Maximum Output Power Design for an 85kHz Class-D ZVS Inverter with 650V/30A SiC-MOSFETs at Any Duty Ratio and DC Input Voltage

This paper proposes a design procedure for an 85kHz class-D zero-voltage-switching (ZVS) inverter to achieve the maximum output power. The output power of the class-D inverter is limited by its two switches topology. To maximize the output power, the class-D inverter needs to achieve low switching loss and high output power simultaneously. However, it is challenging to design the related parameters to satisfy the condition. In this paper, the output power characteristic under the ZVS condition is analyzed. The condition for achieving high output power is inferred to be 0
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output current phase angle (class-DE mode), large duty, and high DC input voltage. To verify the analysis, a class-D inverter with 650V/30A SiC-MOSFET is designed with four different specifications. The result waveforms satisfied the ZVS condition and the obtained output powers satisfied the analyzed characteristics.