Abstract: An induction heating or melting system and a power conversion system thereof has an induction heating coil, an active rectifier having rectifier transistors, a DC link circuit coupled to an output of the active rectifier, an inverter having inverter transistors and an input coupled to the DC link circuit, a resonant tank circuit coupled to an output of the inverter and having the induction heating coil, a rectifier controller configured to control the rectifier transistors at a generally constant angle between triggering of the rectifier transistors relative to an AC input phase voltage using sinusoidal pulse width modulation (SPWM) with modulation index (MI) control to control a system output power, an inverter controller, and an input filter coupled to an input of the active rectifier.

Abstract: Induction heating apparatus and methods are presented for pipe end heating using a solenoid coil to heat a controlled length of a pipe workpiece by adjusting the relative positions of the solenoid coil with a flux diverter positioned relative to the pipe end to divert flux from the coil to control inductive heating of the pipe workpiece end.

Abstract: Induction heating apparatus and methods are presented for pipe end heating using a solenoid coil to heat a controlled length of a pipe workpiece by adjusting the relative positions of the solenoid coil with a flux diverter positioned relative to the pipe end to divert flux from the coil to control inductive heating of the pipe workpiece end.