Circuit for driving light-emitting diodes
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United States of America Patent
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Apr 20, 2004
Grant Date -
Feb 7, 2002
app pub date -
Jan 16, 2001
filing date -
Jan 14, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A circuit efficiently drives light emitting diodes (LEDs). The circuit uses a switching regulator device instead of a standard resistor to limit current to the LEDs. The switching regulator device is in a closed loop with a current sensing device near the LED lamps. Feedback from this current sensing device switches the control method according to the current load regulating the voltage applied to the LEDs. An inductive storage device in the circuit allows the LEDs to be driven with minimal voltage input. Methods for intensifying and focusing the light produced by the LEDs driven by the circuit are also described.
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