CN107124105B - Improve the control system and method for isolated form three-level PFC converter PF - Google Patents
Improve the control system and method for isolated form three-level PFC converter PF Download PDFInfo
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- CN107124105B CN107124105B CN201710311410.1A CN201710311410A CN107124105B CN 107124105 B CN107124105 B CN 107124105B CN 201710311410 A CN201710311410 A CN 201710311410A CN 107124105 B CN107124105 B CN 107124105B
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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
Abstract
The invention discloses a kind of control systems 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 terminal of diode rectifier bridge, and the output end of diode rectifier bridge is through the input terminal of input inductance access half-bridge three-level direct current converter；Wherein digital process controller includes ADC module, data processing module and pwm pulse width modulation module；Grid of the output end of the pwm pulse width modulation module through each switching tube in driving circuit access isolated form three-level PFC converter.The control system and method proposed by the present invention for improving three level isolated form pfc converter PF, the input current waveform that can effectively control converter is pure sinusoid, and PF is improved to 1.
Description
Technical field
The invention belongs to the control technology field in Technics of Power Electronic Conversion technology, especially a kind of three level of raising isolated form
The control system and method for pfc converter PF.
Background technique
With the development of power electronics technology, to Harmonics of Input in electrical energy changer and input power factor
The requirement of (Power Factor, PF) is higher and higher, PFC (Power Factor Correction, PFC) transformation
Device has obtained extensive research and application.Pfc converter be broadly divided into it is active and two kinds passive, wherein active PFC have it is small in size,
Light-weight, the advantages that input power factor is high and high-efficient.It is divided, active PFC can be divided for two-stage PFC with circuit structure
Circuit and single- stage PFC circuit.Two-stage pfc circuit is usually by the power factor preconditioner of prime and rear class DC/DC converter group
At wherein PFC grades for realizing input current shaping, and rear class DC/DC converter realizes isolation and voltage transformation regulatory function.Two
Grade PFC solution technique is mature, has the excellent performances such as High Power Factor, high regulation precision and high reaction speed, but at least need
Two sets of control circuits are wanted, cost and complexity are increased.Single- stage PFC circuit by PFC grades of converter and DC/DC grade of switching tube with
Control circuit shares, and has many advantages, such as that structure is simple, at low cost and high-efficient, circuit topological structure and control method become
The research hotspot of current PFC technology.
Currently, the control mode of pfc converter be divided into simulation control and it is digital control.By years of researches and develop,
Analog control technique is highly developed, includes power in field of power supplies due to the simplicity and low cost of implementation of control method
In factor correcting circuit, the dominance market share is occupied.Increasingly it is impossible to meet current energy marks for the limitation of simulation control
Standard is in efficiency, electromagnetic interference (requirement in terms of EMI, and existing digital control often have that method is complicated, is difficult to realize
The problem of.
Summary of the invention
The purpose of the present invention is to provide a kind of control methods simply, is easy to three level of raising isolated form of Digital Implementation
The control system and method for pfc converter PF effectively controls input current waveform sine, improves converter PF.
The technical solution for realizing the aim of the invention is as follows: a kind of control improving isolated form three-level PFC converter PF
System, including isolated form three-level PFC converter and digital process controller, in which:
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 vinThe input terminal of diode rectifier bridge RB is connected, diode is whole
Flow the positive output end connection input inductance L of bridge RBi, the negative output terminal of diode rectifier circuit RB is with reference to zero-potential point, with half
The input terminal of bridge three-level DC converter is connected, and the voltage at the both ends diode rectifier bridge RB is rectified voltage Vg；
The digital process controller includes: ADC module, data processing module and pwm pulse width modulation module, every
The rectified voltage signal V at the both ends diode rectifier bridge RB in a switch periodsg, the DC bus of half-bridge three-level direct current converter
Voltage signal VdcWith output voltage signal Vo, sampled conditioning circuit send to the ADC module of digital process controller, ADC module
It send after each voltage signal is carried out analog-to-digital conversion to the data processing module of digital process controller, by data processing module
The duty cycle control signal of each switching tube is obtained after operation and judgement, the duty cycle control signal of each switching tube is through digital processing control
The pwm pulse width modulation module of device processed exports, and is connected to each switching tube in isolated form three-level PFC converter through driving circuit
Grid.
Further, the half-bridge three-level direct current converter includes: first switch tube Q1And first diode D1, second
Switching tube Q2And the second diode D2, third switching tube Q3And third 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 rectifier diode D7, the second rectifier diode D8, output inductor Lo, output filter capacitor Co, load Ro；Its
Middle input inductance LiOne end connect with the positive output end of diode rectifier bridge RB, input inductance LinThe other end and first switch
Pipe Q1Source electrode, second switch Q2Drain electrode and the first clamp diode D5Cathode be connected, first diode D1With the two or two
Pole pipe D2Inverse parallel is in first switch tube Q respectively1With second switch Q2Both ends, first switch tube Q1Drain electrode and first straight
Flow bus capacitor Cdc1Anode be connected, the first dc-link capacitance Cdc1Cathode and the first clamp diode D5Anode, height
Frequency power transformer T primary side winding N1Same Name of Ends, the second dc-link capacitance Cdc2Anode and the second clamp diode D6Cathode
It is connected, high frequency transformer T primary side winding N1Non-same polarity and second switch Q2Source electrode and third switching tube Q3Drain electrode phase
Even, third switching tube Q3Source electrode and the 4th switching tube Q4Drain electrode, the second clamp diode D6Anode and diode rectifier bridge
The negative output terminal of RB is connected, third diode D3With the 4th diode D4Inverse parallel is in third switching tube Q respectively3With the 4th switch
Pipe Q4Both ends, the 4th power switch tube Q4Source electrode and the second dc-link capacitance Cdc2Cathode be connected, high frequency transformer T's
First vice-side winding N2Same Name of Ends and the first rectifier diode D7Anode be connected, the first vice-side winding N of high frequency transformer T2
Non-same polarity and high frequency transformer T the second vice-side winding N3Same Name of Ends, output filter capacitor CoCathode and load Ro's
One end is connected, output filter capacitor CoAnode and load RoThe other end and output inductor LoOne end be connected, output filter
Wave inductance LoThe other end and the first rectifier diode D7Cathode and the second rectifier diode D8Cathode connection, 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 both ends and be DC bus-bar voltage Vdc, load Ro
The voltage at both 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 tube Q1Source electrode and second switch Q2Drain electrode is connected, and the negative output terminal of diode rectifier bridge RB refers to zero potential
Point and third 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.
It is a kind of improve isolated form three-level PFC converter PF control method, specific implementation the following steps are included:
Step 1, in each switch periods, over-sampling modulate circuit is sampled respectively two in isolated form three-level PFC converter
The rectified voltage signal V at the both ends pole pipe rectifier bridge RBg, the DC bus-bar voltage signal V of half-bridge three-level direct current converterdcWith it is defeated
Voltage signal V outo, the voltage analog signal of sampling is improved to the simulation input for meeting digital process controller after requiring, is sent
Enter the ADC module of digital process controller；
Step 2, the ADC module of digital process controller converts the voltage analog signal after sampling conditioning in step 1
After digital signal, send to the data processing module of digital process controller；
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 the both ends pole pipe rectifier bridge RBg, the DC bus-bar voltage signal V of isolated form three-level DC converterdcWith
Output voltage signal VoOperation and judgement are carried out, each switching tube duty ratio control letter in isolated form three-level PFC converter is obtained
Number；
Step 4, each switching tube duty cycle control signal is defeated through the pwm pulse width modulation module of digital process controller
Out, PWM pulse-width modulation control signal is distributed into each switching tube in isolated form three-level PFC converter through driving circuit, controlled
The normal work of isolated form three-level PFC converter difference switch mode processed, while realizing the PFC function 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 both ends diode rectifier bridge RB after analog-to-digital conversiong, the DC bus of half-bridge three-level direct current converter
Voltage signal VdcWith output voltage signal VoOperation and judgement are carried out, each switching tube in isolated form three-level PFC converter is obtained
Duty cycle control signal, specific as follows:
d1+d2≤0.5
In formula: d1For second switch Q in isolated form three-level PFC converter2With third switching tube Q3Common turn-on time
Half account for the duty ratios of entire switch periods, i.e. PFC grades of duty ratios of isolated form three-level PFC converter；d2For isolated form three
First switch tube Q in level PFC converter1With the 4th switching tube Q4Conducting dutycycle, i.e. isolated form three-level PFC converter
DC/DC grades of duty ratios；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, PoFor the transformation of isolated form three-level PFC
The output power of device, VgFor the rectified voltage at the both ends diode rectifier bridge RB, VdcAnd VoRespectively half-bridge three-level DC converting
The DC bus-bar voltage and output voltage of device, the secondary side turn ratio of the original that N is high frequency transformer T.
Compared with prior art, the present invention its remarkable advantage is: (1) control method is simple, and real-time is good, and dynamic is rung
It should be fast.When the operating conditions such as load sudden change or chugging change, digital process controller can be to the various of real-time sampling
Voltage signal carries out quick, highdensity digital operation, is adjusted in converter according to the working condition of current system and is respectively opened in real time
Close the conducting dutycycle of pipe；(2) control method can be in 90Vrms~265VrmsTotal pressure input range in, effectively control defeated
Entering current waveform is pure sinusoid, reduces 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 is answered
Power improves 2 times that inductive current ripple frequency is power switch tube switching frequency, further decreases the body for outputting and inputting inductance
Product, effectively reduces the system loss of converter, improves the efficiency of converter.
Detailed description of the invention
Fig. 1 is the main circuit diagram of isolated form three-level PFC converter.
Fig. 2 is that isolated form three-level PFC converter respectively switchs mode equivalent circuit diagram in a switch periods, wherein
(a) it is equivalent that~(f) is respectively that isolated form three-level PFC converter switchs mode 1~switch mode 6 in a switch periods
Circuit diagram.
Fig. 3 is the main waveform diagram of isolated form three-level PFC converter under different switch mode in a switch periods.
Fig. 4 is the waveform diagram of input current per unit value in half of power frequency period.
Fig. 5 is PF value and Vm/VdcGraph of relation.
Fig. 6 is the duty ratio waveform diagram for controlling input current sine.
Fig. 7 is the flow chart that the present invention improves isolated form three-level PFC converter PF control method.
Fig. 8 is the structure chart that the present invention improves isolated form three-level PFC converter PF control system.
Specific embodiment
With reference to the accompanying drawing and specific embodiment makes further description to the present invention.
1. working principle of the PFC level work of isolated form three-level PFC converter when discontinuous mode
Isolated form three-level PFC inverter main circuit of the invention is as shown in Figure 1, wherein have the function of input current shaping
PFC grade and output voltage regulatory function DC/DC grade common switch pipe Q2And Q3, therefore it is a kind of typical single- stage PFC change
Parallel operation.When the switching frequency of switching tube is constant, the converter PFC level work under the control of constant conduction duty ratio is disconnected in inductive current
When Discontinuous Conduction mode (Discontinue Current Mode, DCM), inductive current peak is substantially proportional to input voltage, i.e., defeated
Enter electric current and automatically track input voltage waveform, converter has the function of automatic PFC.At this point, switching tube Q2And Q3It is opened for zero current
It is logical, switching tube Q1And Q4It is open-minded for no-voltage, switching loss is effectively reduced, improves transducer effciency.
Below with reference to Fig. 2 a-2f, difference of the isolated form three-level PFC converter in switch periods when analyzing DCM
Switch mode.
For convenience of analysis, 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 much higher than input voltage frequency.
Switch 1 [t of mode0<t<t1]: shown in equivalent circuit such as Fig. 2 (a), switching tube Q1And Q2It simultaneously turns on, the first direct current
Bus capacitor Cdc1To high frequency transformer T primary side winding N1Electric discharge, primary voltage of transformer VTN1For-Vdc/ 2, direction is under upper bear
Just, primary side winding electric current linearly increases.High frequency transformer T pair side the second winding N3Voltage be it is upper it is negative under just, the second rectification two
Pole pipe D8Forward conduction, outputting inductance LoIt charges, voltage V on inductanceLo=Vdc/ 2N-Vo, export electric current and linearly increase.
Switch 2 [t of mode1<t<t2]: shown in equivalent circuit such as Fig. 2 (b), switching tube Q2And Q3It simultaneously turns on, exchange input
Voltage vinAfter diode rectifier bridge RB rectification, rectified voltage VgTo input inductance LiCharging, inductive current linearly increase, energy
It is stored in input inductance.High frequency transformer T primary side winding N at this time1Voltage VTN1It is 0, the first clamp diode D5For high frequency change
The primary current afterflow of depressor T provides access.Outputting inductance LoTo output filter capacitor CoWith load RLElectric discharge, the second rectification two
Pole pipe D8Play freewheeling diode at this time.
Switch 3 [t of mode2<t<t3]: shown in equivalent circuit such as Fig. 2 (c), switching tube Q3And Q4It simultaneously turns on, is stored in defeated
Enter inductance LiIn energy through switching tube Q1Anti-paralleled diode D1To two dc-link capacitance Cdc1And Cdc2It charges,
Input inductive drop VLi=Vi- Vdc, inductive current linearly reduces.Meanwhile electric current is exported from the second rectifier diode D8The change of current is arrived
First rectifier 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 4 [t of mode3<t<t4]: shown in equivalent circuit such as 2 figures (d), switching tube Q3And Q4It simultaneously turns on, the second direct current
Bus capacitor Cdc2To high frequency transformer T primary side winding N1Electric discharge, primary voltage of transformer VTN1For Vdc/ 2, direction be it is upper just under
Negative, primary side winding electric current linearly increases.High frequency transformer T pair side the first winding N2Voltage be upper just lower negative, the first rectification two
Pole pipe D7Forward conduction, outputting inductance LoIt charges, voltage V on inductanceLo=Vdc/ 2N-Vo, export electric current and linearly increase.At this point,
Input inductive current is still equal to zero, is discontinuous mode.
Switch 5 [t of mode4<t<t5]: shown in equivalent circuit such as Fig. 2 (e), switching tube Q2And Q3It simultaneously turns on, exchange input
Voltage vinAfter diode rectifier bridge RB rectification, rectified voltage VgTo input inductance LiCharging, inductive current linearly increase, energy
It is stored in input inductance.High frequency transformer T primary side winding N at this time1Voltage VTN1It is 0, the second clamp diode D6For high frequency change
The primary current afterflow of depressor T provides access.Outputting inductance LoTo output filter capacitor CoWith load RLElectric discharge, the second rectification two
Pole pipe D7Play freewheeling diode at this time.
Switch 6 [t of mode5<t<t6]: shown in equivalent circuit such as Fig. 2 (f), switching tube Q1And Q2It simultaneously turns on, at this time 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 Cdc2It charges, inputs inductive drop VLi=Vi- Vdc, inductive current linearly reduces.Meanwhile it is defeated
Electric current is from the first rectifier diode D out7The change of current is to the second rectifier diode D8.Work as t=t6When, input the energy 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 vinIt (t) is pure sinusoid, expression formula are as follows:
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) rectified voltage obtained after diode rectifier bridge RB rectification are as follows:
Vg=Vm|sin(ωt)| (2)
In a switch periods, the peak value of inductive current are as follows:
Wherein d1Representation switch pipe Q2And Q3The duty ratio that the half of common turn-on time accounts for entire switch periods (is isolated
PFC grades of duty ratios of type three-level PFC converter), LiTo input inductance inductance value, TsFor the switch periods of switching tube.
In each switch periods, inductance L is inputtediThe volt-seconds area at both ends is equal, it may be assumed that
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 duty ratio answered.
It is obtained by formula (3) and formula (4), inputs average value of the inductive current in a switch periods:
So, input current are as follows:
F in formulasFor the switching frequency of switching tube.
For the shape convenient for analyzing input current, input current can be carried out marking change, a reference value Vmd1 2/Lifs.Root
Input current expression formula after changing according to the available mark of formula (6) are as follows:
When different input voltage amplitudes and DC bus-bar voltage ratio can be drawn according to formula (7), in half of power frequency period
The waveform of input current per unit value, as shown in Figure 4.It can be seen from the figure that the shape of input current waveform and Vm/VdcHave
It closes, Vm/VdcSmaller, input current is closer to sinusoidal.
The average value P of converter input power in half of power frequency period can be acquired by formula (1) and formula (6)inAre as follows:
T in formulalineFor the AC-input voltage period.
Assuming that transducer effciency is 100%, then input power is equal to output power, i.e. Pin=Po, can must be accounted for by formula (8)
Sky ratio d1Are as follows:
It can be in the hope of the expression formula of PF value by formula (6) and formula (8):
PF value and V are made according to formula (9)m/VdcRelation curve, as shown in Figure 5.It can be seen from the figure that PF and input
Voltage magnitude VmWith DC bus-bar voltage VdcRatio it is related, Vm/VdcSmaller, PF is bigger.In 90Vrms~265VrmsInput electricity
It presses in range, as input voltage amplitude VmOne timing can use topological structure and improve DC bus-bar voltage Vdc, to increase transformation
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 relationship are as follows:
Wherein d2Representation switch pipe Q1And Q4Turn-on time accounts for duty ratio (the i.e. isolated form three-level PFC of entire switch periods
DC/DC grades of duty ratios of converter), N is the secondary side turn ratio of original 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 VoWhen for steady state value, d2Calculated value is constant.
To work normally isolated form three-level PFC converter, the duty ratio d of converter PFC grades of control1It is converted with control
DC/DC grades of device of duty ratio d2Between restriction relation are as follows:
d1+d2≤0.5 (12)
According to Fig. 4 and Fig. 5 it is found that the input current waveform of isolated form three-level PFC converter and PF value are electric with input
The ratio V of pressure amplitude value and DC bus-bar voltagem/VdcIt is related, Vm/VdcSmaller, then input current waveform is closer to sinusoidal, converter
PF is closer to 1.When input voltage is certain, by improving converter DC bus-bar voltage VdcVoltage class come when increasing PF,
It will increase the voltage stress of switching tube in converter, increase system loss, reduce transducer effciency, 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
Entering current waveform is pure sinusoid, improves the PF to 1 of converter.
2. controlling the derivation and realization of input current sine 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 are as follows:
Wherein d0PFC grades of converter of duty ratio when for input current waveform pure sinusoid.
Comparison actually enters current expression, can obtain the relationship between duty ratio are as follows:
It can be derived from the input power of converter by formula (1) and formula (13) are as follows:
D as available from the above equation0Are as follows:
Formula (16) is brought into formula (14), convolution (12) can must control the duty ratio of input current sine are as follows:
The duty ratio 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 duty ratios of parallel operation change according to above formula rule, the input current waveform of isolated form three-level PFC converter is pure
String can make the PF=1 of converter, as unity power factor with input voltage same-phase.
At this point, duty ratio of each switching tube in a switch periods is respectively as follows: 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 method is as shown in fig. 7, specific
Implementation process is as follows:
(1) the rectified voltage V in isolated form three-level PFC converterg, DC bus-bar voltage VdcWith output voltage signal Vo
It send by over-sampling modulate circuit to the ADC module of digital process controller；
(2) it after the voltage analog signal that sampling is got in (1) is converted to digital signal by ADC module, send to data processing
Module；
(3) data processing module utilizes voltage signal Vg,VdcAnd VoOperation and judgement are carried out, duty ratio d is obtained1And d2It send
To pwm pulse width modulation module；
(4) pwm pulse width modulation module is determining and exports the pwm control signal of each switching tube, controls through driving circuit
Each switching tube in isolated form three-level PFC converter, works normally converter.
3. control system and method that the present invention improves isolated form three-level PFC converter PF
In conjunction with Fig. 8, the present invention improves the control system of isolated form three-level PFC converter PF, including three level of isolated form
Pfc converter 1 and digital process controller 2, in which:
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 the input terminal of diode rectifier bridge RB, diode
The positive output end connection input inductance L of rectifier bridge RBi, the negative output terminal of diode rectifier circuit RB be with reference to zero-potential point, with
The input terminal of half-bridge three-level direct current converter is connected, and the voltage at the both ends diode rectifier bridge RB is rectified voltage Vg；
The digital process controller 2 includes: ADC module, data processing module and pwm pulse width modulation module,
The rectified voltage signal V at the both ends diode rectifier bridge RB 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 conditioning circuit send to the ADC module of digital process controller 2, ADC mould
Block is sent after each voltage signal is carried out analog-to-digital conversion to the data processing module of digital process controller 2, by data processing mould
Obtain the duty cycle control signal of each switching tube after the operation and judgement of block, the duty cycle control signal of each switching tube through number at
The pwm pulse width modulation module output for managing controller 2, is connected in isolated form three-level PFC converter 1 through driving circuit and respectively opens
Close the grid of pipe.
Further, the half-bridge three-level direct current converter includes: first switch tube Q1And first diode D1, second
Switching tube Q2And the second diode D2, third switching tube Q3And third 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 rectifier diode D7, the second rectifier diode D8, output inductor Lo, output filter capacitor Co, load Ro；Its
Middle input inductance LiOne end connect with the positive output end of diode rectifier bridge RB, input inductance LinThe other end and first switch
Pipe Q1Source electrode, second switch Q2Drain electrode and the first clamp diode D5Cathode be connected, first diode D1With the two or two
Pole pipe D2Inverse parallel is in first switch tube Q respectively1With second switch Q2Both ends, first switch tube Q1Drain electrode and first straight
Flow bus capacitor Cdc1Anode be connected, the first dc-link capacitance Cdc1Cathode and the first clamp diode D5Anode, height
Frequency power transformer T primary side winding N1Same Name of Ends, the second dc-link capacitance Cdc2Anode and the second clamp diode D6Cathode
It is connected, high frequency transformer T primary side winding N1Non-same polarity and second switch Q2Source electrode and third switching tube Q3Drain electrode phase
Even, third switching tube Q3Source electrode and the 4th switching tube Q4Drain electrode, the second clamp diode D6Anode and diode rectifier bridge
The negative output terminal of RB is connected, third diode D3With the 4th diode D4Inverse parallel is in third switching tube Q respectively3With the 4th switch
Pipe Q4Both ends, the 4th power switch tube Q4Source electrode and the second dc-link capacitance Cdc2Cathode be connected, high frequency transformer T's
First vice-side winding N2Same Name of Ends and the first rectifier diode D7Anode be connected, the first vice-side winding N of high frequency transformer T2
Non-same polarity and high frequency transformer T the second vice-side winding N3Same Name of Ends, output filter capacitor CoCathode and load Ro's
One end is connected, output filter capacitor CoAnode and load RoThe other end and output inductor LoOne end be connected, output filter
Wave inductance LoThe other end and the first rectifier diode D7Cathode and the second rectifier diode D8Cathode connection, 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 both ends and be DC bus-bar voltage Vdc, load Ro
The voltage at both 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 tube Q1Source electrode and second switch Q2Drain electrode is connected, and the negative output terminal of diode rectifier bridge RB refers to zero potential
Point and third 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 uses dsp chip TMS320F28335.
It is a kind of improve isolated form three-level PFC converter PF control method, specific implementation the following steps are included:
Step 1, in each switch periods, over-sampling modulate circuit is sampled respectively two in isolated form three-level PFC converter 1
The rectified voltage signal V at the both ends pole pipe rectifier bridge RBg, the DC bus-bar voltage signal V of half-bridge three-level direct current converterdcWith it is defeated
Voltage signal V outo, the voltage analog signal of sampling is improved to the simulation input for meeting digital process controller 2 after requiring, is sent
Enter the ADC module of digital process controller 2；
Step 2, the ADC module of digital process controller 2 converts the voltage analog signal after sampling conditioning in step 1
After digital signal, send to the data processing module of digital process controller 2；
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 the both ends pole pipe rectifier bridge RBg, the DC bus-bar voltage signal V of isolated form three-level DC converterdcWith
Output voltage signal VoOperation 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, each switching tube duty cycle control signal is defeated through the pwm pulse width modulation module of digital process controller 2
Out, PWM pulse-width modulation control signal is distributed into each switching tube in isolated form three-level PFC converter 1 through driving circuit, controlled
The normal work of the different switch mode of isolated form three-level PFC converter 1 processed, while realizing the PFC function and output of converter
Voltage regulatory 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 both ends diode rectifier bridge RB after analog-to-digital conversiong, the DC bus of half-bridge three-level direct current converter
Voltage signal VdcWith output voltage signal VoOperation and judgement are carried out, each switching tube in isolated form three-level PFC converter 1 is obtained
Duty cycle control signal, specific as follows:
d1+d2≤0.5
In formula: d1For second switch Q in isolated form three-level PFC converter 12With third switching tube Q3When common conducting
Between half account for the duty ratios of entire switch periods, i.e. PFC grades of duty ratios of isolated form three-level PFC converter；d2For isolated form
First switch tube 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 duty ratios of device；ω is the angular frequency of AC-input voltage, and the frequency of AC-input voltage is power frequency 50Hz, LiIt is 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 output power of converter 1, VgFor the rectified voltage at the both ends diode rectifier bridge RB, VdcAnd VoRespectively half-bridge three-level direct current
The DC bus-bar voltage and output voltage of converter, the secondary side turn ratio of the original that N is high frequency transformer T.
In conclusion the invention discloses a kind of control system and method for improving isolated form three-level PFC converter PF,
The various voltage signals needed for real-time sample control in each switch periods are carried out quick, high using digital process controller
The digital operation of density obtains the control duty that can make isolated form three-level PFC converter input current waveform pure sinusoid
Than.The advantages of control method has real-time good, and dynamic response is fast, is convenient for Digital Realization；The control system can be effective
The system loss for reducing converter, improves the efficiency of converter, can be in 90Vrms~265VrmsTotal pressure input range in, have
Effect control input current waveform sine, improves converter PF to 1.
Claims (1)
1. a kind of control method for improving isolated form three-level PFC converter PF, which is characterized in that including three level of isolated form
Pfc converter (1) and digital process controller (2), in which: the isolated form three-level PFC converter (1) includes exchange input
Power supply vin, diode rectifier bridge RB, input inductance LiAnd half-bridge three-level direct current converter, wherein alternating current input power supplying vinConnection
The input terminal of diode rectifier bridge RB, the positive output end connection input inductance L of diode rectifier bridge RBi, diode rectifier circuit
The negative output terminal of RB is to be connected with reference to zero-potential point with the input terminal of half-bridge three-level direct current converter, diode rectifier bridge
The voltage at the both ends RB is rectified voltage Vg；
The digital process controller (2) includes: ADC module, data processing module and pwm pulse width modulation module, specifically
Realize the following steps are included:
Step 1, in each switch periods, over-sampling modulate circuit samples two poles in isolated form three-level PFC converter (1) respectively
The rectified voltage signal V at the both ends pipe rectifier bridge RBg, 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 improved to the simulation input for meeting digital process controller (2) after requiring, is sent
Enter the ADC module of digital process controller (2)；
Step 2, the ADC module of digital process controller (2) is converted to the voltage analog signal after sampling conditioning in step 1
After digital signal, send to the data processing module of digital process controller (2)；
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 the both ends pipe rectifier bridge RBg, the DC bus-bar voltage signal V of half-bridge three-level direct current converterdcAnd output
Voltage signal VoOperation 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, each switching tube duty cycle control signal is exported through the pwm pulse width modulation module of digital process controller (2),
PWM pulse-width modulation control signal is distributed into each switching tube in isolated form three-level PFC converter (1) through driving circuit, is controlled
The normal work of the different switch mode of isolated form three-level PFC converter (1) processed, while realizing the PFC function of converter and defeated
Voltage regulatory function out；
The data processing module of digital process controller described in step 3 (2) to through step 1 sample and step 2 analog-to-digital conversion after
The both ends diode rectifier bridge RB rectified voltage signal Vg, the DC bus-bar voltage signal V of half-bridge three-level direct current converterdc
With output voltage signal VoOperation and judgement are carried out, each switching tube duty ratio control in isolated form three-level PFC converter (1) is obtained
Signal processed, specific as follows:
d1+d2≤0.5
In formula: d1For second switch Q in isolated form three-level PFC converter (1)2With third switching tube Q3Common turn-on time
Half account for the duty ratios of entire switch periods, i.e. PFC grades of duty ratios of isolated form three-level PFC converter；d2For isolated form three
First switch tube 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 duty ratios of device；ω is the angular frequency of AC-input voltage, and the frequency of AC-input voltage is power frequency 50Hz, LiIt is defeated
Enter inductance inductance value, fsFor the switching frequency of each switching tube in isolated form three-level PFC converter (1), PoFor three level of isolated form
The output power of pfc converter (1), VgFor the rectified voltage at the both ends diode rectifier bridge RB, VdcAnd VoRespectively three electricity of half-bridge
The DC bus-bar voltage and output voltage of straight current converter, the secondary side turn ratio of the original that N is high frequency transformer T.
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| CN108696156A (en) * | 2018-07-27 | 2018-10-23 | 深圳英飞源技术有限公司 | A kind of control method and its device of supply convertor |
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| CN2415540Y (en) * | 2000-01-24 | 2001-01-17 | 南京航空航天大学 | Three-level DC Converter of zero-voltage zero-current switch |
| CN101764528A (en) * | 2010-01-08 | 2010-06-30 | 南京航空航天大学 | High power factor DCM Boost PFC converter |
| CN103633866A (en) * | 2013-11-29 | 2014-03-12 | 南京理工大学 | Device and method for inhibiting single-phase photovoltaic grid-connected inverter input current low frequency pulsation |
| CN104297701A (en) * | 2014-09-17 | 2015-01-21 | 思源清能电气电子有限公司 | Turn-off testing platform for single bridge arm in three-level H bridge converter and method thereof |
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