Breathing machine voltage regulating system and control method

Abstract

The invention discloses a breathing machine voltage regulating system and a control method. The method comprises the following steps that an arithmetic system receives input voltage, a pressure sensor collects output pressure of a turbofan and feeds data back to the arithmetic system, the arithmetic system performs arithmetic treatment and then outputs motor control voltage to a control system, and the control system controls the rotation speed of the turbofan according to the motor control voltage to control the output pressure of the turbofan. According to the breathing machine voltage regulating system and the control method, the air pressure output by the turbofan is adopted as closed-loop control of feedback, similar integral windup controlled by PID cannot be generated, a motor is rapid in response, the response time of a breathing machine is significantly shortened, and the comfortableness of the breathing machine is significantly improved.

Description

technical field [0001] The invention belongs to the field of medical devices, in particular to a pressure regulating system and a control method for a ventilator. Background technique [0002] In modern clinical medicine, ventilator, as an effective means to artificially replace the function of spontaneous ventilation, has been widely used in respiratory failure caused by various reasons, anesthesia and respiratory management during major surgery, respiratory support treatment and emergency resuscitation. It occupies a very important position in the field of modern medicine. A ventilator is a vital medical device that can prevent and treat respiratory failure, reduce complications, and save and prolong patients' lives. [0003] A ventilator is a medical device for the purpose of outputting air at a certain pressure or flow rate to assist patients with respiratory insufficiency or unable to breathe spontaneously due to special circumstances. The turbo blower powered by the ...

AI Technical Summary

Problems solved by technology

The software PID control technology is a kind of closed-loop control, usually with the speed of the turbo fan, the output air pressure or flow as the negative feedback, however, due to the characteristics of the motor's rotational inertia and the elasticity of the air, there is a long delay in the output of the feedback signal, It is easy to cause the accumulation of PID integral items, which will cause the motor speed to oscillate and affect the stability of the output. If the sampling frequency of PID is reduced, it will affect the response time of the motor system and affect the comfort of the patient.

Disadvantages of using PID control technology: 1. The delay of the output feedback of the turbo blower causes the PID algorithm to easily generate pressure and flow rate fluctuations, thereby reducing the comfort of the ventilator; 2. The application software PID algorithm takes up relatively high system resources Used for data acquisition and calculation, and affected by A / D conversion, the error rate is high, the stability is poor, and the response speed is slow

Therefore, the patent still uses the PID algorithm to realize the adjustment of the ventilator pressure, and still does not get rid of the above-mentioned defects of the PID algorithm

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