A step-down non-isolated three-phase PFC converter and its control method

A converter-controlled, non-isolated technology, applied in high-efficiency power electronic conversion, output power conversion devices, climate sustainability, etc., to achieve the effect of reducing switching losses, simple structure, and reducing the number of switching operations

Active Publication Date: 2021-02-19
LEIHUA ELECTRONICS TECH RES INST AVIATION IND OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a step-down non-isolated three-phase PFC converter and its control method, to solve at least one problem existing in the existing step-up PFC circuit

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  • A step-down non-isolated three-phase PFC converter and its control method
  • A step-down non-isolated three-phase PFC converter and its control method

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Embodiment Construction

[0031] In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below in conjunction with the drawings in the embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of the invention. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention. Embodiments of the present invention will be described in detail below ...

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Abstract

The invention relates to the field of three-phase AC-DC conversion, in particular to a step-down non-isolated three-phase PFC converter and a control method thereof. The step-down non-isolated three-phase PFC converter includes a forward switching unit, a half-controlled rectifier unit and an energy storage freewheeling unit. On the three phase lines of the three-wire power supply; the semi-controlled rectifier unit includes an upper bridge arm and a lower bridge arm, the upper bridge arm is composed of three diodes, and the lower bridge arm is composed of three negative power switch tubes and three diodes connected in series . The step-down non-isolated three-phase PFC converter of the present invention overcomes the defects of the traditional step-up PFC circuit, so that the DC converter of the subsequent stage is not limited by the performance of power devices, can reduce switching losses, and saves There are many power devices, and the circuit structure is simple, the control method is simple and novel, and the efficiency is high. It is suitable for occasions requiring high efficiency and high power density, and has obvious advantages.

Description

technical field [0001] The invention relates to the field of three-phase AC-DC conversion, in particular to a step-down non-isolated three-phase PFC converter and a control method thereof. Background technique [0002] In recent years, the capacity of single equipment loads has become larger and larger, most of which use three-phase power supply, such as electric vehicle charging stations, etc. If there is no power factor correction device, the power quality of the grid will be greatly damaged, and even serious It will lead to the paralysis of the grid. [0003] For a long time, the power factor correction (PFC) circuit for three-phase AC input is usually based on the boost type. Due to the use of boost topology, when the input three-phase voltage is 380VAC, the output is generally high, which can reach about 720V. Even at 800V, the conventional power tube with better performance is below 650V. In recent years, new switching devices such as SiC with a slightly higher voltag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/42H02M1/12
CPCH02M1/12H02M1/4216H02M1/4233H02M1/0054Y02B70/10
Inventor 许政戴钱坤孙百军
Owner LEIHUA ELECTRONICS TECH RES INST AVIATION IND OF CHINA
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