Two-level temperature control for induction heating apparatus

H - Electricity – 05 – B

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H05B 6/06 (2006.01) B23K 13/00 (2006.01) G05D 23/27 (2006.01) H05B 6/10 (2006.01) H02M 7/515 (2006.01)

Patent

CA 1053338

Abstract of the Disclosure An induction heating apparatus and related temperature control circuitry and method of controlled heating of a workpiece at two temperature levels. The apparatus and method utilizes a temperature sensing device, adjustable reference temperature circuitry utilizing a voltage dividing circuit triggered by a timing circuit to heat the workpiece to a first predetermined temperature, dwell at the predetermined temperature for an amount of time governed by the timing device and continue heating the workpiece to a second predetermined desired temperature. The method and circuitry being particularly useful in heating a laminar structure where a ferromagnetic material is coated with a surface of nonconducting, nonferromagnetic material, such as paint.

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