Method for improving loop heating control precision and reliability by 1wire temperature sensor

Abstract

A method for increasing the precision and reliability of heating control of anesthesia apparatus loop comprises the following steps: inserting a 1wire temperature sensor in the anesthesia apparatus loop, and connecting the 1wire temperature sensor to a control unit; reading ID and checking code of temperature sensor by the control unit according to 1wire protocol, and confirming the validity of temperature sensor; reading the temperature value of temperature sensor by control unit, comparing with control target temperature, and switching on the control switch when heating is required according to the control algorithm, and providing electricity to the heater by power source and the loop temperature increases; contrarily switching off the control switch for reducing the loop temperature, control the average power of heater through a PWM mode and operating the loop in a preset control temperature. The 1wire temperature sensor is used for overcoming the transmission error of analogue signal, facilitating the insertion of sensor and realizing the long-distance temperature detection and control. The digital signal form and interface protocol of sensor have better interference resistance and failure recognition function, reduce the requirement to the connection quality of interface and increases the reliability.

Description

technical field [0001] The invention relates to a method for improving the accuracy and reliability of anesthesia machine circuit heating control, which can be applied to the heating control of related equipment in medical diagnosis, especially the temperature monitoring and control of the circuit heating part in anesthesia machines and ventilators. Background technique [0002] At present, the technical solution usually adopted for the heating of the anesthesia machine loop is open-loop control or analog signal closed-loop control, usually by using a heating element with a certain positive temperature coefficient, such as PTC for heating, and the heating power is automatically reduced as the temperature rises. Thereby reaching a certain heating temperature. The disadvantage of this technical solution is low control precision and poor reliability. The temperature accuracy of this heating element is not high, usually only up to ± 5 ℃. Analog signal closed-loop control usual...

AI Technical Summary

Problems solved by technology

The disadvantage of this technical solution is low control accuracy and poor reliability.

The temperature accuracy of this heating element is not high, usually only up to ±5°C

Analog signal closed-loop control usually uses temperature-sensitive components, such as thermistors, for temperature monitoring and control. This solution has high precision, but the disadvantage is that the circuit has poor anti-interference ability and has high requirements for signal connection quality. Line compensation needs to be considered , the control circuit itself is also easily affected by temperature, the reliability is poor, the failure of the sensor is not easy to judge, and it is easy to cause overheating

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