Citation:
Luk, P. C-K. et al. (2015) State-Space Modeling of a Class E2 Converter for Inductive Links, IEEE Transactions on Power Electronics, Vol. 30, Iss. 6, pp. 3242-3251
Abstract:
This paper presents a state-space-based analysis of
a Class E2 converter for wireless power systems based on a twocoil
inductive link. The Class E2 converter consists of a 200-kHz
Class E inverter as the primary coil driver and a voltage-driven
Class E synchronous rectifier at the secondary coil of the inductive
link. A piecewise linear seventh-order state-space model is used
to calculate several parameters and values to achieve optimum
switching operation of the Class E inverter and the Class E recti-
fier. Simulation results are presented to compare the accuracy of
the state-space modeling approach with the established analytical
approach. For validation of the state-space analysis, an investigation
of the influence of variation of coil alignment and load for a
20-W Class E2 converter prototype system is performed by means
of a novel compensation method that maintains optimum switching
conditions irrespective of variations. Experimental results are
presented to confirm the accuracy of the state-space modeling approach
over a wide range of operational conditions and the utility
of the compensation method.
