CN107465341A - A kind of control method and control circuit of DCMBoost power factor correcting converters - Google Patents
A kind of control method and control circuit of DCMBoost power factor correcting converters Download PDFInfo
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- CN107465341A CN107465341A CN201710803670.0A CN201710803670A CN107465341A CN 107465341 A CN107465341 A CN 107465341A CN 201710803670 A CN201710803670 A CN 201710803670A CN 107465341 A CN107465341 A CN 107465341A
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- power factor
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- factor correcting
- boost power
- input voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4225—Arrangements for improving power factor of AC input using a non-isolated boost converter
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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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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- Power Engineering (AREA)
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- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of control method and control circuit of DCM Boost power factor correcting converters.Control method comprises the following steps：Detect the output voltage V of DCM Boost power factor correcting converterso, with reference voltage VrefError is carried out to amplify to obtain error amplification signal VEA；Passing ratio coefficient kiObtain control signal Vcon_i, by control signal Vcon_iRespectively compared with sawtooth waveforms, control pulse P is producedi；When each switch periods start, the input voltage v after DCM Boost power factor correcting converter rectifications is detectedrecAnd with input voltage border ViAfter being compared, P is selectediAs effective control pulse, for controlling the switching tube of DCM Boost power factor correcting converters to turn on.Control circuit includes input voltage determining device, control pulse generator and control pulse selector.The present invention can improve the power factor of traditional DCM Boost power factor correcting converters, and the power factor close to 1 can be obtained in 90V~264V AC input voltage range.
Description
Technical field
The present invention relates to DCM Boost power factor correcting converters, particularly a kind of DCM Boost PFCs
The control method and control circuit of converter.
Background technology
Power factor correcting converter can reduce harmonic pollution of the power electronic equipment to public electric wire net, have power because
Number is high, small volume, low cost and other advantages.Work in the Boost power factor correcting converters of discontinuous mode (DCM)
The advantages that to control simple, diode-less reverse recovery loss and be used widely.Determine Duty ratio control DCM Boost power
The switching tube conducting dutycycle of factor correction converter is fixed, and input current abnormality be present, and with the raising of input voltage, it is defeated
Enter that current distortion is more serious, cause the reduction of input power factor, at some to power factor and Harmonics of Input requirement
Very high occasion, determine Duty ratio control DCM Boost power factor correcting converters and be difficult to meet to require.
The content of the invention
It is an object of the invention to provide a kind of DCM Boost power factor correctors control methods of High Power Factor and control
Circuit processed.
Realize that the control method technical scheme of the object of the invention is as follows：
A kind of control method of DCM Boost power factor correcting converters, comprises the following steps：
Detect the output voltage V of DCM Boost power factor correcting converterso, with reference voltage VrefCarry out error amplification
Obtain error amplification signal VEA；
Passing ratio coefficient kiObtain control signal Vcon_i, i.e. Vcon_i=kiVEA；The proportionality coefficientWherein Vm_maxFor the peak value of maximum input voltage, MiFor input voltage border coefficient, i=0,1,
2,…,n；
By control signal Vcon_iRespectively compared with sawtooth waveforms, control pulse P is producedi；
When each switch periods start, the input after the DCM Boost power factor correcting converter rectifications is detected
Voltage vrecAnd with input voltage border ViIt is compared：Work as Vi≤vrec＜ Vi+1When, select PiAs effective control pulse；When
vrec≥VnWhen, select PnAs effective control pulse；The input voltage border Vi=MiVm_max, the effectively control pulse use
In the switching tube conducting of control DCM Boost power factor correcting converters.
Further technical scheme, the voltage border coefficient
Realize that the control circuit technical scheme of the object of the invention is as follows：
A kind of control circuit of DCM Boost power factor correcting converters, including input voltage determining device, control pulse
Generator and control pulse selector；
The input voltage determining device includes first comparator B10, B11..., B1nWith d type flip flop D1, D2..., Dn；First
Comparator B10Positive input terminal be used for connecting valve period detecting signal VPC, negative input end is for connecting sawtooth waveforms vsaw, output
End is connected to d type flip flop D1, D2..., DnCLK ends；First comparator B11..., B1nPositive input terminal be respectively used to connect it is defeated
Enter voltage border Vi, i=1,2 ..., n, negative input end be respectively used to connect DCM Boost power factor correcting converter rectifications
Input voltage v afterwardsrec, output end is connected respectively d type flip flop D1, D2..., DnD ends；
The control pulse generator includes error amplifier, potential-divider network K0, K1..., KnWith the second comparator B20,
B21..., B2n；The negative input end of error amplifier is used for the output electricity for connecting the DCM Boost power factor correcting converters
Press Vo, positive input terminal is for connecting reference voltage Vref, output end is connected to potential-divider network K0, K1..., KnInput；Partial pressure
Network K0, K1..., KnOutput end be connected respectively to the second comparator B20, B21..., B2nPositive input terminal；Second compares
Device B20, B21..., B2nNegative input end be used for connect sawtooth waveforms vsaw；The potential-divider network K0, K1..., KnProportionality coefficient point
Wei not k0, k1... kn；
The control pulse selector includes and door Y0, Y1..., YnAnd OR gate；With door Y1Input be connected respectively to D
Trigger D1QN ends, d type flip flop D2Q ends and the second comparator B21Output end；With door Y2Input be connected respectively to D
Trigger D2QN ends, d type flip flop D3Q ends and the second comparator B22Output end；With door Y3..., Yn-1With d type flip flop and
The annexation of two comparators is by that analogy；With door Y0Input be connected respectively to d type flip flop D1Q ends and the second comparator
B20Output end；With door YnInput be connected respectively to d type flip flop DnQN ends and the second comparator B2nOutput end；With door
Y0, Y1..., YnOutput end be connected respectively to the input of OR gate, the output end of OR gate be used to connecting DCM Boost power because
The switching tube of number correcting converter.
The beneficial effects of the invention are as follows：So that in the range of whole 90~264V ac input voltages, DCM Boost power
Factor corrector can obtain be similar to 1 power factor.
Brief description of the drawings
Fig. 1 is the DCM Boost power factor correcting converter system architecture diagrams of the present invention；
Fig. 2 is the control method flow chart of the DCM Boost power factor correcting converters of the present invention；
Fig. 3 is the circuit diagram of input voltage determining device (100), including comparator (101,102,103,104,105), D are touched
Send out device (106,107,108,109)；D type flip flop DiQ ends output be VQi, the output of QN ends is VNQi；
Fig. 4 be control pulse generator (200) circuit diagram, including error amplifier (201), potential-divider network (202), ratio
Compared with device (203)；
Fig. 5 be control pulse selector (300) circuit diagram, including with door (301,302,303), OR gate (304), driving
Circuit (305)；
Fig. 6 be the present invention key waveforms, including (a) input voltage border, (b) control pulse pattern, (c) inductive current
Waveform and (d) switching tube drive waveforms；
Fig. 7 is the design method of input voltage border coefficient；
Fig. 8 is the input voltage and input current waveform in the case of different input voltages, including (a) input voltage waveform and
(b) input current waveform；
Fig. 9 is that the PF for determining Duty ratio control and the DCM Boost power factor correcting converters of the present invention is contrasted；
Figure 10 is that the THD for determining Duty ratio control and the DCM Boost power factor correcting converters of the present invention is contrasted；
Figure 11 is VinDuring=110V, the input voltage, defeated of Duty ratio control DCM Boost power factor correcting converters is determined
Enter electric current, inductive current simulation waveform；
Figure 12 is VinDuring=264V, the input voltage, defeated of Duty ratio control DCM Boost power factor correcting converters is determined
Enter electric current, inductive current simulation waveform；
Figure 13 is VinDuring=110V, input voltage, the input electricity of DCM Boost power factor correcting converters of the invention
Stream, inductive current simulation waveform；
Figure 14 is VinDuring=264V, input voltage, the input electricity of DCM Boost power factor correcting converters of the invention
Stream, inductive current simulation waveform；
Above-mentioned accompanying drawing primary symbols title：vinFor input ac voltage, havevrecAfter rectification
Input voltage, haveω is input ac voltage angular frequency.VinFor input voltage virtual value.iin
For input current.iLFor inductive current.L is Boost boost inductance.Q is switching tube.VD is diode.C is Boost
Converter output capacitance.R is load.VoFor output voltage.PiTo control pulse pattern.DiTo control pulse PiCorresponding accounts for
Empty ratio.TsFor the converter switches cycle.TlineFor power frequency period.ViFor input voltage border.vgsFor switching tube drive signal.
Embodiment
Further detailed description is done to the present invention below by specific example with reference.
Fig. 1 is the system architecture diagram of the DCM Boost power factor correcting converters of the present invention, is controlled as shown in Figure 1
Circuit is made up of three parts：Input voltage determining device 100, control pulse generator 200, control pulse selector 300.
Pulse generator 200 is controlled by an error amplifier 201, n+1 control impulse ratio ki(i=0,1,2 ...,
N) formed with n+1 comparator, control pulse generator 200 detects output voltage Vo, and exported by error amplifier 201
Voltage error feedback signal VEA, the output end of error amplifier and n+1 proportionality coefficient ki(i=0,1,2 ..., n) is connected, and is obtained
To n+1 control signal Vcon_i(i=0,1,2 ..., n), by with sawtooth waveforms vsawIt is compared, obtains n+1 control arteries and veins
Rush Pi(i=0,1,2 ..., n), the output end of wherein n+1 comparator respectively with n+1 in control pulse selector 300 with
Door connection.Input voltage determining device 100 is made up of n+1 comparator and n d type flip flop, and control pulse selector 300 is by one
OR gate 304 and n+1 forms with door.When each switch periods starts, V in input voltage determining device 100PCWith sawtooth waveforms vsaw
It is compared by comparator 101, the CLK ends of whole d type flip flops in input voltage detector 100 is put 1, work as V0≤vrec＜ V1
When, comparator 102 exports high level, the D ends of d type flip flop 106 is put into 1, then VQ0For high level, and by controlling pulse selector
In 300 with 301 pairs of door control pulse P0Carry out being selected as Boost and effectively control pulse；Work as Vi≤vrec＜ Vi+1
When, comparator 103 exports low level, the D ends of trigger 107 is set to 0, then VNQiFor high level, comparator 104 exports high level,
The D ends of trigger 108 are put 1, then VQiAlso be high level, and by control in pulse selector 300 with 303 pairs of door control arteries and veins
Rush PiBe selected as effective control pulse of Boost；WhenWhen, comparator 105 exports low level, by D
The D ends of trigger 109 are set to 0, then VQnFor high level, and by with 304 couples of control pulse P of doornCarry out being selected as Boost conversion
Effective control pulse of device.
The dutycycle of DCM Boost power factor correcting converters is by input voltage determining device 100, control pulse generator
200 determine with control pulse selector 300.The step of control method is：1st, output voltage V is detectedo, with reference voltage Vref
Error is carried out to amplify to obtain error amplification signal VEA；2nd, n+1 proportionality coefficient k is passed throughi(i=0,1,2 ..., n) obtain n+1
Control signal Vcon_i(i=0,1,2 ..., n), wherein, Vcon_i=kiVEA, setVm_maxIt is defeated for maximum
Enter the peak value of voltage, such as：To 90V~264V ac input voltage excursions,Mi(i=0,1,
2 ..., n) it is voltage border coefficient, set3rd, by n+1 control signal Vcon_i(i=0,1,2 ...,
N) respectively compared with sawtooth waveforms, n+1 control pulse P is producedi(i=0,1,2 ..., n)；4th, opened in each switch periods
During the beginning, the input voltage v after rectification is detectedrecAnd with n+1 input voltage border Vi(i=0,1,2 ..., n) is compared, if
Put input voltage border Vi=MiVm_max；5th, V is worked as0≤vrec＜ V1When, select P0As effective control Pulse Width Control switching tube
Conducting；Work as Vi≤vrec＜ Vi+1When, select PiAs effective control pulse；Work as vrec≥VnWhen, select PnAs effective control arteries and veins
Punching.
Fig. 2 is the control method flow chart of the DCM Boost power factor correcting converters of the present invention, defeated as shown in Figure 2
Enter voltage determining device 100, control pulse generator 200 with controlling the effect of pulse selector 300 to be：
1) input voltage determining device 100：When each switch periods starts, input voltage determining device 100 is by after rectification
Input voltage vrec(t) with default n+1 input voltage border Vi(i=0,1,2 ..., n) is compared, to determine vrec
(t) voltage range residing for, wherein
Vi=MiVm_max (3)
In formula, Vm_maxFor input ac voltage highest when voltage magnitude, for example, 90~264V ac input voltage scopes,Mi(i=0,1 ..., n) it is input voltage border coefficient.MiAny one input voltage border can be used
The definition mode of coefficient.To realize optimal technique effect, unit sine sin (ω t) is divided into (n+ in the range of 0~pi/2
1) section, as shown in fig. 7, MiFor unit SIN function corresponding to each phase Along ent.
2) pulse generator 200 is controlled：Pulse generator 200 is controlled to detect DCM Boost power factor correcting converters
Output voltage Vo, with reference voltage VrefError is carried out to amplify to obtain error amplification signal VEA；It is individual by (n+1) of setting again
Different control impulse ratio coefficient ksi(i=0,1,2 ..., n), obtain (n+1) individual different control signal Vcon_i(i=0,1,
2 ..., n), wherein Vcon_i=kiVEA, then by control signal and sawtooth waveforms vsawIt is compared, obtains (n+1) individual different control
Pulse Pi(i=0,1,2 ..., n), control pulse PiCorresponding dutycycle DiFor
Di=kiDo (5)
Wherein, impulse ratio coefficient k is controllediIt is arranged to
3) pulse selector 300 is controlled：According to the output signal of input voltage determining device, control pulse selector selection phase
The control pulse answered, realizes the control of switching tube, and its selection course is as shown in Figure 6.Fig. 6 is the main oscillogram of the present invention, its
In (a) be input voltage waveform, wherein (b) be control pulse selection course, (c) is inductive current waveform, and (d) is switching tube
Drive waveforms.From Fig. 6 (a) and Fig. 6 (b), work as V0≤vrec＜ V1When, select P0As effective control pulse, work as Vi≤vrec
＜ Vi+1When, select PiAs effective control pulse, work as vrec≥VnWhen, select PnAs effective control pulse, therefore can obtain half
In power frequency period, the change in duty cycle function D of DCM Boost power factor correcting converters of the inventionPT(t)。
The input current i of the DCM Boost power factor correcting converters of the present inventionin：
WithOn the basis of be worth, standardization is carried out to formula (8), the input current i of standardization can be obtainedin *：
Wherein iin_i *For
N=13 is taken, can determine that the DCM Boost PFCs of the present invention become with formula (6) according to formula (3), formula (4)
Whole control circuit parameters of parallel operation.When table 1 and table 2 are n=13, input voltage border ViWith controlling impulse ratio coefficient ki's
Value.
The input voltage border V of table 1i(volt)
Table 2 controls impulse ratio ki
According to above-mentioned parameter, can make as shown in figure 8, output voltage VoWhen=400, in half of power frequency period, no
With input voltage virtual value VinCorresponding input voltage and input current waveform.Work as V it can be seen from Fig. 8 (a)in=110V
When, vrec(t) V can only be risen to3, therefore only used 4 kinds of control pulses；Work as VinDuring=264V, vrec(t) V will be risen to13,
Therefore 14 kinds of control pulses will be used.The V it can be seen from Fig. 8 (b)in=110V and VinDuring=264V, corresponding input current
Waveform is all closely and sinusoidal form.
Fig. 9 determines position the PF of Duty ratio control and the DCM Boost power factor correcting converters of the present invention.As shown in Figure 9,
In the range of 90~264V ac input voltages, the PF minimums of Duty ratio control DCM Boost power factor correcting converters are determined
For 0.865, and the PF minimums of the DCM Boost power factor correcting converters of the present invention are 0.996.
Figure 10 determines position the THD of Duty ratio control and the DCM Boost power factor correcting converters of the present invention.By Figure 10 institutes
Show, in the range of 90~264V ac input voltages, determine the maximum of Duty ratio control DCM Boost power factor correcting converters
THD is 58%, and the maximum THD of the DCM Boost power factor correcting converters of the present invention is only 8%.
Figure 11 and Figure 12 is respectively VinDuring=110V and VinDuring=264V, Duty ratio control DCM Boost power factors are determined
The input ac voltage v of correcting converterin, input current iin, inductive current iLSimulation waveform.As seen from Figure 11, with
Input voltage increase, input current abnormality also increases therewith.
Figure 13 and Figure 14 difference VinDuring=110V and VinDuring=264V, DCM Boost PFCs of the invention become
The input ac voltage v of parallel operationin, input current iin, inductive current iLSimulation waveform.As seen from Figure 14, input voltage
During increase, the input currents of DCM Boost power factor correcting converters of the invention still close to sine.
Claims (3)
1. a kind of control method of DCM Boost power factor correcting converters, it is characterised in that comprise the following steps：
Detect the output voltage V of DCM Boost power factor correcting converterso, with reference voltage VrefError is carried out to amplify to obtain
Error amplification signal VEA；
Passing ratio coefficient kiObtain control signal Vcon_i, i.e. Vcon_i=kiVEA；The proportionality coefficient
Wherein Vm_maxFor the peak value of maximum input voltage, MiFor input voltage border coefficient, i=0,1,2 ..., n；
By control signal Vcon_iRespectively compared with sawtooth waveforms, control pulse P is producedi；
When each switch periods start, the input voltage v after DCM Boost power factor correcting converter rectifications is detectedrecAnd
With input voltage border ViIt is compared：Work as Vi≤vecr＜ Vi+1When, select PiAs effective control pulse；Work as vrec≥VnWhen,
Select PnAs effective control pulse；The input voltage border Vi=MiVm_max, the effectively control pulse is for controlling DCM
The switching tube conducting of Boost power factor correcting converters.
2. control method as claimed in claim 1, it is characterised in that the voltage border coefficient
3. a kind of control circuit of DCM Boost power factor correcting converters, it is characterised in that including input voltage determining device
(100) pulse generator (200) and control pulse selector (300), are controlled；
The input voltage determining device (100) includes first comparator B10, B11..., B1nWith d type flip flop D1, D2..., Dn；First
Comparator B10Positive input terminal be used for connecting valve period detecting signal VPC, negative input end is for connecting sawtooth waveforms vsaw, output
End is connected to d type flip flop D1, D2..., DnCLK ends；First comparator B11..., B1nPositive input terminal be respectively used to connect it is defeated
Enter voltage border Vi, i=1,2 ..., n, negative input end be respectively used to connect DCM Boost power factor correcting converter rectifications
Input voltage v afterwardsrec, output end is connected respectively d type flip flop D1, D2..., DnD ends；
The control pulse generator (200) includes error amplifier, potential-divider network K0, K1..., KnWith the second comparator B20,
B21..., B2n；The negative input end of error amplifier is used for the output electricity for connecting the DCMBoost power factor correcting converters
Press Vo, positive input terminal is for connecting reference voltage Vref, output end is connected to potential-divider network K0, K1..., KnInput；Partial pressure
Network K0, K1..., KnOutput end be connected respectively to the second comparator B20, B21..., B2nPositive input terminal；Second compares
Device B20, B21..., B2nNegative input end be used for connect sawtooth waveforms vsaw；The potential-divider network K0, K1..., KnProportionality coefficient point
Wei not k0, k1... kn；
The control pulse selector (300) includes and door Y0, Y1..., YnAnd OR gate；With door Y1Input be connected respectively to D
Trigger D1QN ends, d type flip flop D2Q ends and the second comparator B21Output end；With door Y2Input be connected respectively to D
Trigger D2QN ends, d type flip flop D3Q ends and the second comparator B22Output end；With door Y3..., Yn-1With d type flip flop and
The annexation of two comparators is by that analogy；With door Y0Input be connected respectively to d type flip flop D1Q ends and the second comparator
B20Output end；With door YnInput be connected respectively to d type flip flop DnQN ends and the second comparator B2nOutput end；With door
Y0, Y1..., YnOutput end be connected respectively to the input of OR gate, the output end of OR gate be used to connecting DCM Boost power because
The switching tube of number correcting converter.
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| CN201710803670.0A CN107465341B (en) | 2017-09-08 | 2017-09-08 | Control method and control circuit of DCMBoost power factor correction converter |
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| CN107465341B (en) | 2023-04-11 |
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