Zero-Crossing Current Detection for Modular and Robust Dynamic Wireless Power Transfer

A novel control scheme applicable to in-road inductive wireless charging pads in a dynamic system is presented. Primary inverter current sensing allows the primary pad to detect an approaching secondary pad. Zero-crossing detection of the same current allows the primary to synchronize to the secondary, functioning as a "synchronous inverter". Necessary measures to ensure stable operation of the design are discussed. The design is validated through simulation, which demonstrated no loss of efficiency or power capacity with the novel synchronization and detection scheme.