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Switching circuit controlling multiple heating elements

  • US 20070102422A1
  • Filed: 10/31/2006
  • Published: 05/10/2007
  • Est. Priority Date: 11/04/2005
  • Status: Active Grant
First Claim
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1. A switching circuit comprising a plurality of heating elements, each connected as part of a tuned circuit, the tuned circuits being respectively tuned to different frequencies and connected in parallel between two common conductors, the circuit further comprising means for applying an oscillating signal voltage between the two common conductors, at one or more frequencies each corresponding to a tuned frequency of one of the tuned circuits.

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