Matrix multi-path temperature detection circuit for small satellite platform

Abstract

The invention provides a matrix multi-path temperature detection circuit for a small satellite platform, comprising a matrix thermistor measurement network, an analog switch, a main backup analog / digital (A / D) conversion module and a main backup singlechip controlling and processing module, wherein the matrix thermistor measurement network completes voltage value collection of the terhmistor of each temperature monitor point in a satellite system; the analog switch is matched with the matrix thermistor measurement network to select the voltage of a particular temperature monitor point transmitted to the A / D conversion module; the A / D conversion module is used for carrying out the filtration, amplification and A / D conversion on a collected temperature voltage; and the singlechip controlling and processing module is used for setting and outputting an inspection control signal of the matrix thermistor network and the analog switch, converting the voltage output by the A / D conversion module into a temperature value, and managing communication with a controller area network (CAN) bus. By utilizing the temperature detection circuit, elements and devices required for temperature measurement of the satellite platform are reduced, the self-heating effect of the thermistor is reduced, the backup design is added simultaneously, and the reliability is improved.

Description

technical field [0001] The invention belongs to the field of aerospace electronics and relates to a temperature detection circuit for a small satellite platform. Background technique [0002] In the small satellite platform, the temperature detection circuit is the main component of the satellite thermal control subsystem. There are hundreds of locations in satellites where temperature monitoring is required, and the monitoring circuits currently used are mainly single-point detection circuits of thermistors. The single-point detection circuit mainly includes a power supply and a thermistor. The voltage change on the thermistor is measured by using the characteristics of the thermistor’s resistance value changing with temperature, and then the specific temperature value is obtained according to the relationship between the thermistor value and temperature. This detection method requires a lot of components, which leads to complicated wiring on the device and poor reliabilit...

AI Technical Summary

Problems solved by technology

This detection method requires a lot of components, which leads to complicated wiring on the device and poor reliability; the thermistor has a self-heating effect, and the thermistor of this single-point detection circuit is always in a working state, which will affect the measurement results ; Moreover, the thermistor that is in the working state for a long time will inevitably reduce its service life

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