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Occupancy sensor and method of operating same

DC
  • US 6,078,253 A
  • Filed: 10/15/1997
  • Issued: 06/20/2000
  • Est. Priority Date: 02/04/1997
  • Status: Expired due to Term
First Claim
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1. An occupancy based load controller, comprising:

  • at least one occupancy sensor for producing at least one occupancy estimator signal indicative of motion within a space;

    a programmable microprocessor, connected to said at least one occupancy sensor, for calculating an occupancy signal from said at least one occupancy estimator signal, for comparing said occupancy signal to an activation threshold, and for adjusting a sensitivity of said at least one occupancy sensor as a function of time-varying noise that corrupts said at least one occupancy estimator signal when said electrical load is de-energized; and

    a controllable load energizing device responsive to said programmable microprocessor, operable to automatically energize an electrical load when said microprocessor determines that said occupancy signal is greater than said activation threshold.

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