The aim of this paper is to design a modular,
fault tolerant multi transmitter(Tx) -multi receiver(Rx) parallel
connected common DC bus inductive power transfer(IPT) system
to replace slip rings in wind turbines or brushless exciters. In
parallel connected common DC bus systems, current unbalance
is a major issue which results in thermal stresses and over
current or voltages. In this paper, two different new current
balancing methods are proposed: Cross-coupled Rx modules and
intentional miss-tuning of Rx side resonant frequency. These
methods are investigated both analytically and experimentally
for a single Tx and two Rx system for a 500 W prototype.
The proposed methods are tested independently, and then the
combined current balancing method is also investigated. For the
same missalignment case cross-coupled/de-tuned has a 55.8%
current balancing improvement compared to de-coupled/fullytuned topology.
Balancing of Common DC-Bus Parallel Connected Modular Inductive Power Transfer Systems