Patent
Temperature control apparatus
Masanori Endo,Ken Miyagi +1 more
TLDR
In this article, a temperature control apparatus comprising an electric heater, switching means connected between the heater and an AC electric power source, and a thermo-detector means thermocoupled with the heater means to turn on and off the switching means below and above a predetermined temperature.Abstract:
A temperature control apparatus comprising an electric heater means, switching means connected between the heater means and an AC electric power source, and a thermo-detector means thermocoupled with the heater means to turn on and off the switching means below and above a predetermined temperature, in which a thyristor is employed for the switching means, the thermodetector means being a transformer which has a primary winding connected to the power source through a resistor means, a secondary winding connected to the control terminal of the thyristor and a core of magnetic materials having a Curie point of the predetermined temperature, a low coercive force and a high differential permeability at a magnetic field strength equal to the coercive force. Outputs on the transformer secondary winding fire the thyristor at each zero voltage of the AC voltage to permit the heater means to be excited below the predetermined temperature. No output is present on the secondary winding above the predetermined temperature so that the thyristor is not fired. An inductor having a winding and a core of similar magnetic materials as above may be substituted for the transformer to perform the same purpose, in which case the self-induced voltage on the inductor winding is coupled to the control terminal of the thyristor.read more
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Patent
Electric cooking apparatus having thermomagnetic temperature control means
Sakamoto Tatsuo,Sano Yoshiaki +1 more
TL;DR: In this article, the Curie effect is used to adjust the temperature of the cut out temperature of a hot plate, coffee pot, or egg boiler. But the temperature is not adjusted by the temperature adjuster.
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