Surge Analysis of Induction Heating Power Supply

Surges are undesirable with respect to both the reli- ability and the efficiency of power devices. In this paper, the surge mechanism of an induction heating power supply is studied. First, a modified phase locked loop (PLL) controller is proposed such that the changing resonant frequency of the heated load can be tracked correctly and the zero voltage switching (ZVS) can be re- liably maintained simultaneously. Then, a very simple and prac- tical surge model is proposed. Surge analyzes for both ZVS and non-ZVS modes are made in sequence. It is found that the extra energy built up in the line inductance during the reverse recovery process of the diodes plays a very important role in generating huge voltages. Finally, some simulation and measured results are pro- vided to verify the validity of the proposed surge model.

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