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Conservation traffic control load switch

  • US 5,612,596 A
  • Filed: 10/16/1995
  • Issued: 03/18/1997
  • Est. Priority Date: 10/16/1995
  • Status: Expired due to Fees
First Claim
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1. In a lamp switching circuit of a variety having a switching thyristor responsive to an actuating input to supply current from an a.c. source to an incandescent lamp, said a.c. source exhibiting a given voltage level and positive and negative going half cycle characteristics, to an incandescent lamp, said actuating input being derived at a solid state bilateral switch, in turn, having an actuating component responsive to first and second logic control conditions to respectively effect derivation of said actuating input and removal of said actuating input, the conservation circuit comprising:

  • a solid state shunt switch coupled in shunting relationship across said actuating component, having an on condition applying a shunt across said actuation component removing said actuating input in response to a cycle modulation on condition and having an off condition preventing said shunt across said actuation component in the presence of a cycle modulation off condition;

    a logic control monitor network responsive to said first logic control condition to provide a lamp on condition;

    a cycle state monitor network responsive to said a.c. source to derive a cycle state signal corresponding with the instantaneous wave shape defining amplitude of each said half cycle; and

    a processor responsive, when activated from an inactive to an active state, to the commencement of said lamp on condition of said logic control monitor network, and to said cycle state signal to generate said cycle modulation on condition for a predetermined soft start interval effecting a soft start characterized energization of said incandescent lamp.

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