Secondary-side Compensation Circuit for Inductive Power Transfer System

磯貝 昇吾(1811018)


We propose a novel compensation circuit for inductive power transfer (IPT) system which is implemented only at the secondary side. In IPT systems, compensation circuits are implemented to suppress reactive components in the circuit to create large currents, resulting in improved power transfer efficiency and capability. The conventional compensation circuit method requires mounting on both the primary side and the secondary side. In the method using a series resonance capacitor on the primary side, a large current flows transmitting coil when the load is absent. Also, in other schemes, the output depends on the mutual inductance between the transmitting and receiving coils. In the proposed method, the reactive component existing on the transmitter side is also canceled by the proposed receiver-side compensation circuit. And this method can simplify primary side while realizing load-independent constant voltage/current functionality. Furthermore, that output value can be changed independently of the mutual inductance. When expanding the proposed system, it is only necessary to install transmitting coils, so that all the changing conditions can be changed only by modifying the compensation circuit, which is considered to be easy to apply to various applications. In this thesis, we show the design of the secondary-side compensation circuit and confirm its effectiveness by simulation and experiment results.