A high density three phase high frequency link system for variable frequency output

A three phase converter was implemented using a self-oscillating inverter as the primary inverter and a direct converter as the secondary converter. The different structures that can be used for the secondary converter are investigated systematically with a view to reduction of component count, stresses, low weight, and high packing density. The problem of synchronization between the two converters was solved by using a simple magnetic circuit. The primary converter had to be overdimensioned by a factor 1.732 due to the reactive power which had to be supplied by the primary converter. Fundamental problems in the implementation, however, were not found. Experimental results are given.<>