Solar powered lamp having a circuit for providing positive turn-on at low light levels
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United States of America Patent
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Apr 20, 1993
Grant Date -
N/A
app pub date -
Jul 17, 1991
filing date -
Jul 17, 1991
priority date (Note) -
Expired
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Abstract
A solar powered lamp having a circuit for providing positive turn-on at low light levels causes a light source thereof to undergo a discrete transition to an 'on' condition and prevents unnecessary drain on a battery thereof. The circuit comprises a positive feedback loop which amplifies current flow rapidly to a predetermined level at which the light source is illuminated. In doing so, it causes a plurality of solar powered lamps to illuminate at substantially the same time.
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