A Single-Switch Self-Driving High Frequency Converter Based on Optimal Feedback Network

With the fast development of power electronic conversion, high frequency converters have become a research hotspot. This paper proposes a self-driving method for a single-switch high frequency converter. The self-driving circuit is based on a voltage feedback network, which helps to realize an almost 180 degree phase difference between the switch gate voltage and drain voltage. The basic feedback network is analyzed and the gate-to-drain voltage transfer function is derived. However, the operating frequency is limited. To widen the operating frequency, optimal feedback networks with parallel branch have been proposed and analyzed. A 13MHz prototype has been built to verify the feasibility of the proposed optimal feedback network and self-driving method.