Virginia Polytechnic Institute and State University
Disclosure: Disclosure information not submitted.
The secondary side devices critically affect both normal operation and deadtime operation of LLC converter. The effect of diode Cj and Qrr on ZVS condition during deadtime has been discussed in the literature, but their effect on the waveform during normal operation has not. In this paper, a detailed description of deadtime operation with Si and SiC diodes are provided. An accurate model for their effect on the following normal operation is derived and an improved ZVS condition for fs > fr region is presented. For verification, a 694 kHz/100 W GaN based LLC converter prototype is built and tested.