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Wide-load-range low-voltage flyback power factor correction converter control method and device for realizing method

A technology of power factor correction and low voltage, which is applied in the field of flyback power factor correction converter control method and its device, can solve the problem of poor power factor and total harmonic distortion, failure to obtain unit power factor, and increased conduction loss of switching tubes. Large and other problems, to achieve the effect of reducing the cost of the converter, reducing the total harmonic distortion, and reducing the voltage stress

Inactive Publication Date: 2013-02-27
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The discontinuous mode flyback power factor corrector can obtain unity power factor, but its peak current is very large, which increases the conduction loss of the switch tube and affects the efficiency of the converter; the critical continuous mode flyback power factor corrector, its conduction The time is fixed in a power frequency cycle. Although the efficiency is higher than that of the discontinuous mode flyback power factor corrector, it cannot obtain unit power factor, and the power factor and total harmonic distortion are better than the discontinuous mode flyback power factor corrector. Difference

Method used

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  • Wide-load-range low-voltage flyback power factor correction converter control method and device for realizing method
  • Wide-load-range low-voltage flyback power factor correction converter control method and device for realizing method

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Embodiment 1

[0019] figure 1 It is a structural block diagram of Embodiment 1 of the present invention.

[0020] A specific embodiment of the present invention is a topology and control method of a low-voltage stress flyback power factor correction converter with a wide load range, and its specific method is:

[0021] In the traditional flyback power factor correction converter switch tube Q 1 A switching tube Q is connected in series with the 2 terminals of the primary winding of the flyback transformer T 2 , switch Q 1 with switch Q 2 Connect the power diode D between 6 anode of the power diode D 6 The cathode of the flyback transformer T is connected to terminal 1 of the primary winding.

[0022] by R 1 and R 2 Composed of output voltage samples for converter output voltage v o (t) Input the negative terminal of the operational amplifier after sampling, and the positive terminal of the operational amplifier inputs the reference voltage signal V ref , after the compensation net...

Embodiment 2

[0030] Image 6 It shows that the difference between this example and the first example is that the power factor correction converter of the switching power supply is a forward converter. The control mode and working process are similar to the first embodiment. It can also be proved by simulation results that it can realize the object of the present invention.

[0031] The method of the present invention can be used not only for the switching power supply composed of the flyback power factor correction converter in the above embodiments, but also for the power factor switching power supply composed of the forward power factor correction converter and other isolated power factor correction converter circuits.

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Abstract

The invention discloses a wide-load-range low-voltage flyback power factor correction converter control method and a device for realizing the method. A switching tube Q2 is serially connected between the switching tube Q1 of the traditional flyback power factor correction converter and the 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. The cathode of the power diode D6 is connected with the 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 widened. On the premise of the same main circuit parameters, the loading range of the traditional flyback power factor correction converter can be improved and the voltage stress born by the switching tube which is connected with the primary winding of the transformer is reduced. The wide-load-range low-voltage flyback power factor correction converter has the advantages that the efficiency is high and unit power factors can be obtained within the entire input voltage range.

Description

technical field [0001] The invention relates to power control equipment, in particular to a low voltage stress flyback power factor correction converter control method and device thereof. Background technique [0002] In recent years, power electronics technology has developed rapidly, and power supply technology, which is an important part of the power electronics field, has gradually become a hot spot in application and research. Switching power supply has established its mainstream position in the field of power supply because of its high efficiency and high power density, but there is a fatal weakness when it is connected to the power grid through a rectifier: the power factor is low (generally only 0.45 to 0.75), Moreover, a large number of current harmonics and reactive power will be generated in the grid to pollute the grid. There are two main methods for suppressing harmonics generated by switching power supplies: one is the passive method, that is, using passive fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02M1/42
CPCY02B70/126Y02B70/10
Inventor 许建平张斐阎铁生杨平周国华
Owner SOUTHWEST JIAOTONG UNIV
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