CN107124105A - Improve isolated form three-level PFC converter PF control system and method - Google Patents

Improve isolated form three-level PFC converter PF control system and method Download PDF

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Publication number
CN107124105A
CN107124105A CN201710311410.1A CN201710311410A CN107124105A CN 107124105 A CN107124105 A CN 107124105A CN 201710311410 A CN201710311410 A CN 201710311410A CN 107124105 A CN107124105 A CN 107124105A
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level
converter
isolated form
diode
switching tube
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CN107124105B (en
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吕建国
李冬莹
胡文斌
陈岳贤
刘瑶秋
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Nanjing Hangxuan Rail Transit Technology Co ltd
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Nanjing University of Science and Technology
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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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
    • 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
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • 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
    • H02M1/4233—Arrangements for improving power factor of AC input using a bridge converter comprising active switches
    • 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
    • H02M1/4258—Arrangements for improving power factor of AC input using a single converter stage both for correction of AC input power factor and generation of a regulated and galvanically isolated DC output voltage
    • 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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • H02M3/33515—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with digital control
    • 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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00—Climate change mitigation technologies for sector-wide applications
    • Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Rectifiers (AREA)

Abstract

The invention discloses a kind of control system and method for improving isolated form three-level PFC converter PF.The system includes isolated form three-level PFC converter and digital process controller, wherein isolated form three-level PFC converter includes alternating current input power supplying, diode rectifier bridge, input inductance and half-bridge three-level direct current converter, alternating current input power supplying connects the input of diode rectifier bridge, and the output end of diode rectifier bridge accesses the input of half-bridge three-level direct current converter through inputting inductance；Wherein digital process controller includes ADC, data processing module and pwm pulse width modulation module；The output end of the pwm pulse width modulation module accesses the grid of each switching tube in isolated form three-level PFC converter through drive circuit.Three level isolated form pfc converter PF of raising proposed by the present invention control system and method, the input current waveform that can effectively control converter is pure sinusoid, and PF is improved to 1.

Description

Improve isolated form three-level PFC converter PF control system and method
Technical field
It is particularly a kind of to improve the level of isolated form three the invention belongs to the control technology field in Technics of Power Electronic Conversion technology Pfc converter PF control system and method.
Background technology
With the development of Power Electronic Technique, to Harmonics of Input in electrical energy changer and input power factor The requirement more and more higher of (Power Factor, PF), PFC (Power Factor Correction, PFC) conversion Device has obtained widely studied with applying.Pfc converter be broadly divided into it is active and passive two kinds, wherein active PFC have small volume, Lightweight, input power factor is high and the advantages of efficiency high.Divided with circuit structure, can be two-stage PFC by active PFC points Circuit and single- stage PFC circuit.Two-stage pfc circuit is generally by the power factor preconditioner and rear class DC/DC converter groups of prime Into wherein PFC grades is used to realize input current shaping, and rear class DC/DC converters realize isolation and voltage transformation regulatory function.Two Level PFC solution techniques are ripe, with excellent performances such as High Power Factor, high regulation precision and high reaction speeds, but at least need Two sets of control circuits are wanted, cost and complexity is added.Single- stage PFC circuit by PFC grades of converter and DC/DC grade of switching tube with Control circuit to share, have the advantages that simple in construction, cost is low and efficiency high, its circuit topological structure and control method become The study hotspot of current PFC technologies.
At present, the control mode of pfc converter is divided into simulation control and digital control.By years of researches and development, Analog control technique is highly developed, due to the simplicity and low cost of implementation of control method, includes power in field of power supplies In factor correcting circuit, the dominance market share is occupied.Increasingly it is impossible to meet current energy mark for the limitation of simulation control The accurate requirement in terms of efficiency, electromagnetic interference (EMI), and existing digital control often have that method is complicated, be difficult to realize The problem of.
The content of the invention
It is an object of the invention to provide a kind of control method it is simple, be easy to the level of raising isolated form three of Digital Implementation Pfc converter PF control system and method, effective control input current waveform sineization improves converter PF.
The technical solution for realizing the object of the invention is：A kind of control for improving isolated form three-level PFC converter PF System, including isolated form three-level PFC converter and digital process controller, wherein：
The isolated form three-level PFC converter includes alternating current input power supplying vin, diode rectifier bridge RB, input inductance Li And half-bridge three-level direct current converter, wherein alternating current input power supplying vinDiode rectifier bridge RB input is connected, diode is whole Flow bridge RB positive output end connection input inductance Li, diode rectifier circuit RB negative output terminal is refers to zero-potential point, with half The input of bridge three-level DC converter is connected, and the voltage at diode rectifier bridge RB two ends is commutating voltage Vg；
The digital process controller includes：ADC, data processing module and pwm pulse width modulation module, every The rectified voltage signal V at diode rectifier bridge RB two ends in individual switch periodsg, the dc bus of half-bridge three-level direct current converter Voltage signal VdcWith output voltage signal Vo, sampled modulate circuit delivers to the ADC of digital process controller, ADC Each voltage signal deliver to the data processing module of digital process controller, by data processing module after analog-to-digital conversion The duty cycle control signal of each switching tube is obtained after computing and judgement, the duty cycle control signal of each switching tube is through digital processing control The pwm pulse width modulation module output of device processed, each switching tube in isolated form three-level PFC converter is connected to through drive circuit Grid.
Further, the half-bridge three-level direct current converter includes：First switch pipe Q1And the first diode D1, second Switching tube Q2And the second diode D2, the 3rd switching tube Q3And the 3rd diode D3, the 4th switching tube Q4And the 4th diode D4, the One clamp diode D5, the second clamp diode D6, the first dc-link capacitance Cdc1, the second dc-link capacitance Cdc2, high frequency change Depressor T, the first commutation diode D7, the second commutation diode D8, output inductor Lo, output filter capacitor Co, load Ro；Its Middle input inductance LiOne end be connected with diode rectifier bridge RB positive output end, input inductance LinThe other end and first switch Pipe Q1Source electrode, second switch pipe Q2Drain electrode and the first clamp diode D5Negative electrode be connected, the first diode D1With the two or two Pole pipe D2Inverse parallel is in first switch pipe Q respectively1With second switch pipe Q2Two ends, first switch pipe Q1Drain electrode and first straight Flow bus capacitor Cdc1Anode be connected, the first dc-link capacitance Cdc1Negative electrode and the first clamp diode D5Anode, height Frequency power transformer T primary side windings N1Same Name of Ends, the second dc-link capacitance Cdc2Anode and the second clamp diode D6Negative electrode It is connected, high frequency transformer T primary side windings N1Non-same polarity and second switch pipe Q2Source electrode and the 3rd switching tube Q3Drain electrode phase Even, the 3rd switching tube Q3Source electrode and the 4th switching tube Q4Drain electrode, the second clamp diode D6Anode and diode rectifier bridge RB negative output terminal is connected, the 3rd diode D3With the 4th diode D4Inverse parallel is in the 3rd switching tube Q respectively3With the 4th switch Pipe Q4Two ends, the 4th power switch pipe Q4Source electrode and the second dc-link capacitance Cdc2Negative electrode be connected, high frequency transformer T's First vice-side winding N2Same Name of Ends and the first commutation diode D7Anode be connected, high frequency transformer T the first vice-side winding N2 Non-same polarity and high frequency transformer T the second vice-side winding N3Same Name of Ends, output filter capacitor CoNegative electrode and load Ro's One end is connected, output filter capacitor CoAnode with load RoThe other end and output inductor LoOne end be connected, output filter Ripple inductance LoThe other end and the first commutation diode D7Negative electrode and the second commutation diode D8Negative electrode connection, the second rectification Diode D8Anode and high frequency transformer T the second vice-side winding N3Non-same polarity connection, half-bridge three-level direct current converter In the first dc-link capacitance Cdc1With the second dc-link capacitance Cdc2The voltage at two ends and for DC bus-bar voltage Vdc, load Ro The voltage at two ends is output voltage Vo。
Further, inductance L is inputted in the isolated form three-level PFC converteriWith half-bridge three-level direct current converter Middle first switch pipe Q1Source electrode and second switch pipe Q2Drain electrode is connected, and diode rectifier bridge RB negative output terminal is to refer to zero potential Point and the 3rd switching tube Q in half-bridge three-level direct current converter3Source electrode and the 4th switching tube Q4Drain electrode is connected.
Further, the digital process controller uses dsp chip TMS320F28335.
A kind of control method for improving isolated form three-level PFC converter PF, implements and comprises the following steps：
Step 1, in each switch periods, over-sampling modulate circuit is sampled two in isolated form three-level PFC converter respectively The rectified voltage signal V at pole pipe rectifier bridge RB two endsg, the DC bus-bar voltage signal V of half-bridge three-level direct current converterdcWith it is defeated Go out voltage signal Vo, the voltage analog signal of sampling is nursed one's health to meeting after the simulation input requirement of digital process controller, sent Enter the ADC of digital process controller；
Step 2, the ADC of digital process controller changes the voltage analog signal after conditioning of being sampled in step 1 After data signal, the data processing module of digital process controller is delivered to；
Step 3, the data processing module of digital process controller to through step 1 sample and step 2 analog-to-digital conversion after two The rectified voltage signal V at pole pipe rectifier bridge RB two endsg, the DC bus-bar voltage signal V of isolated form three-level DC converterdcWith Output voltage signal VoComputing and judgement are carried out, each switching tube Duty ratio control letter in isolated form three-level PFC converter is obtained Number；
Step 4, pwm pulse width modulation module of each switching tube duty cycle control signal through digital process controller is defeated Go out, PWM pulse-width modulation control signals are distributed to each switching tube in isolated form three-level PFC converter through drive circuit, control The normal work of isolated form three-level PFC converter difference switch mode processed, while realizing the PFC functions and output electricity of converter Press regulatory function.
Further, the data processing module of digital process controller described in step 3 through step 1 to sampling and step 2 The rectified voltage signal V at the diode rectifier bridge RB two ends after analog-to-digital conversiong, the dc bus of half-bridge three-level direct current converter Voltage signal VdcWith output voltage signal VoComputing and judgement are carried out, each switching tube in isolated form three-level PFC converter is obtained Duty cycle control signal, it is specific as follows：
d1+d2≤0.5
In formula：d1For second switch pipe Q in isolated form three-level PFC converter2With the 3rd switching tube Q3Common ON time Half account for the dutycycles of whole switch periods, i.e. PFC grades of dutycycles of isolated form three-level PFC converter；d2For isolated form three First switch pipe Q in level PFC converter1With the 4th switching tube Q4Conducting dutycycle, i.e. isolated form three-level PFC converter DC/DC grades of dutycycles；ω is the angular frequency of AC-input voltage, and the frequency of AC-input voltage is power frequency 50Hz, LiFor input Inductance inductance value, fsFor the switching frequency of each switching tube in isolated form three-level PFC converter, PoConverted for isolated form three-level PFC The power output of device, VgFor the commutating voltage at diode rectifier bridge RB two ends, VdcAnd VoRespectively half-bridge three-level DC converting The DC bus-bar voltage and output voltage of device, N are high frequency transformer T former secondary turn ratio.
Compared with prior art, its remarkable advantage is the present invention：(1) control method is simple, and real-time is good, and dynamic is rung Should be fast.When the condition of work such as load changing or chugging changes, digital process controller can be to the various of real-time sampling Voltage signal carries out quick, highdensity digital operation, is adjusted in converter and is respectively opened in real time according to the working condition of current system Close the conducting dutycycle of pipe；(2) control method can be in 90Vrms~265VrmsTotal head input range in, effectively control defeated Enter current waveform for pure sinusoid, reduce Harmonics of Input, the PF of converter is improved to 1；(3) isolation in the control system Type three-level PFC converter is a kind of Single Stage PFC Converter, and the voltage that switching tube is reduced using three-level topology structure should Power, it is 2 times of power switch pipe switching frequency to improve inductive current ripple frequency, further reduces the body of input and outputting inductance Product, effectively reduces the system loss of converter, improves the efficiency of converter.
Brief description of the drawings
Fig. 1 is the main circuit diagram of isolated form three-level PFC converter.
Fig. 2 is isolated form three-level PFC converter each switch mode equivalent circuit diagram in a switch periods, wherein (a)~(f) is that isolated form three-level PFC converter switchs the equivalent of mode 1~switch mode 6 in a switch periods respectively Circuit diagram.
Fig. 3 is the main oscillogram of isolated form three-level PFC converter under different switch mode in a switch periods.
Fig. 4 is the oscillogram of input current perunit value in half of power frequency period.
Fig. 5 is PF values and Vm/VdcGraph of relation.
Fig. 6 is the dutycycle oscillogram of control input current sinusoidal.
Fig. 7 is the flow chart that the present invention improves isolated form three-level PFC converter PF control methods.
Fig. 8 is the structure chart that the present invention improves isolated form three-level PFC converter PF control systems.
Embodiment
Below in conjunction with the accompanying drawings and specific embodiment makes further description to the present invention.
1. operation principle of the PFC level works of isolated form three-level PFC converter when discontinuous mode
The isolated form three-level PFC inverter main circuit of the present invention is as shown in figure 1, wherein have input current shaping function PFC levels and output voltage regulatory function DC/DC level common switch pipes Q2And Q3, therefore it is that a kind of typical single- stage PFC becomes Parallel operation.When the switching frequency of switching tube is constant, the converter PFC level works under constant conduction Duty ratio control are disconnected in inductive current During Discontinuous Conduction mode (Discontinue Current Mode, DCM), inductive current peak is substantially proportional to input voltage, i.e., defeated Enter electric current from motion tracking input voltage waveform, converter has automatic PFC functions.Now, switching tube Q2And Q3Opened for zero current It is logical, switching tube Q1And Q4It is open-minded for no-voltage, switching loss is effectively reduced, transducer effciency is improved.
With reference to Fig. 2 a-2f, difference of the isolated form three-level PFC converter in switch periods during analysis DCM Switch mode.
For convenience of analyzing, first make the following assumptions：
1) all devices are ideal element；
2) output voltage ripple very little compared with its DC quantity；
3) switching frequency is far above input voltage frequency.
Switch [the t of mode 10<t<t1]：Shown in equivalent circuit such as Fig. 2 (a), switching tube Q1And Q2Simultaneously turn on, the first direct current Bus capacitor Cdc1To high frequency transformer T primary side windings N1Electric discharge, primary voltage of transformer VTN1For-Vdc/ 2, direction is under upper bears Just, primary side winding electric current linearly increases.High frequency transformer T the second windings of secondary N3Voltage for it is upper it is negative under just, the second rectification two Pole pipe D8Forward conduction, outputting inductance LoVoltage V on charging, inductanceLo=Vdc/ 2N-Vo, output current linearly increases.
Switch [the t of mode 21<t<t2]：Shown in equivalent circuit such as Fig. 2 (b), switching tube Q2And Q3Simultaneously turn on, exchange input Voltage vinAfter diode rectifier bridge RB rectifications, commutating voltage VgTo input inductance LiCharging, inductive current linearly increases, energy It is stored in input inductance.Now high frequency transformer T primary side windings N1Voltage VTN1For 0, the first clamp diode D5Become for high frequency Depressor T primary current afterflow provides path.Outputting inductance LoTo output filter capacitor CoWith load RLElectric discharge, the second rectification two Pole pipe D8Now play fly-wheel diode.
Switch [the t of mode 32<t<t3]：Shown in equivalent circuit such as Fig. 2 (c), switching tube Q3And Q4Simultaneously turn on, be stored in defeated Enter inductance LiIn energy through switching tube Q1Anti-paralleled diode D1To two dc-link capacitance Cdc1And Cdc2Charged, Input inductive drop VLi=Vi- Vdc, inductive current linearly reduces.Meanwhile, output current is from the second commutation diode D8The change of current is arrived First commutation diode D7.Work as t=t3When, the energy inputted in inductive current is completely transferred in dc-link capacitance, input electricity Inducing current is reduced to zero.
Switch [the t of mode 43<t<t4]：Shown in equivalent circuit such as 2 figures (d), switching tube Q3And Q4Simultaneously turn on, the second direct current Bus capacitor Cdc2To high frequency transformer T primary side windings N1Electric discharge, primary voltage of transformer VTN1For Vdc/ 2, direction for it is upper just under Negative, primary side winding electric current linearly increases.High frequency transformer T the first windings of secondary N2Voltage be upper just lower negative, the first rectification two Pole pipe D7Forward conduction, outputting inductance LoVoltage V on charging, inductanceLo=Vdc/ 2N-Vo, output current linearly increases.Now, Input inductive current is still equal to zero, is discontinuous mode.
Switch [the t of mode 54<t<t5]：Shown in equivalent circuit such as Fig. 2 (e), switching tube Q2And Q3Simultaneously turn on, exchange input Voltage vinAfter diode rectifier bridge RB rectifications, commutating voltage VgTo input inductance LiCharging, inductive current linearly increases, energy It is stored in input inductance.Now high frequency transformer T primary side windings N1Voltage VTN1For 0, the second clamp diode D6Become for high frequency Depressor T primary current afterflow provides path.Outputting inductance LoTo output filter capacitor CoWith load RLElectric discharge, the second rectification two Pole pipe D7Now play fly-wheel diode.
Switch [the t of mode 65<t<t6]：Shown in equivalent circuit such as Fig. 2 (f), switching tube Q1And Q2Simultaneously turn on, now circuit The similar switch mode 3 of operational mode, is stored in input inductance LiIn energy through switching tube Q1Anti-paralleled diode D1To two Dc-link capacitance Cdc1And Cdc2Charged, input inductive drop VLi=Vi- Vdc, inductive current linearly reduces.Meanwhile, it is defeated Go out electric current from the first commutation diode D7The change of current is to the second commutation diode D8.Work as t=t6When, the energy inputted in inductive current It is completely transferred in dc-link capacitance, input inductive current is reduced to zero.
In a switch periods, the main waveform of the isolated form three-level PFC converter of different switch mode is worked in As shown in Figure 3.
Assuming that AC-input voltage vin(t) it is pure sinusoid, its expression formula is：
vin(t)=Vmsin(ωt) (1)
Wherein VmIt is the amplitude of AC-input voltage, ω is the angular frequency of input ac voltage.
So, AC-input voltage vin(t) commutating voltage obtained after diode rectifier bridge RB rectifications is：
Vg=Vm|sin(ωt)| (2)
In a switch periods, the peak value of inductive current is：
Wherein d1Representation switch pipe Q2And Q3The dutycycle that the half of common ON time accounts for whole switch periods (is isolated PFC grades of dutycycles of type three-level PFC converter), LiFor input inductance inductance value, TsFor the switch periods of switching tube.
In each switch periods, inductance L is inputtediThe volt-seconds area at two ends is equal, i.e.,：
V in formuladcFor the DC bus-bar voltage of half-bridge three-level direct current converter, drIt is right that zero is reduced to for input inductive current The dutycycle answered.
Obtained by formula (3) and formula (4), average value of the input inductive current in a switch periods：
So, input current is：
F in formulasFor the switching frequency of switching tube.
For ease of analyzing the shape of input current, input current can be subjected to standardization, its a reference value is Vmd1 2/Lifs.Root The input current expression formula after standardization can be obtained according to formula (6) is：
When different input voltage amplitudes can be drawn with DC bus-bar voltage ratio according to formula (7), in half of power frequency period The waveform of input current perunit value, as shown in Figure 4.It can be seen that the shape of input current waveform and Vm/VdcHave Close, Vm/VdcSmaller, input current is closer to sine.
The average value P of converter input power in half of power frequency period can be tried to achieve by formula (1) and formula (6)inFor：
T in formulalineFor the AC-input voltage cycle.
Assuming that transducer effciency is 100%, then input power is equal to power output, i.e. Pin=Po, must can be accounted for by formula (8) Sky compares d1For：
By formula (6) and formula (8) can in the hope of PF values expression formula：
PF values and V are made according to formula (9)m/VdcRelation curve, as shown in Figure 5.It can be seen that PF and input Voltage magnitude VmWith DC bus-bar voltage VdcRatio it is relevant, Vm/VdcSmaller, PF is bigger.In 90Vrms~265VrmsInput electricity In the range of pressure, as input voltage amplitude VmOne timing, it is possible to use topological structure improves DC bus-bar voltage Vdc, to increase conversion Device PF.
When outputting inductance current waveform consecutive hours, half-bridge three-level direct current converter DC bus-bar voltage and output voltage it Between relation be：
Wherein d2Representation switch pipe Q1And Q4ON time accounts for dutycycle (the i.e. isolated form three-level PFC of whole switch periods DC/DC grades of dutycycles of converter), N is the former secondary turn ratio of half-bridge three-level direct current converter medium/high frequency transformer, when control half The DC bus-bar voltage V of bridge three-level DC converterdcWith output voltage VoDuring for steady state value, d2Calculated value is constant.
To make isolated form three-level PFC converter normal work, the dutycycle d of PFC grades of converter is controlled1Converted with control The dutycycle d of DC/DC grades of device2Between restriction relation be：
d1+d2≤0.5 (12)
It can be seen from Fig. 4 and Fig. 5, the input current waveform and PF values of isolated form three-level PFC converter are electric with input The ratio V of pressure amplitude value and DC bus-bar voltagem/VdcIt is relevant, Vm/VdcSmaller, then input current waveform is closer to sine, converter PF is closer to 1.When input voltage is certain, by improving converter DC bus-bar voltage VdcVoltage class increase during PF, The voltage stress of switching tube in converter can be increased, increase system loss, transducer effciency is reduced, while being the device of switching tube Type selecting brings great difficulty, increases cost.Therefore, the present invention starts with from the analysis to input current waveform, defeated by controlling Enter current waveform for pure sinusoid, improve the PF to 1 of converter.
2. the derivation and realization of control input current sinusoidal method
When input current is sine wave in a power frequency period, with input voltage same-phase, make converter PF=1. Observation type (6), it will be assumed that the input current of pure sine wave is：
Wherein d0The dutycycle of PFC grades of converter during for input current waveform pure sinusoid.
Contrast actually enters current expression, and the relation that can be obtained between dutycycle is：
The input power that can be derived from converter by formula (1) and formula (13) is：
D as available from the above equation0For：
Bring formula (16) into formula (14), convolution (12), the dutycycle that can obtain control input current sinusoidal is：
The dutycycle d of PFC grades of isolated form three-level PFC converter is obtained by above formula1Waveform, as shown in Figure 6.When control becomes When PFC grades of dutycycles of parallel operation change according to above formula rule, the input current waveform of isolated form three-level PFC converter is pure String, with input voltage same-phase, can make the PF=1 of converter, as unity power factor.
Now, dutycycle of each switching tube in a switch periods is respectively in isolated form three-level PFC converter：
DS1=DS4=d2 (18)
DS2=DS3=2d1+d2 (19)
The flow chart proposed by the present invention for improving isolated form three-level PFC converter PF control methods is as shown in fig. 7, specific Implementation process is as follows：
(1) the commutating voltage V in isolated form three-level PFC converterg, DC bus-bar voltage VdcWith output voltage signal Vo The ADC of digital process controller is delivered to by over-sampling modulate circuit；
(2) ADC is converted to the voltage analog signal that sampling is got in (1) after data signal, delivers to data processing Module；
(3) data processing module utilizes voltage signal Vg,VdcAnd VoComputing and judgement are carried out, dutycycle d is obtained1And d2Send To pwm pulse width modulation module；
(4) pwm pulse width modulation module determines and exports the pwm control signal of each switching tube, through drive circuit control Each switching tube in isolated form three-level PFC converter, makes converter normal work.
3. the present invention improves isolated form three-level PFC converter PF control system and method
With reference to Fig. 8, the present invention improves isolated form three-level PFC converter PF control system, including the level of isolated form three Pfc converter 1 and digital process controller 2, wherein：
The isolated form three-level PFC converter 1 includes alternating current input power supplying vin, diode rectifier bridge RB, input inductance LiAnd half-bridge three-level direct current converter, wherein alternating current input power supplying vinConnect diode rectifier bridge RB input, diode Rectifier bridge RB positive output end connection input inductance Li, diode rectifier circuit RB negative output terminal is to refer to zero-potential point, with The input of half-bridge three-level direct current converter is connected, and the voltage at diode rectifier bridge RB two ends is commutating voltage Vg；
The digital process controller 2 includes：ADC, data processing module and pwm pulse width modulation module, The rectified voltage signal V at diode rectifier bridge RB two ends in each switch periodsg, the direct current mother of half-bridge three-level direct current converter Line voltage signal VdcWith output voltage signal Vo, sampled modulate circuit delivers to the ADC of digital process controller 2, ADC moulds Each voltage signal deliver to the data processing module of digital process controller 2 after analog-to-digital conversion by block, by data processing mould Obtain the duty cycle control signal of each switching tube after the computing and judgement of block, the duty cycle control signal of each switching tube through numeral at The pwm pulse width modulation module output of controller 2 is managed, is connected in isolated form three-level PFC converter 1 and respectively opens through drive circuit Close the grid of pipe.
Further, the half-bridge three-level direct current converter includes：First switch pipe Q1And the first diode D1, second Switching tube Q2And the second diode D2, the 3rd switching tube Q3And the 3rd diode D3, the 4th switching tube Q4And the 4th diode D4, the One clamp diode D5, the second clamp diode D6, the first dc-link capacitance Cdc1, the second dc-link capacitance Cdc2, high frequency change Depressor T, the first commutation diode D7, the second commutation diode D8, output inductor Lo, output filter capacitor Co, load Ro；Its Middle input inductance LiOne end be connected with diode rectifier bridge RB positive output end, input inductance LinThe other end and first switch Pipe Q1Source electrode, second switch pipe Q2Drain electrode and the first clamp diode D5Negative electrode be connected, the first diode D1With the two or two Pole pipe D2Inverse parallel is in first switch pipe Q respectively1With second switch pipe Q2Two ends, first switch pipe Q1Drain electrode and first straight Flow bus capacitor Cdc1Anode be connected, the first dc-link capacitance Cdc1Negative electrode and the first clamp diode D5Anode, height Frequency power transformer T primary side windings N1Same Name of Ends, the second dc-link capacitance Cdc2Anode and the second clamp diode D6Negative electrode It is connected, high frequency transformer T primary side windings N1Non-same polarity and second switch pipe Q2Source electrode and the 3rd switching tube Q3Drain electrode phase Even, the 3rd switching tube Q3Source electrode and the 4th switching tube Q4Drain electrode, the second clamp diode D6Anode and diode rectifier bridge RB negative output terminal is connected, the 3rd diode D3With the 4th diode D4Inverse parallel is in the 3rd switching tube Q respectively3With the 4th switch Pipe Q4Two ends, the 4th power switch pipe Q4Source electrode and the second dc-link capacitance Cdc2Negative electrode be connected, high frequency transformer T's First vice-side winding N2Same Name of Ends and the first commutation diode D7Anode be connected, high frequency transformer T the first vice-side winding N2 Non-same polarity and high frequency transformer T the second vice-side winding N3Same Name of Ends, output filter capacitor CoNegative electrode and load Ro's One end is connected, output filter capacitor CoAnode with load RoThe other end and output inductor LoOne end be connected, output filter Ripple inductance LoThe other end and the first commutation diode D7Negative electrode and the second commutation diode D8Negative electrode connection, the second rectification Diode D8Anode and high frequency transformer T the second vice-side winding N3Non-same polarity connection, half-bridge three-level direct current converter In the first dc-link capacitance Cdc1With the second dc-link capacitance Cdc2The voltage at two ends and for DC bus-bar voltage Vdc, load Ro The voltage at two ends is output voltage Vo。
Further, inductance L is inputted in the isolated form three-level PFC converter 1iWith half-bridge three-level direct current converter Middle first switch pipe Q1Source electrode and second switch pipe Q2Drain electrode is connected, and diode rectifier bridge RB negative output terminal is to refer to zero potential Point and the 3rd switching tube Q in half-bridge three-level direct current converter3Source electrode and the 4th switching tube Q4Drain electrode is connected.
Further, the digital process controller 2 is using dsp chip TMS320F28335.
A kind of control method for improving isolated form three-level PFC converter PF, implements and comprises the following steps：
Step 1, in each switch periods, over-sampling modulate circuit is sampled two in isolated form three-level PFC converter 1 respectively The rectified voltage signal V at pole pipe rectifier bridge RB two endsg, the DC bus-bar voltage signal V of half-bridge three-level direct current converterdcWith it is defeated Go out voltage signal Vo, the voltage analog signal of sampling is nursed one's health to meeting after the simulation input requirement of digital process controller 2, sent Enter the ADC of digital process controller 2；
Step 2, the ADC of digital process controller 2 changes the voltage analog signal after conditioning of being sampled in step 1 After data signal, the data processing module of digital process controller 2 is delivered to；
Step 3, the data processing module of digital process controller 2 to through step 1 sample and step 2 analog-to-digital conversion after two The rectified voltage signal V at pole pipe rectifier bridge RB two endsg, the DC bus-bar voltage signal V of isolated form three-level DC converterdcWith Output voltage signal VoComputing and judgement are carried out, each switching tube Duty ratio control letter in isolated form three-level PFC converter 1 is obtained Number；
Step 4, pwm pulse width modulation module of each switching tube duty cycle control signal through digital process controller 2 is defeated Go out, PWM pulse-width modulation control signals are distributed to each switching tube in isolated form three-level PFC converter 1 through drive circuit, control The normal work of the difference of isolated form three-level PFC converter 1 switch mode processed, while realizing PFC functions and the output of converter Voltage-regulation function.
Further, the data processing module of digital process controller 2 described in step 3 through step 1 to sampling and step 2 The rectified voltage signal V at the diode rectifier bridge RB two ends after analog-to-digital conversiong, the dc bus of half-bridge three-level direct current converter Voltage signal VdcWith output voltage signal VoComputing and judgement are carried out, each switching tube in isolated form three-level PFC converter 1 is obtained Duty cycle control signal, it is specific as follows：
d1+d2≤0.5
In formula：d1For second switch pipe Q in isolated form three-level PFC converter 12With the 3rd switching tube Q3During common conducting Between half account for the dutycycles of whole switch periods, i.e. PFC grades of dutycycles of isolated form three-level PFC converter；d2For isolated form First switch pipe Q in three-level PFC converter 11With the 4th switching tube Q4Conducting dutycycle, i.e., isolated form three-level PFC convert DC/DC grades of dutycycles of device；ω is the angular frequency of AC-input voltage, and the frequency of AC-input voltage is power frequency 50Hz, LiTo be defeated Enter inductance inductance value, fsFor the switching frequency of each switching tube in isolated form three-level PFC converter 1, PoFor isolated form three-level PFC The power output of converter 1, VgFor the commutating voltage at diode rectifier bridge RB two ends, VdcAnd VoRespectively half-bridge three-level direct current The DC bus-bar voltage and output voltage of converter, N are high frequency transformer T former secondary turn ratio.
In summary, the invention discloses a kind of control system and method for improving isolated form three-level PFC converter PF, Various voltage signals in each switch periods needed for real-time sample control, are carried out quick, high using digital process controller The digital operation of density, obtains the control duty that isolated form three-level PFC converter input current waveform can be made to be pure sinusoid Than.The control method has real-time good, and dynamic response is fast, is easy to the advantage of Digital Realization；The control system can be effective The system loss of converter is reduced, the efficiency of converter is improved, can be in 90Vrms~265VrmsTotal head input range in, have Control input current waveform sineization is imitated, converter PF to 1 is improved.

Claims (6)

1. a kind of control system for improving isolated form three-level PFC converter PF, it is characterised in that including the level of isolated form three Pfc converter (1) and digital process controller (2), wherein：
The isolated form three-level PFC converter (1) includes alternating current input power supplying vin, diode rectifier bridge RB, input inductance Li And half-bridge three-level direct current converter, wherein alternating current input power supplying vinDiode rectifier bridge RB input is connected, diode is whole Flow bridge RB positive output end connection input inductance Li, diode rectifier circuit RB negative output terminal is refers to zero-potential point, with half The input of bridge three-level DC converter is connected, and the voltage at diode rectifier bridge RB two ends is commutating voltage Vg；
The digital process controller (2) includes：ADC, data processing module and pwm pulse width modulation module, every The rectified voltage signal V at diode rectifier bridge RB two ends in individual switch periodsg, the direct current mother of isolated form three-level DC converter Line voltage signal VdcWith output voltage signal Vo, sampled modulate circuit delivers to the ADC of digital process controller (2), ADC Each voltage signal deliver to the data processing module of digital process controller (2) after analog-to-digital conversion by module, at data The duty cycle control signal of each switching tube is obtained after the computing and judgement of managing module, the duty cycle control signal of each switching tube is through number The pwm pulse width modulation module output of word processing controller (2), isolated form three-level PFC converter is connected to through drive circuit (1) grid of each switching tube in.
2. the control system according to claim 1 for improving isolated form three-level PFC converter PF, it is characterised in that institute Stating half-bridge three-level direct current converter includes：First switch pipe Q1And the first diode D1, second switch pipe Q2And second diode D2, the 3rd switching tube Q3And the 3rd diode D3, the 4th switching tube Q4And the 4th diode D4, the first clamp diode D5, second Clamp diode D6, the first dc-link capacitance Cdc1, the second dc-link capacitance Cdc2, high frequency transformer T, the pole of the first rectification two Pipe D7, the second commutation diode D8, output inductor Lo, output filter capacitor Co, load Ro；Wherein input inductance LiOne end It is connected with diode rectifier bridge RB positive output end, input inductance LinThe other end and first switch pipe Q1Source electrode, second open Close pipe Q2Drain electrode and the first clamp diode D5Negative electrode be connected, the first diode D1With the second diode D2Inverse parallel respectively In first switch pipe Q1With second switch pipe Q2Two ends, first switch pipe Q1Drain electrode and the first dc-link capacitance Cdc1Sun Extremely it is connected, the first dc-link capacitance Cdc1Negative electrode and the first clamp diode D5Anode, high frequency transformer T primary side windings N1 Same Name of Ends, the second dc-link capacitance Cdc2Anode and the second clamp diode D6Negative electrode be connected, high frequency transformer T is former Side winding N1Non-same polarity and second switch pipe Q2Source electrode and the 3rd switching tube Q3Drain electrode be connected, the 3rd switching tube Q3's Source electrode and the 4th switching tube Q4Drain electrode, the second clamp diode D6Anode be connected with diode rectifier bridge RB negative output terminal, 3rd diode D3With the 4th diode D4Inverse parallel is in the 3rd switching tube Q respectively3With the 4th switching tube Q4Two ends, the 4th work( Rate switching tube Q4Source electrode and the second dc-link capacitance Cdc2Negative electrode be connected, high frequency transformer T the first vice-side winding N2's Same Name of Ends and the first commutation diode D7Anode be connected, high frequency transformer T the first vice-side winding N2Non-same polarity and high frequency Transformer T the second vice-side winding N3Same Name of Ends, output filter capacitor CoNegative electrode and load RoOne end be connected, output filter Ripple electric capacity CoAnode with load RoThe other end and output inductor LoOne end be connected, output inductor LoIt is another End and the first commutation diode D7Negative electrode and the second commutation diode D8Negative electrode connection, the second commutation diode D8Anode With high frequency transformer T the second vice-side winding N3Non-same polarity connection, the first direct current is female in half-bridge three-level direct current converter Line capacitance Cdc1With the second dc-link capacitance Cdc2The voltage at two ends and for DC bus-bar voltage Vdc, load RoThe voltage at two ends is Output voltage Vo。
3. the control system according to claim 2 for improving isolated form three-level PFC converter PF, it is characterised in that institute State input inductance L in isolated form three-level PFC converter (1)iWith first switch pipe Q in half-bridge three-level direct current converter1Source electrode With second switch pipe Q2Drain electrode is connected, and diode rectifier bridge RB negative output terminal is i.e. with reference to zero-potential point and half-bridge three-level direct current 3rd switching tube Q in converter3Source electrode and the 4th switching tube Q4Drain electrode is connected.
4. the control system according to claim 1 or 2 for improving isolated form three-level PFC converter PF, it is characterised in that The digital process controller (2) is using dsp chip TMS320F28335.
5. a kind of control method for improving isolated form three-level PFC converter PF, it is characterised in that implement including following step Suddenly：
Step 1, in each switch periods, over-sampling modulate circuit is sampled two poles in isolated form three-level PFC converter (1) respectively The rectified voltage signal V at pipe rectifier bridge RB two endsg, the DC bus-bar voltage signal V of half-bridge three-level direct current converterdcAnd output Voltage signal Vo, the voltage analog signal of sampling is nursed one's health to meeting after the simulation input requirement of digital process controller (2), sent Enter the ADC of digital process controller (2)；
Step 2, the ADC of digital process controller (2) is converted to the voltage analog signal after conditioning of being sampled in step 1 After data signal, the data processing module of digital process controller (2) is delivered to；
Step 3, the data processing module of digital process controller (2) to through step 1 sample and step 2 analog-to-digital conversion after two poles The rectified voltage signal V at pipe rectifier bridge RB two endsg, the DC bus-bar voltage signal V of half-bridge three-level direct current converterdcAnd output Voltage signal VoComputing and judgement are carried out, each switching tube Duty ratio control letter in isolated form three-level PFC converter (1) is obtained Number；
Step 4, pwm pulse width modulation module output of each switching tube duty cycle control signal through digital process controller (2), PWM pulse-width modulation control signals are distributed to each switching tube in isolated form three-level PFC converter (1) through drive circuit, controlled The normal work of isolated form three-level PFC converter (1) processed difference switch mode, while realizing the PFC functions of converter and defeated Go out voltage-regulation function.
6. the control method according to claim 5 for improving isolated form three-level PFC converter PF, it is characterised in that step The data processing module of digital process controller (2) described in rapid 3 to through step 1 sample and step 2 analog-to-digital conversion after two poles The rectified voltage signal V at pipe rectifier bridge RB two endsg, the DC bus-bar voltage signal V of half-bridge three-level direct current converterdcAnd output Voltage signal VoComputing and judgement are carried out, each switching tube Duty ratio control letter in isolated form three-level PFC converter (1) is obtained Number, it is specific as follows：
<mrow> <msub> <mi>d</mi> <mn>1</mn> </msub> <mo>=</mo> <mo>|</mo> <mi>s</mi> <mi>i</mi> <mi>n</mi> <mrow> <mo>(</mo> <mi>&amp;omega;</mi> <mi>t</mi> <mo>)</mo> </mrow> <mo>|</mo> <mfrac> <msqrt> <mrow> <mn>2</mn> <msub> <mi>L</mi> <mi>i</mi> </msub> <msub> <mi>f</mi> <mi>s</mi> </msub> <msub> <mi>P</mi> <mi>o</mi> </msub> </mrow> </msqrt> <msub> <mi>V</mi> <mi>g</mi> </msub> </mfrac> <msqrt> <mrow> <mn>1</mn> <mo>-</mo> <mfrac> <msub> <mi>V</mi> <mi>g</mi> </msub> <msub> <mi>V</mi> <mrow> <mi>d</mi> <mi>c</mi> </mrow> </msub> </mfrac> </mrow> </msqrt> </mrow>
<mrow> <msub> <mi>d</mi> <mn>2</mn> </msub> <mo>=</mo> <mfrac> <mrow> <msub> <mi>NV</mi> <mi>o</mi> </msub> </mrow> <msub> <mi>V</mi> <mrow> <mi>d</mi> <mi>c</mi> </mrow> </msub> </mfrac> </mrow>
d1+d2≤0.5
In formula：d1For second switch pipe Q in isolated form three-level PFC converter (1)2With the 3rd switching tube Q3Common ON time Half account for the dutycycles of whole switch periods, i.e. PFC grades of dutycycles of isolated form three-level PFC converter；d2For isolated form three First switch pipe Q in level PFC converter (1)1With the 4th switching tube Q4Conducting dutycycle, i.e., isolated form three-level PFC convert DC/DC grades of dutycycles of device；ω is the angular frequency of AC-input voltage, and the frequency of AC-input voltage is power frequency 50Hz, LiTo be defeated Enter inductance inductance value, fsFor the switching frequency of each switching tube in isolated form three-level PFC converter (1), PoFor the level of isolated form three The power output of pfc converter (1), VgFor the commutating voltage at diode rectifier bridge RB two ends, VdcAnd VoRespectively half-bridge three is electric The DC bus-bar voltage and output voltage of straight current converter, N are high frequency transformer T former secondary turn ratio.
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CN111555605A (en) * 2020-05-22 2020-08-18 西安理工大学 Control method for reducing critical mode three-level converter switching frequency range
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