Analysis, design and control of a double-input contactless resonant converter

A novel double-input contactless resonant converter (DICRC) for the grid & renewable energy wireless power transmission (WPT) system is proposed in this paper. Considering the power-flow requirement, fundamental components in phase modulation is adopted for DICRC. By defining switching functions, the characteristics analysis of the converter is performed along with the unified expressions. In particular, DC input equivalent resistance R_in is defined to depict input power. Since R_in is sensitive to operation frequency f_s for contactless resonant converter, f_s is introduced into the control system, a hybrid regulator is designed according to the analysis and a novel double-hybrid power management strategy is proposed. Experimental results on 1.8 kW prototype are presented to evaluate theoretical analysis and the effectiveness of the control strategy.