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Seat heater

  • US 9,815,394 B2
  • Filed: 08/17/2011
  • Issued: 11/14/2017
  • Est. Priority Date: 08/20/2010
  • Status: Active Grant
First Claim
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1. A seat heater in combination with a capacitive sensing device, comprising:

  • an electric heating element connected between a first node and a second node to dissipate heat when a heating current is caused to flow between said first and second nodes, across said heating element;

    a first electric component connected between said first node and a third node, said third node being operatively connectable to a first terminal of a power supply, said first electric component providing a controllable first conductance between said first and third nodes;

    a second electric component connected between said second node and a fourth node, said fourth node being operatively connectable to a second terminal of said power supply, said second electric component providing a controllable second conductance between said second and fourth nodes;

    a control network having a mode of operation in which said control network applies an oscillating signal to said heating element, said control network being connected to said first electric component to control said first conductance and to said second electric component to control said second conductance;

    wherein, for applying said oscillating signal to said heating element, said control network is configured to modulate said first conductance and said second conductance in such a way that a variation of a voltage drop between said first and third nodes is of the same amplitude but of opposite sign to a variation of a voltage drop between said fourth and second nodes.

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