CN109756101A - A kind of voltage-type AOT control Buck compensation bis- times of working frequency ripple wave devices of Flyback PFC - Google Patents
A kind of voltage-type AOT control Buck compensation bis- times of working frequency ripple wave devices of Flyback PFC Download PDFInfo
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- CN109756101A CN109756101A CN201910083517.4A CN201910083517A CN109756101A CN 109756101 A CN109756101 A CN 109756101A CN 201910083517 A CN201910083517 A CN 201910083517A CN 109756101 A CN109756101 A CN 109756101A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The present invention discloses a kind of voltage-type AOT control Buck compensation bis- times of working frequency ripple wave devices of Flyback PFC, including flyback converter and Buck converter；AC-input voltage accesses the input winding of flyback converter after EMI and rectifier bridge；The output winding of flyback converter includes main power winding, auxiliary winding and zero current detection winding；The input winding and main power winding coupled, auxiliary winding and zero current detection winding coupled；The direct current output capacitor of auxiliary windingC 2It is in parallel with the input terminal of Buck converter；The direct current output capacitor of main power windingC 1With the output capacitance of Buck converterC bIn parallel with load R again after series connection, the output voltage by controlling Buck converter realizes output ripple and low and fast dynamic response.The present invention can effectively eliminate two times of working frequency ripple wave voltages in output voltage, and can be realized quick dynamic responding speed.
Description
Technical field
The present invention relates to switch variable power source technical field, specially a kind of voltage-type AOT control Buck compensates Flyback
Bis- times of working frequency ripple wave devices of PFC.
Background technique
In recent years, the fast development of power electronic technique, in field of power electronics power technology application and research by
Gradually become hot spot.Variable power source is switched with its high efficiency, the advantage of high power density establishes dominant position in field of power supplies, but
It has a serious problem when accessing power grid by rectifier: power factor is lower (being typically only 0.45 ~ 0.75), due to function
The low problem of rate factor can generate a large amount of current harmonics and reactive power in power grid to pollute power grid.Therefore must draw
Enter PFC (Power Factor Correction, PFC) technology.Whether had according to power factor correction technology
Source device, pfc circuit can be divided into passive and active two ways.Passive PFC technology is without active component, circuit is simple, at
This is low, high reliablity, electromagnetic interference are small, but passive PFC technology is just for the harmonic wave of fixed frequency, and working performance and input
Electric voltage frequency, load variation and input voltage variation are all related, and filter inductance volume is big, and weight is big.Active PFC technology is adopted
With the switch converters containing power switch tube, makes input current that the shape of sine wave be presented and keep same phase with input voltage
Position, to realize the function of PFC.
But due to the imbalance between the pulsation and constant output of transient state input power, result in pfc converter
Output voltage/electric current contain biggish two times of working frequency ripple wave components, and pfc converter causes it dynamic due to its narrow bandwidth
State response speed is slow, and the mutation of load can not be made and timely adjusted, therefore for needing the power supply of high power quality to set
For standby, common pfc converter is unable to satisfy its demand.In order to reduce its output voltage/electric current ripple, pfc converter is logical
DC/DC converter often is cascaded in rear class, stable voltage/current is exported by late-class circuit, and can be for load sudden change
Situation, which is made, timely to be handled.But the pfc converter of two-stage cascade not only needs very big capacitor, and energy becomes by two-stage
It changes, therefore its volume is larger, power density is not high, and transfer efficiency is low, these are all unfavorable for answering for the PFC technology of two-stage cascade
With.
Summary of the invention
In view of the above-mentioned problems, the purpose of the present invention is to provide a kind of two effectively eliminated in output voltage times working frequency ripple waves
Voltage, and can be realized voltage-type AOT control Buck compensation bis- times of power frequency lines of Flyback PFC of quick dynamic responding speed
Wave apparatus.Technical solution is as follows:
A kind of voltage-type AOT control Buck compensation bis- times of working frequency ripple wave devices of Flyback PFC, including flyback converter and Buck
Converter；AC-input voltage accesses the input winding of flyback converter after EMI and rectifier bridge；The output of flyback converter
Winding includes main power winding, auxiliary winding and zero current detection winding；The input winding and main power winding, auxiliary winding
With zero current detection winding coupled；The direct current output capacitor of auxiliary windingC 2It is in parallel with the input terminal of Buck converter；Main power
The direct current output capacitor of windingC 1With the output capacitance of Buck converterC bIt is in parallel with load R again after series connection, become by control Buck
The output voltage of parallel operation realizes output ripple and low and fast dynamic response.
It further, further include the controller of flyback converter, the controller of the flyback converter includes for detecting
Main power direct current output capacitanceC 1The secondary frontier inspection slowdown monitoring circuit of voltage, the voltage signal detectedv o1With reference voltageV ref2Point
It is not input to comparator Co0Backward end and forward end, comparator Co0The error signal of output obtains secondary side after operation amplifier
Error signalu c, secondary edge error signalu cPrimary side, which is transmitted to, by optocoupler generates primary side error signalu comp, primary side error signalu compIt is input to comparator Co in pwm pulse generation circuit1Backward end, saw-toothed wave generator generate sawtooth signal input
To comparator Co1Forward end；Comparator Co1Output end be connected to the end R of the first rest-set flip-flop, the end Q of the first rest-set flip-flop
The switching tube S being connected at flyback converter input winding1Grid；The zero current detection winding is connected through zero-crossing detector
To the end S of the first rest-set flip-flop.
It further, further include the controller of Buck converter, the controller of the Buck converter includes for examining
Survey the secondary frontier inspection slowdown monitoring circuit of voltage signal on load R, the voltage signal detectedv oWith reference voltage signalV ref1It is separately input to
Comparator Co2Backward end and forward end, comparator Co2Output end be connected to the end S of the second rest-set flip-flop；2nd RS triggering
The end Q of device is connected to the switching tube S of auxiliary winding output endbGrid, the non-end Q is connected to the switch S in AOT controllert；AOT
The comparator Co of controller3Output end be connected to the end R of the second rest-set flip-flop；CapacitorC tWith switch StIt is parallel to AOT controller
Controlled current sourcegv o2Output end, controlled current sourcegv o2Output voltageV ctAnd predeterminated voltageV thIt is separately input to compare
Device Co3Backward end and forward end.
The beneficial effects of the present invention are:
1) compared with existing Simulating of Single Phase Power-Factor-Correction Converter, the single-phase three winding Flyback PFC of use becomes the present invention
When parallel operation works in stable state, it is effectively reduced the DC output voltage ripple of load, also effectively reduces rectifying and wave-filtering electricity
The output capacitance on road；
2) for the present invention compared with existing Simulating of Single Phase Power-Factor-Correction Converter, series compensation type power factor correcting converter can
With the cutoff frequency of height-adjusting system output voltage feedback control loop, when loading mutation, the Buck converter of AOT control
It can rapidly make accordingly, the transient response speed of converter is turned up；
3) the AOT control that the present invention uses simplifies the design of control loop, and it is not only inherited without loop compensation
The advantages that transient response speed of COT control is fast remains unchanged switching frequency in input voltage transformation, substantially reduces
The range of switching frequency variation；
4) the AOT control that the present invention uses inherits the various advantages of COT control, therefore it can also be such that converter is dropping at light load
Low switching frequency reduces switching loss, the efficiency of lifting system.
Detailed description of the invention
Fig. 1 is system structure diagram of the invention.
Fig. 2 is circuit topology figure of the invention and control strategy figure.
Fig. 3 is main output voltage waveforms schematic diagram of the invention.
Fig. 4 is the input voltage input current waveform and primary current and secondary current of the invention under CRM mode
Waveform.
Fig. 5 is the time-domain-simulation waveform of main output voltage of the invention.
Fig. 6 is present invention time-domain-simulation waveform of output voltage and output electric current in load sudden change.
In Fig. 4: (a) being input voltage waveform, input current waveform and PF value；It (b) is primary current and secondary current
Waveform.
Specific embodiment
The present invention is described in further details in the following with reference to the drawings and specific embodiments.Fig. 1, which gives, of the invention is
System block diagram, exchange inputV acFlyback converter is accessed by EMI and rectifier bridge.The output winding of Flybac converter includes
Main power winding, auxiliary winding and zero current detection winding；The input winding and main power winding, auxiliary winding and zero current
Detection winding coupling.The direct current output capacitor of the main power winding of Flyback pfc converterC 1Upper end and load R upper end
Connection, the direct current output capacitor of auxiliary windingC 2Output end it is in parallel with the input terminal of Buck converter, Buck converter it is defeated
Capacitor outC bUpper end withC 1Lower end connection,C bLower end with load R lower end connect, while load R lower end be grounded.It is logical
The output voltage for crossing control Buck converter realizes output ripple and low and fast dynamic response.
Fig. 2 gives circuit topology and control block diagram of the invention.Controller including the flyback converter and
The controller of Buck converter.
The controller of flyback converter includes for detecting main power direct current output capacitanceC 1The secondary frontier inspection of voltage is surveyed
Circuit, the voltage signal detectedv o1With reference voltageV ref2It is separately input to comparator Co0Backward end and forward end, compare
Device Co0The error signal of output obtains secondary edge error signal after operation amplifieru c, secondary edge error signalu cIt is transmitted to by optocoupler
Primary side generates primary side error signalu comp, primary side error signalu compIt is input to comparator Co in pwm pulse generation circuit1It is anti-
Xiang Duan, the sawtooth signal that saw-toothed wave generator generates are input to comparator Co1Forward end；Comparator Co1Output end connection
To the end R of the first rest-set flip-flop, the end Q of the first rest-set flip-flop is connected to the switching tube S at flyback converter input winding1Grid
Pole；The zero current detection winding is connected to the end S of the first rest-set flip-flop through zero-crossing detector.
The specific course of work and principle are as follows: flyback converter is controlled using univoltage ring, passes through secondary frontier inspection slowdown monitoring circuit
Detect the output capacitance on main power windingC 1Voltage, obtain signalv o1, by signalv o1With reference voltageV ref2Through comparator
Co0The error signal obtained afterwards obtains secondary edge error signal after operation amplifieru c, secondary edge error signal is transmitted to by optocoupler
Primary side generates primary side error signalu comp, generationu compAs comparator Co in pwm pulse generation circuit1Backward end input,
Comparator Co in pwm pulse generation circuit1Forward end input signal be saw-toothed wave generator sawtooth signal.At each
Switch periods start time, switching tube S1Conducting, primary side current of transformeri inIt begins to ramp up, transformer storage energy.When PWM arteries and veins
When the positive end signal rushed in generation circuit is greater than reversed end signal, i.e., when sawtooth signal is greater than error signalu compWhenQ 1It closes
Disconnected, transformer transmits energy to secondary side.When zero-crossing detector detects the current over-zero on zero current detection winding, that is, detect
It arrivesu zcdWhen signal, start next cycle, thus make flyback converter work in CRM mode, and realize power factor controlling and
Output voltage control.
The controller of Buck converter includes the secondary frontier inspection slowdown monitoring circuit for detecting voltage signal on load R, is detected
Voltage signalv oWith reference voltage signalV ref1It is separately input to comparator Co2Backward end and forward end, comparator Co2It is defeated
Outlet is connected to the end S of the second rest-set flip-flop；The end Q of second rest-set flip-flop is connected to the switching tube S of auxiliary winding output endb's
Grid, the non-end Q are connected to the switch S in AOT controllert；The comparator Co of AOT controller3Output end be connected to the 2nd RS touching
Send out the end R of device；CapacitorC tWith switch StIt is parallel to the controlled current source of AOT controllergv o2Output end, controlled current sourcegv o2
Output voltageV ctAnd predeterminated voltageV thIt is separately input to comparator Co3Backward end and forward end.
The specific course of work and principle are as follows: Buck converter is controlled using AOT technology with compensate main power around
Two times of working frequency ripple wave voltages in group output capacitance.In each switch periods start time, switching tube SbShutdown, passes through secondary side
Voltage on detection circuit detection load R obtains signalv o, by signalv oWith reference voltage signalV ref1It is compared, works as benchmark
Voltage signalV ref1Greater than sampled signalv oWhen, comparator Co2High level is exported, rest-set flip-flop set is made, the end Q exports high level,
Make switching tube SbConducting, output voltage rise, and the non-end Q exports low level, make the switch S of AOT controllertShutdown, controlled current sourcegv o2To capacitorC tCharging, works as capacitorC tOn voltage be greater than preset valueV thWhen, comparator Co3Output high level makes rest-set flip-flop
It resets, the end Q exports low level, on-off switching tube Sb, output voltage decline, work as sampled signalv oIt is re-lowered to reference voltage letter
NumberV ref2When, start next cycle.Because of controlled sourcegv o2With the input voltage of Buck converterv o2Correlation, therefore can disappear
The control of adaptive turn-on time is realized in influence when except the variation of Buck converter input voltage to switching frequency with this.By with
On working method can make Buck converter export one with main power winding output capacitanceC 1Two times of power frequencies in voltage
The opposite voltage of ripple voltage amplitude same phase, with this come eliminate load on two times of working frequency ripple wave voltages, make output voltagev oFor the DC voltage of ripple very little, to realize control of the output voltage stabilization near reference voltage.
Analysis of simulation result:
Simulated conditions: input voltageV acIt is 110V for virtual value, frequency is the AC-input voltage of 50HZ.Output voltageV o=V ref
=48V, load R are 46 Ω, transformer turns ratio 30:12:8, static exciter inductanceL m=220uH, leakage inductance are respectively 3uH,
1.8uHC 1=220uF,C 2=220uF,C b=47uF,L b=50uH；AOT controller parameter isg=1/1300,Ct=20nF,V th=1V。
Fig. 4 gives the waveform and its PF of the input voltage of CRM mode flyback pfc converter and input current in the present invention
The waveform of value and primary current and secondary current.Wherein (a) is the waveform of input voltage and input current, it can be seen that defeated
Enter voltage input and current same-phase, PF value is 99.01.Scheming (b) is primary currenti inWith secondary currenti d1Waveform, can see
It is operate under CRM mode to flyback pfc converter, it is seen that the solution of the present invention meets design requirement.
Fig. 5, which gives, uses PSIM software to present invention progress time-domain-simulation as a result, horizontal axis is the time (s), and the longitudinal axis is
Voltage magnitude (V).Output voltage as seen from Figure 5v oIn stable state by output voltagev o1With output voltagev bSuperposition and produce
It is raw.It can be seen that eliminating two times of working frequency ripple wave voltages on output voltage under the action of series compensation circuit.Buck transformation
Device eliminates two times of working frequency ripple wave voltages on main power winding output capacitance C1 under the action of AOT is controlled, and makes in load
Output voltage Vo is rendered as the DC quantity without two times of working frequency ripple wave voltage.And as can be seen that mending from output voltage ripple
Output voltage ripple maximum value after repaying is only 30mV, only accounts for the 0.0625% of output voltage.It can prove the solution of the present invention energy
Enough two times of working frequency ripple wave voltages of output for eliminating flyback pfc converter well.
Fig. 6 gives the time-domain simulation results for carrying out load jump experiment to the present invention using PSIM software.It can from figure
Jump to 92 Ω from 46 Ω when being supported on to see 0.35 second, the output voltage in load without significant change, although main power around
GroupC 1On output voltagev o1Variation is more big, but can be by the output voltage of Buck converterv bIt is compensated, at 0.4 second
When load from 92 Ω jump to 46 Ω, the output voltage in load is also without any significant change, output voltagev o1It can be byv b
It is compensated.It can be seen that the invention using AOT control Buck compensation bis- times of working frequency ripple wave voltage of Flyback PFC has quickly dynamic
Response speed and broader output voltage control loop bandwidth.
Claims (3)
1. a kind of voltage-type AOT control Buck compensates bis- times of working frequency ripple wave devices of Flyback PFC, which is characterized in that including anti-
Exciting converter and Buck converter；AC-input voltage accesses the input winding of flyback converter after EMI and rectifier bridge；Instead
The output winding of exciting converter includes main power winding, auxiliary winding and zero current detection winding；The input winding and main function
Rate winding, auxiliary winding and zero current detection winding coupled；The direct current output capacitor of auxiliary windingC 2It is defeated with Buck converter
It is in parallel to enter end；The direct current output capacitor of main power windingC 1With the output capacitance of Buck converterC bAfter series connection again with load R simultaneously
Connection, the output voltage by controlling Buck converter realize output ripple and low and fast dynamic response.
2. voltage-type AOT control Buck according to claim 1 compensates bis- times of working frequency ripple wave devices of Flyback PFC,
It is characterized in that, further includes the controller of the flyback converter, the controller of the flyback converter includes for detecting main function
Rate direct current output capacitanceC 1The secondary frontier inspection slowdown monitoring circuit of voltage, the voltage signal detectedv o1With reference voltageV ref2It is defeated respectively
Enter to comparator Co0Backward end and forward end, comparator Co0The error signal of output obtains secondary edge error after operation amplifier
Signalu c, secondary edge error signalu cPrimary side, which is transmitted to, by optocoupler generates primary side error signalu comp, primary side error signalu compIt is defeated
Enter into pwm pulse generation circuit comparator Co1Backward end, the sawtooth signal that saw-toothed wave generator generates is input to and compares
Device Co1Forward end；Comparator Co1Output end be connected to the end R of the first rest-set flip-flop, the end Q of the first rest-set flip-flop is connected to
Flyback converter inputs the switching tube S at winding1Grid；The zero current detection winding is connected to first through zero-crossing detector
The end S of rest-set flip-flop.
3. voltage-type AOT control Buck according to claim 2 compensates bis- times of working frequency ripple wave devices of Flyback PFC,
It is characterized in that, further includes the controller of Buck converter, the controller of the Buck converter includes powering on for detecting load R
Press the secondary frontier inspection slowdown monitoring circuit of signal, the voltage signal detectedv oWith reference voltage signalV ref1It is separately input to comparator Co2's
Backward end and forward end, comparator Co2Output end be connected to the end S of the second rest-set flip-flop；The end Q of second rest-set flip-flop connects
To the switching tube S of auxiliary winding output endbGrid, the non-end Q is connected to the switch S in AOT controllert；The ratio of AOT controller
Compared with device Co3Output end be connected to the end R of the second rest-set flip-flop；CapacitorC tWith switch StIt is parallel to the controlled current flow of AOT controller
Sourcegv o2Output end, controlled current sourcegv o2Output voltageV ctAnd predeterminated voltageV thIt is separately input to comparator Co3It is reversed
End and forward end.
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| CN112737344A (en) * | 2020-12-29 | 2021-04-30 | 联合汽车电子有限公司 | Battery charging circuit |
| CN117595644A (en) * | 2024-01-18 | 2024-02-23 | 武汉理工大学 | Electrolytic capacitor-free V2G converter based on ripple reverse compensation |
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