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Parallel integrated Buck-Flyback power factor correction (PFC) converter topology

A technology of power factor correction and converter, which is applied in the direction of converting DC power input to DC power output, output power conversion devices, instruments, etc., can solve the problems of affecting the input power factor of the grid side and increasing the input current harmonics, etc., to achieve The effect of low cost, reducing harmonics and improving power factor

Inactive Publication Date: 2014-03-26
SOUTHWEST JIAOTONG UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the Buck topology is applied to the PFC circuit, the input voltage V after the bridge rectifier g less than the output voltage V o In the interval, the input current i in is zero, as in figure 1 and figure 2 As shown, this dead time greatly increases the input current harmonics and affects the grid-side input power factor

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  • Parallel integrated Buck-Flyback power factor correction (PFC) converter topology
  • Parallel integrated Buck-Flyback power factor correction (PFC) converter topology
  • Parallel integrated Buck-Flyback power factor correction (PFC) converter topology

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Embodiment Construction

[0024] Figure 6 As a specific embodiment of the present invention, such as Figure 6 The power factor correction topology and control implementation of voltage-type PWM control are shown, the Buck inductor current is in discontinuous mode, and the Flyback transformer current is in discontinuous mode.

[0025] Figure 7 It is the waveform of the input current, input voltage and output voltage, Buck inductor current, and Flyback transformer primary current when the input voltage is 110Vac and 220Vac and the frequency is 50Hz in Embodiment 1 of the present invention. It can be seen from the figure that the converter is in It can work normally and stably in the full voltage range, realizing the function of power factor correction, and in the range where the input voltage is lower than the output voltage, the input current also follows the input voltage to a certain extent, which is smaller than that of the traditional Buck PFC transformer. harmonic components of the input curre...

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Abstract

The invention discloses a parallel integrated Buck-Flyback power factor correction (PFC) converter. Conventional power factor correction converters are difficult in realizing high power factor, low total harmonic distortion and high efficiency. The parallel integrated Buck-Flyback PFC converter is formed by parallelly connecting input ends of a Buck PFC converter and a Flyback PFC converter, parallelly connecting output ends of the Buck PFC converter and the Flyback PFC converter and integrating main switch tubes, thereby combining the advantages of high efficiency of the Buck PFC converter and high power factor of the Flyback PFC converter. The parallel integrated Buck-Flyback PFC converter is simple in topological structure and control and realizes characteristics of high power factor and low total harmonic distortion, and a high-performance solution is provided for application needing power factor correction.

Description

technical field [0001] The invention relates to power transmission, especially the technical field of power factor correction with low input current harmonics, low voltage output and high efficiency. 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, usin...

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Application Information

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IPC IPC(8): H02M3/335H02M1/42H02M1/12
CPCY02B70/126Y02B70/10Y02P80/10
Inventor 许建平刘雪山王楠高建龙
Owner SOUTHWEST JIAOTONG UNIV