Patent ID: 7009152

Claim:
A control device for an electric blanket, comprising: a voltage drop rectifier circuit ( 1 ) electrically connected to an AC power source; a control gate circuit ( 2 ) including a triac electrically connected in series to the AC power source, the triac being connected to a heating element ( 91 ) and including a gate; a zero-across detecting circuit ( 3 ) electrically connected to the AC power source; a central processing circuit ( 5 ) connected to the zero-across detecting circuit ( 3 ), the zero-across detecting circuit ( 3 ) sending a signal to the central processing circuit ( 5 ) when a voltage of the AC power source approximates zero; an activating circuit ( 4 ) including an input connected to the central processing unit ( 5 ), the activating circuit further including an output connected to the gate of the triac of the control gate circuit ( 2 ); and a button circuit ( 6 ) connected to the central processing unit ( 5 ), the central processing circuit ( 5 ) including a central processor (U 1 ) and outputting signals to control the activating circuit ( 4 ), the control gate circuit ( 2 ), and the heating element ( 91 ) such that the heating element ( 91 ) is activated when the zero-across detecting circuit ( 3 ) detects that a voltage of the AC power source approximates zero and thus sends a signal to the central processing circuit ( 5 ).