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Remote control of fluorescent lamp ballast using power flow interruption coding with means to maintain filament voltage substantially constant as the lamp voltage decreases

  • US 5,107,184 A
  • Filed: 08/13/1990
  • Issued: 04/21/1992
  • Est. Priority Date: 08/13/1990
  • Status: Expired due to Term
First Claim
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1. A system for controlling a plurality of devices located in a structure having existing power lines such that each device operates at either a first or second condition comprising:

  • a source of AC power located in said structure;

    encoder means remote from said devices responsive to said power source for generating a cyclical signal having a plurality of adjacent pulses in each cycle, at least one pulse in each cycle being missing;

    decoder means; and

    means for transmitting said pulse signal to said decoder means over said power lines, said decoder means decoding each cyclical pulse signal and generating a DC voltage having a first or second magnitude, a DC voltage of said first magnitude causing each of said devices to operate at said first condition, a DC voltage of said second magnitude causing each of said devices to operate at said second magnitude.

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