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Average power level controller

  • US 5,140,255 A
  • Filed: 04/26/1991
  • Issued: 08/18/1992
  • Est. Priority Date: 01/10/1989
  • Status: Expired due to Fees
First Claim
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1. A controller associated with a dissipative electric load, that controls the level of average power applied to the aforesaid load by an electric energy distribution network that supplies said dissipative load with an AC supply voltage having a typical frequency value of 60 Hz via high power transformers that filter AC signals from high frequency signals, comprising:

  • (i) means for detecting a predetermined pulse duration modulation signal embedded in the level of the supply voltage provided by the distribution network, said duration signal being a low frequency signal having a minimum width of greater than several seconds so that said duration signal may be transmitted through said high power transformers, said duration signal having a duration indicative of a command for determining the level of average power applied to said load; and

    (ii) means for transmitting electric power originating from the distribution network to the load, the aforesaid means for transmitting comprising means for reducing the level of average power transmitted to the load, in response to said duration signal which is indicative of the command as detected by said means for detecting.

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