Closed loop current control circuit and method thereof
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United States of America Patent
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Sep 28, 2004
Grant Date -
Feb 26, 2004
app pub date -
Aug 21, 2002
filing date -
Aug 21, 2002
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A circuit and method for providing closed loop control using constant current switching techniques is disclosed herein. By controlling the current supplied to high intensity light emitting diodes (LEDs) using the techniques and circuits described, high intensity LEDs can be operated at or near their maximum capacity without danger of overloading the LEDs, and without using excess amounts of current. A circuit as described herein, has multiple high side switches, each of which is connected to an LED array. The LED arrays are in turn connected through an inductor to a current switching control section that switches current to ground, or recirculates the current to maintain LED current flow within a desired range.
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