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Improved SWISS rectifier based on phase-shifted full-bridge soft switching

A phase-shifting full-bridge and soft-switching technology, which is applied to instruments, output power conversion devices, and conversion of AC power input to DC power output, can solve problems affecting system power factor and excessive switch stress, and reduce harmonics Wave pollution, low switching loss, and high efficiency

Pending Publication Date: 2020-01-17
HARBIN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hard switching operation and excessive switching stress are two common problems in current rectifiers, which seriously affect the system power factor

Method used

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  • Improved SWISS rectifier based on phase-shifted full-bridge soft switching
  • Improved SWISS rectifier based on phase-shifted full-bridge soft switching
  • Improved SWISS rectifier based on phase-shifted full-bridge soft switching

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Embodiment Construction

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. It should be noted that the embodiments described here are only some of the embodiments of the present invention, not the present invention. All implementations, the embodiments are only exemplary.

[0031] refer to figure 1 , an improved SWISS rectifier based on phase-shifted full-bridge soft switching, including a rectifier bridge E composed of 6 diodes, an input filter circuit F, a harmonic injection circuit G composed of 6 diodes and 6 IGBTs, and 2 shifted The upper and lower parallel DC-DC converters composed of phase full bridge circuit are characterized in that the basic circuit is a three-phase Buck type PFC rectifier circuit. Wherein the filter circuit F is an RLC type filter circuit, and its capacitor common terminal is grounded; the rectifier bridge E and ...

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Abstract

The invention provides an improved SWISS rectifier based on phase-shifted full-bridge soft switching. The rectifier comprises a three-phase power supply which is connected to an a phase, a b phase anda c phase separately and then is connected to one end of an input filter circuit F for filtering, and the other end of the input filter circuit F is connected with a rectifier bridge E formed by sixdiodes. The middle point of each phase of bridge arm of the rectifier bridge E is connected with a harmonic injection circuit G composed of six diodes and six IGBTs, and the two ends of the rectifierbridge E are connected with an up-down parallel DC-DC converter composed of two phase-shifting full-bridge circuits. Compared with a traditional three-phase rectifier, the improved phase-shifted full-bridge rectifier enables the conversion efficiency of the circuit to be improved, is low in input current harmonic rate, stable in output voltage and few in harmonic waves, and has the very high voltage regulation rate and load regulation rate.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to an improved SWISS rectifier based on a phase-shifted full-bridge soft switch. Background technique [0002] As global energy and environmental issues become increasingly prominent, the pure electric vehicle industry develops rapidly, and high-power DC fast charging technology develops. For the wide application of low-voltage and high-current loads such as data center server power supply and electroplating power supply, it is of great practical value to study three-phase power factor correction technology with step-down output characteristics. [0003] In the process of taking power from the AC power grid and performing power conversion, it generally needs to go through an AC to DC conversion (AC-DC) process. Among them, uncontrolled rectification and phase-controlled rectification will generate a large amount of harmonic current. With the wide application of power electronic de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02M1/12H02M7/219H02M1/42
CPCH02M1/126H02M1/4233H02M3/33523H02M3/33569H02M7/219H02M1/0048H02M1/0058Y02B70/10
Inventor 颜景斌刘明亮李航天
Owner HARBIN UNIV OF SCI & TECH
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