Cooperative Transmission in Three-Coil Inductive Power Transfer System with Load-Independent Output Voltages

Abstract

This paper presents cooperative transmission of relay coil in three-coil inductive power transfer systems. In the proposed system, relay coil not only supports primary coil to enhance power transmission distance to secondary one but also plays a role of a receiver providing load-independent output voltage. Compensation schemes of series, capacitor-inductor-capacitor and series are applied for primary, relay and secondary coils to keep output voltages provided by secondary coil as well as by relay coil constant against load resistances. Theoretical analysis is followed by simulations to verify effectiveness of the proposed system.