A modulation scheme with full range ZVS and natural power factor correction for bridgeless single-stage isolated AC–DC converter

Yun Zhang, Gen Yang, Jing Li, Zhiguo Kong, Xinshan Zhu

Research output: Journal PublicationArticlepeer-review

Abstract

The ac side structure of a bridgeless single-stage isolated ac–dc converter reduces the number of components by sharing power switches between the bridgeless rectifier and the dual-active-bridge (DAB) dc–dc converter. However, it also makes it more difficult to achieve zero-voltage switching (ZVS) for the ac side switches. Therefore, a modulation scheme is proposed to achieve ZVS for all switches over the full ranges of the grid voltage and load. A quasi-fixed switching frequency control method is also applied, in which the switching frequency is constant during a half-cycle of the grid voltage. By adjusting the switching frequency, the grid side inductor can operate in critical conduction mode without a zero-current-detection circuit, which facilitates the ZVS realization of the ac side switches. In addition, a natural power factor correction can be realized without the grid-side current sensors. Finally, a 500 W prototype was built to validate the theoretical analysis and the effectiveness of the proposed modulation scheme.
Original languageEnglish
Article number22113715
Pages (from-to)195-205
JournalIEEE Transactions on Power Electronics
Volume38
Issue number1
DOIs
Publication statusPublished - Jan 2023

Keywords

  • AC–DC converter
  • dual active bridge (DAB)
  • power factor correction (PFC)
  • zero-voltage switching (ZVS)

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