Two-level temperature control for induction heating

Details Two-level temperature control for induction heating Two-level temperature control for induction heating

1975-04-07

1977-06-28

Reynolds, Bruce A.

Electric heating

Metal heating

Of cylinders

219 1053, 219 1041, H05B 504

Patent

active

040327400

ABSTRACT:
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.

REFERENCES:
patent: 2267001 (1941-12-01), Toulmin
patent: 2988623 (1961-06-01), Ross et al.
patent: 3183294 (1965-05-01), Kasper
patent: 3591752 (1971-07-01), Valdes
patent: 3740859 (1973-06-01), Patton et al.
patent: 3781504 (1973-12-01), Harnden
patent: 3816690 (1974-06-01), Mittleman
patent: 3845268 (1974-10-01), Sindt

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