| Summary: | This paper presents a capacitive power transfer (CPT) system for low power applications. This CPT system utilized π impedance matching to provide reactive compensation and voltage gain, and is driven by a Class-E resonant inverter. In this work, two basic π matching network topologies that can be integrated into the Class-E resonant inverter was analysed. By utilising the proposed method, the zero voltage switching (ZVS) condition can still be achieved even if the load is larger than that optimum and hence yielding high efficiency. Simulation comparison between the two matching networks was performed to determine their performances and later, to select the best matching network that can be integrated into the proposed CPT system prior to practical implementation. The validity of the proposed concept was verified experimentally. A 10 W CPT system lab scale prototype was designed and implemented to demonstrate efficient wireless power transfer across 0.25 mm gap. The experimental work showed that 10 W output power was transferred successfully to the 50 Ω load with only 913 pF capacitive coupling plates at 91.9% efficiency. © 2020, Springer Nature Singapore Pte Ltd.
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