Patent ID: 7390992

Claim:
Heat blanket comprising an operative unit and a control/power supply unit which can be electrically connected on one side to the power mains and on the other side to the operative unit, wherein: a) the operative unit comprises: a foldable sheet, a linear heating element distributed in the sheet, with a first and a second conductor extending one along the other, separated by a first electrically insulating material and enclosed by a second electrically insulating material, wherein the first and the second conductors are electrically connected to the control/power supply unit and have respective first terminals inside the panel, connected together; and b) the control/power supply unit comprises: a power supply group for the heating element, intended for connection to the electric mains, a controller of the power supply for the heating element, characterized in that the controller comprise: a power supply cut-off for the heating element, a microprocessor, connected to the heating element, to the power supply group and to the cut-off group, set to detect possible anomalies in the power supply conditions of the heating element and to act upon the cut-off group interrupting the power supply of the heating element when said anomalies take place; said microprocessor being further configured to classify each anomaly detected as a temporary anomaly or as a definitive anomaly; and said microprocessor being further configured to interrupt the power supply reversibly in the case of a temporary anomaly and to interrupt the power supply irreversibly in the case of a definitive anomaly.