CN203039586U - Wide-load-range low-voltage stress flyback converter - Google Patents
Wide-load-range low-voltage stress flyback converter Download PDFInfo
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- CN203039586U CN203039586U CN2012205904051U CN201220590405U CN203039586U CN 203039586 U CN203039586 U CN 203039586U CN 2012205904051 U CN2012205904051 U CN 2012205904051U CN 201220590405 U CN201220590405 U CN 201220590405U CN 203039586 U CN203039586 U CN 203039586U
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- switching tube
- power factor
- factor correction
- converter
- voltage stress
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model discloses a wide-load-range low-voltage stress flyback converter. A switching tube Q2 is serially connected between a switching tube Q1 of a flyback power factor correction converter and a primary winding end 2 of a flyback transformer T; the anode of a power diode D6 is connected between the switching tube Q1 and the switching tube Q2; and the cathode of the power diode D6 is connected with a primary winding end 1 of the flyback transformer T. By adopting the design, the loading capacity of the traditional flyback power factor correction converter is broadened. On the premise of the same main circuit parameters, the load range of the traditional flyback power factor correction converter can be improved and the voltage stress born by the switching tubes which are connected with the primary winding of the transformer is reduced. Meanwhile, it can be ensured that unit power factors are obtained within the entire input voltage range.
Description
Technical field
The utility model relates to a kind of electric control appliance, especially a kind of control method of anti-excited power factor correcting and device thereof.
Background technology
In recent years, power electronic technology develops rapidly, becomes the focus of application and research gradually as the power technology of field of power electronics important component part.Switching Power Supply is high and established its dominant position in field of power supplies with its efficient height, power density, but can there be a fatal weakness in it when inserting electrical network by rectifier: power factor lower (generally only being 0.45～0.75), and in electrical network, can produce a large amount of current harmonicss and reactive power and pollute electrical network.The method that suppresses Switching Power Supply generation harmonic wave mainly contains two kinds: the one, and passive means namely adopts passive filtering or active filter circuit to come bypass or harmonic carcellation; The 2nd, active method namely designs high-performance rectifier of new generation, it have input current for sinusoidal wave, harmonic content is low and characteristics such as power factor height, namely has power factor emendation function.Switch power supply power factor is proofreaied and correct the emphasis of research, mainly is the research of circuit of power factor correction topology and the exploitation of Power Factor Correction Control integrated circuit.Traditional APFC generally adopts the Boost-topology of boosting, this be because Boost have control easily, drive simple and power factor can be close to 1, but the Boost power factor correction has the high shortcoming of output voltage.In low power application scenario, Buck-buck topology and anti exciting converter often use, but when the Buck circuit was realized PFC, owing to when input voltage is lower than output voltage, do not transmit energy, input current was 0, and intermodulation distortion is serious.And anti exciting converter can transmit energy in whole power frequency period, and power factor and total harmonic distortion all are better than the Buck converter.Anti-excited power factor correcting device has discontinuous mode and two kinds of mode of operations of critical flow Discontinuous Conduction mode usually.The anti-excited power factor correcting of discontinuous mode device can obtain unity power factor, but its peak current is very big, makes the conduction loss increase of switching tube and influences transducer effciency; The anti-excited power factor correcting of critical flow Discontinuous Conduction mode device, its ON time is fixed in a power frequency period, though efficient is than the anti-excited power factor correcting of discontinuous mode device height, but can not obtain unity power factor, power factor and total harmonic distortion are all poor than the anti-excited power factor correcting of discontinuous mode device.
The technical scheme that the utility model adopts is based on that the process patent application that proposes simultaneously in present patent application with the applicant proposes.
The utility model content
The purpose of this utility model provides a kind of anti-excited power factor correction converter of novelty, adopts said method to make anti-excited power factor correction converter obtain unity power factor, lower switch tube voltage stress and wideer loading range.
The utility model realizes that the means of utility model purpose are:
Switching tube Q at anti-excited power factor correction converter
1With the switching tube Q that connects between former limit winding 2 ends of anti-violent change depressor T
2, switching tube Q
1With switching tube Q
2Between connect power diode D
6Anode, power diode D
6Negative electrode connect 1 end of the former limit of anti-violent change depressor T winding.
Like this, by R
1And R
2The output voltage sampling of forming is to converter output voltage v
o(t) negative terminal of sampling back input operational amplifier, the anode input reference voltage signal V of operational amplifier
Ref, through operational amplifier output compensating control signal V after the compensating network
CompSawtooth waveforms and the compensating control signal V of saw-toothed wave generator output
CompAnode and the negative terminal of difference input comparator 1.Be input to half-bridge drive circuit behind the output signal process RS-trigger 1 of comparator 1, after drive circuit amplifies, export to switching tube Q
1When the sawtooth voltage of saw-toothed wave generator output greater than compensating control signal V
CompThe time switching tube Q
1Turn-off, when the sawtooth voltage of saw-toothed wave generator output less than compensating control signal V
CompThe time switching tube Q
1Conducting; And the setting compensation network makes the cut-off frequency of whole voltage control loop much smaller than power frequency, then the compensating control signal V of operational amplifier output
CompIn half power frequency period, remain unchanged.Input voltage v
In(t) with load current i
o(t) the anti-other input sine wave generation circuit of signal, the sine wave signal of generation is input to the negative terminal of comparator 2, and the anode input signal of comparator 2 is anti-violent change depressor secondary output current signal i
L2(t).RS-trigger 2 is passed through or imported behind the door to the output signal of the output signal of comparator 2 and comparator 1, and its output is exported to switching tube Q after amplifying through half-bridge drive circuit again
2As seen, adopt above device can realize the utility model method of filing an application on the same day with the application applicant easily and reliably.
Compared with prior art, the beneficial effects of the utility model are:
1, with respect to traditional anti-excited power factor correction converter, adopt the anti-excited power factor correction converter of low voltage stress and the control thereof of wide loading range of the present utility model, can obtain unity power factor and littler total harmonic distortion; 2, with respect to traditional anti-excited power factor correction converter, adopt the anti-excited power factor correction converter of low voltage stress and the control thereof of wide loading range of the present utility model, under same main circuit parameter condition, go for more powerful power factor correcting converter, under the situation that obtains same high power factor, can obtain higher efficient.3, with respect to traditional anti-excited power factor correction converter, adopt the anti-excited power factor correction converter of low voltage stress and the control thereof of wide loading range of the present utility model, can reduce the voltage stress that switching tube bears, reduced the selection difficulty of switching tube, reduced the converter cost simultaneously and improved efficient.
Description of drawings
Fig. 1 is the anti-excited power factor correction converter of the low voltage stress of wide loading range system architecture diagram.
Fig. 2 is the main oscillogram of classical inverse excited power factor correction converter under the 100W bearing power.
Fig. 3 is the main oscillogram of classical inverse excited power factor correction converter under the 200W bearing power.
Fig. 4 is the main oscillogram of the utility model embodiment one under the 100W bearing power.
Fig. 5 is the main oscillogram of the utility model embodiment one under the 200W bearing power.
Fig. 6 is the electrical block diagram of the utility model embodiment two.
Embodiment
Also by reference to the accompanying drawings the utility model is done further detailed description below by concrete example.
Embodiment one
Fig. 1 illustrates, and a kind of embodiment of the present utility model is, topological structure and the control method of the anti-excited power factor correction converter of a kind of low voltage stress of wide loading range, and its concrete practice is:
Switching tube Q at classical inverse excited power factor correction converter
1With the switching tube Q that connects between former limit winding 2 ends of anti-violent change depressor T
2, switching tube Q
1With switching tube Q
2Between connect power diode D
6Anode, power diode D
6Negative electrode connect 1 end of the former limit of anti-violent change depressor T winding.
By R
1And R
2The output voltage sampling of forming is to converter output voltage v
o(t) negative terminal of sampling back input operational amplifier, the anode input reference voltage signal V of operational amplifier
Ref, through operational amplifier output compensating control signal V after the compensating network
CompSawtooth waveforms and the compensating control signal V of saw-toothed wave generator output
CompAnode and the negative terminal of difference input comparator 1.Be input to half-bridge drive circuit behind the output signal process RS-trigger 1 of comparator 1, after drive circuit amplifies, export to switching tube Q
1When the sawtooth voltage of saw-toothed wave generator output greater than compensating control signal V
CompThe time switching tube Q
1Turn-off, when the sawtooth voltage of saw-toothed wave generator output less than compensating control signal V
CompThe time switching tube Q
1Conducting; And the setting compensation network makes the cut-off frequency of whole voltage control loop much smaller than power frequency, then the compensating control signal V of operational amplifier output
CompIn half power frequency period, remain unchanged.Input voltage v
In(t) with load current i
o(t) the anti-other input sine wave generation circuit of signal, the sine wave signal of generation is input to the negative terminal of comparator 2, and the anode input signal of comparator 2 is anti-violent change depressor secondary output current signal i
L2(t).RS-trigger 2 is passed through or imported behind the door to the output signal of the output signal of comparator 2 and comparator 1, and its output is exported to switching tube Q after amplifying through half-bridge drive circuit again
2
Utilize the SIMetrix/SIMPLIS simulation software respectively classical inverse excited power factor correction converter and the utility model embodiment one to be advanced the school time-domain-simulation, the simulation result waveform is as follows:
Fig. 2 is the time-domain-simulation waveform of classical inverse excited power factor correction converter under the 100W bearing power, is followed successively by switching tube Q from top to bottom
1The voltage stress waveform, output voltage waveforms, the input voltage waveform that bear close input current waveform.As can be seen from Figure 2, input current has well been followed the tracks of the waveform of input voltage, and this power supply has very high power factor.This moment anti-excited power factor correction converter output voltage stabilization at 48V, switching tube Q during stable state
1The maximum voltage stress that bears is 300V.
Fig. 3 is the time-domain-simulation waveform of classical inverse excited power factor correction converter under the 200W bearing power, is followed successively by switching tube Q from top to bottom
1The voltage stress waveform, output voltage waveforms, the input voltage waveform that bear close input current waveform.As can be seen from Figure 3, when bearing power increased, input current distorted near peak point, can't follow the tracks of the waveform of input voltage, had reduced the power factor of power supply.This moment anti-excited power factor correction converter output voltage stabilization at 48V, switching tube Q during stable state
1The maximum voltage stress that bears is 450V.
Fig. 4 is the time-domain-simulation waveform of the utility model embodiment one under the 100W bearing power, is followed successively by switching tube Q from top to bottom
2The voltage stress waveform that bears, switching tube Q
1The voltage stress waveform, output voltage waveforms, the input voltage waveform that bear close input current waveform.As can be seen from Figure 4, input current has well been followed the tracks of the waveform of input voltage, and this power supply has very high power factor.This moment anti-excited power factor correction converter output voltage stabilization at 48V, switching tube Q during stable state
1The maximum voltage stress that bears is 180V, switching tube Q during stable state
1The maximum voltage stress that bears is 140V.
Fig. 5 is the time-domain-simulation waveform of the utility model embodiment one under the 200W bearing power, is followed successively by switching tube Q from top to bottom
2The voltage stress waveform that bears, switching tube Q
1The voltage stress waveform, output voltage waveforms, the input voltage waveform that bear close input current waveform.As can be seen from Figure 5, the input current of the utility model embodiment one had still well been followed the tracks of the waveform of input voltage when load increased, and this power supply has very high power factor.This moment anti-excited power factor correction converter output voltage stabilization at 48V, switching tube Q during stable state
1The maximum voltage stress that bears is 200V, switching tube Q during stable state
1The maximum voltage stress that bears is 140V.
By Fig. 2～Fig. 5 as can be seen, classical inverse excited power factor correction converter can't operate as normal under the 200W bearing power; But under same main circuit parameter condition, the utility model embodiment one can realize that all input current well followed the tracks of the waveform of input voltage under 100W and 200W bearing power, have very high power factor, and switching tube Q
1With Q
2The voltage stress that bears is all less than switching tube Q in the classical inverse excited power factor correction converter
1The voltage stress that bears.
Embodiment two
Fig. 6 illustrates, and this example is compared with embodiment one, and difference is: the power factor correcting converter of Switching Power Supply is forward converter.Control mode and the course of work and embodiment one are similar.Can prove that equally it can realize the purpose of this utility model by simulation result.
The Switching Power Supply that the anti-excited power factor correction converter of the utility model in can be used for above embodiment formed, also can be used for the power factor Switching Power Supply of isolated form power factor correction converter circuit compositions such as normal shock power factor correcting converter.
Claims (1)
1. the low voltage stress anti exciting converter of a wide loading range is characterized in that, at the switching tube Q of anti-excited power factor correction converter
1With the switching tube Q that connects between former limit winding 2 ends of anti-violent change depressor T
2, switching tube Q
1With switching tube Q
2Between connect power diode D
6Anode, power diode D
6Negative electrode connect 1 end of the former limit of anti-violent change depressor T winding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012205904051U CN203039586U (en) | 2012-11-09 | 2012-11-09 | Wide-load-range low-voltage stress flyback converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012205904051U CN203039586U (en) | 2012-11-09 | 2012-11-09 | Wide-load-range low-voltage stress flyback converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203039586U true CN203039586U (en) | 2013-07-03 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012205904051U Expired - Fee Related CN203039586U (en) | 2012-11-09 | 2012-11-09 | Wide-load-range low-voltage stress flyback converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203039586U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105186861A (en) * | 2015-08-07 | 2015-12-23 | 西南交通大学 | Pseudo continuous conduction mode switch converter set follow current duty ratio control method and apparatus |
| CN104167914B (en) * | 2014-09-10 | 2016-11-30 | 西南石油大学 | High power factor converter |
-
2012
- 2012-11-09 CN CN2012205904051U patent/CN203039586U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104167914B (en) * | 2014-09-10 | 2016-11-30 | 西南石油大学 | High power factor converter |
| CN105186861A (en) * | 2015-08-07 | 2015-12-23 | 西南交通大学 | Pseudo continuous conduction mode switch converter set follow current duty ratio control method and apparatus |
| CN105186861B (en) * | 2015-08-07 | 2017-11-14 | 西南交通大学 | Pseudo- continuous conduction mode switch converters determine afterflow Duty ratio control method and its device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130703 Termination date: 20151109 |
|
| EXPY | Termination of patent right or utility model |