CONTROL CIRCUIT FOR CLOCKED CONTROL OF AT LEAST ONE LIGHT EMITTING DIODE
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United States of America Patent
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N/A
Issued Date -
Aug 28, 2008
app pub date -
Feb 22, 2008
filing date -
Feb 24, 2007
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A control circuit includes a clock pulse generator operable to output a pulse-frequency ratio to a constant voltage source in order to control the power output of the constant voltage source. The control circuit further includes a driver circuit for the clocked control of at least one light emitting diode (LED) to which a measurement resistor is connected in parallel. The LED is supplied with power by the constant voltage source. The LED is turned on when the power is greater than a forward power level and is turned off when the power is less than the forward power level. The driver circuit taps a measurement voltage of the measurement resistor while the LED is supplied with power less than the forward power level. The clock pulse generator varies the pulse-frequency ratio as a function of the measurement voltage of the measurement resistor.
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