Abstract
An inductive power transfer (IPT) system has lower peak efficiency and significantly lower load-average efficiency over the entire range of output power than typical power conversion systems because it transmits power wirelessly through magnetically coupled coils. In order to improve the load-average efficiency of the IPT system, this paper proposes an integrated control strategy consisting of full-bridge, phase-shift, and half-bridge control modes. The coupling coefficient and output power conditions for each control mode are theoretically analyzed, and the proposed control algorithm is established. In order to verify the analysis results, a 3.3 kW IPT system prototype is constructed, and it is experimentally verified that the load-average efficiency is improved by up to 3.75% with respect to the output power when using the proposed control scheme. In addition, the proposed control has the additional advantage that it can be directly applied to the existing IPT system without changing or adding hardware.
Highlights
Efficiency is an essential factor for evaluating the performance of power conversion systems (PCSs)
Owing to the development of next-generation power electronic devices, such as gallium nitride (GaN) and silicon carbide (SiC) devices, many DC–DC converters have achieved a peak efficiency of 98–99% [1,2,3]
A major factor exists that makes it difficult and challenging to improve the efficiency of the inductive power transfer (IPT) system: the coupling coefficient k between the two coils is small compared to that of a typical transformer, and it varies with respect to the vertical distance changes and horizontal misalignment, which depend on the type of vehicle, tire pressure, and parking position
Summary
Efficiency is an essential factor for evaluating the performance of power conversion systems (PCSs). In the case of primary-side LCC networks, which have been widely used in IPT systems, the primary coil current is independent of the load and coupling coefficient variations at the resonant frequency [15,16,17]. The reduction of this current can improve the light-load efficiency and the coil-to-coil efficiency, which is the main cause of decreased efficiency of the IPT system. The proposed control method increases the coil-to-coil efficiency and the light load efficiency by reducing the load-independent primary coil current in the primary LCC network.
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