Fundamentals and Design Proposal for Capacitive Contactless Power Transfer Systems

In this paper, a design approach for capacitive power transfer (CPT) systems is described. Electrical energy is transferred contactlessly by using two capacitors connected in series to a load resistance. The transmission path is modeled as a two-port network, giving its properties by matrix parameters. To enhance the system's efficiency, a reactive power compensation with inductances is introduced, along with calculations for a system with parallel compensation on both sides. To validate the analytical results, a circuit simulation is presented as well. Based on these theoretical results, a design proposal for CPT-systems is given.