High frequency two-plate capacitive wireless power transfer system
2018
Kroics, K., Riga Technical Univ. (Latvia) | Voitkans, J., Riga Technical Univ. (Latvia)
The paper discusses the capacitive wireless power transfer (WPT) system for small portable device charging. The capacitive WPT can replace a conventional inductive coupling WPT, because it has no electromagnetic interference, but the capacitive WPT has limitation due to too small coupling capacitance. Therefore, to utilize the capacitive WPT system the switching frequency should be as high as possible: therefore, challenges associated with the design of the power converter working in MHz range will be discussed in details. A calculation of passive components, matching the network and capacitor plate design methodology is given in the paper. The design of the prototype of the capacitive WPT will be described in the paper. This paper proposes to use two copper plates to transfer power, the plates are adopted to generate electric fields and transfer power from the primary side to the secondary side. The equations for calculation of capacitance of the plates are given in the paper. An important task is to calculate the resonant network that generates high voltage in the circuit for high power transfer. The high switching of inverter transistors requires high performance transistors with optimized driver circuit. The design of the inverter and driver circuit is discussed and experimental results are shown.
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