Patent ID: 8677995

Claim:
A portable ventilator apparatus comprising: a compressor disposed within the portable ventilator; a brushless direct current (BLDC) motor, said compressor driven by said BLDC motor; a plurality of sensors disposed within the portable ventilator that provide a plurality of analog signals, said plurality of analog signals representative of an angular position of said BLDC motor; a computation circuit disposed within the portable ventilator and in communication with the plurality of sensors configured to compute said angular position or an angular speed of said BLDC motor from said plurality of analog signals; and a speed control servo disposed within the portable ventilator and in communication with said BLDC motor for driving said angular speed of the BLDC motor to a command speed provided to said computation circuit; an analog to digital converter directly coupled with said plurality of sensors that directly receives the analog signals provided by said plurality of sensors, and that converts the analog signals to digital signals, and that outputs the digital signals; a processor that receives the digital signals, that generates control signals based on the digital signals, and that provides the control signals to a three phase inverter that generates drive signals to control said BLDC motor.