Digital dimming and flashing circuit for locomotive ditch lights
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United States of America Patent
Stats
-
Jul 8, 1997
Issued Date -
N/A
app pub date -
Aug 2, 1994
filing date -
Jun 25, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
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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Cited Art Landscape
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