| Abstract |
The performance of classical frequency modulated bidirectional CLLLC resonant converter is heavilyaffected by the body diode reverse recovery and junction capacitance of the output rectifier. In thispaper, steady-state analysis and ZVS design methodology for a phase shift modulated ZVS CLLLCresonant converter is presented. In the proposed design, all the power switches are modulated with a fixed switching rate located the below series resonant frequency. A step-by-step design is formulated based on steady-state analysis, which maintains ZVS operation over a wide voltage range, and reduces conduction losses as much as possible. Compared with frequency modulation, phase shift modulation based on the proposed design yields less sensitivity with respect to switch parasitic parameters. Particularly, improved steady-state performance and enhanced efficiency can be achieved when MOSFETs with poor reverse recovery characteristics and/or large junction capacitance are employed. The analysis and proposed design is experimentally verified on a 800W half-bridge prototype. |
