High-Efficiency and Full Range ZVS Single-Stage Semi-DAB AC-DC Converter with Improved Modulation and Variable Frequency Control

Peisong Ma, Deshang Sha*, Debin Zhang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

In this article, an improved modulation and variable frequency control strategy for a single-stage high-frequency isolated semi-dual-active-bridge-based ac-dc converter is proposed, which can achieve full operating range (the entire ac line cycle and full-load range) zero-voltage switching (ZVS) and high efficiency. Compared with the basic variable frequency control, an improved variable frequency strategy can reduce the envelope of leakage inductor peak current and reduce the dependence and sensitivity to the load power. More accurate ZVS criteria in view of the magnetizing inductor Lm are proposed. Seven operating modes are adopted and the transition among them is seamless. Three control variables are used in every mode. Wide voltage conversion gain and high-quality grid-side ac current can be obtained without mandatory current-tracking loops. In addition, detailed comparisons among different control strategies and different mode operating regions are analyzed. The design of the transformer and inductor is not affected at all despite the switching frequency varies. A 250-W experimental prototype was built to verify the effectiveness of the proposed improved variable frequency control strategy.

Original languageEnglish
Pages (from-to)6003-6016
Number of pages14
JournalIEEE Transactions on Power Electronics
Volume39
Issue number5
DOIs
Publication statusPublished - 1 May 2024

Keywords

  • Full operating range zero-voltage-switching (ZVS)
  • improved variable switching frequency control
  • more accurate ZVS criteria
  • new modulations
  • single-stage ac-dc converter

Fingerprint

Dive into the research topics of 'High-Efficiency and Full Range ZVS Single-Stage Semi-DAB AC-DC Converter with Improved Modulation and Variable Frequency Control'. Together they form a unique fingerprint.

Cite this