Systems and methods for low power pulse oximetery
AssigneeGeneral Electric Company
InventorsSakari Matias Lamminmaki, Kari Piipponen
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Abstract
Methods and systems are provided for a light-emitting diode (LED) drive circuit of an optical probe. As an example, a method for an optical probe including an LED in an LED drive circuit comprises reducing power consumption of the LED drive circuit by adjusting a drive voltage of the LED drive circuit based on one or more LED drive circuit characteristics and one or more LED drive circuit operating parameters. In this way, the LED drive circuit may be efficiently operated.
Claims14
A method for an optical probe including a light emitting diode (LED) in an LED drive circuit, comprising:
- reducing power consumption of the LED drive circuit by adjusting drive voltage of the LED drive circuit based on one or more LED drive circuit characteristics and one or more LED drive circuit operating parameters.
A method for an optical probe including a light emitting diode (LED) driven by a drive circuit including a voltage regulator and a LED current regulator, the method comprising:
- setting an LED current regulator reference voltage to an initial value;
- with the LED current regulator reference voltage at the initial value, measuring probe output signal characteristics;
- adjusting the LED current regulator reference voltage based on the probe output signal characteristics;
- and
- adjusting the LED drive voltage according to the LED current regulator reference voltage.
A system for an optical probe, comprising:
- a light emitter;
- a light detector configured to measure transmission and/or reflectance of light emitted by the light emitter through blood of a patient and output a light signal to a control unit;
- and
- a drive circuit configured to control the light emitter, the drive circuit comprising:
- a switching voltage regulator;
- a bulk capacitor coupled to the switching voltage regulator and to the light emitter;
- and
- a control unit configured turn off or decouple the switching voltage regulator during each light transmission pulse of the light emitter.
Dependencies are inferred from the claim text.