Method and device for supplying power to LEDs
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United States of America Patent
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Jan 20, 2009
Grant Date -
Oct 19, 2006
app pub date -
Jun 28, 2004
filing date -
Jul 16, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
The invention relates to a device for lighting at least one light emitting diode to be supplied with predefined minimum forward voltage and maximum current. It comprises: —voltage supply means for supplying voltage to the light emitting diode, —a pulse generator for generating a cyclic pulse signal having predefined on-times and off-times, —a switch, controlled by the pulse generator to be turned on during said on-times to short-circuit the light emitting diode and turned off during said off-times, —an inductive device for increasing the forward voltage over the light emitting diode when the switch is turned off, so that said forward voltage gets higher that the minimum forward voltage and for decreasing said forward voltage when the switch is turned on, so that the current through the light emitting diode remains below the maximum current.
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