Inductive heating device

摘要

Disclosed is an inductive heating device which can lower losses in the device and readily provide cooling, wherein a controller is operated in a first control mode which controls the operation so that a unipolar first switching element and a unipolar second switching element conduct alternately when one of a bipolar third switching element and a bipolar fourth switching element is conducting and the other is disconnected when an aluminum object to be heated is heated, and in a second control mode in which the conduction of the first switching element and the fourth switching element and the conduction of the second switching element and the third switching element alternate when an iron object to be heated is heated.

主权项

1. An inductive heating device for inductively heating a material, the device comprising:
a smoothing part having output ends; a first series circuit comprising a first switching element and a second switching element connected between the output ends of the smoothing part; a second series circuit comprising a third switching element and a fourth switching element connected between the output ends; a heating coil; a resonance circuit comprising a resonance capacitor connected between a connection point of the first and second switching elements and a connection point of the third and fourth switching elements, and the heating coil; and a control part that varies the magnitude of the resonance current in the resonance circuit, between a first mode for alternately operating the first and second switching elements in a state of conducting either one of the third and fourth switching elements and cutting off the other, and a second mode for alternately conducting the first and fourth switching elements and conducting the second and third switching elements, wherein the first and second switching elements comprise unipolar type switching elements, and the third and fourth switching elements comprise bipolar type switching elements, and the control part operates in the first mode for alternately operating the first and second switching elements in a state of conducting the fourth switching element and cutting off the third switching element upon heating a material comprising aluminum, and operates in the second mode for conducting the first and fourth switching elements and alternately conducting the second and third switching elements upon heating a material comprising iron.