Dead-Band Optimization for ZVS in Inductive Power Transfer System

The realization of zero-voltage switching (ZVS) of inverter can reduce the circuit switching loss. It meets the high power density requirements of the inductive power transfer (IPT). To achieve ZVS, it is necessary to consider the matching of impedance properties to dead-band. Therefore, based on the input equivalent impedance and dead-band, the conditions for achieving ZVS are studied in this paper. Firstly, the equivalent input impedance model is established based on secondary-side full compensation and the switching process is analyzed in the case of ZVS. Secondly, based on the above model, the dead-band range of ZVS is derived. Then, the influence of the primary-side compensation capacitor on the ZVS is discussed, which provides a theoretical basis for fine-tuning the compensation capacitor. Finally, the feasibility of the method is verified by simulation.