Analysis of a ZVDS Class-DE Current-Driven Full-Bridge Rectifier to Compensation Network Capacitance Design for WPT System

The accurate, systematic, and effective design method of compensation network capacitance based on the series-series resonant topology is presented for reducing reactive power of wireless power transfer system. The design procedure uses a principle of the current-driven Class-DE full-bridge zero-voltage and zero-derivative-switching rectifier, a Class-D full-bridge zero-voltage-switching inverter, and a loosely coupling transformer. The key parameters of the Class-DE current-driven full-bridge zero-voltage and zero-derivative-switching rectifier as a function of diode duty ratio are derived from the time-domain analysis with Fourier series, such as the normalized input impedance and relationship of input current and output voltage. Moreover, the presented topology has a soft-switching conditions that low-switching losses as well as low-switching noise. The presented design is verified by experiments, the maximum transfer power and system efficiency at a transfer distance of 50 mm are 1.8 kW and 93.38%, respectively.