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This study proposed a hybrid inductive and capacitive wireless power transfer system to achieve high-power transfer by combining inductive power transfer (IPT) and capacitive power transfer (CPT). A traditional IPT system imposes a high voltage on the transmitter because of resonance. Meanwhile, high voltages are required to establish an electric field to deliver power to the CPT system. Therefore, they can be combined to a hybrid system to achieve high-power transfer by utilising two power transfer paths. A general model of the hybrid IPT and CPT coupler is analysed in detail. With a series-series compensation topology, 1.1 kW hybrid system with equal power transferred by two paths is simulated and set up to evaluate the performance of the proposed method. An experimental prototype is built under various conditions, and the result shows that the hybrid system achieved 1.1 kW output power through both of magnetic path and of electric path successfully with 91.9% DC-DC efficiency.

A double-sided capacitor-inductor (CL) compensation topology is proposed for high-power capacitive power transfer (CPT) charging systems with a component voltage stress optimisation to alleviate the voltage stress on passive components and coupling interfaces. First, detailed analysis of the compensation topology characteristic is carried out based on fundamental harmonics approximation analysis method to yield the voltage stress functions against system's parameters. Then, a voltage stress optimisation is presented. Third, system component voltage stress can be reallocated effectively according to the desired requirement by adjusting system parameters accordingly. With the proposed voltage stress optimisation, a CPT prototype is set up to verify the proposed method performance. As per the experiment results, the efficiency of the prototype reaches 87.47% with 1494 W output power from DC to DC at the 1 MHz switching frequency. Besides, the maximum voltage stress is significantly reduced compared to that without optimisation. 2 Double-sided CL compensation for CPT The proposed CPT system consists of a full-bridge inverter, primary and secondary side's resonant tanks, capacitive interfaces and a rectifier as shown in Fig. 1. At the primary side, a full-bridge

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