High-Power High-Voltage Series Resonant Converter with Discontinuous Current Mode

According to the Chap. 1, the LC series resonant converter is conducive to achieving zero-current switching (ZCS) for IGBTs. Consequently, the high-power high-voltage series resonant converter (SRC) with capacitive output filter in discontinuous current mode (DCM) is also a feasible MV dc/dc converter, which has been applied in various practical scenarios [1–8]. The high-frequency transformer serves as the core component for high-power DCM-SRC, and to ensure reliable operation, it is crucial to avoid magnetic core saturation of the high-power high-frequency transformer during the whole output voltage range. Thus, meticulous magnetic flux density (MFD) analysis and effective MFD control of DCM-SRC across wide output voltage range are indispensable. This chapter will delve into the MFD changes under fixed pulse frequency modulation control and present an asymmetric fixed pulse frequency modulation (APFM) strategy with its associated MFD control effect. Simulations and experimental validations are also provided to validate the theoretical analysis.