Control unit of induction heating unit, induction heating system, and method of controlling induction heating unit

摘要

A control unit of an induction heating unit controls AC power output to a heating coil of a transverse type induction heating unit that allows an alternating magnetic field to intersect a sheet surface of a conductive sheet that is being conveyed to inductively heat the conductive sheet. The control unit includes: a magnetic energy recovery switch that outputs AC power to the heating coil; a frequency setting unit that sets an output frequency in response to at least one of the relative permeability, resistivity, and sheet thickness of the conductive sheet; and a gate control unit that controls a switching operation of the magnetic energy recovery switch on the basis of the output frequency set by the frequency setting unit.

主权项

1. An induction heating system which allows an alternating magnetic field to intersect a sheet surface of a conductive sheet which is being conveyed to inductively heat the conductive sheet, the induction heating system comprising:
an induction heating unit including a heating coil which is disposed to face the sheet surface of the conductive sheet; and a control unit which controls an AC power to output to the heating coil, wherein the induction heating unit includes: a core around which the heating coil is wound; and a shielding plate which is disposed to face a region including an edge of the conductive sheet in a width direction, the shielding plate having a depressed portion at a surface which faces the conductive sheet, and the shielding plate being formed from a metal that is a paramagnetic substance or a diamagnetic substance, and wherein the control unit includes: a magnetic energy recovery switch which outputs the AC power to the heating coil; a frequency setting unit which sets an output frequency in response to at least one of a relative permeability, a resistivity, and a sheet thickness of the conductive sheet; and a gate control unit which controls a switching operation of the magnetic energy recovery switch on the basis of the output frequency set by the frequency setting unit.