Controlling Multiple Induction Heating Loads Fed from a Common Power Source

Abstract

Techniques have been developed for use in supplying several induction heating loads from a common 3000-Hz power source and for controlling power delivered to each load without excessive interaction. These techniques include the use of saturable reactors for control of delivered power, with capacitance placed across the line before the reactors and a limitation made on the rate of change of delivered power. In addition, fast-response voltage regulation of the output bus, after the load-matching transformer, is used along with physical isolation of power components after the voltage-regulated bus.