CN110739843A - Passive power factor correction circuit for flyback switching power supply - Google Patents
Passive power factor correction circuit for flyback switching power supply Download PDFInfo
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- CN110739843A CN110739843A CN201911031110.3A CN201911031110A CN110739843A CN 110739843 A CN110739843 A CN 110739843A CN 201911031110 A CN201911031110 A CN 201911031110A CN 110739843 A CN110739843 A CN 110739843A
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- 239000003990 capacitor Substances 0.000 claims description 87
- 238000004804 winding Methods 0.000 claims description 33
- 238000001914 filtration Methods 0.000 claims description 6
- 229910044991 metal oxide Inorganic materials 0.000 claims description 4
- 150000004706 metal oxides Chemical class 0.000 claims description 4
- 239000004065 semiconductor Substances 0.000 claims description 4
- 230000010355 oscillation Effects 0.000 description 15
- 239000004973 liquid crystal related substance Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
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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
- 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
- H02M1/4266—Arrangements for improving power factor of AC input using passive elements
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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
- H02M1/12—Arrangements for reducing harmonics from AC input or output
- H02M1/126—Arrangements for reducing harmonics from AC input or output using passive filters
-
- 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
- H02M3/33507—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 with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—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 with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
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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
- 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
- H02M3/33569—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 having several active switching elements
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention relates to the field of switching power supplies, and discloses passive power factor correction circuits for flyback switching power supplies, which are used for solving the problems of complex structure, difficult debugging and high cost of an active power factor correction circuit.
Description
Technical Field
The invention relates to the field of switching power supplies, in particular to a passive power factor correction circuit for a flyback switching power supply.
Background
With the continuous development of liquid crystal display technology, liquid crystal televisions with large size of more than 50 inches, high resolution of more than 4KX2K and the like gradually become popular, the power consumption of the whole liquid crystal television is increased, and therefore the power supply of the liquid crystal television is required to increase the output power and has the function of power factor correction. The high-power supply has low input current harmonic distortion and is beneficial to improving the power supply efficiency of a power grid.
The existing high-power liquid crystal television power supply comprises a double flyback power supply and a power factor correction technology of the double flyback power supply, wherein the active power factor correction technology adopts an active circuit correction technology, an MOS (metal oxide semiconductor) tube is controlled by an integrated IC (integrated circuit), and an active circuit is used for boosting through an inductor and a diode, the output current of the IC is adjusted by the circuit according to the change of power supply load power to ensure the stability of the boost circuit, so that the load of an alternating current power supply keeps linear characteristics, the harmonic wave component of the input current of the alternating current power supply is further reduced, the voltage of a power grid is kept stable, and the power supply efficiency of the power grid is improved.
Under the market and technical background conditions, the invention provides a passive power factor correction circuit for a flyback switching power supply, which belongs to the first time not only in the liquid crystal display television industry, but also in other electrical appliance industries and the power supply industry.
Disclosure of Invention
The technical problem to be solved by the invention is to provide passive power factor correction circuits for flyback switching power supplies, which are used for solving the problems of complex structure, difficult debugging and high cost of the active power factor correction circuits.
kinds of passive power factor correction circuit used for flyback switching power supply, including high-frequency filter module, LC oscillating module, voltage transformer, MOS tube and filter capacitor, wherein, the LC oscillating module includes inductor, capacitor and freewheeling diode;
the input end of the high-frequency filter module is used for being connected with the output end of a rectifying device of an alternating current power supply, the output end of the high-frequency filter module is connected with the end of an th inductor, the other end of a th inductor is simultaneously connected with the end of a th capacitor and the anode of a freewheeling diode, two ends of a primary winding of a transformer are respectively connected with the end of a filter capacitor and the drain electrode of an MOS (metal oxide semiconductor) tube, two end points between two ends of the primary winding of the transformer are respectively connected with the other end of a th capacitor and the cathode of the freewheeling diode, and the other end of the.
Further , in order to facilitate the setting of parameters in the device, the primary winding of the transformer can be divided into three equal parts, and two end points between two ends of the primary winding of the transformer are equal division points.
Specifically, the high-frequency filtering module may include an th resistor, a second diode, a second capacitor, a third capacitor, and a fourth capacitor, wherein the 0 end of the th resistor, the anode of the second diode, and the 1 end of the second capacitor are simultaneously connected to the output end of the rectifying device of the ac power supply, the other 2 end of the second capacitor is grounded, the other 4 end of the 3 th resistor is connected to the end of the third capacitor, the other end of the third capacitor, the cathode of the second diode, and the end of the fourth capacitor are simultaneously connected to the end of the th inductor, the other end of the fourth capacitor is connected to the end of the second resistor, and the other end of the second resistor is grounded.
, in order to realize active power factor correction of the dual flyback switching power supply, the transformer may include a th transformer and a second transformer, and correspondingly, the MOS transistor may also include a th MOS transistor and a second MOS transistor, wherein the th transformer and the second transformer may be connected to the LC oscillating module simultaneously, or only of them may be connected to the LC oscillating module.
, if the power of the transformer is larger than that of the second transformer and the power difference reaches 0 fixed value, the 1 transformer and the second transformer can be connected in such a way that the 2 transformer is connected to the LC oscillating module, the two ends of the primary winding of the 3 transformer are respectively connected to the 4 end of the filter capacitor and the drain of the 5MOS transistor, the two ends between the two ends of the primary winding of the transformer are respectively connected to the end of the capacitor and the cathode of the freewheeling diode, the two ends of the primary winding of the second transformer are respectively connected to the end of the filter capacitor and the drain of the second MOS transistor, here, the LC oscillating module is connected to the transformer only, mainly considering the characteristic that the power difference between the two transformer branches in the double flyback switching power supply is large (i.e. the power difference reaches fixed value), wherein the transformer branch with large power (i.e. the transformer branch) plays a main role in forming harmonic current distortion to correct the harmonic current, the harmonic distortion, the signal-to noise ratio of the other transformer branches (i.e. the power difference reaches fixed value transformer branch, the power correction circuit, the waveform distortion is formed, and the correction circuit can be simplified, and the invention can be formed by the invention.
The invention has the advantages that the integrated control IC and the high-power MOS tube in the active power correction circuit are cancelled, the switch oscillation working mode of the switch circuit is formed by the inductor, the diode, the integrated control IC and the high-power MOS tube, but the LC oscillation working mode of the oscillation circuit is formed by connecting the th inductor and the th capacitor in series, and the invention has the advantages of simple structure, easy debugging, low cost and the like.
Drawings
Fig. 1 is a circuit diagram of an embodiment.
In the figure, the number C1 is a capacitor, Ca-Cc are respectively a second capacitor to a fourth capacitor, C2 is a filter capacitor, DP is a rectifying device of an alternating current power supply, Ra-Rb are respectively a th resistor to a second resistor, T1-T2 are respectively a th transformer to a second transformer, Q1-Q2 are respectively a th MOS tube to a second MOS tube, D1 is a freewheeling diode, and Da is a second diode.
Detailed Description
In order to solve the problems of complex structure, difficult debugging and high cost of an active power factor correction circuit, the invention provides passive power factor correction circuit for a flyback switching power supply, which comprises a high-frequency filter module, an LC oscillation module, a transformer, an MOS (metal oxide semiconductor) tube and a filter capacitor, wherein the LC oscillation module comprises a th inductor, a th capacitor and a freewheeling diode, the input end of the high-frequency filter module is used for connecting the output end of a rectifying device of an alternating current power supply, the output end of the high-frequency filter module is connected with a th end of a th inductor, the other end of a th inductor is simultaneously connected with a end of a second capacitor and the anode of the freewheeling diode, the two ends of a primary winding of the transformer are respectively connected with a end of the filter capacitor and the drain electrode of the MOS tube, the two end points between the two ends of the primary winding of the transformer are respectively connected with the other end of the th capacitor and.
According to the flyback switching power supply, the th inductor and the th capacitor are connected in series to generate oscillation, the th capacitor is charged by the th inductor during the conduction period of the MOS transistor, when the conduction voltage of the freewheeling diode is charged, the freewheeling diode discharges in the filter capacitor and continues freewheeling through the inductor of the primary intermediate winding and the negative end winding of the transformer, the freewheeling state continues until the MOS transistor is turned off, and after the MOS transistor is turned off, the energy in the th inductor passes through the freewheeling diode and charges the filter capacitor through the primary winding of the transformer in the boosting process.
Further , in order to facilitate the setting of parameters in the device, the primary winding of the transformer can be divided into three equal parts, and two end points between two ends of the primary winding of the transformer are equal division points.
Specifically, the high-frequency filtering module may include an th resistor, a second diode, a second capacitor, a third capacitor, and a fourth capacitor, wherein the 0 end of the th resistor, the anode of the second diode, and the 1 end of the second capacitor are simultaneously connected to the output end of the rectifying device of the ac power supply, the other 2 end of the second capacitor is grounded, the other 4 end of the 3 th resistor is connected to the end of the third capacitor, the other end of the third capacitor, the cathode of the second diode, and the end of the fourth capacitor are simultaneously connected to the end of the th inductor, the other end of the fourth capacitor is connected to the end of the second resistor, and the other end of the second resistor is grounded.
, in order to realize active power factor correction of the dual flyback switching power supply, the transformer may include a th transformer and a second transformer, and correspondingly, the MOS transistor may also include a th MOS transistor and a second MOS transistor, wherein the th transformer and the second transformer may be connected to the LC oscillating module simultaneously, or only of them may be connected to the LC oscillating module.
, if the transformer is a high-power output circuit and the second transformer is a low-power output circuit, the invention can be connected with only LC oscillation modules, and both the two LC oscillation modules are connected, wherein the LC oscillation modules are connected in the following way:
the th transformer is connected to the LC oscillation module, two ends of the th transformer primary winding are respectively connected with the end of the filter capacitor and the drain of the th MOS tube, two end points between two ends of the th transformer primary winding are respectively connected with the other end of the th capacitor and the cathode of the freewheeling diode, and two ends of the second transformer primary winding are respectively connected with the end of the filter capacitor and the drain of the second MOS tube.
For purposes of promoting an understanding of the objects, aspects and advantages of the invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings and examples, it being understood that the particular examples are illustrative of the invention and are not intended to limit the invention.
Examples
The embodiment provides passive power factor correction circuits for a double flyback switching power supply, and the circuit structure of this example is shown in fig. 1, and the passive power factor correction circuit includes a high-frequency filter module, an LC oscillation module, a transformer, a MOS transistor, and a filter capacitor C2, where the LC oscillation module includes a th inductor L1, a th capacitor C1, and a freewheeling diode D1, the transformer includes a th transformer T1 and a second transformer T2, the MOS transistor a th MOS transistor Q1 and a second MOS transistor Q2, the high-frequency filter module includes a th resistor Ra, a second resistor Rb, a second diode Da, a second capacitor Ca, a third Cb capacitor, and a fourth capacitor Cc;
in the embodiment, the input end of the high-frequency filter module is connected with the output end of a rectifying device of an alternating current power supply, and the output end of the high-frequency filter module is connected with the end of an th inductor L1, wherein the circuit connection mode in the high-frequency filter module is that the 1 end of a 0 th resistor Ra, the anode of a second diode Da and the 2 end of a second capacitor Ca are simultaneously connected with the output end of the rectifying device of the alternating current power supply, the other 3 end of the second capacitor Ca is grounded, the other 5 end of a 4 th resistor Ra is connected with the end of a third capacitor Cb, the other end of the third capacitor Cb, the cathode of the second diode Da and the end of a fourth capacitor Cc are simultaneously connected with the end of an th inductor L1, the other end of the fourth capacitor Cc is connected with the end of the second resistor Rb, and the other end of the second;
in the embodiment, the internal connection mode of the LC oscillation module is that the other end of an -th inductor L1 is simultaneously connected with the end of a 0-0 capacitor C1 and the anode of a freewheeling diode D1, two ends Lp1-1 and Lp1-2 of a transformer primary winding are respectively connected with the end of a filter capacitor C2 and the drain of a MOS tube Q1, two end points A, B between two ends of the transformer primary winding are respectively connected with the other end of a -th capacitor C1 and the cathode of a freewheeling diode D1, and two ends Lp2-1 and Lp2-2 of a second transformer primary winding are respectively connected with the end of a filter capacitor C2 and the drain of a second MOS tube Q2.
In an embodiment, the transformer primary winding is bisected by two endpoints A, B between the two ends of the transformer primary winding.
The working principle of the embodiment is as follows:
firstly, the inductor L1 and the capacitor C1 are connected in series to form an LC oscillating circuit, after a power supply is started, a switching-on current flows through the inductor L1 to store energy, in the process, in order to reduce high-frequency signal interference brought by a power supply alternating current input circuit, the capacitor Ca filters the high-frequency interference signal after the rectifying circuit DP, the diode Da rectifies the high-frequency interference signal after the rectifying circuit DP, the resistor Ra and the capacitor Cb are connected in series to remove a switching-off peak of the rectifying diode, the resistor Rb and the capacitor Cc are connected in series to remove a switching-on peak of the rectifying diode, and the high-frequency filtering circuit consisting of Ca, Da, Ra, Cb, Rb and Cc is used for reducing the influence of the high-frequency signal generated in the power supply input circuit on a subsequent passive power factor correction circuit.
Then, in this example, by using the operating principle of the switching power supply, the inductor L1 charges the capacitor C1 during the conduction period of the MOS transistor Q1, and when the charging is carried out to the conduction voltage of the freewheeling diode D2, the freewheeling diode D2 freewheels through the primary intermediate winding of the transformer T1 while the filter capacitor C2 common to the T1 and the T2 is discharged, and the freewheeling state continues until the MOS transistor Q1 is turned off, and after the MOS transistor Q1 is turned off, the energy in the inductor L1 is charged to the filter capacitor C2 common to the T1 and the T2 through the freewheeling diode D1 and the end Lp1-1 of the primary winding of the transformer T1 during the boosting.
The inductor L1 of the and the capacitor C1 of the are periodically charged and discharged along with the periodic conduction and the turn-off of the MOS tube Q1, and the periodic charging and discharging supplement is carried out through the inductor of the primary winding of the switching transformer T1 while the filter capacitor C2 is periodically charged and discharged through the freewheeling diode D1, particularly during the conduction period of the MOS tube Q1, the discharging of the filter capacitor C2 is additionally carried out through the inductor of the primary winding of the transformer T1, so that the linearity of the energy change of the AC power supply load is increased, the conduction angle of the AC input current of the power supply is enlarged, and the higher harmonic component of the AC input current of the switching power supply is reduced.
It should be noted that, in the embodiment, the LC oscillation module is connected to only the transformer T1:
1. the characteristic that the power difference of two transformer branches in the double flyback switching power supply is large (namely, the power difference value reaches fixed values) is mainly considered, wherein the transformer branch with large power (namely, the transformer branch) plays a main role in forming harmonic current distortion to correct the harmonic current distortion, the power of the other transformer branches (namely, the second transformer branch) is reduced, the formed distortion is mainly disturbance and interference superposed on a waveform after the previous correction, and the correction is not carried out on the distortion.
2. Meanwhile, the circuit is simplified, and the cost is reduced.
The double flyback switching power supply for realizing the passive power factor correction by the single-path LC oscillation only uses groups of passive devices such as inductors, capacitors, diodes and the like, does not contain active devices such as an integrated control IC, a high-power MOS tube and the like, realizes the power factor correction of the double flyback power supply, the passive power factor correction circuit of the -path (namely, T1-path) flyback power supply has stable dynamic work and convenient parameter adjustment, and the -path (namely, T2-path) power factor correction circuit does not contain active devices and has lower cost.
The above description is merely an example and is not intended to limit the present invention, and any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The passive power factor correction circuit for the flyback switching power supply is characterized by comprising a high-frequency filtering module, an LC oscillating module, a transformer, an MOS (metal oxide semiconductor) tube and a filtering capacitor (C2), wherein the LC oscillating module comprises a -th inductor (L1), a -th capacitor (C1) and a freewheeling diode (D1);
the input end of the high-frequency filter module is used for being connected with the output end of a rectifying device of an alternating current power supply, the output end of the high-frequency filter module is connected with a end of a inductor (L1), the other end of an inductor (L1) is simultaneously connected with a end of a capacitor (C1) and the anode of a freewheeling diode (D1), two ends of a primary winding of a transformer are respectively connected with a end of a filter capacitor and the drain electrode of an MOS (MOS) tube, two end points (A, B) between two ends of the primary winding of the transformer are respectively connected with the other end of a capacitor (C1) and the cathode of the freewheeling diode (D1), and the other end of the filter capacitor (C2.
2. The passive power factor correction circuit for a flyback switching power supply of claim 1, wherein two terminals (A, B) between the two ends of the primary winding of the transformer bisect the primary winding of the transformer.
3. The passive power factor correction circuit for the flyback switching power supply according to claim 1 or 2, wherein the high frequency filtering module comprises a resistor (Ra), a second resistor (Rb), a second diode (Da), a second capacitor (Ca), a third capacitor (Cb), and a fourth capacitor (Cc), wherein a end of the resistor (Ra), an anode of the second diode (Da), and a end of the second capacitor (Ca) are simultaneously connected to the output end of the rectifying device of the ac power supply, an alternative end of the second capacitor (Ca) is grounded, an alternative end of the resistor (Ra) is connected to a end of the third capacitor (Cb), an alternative end of the third capacitor (Cb), a cathode of the second diode (Da), and an alternative end of the fourth capacitor (Cc) are simultaneously connected to a end of the inductor (L1), and an alternative end of the second resistor (Rb) of the of the fourth capacitor (Cc) is grounded.
4. The passive power factor correction circuit for the flyback switching power supply of claim 1 or 2, wherein the transformer comprises an th transformer (T1) and a second transformer (T2), and the MOS transistor comprises a th MOS transistor (Q1) and a second MOS transistor (Q2).
5. The passive pfc circuit for a flyback switching power supply of claim 4, wherein if the power of the th transformer (T1) is greater than the power of the second transformer (T2) and the power difference reaches a constant value of , the th transformer (T1) and the second transformer (T2) are connected as follows:
two ends (Lp1-1 and Lp1-2) of a primary winding of an transformer are respectively connected with the end of a filter capacitor (C2) and the drain electrode of a MOS transistor (Q1), two end points (A, B) between two ends of the primary winding of the transformer are respectively connected with the other end of an capacitor (C1) and the negative electrode of a freewheeling diode (D1), and two ends (Lp2-1 and Lp2-2) of a primary winding of a second transformer are respectively connected with the end of the filter capacitor (C2) and the drain electrode of the second MOS transistor (Q2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911031110.3A CN110739843A (en) | 2019-10-28 | 2019-10-28 | Passive power factor correction circuit for flyback switching power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911031110.3A CN110739843A (en) | 2019-10-28 | 2019-10-28 | Passive power factor correction circuit for flyback switching power supply |
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| CN110739843A true CN110739843A (en) | 2020-01-31 |
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| CN201911031110.3A Pending CN110739843A (en) | 2019-10-28 | 2019-10-28 | Passive power factor correction circuit for flyback switching power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113992027A (en) * | 2021-10-26 | 2022-01-28 | 珠海格力电器股份有限公司 | Isolating switch power supply control circuit, method and device and isolating switch power supply |
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| CN202586778U (en) * | 2012-05-14 | 2012-12-05 | 上虞市欧本电子有限公司 | Power source for light-emitting diode (LED) display screen |
| CN106849687A (en) * | 2017-03-15 | 2017-06-13 | 四川长虹电器股份有限公司 | Double flyback sourses of PPFC are realized in two-way LC vibrations |
| CN107070194A (en) * | 2017-03-15 | 2017-08-18 | 四川长虹电器股份有限公司 | Single channel LC vibrates the double flyback sourses for realizing PPFC |
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2019
- 2019-10-28 CN CN201911031110.3A patent/CN110739843A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4193018A (en) * | 1978-09-20 | 1980-03-11 | Rca Corporation | Deflection circuit |
| CN202586778U (en) * | 2012-05-14 | 2012-12-05 | 上虞市欧本电子有限公司 | Power source for light-emitting diode (LED) display screen |
| CN106849687A (en) * | 2017-03-15 | 2017-06-13 | 四川长虹电器股份有限公司 | Double flyback sourses of PPFC are realized in two-way LC vibrations |
| CN107070194A (en) * | 2017-03-15 | 2017-08-18 | 四川长虹电器股份有限公司 | Single channel LC vibrates the double flyback sourses for realizing PPFC |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113992027A (en) * | 2021-10-26 | 2022-01-28 | 珠海格力电器股份有限公司 | Isolating switch power supply control circuit, method and device and isolating switch power supply |
| CN113992027B (en) * | 2021-10-26 | 2023-09-08 | 珠海格力电器股份有限公司 | Isolation switch power supply control circuit, method and device and isolation switch power supply |
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Application publication date: 20200131 |