Abstract:
In an Inductively Coupled Power Transfer (ICPT) system, a multiplicity of (moving) loads
take power from an elongated conductive loop (track) excited by a current in the range of 15-125A
by magnetic induction at a VLF frequency of between 5-50kHz. In this application, the track performs
the same function as a distribution line in a power system. However, frequency deviations
cannot be tolerated in ICPT systems and therefore there are difficulties with inrush power surges
as loads switch on. In severe cases, the inrush surge may compromise the security of the whole
system.
This paper proposes a solution to this problem using an ICPT pickup controller with input shaping
where the poles that can cause an inrush are not excited. The paper is supported by theoretical
analysis and experimental measurements and is applicable across a wide range of ICPT sizes and
applications. The solution reduces the inrush effects to 10% of an uncontrolled system.