The paper proposes a hands-free inductive power transfer system for charging the batteries of an electrical vehicle. A typical system comprises a power supply, a transfer pad on the ground, a receiving pad on the vehicle together and a power regulator. This paper describes the design of the power regulator which must ensure continuous power flow at high efficiency despite wide separation between the charging pads as a result of variation in the vehicle to ground heights. The paper also discusses the need to meet new and stringent electromagnetic field exposure regulations. Measurements show good efficiency across various separations and emissions compliance providing the pad is placed underneath the vehicle.
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Huang et al. (2009) studied this question.
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