Switching converter for lighting with light intensity as feedback and light emitting apparatus using the same
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United States of America Patent
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Jun 21, 2011
Grant Date -
Apr 22, 2010
app pub date -
Oct 16, 2008
filing date -
Oct 16, 2008
priority date (Note) -
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Abstract
A light emitting apparatus comprises a light emitting element and a switching converter comprising a conversion circuit for converting an operating electric signal to generate the driving electric signal, a feedback circuit having a light detecting element for detecting a luminous intensity of the light emitting element and generating a feedback signal, and a control circuit for receiving the feedback signal, comparing the received feedback signal with a reference electric signal, and controlling the conversion circuit based on comparison results to adjust the driving electric signal. Alternatively, the light detecting element detects ambient light and the control circuit controls the conversion circuit based on comparison results to stop or enable outputting of the driving electric signal.
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