A Hybrid DC/DC Converter for EV OBCs Using Full-bridge and Resonant Converters with a Single Transformer

Abstract

This paper proposes a dc/dc converter for electric vehicle onboard chargers using a secondary resonant tank. To attain soft switching characteristics, such as zero voltage switching, magnetizing inductance has been used at the primary side of the transformer. The leakage inductance of the transformer is used as a resonant inductor on the secondary side to avoid the use of a separate inductor as resonance. The proposed converter is applicable for a wide load range. A 6.6KW prototype has been implemented for a wide range of load variations (250V, 330V, 360V, and 413V). A maximum efficiency of 97.4% is achieved at 413V.

A Comprehensive Review on Charging Topologies and Power Electronic Converter Solutions for Electric Vehicles

“…Figure 7 shows classifications of various PEC topologies, which are costly with compact size [21], [96], [169]. Several studies present their design and control schemes and check the modeling stability using the Lyapunov-based function [170] - [172]. For improving the power factor with high power qual-ity, several research works study the novel implementation design of the AC-DC converters in terms of operation modes [173], [174], soft-switching technologies and band-gap devices [173]- [183], harmonics [184]- [187], control scheme [188]- [191], and size [192] - [195], supported by a comprehensive comparison [21], [96].…”