Patent ID: 6720537
Filing Date: 2004-04-13
Classification: D06F,H05B

Abstract:
A device for detecting, monitoring and controlling the operating status of an electric flat-iron which is provided with at least one electric heating circuit having a heating element and a first power switch of the flat-iron in the form of a thermostatically controlled ON/OFF switch connected in series to the heating element for controlling the temperature of the electric flat-iron, wherein said device comprises:a control unit being provided as an integrated circuit; a second power switch which is controlled by the control unit depending on the operating status of the electric flat-iron and which is connected in series with said electric heating circuit; an indicator unit having at least one indicator element for indicating the heating status of the electric flat-iron; a low voltage power supply directly energized by the line voltage supply without galvanic isolation for energizing at least one of said control unit, said indicator unit, and said second power switch; a low-impedance measuring resistance being connected in series with said second power switch and providing an indirect detection means of the switching status of both power switches; means for supplying a voltage drop arising at the measuring resistance as an input signal to said control unit for evaluating said input signal with respect to the status of the electric flat-iron; and means for supplying a control signal from said control unit to said indicator element for indicating the present heating status of the electric flat-iron.