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Digital self-tuning controller for ZCS resonant converters operating in the 10MHz-range

In this study, a controller for switched-resonator converters operating in the 10MHz range is presented with self-tuning capabilities. The control scheme provides a fast and accurate two-stage lock-in procedure to ensure zero-current switching at high frequencies, maintaining low control workload. The various modules of the controller are detailed, including the self-tuner based on a digital delay-locked loop, and a Rogowski-type on-board zero-current detector. Simulation and experiments were conducted to verify the design of the controller using a gyrator resonant switched-capacitor converter as the switched-resonator power stage.