Design of a Highly Efficient Inductive Power Transfer (IPT) System for Low Voltage Applications

Inhalt:
In this contribution design variants for SS-compensated IPT systems in high power low voltage applications (<100 V on the output side) are investigated. The analysis in this paper is focused on the optimal power electronics topology including primary and secondary DC/DC conversion and the winding ratio of the magnetic coupler. The objective is the maximization of the overall system efficiency. By an analytical approach basic equations are derived which are of general significance for the design of IPT systems with secondary DC/DC-Conversion. A power loss simulation is carried out to determine the optimal overall system design including the power electronic components and semiconductors. The validity of the results is exemplarily shown on a 6 kW prototype with an input voltage of 400 VDC and low output voltage of 24 VDC (battery voltage) in the laboratory. A high efficiency between 89 and 94.2 % can be achieved in any operation point between 1 and 6 kW output power and a wide range of magnetic coupling conditions.