Abstract

In this paper three starting methods for an inductive heating equipment are proposed and analyzed. Starting concerns energization and control sequence. The equipment is based on a parallel resonant inverter connected to a resonant tank (coil and susceptor in parallel with a capacitor) for inductive heating applications. The inverter consists of a current source single-phase H bridge, which operates at the resonant frequency of the tank. The inverter is fed by a current controlled buck DC-DC converter, connected to the output of a six pulses bridge diode rectifier. The paper details the proposed starting methods and experimental results obtained in a 15kW, 540V DC laboratory prototype are presented. The operating frequency of the DC-DC buck converter is 2kHz and a the load resonant frequency is around 4,3kHz.