Featured Medical Applications - CPAP Machine

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CPAP stands for " Continuous Positive Airway Pressure ." The CPAP is a very beneficial treatment for those with sleep apnea, which is a medical condition where the airway closes off when an affected individual is in a relaxed or sleep state. CPAP therapy holds the airway open so that uninterrupted breathing is maintained and a restful night’s sleep is achieved.

For the most effective results, the CPAP machine must be used nightly and, because the mask rests on the face, comfort is a vital concern. Advanced CPAP setups include humidifiers, heated hoses, and software. Design considerations include:

A high-speed, low-power, highly-integrated microprocessor

Pressure sensors that convert readings into a differential signal to help the microprocessor regulate the airflow output, preferably with signal conditioning amplifiers that have low offset voltage and low drift over time and temperature.
Control of the DC motor by monitoring at least two of the three current phases, as well as the DC bus voltage feeding the motor drive bridge.

CPAP Machine Block Diagram