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Single-stage bidirectional isolation AC-DC converter

A two-way isolation and converter technology, which is applied in the direction of converting AC power input to DC power output, output power conversion devices, electrical components, etc. power density and other issues

Inactive Publication Date: 2014-09-03
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The power of the single-phase AC power supply needs to be transformed twice before it reaches the output port. The power loss is large, and the volume of the converter is also large, which is not conducive to the realization of high efficiency and high power density of the converter.

Method used

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Embodiment Construction

[0035] The present invention will be further described below in conjunction with accompanying drawing.

[0036] Aiming at V2G and grid-battery energy storage system, the invention discloses three kinds of single-stage bidirectional isolation AC-DC converters. The structures of the three converters are all composed of a single-phase AC source, a DC source, Boost inductors, phase-shift inductors, bus capacitors, transformers, primary and secondary side power switch tubes, and the like. By connecting the Boost inductor at the midpoint of the bridge arm, the integration of the bidirectional Boost PFC converter and the bridge bidirectional converter can be realized. The single-stage power conversion can realize the two functions of PFC+isolated DC-DC conversion, and the energy can flow in both directions. Not only the power switch tubes on the primary side are shared, but all power switch tubes can realize ZVS soft switching, and the conversion efficiency is high.

[0037] as atta...

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Abstract

The invention discloses a single-stage bidirectional isolation AC-DC converter, and belongs to the field of an electronic power electronic converter. The structures of three converters are each composed of single-phase AC sources, DC sources, Boost inductors, phase shift inductors, bus capacitors, transformers, primary power switch tubes, secondary power switch tubes and the like. The Boost inductors are connected to leg midpoints such that the integration of a bidirectional Boost PFC converter with a bridge type bidirectional converter is realized, through single-stage power transformation, two functions of PFC and isolation DC-DC transformation can be realized, and bidirectional flowing of energy is realized. The single-stage bidirectional isolation AC-DC converter, has the advantages of small power loss, high transformation efficiency, small switching loss, capability of realizing the bidirectional flowing of the energy, and the like, thereby being especially suitable for V2G and power network-storage battery energy storage systems.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to an AC-DC converter suitable for systems such as V2G and grid-battery energy storage. Background technique [0002] In order to cope with the severe challenges posed by resource shortage and environmental pollution to the development of power systems, smart grid technology has received extensive attention from power industries in various countries. At the same time, as a green vehicle, electric vehicles have become an inevitable trend in the development of the automobile industry. In general, large-scale electric vehicles connected to the power grid bring challenges to the power system in terms of load growth and system stability on the one hand; On the one hand, it brings new opportunities to the power system. In addition to having load characteristics, electric vehicles can be used as distributed energy storage devices to provide services for the power system, thereby improvin...

Claims

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Application Information

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IPC IPC(8): H02M7/797
Inventor 孙孝峰申彦峰李昕
Owner YANSHAN UNIV
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