High-Efficiency Self-Driven Circuit with Parallel Branch for High Frequency Converters

With the development of high frequency converters, driving circuits have gained more and more attention. Self-driven methods can effectively simplify system design and reduce components' number. A basic self-driven circuit can be achieved by adding a series resonant inductor at the switch gate; however the losses of driving circuit are high. To reduce the corresponding losses, a high efficiency self-driven network with an additional parallel branch is proposed, which can significantly improve the system efficiency. A 13 MHz prototype is built to verify the feasibility of the proposed self-driven circuit. The system efficiency can be improved from 80% to 83.9%.