General Analysis of LC Resonance Principles for Inductive Power Transfer Systems

Inductive power transfer (IPT) technology, which can deliver power through varying magnetic fields without physical contact, has been widely used in many applications with significant advantages over the traditional plug-in system. Compensation topologies with constant current (CC) or constant voltage (CV) play essential roles in IPT charging system. This paper provides four basic LC resonance principles for CC or CV outputs and two basic impedance regulation principles for resistant, inductive or capacitive input impedance. Arbitrary compensation topologies with load-independent current or voltage outputs can be modelled as a combination of various LC resonance circuits. The output characteristics of the compensation topologies are easily understood with the help of the basic principles. Based on the LC resonance principles, a new parameter tuning method for LCC/LCC compensation topology with CV output is proposed and that is verified by corresponding experimental results.