CN106100373B - The high frequency CRM boost PFC converters of adaptive optimization THD - Google Patents
The high frequency CRM boost PFC converters of adaptive optimization THD Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- 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
- H02M1/4225—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
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4241—Arrangements for improving power factor of AC input using a resonant 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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0012—Control circuits using digital or numerical techniques
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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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- Dc-Dc Converters (AREA)
Abstract
The present invention provides a kind of high frequency CRM Boost pfc converters of adaptive optimization input current THD, belongs to AC DC power conversion fields.It, which is based on variation turn-on time control mode, reduces input current THD：Modulation wave signal is generated using digital lookup table mode, variation turn-on time control is realized by preset turn-on time tables of data, to solve the problems, such as that analog control mode control accuracy difference and digital calculation in real time are of high cost；Other circuits in addition to modulation wave signal generation circuit are realized by analog form, to overcome digitial controller limited to MHz high-frequency signal response speeds insufficient and reduce the performance requirement to digitial controller；By being converted to finite data preset in tables of data, variation turn-on time control can be realized without output power detection, input voltage, output power is followed to carry out automatic adjusument, to adaptive optimization input current THD, and significantly reduce system cost.
Description
Technical field
The present invention relates to it is a kind of can adaptive optimization input current THD high frequency CRM Boost pfc converters, belong to work(
Rate converter technique range, more particularly to high quality AC-DC power conversions and HF power conversion technical field.
Background technology
Power electronic equipment causes the harmonic content of power network current to be significantly increased simultaneously serious in the extensive use of rectification occasion
Endanger the normal table operation of power grid.The main harm of harmonic current is as follows：Pressure drop is generated in transmission line of electricity impedance, leads to electricity
Non- " sine " of net voltage waveform is changed；The easily normal work of the neighbouring electrical equipment of interference, cause electronic equipment, instrument and meter and
The mistake of line protective devices etc. is measured, is malfunctioned；Increase added losses and the temperature liter etc. of power network line.Power electronics fills in recent years
Harmonic pollution problems cause increasingly extensive concern caused by setting.Harmonic pollution caused by reduce power electronic equipment improves
The power quality of power grid, International Electrotechnical Commission promulgate and have revised IEC61000-3-2, the harmonic standards such as IEC555-2, to each
The harmonic standard reached needed for class electrical equipment has carried out unified specific regulation.PFC (Power Factor
Correction, PFC) technology can be improved load-side power factor, reduce input harmonic current, have become all kinds of electrical equipments
To reach technological means necessary to relevant harmonic standard.Fairing using PFC technologies is known as pfc converter.PFC is converted
Device can be divided into two kinds of passive pfc converter and active PFC converter.Passive pfc converter is using passive devices such as inductance, capacitances
Harmonic current is filtered out, realization is simple, at low cost, but device volume is big, weight weight, has to the inhibition of input harmonic current
Limit；Active PFC converter, which can be realized, to be controlled the sineization of input current waveform and keeps it identical as input voltage phase, is filled
It sets small, light-weight, excellent to the inhibition of input harmonic current.With the requirement day to electrical equipment low harmony wave performance
Benefit improves, and active PFC converter is widely used.
Single-phase step-up type (Boost) pfc converter small, inhibition energy to conducted EMI with input current ripple
The advantages that power is strong, driving design is simple, becomes the prevailing topology of Single-phase PFC converter.The main electricity of single phase boost pfc converter
It route the compositions such as electromagnetic interface filter, rectifier bridge, input capacitance, boost inductance, switching tube, diode, output capacitance.Pursue Gao Gong
Rate density is the development trend of active PFC converter of new generation, and it is that it realizes that high power is close to improve efficiency with switching frequency is improved
Spend indispensable technological means.Critical continuous conduction mode (Critical Continuous Mode, CRM) Boost PFC transformation
Device has become the potentiality object that middle low power occasion Boost pfc converters develop to efficient, high frequency and high power density direction,
Its main advantage has：
1. the Sofe Switch of power device can be realized, including the no-voltage of main switch is opened or Valley-Switching and diode
Zero-current switching, it is the low, Wen Sheng little of devices switch loss, efficient；
2. (turn-on time of switching tube keeps permanent to the control mode of use constant on-time in two times of power frequency periods
It is fixed), and outer voltage control is only needed, design is simple, is easily achieved, is at low cost.
The realization of power device Sofe Switch has benefited from boost inductance and power in main circuit in CRM Boost pfc converters
Resonant process between device parasitic capacitance (the equivalent parallel capacitance etc. for including the output junction capacity of switching tube and diode).But
In Sofe Switch resonant process, the electric current of boost inductance can reversely flow into the input capacitance on rear side of rectifier bridge so that switch periods
Duration increases, inductive current forward direction amplitude reduces, therefore the current average of boost inductance cannot track sinusoidal input voltage,
The total harmonic distortion content of input current Zero-crossing Distortion, input current (Total Harmonics Distortion, THD) is caused to increase
Add.As CRM Boost pfc converter switching frequencies improve, switch periods duration reduces, boost inductor current reverse flow
Negative effect more highlight, Sofe Switch resonant process causes input current that more obvious Zero-crossing Distortion, input current occurs
THD will be dramatically increased, and cannot reach the requirement of relevant harmonic standard, to limit high frequency CRM Boost pfc converters
Using.To improve the THD performances of CRM Boost pfc converter input currents, change the control mode (switching tube of turn-on time
Turn-on time followed in two times of power frequency periods input voltage synchronize variation) be used, boost to increase in switch periods
The positive amplitude of inductive current compensates the boost inductor current average value reduced by Sofe Switch resonant process, makes the defeated of converter
Enter electric current sineization in power frequency period.In changing turn-on time control mode, changing rule and the input electricity of turn-on time
Pressure and loading condition (or output power) while related.
For CRM Boost pfc converters, changing the control of turn-on time can be given by analog form or digital form
To realize.CRM Boost PFC control transient state amplitudes of the chip by real-time sampling input voltage based on analog form, and
Input voltage zero passage is additional nearby to increase turn-on time, to realize the control of variation turn-on time.Analog form design is simple,
It is easily achieved；But the high frequency CRM Boost pfc converters that can not be suitable for working under wide input voltage, wide loading condition,
The reason is as follows that：
1. additional increased turn-on time only follows the instantaneous value of input voltage to synchronize variation, does not establish and close with output power
System, therefore optimal variation turn-on time control is can not achieve, to the improvement of input current THD performances under different output power
Function and effect are totally different or even cannot take into account；
It accurately quantitatively calculates, is only capable of within the scope of converter operating condition 2. the acquisition for additionally increasing turn-on time lacks
Realize preferably input current THD performances under a certain specific input voltage and a certain specific output power, therefore control circuit
Component parameters need to input (different input voltages and different output powers) under the conditions of different operating within the scope of operating condition
Electric current THD performances carry out compromise selection after carrying out contrast test, increase design cycle and complexity；
3. the switching frequency of actually required variation turn-on time and converter is closely related, existing commercial simulation control
Chip institute additionally only can be suitable for limited switching frequency range by increased turn-on time, mostly in 30kHz~200kHz, Wu Faman
The application demand of sufficient higher switching frequency.
Based on digital form, the influence of input voltage and output power to variation turn-on time can be taken into account simultaneously, passes through essence
True quantitative calculating obtains required variation turn-on time, to realize preferably input current THD performances.Based on digital form
Variation turn-on time control can pass through calculate and table look-up in real time two ways realization.Real-time calculation passes through real-time sampling
The input voltage of CRM Boost pfc converters and output power instantaneous value are calculated by the operation processing unit of digitial controller
Obtain the turn-on time needed for the corresponding moment.Real-time calculation can theoretically realize variation turn-on time in converter work item
Arbitrary input voltage and the automatic adjusument under arbitrary output power within the scope of part.But the real-time calculating of digitial controller is related to
The isometric time-consuming complex calculation of evolution, division, multiplication；Frequency is periodically calculated simultaneously and detection frequency (switchs to determine
Pipe opens the moment, and the drain-source voltage of switch tube is needed to carry out zero passage detection or the lowest point detection) with the switching frequency of converter
It is synchronous, therefore calculation has very high requirement to the data-handling capacity of digitial controller with arithmetic speed in real time.With CRM
The raising of Boost pfc converter switching frequencies, there are the following problems for real-time calculation：
1. the cost and power consumption of digitial controller will dramatically increase；
2. there are the upper limits for existing digitial controller arithmetic speed, therefore can not take into account the calculating speed of turn-on time simultaneously
With control accuracy；
3. existing digitial controller is limited to the detectability of high-frequency periodic signal.
Therefore it is difficult to meet the development need of CRM Boost pfc converter high frequency based on the digital form calculated in real time
It asks.
Lookup table mode is according to the component parameters and particular job condition of CRM Boost pfc converter main circuits (including spy
Fixed input voltage and specific output power) leading for several moment in the lower two times of power frequency periods of corresponding operating condition is calculated
The logical time (several moment of selection answer reasonable layout in two times of power frequency periods)；Curve is carried out to the turn-on time at several moment
Fitting, obtains change curve of the turn-on time in two times of power frequency periods, that is, changes turn-on time curve；Turn-on time will be changed
The numerical information of curve is stored in the data storage cell of digitial controller in advance, and the variation constituted under corresponding operating condition is led
Logical time data table；Turn-on time tables of data is changed by digitial controller real-time query when CRM Boost pfc converters work,
The turn-on time at corresponding moment is read, and then the turn-on time of main switch is controlled.Certain stored in data storage cell
One variation turn-on time tables of data is only applicable to corresponding particular job condition.When CRM Boost pfc converters are operated in not
Under the conditions of input voltage and different output power, need to calculate and store several different variation turn-on time data in advance
Table need to carry out a large amount of mathematical computations in advance and consume a large amount of data space；Simultaneously need sampled input voltage with
Output power, and then determine the required variation turn-on time tables of data read.But there are following defects for lookup table mode：
1. considering the finiteness of the variation turn-on time tables of data of actual storage, variation turn-on time is in operating condition range
Adaptive adjustment capability under the conditions of interior arbitrary input voltage and arbitrary output power is limited, the control essence of the THD of input current
Degree will be restricted by system cost；
2. needing the output current of oversampled converter for calculating output power, system cost and implementation complexity are increased.
Therefore it is difficult to meet high frequency CRM Boost pfc converters in wide input voltage and width based on the digital form tabled look-up
The application demand of load scenarios.
Under the application scenario of wide input voltage and wide load, how to realize that high frequency CRM Boost pfc converters are adaptive
Optimize input current THD performances and reduce with answering and effectively system cost, has become pfc converter of new generation in high frequency, Gao Gong
The developing a major challenge in rate density direction.
Invention content
The purpose of the present invention is improve tradition CRM Boost pfc converters exposed in high frequency process it is apparent
Input current Zero-crossing Distortion and severe input current THD performances.It is above-mentioned existing applied to high frequency CRM Boost to overcome
Many deficiencies of the variation turn-on time control mode of pfc converter, proposition is a kind of to combine control mode based on simulation, number
High frequency CRM Boost pfc converters are detected without output power, you can realize high frequency CRM Boost pfc converters in work
Make adaptively to optimize input current THD under the conditions of different input voltages and different output power in condition and range, while significantly
Reduce system cost and implementation complexity.
The present invention provides it is a kind of can adaptive optimization input current THD high frequency CRM Boost pfc converters.
The present invention is implemented by following scheme：
A kind of variation turn-on time song high frequency CRM Boost pfc converters being changed needed for turn-on time control
The quantitative calculation method of line (for digital lookup table mode), can using the calculated variation turn-on time curve of computational methods institute
The THD of high frequency CRM Boost pfc converter input currents is significantly reduced, realizes the optimization of input current THD.It is used
The quantitative calculation method for changing turn-on time curve, is the average current based on boost inductance in CRM Boost pfc converters
The principle equal with input current, and the Sofe Switch resonant process of circuit in switch periods is considered to boost inductance charge charge and discharge
The influence of electricity.
The operating condition range of CRM Boost pfc converters is generally：90V~265V virtual values exchange input, 47Hz
~63Hz line frequencies, zero load~fully loaded variable load work (can continuously export zero to the arbitrary power between rated value, output power
Rated value is determined according to actual application demand).(input voltage is effective in a certain operating condition for CRM Boost pfc converters
Value is Vin_rms, output power Po, line frequency fline, converter working efficiency be η, wherein can be assumed that the work of converter
Make efficiency, such as：η=100%), the variation turn-on time curve that required achievable converter input current THD is optimized
It accurately calculates and is implemented by following steps：
1) the ideal waveform I of corresponding operating condition downconverter input current is calculatedin_expected(t)：
2) fixed certain moment t is taken in two times of power frequency periods under corresponding operating conditionsAs the calculating moment of turn-on time,
To tsThe charge charge and discharge process of boost inductance near moment carries out model analysis, and carried out model analysis should include following two
A resonant process：
A) the positive resonant process after the shutdown of switching tubes between boost inductance and power device parasitic capacitance；
B) the reversed resonant process before switching tubes are opened between boost inductance and power device parasitic capacitance.
In above-mentioned two resonant process, power device parasitic capacitance includes the output junction capacity C of switching tubeossAnd diode
Equivalent parallel capacitance Cdp。
Based on the charge charge and discharge model analysis to boost inductance, it is T to take certain fixed turn-on time initial valueon’；To boost inductance
Electric current is in tsSwitch periods T near momentsIt is inside integrated, obtains tsSwitch periods T near momentsInterior boost inductance
The total electrical charge that charges Qtotal, further calculate to obtain in tsSwitch periods T near momentsThe table of interior boost inductor current average value
Up to Formulas ILavg(tS,Ton’)：
As selected turn-on time initial value Ton' I cannot be madeLavg(tS,Ton') when having real solution, it should appropriate increase is led
Logical time initial value, until ILavg(tS,Ton') there is real solution.
3) it calculates and corrects by successive ignition, obtain tsThe turn-on time final value T at momenton(ts), make tsNear moment
Switch periods TsInterior boost inductor current average value ILavg(tS,Ton) and tsMoment ideal input current value Iin_expected(ts)
It is equal, i.e.,：
ILavg(ts,Ton(ts))=Iin_expected(ts) (3)
4) step 2) -3 is repeated), several other moment t in the lower two times of power frequency periods of corresponding operating condition can be calculatedx
Turn-on time Ton(tx).Quantity and the position at moment are calculated by being reasonably selected in two times of power frequency periods, and are calculated
The turn-on time at corresponding moment, according to chronological order to the turn-on time at above-mentioned calculating moment in two times of power frequency periods into
Row curve matching, when obtaining change curve of the turn-on time in two times of power frequency periods under corresponding operating condition, i.e. variation conducting
Half interval contour Ton(t).To ensure variation turn-on time curve Ton(t) precision can suitably increase near input voltage zero passage
Calculate the quantity at moment.
A kind of high frequency CRM BoostPFC converters, it is made of BoostPFC inverter main circuits and control circuit,
It is characterized in that：For control circuit using simulation and number combinatorics on words control mode, analog control circuit includes output voltage sampling
Circuit, input voltage zero cross detection circuit, boost inductor current zero cross detection circuit, is opened input voltage virtual value sample circuit
Close pipe cut-off signals generation circuit and switching tube drive signal generation circuit；Digital control circuit is that modulation wave signal generates electricity
Road.
1) the Boost pfc converters main circuit is by electromagnetic interface filter, rectifier bridge, input capacitance, boost inductance, switch
Pipe and its driving circuit, diode, output capacitance sequentially cascade composition.Wherein, the driving circuit of switching tube, which uses, is suitable for MHz
Downside ultrafast MOSFET (mos field effect transistor) integrated drive chips under the conditions of high-frequency work.
2) the output busbar and Power Groud of the output voltage sampling circuit input terminal connection Boost pfc converters, from
And the output busbar voltage of Boost pfc converters is sampled, and transformation of scale 1/K will be passed throughoSampled value (1/KoIt is output electricity
Press the downsampling factor of sample circuit, KoBusbar voltage and internal reference voltage V are exported for converterrefBetween ratio, internal base
Quasi- voltage Vref1~3V generally is taken, such as：Converter busbar voltage is 400V, and internal reference voltage is 2.5V, corresponding Ko=
It 400V/2.5V) is sent into the digitial controller of modulation wave signal generation circuit and carries out analog/digital conversion.The output voltage
Sample circuit is made of the resistance pressure-dividing network to Power Groud with same phase follower.According to the downsampling factor 1/K of output voltageo,
The resistance value of upper and lower divider resistance is rationally set.For the high-frequency noise for filtering out in output voltage sampled signal, the lower electricity of divider resistance
Hinder optionally low-capacitance capacitance in parallel (capacitance is generally not more than 1nF).
3) defeated on rear side of rectifier bridge in the input voltage virtual value sample circuit input terminal connection Boost pfc converters
The anode and negative terminal for entering capacitance to sample the input voltage of Boost pfc converters, and will pass through transformation of scale 1/KiAdopt
Sample value (1/KiIt is the downsampling factor of input voltage virtual value sample circuit, KiIt should be greater than inputting electricity within the scope of converter operating condition
Voltage crest value and digitial controller pin can bear the ratio between maximum input voltage, such as：Converter input voltage range
For 90VAC~265VAC, it is 3.3V that digitial controller pin, which can bear maximum input voltage, corresponding Ki>265V×1.414/
3.3V=114 considering that certain allowance can use Ki=125) it is sent into the digitial controller of modulation wave signal generation circuit and carries out mould
Quasi-/number conversion.The rectification that the input voltage virtual value sample circuit is made of operational amplifier and its peripheral resistance capacitance
Filter circuit and scaling circuit are constituted.Current rectifying and wave filtering circuit is sampled and is filtered to the input voltage on rear side of rectifier bridge
The average value of AC-input voltage；Realize that ratio enlargement obtains the effective of corresponding AC-input voltage by scaling circuit afterwards
Value.According to the proportionality coefficient of the DC current gain of current rectifying and wave filtering circuit and scaling circuit, (DC current gain and proportionality coefficient multiply
Product should be equal to 1/Ki), its peripheral resistance capacitance parameter is rationally set.The input voltage virtual value sample circuit also can be adopted directly
With dedicated real effective-direct current conversion chip, and its gain coefficient is set as 1/Ki。
4) in the input voltage zero cross detection circuit input terminal connection Boost pfc converters on rear side of electromagnetic interface filter
The firewire and zero curve of incoming line, to generate with AC-input voltage with frequently with the square-wave signal of phase, and by the square wave of generation
Signal is sent into the trigger signal capturing unit in the digitial controller of modulation wave signal generation circuit.The input voltage zero passage inspection
Slowdown monitoring circuit is by the resistance pressure-dividing network of Power Groud, operational amplifier, DC reference, comparator and peripheral resistance capacitance structure
At.The resistance pressure-dividing network sampling firewire of power grid, neutral voltage pressure difference simultaneously carry out transformation of scale；The sampling of two line voltage distribution pressure differences
Value respectively enters the reverse side and in-phase end of differential amplifier, while DC reference superposition enters the in-phase end of differential amplifier；
The output signal of differential amplifier is sent into comparator and DC reference thereafter and is compared to obtain with power grid input voltage with frequently same
The square-wave signal of phase.The input voltage zero cross detection circuit can also be used voltage hall detection component and directly detect firewire, zero
Two line voltage distribution of line, instead of among the above to the resistance pressure-dividing network of Power Groud.
5) the boost inductor current zero cross detection circuit input terminal connection and boost inductance phase in Boost pfc converters
The auxiliary winding of coupling, output signal are sent into switching tube drive signal generation circuit and switching tube cut-off signals generation circuit.
The boost inductor current zero cross detection circuit is made of auxiliary winding and hysteresis comparator.Auxiliary winding becomes with Boost PFC
Boost inductance in parallel operation is coupled, and the end position of the same name and the turn ratio of auxiliary winding and boost inductance is arranged, makes auxiliary winding
Output signal follows the drain-source voltage of switching tube to synchronize the requirement for changing and meeting rear class hysteresis comparator input voltage range；
The sampled signal of auxiliary winding is sent into hysteresis comparator by resistance-capacitance time delay process, exports and opens more afterwards with sluggish level
Close the trigger signal that pipe is opened；The rationally resistance capacitance ginseng of the upper and lower comparative level of setting hysteresis comparator and time delay process
Number is, it can be achieved that the Valley-Switching or no-voltage of switching tube are open-minded.
6) the modulation wave signal generation circuit is made of the digital/analog converter of digitial controller and periphery, number
Controller includes the hardware moulds such as analog/digital converter, operation processing unit, data storage cell and trigger signal capturing unit
Block.Digitial controller receives output voltage sampling circuit, input voltage virtual value sample circuit, input voltage zero cross detection circuit
Output signal, and generate be changed turn-on time control needed for control information, produced after digital/analog converter is converted
Raw modulation wave signal, and it is admitted to switching tube cut-off signals generation circuit.Analog/digital converter in the digitial controller
Independent external analog/digital converter can also be used, and it is connect with digitial controller the corresponding interface.
7) the switching tube cut-off signals generation circuit is made of sawtooth wave generating circuit and comparator.Sawtooth wave generates electricity
The sawtooth wave of generation is sent into comparator in-phase end by road, and modulation wave signal generation circuit compares the modulation wave signal feeding of output
Device reverse side；Two signals through comparator relatively after output switching tube shutdown trigger signal, and be admitted to switching tube drive signal
Generation circuit.
8) the switching tube drive signal generation circuit is made of rest-set flip-flop and timer signal trigger circuit.Switching tube
Open trigger signal and shutdown trigger signal respectively enter the S (Set) of rest-set flip-flop, the port R (Reset), rest-set flip-flop is defeated
Go out the drive signal of switching tube, and is admitted to the driving circuit of switching tube in Boost pfc converter main circuits；Timer signal
Trigger circuit is in parallel (output end and the port S (Set) for connecting rest-set flip-flop) with rest-set flip-flop, when it detects rest-set flip-flop
Not operating in fixed duration (setting according to actual needs) while restarting (such as converter booting work or failure), touches RS
It sends out device and carries out trigger action, for restarting after the starting up of CRM Boost pfc converters and fault recovery.
To the operation principle of the high frequency CRM Boost pfc converters, can be described as follows：
1) Boost pfc converters incoming transport power grid (voltage effective value ranging from 90VAC~260VAC, line frequency
Ranging from 47Hz~63Hz) after, peripheral control circuits start work first；When timer signal trigger circuit detects that RS is touched
The hair device attonity time is more than output startup trigger signal triggering after timing length (setting according to actual needs, can use 200 μ s)
Rest-set flip-flop acts, and to generate the drive signal of first switching tube, and through driving circuit driving switch pipe, makes CRM
Boost pfc converters carry out switch motion for the first time；Hereafter boost inductor current zero cross detection circuit works normally, and generates and continues
Property open trigger signal, CRM Boost pfc converters normal work.
2) auxiliary winding in boost inductor current zero cross detection circuit samples the terminal voltage of boost inductance and carries out the turn ratio
It converts, then the output signal of auxiliary winding follows the drain-source voltage of switching tube to synchronize variation.Auxiliary winding output signal is sent into
Hysteresis comparator is compared, and when it is less than the lower comparative level of hysteresis comparator, hysteresis comparator exports high level, is generated
The open signal of switching tube realizes that the no-voltage of switching tube is opened or Valley-Switching；When it is higher than the upper ratio of hysteresis comparator
Hysteresis comparator exports low level when compared with level, realizes that (rest-set flip-flop detection switch pipe opens the rising edge of trigger signal for reset
It is acted, therefore the output of hysteresis comparator need to carry out reset behaviour before switching tube next time opens trigger signal generation
Make).The saw-tooth wave generating circuit of switching tube opened in trigger signal while trigger switch pipe cut-off signals generation circuit, makes it
Process is started to charge up, then sawtooth wave amplitude starts to increase from zero；Hereafter sawtooth wave is risen under constant-current source effect with constant-slope
(the rate of rise du of sawtooth wavesawThe capacitance C of/dt and charging capacitorsawWith charging constant current size IchargeIt is related, and meet and close
System：dusaw/ dt=Icharge/Csaw), when sawtooth wave amplitude is higher than the modulation wave signal amplitude of comparator reverse side, comparator
High level is exported, the shutdown trigger signal of switching tube is generated.The trigger signal of opening of switching tube is sent respectively with shutdown trigger signal
Enter the ends Set of rest-set flip-flop in drive signal generation circuit and the ends Reset, generate respectively switching tube drive signal rising edge and
Failing edge, so that it is determined that the turn-on time of switching tube.In the case where saw-tooth wave generating circuit parameter determines, the conducting of switching tube
The amplitude of time and modulation wave signal is proportional.
3) to the input voltage under current operating conditions, (its virtual value is V to input voltage virtual value sample circuitin_rms) into
Row sampling filter will pass through transformation of scale 1/Ki(1/KiThe downsampling factor of virtual value sample circuit) sampled value Vin_rms/Ki
The analog/digital converter being sent into digitial controller, obtaining input voltage under current operating conditions through analog/digital conversion has
The digital quantity of valid value sampled value；Output voltage sampling circuit is to the output busbar voltage V under current operating conditionsoIt is sampled,
Transformation of scale 1/K will be passed througho(1/KoThe downsampling factor of output voltage) sampled value Vo/KoThe mould being sent into digitial controller
Quasi-/digital quantizer obtains the digital quantity that busbar voltage sampled value is exported under current operating conditions after analog/digital conversion；
Input voltage zero cross detection circuit generates the square-wave signal with frequency with phase with AC-input voltage, and is sent to digitial controller
Trigger signal capturing unit, digitial controller carries out timing to adjacent two edge moment of square-wave signal, and measuring and calculating obtains current
Line frequency f under operating conditionline, while according to AC-input voltage mistake under the current operating conditions of the determination of square-wave signal
Zero phase reference information carries out PLL locking phase controls to table lookup operation.
4) digitial controller is read from data storage cell in real time according to the line frequency calculated and phase reference information
The turn-on time data to prestore are taken, while according to the sampled value of the sampled value of input voltage virtual value and busbar output voltage, it is right
Read data carry out real-time transform, and the digital/analog converter outside result of calculation feeding is converted, and generate corresponding
Modulation wave signal, to realize the variation turn-on time control under current operating conditions.
A kind of modulation wave signal of achievable high frequency CRM Boost pfc converter adaptive optimization input currents THD
Production method is implemented by following steps：
1) a certain operating condition within the scope of arbitrarily selected CRM Boost pfc converter operating conditions is (except unloaded output
Outside, i.e., output power is not zero) it is basic operating conditions, each parameter of basic operating conditions includes：Input voltage virtual value
Vin_rms_base, output power Po_base, line frequency fline_baseWith the working efficiency η of converter, and CRM Boost PFC are determined
Component parameter in converter, including boost inductance inductance value, switching tube output junction capacity capacitance electricity in parallel with diode equivalent
Hold capacitance, the quantitative calculation method according to aforementioned variation turn-on time obtains CRM Boost pfc converters in groundwork item
To realize that input current THD optimizes required variation turn-on time curve under part, i.e., basic variation turn-on time curve
Ton_base(t), during obtaining basic variation turn-on time curve, to ensure that control accuracy should reasonably select two times of power frequencies
Calculating moment in period, i.e., the position near input voltage zero passage increase the quantity for calculating the moment, such as：fline_base=
50Hz (corresponding two times power frequency periods be 10ms) can select a calculating moment between 1ms~9ms every 1ms, 0ms~
Between 1ms a calculating moment is selected every 0.1ms between 9ms~10ms.
2) to changing turn-on time curve T substantiallyon_base(t) in two times of power frequency periods under basic operating conditions in the past
To sampling that is rear, carrying out constant duration successively, quantity of sampling quantity is S, and (S is generally even number, and S can be selected according to actual needs
Take, S is bigger, and control accuracy is higher, generally takes 100-200), to obtain basic variation turn-on time curve Ton_base(t)
Sampling sequence Ton_base_s(t), the length of corresponding sample sequence is S, by sampling sequence Ton_base_s(t) it is pre-stored in digital control
In the data storage cell of device, as lookup data；
3) under the conditions of arbitrary input voltage and output power within the scope of CRM Boost pfc converter operating conditions,
The output square wave of trigger signal capturing unit in digitial controller to input voltage zero cross detection circuit under current operating conditions
Signal (square-wave signal is with AC-input voltage with the same phase of frequency) is captured, and the adjacent two edge moment to square-wave signal is passed through
Timing is carried out, the line frequency f under current operating conditions can be calculatedline, and determine to changing turn-on time sequence substantially
Ton_base_s(t) the frequency f of inquiry reading is carried outlut(flut=fline× S), while being determined according to the edge moment of square-wave signal
The basic variation turn-on time sequence T of inquiryon_base_s(t) position of data in realizes the control of PLL locking phases, ensures the edge on square wave side
Moment corresponds to the basic variation turn-on time sequence T of inquiryon_base_s(t) the first data in.
4) digitial controller is with S × flineFrequency of tabling look-up the numerical value of turn-on time is successively read from table data store
Ton_base_s(ts), and ensure that (frequency is two times of line frequencies, i.e. 2f to periodicityline) process of tabling look-up and square-wave signal same-phase
(i.e. input voltage zero-acrross ing moment corresponds to first turn-on time data in inquiry storage sequence)；Digitial controller is to input electricity
It is pressed with valid value and is sampled and carried out analog/digital conversion with busbar output voltage, obtain corresponding sampled value Vin_rms/KiWith
Vo/Ko；The sampled value V of busbar output voltageo/KoWith the internal reference level V of digitial controllerrefIt compares, difference DELTA VEA
Error turn-on time T is generated after overvoltage PI ringson_error；The operation processing unit of digitial controller is according to following expression
(4) to the basic turn-on time numerical value T for reading of tabling look-upon_base_s(ts) real-time linear transformation is carried out, obtain current operating conditions
The turn-on time T at lower corresponding momenton(ts)：
The i.e. current work of change curve that each point turn-on time being calculated according to above formula is constituted in two times of power frequency periods
The variation turn-on time curve that input current THD is optimized can be achieved under the conditions of work；
5) operation processing unit in digitial controller is to the T that calculates in real timeon(ts) data carry out ratio change according to the following formula
It changes, obtains the real time data V of corresponding modulating waveform signalcomp(ts)：
Wherein, dusaw/ dt is the rate of rise of the sawtooth signal in aforementioned switches pipe cut-off signals generation circuit, will be right
Answer the real time data V of modulation wave signalcomp(ts) be sent into digitial controller outside digital-to-analog conversion chip converted, produce
Realize that input current THD optimizes the live signal of required modulating wave under raw current operating conditions, to converter switches
The turn-on time of pipe carries out real-time control, and from the point of view of two times of power frequency periods, switching tube turn-on time will change according to predetermined rule,
The optimization of input current THD can be achieved.
About using formula (4) can be achieved converter within the scope of operating condition arbitrary operating condition (input voltage with it is defeated
Go out power) under adaptive optimization input current THD foundation explanation：
(a) is under the conditions of identical input voltage, the difference between the corresponding variation turn-on time curve of different output power
It is approximately constant in two times of power frequency periods, i.e., exists in approximation between the corresponding variation turn-on time curve of different output power
The relationship of lower translation (see attached drawing 7-1~attached drawing 7-4).Error turn-on time T in formula (4)on_errorConstitute CRM Boost
The output voltage closed loop of pfc converter is, it can be achieved that changing turn-on time under the conditions of identical input voltage, different output power
Curve carries out the function of upper and lower translation, therefore using voltage close loop to the voltage stabilizing function of output busbar voltage, you can realizes variation
Turn-on time controls automatic adjusument under the conditions of identical input voltage, different output power, and eliminates and led in basic variation
It is influenced caused by the difference of selected transform device efficiency in logical time graph calculating process.
(b) is under the conditions of identical output power, is corresponded under different input voltages between the turn-on time at moment and there is approximation
Once linear transformation relation (see attached drawing 8), and linear transform coefficient is approximately equal to the inverse ratio value of two input voltage virtual values.Such as
Shown in formula (4), to changing the data T in turn-on time Curve Sequences substantiallyon_base_s(ts) carry out transformation of scale Vin_rms/
Vin_rms_baseAnd with error turn-on time Ton_errorIt is added, you can realize under identical output power, different input voltages to base
Data in this variation turn-on time Curve Sequences carry out expected once linear transformation, realize variation turn-on time control in phase
Automatic adjusument under the conditions of same output power, different input voltages.
The technical characteristics of the present invention compared with prior art are：
1. to overcome all of the existing variation turn-on time control mode applied to high frequency CRM Boost pfc converters
It is mostly insufficient, propose a kind of high frequency CRM Boost pfc converters combining control based on simulation, number：It is realized by analog circuit
The zero passage detection of boost inductor current, the generation of switching tube cut-off signals, the production of switching tube drive signal under the conditions of high-frequency work
Raw, input voltage virtual value sampling, the sampling for exporting busbar voltage, input voltage zero passage detection etc., by digitial controller
The modulation wave signal needed for variation turn-on time control is realized, to make the highest switching frequency of CRM Boost pfc converters
Up to several megahertzs or more, and significantly reduce the performance requirement to digitial controller；Change is generated using based on the digital form tabled look-up
Change the modulation wave signal needed for turn-on time control, while taking into account the influence of input voltage and output power to turn-on time, it is real
Now make the variation turn-on time control that input current THD is optimized, it is defeated to be effectively improved high frequency CRM Boost pfc converters
Enter the Zero-crossing Distortion and THD performances of electric current.The simulation, number combination control mode can meet CRM Boost pfc converters
The high frequency demand being increasingly urgent to, while significantly reducing performance requirement and cost to digitial controller.
2. carrying out linear transformation, it can be achieved that height by the data in the basic variation turn-on time Curve Sequences to being stored
Arbitrary input voltage of the frequency CRM Boost pfc converters within the scope of operating condition carries out certainly under the conditions of arbitrary output power
The variation turn-on time of adaptation controls, to realize the adaptive optimization of converter input current THD performances.
3. only needing the data in the basic variation turn-on time Curve Sequences under storage basic operating conditions, substantially reduce number
The data capacity stored needed for word controller, and additional detections need not be carried out to output power, to significantly reduce the reality of system
Ready-made and complexity.
The high frequency CRM Boost pfc converters that the present invention is suitable for working under the conditions of wide input voltage, wide variable load are (most
High switching frequency is up to several megahertzs or more), it is especially suitable then to have strict demand to input current THD performances and system cost
High frequency CRM Boost pfc converters.
Description of the drawings
Attached drawing 1-1, attached drawing 1-2 are the CRM considered between boost inductance and power device parasitic capacitance including resonance process
The work wave of Boost pfc converters.Wherein, attached drawing 1-1 is that CRM Boost pfc converters realize that switch tube zero voltage is opened
Work wave when logical, attached drawing 1-2 are work waves when CRM Boost pfc converters realize switching tube Valley-Switching.
Attached drawing 2-1~attached drawing 2-5 is equivalent modalities figure of the CRM Boost pfc converters in the different operating stage, mark
Arrow is the flow path of inductive current.Wherein, [t in attached drawing 2-1 respective figures 1-10,t1] and attached drawing 1-2 in [t0,t1] rank
Section；[t in Fig. 2-2 respective figures 1-11,t2] stage；[t in Fig. 2-3 respective figures 1-12,t3] and attached drawing 1-2 in [t1,t2] rank
Section；[t in Fig. 2-4 respective figures 1-13,t4] and attached drawing 1-2 in [t2,t3] stage；[t in Fig. 2-5 respective figures 1-14,t5] and
[t in attached drawing 1-23,t4] stage.
Attached drawing 3-1 and attached drawing 3-2 is become to realize based on the boost inductor current average value principle equal with input current
Parallel operation input current THD under certain operating condition optimizes the calculated variation turn-on time set of curves of institute.Wherein, attached drawing 3-1
It is in two AC-input voltage of 110V and 220V, different output power (75W, 150W, 225W, 300W) item respectively with attached drawing 3-2
Variation turn-on time set of curves under part.
Attached drawing 4 is that the wide input voltage that may be implemented in of the present invention loads adaptive optimization input current under change condition with wide
The structure diagram of the high frequency CRM Boost pfc converters of THD.
Attached drawing 5 is that the wide input voltage that may be implemented in of the present invention loads adaptive optimization input current under change condition with wide
The circuit diagram of the high frequency CRM Boost pfc converters of THD performances.
Attached drawing 6 is the logic execution block diagram inside the digitial controller of the present invention.
Attached drawing 7-1~attached drawing 7-4 is that changing under the conditions of identical AC-input voltage, different output power for the present invention is led
Exemplary relationship between logical time graph.Wherein, attached drawing 7-1 and attached drawing 7-3 provides 90V and 260V AC-input voltage items respectively
Under part, the variation turn-on time set of curves of output power 75W, 150W, 225W, 300W；Attached drawing 7-2 and attached drawing 7-4 give respectively
Under the conditions of going out 90V and 260V AC-input voltages, the variation turn-on time curve of output power 150W, 225W, 300W with it is defeated
Go out the difference curve cluster between the variation turn-on time curve that power is 75W.
Attached drawing 8 is that (110V, 130V, 150V, 170V, 190V, 220V, 240V, 260V exchange are defeated for different AC-input voltages
Entering voltage, line frequency 50Hz) turn-on time in lower two times of power frequency periods in the sections 5ms~10ms exchanges input with 90V
The scatter plot between the turn-on time at moment and matched curve are corresponded under voltage.
Attached drawing 9-1~attached drawing 9-4 is that constant on-time control is respectively adopted in CRM Boost pfc converter experimental prototypes
With contrast experiment's oscillogram of the variation turn-on time control of the present invention.Wherein, attached drawing 9-1, attached drawing 9-3 are CRM respectively
Boost pfc converters are under the conditions of two AC-input voltage of 110V and 200V using existing constant on-time control mode
Experimental waveform figure；Attached drawing 9-2, attached drawing 9-4 are CRM Boost pfc converters respectively in two AC-input voltage of 110V and 200V
Under the conditions of it is using the present invention variation turn-on time control mode experimental waveform figure.
Attached drawing 10 is the CRM Boost that constant on-time control and the variation turn-on time control of the present invention is respectively adopted
Pfc converter experimental prototype input current THD under the conditions of 110V and two AC-input voltages of 200V changes with output power
Measurement result.
Primary symbols title in above-mentioned attached drawing：vgsThe grid source drive signal of-switching tube；iL、IL- boost inductance electricity
Stream；vdsThe drain-source voltage of-switching tube；TSWThe switch periods of-switching tube；TONThe turn-on time of-switching tube；Q1~Q5—
The charging charge of boost inductance in the corresponding stage；VoThe output busbar voltage of-converter；Vin、vinInput capacitance after-rectifier bridge
On terminal voltage；L-boost inductance；Q-switching tube；DqbThe parasitic body diode of-switching tube；CossThe output knot of-switching tube
Capacitance；D-diode；CdqThe equivalent parallel capacitance of-diode；Cbus- output bus capacitor；vin(t)-t moment rectifier bridge
Voltage in input capacitance afterwards；Load、RoutThe output loading of-converter；IinThe input current of-converter；Cin- rectification
Input capacitance after bridge；1/KiThe downsampling factor of-input voltage virtual value；1/KoThe downsampling factor of-output voltage；Vin_rms—
Input voltage virtual value；Vin_rms/KiThe sampled value of-input voltage virtual value；Vo/KoThe sampled value of-output voltage；VREFIt is
Internal voltage reference；ΔVEA- voltage error signal；Vcomp- modulation wave signal；Ton_error- error turn-on time；Ton_base_s
(ts)—tsThe turn-on time that moment reads from basic change turn-on time sequence；fline- line frequency；S-data storage is single
The number of turn-on time data is stored in member；VREF_DC- DC voltage benchmark；dusaw/ dt-sawtooth wave the rate of rise；ADC1、
ADC2-analog-digital converter；DAC-digital analog converter；CAP-trigger signal capturing unit.
Specific implementation mode
Embodiment one：The variation turn-on time curve that CRM Boost pfc converter input currents THD is optimized can be achieved
The generation method of (being used for lookup table mode)
It (is used to obtain the variation turn-on time curve that CRM Boost pfc converter input currents THD can be achieved and optimize
In lookup table mode), need the operation mode to CRM Boost pfc converters to analyze.Fig. 1-1, Fig. 1-2 are to consider to boost
Resonance between inductance and power device parasitic capacitance (the equivalent parallel capacitance for including the output junction capacity of switching tube and diode)
The work wave of CRM Boost pfc converters including process, includes the drive signal v of switching tubegs, boost inductor current iL
With the drain-source voltage v of switching tubeds.Wherein, Fig. 1-1 is that switching tube realizes that no-voltage opens (input voltage v at this timeinLess than one
Half output voltage Vo) when converter work wave, Fig. 1-2 is that switching tube realizes Valley-Switching (input voltage v at this timeinIt is high
In the output voltage V of halfo) when converter work wave.Consider that the switching frequency of converter is significantly larger than line frequency, therefore
Think the input voltage v of converterinIt is remained unchanged in switch periods, while considering converter in the input voltage positive and negative period
The consistency of interior working condition hereafter only provides converter (i.e. v within input voltage positive periodinMore than operation mode zero) point
Analysis.
Corresponding diagram 1-1, when switching tube realizes that no-voltage is opened, the operation mode of converter is described as follows：
[t0,t1] stage：Boost inductor current iLIn t0Moment is decreased to zero, and boost inductance L exports junction capacity with switching tube
CossWith diode equivalent shunt capacitance CdpBetween reversed resonance, boost inductor current i occursLTo CossAnd CdpElectric discharge, and it is reversed
Flow into the input capacitance C on rear side of rectifier bridgein, the drain-source voltage v of switching tubedsFrom t0Moment starts resonance decline, initial value
For output voltage Vo；
[t1,t2] stage：The drain-source voltage v of switching tubedsIn t1Moment resonance is decreased to zero, opens switching tube reality at this time
The no-voltage of existing switching tube is open-minded, t1Moment inductive current iLIt is negative, hereafter in input voltage vinIt acts on lower linear to increase, increase
Slope is vin/ L, in t2Moment is linearly increasing to zero；
[t2,t3] stage：Boost inductor current iLIn input voltage vinThe lower continuation of effect is linearly increasing, increases slope and is
vin/L；
[t3,t4] stage：From t1Moment passes through turn-on time TonAfterwards, switching tube is in t3Moment turn off, boost inductance L with open
Close pipe output junction capacity CossWith diode equivalent shunt capacitance CdpBetween positive resonance, boost inductor current i occursLTo CossWith
CdpCharging, the drain-source voltage v of switching tubedsFrom t3Moment starts resonance increase, initial value zero；
[t4,t5] stage：Switching tube drain-source voltage vdsIn t4Moment resonance rises to output voltage Vo, diode current flow,
Boost inductor current iLIn input voltage vinWith output voltage VoCollective effect lower linear reduce, reduce slope be-(Vo-
vin)/L, and in t5Moment is linearly decreased to zero, and hereafter converter enters next work period.
When switching tube realizes that no-voltage is opened, the charging of stage duration and boost inductance under each operation mode of converter
Charge expression formula is shown in Table 1：
1 switching tube of table realizes the stage duration of each operation mode of converter and boost inductance charging electricity when no-voltage is opened
Lotus expression formula
Corresponding diagram 1-2, when switching tube realizes Valley-Switching, the operation mode of converter is described as follows：
[t0,t1] stage：Boost inductor current iLIn t0Moment is decreased to zero, and boost inductance L exports junction capacity with switching tube
CossWith diode equivalent shunt capacitance CdpBetween reversed resonance, boost inductor current i occursLTo CossAnd CdpIt discharges and reversed
Flow into the input capacitance C on rear side of rectifier bridgein, switching tube drain-source voltage vdsFrom t0Moment starts resonance decline, and initial value is
Output voltage Vo；
[t1,t2] stage：The drain-source voltage v of switching tubedsIn t1Moment resonance is decreased to the lowest point (in resonant process most
Small magnitude), the Valley-Switching that switching tube realizes switching tube, t are opened at this time1Moment boost inductor current iLIt is zero, is hereafter inputting
Voltage vinIt acts on lower linear to increase, increase slope is vin/L；
[t2,t3] stage：From t1Moment passes through turn-on time TonAfterwards, switching tube is in t2Moment turn off, boost inductance L with open
Close pipe output junction capacity CossWith diode equivalent shunt capacitance CdpBetween positive resonance, boost inductor current i occursLTo CossWith
CdpCharging, the drain-source voltage v of switching tubedsFrom t2Moment starts resonance increase, initial value zero；
[t3,t4] stage：The drain-source voltage v of switching tubedsIn t3Moment rises to output voltage Vo, diode current flow, liter
Piezoelectricity inducing current iLIn input voltage vinWith output voltage VoCollective effect lower linear reduce, reduce slope be-(Vo-vin)/
L, and in t4Moment is linearly decreased to zero, and hereafter converter enters next work period.
When switching tube realizes Valley-Switching, the charging charge of the stage duration and boost inductance of each operation mode of converter
Expression formula is shown in Table 2：
The stage duration and boost inductance charging charge of each operation mode of converter when 2 switching tube of table realizes Valley-Switching
Expression formula
Fig. 2-1~Fig. 2-5 provides equivalent circuit diagram of the CRM Boost pfc converters under above-mentioned each operation mode.Its
In, [the t of Fig. 2-1 corresponding diagrams 1-10,t1] stage and Fig. 1-2 [t0,t1] stage；[the t of Fig. 2-2 corresponding diagrams 1-11,t2] stage；
[the t of Fig. 2-3 corresponding diagrams 1-12,t3] stage and Fig. 1-2 [t1,t2] stage；[the t of Fig. 2-4 corresponding diagrams 1-13,t4] stage and figure
[the t of 1-22,t3] stage；[the t of Fig. 2-5 corresponding diagrams 1-14,t5] stage and Fig. 1-2 [t3,t4] stage.
Based on above-mentioned model analysis, under a certain operating condition of the CRM Boost pfc converters within the scope of operating condition
(input voltage virtual value is Vin_rms, output power Po, line frequency fline, converter working efficiency be η) needed for
Accurate variation turn-on time curve can be obtained by following steps：
1) the ideal waveform I of current operating conditions downconverter input current is calculatedin_expected(t)：
2) certain moment t in fixed two times of power frequency periods is takensAs the calculating moment of turn-on time, and at the beginning of prefetching certain turn-on time
Value is Ton’；In tsSwitch periods T near momentsIt is interior that boost inductor current is integrated, obtain tsSwitch near moment
Cycle TsInterior boost inductance charging total electrical charge Qtotal, to further calculate to obtain in tsSwitch periods T near momentsInterior liter
The expression formula I of voltage inductance current averageLavg(tS,Ton’)：
As selected turn-on time initial value Ton' I cannot be madeLavg(tS,Ton') when having real solution, it should appropriate increase is led
Logical time initial value, until ILavg(tS,Ton') there is real solution.
3) the numerical analysis softwares such as Matlab or Mathcad are utilized, is calculated and is corrected by successive ignition, obtain ts
Turn-on time final value T near momenton(ts), make tsSwitch periods T near momentsInterior boost inductor current average value ILavg
(tS,Ton) and tsMoment ideal input current value Iin_expected(ts) equal, i.e.,：
ILavg(ts,Ton(ts))=Iin_expected(ts) (3)
4) step 2) -3 is repeated), several other moment t in the lower two times of power frequency periods of current operating conditions can be calculatedx
Turn-on time Ton(tx).Quantity and the position at moment are calculated by being reasonably selected in two times of power frequency periods, and are calculated
The turn-on time at corresponding moment, carries out the turn-on time at calculated moment according to chronological order in two times of power frequency periods
Curve matching obtains change curve of the turn-on time in two times of power frequency periods under current operating conditions, that is, changes turn-on time
Curve Ton(t).To improve variation turn-on time curve Ton(t) when precision should reasonably select the calculating in two times of power frequency periods
It carves, i.e., suitably increases the quantity for calculating the moment near input voltage zero passage, such as：It is corresponding when line frequency is 50Hz
Two times of power frequency periods are 10ms, and a calculating moment can be selected every 1ms between 1ms~9ms, and between 0ms~1ms with
A calculating moment can be selected between 9ms~10ms every 0.1ms.
The accurate variation turn-on time curve T obtained based on the above methodon(t) CRM Boost PFC can theoretically be realized
The optimization of converter input current THD performances.Accurately change turn-on time curve T according to above-mentioned acquisitionon(t) method, figure
3-1 and Fig. 3-2 is given at the change being calculated under the conditions of 110V and 220V AC-input voltages (line frequency 50Hz) respectively
Change turn-on time curve Ton(t) cluster, the different output power of four curves difference correspondent transform devices in cluster：75W、150W、225W
With 300W.Wherein, in calculating process converter used operating condition parameters：AC-input voltage VACin=110V/220V,
Output power Po=75W/150W/225W/300W, output voltage Vo=400V, boost inductance inductance value L=80 μ H, power device are posted
Raw capacitor's capacity Coss+Cdq(power device parasitic capacitance includes the output junction capacity C of switching tube to=70pFossWith switching tube etc.
Imitate shunt capacitance Cdq, the two is parallel relationship), line frequency fline=50Hz, working efficiency η=100% of converter.Such as figure
Shown in 3-1 and Fig. 3-2, the accurate variation turn-on time curve T of acquisitionon(t) inverted " saddle " shape is presented in power frequency period
Shape, turn-on time obviously increase near input voltage zero passage.
Embodiment two：A kind of high frequency CRM Boost pfc converters, and can realize its adaptive optimization input current THD
Modulation wave signal production method
Attached drawing 4 show can adaptive optimization input current THD high frequency CRM Boost pfc converters structural frames
Figure, it is made of Boost pfc converters main circuit with control circuit, it is characterised in that：Control circuit is using simulation, digital group
Control mode is closed, analog control circuit part includes output voltage sampling circuit, input voltage virtual value sample circuit, input
Voltage zero-crossing detection circuit, boost inductor current zero cross detection circuit, switching tube cut-off signals generation circuit and switching tube drive
Signal generating circuit；Digital control circuit part is modulation wave signal generation circuit.
The highest switching frequency of the high frequency CRM Boost pfc converters is because of boosting up to several megahertzs or more
Inductive current zero cross detection circuit, switching tube cut-off signals generation circuit and switching tube drive signal generation circuit are using simulation electricity
Road is realized, digitial controller can be overcome to the limited deficiency of MHz high-frequency signal response speeds, while being reduced to digitial controller
Performance requirement；The high frequency CRM Boost pfc converters can adaptively optimize input current THD, be because modulating wave is believed
Number generation circuit, can be in different input voltages and different output works using tabling look-up with the digital form realization being combined is calculated in real time
Optimal variation turn-on time control is adaptively realized under the conditions of rate.
Attached drawing 5 be can adaptive optimization input current THD high frequency CRM Boost pfc converters one embodiment,
It is characterized in that：Output voltage sampling circuit is made of the resistance pressure-dividing network to Power Groud, downsampling factor 1/Ko, KoFor
Converter exports the ratio between busbar voltage and internal reference voltage, and the busbar voltage of Boost pfc converters is in this example
The internal reference voltage of 400V, controller are 2.5V, corresponding Ko=400V/2.5V=160；Input voltage virtual value sample circuit
Using dedicated virtual value-direct current conversion chip, downsampling factor 1/Ki, KiIt should be higher than that defeated within the scope of converter operating condition
Enter voltage peak and digitial controller pin can bear ratio between maximum input voltage, the input electricity of converter in this example
Ranging from 90VAC~265VAC is pressed, it is 3.3V that digitial controller pin, which can bear maximum input voltage, takes Ki=125 (125>
265V × 1.414/3.3V=114)；Input voltage zero cross detection circuit is by resistance pressure-dividing network and operational amplifier, direct current
Benchmark, comparator and peripheral resistance capacitance is pressed to constitute；The boost inductor current zero cross detection circuit is by auxiliary winding and late
Stagnant comparator is constituted；The modulation wave signal generation circuit is made of digitial controller and digital/analog converter, wherein number
Include that analog/digital converter, operation processing unit, data-storage unit and trigger signal capturing unit etc. are hard inside controller
Part module；The switching tube cut-off signals generation circuit is made of sawtooth wave generating circuit and comparator；The switching tube driving
Signal generating circuit is made of rest-set flip-flop and timer signal trigger circuit.
Now the groundwork process of converter shown in attached drawing 5 is described as follows：
1) (its voltage effective value can be arbitrary in 90VAC~260VAC to Boost pfc converters incoming transport power grid
Value, line frequency can be the arbitrary value in 47Hz~63Hz) after, peripheral control circuits start work first：Timer signal
Trigger circuit (output end and the Set input ports of connection rest-set flip-flop) starts timing and detects rest-set flip-flop whether there is or not outputs to believe
Number, when detect rest-set flip-flop non-output signal duration be more than timing length (timing length can be set as needed, this example
In set it to 200 μ s), the one pulse signal triggering rest-set flip-flop action of timers trigger circuit output is opened to generate
Open-minded for the first time, the CRM Boost PFC of switching tube are realized in first open signal for closing pipe, the driving circuit driving through switching tube
Converter, which normally starts, simultaneously enters periodic duty, and hereafter switching tube opens trigger signal by boost inductance zero cross detection circuit
It realizes.
2) auxiliary winding of boost inductance carries out the turn ratio transformation (auxiliary winding and boost inductance to the terminal voltage of boost inductance
The position relationship of Same Name of Ends see attached drawing 5), output voltage follows switching tube drain-source voltage to synchronize variation.Work as boost inductance
The drain-source voltage resonance that electric current is decreased to switching tube after zero declines, then the output voltage of auxiliary winding declines therewith, when its is low
When the lower comparative level of hysteresis comparator, hysteresis comparator exports the triggering open signal that high level generates switching tube, can be real
The no-voltage of existing switching tube is opened or Valley-Switching；During diode current flow, auxiliary winding exports the positive pressure of a certain amplitude,
And its amplitude, higher than the upper comparative level (being realized by adjusting the number of turns of auxiliary winding) of hysteresis comparator, hysteresis comparator is defeated
Go out low level, realizes the reset of rest-set flip-flop.
3) switching tube opens trigger signal while triggering saw-tooth wave generating circuit, it is made to start to charge up process, sawtooth wave
Amplitude is started from scratch linearly increasing (its rate of rise dusaw/ dt is remained unchanged), when sawtooth wave amplitude is produced higher than modulation wave signal
When the modulation wave signal amplitude of raw circuit output, comparator exports high level thereafter, and the shutdown to generate switching tube triggers letter
Number.
4) rest-set flip-flop determines switching tube driving letter in the case where switching tube opens trigger signal and turns off the triggering of trigger signal
Number rising edge time and failing edge moment, to control the turn-on time of switching tube.The normal work of CRM Boost pfc converters
When making, the turn-on time of switching tube is directly proportional to the amplitude of modulation wave signal, therefore switch tube is changed turn-on time control
The key of system is to construct required modulation wave signal.
Now to the modulating wave of achievable high frequency CRM Boost pfc converter adaptive optimization input currents THD in this example
The implementation process of signal is done described below：
1) basic operating conditions of CRM BoostPFC converters are selected, such as：Input voltage virtual value is Vin_rms_base
=90V, line frequency fline_base=50Hz, output power Po_base=75W, converter working efficiency be η=
100%；Measurement obtains the boost inductance inductance value L=80 μ H of converter, by actually selecting the databook of power device to read work(
Rate device parasitic capacitor's capacity Coss+Cdq(switching tube selects the IPP60R385CP of company of Infineon, diode to select to=70pF
The C3D02060A of Cree companies).It is optimized according to CRM Boost pfc converter input currents THD can be achieved in embodiment one
Variation turn-on time curve generation method, take timing punctum 0.1ms, 0.2ms, 0.3ms, 0.4ms, 0.5ms, 0.6ms,
0.7ms、0.8ms、0.9ms、1ms、2ms、3ms、4ms、5ms、6ms、7ms、8ms、9ms、9.1ms、9.2ms、9.3ms、
Total 27 points of 9.4ms, 9.5ms, 9.6ms, 9.7ms, 9.8ms, 9.9ms are to calculate the moment, and calculate the conducting at corresponding moment
Time carries out curve fitting in 10ms to 27 turn-on time data points, to obtain changing turn-on time curve substantially
Ton_base(t)。
2) to changing turn-on time curve T substantiallyon_base(t) in 10ms from front to back, carry out constant duration successively
The sampling of (time interval 0.1ms), quantity of sampling quantity S=100, to obtain basic variation turn-on time curve Ton_base
(t) sampling sequence Ton_base_s(t), the data bulk in sampling sequence is S=100, by sampling sequence Ton_base_s(t) with
1 × 100 array form is stored in the data storage cell of digitial controller, the data to be checked as table lookup operation.
3) firewire, the neutral voltage of input voltage zero cross detection circuit oversampled converter input side, generation and work at present
Under condition (not necessarily basic operating conditions) AC-input voltage with frequency with the square-wave signal of phase, the triggering in digitial controller
Signal capture unit captures the square-wave signal：Timing is carried out by the adjacent two edge moment to the square-wave signal, from
And the line frequency f under current operating conditions is calculatedline, and calculate to changing turn-on time sequence T substantiallyon_base_s(t)
The frequency for being inquired, being read data is flut=fline× S=100fline；It is determined and is inquired according to the edge moment of square-wave signal
Basic variation turn-on time sequence Ton_base_s(t) position of data in is realized and is controlled the locking phase of table lookup operation, ensures square wave
The basic variation turn-on time sequence T of rising edge inquiry corresponding with the failing edge momenton_base_s(t) the first data in.
4) to the input voltage under converter current operating conditions, (its virtual value is input voltage virtual value sample circuit
Vin_rms) sampling filter is carried out, and transformation of scale 1/K will be passed throughiSampled value be sent into digitial controller in analog/digital turn
Parallel operation obtains input voltage virtual value sampled value V under converter current operating conditions through analog/digital conversionin_rms/KiNumber
Word amount；Output voltage sampling circuit is to the output busbar voltage V under current operating conditionsoIt is sampled, and ratio will be passed through and become
Change 1/KoSampled value be sent into the analog/digital converter in digitial controller, after analog/digital conversion obtaining converter works as
Busbar voltage sampled value V is exported under preceding operating conditiono/KoDigital quantity.
5) under the conditions of arbitrary input voltage and output power within the scope of CRM Boost pfc converter operating conditions,
Digitial controller is in two times of power frequency periods with flut=100flineFrequency of tabling look-up base is successively read from data storage cell
The numerical value T of this turn-on time Curve Sequenceson_base_s(ts) (real-time table lookup operation needs to ensure input voltage zero-acrross ing moment pair
First turn-on time data in storage sequence should be inquired)；The sampled value V of busbar output voltageo/KoWith digitial controller
Internal reference level VrefIt compares, difference DELTA VEAError turn-on time T is generated after overvoltage PI ringson_error；Number control
The operation processing unit of device processed is according to following expression (4) to the basic turn-on time numerical value T for reading of tabling look-upon_base_s(ts) into
The real-time linear transformation of row, obtains the real-time conduction time T that the moment is corresponded under current operating conditionson(ts)：
Under current operating conditions, according to each point turn-on time T of above formula calculatingon(tx) constituted in two times of power frequency periods
Change curve the variation turn-on time curve that input current THD is optimized can be realized；
6) operation processing unit in digitial controller is to the T that calculates in real timeon(ts) data carry out ratio change according to the following formula
It changes, obtains the real time data V of corresponding modulating waveform signalcomp(ts)：
Wherein, dusaw/ dt is the rate of rise of the sawtooth signal in aforementioned switches pipe cut-off signals generation circuit, will be right
Answer the real time data V of modulation wave signalcomp(ts) be sent into digitial controller outside digital-to-analog conversion chip converted, from
And generate and realize that input current THD optimizes the live signal of required modulating wave under current operating conditions, to converter switches
The turn-on time of pipe carries out real-time control.Modulation wave signal V in two times of power frequency periodscomp(t) switching tube turn-on time is made to exist
Change according to predetermined rule in two times of power frequency periods, to realize the optimization of input current THD under current operating conditions.
Fig. 6 provides the logic execution block diagram of the digitial controller in the present invention.
Analysis verification：Appoint within the scope of operating condition about using the achievable CRM Boost pfc converters of expression formula (4)
The analysis verification of adaptive optimization input current THD under operating condition of anticipating
(a) is led based on the variation that CRM Boost pfc converter input currents THD optimizations can be achieved in embodiment one
The generation method of logical time graph, research are found：Under the conditions of identical input voltage, the corresponding variation conducting of different output power
Difference between time graph is approximately constant in two times of power frequency periods, i.e., under the conditions of identical input voltage, different output work
There is the relationship of approximate upper and lower translation between the corresponding variation turn-on time curve of rate, Fig. 7-1~Fig. 7-4 is given at line frequency
Under the conditions of 50Hz, the relationship under the conditions of identical input voltage, different output power between corresponding variation turn-on time curve
Example.Wherein, Fig. 7-1 and Fig. 7-3 be respectively 90 and 260V, two AC-input voltages under different output power (75W, 150W,
225W, 300W) corresponding variation turn-on time set of curves；Fig. 7-2 provides 90V with Fig. 7-4 and exchanges input electricity with 260V two respectively
When the variation that pressure output power respectively changes when turn-on time curve with output power is 75W when being 150W, 225W, 300W is connected
Difference curve cluster between half interval contour.By Fig. 7-2 and Fig. 7-4 as it can be seen that when one timing of power grid input voltage, different output power
Variation turn-on time curve when corresponding variation turn-on time curve and output power are 75W under (150W, 225W, 300W) it
Between difference be approximately a constant in two times of power frequency periods.It is used in the calculating process of above-mentioned variation turn-on time curve
Parameter is：Line frequency fline=50Hz, converter working efficiency η=100%；Boost inductance inductance value L=80 μ H, power device
Parasitic capacitance capacitance Coss+Cdq=70pF.
In expression formula (4), error turn-on time Ton_errorTurn-on time T is included in the form of addendon(ts) calculating, structure
At voltage close loop to carry out voltage stabilizing control to busbar output voltage.When one timing of input voltage, voltage close loop and error are utilized
Turn-on time Ton_errorUpper and lower translation of variation turn-on time curve under the conditions of different output power can be achieved.It therefore need not inspection
Survey the output power of converter, you can realize variation turn-on time control under the conditions of identical input voltage, different output power
Adaptive optimizing regulation；Simultaneously can eliminate substantially variation turn-on time curve calculating process in selected transform device efficiency not
With caused influence.
(b) is led based on the variation that CRM Boost pfc converter input currents THD optimizations can be achieved in embodiment one
The generation method of logical time graph, research are found：Under the conditions of identical output power, leading for moment is corresponded under different input voltages
There are approximate once linear transformation relations between the logical time, and linear transform coefficient is approximately equal to the anti-of input voltage virtual value
Ratio.Fig. 8 provide different virtual value input voltages (be respectively 110V, 130V, 150V, 170V, 190V, 220V, 240V, 260V,
Line frequency is 50Hz) under, the turn-on time T in two times of sections power frequency period 5ms~10mson(ts) inputted substantially with 90V
Voltage (Vin_rms_base=90V) under correspond to the turn-on time T at momenton_base(ts) between relationship scatter plot.Fig. 8 horizontal axis is
Turn-on time T in the sections the basic input voltages of 90V lower two times of power frequency period 5ms~10mson_90V(ts), the longitudinal axis be other not
With the turn-on time T under input voltageon_xxxV(ts).In figure the corresponding calculating moment point of data be followed successively by 5ms, 6ms, 7ms,
8ms, 9ms, 9.1ms, 9.2ms, 9.3ms, 9.4ms, 9.5ms, 9.6ms, 9.7ms, 9.8ms, 9.9ms amount to 14 points.It calculates
Parameter used during above-mentioned each moment turn-on time is：Output power is Po=75W, line frequency fline=50Hz, change
Parallel operation working efficiency is η=100%, boost inductance inductance value L=80 μ H, the parasitic capacitance C of power deviceoss+Cdq=70pF.It is right
Different virtual value input voltages in Fig. 8 correspond to the relationship scatterplot march of moment turn-on time under the basic input voltages of 90V
Line is fitted, and is obtained corresponding linear relationship expression formula, be see the table below 3：
The different virtual value input voltages (110V, 130V, 150V, 170V, 190V, 220V, 240V, 260V) of table 3 and 90V
The curve matching expression formula of the relationship scatterplot of moment turn-on time is corresponded under basic input voltage
| Vin_rms | Linear relationship expression formula | Proportionality coefficient | Constant term | Vin_rms/Vin_rms_base | Scale factor errors1 |
| 110V | Ton_110V(ts)=0.8185Ton_90V(ts)-249.87 | 0.8185 | -249.87 | 0.8182 | - 0.037% |
| 130V | Ton_130V(ts)=0.6930Ton_90V(ts)-367.88 | 0.6930 | -367.88 | 0.6923 | - 0.101% |
| 150V | Ton_150V(ts)=0.6015Ton_90V(ts)-429.58 | 0.6015 | -429.58 | 0.6000 | - 0.249% |
| 170V | Ton_170V(ts)=0.5309Ton_90V(ts)-456.07 | 0.5309 | -456.07 | 0.5294 | - 0.283% |
| 190V | Ton_190V(ts)=0.4751Ton_90V(ts)-462.89 | 0.4751 | -462.89 | 0.4737 | - 0.295% |
| 220V | Ton_220V(ts)=0.4104Ton_90V(ts)-461.49 | 0.4104 | -461.49 | 0.4091 | - 0.317% |
| 240V | Ton_240V(ts)=0.3767Ton_90V(ts)-460.20 | 0.3767 | -460.20 | 0.3750 | - 0.453% |
| 260V | Ton_260V(ts)=0.3478Ton_90V(ts)-452.57 | 0.3478 | -452.57 | 0.3462 | - 0.460% |
Note 1：" scale factor errors " are proportionality coefficient and current operating conditions (input voltage in linear relationship expression formula
Virtual value is Vin_rms) under " Vin_rms/Vin_rms_base" between percentage error.
As it can be seen that between the turn-on time at certain virtual value AC-input voltage moment corresponding with 90V basic communication input voltages
There are approximate once linear transformation relations, and the proportionality coefficient in linear transformation relational expression is approximately equal to two input voltages
The inverse ratio value V of virtual valuein_rms/Vin_rms_base(error coefficient is within 0.5%).Therefore, when converter output power is certain
When, by changing the data T in turn-on time curve substantiallyon_base(ts) carry out once linear transformation appropriate, you can it obtains
Variation turn-on time curve T under arbitrary virtual value input voltageon(ts)。
In expression formula (4), the basic data T changed in turn-on time Curve Sequenceson_base_s(ts) it is multiplied by proportionality coefficient
Vin_rms/Vin_rms_base, result of product is included in turn-on time T in the form of addendon(ts) calculating；Error turn-on time simultaneously
Ton_errorThe constant term in above-mentioned once linear transformation can be realized under voltage close loop effect.Therefore using in expression formula (4)
Once linear transformation, it can be achieved that variation turn-on time is adaptively excellent under the conditions of identical output power, different input voltage
Change and adjusts.
CRM Boost pfc converters can be achieved in operating condition using expression formula (4) in the above analysis (a), (b)
Adaptively optimize input current THD under arbitrary operating condition in range.
The verification experimental verification of the present embodiment (embodiment two)：
Fig. 9-1, Fig. 9-2 are respectively the variation turn-on time control carried with the present invention using constant on-time control
Contrast experiment waveform of the CRM Boost pfc converters under 110V AC-input voltages；Fig. 9-3, Fig. 9-4, which are provided, to be respectively adopted
The CRM Boost pfc converters that constant on-time controls the variation turn-on time control proposed with the present invention are exchanged in 200V
Contrast experiment's waveform under input voltage.It tests with the circuit parameter of CRM Boost pfc converters and is：Boost inductance inductance value L
=80 μ H, switching tube select IPP60R385CP, diode to select C3D02060A, the parasitic capacitance capacitance C of power deviceoss+Cdq
=70pF；The experimental condition of CRM Boost pfc converters is：50Hz line frequencies, 110V or 200V AC-input voltages,
400V output voltages, 75W output powers.By Fig. 9-1, Fig. 9-2, using the change of the invention carried under 110V AC-input voltages
After changing turn-on time control, the THD of converter input current is considerably decreased to 1.3% from 13.7%；By Fig. 9-3, Fig. 9-4,
After the variation turn-on time control carried using the present invention under 200V AC-input voltages, the THD of converter input current from
15.3% is considerably decreased to 3.0%.
Figure 10 gives above-mentioned experiment CRM Boost pfc converters model machines in 110V and two AC-input voltage items of 200V
Using constant on-time control input current THD corresponding with the variation turn-on time control of the present invention with output power under part
Change curve, test result shows：Based on the variation turn-on time control that the present invention is carried, CRM Boost pfc converters
It can get the input current THD of optimization, in other words, height of the invention under the conditions of different input voltages, different output power
Frequency CRM Boost pfc converters can adaptive optimization input current THD and effect of optimization it is good.
Claims (3)
1. a kind of high frequency CRM Boost pfc converters, it is made of Boost pfc converters main circuit and control circuit,
It is characterized in that：For control circuit using simulation and number combinatorics on words control mode, analog control circuit includes output voltage sampling
Circuit, input voltage zero cross detection circuit, boost inductor current zero cross detection circuit, is opened input voltage virtual value sample circuit
Close pipe cut-off signals generation circuit and switching tube drive signal generation circuit；Digital control circuit is that modulation wave signal generates electricity
Road；The driving circuit of switching tube uses low under the conditions of being suitable for MHz high-frequency works in the Boost pfc converters main circuit
The ultrafast MOSFET in side drives integrated chip；The output voltage sampling circuit by Power Groud resistance pressure-dividing network and with mutually with
It is constituted with device；The rectifying and wave-filtering that the input voltage virtual value sample circuit is made of operational amplifier and its peripheral resistance capacitance
Circuit is constituted with scaling circuit or the input voltage virtual value sample circuit directly uses dedicated virtual value-direct current
Conversion chip；The input voltage zero cross detection circuit is by resistance pressure-dividing network or voltage hall detection component and operation amplifier
Device, DC voltage benchmark, comparator and peripheral resistance capacitance are constituted；The boost inductor current zero cross detection circuit is by assisting
Winding and hysteresis comparator are constituted；The modulation wave signal generation circuit is converted by digitial controller and the digital-to-analog of periphery
Device is constituted, and digitial controller includes analog/digital converter, operation processing unit, data storage cell and trigger signal capture
Unit hardware module, the wherein analog/digital converter in digitial controller use independent external simulation/digital quantizer,
And it is connect with digitial controller the corresponding interface；The switching tube cut-off signals generation circuit is by sawtooth wave generating circuit and ratio
It is constituted compared with device；The switching tube drive signal generation circuit is made of rest-set flip-flop and timer signal trigger circuit.
2. high frequency CRM Boost pfc converters as described in claim 1, it is characterised in that：The Boost pfc converters
Main circuit is by electromagnetic interface filter, rectifier bridge, input capacitance, boost inductance, switching tube and its driving circuit, diode, output capacitance
Sequentially cascade is constituted；The output busbar and Power Groud of the output voltage sampling circuit input terminal connection Boost pfc converters,
Its output end connects modulation wave signal generation circuit；The input voltage virtual value sample circuit input terminal connection Boost PFC
The anode and negative terminal of input capacitance on rear side of converter rectifier bridge, output end connect modulation wave signal generation circuit；It is described defeated
Enter the firewire of the incoming line in voltage zero-crossing detection circuit input terminal connection Boost pfc converters on rear side of electromagnetic interface filter with
Zero curve, output end connect modulation wave signal generation circuit；Boost inductor current zero cross detection circuit input terminal connection with
The auxiliary winding that boost inductance is coupled in Boost pfc converters, output end connecting valve pipe drive signal generation circuit
With switching tube cut-off signals generation circuit；The modulation wave signal generation circuit output end connecting valve pipe cut-off signals generate electricity
Road；The switching tube cut-off signals generation circuit output end connecting valve pipe drive signal generation circuit；The switching tube driving
Signal generating circuit output end connects the driving circuit of switching tube in Boost pfc converter main circuits.
3. realizing high frequency CRM Boost pfc converter adaptive optimization input currents using claim 1-2 any transformation devices
The production method of the modulation wave signal of THD, is implemented by following steps：
1) it is basic operating conditions to select a certain operating condition within the scope of CRM Boost pfc converter operating conditions, each to join
Number includes input voltage virtual value Vin_rms_base, output power Po_base, line frequency fline_baseWith converter working efficiency η,
Several moment in the lower two times of power frequency periods of reasonable selection basic operating conditions, which are used as, calculates the moment, according to component in converter
Parameter, including boost inductance inductance value, switching tube output junction capacity capacitance and diode equivalent shunt capacitance capacitance accurately calculates
Converter is the turn-on time for realizing input current THD Performance optimizations needed for the above-mentioned selected moment, each to what is be calculated
Moment turn-on time carries out curve fitting in two times of power frequency periods, obtains changing turn-on time curve T substantiallyon_base(t)；
2) to changing turn-on time curve T substantiallyon_base(t) sampling of constant duration, quantity of sampling quantity are carried out successively from front to back
It it is S, to obtain basic variation turn-on time curve Ton_base(t) sampling sequence Ton_base_s(t), corresponding sample sequence
Length be S, by sampling sequence Ton_base_s(t) it is stored in the data storage cell of digitial controller, as number of tabling look-up
According to；
3) under the conditions of arbitrary input voltage and output power within the scope of CRM Boost pfc converter operating conditions, number
The output square-wave signal of trigger signal capturing unit in controller to the input voltage zero cross detection circuit under work at present item
It is captured, timing is carried out by the adjacent two edge moment to square-wave signal, the circuit under current operating conditions is calculated
Frequency fline, and determine to sampling sequence Ton_base_s(t) frequency for carrying out inquiry reading is flut=fline× S, while according to side
The edge moment of wave signal determines inquiry sampling sequence Ton_base_s(t) PLL locking phases are realized in the position of data in, ensure square wave letter
Number the edge moment correspond to inquiry storage sequence in first data；
4) digitial controller is sampled and is carried out analog/digital conversion to input voltage virtual value and busbar output voltage, is obtained
To corresponding sampled value Vin_rms/KiWith Vo/Ko, 1/KiIt is the downsampling factor of input voltage virtual value sample circuit, KiIt should be greater than becoming
Input voltage peak value and digitial controller pin can bear the ratio between maximum input voltage within the scope of parallel operation operating condition；
1/KoIt is the downsampling factor of output voltage sampling circuit, KoBusbar voltage and internal reference voltage V are exported for converterrefBetween
Ratio, internal reference voltage VrefTake 1~3V；By Vo/KoWith reference voltage VrefIt compares, difference DELTA VEAThrough overvoltage PI rings
Error turn-on time T is generated afterwardson_error；The operation processing unit of digitial controller is read according to following expression (1) to tabling look-up
Sampling sequence data Ton_base_s(ts) real-time linear transformation is carried out, obtain the conducting that the moment is corresponded under current operating conditions
Time Ton(ts)：
5) operation processing unit in digitial controller is to the turn-on time T that calculates in real timeon(ts) data are compared according to the following formula
Example transformation, obtains the real time data V of corresponding modulating waveform signalcomp(ts)：
Wherein, dusaw/ dt is the rate of rise of the sawtooth signal in aforementioned switches pipe cut-off signals generation circuit, is adjusted corresponding
The real time data V of wave signal processedcomp(ts) be sent into digitial controller outside digital-to-analog conversion chip converted, generation can
It realizes that input current THD optimizes the live signal of required modulating wave, the turn-on time of converter switches pipe is carried out real-time
Control.
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| CN106487215B (en) * | 2016-11-11 | 2019-04-09 | 南京航空航天大学 | The optimal control of CRM boost PFC converter variation turn-on time |
| CN108075635B (en) * | 2016-11-18 | 2020-03-31 | 沃尔缇夫能源系统公司 | Control method of PFC circuit |
| CN107863880B (en) * | 2017-11-28 | 2019-05-14 | 华中科技大学 | A kind of full digital control method and device of totem PFC |
| CN108513403B (en) * | 2018-04-17 | 2020-11-10 | 南京矽力微电子技术有限公司 | Control circuit and control method of power converter |
| CN108667283A (en) * | 2018-06-11 | 2018-10-16 | 矽力杰半导体技术(杭州)有限公司 | A kind of control method and system for reducing THD |
| CN108696158A (en) * | 2018-06-22 | 2018-10-23 | 南京航空航天大学 | The compensating control method of CRM Boost pfc converter input filter capacitor electric currents |
| CN109152142A (en) * | 2018-09-25 | 2019-01-04 | 杰华特微电子（杭州）有限公司 | Switching Power Supply and LED drive circuit |
| EP3854179B1 (en) * | 2018-10-26 | 2023-12-13 | Tridonic GmbH & Co KG | Method and apparatus of adjusting parameter for electrical device |
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| CN117134586B (en) * | 2023-10-26 | 2024-02-09 | 茂睿芯（深圳）科技有限公司 | Multi-mode working power factor correction control system |
| CN117762500B (en) * | 2024-02-22 | 2024-04-26 | 国网江苏省电力有限公司扬州供电分公司 | High-precision data optimization method for line parameters and operation system thereof |
| CN118137819B (en) * | 2024-05-07 | 2024-08-27 | 西安麦格米特电气有限公司 | PFC control method, device and system in discontinuous conduction mode |
| CN118157499B (en) * | 2024-05-09 | 2024-08-16 | 武汉理工大学 | Low-harmonic high-efficiency optimization method based on bus port voltage self-adaptive adjustment |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7295452B1 (en) * | 2006-09-07 | 2007-11-13 | Green Mark Technology Inc. | Active power factor correction circuit and control method thereof |
| CN201312258Y (en) * | 2008-10-23 | 2009-09-16 | 上海儒竞电子科技有限公司 | Single-phase power factor correction hysteresis current controller |
| CN101764528A (en) * | 2010-01-08 | 2010-06-30 | 南京航空航天大学 | High power factor DCM Boost PFC converter |
| CN202167984U (en) * | 2011-08-09 | 2012-03-14 | 深圳茂硕电源科技股份有限公司 | PFC (Power Factor Correction) circuit for high input voltage |
| CN102684470A (en) * | 2012-04-01 | 2012-09-19 | 中南大学 | Method for controlling stable operation of integer power factor of variable-frequency air conditioner |
| CN104242692A (en) * | 2014-07-28 | 2014-12-24 | 南京理工大学 | CRM Boost PFC converter with optimal frequency changing range |
| CN104883046A (en) * | 2015-06-12 | 2015-09-02 | 南京理工大学 | High-power factor critical continuous mode buck-boost power factor correction converter |
-
2016
- 2016-07-04 CN CN201610522189.XA patent/CN106100373B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7295452B1 (en) * | 2006-09-07 | 2007-11-13 | Green Mark Technology Inc. | Active power factor correction circuit and control method thereof |
| CN201312258Y (en) * | 2008-10-23 | 2009-09-16 | 上海儒竞电子科技有限公司 | Single-phase power factor correction hysteresis current controller |
| CN101764528A (en) * | 2010-01-08 | 2010-06-30 | 南京航空航天大学 | High power factor DCM Boost PFC converter |
| CN202167984U (en) * | 2011-08-09 | 2012-03-14 | 深圳茂硕电源科技股份有限公司 | PFC (Power Factor Correction) circuit for high input voltage |
| CN102684470A (en) * | 2012-04-01 | 2012-09-19 | 中南大学 | Method for controlling stable operation of integer power factor of variable-frequency air conditioner |
| CN104242692A (en) * | 2014-07-28 | 2014-12-24 | 南京理工大学 | CRM Boost PFC converter with optimal frequency changing range |
| CN104883046A (en) * | 2015-06-12 | 2015-09-02 | 南京理工大学 | High-power factor critical continuous mode buck-boost power factor correction converter |
Non-Patent Citations (1)
| Title |
|---|
| A Digitally Controlled Critical Mode Boost Power Factor Corrector With Optimized Additional On Time and Reduced Circulating Losses;Jong-Woo Kim et.al.;《IEEE TRANSACTIONS ON POWER ELECTRONICS》;20150630;第30卷(第6期);第3447-3455页 * |
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