Transistor Voltage Source Inverter for Induction Heating

Abstract

This paper presents a comparative analysis between a series turned and paralleled tuned induction heating load fed by a transistor voltage source inverter. The operation of the two systems are comparatively evaluated on the basis of the following three control schemes: DC input voltage control; Frequency control; and Pulse width modulation control. The results of the comparison lead to the following conclusions: the voltage source inverter is much more suitable for driving a series tuned load; the variable frequency controlled VSI is not suitable for driving a parallel tuned load; the optimal control method for a parallel tuned load is DC input voltage control; the variable DC voltage controlled VSI is optimally utilized at a leading power factor when operating at increasing frequency and power levels.

Indexing terms:

• Voltage source inverter
• Pulse width modulation
• Frequency modulation
• Induction heating