Methods and apparatus for communicating current levels within a lighting apparatus incorporating a voltage converter
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United States of America Patent
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Sep 5, 2017
Grant Date -
Feb 25, 2016
app pub date -
Jul 20, 2015
filing date -
May 11, 2010
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Abstract
Circuits for sensing current levels within an apparatus are disclosed. In specific cases, a constant voltage power supply is used to power an LED lighting apparatus 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 by determining a voltage level across a known resistor and calculating the current level. To prevent the known resistor from causing a significant reduction in the efficiency of the overall light engine, the circuit includes one or more transistors in parallel with the known resistor to reduce the effective resistance in the LED circuit during times that the current is not being sensed.
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