Non-Contact Energy Transfer System Using Immittance Converter

Abstract

Non-Contact Energy Transfer Systems are widely used in industrial material handling systems. This paper proposes a new Non-Contact Energy Transfer System using a tuned pick-up coil and an Immittance converter inductively coupled to a parallel transmission line excited by a high frequency constant current source.
In a Non-Contact Energy Transfer System which supplies continuous energy to movers by electromagnetic induction, the efficiency is low owing to low excitation impedance because of the wide air gap of the magnetic core in the pick-up coil. The excitation impedance can be increased by the resonance with a capacitor connected parallel to the pick-up coil. The resonant pick-up coil works as a high frequency constant current source for the load. We propose using an Immittance converter to transform the high frequency constant current source into a high frequency constant voltage source. Then, the high frequency constant voltage source is rectified into a constant voltage DC source, and supplies power to an inverter for motor driving.
In this paper, the configuration of this new Non-Contact Energy Transfer System and its characteristics are described. The experimental results and simulation waveforms are also described.