A Review of DC-DC Resonant Converter Topologies and Control Techniques for Electric Vehicle Applications

Abstract

Resonant converters are attractive for DC-DC converter applications of electric vehicles (EVs) due to their wide range of soft switching and less output filter requirements compared to dual active bridge (DAB) converters. However, the design and control implementation of resonant converters is comparatively challenging due to the nonlinearities introduced with the resonant tank. LLC and CLLC resonant converters are popular among the resonant converter topologies, while new topologies are being derived based on the basic resonant converter topologies. This paper conducts a review on the basic resonant converter topologies, modes of operation of the resonant converter, modeling and control techniques, and special design considerations for resonant converter design. Existing topologies and control techniques of resonant converters enabling the derivation of new converter topologies and control methodologies, are investigated.

Keywords

• CLLC
• extended describing functions
• frequency modulation
• LLC
• optimal trajectory control
• resonant converter