Switch-mode oximeter LED drive with a single inductor
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United States of America Patent
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Jun 5, 2012
Grant Date -
Nov 23, 2006
app pub date -
Jul 26, 2006
filing date -
Feb 25, 2004
priority date (Note) -
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Abstract
A light emitter drive circuit for an oximeter which utilizes a single inductor for driving multiple light emitters. The inductor is connected to a switching circuit to multiple energy storage circuits, such as capacitors. These are alternately charged up, using the same inductor. Subsequently, the capacitors are alternatively discharged for their corresponding light emitters through the same inductor. Also, the magnetic susceptibility of the LED drive circuit is reduced by using magnetic flux canceling in the inductor. In one embodiment, a toroidal inductor is used with geometric symmetry and its magnetic flux. In other embodiment, a dual core closed bobbin shielded inductor is used.
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