Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1980-07-23
1982-11-23
Zazworsky, John
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307252W, 315199, H03K 1772
Patent
active
043607438
ABSTRACT:
A solid state control device is disclosed for gradually controlling the turn on and turn off of a light bulb. The light bulb is connected to an AC power source through a full wave rectifier having a semiconductor switching circuit connected across it which short circuits the full wave rectifier when an SCR or triac in the semiconductor switching circuit is turned on. A capacitor is normally charged to turn off the SCR or triac when a mechanical on/off switch forming part of the semiconductor switching circuit is in the off position. Upon turning the switch to the on position, the capacitor is discharged to slowly turn on the triac or SCR to short circuit the full wave rectifier and actuate the light bulb. These same circuit components are used when the switch is turned to the timed off position to slowly turn the triac or SCR off which thereby slowly turns off the light bulb. Essentially, this semiconductor switching circuit is comprised of a resistor-capacitor network which is actuated by either a mechanical switch or by the gate current leakage of the triac or SCR itself. The gradual charging or discharging action of this circuit changes the firing or conduction angle of the triac or SCR to accomplish both gradual turn on and turn off of the light bulb to thereby increase bulb life.
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