A Hysteresis ON-OFF Control Method of Inductive Power Transfer Systems with Low Output Ripples and Fast Transient Responses

This paper proposes a hysteresis ON-OFF control method for inductive power transfer (IPT) systems with low output ripples and fast transient responses. System power is regulated by skipping pulses, thus achieving zero voltage switching over the full operating range. Moreover, each switching state is determined by a hysteresis comparator operating on the measured power. This prevents the skipped pulses from exciting poorly damped oscillations. The dynamic behavior of IPT systems with the hysteresis ON-OFF control method is excellent because the controlled state of the system is directly adjusted in every half cycle. The effectiveness and feasibility of the proposed method are validated by simulations and experimental results from a small-scale laboratory prototype.