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Extended stroboscopic mapping (ESM) method: A soft-switching operating points determining approach of resonant inverters

This paper proposes an extended stroboscopic mapping (ESM) method for analyzing soft-switching operating points of resonant inverters. The essential idea of the proposed method is treating the operating period of traditional stroboscopic mapping model as a variable and employing fixed-point theory to find the soft-switching operating points. The method consists of four simple and easy-to-implement steps and can accurately determine the periods and steady-state responses of all possible steady-state soft-switching operating points of resonant inverters. A series tuned inductively coupled power transfer (ICPT) system is taken as an example to test the proposed method. Both simulation and experimental results have proved the validation of the proposed ESM method.