Abstract
This paper proposes a new method to generate high frequency currents for inductive power transfer systems where AC-DC-AC or DC-AC converters are being used. There are a lot of circuit and controller design issues associated with these traditional converters. A DC link has to be used as a middle stage for high frequency current generation even when a low frequency AC source is available, which causes large system cost, size, as well as power losses and maintenance associated. Unlike matrix converters having complicated switching topologies and control, the new converter proposed in this paper is based on simply free oscillation and energy injection control. It can achieve DC to AC inversion, or direct AC to AC conversion without using any DC links, thus a low frequency utility power source at 50/60Hz can be converted to a high frequency current source along a track loop directly. Furthermore, soft switching techniques are applied to minimize the power losses and EMI, and the track current magnitude can be controlled easily without any overshoots. Theoretical analysis, simulation and experimental results have demonstrated the new converting method is valid for high frequency currents generation for most inductive power transfer systems.
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