Design Guidelines for a Capacitive Wireless Power Transfer System with Input/Output Matching Transformers

Abstract

-A capacitive wireless power transfer (C-WPT) system uses an electric field to transmit power through a physical isolation barrier which forms a pair of ac link capacitors between the metal plates. However, the physical dimension and low dielectric constant of the interface medium severely limit the effective link capacitance to a level comparable to the main switch output capacitance of the transmitting circuit, which thus narrows the soft-switching range in the light load condition. Moreover, by fundamental limit analysis, it can be proved that such a low link capacitance increases operating frequency and capacitor voltage stress in the full load condition. In order to handle these problems, this paper investigates optimal design of double matching transformer networks for C-WPT. Using mathematical analysis with fundamental harmonic approximation, a design guideline is presented to avoid unnecessarily high frequency operation, to suppress the voltage stress on the link capacitors, and to achieve wide ZVS range even with low link capacitance. Simulation and hardware implementation are performed on a 5-W prototype system equipped with a 256-pF link capacitance and a 200-pF switch output capacitance. Results show that the proposed scheme ensures zero-voltage-switching from full load to 10% load, and the switching frequency and the link capacitor voltage stress are kept below 250 kHz and 452 V, respectively, in the full load condition.

A Review of the Current State of Technology of Capacitive Wireless Power Transfer

“…A modified LLC topology utilizes a shunt inductor on the secondary side to be able to operate outside resonance conditions, increasing the versatility of the CPT system [67,76,79]. In addition, transformers on the primary and/or secondary side can realize the required voltage change and serve as impedance transformation [80][81][82].…”

Single-Stage Duty-Controlled Half-Bridge Inverter for Compact Capacitive Power Transfer System

“…1) The Resonant Components, Lr and C link The total link capacitance, C link , is measured from the capacitive coupler structure. From the fundamental design equation of CPT given in [23], the resonant angular frequency, ω o , is chosen as larger than the following value…”

LC–CLC compensation topology for capacitive power transfer system to improve misalignment performance

“…Therefore, high voltages between metal plates are required to build the strong electric field to achieve high power transfer. To increase the plate voltage, a double-sided matching transformer is used to suppress the voltage stress to realise power transfer [20]. However, high power and efficiency transformers at a high frequency usually up to megahertz are costly and challenging for CPT system.…”