Methods and apparatus for causing LEDs to generate light output comprising a modulated signal
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United States of America Patent
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Nov 29, 2016
Grant Date -
Nov 12, 2015
app pub date -
Jul 20, 2015
filing date -
May 11, 2010
priority date (Note) -
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Abstract
Methods and apparatus for changing a DC supply voltage applied to a lighting circuit are disclosed. In specific cases, a constant voltage power supply is used to power an LED lighting circuit in which there are uncertainties within the forward voltages of the LEDs, which in turn creates uncertainty with respect to the current level flowing through the LEDs. To manage these uncertainties, the current flowing through the LEDs is measured and an indication of the current level is communicated to a person who can manually adjust the DC voltage supply applied to the LED lighting apparatus by the constant voltage power supply. Alternatively, an automatic adjustment of the DC voltage supply applied to the LED lighting apparatus by the constant voltage power supply can be performed based upon the measured current level.
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