Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Soft-switch three-phase PWM rectifier with auxiliary free-wheel channel

A technology of soft switching and rectifiers, applied in the field of rectifiers, can solve the problems of large switching losses of devices, limit operating frequency, and reduce circuit efficiency, and achieve the effects of increasing power density, increasing operating frequency, and improving circuit efficiency

Inactive Publication Date: 2012-07-18
ZHEJIANG UNIV
View PDF4 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of three-phase rectifier can realize input current power factor correction, but the circuit works in a hard switching state, there is a problem of reverse recovery of the diode, and the switching loss of the device is large, which limits the improvement of the operating frequency, reduces the circuit efficiency and has a large electromagnetic interference

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Soft-switch three-phase PWM rectifier with auxiliary free-wheel channel
  • Soft-switch three-phase PWM rectifier with auxiliary free-wheel channel
  • Soft-switch three-phase PWM rectifier with auxiliary free-wheel channel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0026] figure 2 Shown is the circuit diagram of a soft-switching three-phase PWM rectifier scheme 1 with an additional freewheeling path, consisting of six fully controlled main switches S with antiparallel diodes 1 , S 2 , S 3 , S 4 , S 5 and S 6 The three-phase bridge arms formed are respectively connected to the output filter inductance L between the midpoint of each phase bridge arm and the AC grid a , L b and L c And the output capacitor C connected to the output terminal of the three-phase bridge arm o , a fully controlled switch S with anti-parallel diodes is connected in parallel at both ends of the three-phase bridge arm 8 , full control switch S 8 Parallel capacitance C 8 , the six main switches S of the three-phase bridge arm 1 , S 2 , S 3 , S 4 , S 5 and S 6 Parallel capacitor C 1 、C 2 、C 3 、C 4 、C 5 and C 6 , the DC bus of the three-phase bridge arm and the output capacitor C o Auxiliary switch S with anti-parallel diode connected between ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a soft-switch three-phase PWM (Pulse Width Modulation) rectifier with an auxiliary free-wheel channel. The soft-switch three-phase PWM rectifier comprises a three-phase bridge arm consisting of 6 total-control main switches respectively provided with antiparallel diodes and parallel capacitors, input filtering inductors connected between the middle points of each phase of bridge arm and an AC power grid, and an output capacitor connected to the output terminal of the three-phase bridge arm, wherein the total-control switches with both the antiparallel diodes and the parallel capacitors are connected or not connected to two ends of the three-phase bridge arm; an auxiliary switch with both antiparallel diodes and parallel capacitors is connected between a DC bus and the output capacitor of the three-phase bridge arm; and resonance branch circuits consisting of both resonance inductors and clamping capacitors are connected to two ends of the auxiliary switch in a bridging manner. The soft-switch three-phase PWM rectifier has a simple structure, and can inhibit reverse restoration of diodes and reduce electromagnetic interference. All switch devices of the rectifier achieve zero-voltage switch-on, have small loss and high circuit efficiency, facilitate improving the operating frequency and further improve the power density. The rectifier provided by the invention realizes output capacity and voltage control and achieves the power factor correction function of input current.

Description

technical field [0001] The invention relates to a rectifier, especially a soft-switching three-phase PWM rectifier with additional freewheeling path. Background technique [0002] Current three-phase PWM rectifiers such as figure 1 As shown, it consists of six fully controlled main switches S with anti-parallel diodes 1 ~S 6 The three-phase bridge arms formed are respectively connected to the output filter inductance L between the midpoint of each phase bridge arm and the AC grid a ~ L c And the output capacitor C connected to the output terminal of the three-phase bridge arm o . This kind of three-phase rectifier can realize input current power factor correction, but the circuit works in a hard switching state, there is a problem of reverse recovery of the diode, and the switching loss of the device is large, which limits the improvement of the operating frequency, reduces the circuit efficiency and has a large electromagnetic interference. Contents of the invention...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/219H02M1/44
CPCY02B70/1491Y02B70/10
Inventor 徐德鸿马智远李睿
Owner ZHEJIANG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com