance, primary side switch pipe, isolating transformer, secondary-side switch pipe, intermediate dc bus capacitance, the first inverter bridge leg and the second inverter bridge leg, filter circuit, auxiliary switch and auxiliary capacitor；Its control method is：Inverter bridge leg input current sampled value, intermediate dc bus voltage sample value obtain current reference by benchmark generative circuit, again by modulating wave generation module, pwm control circuit, zero-crossing comparator, logic circuit and drive circuit, so as to control its reference value of current tracking.The inverter adds auxiliary switch and auxiliary capacitor in isolating transformer auxiliary winding side so that the power ripple that exchange outlet side introduces all flows to auxiliary circuit, so as to achieve the purpose that to eliminate direct current input side current ripples.Primary side switch pipe is zero current turning-on, and secondary-side switch pipe is zero-current switching, reduces switching loss.
Description
Technical field
The present invention relates to a kind of two-stage type inverter and its control method for eliminating input current ripple.
Background technology
With the increasingly increase of energy-output ratio, the limited fossil fuel of reserves is increasingly reduced and exhaustion at last, development are clear
Clean, efficient, sustainable development new energy power technology becomes very urgent task.In new energy and other distributions
In electricity generation system, to obtain the High Level AC Voltage needed for load, the inverter with prime DC converter has obtained extensively
Application.Such as shown in attached drawing 1, for a kind of typical flyback two-stage type inverter.For this system, output AC power
In the two frequency multiplication power pulsations that contain feed back to direct current input side and show as low-frequency current ripple, storage battery, fuel electricity can be influenced
The service life of the input sources such as pond, can disturb the stability of DC power system when serious, therefore solve grid-connected power generation system
In current ripples problem, the utilization ratio for improving new energy is very urgent.In recent years, in order to solve this problem, occur
Some inverter topologies and control strategy on suppressing current ripples.In circuit and the United Nations General Assembly's electrolytic capacitor or LC
Resonance circuit, by the way that resonant circuit frequency is designed as twice of output frequency, it is possible to achieve the purpose of current ripples is eliminated, but
The service life of electrolytic capacitor is limited, and to filter out the inductance needed for low-frequency current ripple and capacitance volume is all bigger, reduces
The reliability and power density of system.Also active filter can be accessed in circuit, but extra increased circuit is necessarily required to
Extra control system, makes whole system all become complex, is unfavorable for integration.And auxiliary circuit is embedded into original
Converter in, only need to be suitably modified original control method and can realize the elimination of direct current input side current ripples.
The content of the invention
It is an object of the invention to provide a kind of elimination input current line for the technological deficiency present in above-mentioned inverter
The two-stage type inverter and its control method of ripple, which can not only realize that direct current becomes the inversion of exchange, and disappear at the same time
Except the current ripples of direct current input side, interference of the input current ripple to input source is reduced, improves system effectiveness.
The present invention to achieve the above object, adopts the following technical scheme that：
It is a kind of eliminate input current ripple two-stage type inverter include DC power supply, input capacitance, primary side switch pipe, every
First inverter bridge leg identical from transformer, secondary-side switch pipe, intermediate dc bus capacitance, structure and the second inverter bridge leg with
And filter circuit, wherein the cathode of DC power supply connect respectively input capacitance one end and isolating transformer primary side winding it is of the same name
End, the anode of DC power supply connect the other end of input capacitance and the emitter of primary side switch pipe, the current collection of primary side switch pipe respectively
Pole connects the primary side winding different name end of isolating transformer, and the collector of secondary-side switch pipe connects the vice-side winding different name of isolating transformer
End, the first inverter bridge leg and the second inverter bridge leg all include two switching tubes, collector, the secondary-side switch pipe of first switch pipe
Emitter and one end of intermediate dc bus capacitance connect and compose the positive input terminal of inverter bridge leg, the transmitting of second switch pipe
The other end of pole, the vice-side winding Same Name of Ends of isolating transformer and intermediate dc bus capacitance connects and composes the negative of inverter bridge leg
Input terminal, the emitter of first switch pipe connect and compose the output terminal of inverter bridge leg with the collector of second switch pipe, and first is inverse
The output for becoming bridge arm terminates to the anode of filter circuit, and the output of the second inverter bridge leg terminates to the negative terminal of filter circuit；Also wrap
Include the auxiliary circuit being made of two auxiliary windings of isolating transformer, auxiliary switch and auxiliary capacitor, wherein auxiliary switch
Pipe includes two switching tubes, the auxiliary winding of isolating transformer by the identical number of turn auxiliary winding Nx1、Nx2Composition, the first auxiliary
The collector of switching tube meets the first auxiliary winding Nx1Different name end, the emitter of the first auxiliary switch respectively with the second auxiliary
The collector of switching tube is connected with one end of auxiliary capacitor, and the emitter of the second auxiliary switch meets the second auxiliary winding Nx2's
Same Name of Ends, the other end of auxiliary capacitor meet the first auxiliary winding N respectivelyx1Same Name of Ends and the second auxiliary winding Nx2Different name
End.
A kind of control method for the two-stage type inverter for eliminating input current ripple, wherein, the control method of inverter bridge leg
For traditional single stage PWM modulation；It is further comprising the steps of：
Step A, detects auxiliary capacitor voltage signal, intermediate dc bus voltage signal, the input current letter of inverter bridge leg
Number；
Step B, the auxiliary capacitor voltage signal that step A is obtained input auxiliary capacitor voltage control circuit, are aided in
Capacitance voltage disturbing signal；
Step C, the intermediate dc bus voltage signal that step A is obtained input intermediate dc bus voltage control circuit,
Obtain intermediate dc bus voltage disturbance signal；
Step D, base is inputted by the input current signal of the obtained intermediate dc bus voltage signals of step A and inverter bridge leg
Quasi- generative circuit, obtains primary current reference signal and secondary current reference signal；
Step E, obtains auxiliary capacitor voltage disturbance signal by step B and adds the obtained primary current reference signals of step D,
Obtain primary current actual reference signal；
Step F, the obtained secondary currents of the intermediate dc bus voltage disturbance signal addition step D that step C is obtained are joined
Signal is examined, obtains secondary current actual reference signal；
Step G, by the primary current actual reference signal that step E is obtained and the actual reference of secondary current that step F is obtained
Signal inputs modulating wave generative circuit, obtains first, second, third modulation wave signal；
Step H, inputs pwm control circuit by foregoing first, second modulation wave signal, obtains first, second logic respectively
Signal；
Step I, the 3rd modulation wave signal that step G is obtained input zero-crossing comparator, obtain the 3rd logical signal；
Step J, by foregoing first logical signal input logic circuit, after first passing through logic inverter in logic circuits, then
By logic inverter, the control signal of primary side switch pipe is obtained；
Foregoing first, second, third logical signal is distinguished into input logic circuit, first, second is patrolled in logic circuits
Signal is collected after logic XOR gate, and the 3rd logical signal accesses logical AND gate together, obtains the control of the first auxiliary switch
Signal processed；
Foregoing first, second, third logical signal is distinguished into input logic circuit, first, second is patrolled in logic circuits
Collect signal and pass through logic XOR gate, the 3rd logical signal is another to play access logical AND gate after logic inverter, obtains second
The control signal of auxiliary switch；
Foregoing first, second, third logical signal is distinguished into input logic circuit, the first logic is believed in logic circuits
Number, the control signal of the control signal of the first auxiliary switch and the second auxiliary switch access logic nor gate together, obtain
The control signal of secondary-side switch pipe；
Step K, by the control signal of the obtained primary side switch pipes of step J, the control signal of the first auxiliary switch,
The control signal of two auxiliary switches and the control signal difference input driving circuit of secondary-side switch pipe, obtain primary side switch
The drive signal of the drive signal of pipe, the drive signal of secondary-side switch pipe and two auxiliary switches, controls the two-stage type inverse
Become device.
Technical characteristics of the present invention compared with original technology are, since secondary adds auxiliary winding, to pass through control
The shut-off of opening of auxiliary switch (9) is transferred to ripple on auxiliary capacitor (10), disappears so as to fulfill to input current ripple
Remove, and the function of traditional two-stage type inverter is also kept.
Brief description of the drawings
Attached drawing 1 is traditional two-stage type inverter circuit structure diagram.
Attached drawing 2 is the two-stage type converter main circuit and its control method of a kind of elimination input current ripple of the present invention
Structure diagram.
Attached drawing 3 be the present invention a kind of elimination input current ripple two-stage type inverter in isolating transformer it is equivalent after
Electrical block diagram.
Attached drawing 4 is a kind of two-stage type inverter key operation waveforms schematic diagram of elimination input current ripple of the present invention.
5~attached drawing of attached drawing 9 is a kind of each switch mode of the two-stage type inverter of elimination input current ripple of the present invention
Schematic diagram.
Attached drawing 10 is that the present invention is applied to input current, auxiliary capacitor voltage, secondary under output voltage 220V/50Hz occasions
The simulation waveform of electric current and intermediate dc bus voltage.
Attached drawing 11 is that the present invention is applied to intermediate dc bus voltage, inverter bridge leg under output voltage 220V/50Hz occasions
Input current and output voltage simulation waveform.
Primary symbols title in above-mentioned attached drawing：Vi, supply voltage.Ci, input capacitance.Sp、Ss、S1~S4、Sx1、Sx2、
Power switch pipe.Cdc, intermediate dc bus capacitance.Tr, isolating transformer.N1, isolating transformer primary side winding.N2, isolation become
Depressor vice-side winding.Lm, magnetizing inductance.Lf, filter inductance.Cf, filter capacitor.RL, load.Nx1、 Nx2Isolating transformer aids in
Winding.Cx, auxiliary capacitor.vx, auxiliary capacitor both end voltage.vdc, intermediate dc bus voltage.vo, inverter output voltage.
Embodiment
The technical solution of invention is described in detail below in conjunction with the accompanying drawings：
Shown in attached drawing 2 is a kind of knot for the two-stage type converter main circuit and its control method for eliminating input current ripple
Structure schematic diagram.By DC power supply Vi, it is input capacitance 1, primary side switch pipe 2, isolating transformer 3, secondary-side switch pipe 4, middle straight
5, two inverter bridge legs 6 and 7 of stream bus capacitor, filter circuit 8, auxiliary switch 9 and auxiliary capacitor 10 form.Sp、Ss、S1~
S4、Sx1、Sx2It is eight power switch pipes, CiIt is input capacitance, TrIt is isolating transformer, CxIt is auxiliary capacitor, CdcIt is middle straight
Flow bus capacitor, LfIt is output inductor, CfIt is output filter capacitor, RLFor load. vo, inverter output voltage.
Detect auxiliary capacitor voltage signal vx, intermediate dc bus voltage signal vdc, the input current signal of inverter bridge leg
iinv；By auxiliary capacitor voltage signal vxAuxiliary capacitor voltage control circuit is inputted, obtains auxiliary capacitor voltage disturbance signal；Will
Intermediate dc bus voltage signal vdcIntermediate dc bus voltage control circuit is inputted, obtains intermediate dc bus voltage disturbance
Signal；By intermediate dc bus voltage signal vdcWith the input current signal i of inverter bridge leginvInput reference generative circuit, is obtained
Obtain primary current reference signal I1-rWith secondary current reference signal i2-r；Auxiliary capacitor voltage disturbance signal is added into primary side electricity
Flow reference signal I1-r, obtain primary current actual reference signal I1-ref, intermediate dc bus voltage disturbance signal is added secondary
Side current reference signal i2-r, obtain secondary current actual reference signal i2-ref, by primary current actual reference signal I1-refWith
Secondary current actual reference signal i2-refModulating wave generative circuit is inputted, obtains the first modulation wave signal M1, the second modulating wave letter
Number M2With the 3rd modulation wave signal M3；By the first modulation wave signal M1With the second modulation wave signal M2PWM control electricity is inputted respectively
Road, obtains the first logical signal C1With the second logical signal C2；By the 3rd modulation wave signal M3Zero-crossing comparator is inputted, obtains the
Three logical signal C3；By the first logical signal C1Input logic circuit, after first passing through logic inverter in logic circuits, then passes through
Logic inverter, obtains the control signal Q of primary side switch pipep；By the first logical signal C1, the second logical signal C2With the 3rd logic
Signal C3Distinguish input logic circuit, in logic circuits the first logical signal C1With the second logical signal C2By logic exclusive or
Behind the door, and the 3rd logical signal C3Logical AND gate is accessed together, obtains the control signal Q of the first auxiliary switchx1；By first
Logical signal C1, the second logical signal C2With the 3rd logical signal C3Distinguish input logic circuit, in logic circuits the first logic
Signal C1With the second logical signal C2By logic XOR gate, the 3rd logical signal C3It is another to play access after logic inverter
Logical AND gate, obtains the control signal Q of the second auxiliary switchx2；By the first logical signal C1, the second logical signal C2With
Three logical signal C3Distinguish input logic circuit, in logic circuits the first logical signal C1, the first auxiliary switch control
Signal Qx1With the control signal Q of the second auxiliary switchx2Logic nor gate is accessed together, obtains the control letter of secondary-side switch pipe
Number Qs；By the control signal Q of primary side switch pipep, the control signal Q of the first auxiliary switchx1, the control of the second auxiliary switch
Signal Q processedx2And the control signal Q of secondary-side switch pipesInput driving circuit respectively, obtains the drive signal of primary side switch pipe
Sp, secondary-side switch pipe drive signal SsAnd the drive signal S of two auxiliary switchesx1/Sx2, control the two-stage type inversion
Device.
For easy analysis, below by taking the main circuit structure attached drawing 3 after attached drawing 2 is equivalent as an example, with reference to 4~attached drawing of attached drawing 9
Describe the concrete operating principle of the present invention.Understand that whole one switch periods of inverter there are 8 kinds of switch mode by attached drawing 4, respectively
It is [tI0-tI1]、[tI1-tI2]、[tI2-tI3]、[tI3-tI4]、[tII0-tII1]、[tII1-tII2]、[tII2-tII3]、[tII3-tII4],
Wherein, [tI0-tI4] be pattern I under a switch periods, [tII0-tII4] be pattern II under a switch periods.Below
The working condition of each switch mode is made a concrete analysis of.
Before analysis, first make the following assumptions：1. all switching tubes are ideal component；2. it is equivalent to ignore isolating transformer
Leakage inductance afterwards.
Below to respectively the working condition of switch mode is made a concrete analysis of under pattern I.
1. switch 1 [t of modeI0-tI1] [corresponding to attached drawing 5]
SpConducting, Ss、Sx1And Sx2Cut-off, input voltage ViIt is applied directly in isolating transformer primary side winding, primary current
i1Linear rise is to the actual reference value I of primary current1-ref。i1(t) it is represented by
Wherein, tI1Moment, i1(tI1)=I1-ref。
First modulation wave signal M1It is represented by：
Wherein, TsFor switch periods.
2. switch 2 [t of modeI1-tI2] [corresponding to attached drawing 6]
tI1Moment, SpShut-off, Sx1Conducting, isolating transformer give auxiliary capacitor CxCharging, auxiliary capacitor both end voltage vxInstead
To being added in the first auxiliary winding of isolating transformer, since this process time is extremely short, vxIt can be considered constant pressure source, thus flow through
The electric current i of auxiliary capacitorx1It is linear to decline.ix1(t) it is represented by
Wherein, n is the isolating transformer turn ratio, n=N2∶N1=Nx1∶N1=Nx2∶N1；tI2Moment, ix1(tI2)=i2-ref
(tI2)。
Second modulation wave signal M2It is represented by：
3rd modulation wave signal M3It is represented by：
M3=I1-ref-ni2-ref (5)
3. switch 3 [t of modeI2-tI3] [corresponding to attached drawing 8]
tI2Moment, Sx1Shut-off, SsConducting, intermediate dc bus voltage vdcReversely it is added on isolating transformer vice-side winding,
Flow through the electric current i of vice-side winding2From the actual reference value i of secondary current2-refDrop to zero.Intermediate dc bus capacitance CdcIt is considered as
Constant voltage source, then secondary current i2Linear change.During this, i2(t) relational expression is as follows：
Wherein, tI2Moment, i2(tI2)=ix1(tI2)；tI3Moment, i2(tI3)=0.
4. switch 4 [t of modeI3-tI4] [corresponding to attached drawing 9]
Secondary current i2After dropping to zero, secondary-side switch pipe SsDo not immediately turn off, but when next switch periods are opened
Just turned off when beginning.In the process, the primary side of isolating transformer, secondary and auxiliary winding all do not have electric current, transformer
Reset.Energy needed for load will be by middle directly bus capacitor CdcThere is provided.
Below to respectively the working condition of switch mode is made a concrete analysis of under pattern II.
1. switch 1 [t of modeII0-tII1] [corresponding to attached drawing 5]
This process is identical with the switch mode 1 under pattern I, and DC power supply transmits energy to transformer.Due to primary current
i1Peak value be constant I1-ref, and high fdrequency component will flow through input capacitance, so input current IiAlso it is a DC quantity.
2. switch 2 [t of modeII1-tII2] [corresponding to attached drawing 7]
Different from the switch mode 2 under pattern I, during this, Sx2Open rather than Sx1, auxiliary capacitor CxBecome to isolation
Depressor charges, auxiliary capacitor both end voltage vxForward direction is added in the second auxiliary winding of isolating transformer, thus flows through auxiliary electricity
The electric current i of appearancex2Linear rise.ix2(t) it is represented by
3. switch 3 [t of modeII2-tII3] [corresponding to attached drawing 8]
This process is similar with the switch mode 3 under pattern I, is stored in energy in isolating transformer to rear class transmission.
4. switch 4 [t of modeII3-tII4] [corresponding to attached drawing 9]
This process is consistent with the switch mode 4 under pattern I, and intermediate dc bus capacitance maintains the energy needed for load.
Figure 10 and Figure 11 is that the present invention is applied to simulation waveform under output voltage 220V/50Hz occasions.Can by simulation waveform
To find out, input current is DC quantity, and auxiliary capacitor voltage includes two frequency multiplication pulsating volage components, illustrates the two-stage type inversion
Pulsating power can be transferred in auxiliary circuit by device, so as to eliminate low frequency input current ripple well.
More than description it is known that it is proposed by the present invention it is a kind of eliminate input current ripple two-stage type inverter and
Its control method has the advantages that following several respects：
1) due to increasing auxiliary circuit, the low-frequency current ripple that inversion outlet side introduces is transferred on auxiliary capacitor, because
This inverter input terminal rely solely on very little capacitance filter out switching harmonics component can realize input current ripple eliminate
Purpose, and circuit control is simple.
2) capacitance in inverter can use the thin-film capacitor of low-capacitance, and the switching frequency of system is high, isolates transformation
Device is relatively small, therefore system bulk is small, service life length.
3) since primary side switch pipe is zero current turning-on, secondary-side switch pipe is zero-current switching, therefore switching loss is small, carries
High system effectiveness.
Claims (2)
1. a kind of two-stage type inverter for eliminating input current ripple, including DC power supply, input capacitance (1), primary side switch pipe
(2), identical the first inverter bridge leg (6) of isolating transformer (3), secondary-side switch pipe (4), intermediate dc bus capacitance (5), structure
With the second inverter bridge leg (7) and filter circuit (8), wherein the cathode of DC power supply connect respectively input capacitance (1) one end and
The primary side winding Same Name of Ends of isolating transformer (3), the anode of DC power supply connects the other end of input capacitance (1) respectively and primary side is opened
The emitter of pipe (2) is closed, the collector of primary side switch pipe (2) connects the primary side winding different name end of isolating transformer (3), secondary-side switch
The collector of pipe (4) connects the vice-side winding different name end of isolating transformer (3), the first inverter bridge leg (6) and the second inverter bridge leg (7)
All include two switching tubes, the collector of first switch pipe, the emitter and intermediate dc bus capacitance of secondary-side switch pipe (4)
(5) one end connects and composes the positive input terminal of inverter bridge leg, the emitter of second switch pipe, the secondary of isolating transformer (3) around
The other end of group Same Name of Ends and intermediate dc bus capacitance (5) connects and composes the negative input end of inverter bridge leg, first switch pipe
The collector of emitter and second switch pipe connects and composes the output terminal of inverter bridge leg, the output termination of the first inverter bridge leg (6)
To the anode of filter circuit (8), the output of the second inverter bridge leg (7) terminates to the negative terminal of filter circuit (8), it is characterised in that：
Further include the auxiliary being made of two auxiliary windings of isolating transformer (3), auxiliary switch (9) and auxiliary capacitor (10)
Circuit；Wherein auxiliary switch (9) includes two switching tubes, the auxiliary winding of isolating transformer (3) by the identical number of turn auxiliary
Winding Nx1、Nx2Composition, the collector of the first auxiliary switch meet the first auxiliary winding Nx1Different name end, the first auxiliary switch
One end respectively with the collector and auxiliary capacitor (10) of the second auxiliary switch of emitter be connected, the second auxiliary switch
Emitter meets the second auxiliary winding Nx2Same Name of Ends, the other end of auxiliary capacitor (10) meets the first auxiliary winding N respectivelyx1It is same
Name end and the second auxiliary winding Nx2Different name end.
2. a kind of two-stage type inverter for eliminating input current ripple as claimed in claim 1, wherein, the control of inverter bridge leg
Method is traditional single stage PWM modulation；It is characterized in that, the control method of the two-stage type inverter is further comprising the steps of：
Step A, detects auxiliary capacitor voltage signal, intermediate dc bus voltage signal, the input current signal of inverter bridge leg；
Step B, the auxiliary capacitor voltage signal that step A is obtained input auxiliary capacitor voltage control circuit, obtain auxiliary capacitor
Voltage disturbance signal；
Step C, the intermediate dc bus voltage signal that step A is obtained input intermediate dc bus voltage control circuit, obtain
Intermediate dc bus voltage disturbance signal；
Step D, the input current signal input reference of the obtained intermediate dc bus voltage signals of step A and inverter bridge leg is given birth to
Into circuit, primary current reference signal and secondary current reference signal are obtained；
Step E, obtains auxiliary capacitor voltage disturbance signal by step B and adds the obtained primary current reference signals of step D, obtain
Primary current actual reference signal；
Step F, the secondary current that the intermediate dc bus voltage disturbance signal addition step D that step C is obtained is obtained is with reference to letter
Number, obtain secondary current actual reference signal；
Step G, by the primary current actual reference signal that step E is obtained and the secondary current actual reference signal that step F is obtained
Modulating wave generative circuit is inputted, obtains first, second, third modulation wave signal；
Step H, inputs pwm control circuit by foregoing first, second modulation wave signal, obtains first, second logical signal respectively；
Step I, the 3rd modulation wave signal that step G is obtained input zero-crossing comparator, obtain the 3rd logical signal；
Step J, foregoing first logical signal input logic circuit after first passing through logic inverter in logic circuits, then passes through
Logic inverter, obtains the control signal of primary side switch pipe；
Foregoing first, second, third logical signal is distinguished into input logic circuit, first, second logic is believed in logic circuits
Number after logic XOR gate, and the 3rd logical signal accesses logical AND gate together, obtains the control letter of the first auxiliary switch
Number；
Foregoing first, second, third logical signal is distinguished into input logic circuit, first, second logic is believed in logic circuits
Number pass through logic XOR gate, the 3rd logical signal is another to play access logical AND gate after logic inverter, obtains the second auxiliary and opens
Close the control signal of pipe；
Foregoing first, second, third logical signal is distinguished into input logic circuit, in logic circuits the first logical signal, the
The control signal of one auxiliary switch and the control signal of the second auxiliary switch access logic nor gate together, obtain secondary and open
Close the control signal of pipe；
Step K, by the control signal of the obtained primary side switch pipes of step J, the control signal of the first auxiliary switch, the second auxiliary
The control signal of switching tube and the control signal difference input driving circuit of secondary-side switch pipe, obtain the driving of primary side switch pipe
The drive signal of signal, the drive signal of secondary-side switch pipe and two auxiliary switches, controls the two-stage type inverter.
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