A burst mode pulse density modulation scheme for inductive power transfer systems without communication modules

Load voltage regulation in wireless inductive power transfer systems can be achieved by load side control. As the regulation capability of a single converter is limited, a front side converter is usually applied to widen the operation range. Load side information is normally required for the dual side cooperation. However, adding communication modules will inevitably increase the system overall size and cost. Moreover, communication modules have poor reliability and uncertain delay, which may cause difficulties in control. To solve this issue, a burst mode pulse density modulation control scheme is proposed in this paper that can perform output regulation without communication modules and have a high efficiency. Simulation and experimental results are provided in this paper to prove the effectiveness of the proposed method.