LED forward voltage estimation in pulse oximeter
US7120480B2 · kind B2 · utility
11Cited by
17References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 25, 2004 |
| Grant date | Oct 10, 2006 |
| Priority date | — |
| Expiry date | Mar 22, 2025 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/1495
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An apparatus and method for determining if a forward voltage of an LED in a pulse oximeter is within a predetermined range. This is accomplished by measuring the current through the LED, and also by knowing the duty cycle of the pulse width modulator (PWM) drive signal to the LED.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.