Load adaptive medium frequency resonant power supply

Abstract

The fast development in low power electronics, micro-systems technology and wireless communication enables totally new system concepts that call for new and cheap supply options. In several applications wired energy transfer is not suitable or possible, for example in robot type applications or in fully automated production machines as well as in medium or high voltage applications with high insulation requirements. There are solutions where nonconventional transformers with, for example, a large air-gap in the magnetic path, are operated with resonant switch mode supplies to supply energy to the load. In this paper we present a resonant supply converter system enabling totally wireless applications by providing auxiliary energy without wires via magnetic fields over distances of up to several meters and covering volumes of e.g. 100 m/sup 3/, suited for the wireless supply of robot applications or highly automated manufacturing machines (sensors, communication, actuators).