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.