Three-path forward voltage output single-stage bridgeless CukPFC converter and control method thereof

A forward voltage and converter technology, applied in the field of three forward voltage output single-stage bridgeless CukPFC converters and their control, can solve the problems of low efficiency and high cost, and achieve low on-state loss and high utilization of inductance , to achieve the effect of unity power factor

Inactive Publication Date: 2017-02-08
FUZHOU UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

At the same time, in various electronic instruments and industrial control equipment, multi-voltage level output is often required. The traditional method is to cascade the two-stage conversion of multiple DC-DC converters in the front-stage PFC converter. This method has low efficiency and high cost.
The research on realizing multiple outputs directly from a single PFC stage is still rare. Therefore, it is of great significance to study a single-stage bridgeless power factor correction converter with high efficiency, high power factor, and multiple outputs.

Method used

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  • Three-path forward voltage output single-stage bridgeless CukPFC converter and control method thereof
  • Three-path forward voltage output single-stage bridgeless CukPFC converter and control method thereof
  • Three-path forward voltage output single-stage bridgeless CukPFC converter and control method thereof

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Embodiment Construction

[0025] The technical solution of the present invention will be described in detail below in conjunction with the drawings.

[0026] The output voltage of the traditional Cuk DC-DC converter is negative. If two symmetrically working Cuk DC-DC converters are combined into a single-stage PFC circuit, the output voltage is also negative. This requires a reverse circuit The feedback control loop can only be connected after the output voltage is reversed, which increases the complexity of the circuit. The specific structure is as follows figure 1 Shown.

[0027] The present invention provides a three-way forward voltage output single-stage bridgeless Cuk PFC converter, such as figure 2 As shown, the polarity of the MOS tube and the output diode in the conventional Cuk DC-DC converter are reversed, and then the two symmetrical working circuits are combined to achieve forward voltage output, eliminating the need for reverse circuits, thereby saving The cost of the circuit. At the same ti...

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Abstract

The invention relate to a three-path forward voltage output single-stage bridgeless Cuk PFC converter and a control method thereof. Compared with a traditional Cuk PFC converter, the three-path forward voltage output single-stage bridgeless CukPFC converter can completely eliminate a diode rectifier bridge, only adopts a single input inductor, has a high inductance utilization rate, can realize reliable three-path forward voltage output, solves a problem of reverse voltage output of Cuk topology and does not has cross influence between paths. The three-path forward voltage output single-stage bridgeless Cuk PFC converter works under a DCM mode, enables input current to naturally follow input voltage, realizes a unit power factor, and has characteristics of high efficiency, high power density and high reliability.

Description

Technical field [0001] The invention relates to a three-way forward voltage output single-stage bridgeless Cuk PFC converter and a control method thereof, which are suitable for low-voltage and low-power occasions and belong to the technical field of power electronic converters. Background technique [0002] With the development of power electronic technology, a large number of power electronic products have been applied, and the problem of harmonic pollution in the power system has received widespread attention. Power factor correction converter, as a power electronic conversion device that converts alternating current to direct current, realizes unit power factor while realizing voltage regulation and conversion. It is used in uninterruptible power supply systems, electronic instruments, various industrial control equipment, and LED lighting. Many other fields play a key role. The traditional Boost PFC can only achieve boost conversion due to the inherent characteristics of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/07H02M1/42
CPCH02M1/42H02M3/07H02M1/0058H02M1/009Y02B70/10
Inventor 王武林贤麟阮慧珊林琼斌蔡逢煌柴琴琴
Owner FUZHOU UNIV
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