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ANTI-CONDENSATION CONTROL SYSTEM

  • US 20100083672A1
  • Filed: 12/18/2008
  • Published: 04/08/2010
  • Est. Priority Date: 10/03/2008
  • Status: Active Grant
First Claim
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1. An anti-condensation control apparatus comprising:

  • a sensor circuit comprising a humidity sensor and configured to provide a sensor signal indicative of a relative humidity (RH) on or near a control surface; and

    a control circuit comprising a phase control circuit configured to;

    receive the sensor signal and a high-voltage AC power input, andmodulate a phase of the high-voltage AC power input at least partly in response to the sensor signal in such a manner that a phase-modulated AC power output provided to a heater is;

    a) substantially constant at a minimum power level (Pmin) in a low RH region ranging from 0% RH to a first RH (RH1),b) linearly varying from Pmin to a maximum power level (Pmax) in an intermediate RH region ranging from RH1 to a second RH (RH2), wherein the position of RH1 and/or RH2 is user-adjustable, andc) substantially constant at Pmax in a high RH region ranging fromRH2 to 100% RH,wherein the phase control circuit does not comprise a digital logic circuit.

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