DRIVER CIRCUIT
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United States of America Patent
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Issued Date -
Aug 23, 2018
app pub date -
Aug 30, 2016
filing date -
Sep 14, 2015
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Abstract
The invention describes a pulse oximeter driver circuit (1) realized to drive a load (12) comprising at least a red LED light source (SR) and an infrared LED light source (SIR), which driver circuit (1) comprises a current regulator (11) realized to provide LED current (Iload) to the LED light sources (SR, SIR); a power converter (10) realized to provide a DC output voltage (Utotal) comprising a current regulator voltage (U11) and a load voltage (Uload); and a feedback means (13A, 13B, 13C) realized to obtain a measure (UFB) of the instantaneous voltage drop (U11) across the current regulator (11) and to report the voltage drop measure (UFB) to the power converter (10). The invention further describes a pulse oximeter device (100), and a method of driving a pulse oximeter load (12).
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