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Power control for appliance having a glass ceramic cooking surface

  • US 4,816,647 A
  • Filed: 11/13/1987
  • Issued: 03/28/1989
  • Est. Priority Date: 11/13/1987
  • Status: Expired due to Fees
First Claim
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1. In a household cooking appliance of the type having a glass ceramic cooking surface for supporting loads to be heated, and at least one radiant heating unit disposed beneath the glass ceramic cooking surface to heat loads supported thereon, a power control system comprising:

  • temperature sensing means for sensing the temperature of the underside of the glass ceramic support surface proximate the heating unit;

    user actuable input selection means for enabling the user to select one of a plurality of power settings for the heating unit;

    at least one of said plurality of power settings having associated with it predetermined maximum and minimum reference temperatures defining a temperature band representative of the steady state temperature range of the underside of the glass ceramic support surface proximate the heating unit when heating loads at that power setting; and

    power control means responsive to the input selection means, operative to operate the heating unit at a steady state power level corresponding to the user selecting power setting;

    said power control means including means responsive to said temperature sensing means for operating the heating unit at a power level other than the power level corresponding to the user selected power setting when the sensed glass ceramic support surface temperature is outside said predetermined reference temperature band associated with the selected power setting to cause the heating unit to respond quickly to changes in the user selected power setting.

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