A novel resonant current control method for contactless power transfer system

A novel resonant current control method especially the fast sampling method for contactless power transfer system is proposed. Within this method, the amplitude of primary resonant current is obtained by sampling at the maximum of the resonant current only one time during a resonant period, which doesn't need extra peak detecting circuit. The resonant period is well measured, and the delay time is accurately set to ensure the sampling point of ADC at the crest or the trough of the resonant current. The resonant current is controlled by PI controller with phase-shifted control. Simulation and experiment verify the effectiveness of proposed sampling and control method.

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