Analysis and Design of a Dual-Frequency Capacitive Power Transfer System to Reduce Coupler Voltage Stress

In a capacitive power transfer (CPT) system, the coupling capacitance formed between plates is very small only in pF or nF range, which leads to high voltage stress among during energy transmission, increases risk of an electrical breakdown coupled plates. To solve this problem, novel dual-frequency CPT system proposed paper, uses “peak clipping” effect caused by superposition fundamental wave and third harmonic reduce Through detailed analysis working principle it shown that can indeed plate 84.3% equivalent single-frequency also inverter conduction losses 90%. A 200 W prototype designed with scheme, experimental results confirm correctness theoretical derivation.