Abstract:
For loosely coupled transformers, the leakage and magnetizing inductances vary as a
consequence of the changing positions for the primary and the secondary sides of the
transformer windings in inductive power transfer (IPT) systems. For reducing the effects
of these varying inductances, various compensation networks have been proposed.
These compensation networks are used to attain a constant output voltage and unity
power factor for power electronic applications. However, most of these compensation
networks have a fixed compensation network designed for only a specific coupling
coefficient. Therefore, a compensation network with variable components needs to be
implemented to compensate for the changing inductances of the network. In this thesis,
switched capacitor-based compensation network is proposed to match the resonant
frequency of the network with the switching frequency of the converter. The proposed
network compensates for the magnetizing inductance for coupling coefficient in the
range of 0.23 to 0,35 using a switched capacitor. Moreover, the proposed converter is
symmetrical so that bidirectional power flow is possible while maintaining constant
output voltage and unity power factor under zero voltage switching condition (ZVS). A
comparison between the two most used compensation configurations: LC-series and
LCL topology is also presented. Moreover, an additional modified configuration of LCL
topology with a switch-controlled capacitor is also presented under various coupling
conditions. The system performance under these three configurations is presented and a
comparison between LCL topology using a fixed capacitor and a switch-controlled
capacitor is shown to present the system performance under the different coupling
conditions
