CN106487215B - The optimal control of CRM boost PFC converter variation turn-on time - Google Patents

The optimal control of CRM boost PFC converter variation turn-on time Download PDF

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Publication number
CN106487215B
CN106487215B CN201610993935.3A CN201610993935A CN106487215B CN 106487215 B CN106487215 B CN 106487215B CN 201610993935 A CN201610993935 A CN 201610993935A CN 106487215 B CN106487215 B CN 106487215B
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time
turn
output
circuit
voltage
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CN106487215A (en
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任小永
吴羽
郭哲辉
陈乾宏
张之梁
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Nanjing University of Aeronautics and Astronautics
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Nanjing University of Aeronautics and Astronautics
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/4225—Arrangements for improving power factor of AC input using a non-isolated boost 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
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0012—Control circuits using digital or numerical techniques
    • 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

Abstract

The invention discloses the optimal control of CRM boost PFC converter variation turn-on time, it can be achieved that changing the unification of turn-on time under wide input voltage and variable load occasion, avoid in conventional method to vinMore than or less than Vo/ 2 two kinds of different situations carry out the complexity problem of classification control.The present invention passes through sampling input and output voltage instantaneous value, through corresponding calculating or signal condition in real time, adjusts the turn-on time of switching tube in real time to reduce input current abnormality.The constant component of turn-on time is adjusted by voltage PI ring, and variable part is calculated by digitial controller according to unified algorithm or is adjusted in real time by peripheral circuits such as analog dividers.The present invention is without detecting output power and input voltage virtual value, and it is not necessarily to input voltage phase lock circuitry, variation turn-on time control under the conditions of realizing that converter is any in working range by normalized control method, to significantly simplify circuit cost and control difficulty.

Description

The optimal control of CRM boost PFC converter variation turn-on time
Technical field
The present invention relates to power inverter technologies, and in particular to one kind is applied to the variation conducting of CRM boost PFC converter The optimal control of time.
Background technique
The extensive use of power electronic equipment brings a large amount of harmonic pollution to power grid, has seriously affected the confession of power grid The normal work of electricity quality and other electrical equipments.In order to reduce power electronic equipment bring harmonic pollution, meet international electricity The harmonic standard IEC61000-3-2 that the work committee formulates is needed using PFC (Power Factor Correction, PFC) converter inhibit harmonic component make all kinds of electrical equipments reach required harmonic standard.Wherein, CRM Boost PFC converter is widely used due to the advantages that its power factor is high, small in size, light-weight and at low cost.
The variation turn-on time control of CRM boost PFC converter is generally by increasing positive inductive current turn-on time Loss brought by the reversed resonance of inductive current is compensated, so that the average value of inductive current is equal with sinusoidal benchmark current value.But It needs when being model analysis to vinMore than or less than Vo/ 2 two kinds of different situations are discussed respectively, the control of digital method Algorithm is complicated, and when use analog hardware realization, in the case of needing to realize two kinds under different turn-on control circuits, different condition The functions such as judgement of relationship between the switching and input voltage and output voltage of turn-on time control circuit.This kind of control method So that the cost of control circuit is significantly increased with power consumption, it is difficult to meet the hair of the high-efficiency and low-cost of CRM boost PFC converter Exhibition demand.Therefore it needs to optimize traditional variation turn-on time control.
Summary of the invention
The invention aims to solve in traditional CRM boost PFC converter variation turn-on time control for vinGreatly In or less than Vo/ 2 both of these case need to calculate separately brought complex calculation problem, propose that one kind can be by analog control circuit Or the optimal control method that digitial controller is realized, this method do not need to carry out the survey of power detection and input voltage virtual value Amount, under the conditions of any in CRM boost PFC converter working range, switching tube turn-on time Ton(t) calculating process is all It is consistent, to reduce computational complexity and system cost.
Above-mentioned purpose is achieved by the following technical solution:
A kind of CRM boost PFC converter variation turn-on time optimal control, realizes that circuit includes CRM boost PFC Inverter main circuit and control circuit.Control circuit is by input voltage sample circuit, output voltage sampling circuit, inductive current mistake Null detector, digitial controller or analog control circuit are constituted, digitial controller include ADC analog/digital conversion unit, in Disconnected system, operation processing unit, the enhanced pulse capture module of eCAP and the enhanced pulse width modulation module of ePWM；It simulates control Circuit includes pi regulator, divider circuit and differential amplifier circuit.
Wherein, the CRM boost PFC inverter main circuit by electromagnetic interface filter, rectifier bridge, input capacitance, inductance, open Guan Guan, diode, output capacitance and load are constituted；Input on rear side of the input terminal connection rectifier bridge of the input voltage sample circuit Capacitor CinBoth ends, output end connect divider circuit in multiplier input terminal or digitial controller ADC thief hatch；Institute State the input terminal connection output loading R of output voltage sampling circuitloadBoth ends, output end is respectively connected to transport by resistance Put OP1With amplifier OP2Reverse input end or digitial controller ADC thief hatch；The amplifier OP of the pi regulator1It is reversed defeated Enter end connection divider resistance R3With R4Between sampled output, positive input connect reference voltage Vref, output signal Verror It is connected to amplifier OP3Positive input；The input terminal of the multiplier of the divider circuit is separately connected divider resistance R1With R2 Between sampled output and amplifier OP2Output end, output end pass through resistance R8Connect amplifier OP2Reverse input end, Amplifier OP2Reverse input end pass through resistance connect divider resistance R3With R4Between sampled output, positive input connect function Rate, output signal VaddPass through resistance R9Connect amplifier OP3Inverting input terminal；The amplifier OP of the differential amplifier circuit3's Output signal VcompareIt is connected to amplifier OP4Reverse input end.
A kind of optimal control of CRM boost PFC converter variation turn-on time, it is any in converter working range Under the conditions of, the turn-on time T of switching tubeon(t) calculating process is all consistent, including step as described below:
1) to turn-on time Ton(t) constant component Ton_errorIt is calculated, which is adjusted by voltage PI ring, For controlling the output power and output voltage of converter；
2) to turn-on time Ton(t) variable part Ton_vary(t) it is calculated, which is used to input electricity in converter Pressing through zero, nearby for the additional turn-on time for increasing switching tube to improve input current abnormality, quantitative relationship is as follows:
Wherein, ZrIt is characteristic impedance,L is the liter in CRM boost PFC inverter main circuit Piezoelectricity inductance value, CossIt is the output junction capacitance of switching tube, CdpIt is the parasitic capacitance value of diode, VoIt is output voltage instantaneous value, vinIt is input voltage instantaneous value, input voltage vinMore than or less than output voltage Vo/2；
3) by error turn-on time Ton_errorWith real-time variable turn-on time Ton_vary(t) it is added, obtains work at present item Corresponding turn-on time T under parton(t), it is shown below:
Ton(t)=Ton_error+Ton_vary(t) (2)
4) by corresponding turn-on time Ton(t) driving signal is converted to, realizes the variation to CRM boost PFC converter Turn-on time control.
A method of above-mentioned optimal control is realized using digitial controller, is included the steps that as described below:
1) the input capacitance C on rear side of the analog/digital conversion unit sampling converter rectifier bridge of digitial controllerinBoth ends Input voltage vinWith output loading RloadThe output voltage V at both endso, obtain corresponding sample magnitude vin/KinWith Vo/Ko, KinIt is The partial pressure coefficient of input voltage sample circuit, KoIt is the partial pressure coefficient of output voltage sampling circuit；
2) output voltage sampled value Vo/KoWith reference voltage VrefIt is compared in interruption system, error amount △ V passes through Error turn-on time T is generated after voltage PI ring operationon_error.Wherein, reference voltage VrefIt is removed for the control target value of output voltage Coefficient is divided with output voltage, generally takes 1~3V；
3) operation processing unit of digitial controller is according to the following formula to Ton_vary(t) it is calculated in real time:
Wherein, ZrIt is characteristic impedance:L is the liter in CRM boost PFC inverter main circuit Piezoelectricity inductance value, CossIt is the output junction capacitance of switching tube, CdpIt is the parasitic capacitance value of diode；
4) by error turn-on time Ton_errorWith real-time variable turn-on time Ton_vary(t) it is added, obtains work at present item Corresponding turn-on time T under parton(t), it is shown below:
Ton(t)=Ton_error+Ton_vary(t) (4)
5) rising edge signal of the square-wave signal of digitial controller eCAP module capture inductive current zero-crossing detector output, Determine the switching tube in CRM boost PFC inverter main circuit opens the moment；
6) digitial controller ePWM module is by corresponding turn-on time Ton(t) PWM wave signal is converted to export to driving electricity Road, driving signal needed for generating variation turn-on time control.
A method of above-mentioned optimal control is realized using analog control circuit, is included the steps that as described below:
1) input and output voltage sample circuit is by sampled value Vo/KoAnd vin/KinIt is sent respectively to pi regulator and divider electricity Lu Zhong, KinIt is the partial pressure coefficient of input voltage sample circuit, KoIt is the partial pressure coefficient of output voltage sampling circuit；
2) pi regulator circuit is by output voltage sampled value Vo/KoWith reference voltage value VrefIt compares to obtain voltage error Value, and corresponding error turn-on time T is exported by simulation PI operationon_errorVoltage signal Verror, the following institute of corresponding relationship Show:
Wherein, by adjusting resistance R5、R6With capacitor C1It can change the proportionality coefficient and integral coefficient of pi regulator；
3) divider circuit calculates variable turn-on time in real time, and exports corresponding real-time variable turn-on time Ton_vary(t) Voltage signal Vadd, the expression formula of the voltage signal is as follows:
Resistance in circuit is determined according to following equation:
Then voltage signal VaddCorresponding real-time variable turn-on time Ton_vary(t) corresponding relationship is as follows:
Wherein, KMIt is the gain coefficient of multiplier, dusaw/ dt is the slope of sawtooth voltage signal, ZrIt is characteristic impedance:L is the boost inductance value in CRM boost PFC inverter main circuit, CossIt is the output of switching tube Junction capacitance, CdpIt is the parasitic capacitance value of diode；
4) by differential amplifier circuit, by voltage signal VerrorAnd VaddComparison voltage needed for being converted to modulation wave signal Value Vcompare, that is, have:
Comparing voltage value VcompareWith turn-on time Ton(t) corresponding relationship is as follows:
5) rising edge signal of the square-wave signal of rest-set flip-flop detection inductive current zero cross detection circuit output confirms switch Pipe turn-on instant.The comparing voltage value V of modulation wave signal comparator positive and negative terminalcompareIt is handed over sawtooth voltage signal and cuts determining open It closes pipe and turns off the moment.After switching tube is opened, sawtooth signal is started from scratch linearly increasing until and VcompareIt is defeated when equal Switching tube cut-off signals out complete the variation turn-on time control of CRM boost PFC converter.
Advantages of the present invention:
1, CRM boost PFC converter of the invention becomes the optimal control of turn-on time, avoids in traditional control method The complexity problem for needing to carry out Discrete control below or above 1/2 output voltage according to input voltage proposes unified realization Mode can realize input voltage below or above the unification under 1/2 output voltage different condition based on a set of hardware simulation circuit Control, to simplify circuit.
2, constant component by voltage PI ring carries out closed loop adjusting in turn-on time operation of the invention, therefore can reduce output Power detection link；Variable part is based on input and output voltage instantaneous sampling value and is adjusted, therefore can save the tradition side of tabling look-up The measurement of input voltage phase lock circuitry and input voltage virtual value in formula.Therefore answering for peripheral analog circuit can be further decreased The operand of miscellaneous degree and digital control algorithm facilitates the power consumption and cost that reduce control system；
3, the present invention optimizes control by the change turn-on time to CRM boost PFC converter, can be effectively suppressed defeated Enter the harmonic content size of electric current, it is significant to the reducing effect of input current THD.
Detailed description of the invention
Fig. 1 is the main circuit of CRM boost PFC converter；
Fig. 2 is to realize variation turn-on time optimal control to the approximate processing schematic diagram of boost inductor current waveform；
Fig. 3 is the digital control circuit for realizing the variation turn-on time optimal control of CRM boost PFC converter of the invention Figure；
Fig. 4 is the control flow chart of the invention based on digitial controller；
Fig. 5 is that of the invention being realized using analog circuit changes turn-on time optimal control to CRM boost PFC converter Schematic diagram；
Fig. 6 is that constant on-time control and variation turn-on time of the invention is respectively adopted in CRM boost PFC converter Control the comparison diagram that the input current THD in 110V and 220V AC-input voltage changes with output power；
Primary symbols title in above-mentioned figure: Iin- mains input current；IL- inductive current；Ipeak- inductive current peak Value；Ivalley- inductive current valley；Iavg- inductive current average value；vinThe instantaneous voltage at-input capacitance both ends；Vo— Output voltage；VdsThe drain-source step voltage of-switching tube；Δ V-voltage PI ring error amount；Vcompare- comparing voltage value；Vref— Reference voltage；L-boost inductance；D-diode；Cin- input capacitance；CossThe output junction capacity of-switching tube；Cqp- bis- poles The parasitic capacitance of pipe；Cbus- output capacitance；C1The coefficient capacitor of-pi regulator；Rload- load resistance；R1- bleeder circuit Resistance；R2- voltage divider circuit Resistance；R3- voltage divider circuit Resistance；R4- voltage divider circuit Resistance；R5The coefficient electricity of-pi regulator Resistance；R6The coefficient resistance of-pi regulator；R7The coefficient resistance of-divider circuit；R8The coefficient resistance of-divider circuit； R9The coefficient resistance of-differential amplifier circuit；R10The coefficient resistance of-differential amplifier circuit；Kin- input voltage sample circuit point Press coefficient；Ko- output voltage sampling circuit divides coefficient；KMThe multiplication coefficient of-multiplier；Ton_errorWhen-error is connected Between；Ton_vary- variable turn-on time；Ton- switching tube turn-on time；dusaw/ dt-sawtooth wave the rate of rise.
Specific embodiment
Optimal control method and principle of the invention are specifically introduced with reference to the accompanying drawings and examples.
Embodiment one:
The optimal control of CRM boost PFC converter variation turn-on time of the present invention, in CRM boost PFC converter work Under the conditions of making any in range, the turn-on time T of switching tubeon(t) calculating process is all consistent.It is controlled by the optimization System, can reduce the complexity of entire control system on the basis of reducing CRM boost PFC converter input current THD, from And reduce system cost.Used optimal control is based on the average current of inductance in CRM boost PFC converter and sine The equal principle of reference current, and due to inductive current in a switch periods in addition to extremely short resonance time is all linearly to become Change, therefore can be the calculating of triangle (see Fig. 2) to simplify inductance average current by inductive current waveform approximate processing.
The optimal control of CRM boost PFC converter variation turn-on time of the invention, in converter working range Under the conditions of any, the turn-on time T of switching tubeon(t) calculating process is all consistent, including step as described below:
1) to turn-on time Ton(t) constant component Ton_errorIt is calculated, which is adjusted by voltage PI ring, For controlling the output power and output voltage of converter；
2) to turn-on time Ton(t) variable part Ton_vary(t) it is calculated, which is used to input electricity in converter Pressing through zero, nearby for the additional turn-on time for increasing switching tube to improve input current abnormality, quantitative relationship is as follows:
Wherein, ZrIt is characteristic impedance,L is the liter in CRM boost PFC inverter main circuit Piezoelectricity inductance value, CossIt is the output junction capacitance of switching tube, CdpIt is the parasitic capacitance value of diode, vinIt is that input voltage is instantaneous Value, VoIt is output voltage instantaneous value, input voltage vinMore than or less than output voltage Vo/2；
3) by error turn-on time Ton_errorWith real-time variable turn-on time Ton_vary(t) it is added, obtains work at present item Corresponding turn-on time T under parton(t), it is shown below:
Ton(t)=Ton_error+Ton_vary(t) (2)
4) by corresponding turn-on time Ton(t) driving signal is converted to, realizes the variation to CRM boost PFC converter Turn-on time control.
Further design of the invention is unified switching tube turn-on time TonCalculation expression, which passes through Following steps obtain:
1) the sinusoidal reference current I under current operating conditions is calculatedref(t):
Wherein, flIt is line frequency；
2) ignore resonant process bring non-linear section extremely short in switch periods, it can will be at inductive current waveform approximation Manage into triangle, therefore the peak I of inductive currentpeakWith valley IvalleyIt can be counted respectively by expression formula (4) and expression formula (5) It calculates and obtains:
Therefore the average value I of inductive current can be calculated by following expressionavg:
3) according to the average current I of inductance in CRM boost PFC converteravgWith sinusoidal reference current IrefEqual original It manages, unified turn-on time T after available optimization processingon(t)；
Wherein, error turn-on time Ton_errorIt is corresponding to optimize unified turn-on time Ton(t) constant component in, in real time Variable turn-on time Ton_vary(t) corresponding to optimize unified turn-on time Ton(t) variable part in, that is, have:
Therefore for the turn-on time T under the conditions of any in CRM boost PFC converter working range, after optimizationon (t) expression formula is all unified.
The CRM boost PFC converter changes the optimal control of turn-on time, such as can be by following using digitial controller Step is implemented:
1) the input capacitance C on rear side of the analog/digital conversion unit sampling converter rectifier bridge of digitial controllerinBoth ends Input voltage vinWith output loading RloadThe output voltage V at both endso, obtain corresponding sample magnitude vin/KinWith Vo/Ko, KinIt is The partial pressure coefficient of input voltage sample circuit, KoIt is the partial pressure coefficient of output voltage sampling circuit；
2) output voltage sampled value Vo/KoWith reference voltage VrefIt is compared in interruption system, error amount △ V passes through Error turn-on time T is generated after voltage PI ring operationon_error.Wherein, reference voltage VrefIt is removed for the control target value of output voltage Coefficient is divided with output voltage, generally takes 1~3V；
3) operation processing unit of digitial controller is according to the following formula to Ton_vary(t) it is calculated in real time:
Wherein, ZrIt is characteristic impedance:L is the liter in CRM boost PFC inverter main circuit Piezoelectricity inductance value, CossIt is the output junction capacitance of switching tube, CdpIt is the parasitic capacitance value of diode；
4) by error turn-on time Ton_errorWith real-time variable turn-on time Ton_vary(t) it is added, obtains work at present item Corresponding turn-on time T under parton(t), it is shown below:
Ton(t)=Ton_error+Ton_vary(t) (10)
5) rising edge signal of the square-wave signal of digitial controller eCAP module capture inductive current zero-crossing detector output, Determine the switching tube in CRM boost PFC inverter main circuit opens the moment；
6) digitial controller ePWM module is by corresponding turn-on time Ton(t) PWM wave signal is converted to export to driving electricity Road, driving signal needed for generating variation turn-on time control.
The CRM boost PFC converter change turn-on time optimal control, such as use analog control circuit can by with Under type carries out:
1) input and output voltage sample circuit is by sampled value Vo/KoAnd vin/KinIt is sent respectively to pi regulator and divider electricity Lu Zhong, KinIt is the partial pressure coefficient of input voltage sample circuit, KoIt is the partial pressure coefficient of output voltage sampling circuit；
2) pi regulator circuit is by output voltage sampled value Vo/KoWith reference voltage value VrefIt compares to obtain voltage error Value, and corresponding error turn-on time T is exported by simulation PI operationon_errorVoltage signal Verror, the following institute of corresponding relationship Show:
Wherein, by adjusting resistance R5、R6With capacitor C1It can change the proportionality coefficient and integral coefficient of pi regulator；
3) divider circuit calculates variable turn-on time in real time, and exports corresponding real-time variable turn-on time Ton_vary(t) Voltage signal Vadd, the expression formula of the voltage signal is as follows:
Resistance in circuit is determined according to following equation:
Then voltage signal VaddCorresponding real-time variable turn-on time Ton_vary(t) corresponding relationship is as follows:
Wherein, KMIt is the gain coefficient of multiplier, dusaw/ dt is the slope of sawtooth voltage signal, ZrIt is characteristic impedance:L is the boost inductance value in CRM boost PFC inverter main circuit, CossIt is the output of switching tube Junction capacitance, CdpIt is the parasitic capacitance value of diode；
4) by differential amplifier circuit, by voltage signal VerrorAnd VaddComparison voltage needed for being converted to modulation wave signal Value Vcompare, that is, have:
Comparing voltage value VcompareWith turn-on time Ton(t) corresponding relationship is as follows:
5) rising edge signal of the square-wave signal of rest-set flip-flop detection inductive current zero cross detection circuit output confirms switch Pipe turn-on instant.The comparing voltage value V of modulation wave signal comparator positive and negative terminalcompareIt is handed over sawtooth voltage signal and cuts determining open It closes pipe and turns off the moment.After switching tube is opened, sawtooth signal is started from scratch linearly increasing until and VcompareIt is defeated when equal Switching tube cut-off signals out complete the variation turn-on time control of CRM boost PFC converter.
Variation turn-on time control for CRM boost PFC converter, the turn-on time T that the present invention useson(t) Calculating process be it is unified, avoid and needed in traditional control method according to input voltage below or above 1/2 output voltage It carries out Discrete control and is achieved using different hardware simulation circuits, system cost degree can be significantly reduced and control is difficult Degree, meet while guaranteeing lower input current THD CRM boost PFC converter it is simple to control circuit, it is reliable and it is low at This growth requirement.
Embodiment two: realize that CRM Boost pfc converter becomes turn-on time based on TMS320F28335 digitial controller The turn-on time operation of control optimizes unified digital control method
Fig. 1 is the main circuit of CRM boost PFC converter, including electromagnetic interface filter, rectifier bridge, input capacitance, boosting electricity Sense, switching tube, diode, output capacitance and load.The circuit parameter of CRM boost PFC converter used in example are as follows: Boost inductance value L=230uH, the parasitic capacitance capacitance C of power deviceoss+Cdp=80pF.Test condition are as follows: line frequency 50Hz, AC-input voltage 110V and 220V export busbar voltage 400V, are fully loaded with output power 200W.This example exists respectively 20%, constant on-time control is compared in the case where 40%, 50%, 60%, 80% and 100% load to input current THD It is tested.
Fig. 3 is the digital control circuit figure realizing optimization and being uniformly controlled, except main circuit increases voltage sampling circuit, inductance Current over-zero detection circuit, driving circuit and modulation wave signal generation circuit.
The present invention is based on the control processes of TMS320F28335 digitial controller as shown in the control flow chart of Fig. 4:
1) ADC module of digitial controller, ePWM module, eCAP module and voltage PI ring are initialized, and take input electricity Press downsampling factor KinIt is 125, output voltage downsampling factor KoIt is 160, reference voltage VrefIt is removed for the control target value of output voltage With output voltage downsampling factor, i.e. VrefIt is 230 μ H, characteristic impedance for 2.5V, constant boost inductance value L
2) digitial controller responds ADC interrupt routine, to output voltage VoWith input voltage vinIt is sampled, is divided Actual sample value V afterwardso/KoAnd vin/Kin；
3) Voltage loop proportional, integral compensation program is called to calculate error turn-on time Ton_error:
Ton_error=T'on_error+Kp×(ΔV-ΔV')+Ki×ΔV (17)
Wherein, KpIt is the proportionality coefficient of voltage PI ring, KiIt is the integral coefficient of voltage PI ring, Δ V is this period output voltage Sampled value Vo/KoWith reference voltage VrefError amount, Δ V' is upper a cycle output voltage sampled value Vo/KoWith reference voltage VrefError amount, Ton_errorIt is the calculated result of this periodic voltage PI ring, T 'on_errorIt is the calculating of last periodic voltage PI ring As a result；
4) variable turn-on time T is calculated in real timeon_vary(t):
5) by error turn-on time Ton_errorWith real-time variable turn-on time Ton_vary(t) it is added, obtains work at present item Corresponding turn-on time T under parton(t):
Ton(t)=Ton_error+Ton_vary(t) (19)
6) the rising edge letter of the square-wave signal of digitial controller eCAP module capture inductive current zero cross detection circuit output Number, determine the switching tube in CRM boost PFC inverter main circuit opens the moment；
7) digitial controller ePWM module is by corresponding turn-on time Ton(t) PWM wave signal is converted to export to driving electricity Road, driving signal needed for generating variation turn-on time control；
8) step 2)~7 are repeated).
Fig. 6 is that constant on-time control and variation turn-on time of the invention is respectively adopted in CRM boost PFC converter Control the comparison diagram that the input current THD in 110V and 220V AC-input voltage changes with output power.
As can be seen that the optimal control of variation turn-on time proposed by the invention, loads 20% from comparison diagram When, the THD of CRM boost PFC converter input current can be down to 2.64% from 18.38%, significantly improve input electricity The case where stream distortion.
The simulation result shows: the optimal control that CRM boost PFC converter proposed by the invention becomes turn-on time exists Avoiding in traditional control method while significantly reducing input current THD needs to vinMore than or less than Vo/ 2 two kinds are not sympathized with Condition carry out classification control complexity problem, thus meet CRM boost PFC converter it is simple to control circuit, it is reliable with it is low The growth requirement of cost.
Embodiment three: when controlling the conducting for realizing the change turn-on time control of CRM boost PFC converter by analog circuit Between operation optimization it is unified
Fig. 1 is the main circuit of CRM boost PFC converter, including electromagnetic interface filter, rectifier bridge, input capacitance, boosting electricity Sense, switching tube, diode, output capacitance and load.The circuit parameter of CRM boost PFC converter used in example are as follows: Boost inductance value L=230 μ H, the parasitic capacitance capacitance C of power deviceoss+Cdp=80pF, the gain coefficient K of multiplierMFor 0.1/V.Test condition are as follows: line frequency 50Hz, AC-input voltage 110V and 220V export busbar voltage 400V, be fully loaded with defeated Power 200W out.
Fig. 5 realizes that CRM boost PFC converter becomes the turn-on time operation of turn-on time control using analog control method The unified schematic diagram of optimization, including voltage sampling circuit, inductive current zero cross detection circuit, driving circuit, pi regulator electricity Road, divider circuit and differential amplifier circuit.
It is as follows that the present invention simulates control process:
1) input and output voltage sample circuit is by sampled value Vo/KoAnd vin/KinIt is sent respectively to pi regulator and divider electricity Lu Zhong, wherein the partial pressure COEFFICIENT K of input voltage sample circuitinIt is 30, the partial pressure COEFFICIENT K of output voltage sampling circuitoIt is 200, Reference voltage value Vref=400/200=2V；
2) pi regulator circuit is by output voltage sampled value Vo/KoWith reference voltage value VrefIt compares to obtain voltage error Value, and corresponding error turn-on time T is exported by simulation PI operationon_errorVoltage signal Verror.Wherein, by adjusting electricity Hinder R5、R6With capacitor C1It can change the proportionality coefficient and integral coefficient of pi regulator；
3) divider circuit calculates variable turn-on time in real time, and exports corresponding real-time variable turn-on time Ton_vary(t) Voltage signal Vadd, which meets following expression:
Wherein, the gain coefficient K of multiplierMFor 0.1/V；
4) by differential amplifier circuit, by voltage signal VerrorAnd VaddComparison voltage needed for being converted to modulation wave signal Value Vcompare, that is, have:
Comparing voltage value VcompareCorresponding turn-on time TonExpression formula it is as follows:
Wherein, the slope du of sawtooth voltage signalsaw/ dt is 1V/ μ s, can use R9=10k Ω, R10=1k Ω, and can be with The resistance R in divider circuit is determined by following equation7And R8:
It then can use resistance R7=11k Ω, R8=10k Ω；
5) rising edge signal of the square-wave signal of rest-set flip-flop detection inductive current zero cross detection circuit output confirms switch Pipe turn-on instant.The comparing voltage value V of modulation wave signal comparator positive and negative terminalcompareIt is handed over sawtooth voltage signal and cuts determining open It closes pipe and turns off the moment.After switching tube is opened, sawtooth signal is started from scratch linearly increasing until and VcompareIt is defeated when equal Switching tube cut-off signals out complete the optimization system that CRM boost PFC converter becomes the turn-on time operation of turn-on time control One.
The method of the present invention does not need to carry out the measurement of power detection and input voltage virtual value, converts in CRM boost PFC Under the conditions of any in device working range, switching tube turn-on time Ton(t) calculating process is all consistent, to reduce fortune Calculate complexity and system cost.

Claims (3)

1. a kind of realization circuit of CRM boost PFC converter variation turn-on time optimal control, including CRM boost PFC become Parallel operation main circuit and control circuit, it is characterised in that: the control circuit samples electricity by input voltage sample circuit, output voltage Road, inductive current zero-crossing detector and analog control circuit are constituted；The analog control circuit includes pi regulator, divider electricity Road and differential amplifier circuit；
Wherein, the CRM boost PFC inverter main circuit by electromagnetic interface filter, rectifier bridge, input capacitance, inductance, switching tube, Diode, output capacitance and load are constituted；Input capacitance on rear side of the input terminal connection rectifier bridge of the input voltage sample circuit Both ends, output end connect divider circuit in multiplier input terminal；The input terminal of the output voltage sampling circuit The both ends of output loading are connected, output end is respectively connected to amplifier OP by resistance1With amplifier OP2Inverting input terminal；Amplifier OP1Inverting input terminal connection output voltage sampling circuit divider resistance R3With R4Between sampled output, positive input Connect reference voltage Vref, output signal VerrorIt is connected to amplifier OP3Positive input；The multiplier of the divider circuit Input terminal be separately connected the divider resistance R of input voltage sample circuit1With R2Between sampled output and amplifier OP2It is defeated Outlet, output end pass through resistance R8Connect amplifier OP2Inverting input terminal, amplifier OP2Inverting input terminal pass through resistance R7Even Meet the divider resistance R of output voltage sampling circuit3With R4Between sampled output, positive input connect Power Groud, output letter Number VaddPass through resistance R9Connect amplifier OP3Inverting input terminal；Amplifier OP3Output signal VcompareIt is connected to amplifier OP4It is anti- Phase input terminal；Amplifier OP4Input terminal be separately connected amplifier OP3Output signal VcompareAnd sawtooth-wave circuit, output end are Shutdown trigger signal and the input terminal R for being connected to rest-set flip-flop；The output of inductive current zero-crossing detector opens trigger signal to RS The input terminal S of trigger；For rest-set flip-flop when input terminal R is low level and S is high level, output end Q exports high level to drive Dynamic circuit, when input terminal R is high level and S is low level, output end Q exports low level to driving circuit.
2. CRM boost PFC converter as described in claim 1 changes turn-on time optimal control method, it is characterised in that: Under the conditions of any in CRM boost PFC converter working range, turn-on time Ton(t) steps are as follows for calculating process:
1) to turn-on time Ton(t) constant component Ton_errorIt is calculated, which is adjusted by voltage PI ring, for controlling The output power and output voltage of converter processed；
2) to turn-on time Ton(t) variable part Ton_vary(t) it is calculated, which is used in converter input voltage mistake Zero increases the turn-on time of switching tube additionally nearby to improve input current abnormality, and quantitative relationship is as follows:
Wherein, ZrIt is characteristic impedance,L is the boosting electricity in CRM boost PFC inverter main circuit Inductance value, CossIt is the output junction capacitance of switching tube, CdpIt is the parasitic capacitance value of diode, vinIt is input voltage instantaneous value, VoIt is Output voltage instantaneous value, input voltage vinMore than or less than output voltage Vo/2；
3) by turn-on time Ton(t) constant component Ton_errorWith turn-on time Ton(t) variable part Ton_vary(t) it is added, Obtain corresponding turn-on time T under current operating conditionson(t), it is shown below:
Ton(t)=Ton_error+Ton_vary(t) (2)
4) by corresponding turn-on time Ton(t) driving signal is converted to, realizes that the variation to CRM boost PFC converter is connected Time control.
3. optimal control method as claimed in claim 2, is realized through digitial controller, which comprises the steps of:
1) the input electricity at the input capacitance both ends on rear side of the analog/digital conversion unit sampling converter rectifier bridge of digitial controller Press vinWith the output voltage V at load both endso, obtain corresponding sample magnitude vin/KinWith Vo/Ko, KinIt is input voltage sampling electricity The partial pressure coefficient on road, KoIt is the partial pressure coefficient of output voltage sampling circuit；
2) output voltage sampled value Vo/KoWith reference voltage VrefIt is compared in interruption system, error amount △ V is through overvoltage Turn-on time T is generated after PI ring operationon(t) constant component Ton_error；Wherein, reference voltage VrefFor the control of output voltage Target value processed divides coefficient divided by output voltage, takes 1~3V；
3) operation processing unit of digitial controller is according to the following formula to turn-on time Ton(t) variable part Ton_vary(t) It is calculated in real time:
Wherein, ZrIt is characteristic impedance:L is the boosting electricity in CRM boost PFC inverter main circuit Inductance value, CossIt is the output junction capacitance of switching tube, CdpIt is the parasitic capacitance value of diode；
4) by turn-on time Ton(t) constant component Ton_errorWith turn-on time Ton(t) variable part Ton_vary(t) phase Add, obtains corresponding turn-on time T under current operating conditionson(t), it is shown below:
Ton(t)=Ton_error+Ton_vary(t) (4)
5) rising edge signal of the square-wave signal of digitial controller eCAP module capture inductive current zero-crossing detector output, determines Switching tube in CRM boost PFC inverter main circuit opens the moment；
6) digitial controller ePWM module is by corresponding turn-on time Ton(t) it is converted to PWM wave signal to export to driving circuit, produce Driving signal needed for the control of changing turn-on time.
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