Electric heating – Heating devices – With power supply and voltage or current regulation or...
Reexamination Certificate
2006-11-21
2006-11-21
Evans, Robin O. (Department: 3742)
Electric heating
Heating devices
With power supply and voltage or current regulation or...
C219S501000, C219S504000, C219S492000, C219S494000, C219S212000
Reexamination Certificate
active
07138611
ABSTRACT:
A heating structure and its temperature control method having therein a heat generating line and a controller. The heat generating line includes a PTC element and a short circuit line serially connected having an insulating fusible layer separating them. When a user sets a heating temperature, electric current is conducted to heat the PTC element, alternative string wave signals input into an AC phase shaping circuit and an AC phase delay shaping circuit are converted into square wave signals; and by measuring with a microprocessor at a given time the phase shift between the two phase shaping circuits to control the switch of a trigger circuit, the PTC element can keep on heating or reduce its temperature to therefore keep the heat generating line at a predetermined working temperature. The structure is applicable to heat generating devices such as electric ovens and heating blankets etc.
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Evans Robin O.
Ralis Stephen J.
Troxell Law Office PLLC
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