Abstract
A direct soft-switched single-phase ac–ac matrix converter (MC) for bidirectional inductive power transfer (IPT) systems is proposed. Quantum energy injection/regeneration principle is used to design a simplified digital power controller that enables the converter to establish bidirectional power transfer between the IPT system and single-phase ac mains at a desired power level. The simplified controller can be implemented using basic logic circuit components, without the need for digital signal processor/field programmable gate array platforms, thereby reducing the complexity and the implementation cost. The converter benefits from resonance frequency tracking capability for the synchronization of switching operations of the converter with the resonant current, which makes it ideal for dynamic IPT systems. Also, it benefits from soft-switching operations to achieve an enhanced efficiency and low electromagnetic interference. The converter is specifically suitable for establishing grid-to-vehicle and vehicle-to-grid connections through inductive electric vehicle charging/discharging systems. The proposed converter is analyzed theoretically, is simulated in MATLAB/Simulink, and finally is verified experimentally at low power on a case study IPT system. The results show that the proposed MC can effectively establish bidirectional power transfer at different power levels with soft-switching operation and resonance frequency tracking capability.
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