609279 Disclosed is a heat blanket. The blanket includes a power supply control unit (300) and an operating unit (400) that includes a foldable sheet and a heating element (100) distributed within the sheet. The power supply control unit (300) is electrically connectable on one side to an alternating current electric supply and on the other side it is electrically connectable, through an interconnection cable comprising two conductors (510, 520) only, to the operating unit (400). The power supply control unit (300) contains means for supplying the heating element (100) with alternating voltage having first and second polarity managed in a separate way. The first polarity is managed by an electro-mechanical switch (202) connected in series to a diode type semiconductor (201), while the second polarity is managed by a switching element (203) controlled by an electronic circuit (206).
