Analysis and Design of a Current-Fed Resonant Inverter for Sinusoidal Excitation of Magnetic Components in the Megahertz Range

This paper deals with the theoretical analysis and construction of an inverter that is suitable as an excitation source for high-frequency measurements (up to 1.3 MHz) on magnetic components. Quantities as output current, operation frequency range, and harmonic content of the output voltage are discussed. The interaction between the power part and the control circuit is investigated by experimental verification of the theoretically extracted equations that describe the inverter´s operation. As an application example, the proposed inverter is used for the implementation of ferrite core specific loss measurements in a frequency range not included in the data sheet and for the investigation of high-frequency insulation performance of enameled wires.