Temperature detection method for fitting RTD characteristics by using NTC thermistor

Abstract

The invention belongs to the technical field of aviation electrical design, and particularly relates to a temperature detection method for fitting RTD characteristics by using an NTC thermistor. The method comprises the steps of: determining the maximum resistance value of an NTC thermistor according to the temperature detection range of aviation airborne equipment; determining the resistance value of an additional resistor connected with the NTC thermistor in parallel according to the maximum resistance value which can be detected by the RTD temperature sensor; according to a sampling temperature formula of the RTD temperature sensor and the corresponding relation of the resistance of the RTD temperature sensor along with the temperature, determining the corresponding relation between the temperature obtained after the NTC thermistor and the additional resistor are connected in parallel and sampling data; acquiring sampling data; and calculating the temperature of the corresponding sampled equipment according to the sampling data. The temperature of equipment such as a transformer rectifier and a storage battery can be effectively monitored, safe operation of the equipment is guaranteed, and fault detection and prediction of an aviation power supply system are facilitated.

Description

technical field [0001] The application belongs to the technical field of aviation electrical design, and in particular relates to a temperature detection method using an NTC thermistor to fit RTD characteristics. Background technique [0002] With the increase of aircraft power supply capacity, the proportion of high-power electrical equipment in the aircraft power supply system is increasing, and its working process is often accompanied by high current and high temperature. These factors affect the safety and reliability of power supply. Therefore, it is necessary to Set corresponding fault detection and diagnosis measures to ensure that aviation power supply equipment (such as transformer rectifiers, batteries, etc.) work within a controllable range. [0003] In the aircraft power supply system, when the local temperature of a certain equipment or component is too high, it will lead to the decline of the mechanical strength and physical properties of electrical materials, ...

AI Technical Summary

Problems solved by technology

[0003] In the aircraft power supply system, when the local temperature of a certain device or component is too high, it will lead to the decline of the mechanical strength and physical properties of the electrical material, causing problems such as cable aging and reduced service life of electrical equipment, and even fire in severe cases.

Images