Electric heating – Heating devices – With power supply and voltage or current regulation or...
Reexamination Certificate
2006-03-07
2006-03-07
Hoang, Tu (Department: 3742)
Electric heating
Heating devices
With power supply and voltage or current regulation or...
C219S490000, C219S497000
Reexamination Certificate
active
07009152
ABSTRACT:
A control device for an electric blanket includes a voltage drop rectifier circuit connected to an AC power source, a control gate circuit, a zero-across detecting circuit connected to the AC power source, a central processing circuit connected to the zero-across detecting circuit, an activating circuit, and a button circuit. The control gate circuit includes a triac electrically connected in series to the AC power source. The activating circuit includes an input connected to the central processing unit and an output connected to the gate of the triac of the control gate circuit. The central processing circuit includes a central processor and outputs signals to control the activating circuit, the control gate circuit, and the heating element such that the heating element is activated when the zero-across detecting circuit detects that a voltage of the AC power source approximates zero and thus sends a signal to the central processing circuit.
REFERENCES:
patent: 3727080 (1973-04-01), Hanchett
patent: 4277671 (1981-07-01), Mori et al.
patent: 4441069 (1984-04-01), Mendelson
Suen Ching-Fwu
Yu Link
Baxley Charles E.
Hoang Tu
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