Development of 1 MHz capacitive wireless power transfer coupler for charging system

Nurashid, Amin (2022) Development of 1 MHz capacitive wireless power transfer coupler for charging system. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Charging stations with capacitive interfaces are simple and inexpensive. Two important benefits are the low level of electromagnetic waves and the possibility to integrate energy and data transmission across the same channel. A capacitive power transfer circuit based on soft switching is suggested, which employs series resonant frequency to facilitate successful high frequency, medium voltage operation. The package includes research that predicts fundamental constraints on the highest possible efficiency for a given amount of coupling capacitance, which is used to establish the ideal circuit control parameters and operating point. Automatic tuning loops ensure that the circuit performs at the optimal frequency a under a broad range of coupled capacitance and load conditions. With only 20 pF of coupling capacitance, an example interface achieves respectable efficiency at 30V. The frequency is adjusted to 1 MHz by an automated tuning loop, allowing a wide range of applications in the nominal coupling capacitance. The duty cycle is also automatically modified to keep the output power to the load at its highest efficiency.

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