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DIMMER UNIT FOR A LIGHTING CONTROL SYSTEM

  • US 3,733,528 A
  • Filed: 08/02/1971
  • Issued: 05/15/1973
  • Est. Priority Date: 08/02/1971
  • Status: Expired due to Term
First Claim
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1. A dimmer unit for use in a lighting control system and comprising:

  • circuit means for supplying an alternating-current voltage;

    circuit means for supplying a direct-current control voltage;

    switching circuit means adapted to be coupled in series between the alternating-current supply circuit means and a lamp load for enabling current flow to the lamp load when such switching circuit means is conductive;

    a timing capacitor;

    a trigger device coupled to the timing capacitor for discharging same and supplying a trigger pulse to the switching circuit means when the charge on the timing capacitor exceeds a predetermined threshold level; and

    controllable charging circuit means responsive to the direct-current control voltage for charging the timing capacitor at a rate dependent on the magnitude of such direct-current control voltage.

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