Experimental results of electric protections for a controlled current source resonant converter

In this paper, the design of electric protections for a controlled current source resonant converter and the corresponding experimental results are presented. This converter was designed for an induction heating current controlled system and is formed by a non-controlled rectifier, a DC-DC buck converter and a current source resonant inverter using IGBT's. The electric protections are focused to overvoltage, overcurrent and overheating protections and some strategies for those special cases of failures in semiconductors. Experimental results are shown for a 15 kW laboratory prototype.