Wireless charging technology for heavy-duty vehicles, such as electric buses, has been actively investigated with a view to accelerate the deployment of an important form of eco-friendly transportation. We have developed a wireless power transfer (WPT) system for the rapid charging of electric buses. Most of the performance targets were achieved: the maximum electric power received was 44kW or more, the maximum misalignment tolerance of the transmit and receive charging pads was +/- 10cm or more, and the radiated emission was reduced in accordance with the limits specified by the Radio Act. This paper presents a design method for low radiated emission, and the evaluation of the WPT system.
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