Most patients who use a positive pressure sleep ventilator use it during sleep, so the ventilation comfort and silence performance of the ventilator are important indicators. In addition, one of the functions of a sleep ventilator is to promptly detect and take appropriate protective measures in case of system abnormalities, and its core point is the control of the ventilator fan.

The hardware design of this positive pressure sleep ventilator has three important features. The first covers the extremely dynamic motor speed range: in dual horizontal mode, the motor speed range will quickly switch between 10000rpm and above 25000rpm, and the speed switching time can be less than 0.5 seconds. The second is to maintain as little noise as possible. When the pressure of the ventilator is 10cm water column, it is generally required to be less than 30dB, and high-end products can achieve 23dB or less. The third feature is a flexible and convenient system diagnosis and protection mechanism: to conveniently combine driver information and relevant sensors to locate related abnormal events, including respiratory mask detachment, respiratory pipeline leakage, fan blockage, and so on.

The household positive pressure sleep ventilator requires a compact size and minimal operating noise, so the motor control needs to use FOC algorithm to control the stable operation of the fan based on the load (system pressure and flow conditions), reduce torque pulsation, and greatly reduce the operating noise of the motor itself. Usually, engineers choose to directly purchase the drive board for the fan during product development, which is relatively expensive and the interface control is not flexible enough. Shen Gong's solution can achieve better performance and flexibility at a lower cost.




The hardware design scheme of the positive pressure sleep ventilator uses a combination of TMC4671 and TMC6200, greatly reducing the threshold for high-performance motor driver design, allowing users to quickly build related high-performance motor applications without the need to write complex and time-consuming underlying drivers, saving a large amount of debugging time; Relevant diagnostic functions enable engineers to quickly locate system faults during the early stages of debugging; With TMC IDE, users can easily carry out system identification and control parameter optimization to accelerate product design finalization; Users can focus on the design optimization of the product itself, which is the direction of future motor control applications.