Switching strategy comparison of SP compensated inductive power transfer system

This paper presents a wireless power transmission system which is consisted of a full-bridge converter, two resonance circuits and a diode rectifier to obtain the desired output voltage. The focused topology is based on SP compensation circuit, where S denoted the primary coil is connected in series with the compensation capacitor, and P denoted the secondary coil is connected in parallel with the compensation capacitor. In this research, the phase-shift based pulse width modulation (PWM) control and frequency modulation control are used to contrast the differences between these two methods. Both schemes include voltage loop and current loop control, so as to get the required performances. Finally, a prototype of DC 200V/48V system with 500W rating and 15cm distance between two coils is set to verify the feasibility of the control idea.