Drive circuit for a solar lamp with automatic electrical control of the lamp operating conditions
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United States of America Patent
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Jun 24, 1997
Issued Date -
N/A
app pub date -
Jul 26, 1995
filing date -
May 30, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A solar lamp drive circuit is arranged to delay start-up while a current is supplied to the lamp filament to warm up the filament. During operation, the back e.m.f. induced in the lamp is sampled, and, if operating conditions deteriorate, the current to the filament is reapplied automatically and the power supply to the lamp increased.
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