Patent ID: 9000331
Filing Date: 2015-04-07
Classification: B60N,B60R,B62D

Abstract:
1. Capacitive sensing system for being connected to a heating element producing heat upon electrical current being caused to flow across it, said capacitive sensing system comprising a capacitive detector connectable to said heating element, configured for driving an alternating current into said heating element and for producing an output indicative of capacitance based upon said alternating current; a common mode choke having a first winding for connecting a first terminal of said heating element with a first terminal of a heating current supply and a second winding for connecting a second terminal of said heating element with a second terminal of said heating current supply, said common mode choke essentially preventing said alternating current from flowing from said heating element to said heating current supply; wherein said common mode choke comprises a third winding connected in parallel of at least one of said first and second windings, said capacitive detector being further configured for measuring a portion of said alternating current flowing across said third winding and for taking into account said measured portion of alternating current when producing said output.