Design of a Zero-Voltage-Switching Large Air Gap Wireless Charger for Plug-in HEVs

From 2012 Automotive Simulation World Congress: Most wireless chargers today are based on the resonance between two coils with a high air gap. The critical issue is designing the coils with appropriate self-inductance and mutual inductance. Advanced Power Electronics Lab (APEL) designed a 1 kW wireless charging system with an air gap of 15 cm to 50 cm. The team used ANSYS Maxwell to extract the coil parameters. A soft-switching technique increases system efficiency; an extra LC network compensates for the reactive power in the system caused by low mutual inductance, which gives the system low current stress.
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