Inductive Heating Facility of Half-bridge Inverter Structure

Abstract:- Nowadays the inductive heating technique is very popular in Taiwan, and this promoted research in this field directing to higher power, higher frequency, and higher efficiency as well. But most of the circuit structure in large capacity devices was adapted with Half-bridge or Full-bridge structure in Inverter. In this study, a half-bridge driven by fixed-frequency was implemented in a variable power, constant frequency inductive heating facility in which the circuit was adapted Resonant- Transition in Zero-Voltage-Switching, Clamped-Voltage (ZVS-CV). The power elements were selected Isolated Gate Bipolar Transistor-IGBT with 600 volts Voltage Endurance and 60 Amperes Endurance current while driving signal was switched by Pulse Width Modulation (PWM). The generating power was controlled by adjusting the turn-on timing of IGBT, in this way, the power factor of power-source side was highly promoted, and the driving signal was generated by TMS320F240 (DSP), so as well as detected the status of whole system with sampling in AD converter channels of DSP. Due to the design of this model the high performance was easily gained. The analysis of power change by adjusting Duty-cycle, the loading current waves, EMC under different operating frequency were verified and matched with the original theory through simulation with Is-Spice Software