Abstract
A direct single-phase ac-ac matrix converter with self-tuning capability and soft-switching operations for bidirectional inductive power transfer (IPT) systems is introduced. The self-tuning capability of the converter makes it suitable for inductive electric vehicle charging applications where the system has variable operating conditions. The soft-switching operations of the converter significantly improve the efficiency and reduce the switching stress which in turn reduces the complexity of the switching commutation. Also, due to the elimination of DC conversion stage and short life electrolytic capacitors, it is expected to be more reliable and durable. A discrete-time sliding mode control (SMC) is proposed to regulate the power transfer level and its direction in the IPT system. Theoretical analysis and design methodology of the proposed SMC are presented in detail. The simulation analysis on a case study IPT system is carried out and the results show that the proposed converter with its SMC can fully regulate the output resonant current around a user-defined reference value. The proposed converter is specifically suitable for grid-to-vehicle (G2V) and vehicle-to-grid (V2G) connections through inductive electric vehicle (EV) charging systems in residential sectors.
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