Fast Switching Planar Inductance Current Source ZETA Converter with Integrated Common Mode Filter

The ZETA topology provides unique opportunities as a source for current-fed inverter systems. This topology enables coupling of input and output inductor to reduce the current ripple. In this paper, design aspects for a coupled inductor with an integrated common mode filter are described and the advantages to provide a current source characteristic using a ZETA converter are discussed. Relevant parasitic inductances and capacitances are calculated using finite element analysis and analytical models. The behavior of the multiphysics system consisting of electrical and magnetical domain is considered using a numerical system simulation including parasitic elements. This simulation shows good results and is compared to experiments. The experimental setup is using gallium-nitride eHEMT transistors with switching frequencies up to 1 MHz.