Abstract
This article proposes a current-fed capacitive power transfer (CPT) system with a basic parallel–series (PS) compensation for step-down constant-voltage output. There are three main contributions. First, a resonant current source inverter is designed at the input side to excite a parallel <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">LC</i> resonant tank, which generates a sinusoidal voltage and achieves zero-voltage switching at both turn- <sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">on</small> and <sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">off</small> transients. Second, a PS CPT compensation is proposed and modeled by the <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">g</i> -parameters of a two-port network, realizing voltage step-down and zero-phase-angle. Third, considering parasitic resistances, the output voltage attenuation and system efficiency are studied at different loads, couplings, and quality factors. A 150 W PS-compensated prototype is implemented with 150 mm × 300 mm metal plates. Experiments validate the voltage step-down property with a voltage gain of 0.4 and a peak dc–dc efficiency of 87.3%.
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