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Chen Xue-fang Computer school, Dongguan university of Technology, Dongguan, China e-mail: chenxf@dgut.edu.cn Abstract: To provide patients with a comfortable and healthy breathing environment, a heated humidification system for respirator is designed by PID (Proportional, Integral and Differential) algorithm and silicon controlled rectifier (SCR). Zero-crossing detection method is also introduced, and its circuit is also designed to realize PID algorithm. The testing experiment was established, temperature stability of the system was tested. Result shows that the system is responsive for stable temperature control, and easy to transplant.

The heated humidification system for respirator based on PID