Three-way forward voltage output single-stage bridgeless cukpfc converter and its control method

A forward voltage and converter technology, which is applied to the three-way forward voltage output single-stage bridgeless CukPFC converter and its control field, can solve the problems of high cost and low efficiency, and achieve high inductance utilization and on-state loss. Low, the effect of solving the reverse recovery problem

Inactive Publication Date: 2019-03-12
FUZHOU UNIV
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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-way forward voltage output single-stage bridgeless cukpfc converter and its control method
  • Three-way forward voltage output single-stage bridgeless cukpfc converter and its control method
  • Three-way forward voltage output single-stage bridgeless cukpfc converter and its control method

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Embodiment Construction

[0025] The technical solution of the present invention will be specifically described below in conjunction with the accompanying 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 an inverting circuit to convert 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 polarities of the MOS transistor and the output diode in the conventional Cuk DC-DC converter are reversed, and then two symmetrically working circuits are combined to obtain a forward voltage output, eliminating the need for a reverse circuit, thereby sav...

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Abstract

The invention relates to a three-way forward voltage output single-stage bridgeless Cuk PFC converter and a control method thereof. Compared with the traditional Cuk PFC converter, this converter completely eliminates the diode rectifier bridge, only uses a single input inductor, has a high utilization rate of the inductor, and can realize reliable three-way forward voltage output, which solves the reverse voltage output of the Cuk topology problem, and there is no cross-effect of each channel. Working in DCM mode, the input current can naturally track the input voltage to achieve unity power factor. It has the 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 power systems has been widely concerned. As a power electronic conversion device that converts alternating current into direct current, the power factor correction converter realizes the adjustment and conversion of voltage while realizing the unit power factor. play a key role in many other fields. Due to the inherent characteristics of the Boost circuit, the traditional Boost PFC can only realize step-up conversion. To obtain a low-voltage output, a cascaded DC-DC converter is required to realize step-down regulat...

Claims

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Application Information

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Patent Type & Authority Patents(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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