Patent ID: 6943327

Claim:
A method for continuously controlling the heating of heating elements, particularly heating elements in an automotive vehicle seat comprising: providing a control circuit for providing an electrical current to at least one heating element using Pulse Width Modulation (PWM) adapted to receive signals from at least one temperature sensor, each of at least one temperature sensor substantially constantly monitoring at least one heating element temperature; providing a heating current to each of said at least one heating element, the heating current voltage being controlled by Pulse Width Modulation (PWM) by said control circuit; substantially constantly adapting a voltage signal applied to each of said at least one heating elements in an initial transient state during which a maximum voltage is applied to each of said at least one heating elements until said at least one heating elements have reached a desired percentage of a desired temperature, and then in a permanent state during which said voltage signal is applied in the form of a fixed frequency pulse train and variable working cycle characterized in that said voltage applied to said at least one heating element is modified by the physical features of each of said at least one heating elements and the surrounding environment of said at least one heating elements substantially constantly throughout the life of said at least one heating element.