CN104578797A - Method and device for controlling discontinuous mode flyback converter with high power factor and high efficiency - Google Patents
Method and device for controlling discontinuous mode flyback converter with high power factor and high efficiency Download PDFInfo
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- CN104578797A CN104578797A CN201410768023.7A CN201410768023A CN104578797A CN 104578797 A CN104578797 A CN 104578797A CN 201410768023 A CN201410768023 A CN 201410768023A CN 104578797 A CN104578797 A CN 104578797A
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- power factor
- voltage
- discontinuous mode
- circuit
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Classifications
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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
- H02M1/42—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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
-
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a method and a device for controlling a discontinuous mode flyback converter with high power factor and high efficiency. A transformer secondary side of a traditional discontinuous mode flyback power factor correction converter is in series connection with a resonant capacitor and in parallel connection with a fast recovery diode, so that resonance occurs through leakage inductance of the resonant capacitor and the transformer secondary side, and thus the energy of leakage inductance is completely absorbed and utilized, the work efficiency of the converter is greatly improved, and the voltage stresses of a primary side switch tube and a secondary side diode are reduced. Moreover, by controlling the conduction duty cycle of the primary side switch tube of a discontinuous mode secondary resonance flyback converter, the conduction duty cycle of the switch tube changes along with the change of input voltage and output voltage in a power frequency period. The discontinuous mode flyback power factor correction converter can obtain high power factor and high efficiency in the whole input voltage range.
Description
Technical field
The present invention relates to electric control appliance, especially a kind of control method of flyback power factor correction converter and device thereof.
Background technology
In recent years, power electronic technology develops rapidly, and the power technology as field of power electronics important component part becomes the focus of application and research gradually.The feature that Switching Power Supply is high with its efficiency, power density is high and establish its dominant position in field of power supplies, but it can exist a fatal weakness by during rectifier access electrical network: power factor lower (being generally only 0.45 ~ 0.75), and a large amount of current harmonicss and reactive power can be produced and pollute electrical network in electrical network.It is passive means that the method suppressing Switching Power Supply to produce harmonic wave mainly contains two kinds: one, namely adopts passive filtering or active filter circuit to come bypass or harmonic carcellation; Two is active methods, namely designs high-performance rectifier of new generation, and it has, and input current is sine wave, harmonic content is low and power factor high, namely has power factor emendation function.Switch power supply power factor corrects the emphasis mainly research of circuit of power factor correction topology and the exploitation of Power Factor Correction Control integrated circuit of research.Traditional APFC generally adopts Boost-Boost topology, this is because Boost has and controls easily, drives simple and power factor can close to the advantage such as 1, but Boost power factor correcting converter is when low output voltage, its power factor is but very low.In low power application scenario, main adopt Buck-buck topology and anti exciting converter, but when Buck circuit realiration PFC, due to when the input voltage is lower than the output voltage, not transferring energy, input current is 0, and intermodulation distortion is serious; And anti exciting converter can transferring energy in whole power frequency period, power factor and total harmonic distortion are all better than Buck converter, are therefore more applicable in the middle of PFC field.Flyback power factor correction converter has discontinuous mode and critical continuous conduction mode two kinds of mode of operations usually.The control of traditional critical continuous conduction mode flyback power factor correction converter is complicated, and input current abnormality is serious, and therefore the flyback power factor correction converter applications of discontinuous mode is more extensive.Traditional discontinuous mode flyback power factor correction converter can obtain unity power factor automatically, but due to its larger peak current, makes the conduction loss of former limit switching tube, secondary side diode very large thus affect the efficiency of converter.The control mode of traditional discontinuous mode flyback power factor correction converter as shown in Figure 1, adopts the control method of univoltage ring, keeps former limit switching tube duty ratio constant, makes converter obtain unity power factor; But because the leakage inductance of transformer absorbs part energy and can not be utilized, cause the operating efficiency of converter very low.
Summary of the invention
The object of this invention is to provide a kind of topology and control method of flyback power factor correction converter of novelty, adopt this topological structure and control method that flyback power factor correction converter can be made to obtain High Power Factor and high efficiency.
The present invention realizes its goal of the invention, and the technical scheme adopted is a kind of control device of High Power Factor high efficiency anti exciting converter of discontinuous mode, and its concrete practice is:
A control device for the High Power Factor high efficiency anti exciting converter of discontinuous mode, the control circuit of anti exciting converter comprises output voltage sampling circuit; Error amplifier circuit; Pwm pulse produces circuit; Duty ratio computing circuit; Wherein, flyback transformer secondary is connected an a resonant capacitance Cr and fast recovery diode D in parallel
01, resonant capacitance and transformer secondary leakage inductance L
lkthere is resonance, the energy in leakage inductance is all absorbed; Pwm pulse produces circuit and is made up of comparator and saw-toothed wave generator; The negative input of error amplifier is by R
7and R
8the output voltage of resistor voltage divider network sampling, the positive input of error amplifier is reference voltage V
ref, the output signal of sampling produces the output signal V of error amplifier compared with reference voltage
comp; The output V of duty ratio computing circuit
dt () is connected to the negative terminal that pwm pulse produces comparator in circuit, the output signal of saw-toothed wave generator is connected to the anode that pwm pulse produces comparator in circuit.
Another object of the present invention is to provide a kind of control method of High Power Factor high efficiency anti exciting converter of discontinuous mode, and said apparatus is for implementing hardware, and its concrete scheme is:
A kind of control method of High Power Factor high efficiency anti exciting converter of discontinuous mode, adopt described device, adopt the operation method of duty ratio computing circuit to realize conducting duty ratio to change along with the change of input voltage and output voltage in half power frequency period, thus acquisition High Power Factor, comprise following processing procedure: 2 times of turn ratio n with output voltage V
ovalue 2n*V after being multiplied
o, subtract input voltage V respectively
inthe instantaneous value of (t) and K
0input voltage peak K doubly
0* V
m, the result of subtracting each other again with D
0the output voltage V of times error amplifier
compbe multiplied, after the computing of duty ratio computing circuit, the former limit switching tube conducting duty ratio of the flyback power factor correction device of discontinuous mode changes along with the change of input voltage and output voltage in half power frequency period, thus obtains High Power Factor; Wherein turn ratio n is the transformer primary side umber of turn of anti exciting converter and the ratio of the vice-side winding number of turn.
In reality is implemented, turn ratio n and output voltage V
ovalue n*V after being multiplied
o, also assist winding to obtain by anti exciting converter, n*V
o=n*V
cc/ n
as, wherein V
ccfor the auxiliary winding voltage of anti exciting converter, n
asfor anti exciting converter assists the ratio of winding and the vice-side winding number of turn.
Compared with prior art, the invention has the beneficial effects as follows:
Relative to the flyback power factor correction converter of traditional discontinuous mode, adopt topology and the control mode thereof of discontinuous mode High Power Factor high efficiency anti exciting converter of the present invention, higher operating efficiency can be obtained, also retains the High Power Factor of traditional discontinuous mode working method and the feature of low total harmonic distortion simultaneously.
Another object of the present invention is to provide a kind of device realizing above High Power Factor and highly efficient process.It specifically constructs employing:
The control circuit of the High Power Factor high efficiency anti exciting converter of discontinuous mode comprises output voltage sampling and produces circuit, duty ratio computing circuit and drive circuit with error amplifier circuit, pwm pulse; Wherein pwm pulse generation circuit is made up of comparator and saw-toothed wave generator; The negative input of error amplifier is by R
7and R
8the output voltage of resistor voltage divider network sampling, the positive input of error amplifier is reference voltage V
ref, the output signal of sampling produces the output signal V of error amplifier compared with reference voltage
comp; The output V of duty ratio computing circuit
dt () is connected to the negative terminal that pwm pulse produces comparator in circuit, the output signal of saw-toothed wave generator is connected to the anode that pwm pulse produces comparator in circuit; Visible, adopt above device can realize the above method of the present invention easily and reliably.
Accompanying drawing explanation
Fig. 1 is the system architecture diagram of the flyback power factor correction converter of traditional discontinuous mode.
Fig. 2 is the system architecture diagram of the High Power Factor high efficiency anti exciting converter of discontinuous mode of the present invention.
The operation mode oscillogram of the switch periods that Fig. 3 is circuit block diagram shown in Fig. 2.
Fig. 4 is the electrical block diagram of the invention process example.
Fig. 5 is the input current contrast simulation oscillogram of Fig. 1 tradition flyback power factor correction converter of discontinuous mode and the High Power Factor high efficiency anti exciting converter of Fig. 2 discontinuous mode of the present invention.
Fig. 6 is the former secondary current contrast simulation oscillogram of Fig. 1 tradition flyback power factor correction converter of discontinuous mode and the High Power Factor high efficiency anti exciting converter transformer of Fig. 2 discontinuous mode of the present invention.
Fig. 7 is the PF value contrast of Fig. 1 tradition flyback power factor correction converter of discontinuous mode and the High Power Factor high efficiency anti exciting converter transformer of Fig. 2 discontinuous mode of the present invention.
Fig. 8 is the efficiency comparative of Fig. 1 tradition flyback power factor correction converter of discontinuous mode and the High Power Factor high efficiency anti exciting converter transformer of Fig. 2 discontinuous mode of the present invention.
Embodiment
Below by concrete example with reference, further detailed description is done to the present invention.
Fig. 2 is system architecture diagram of the present invention, and Fig. 4 is a kind of embodiment of the present invention, the topological structure of the High Power Factor high efficiency anti exciting converter of discontinuous mode and control method.
Its connected mode is: by R
1and R
2the input voltage of resistor voltage divider network sampling is connected to operational amplifier 1 (voltage follower); The output of operational amplifier 1 is connected to peak value computing network, and the crest voltage that peak value computing network obtains is connected to operational amplifier 2 (voltage follower); The output of operational amplifier 1,2 is respectively by resistance R
4and R
5be connected to the negative input of operational amplifier 3; The auxiliary winding voltage of transformer is by being connected to the positive input of operational amplifier 3 after diode rectification.By R
7and R
8the output voltage of resistor voltage divider network sampling is connected to the negative input of error amplifier, and the positive input of error amplifier is reference voltage; The output of error amplifier and operational amplifier 3 is connected respectively to two inputs of multiplier; The output of triangular-wave generator and multiplier is connected respectively to the positive-negative input end of comparator, and the output of comparator is connected to the drive end of switching tube.
Its concrete practice is: the control circuit of anti exciting converter comprises output voltage sampling and produces circuit, duty ratio computing circuit and drive circuit with error amplifier circuit, pwm pulse.The negative input of error amplifier is by R
7and R
8the output voltage of resistor voltage divider network sampling, the positive input of error amplifier is reference voltage V
ref, the output signal of sampling produces the output signal V of error amplifier compared with reference voltage
comp.Switching tube conducting duty ratio computing circuit has input voltage V
in(t), output voltage V
owith the output signal V of error amplifier
compthree road input signals, duty ratio computing circuit comprises 3 operational amplifiers, 1 multiplier and some resistor networks; Input voltage V after rectification
int () is through R
1, R
2dividing potential drop, then after the voltage follower be made up of operational amplifier 1, obtain V
a=K*V
int (), K is R
1, R
2the dividing potential drop coefficient of voltage network; V
aalso its peak value V is obtained by the voltage follower be made up of operational amplifier 2 by peak value computing network
m, gather former limit and assist voltage V on winding
ccreplace output voltage V
o, V
cc=n
a* V
o/ n
s; R
4, R
5, R
6jointly adder is formed, V with operational amplifier 3
a, V
mand V
ccsimultaneously as the input of adder, by setting K, R
4, R
5, R
6, n
aand n
p, make it meet: R
6* (1/R
4+ 1/R
5+ 1/R
6)=2*n
p/ n
a, K*R
6/ R
5=K
0, K*R
6/ R
4=1, n
p, n
afor transformer primary side, auxiliary limit umber of turn.The output V of adder
yand V
compbe connected respectively to the input of multiplier, the output signal of multiplier is the output signal V of duty ratio computing circuit
d(t); The output V of duty ratio computing circuit
dt () signal is connected to the negative terminal that pwm pulse produces comparator in circuit, pwm pulse produces the output signal of the anode access saw-toothed wave generator of comparator in circuit, as the output signal V of duty ratio computing circuit
dwhen () is greater than the output signal of saw-toothed wave generator t, switching tube Q conducting; Otherwise switching tube Q turns off.The conducting duty ratio of anti exciting converter former limit switching tube is by output voltage error amplifier V
comp, input voltage V
in(t) and output voltage V
ocontrol; The compensation of specification error amplifier circuit makes the cut-off frequency of whole loop much smaller than power frequency (being generally 10 ~ 20Hz), error amplifier output signal V
compremain unchanged in half power frequency period.
Fig. 5 and Fig. 6 is the simulation waveform utilizing PSIM simulation software to obtain.As can be seen from Figure 5: the input current of the flyback power factor correction converter of traditional discontinuous mode is from motion tracking input voltage waveform, and power factor is higher; The input current adopting variable duty cycle to control the High Power Factor high efficiency anti exciting converter of discontinuous mode has also followed the tracks of the waveform of input voltage well, has higher power factor.As can be seen from Figure 6: the ON time of traditional discontinuous mode flyback power factor correction converter is constant, and namely duty ratio is constant; And the duty ratio real-time change of discontinuous mode High Power Factor high efficiency anti exciting converter of the present invention, its value and input voltage instantaneous value, output voltage are relevant.
Fig. 7 is the PF value contrast of the flyback power factor correction converter of traditional discontinuous mode and the High Power Factor high efficiency anti exciting converter of discontinuous mode of the present invention.As can be seen from Figure 7: converter of the present invention remains the feature of the High Power Factor of conventional transducers substantially.
The efficiency comparative of Fig. 8 tradition flyback power factor correction converter of discontinuous mode and the High Power Factor high efficiency anti exciting converter of discontinuous mode of the present invention.As can be seen from Figure 8: under two kinds of duplicate conditions of transducer parameters, the operating efficiency of the High Power Factor high efficiency anti exciting converter of discontinuous mode of the present invention is greatly improved compared to the flyback power factor correction converter of traditional discontinuous mode.
Claims (4)
1. a control device for the High Power Factor high efficiency anti exciting converter of discontinuous mode, it is characterized in that, the control circuit of anti exciting converter comprises: output voltage sampling circuit; Error amplifier circuit; Pwm pulse produces circuit; Duty ratio computing circuit; Wherein, flyback transformer secondary is connected an a resonant capacitance Cr and fast recovery diode D in parallel
01, resonant capacitance and transformer secondary leakage inductance L
lkthere is resonance, the energy in leakage inductance is all absorbed; Pwm pulse produces circuit and is made up of comparator and saw-toothed wave generator; The negative input of error amplifier is by R
7and R
8the output voltage of resistor voltage divider network sampling, the positive input of error amplifier is reference voltage V
ref, the output signal of sampling produces the output signal V of error amplifier compared with reference voltage
comp; The output V of duty ratio computing circuit
dt () is connected to the negative terminal that pwm pulse produces comparator in circuit, the output signal of saw-toothed wave generator is connected to the anode that pwm pulse produces comparator in circuit.
2. the control device of the High Power Factor high efficiency anti exciting converter of discontinuous mode according to claim 1, it is characterized in that, the concrete structure of described duty ratio computing circuit is: by R
1and R
2the input voltage of resistor voltage divider network sampling is connected to operational amplifier 1; The output of operational amplifier 1 is connected to peak value computing network, and the crest voltage that peak value computing network obtains is connected to operational amplifier 2; The output of operational amplifier 1 and 2 is respectively by resistance R
4and R
5be connected to the negative input of operational amplifier 3; The auxiliary winding voltage of transformer is by being connected to the positive input of operational amplifier 3 after diode rectification; By R
7and R
8the output voltage of resistor voltage divider network sampling is connected to the negative input of error amplifier, and the positive input of error amplifier is reference voltage; The output of error amplifier and operational amplifier 3 is connected respectively to two inputs of multiplier; The output of triangular-wave generator and multiplier is connected respectively to the positive-negative input end of comparator, and the output of comparator is connected to the drive end of switching tube.
3. the control method of the High Power Factor high efficiency anti exciting converter of a discontinuous mode, adopt device described in claim 1, adopt the operation method of duty ratio computing circuit to realize conducting duty ratio to change along with the change of input voltage and output voltage in half power frequency period, thus acquisition High Power Factor, comprise following processing procedure: 2 times of turn ratio n with output voltage V
ovalue 2n*V after being multiplied
o, subtract input voltage V respectively
inthe instantaneous value of (t) and K
0input voltage peak K doubly
0* V
m, the result of subtracting each other again with D
0the output voltage V of times error amplifier
compbe multiplied, after the computing of duty ratio computing circuit, the former limit switching tube conducting duty ratio of the flyback power factor correction device of discontinuous mode changes along with the change of input voltage and output voltage in half power frequency period, thus obtains High Power Factor; Wherein turn ratio n is the transformer primary side umber of turn of anti exciting converter and the ratio of the vice-side winding number of turn.
4. the control method of the High Power Factor high efficiency anti exciting converter of discontinuous mode according to claim 3, is characterized in that, turn ratio n and output voltage V
ovalue n*V after being multiplied
o, also assist winding to obtain by anti exciting converter, n*V
o=n*V
cc/ n
as, wherein V
ccfor the auxiliary winding voltage of anti exciting converter, n
asfor anti exciting converter assists the ratio of winding and the vice-side winding number of turn.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410768023.7A CN104578797B (en) | 2014-12-12 | 2014-12-12 | Method and device for controlling discontinuous mode flyback converter with high power factor and high efficiency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410768023.7A CN104578797B (en) | 2014-12-12 | 2014-12-12 | Method and device for controlling discontinuous mode flyback converter with high power factor and high efficiency |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104578797A true CN104578797A (en) | 2015-04-29 |
| CN104578797B CN104578797B (en) | 2017-05-17 |
Family
ID=53094182
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410768023.7A Expired - Fee Related CN104578797B (en) | 2014-12-12 | 2014-12-12 | Method and device for controlling discontinuous mode flyback converter with high power factor and high efficiency |
Country Status (1)
| Country | Link |
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| CN (1) | CN104578797B (en) |
Cited By (4)
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|---|---|---|---|---|
| CN109088536A (en) * | 2017-06-13 | 2018-12-25 | 华润矽威科技（上海）有限公司 | Improve active power factor correction circuit, method and the drive system of harmonic wave |
| CN109314398A (en) * | 2016-06-02 | 2019-02-05 | Ntn株式会社 | Battery charger |
| CN110829824A (en) * | 2019-10-25 | 2020-02-21 | 东南大学 | Single-cycle PF controller based on Boost circuit |
| CN112491251A (en) * | 2020-12-09 | 2021-03-12 | 华中科技大学 | Integrated resonant driving circuit with adjustable duty ratio and control method |
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| CN110829824A (en) * | 2019-10-25 | 2020-02-21 | 东南大学 | Single-cycle PF controller based on Boost circuit |
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| CN112491251B (en) * | 2020-12-09 | 2021-12-03 | 华中科技大学 | Integrated resonant driving circuit with adjustable duty ratio and control method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104578797B (en) | 2017-05-17 |
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