Digital dimming and flashing circuit for locomotive ditch lights

Details Digital dimming and flashing circuit for locomotive ditch lights Digital dimming and flashing circuit for locomotive ditch lights

1993-06-25

1996-07-09

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Vehicle mounted systems

307 108, 315 77, 315322, 3404255, 340466, 340469, B60Q 126, B60Q 154

Patent

active

055347339

ABSTRACT:
A light is dimmed by pulsing it at a selected duty cycle. By pulsing, the light can be dimmed without being turned off completely which reduces wear on the filament. The circuit is designed for flashing a pair of ditch lights on a railroad locomotive. The lights are alternately illuminated at full voltage and dimmed by pulsing. The flashing sequence can be activated when the locomotive is travelling below a selected speed or when the horn is sounded. The duration of the flashing sequence is controlled by a timer. The pulsing circuit can be used to effectively reduce a voltage without voltage dropping resistors.

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