Refrigeration Control System of Star Sensor Detector Based on FPGA

A star sensor detector is used to obtain accurate star images to calculate high-precision position, attitude and other information. When the star sensor is in orbit, it needs to control the working temperature of the detector to make its working performance stable and reliable. The paper presents a star sensor refrigeration control system based on FPGA. The system uses a piecewise digital PID control algorithm to generate the PWM wave to drive the semiconductor cooler for high precision refrigeration, which has a simple structure of the circuit and high reliability. The experimental results show that the system has the characteristics of quick cooling response, small overshoot and high temperature control precision which can reach ±0.25℃.

This article proposes an FPGA based refrigeration control system for star sensor detectors, which uses a segmented PID control algorithm to generate PWM waves and control the semiconductor cooler to cool the detector. Through experimental verification, this refrigeration control system has the characteristics of fast refrigeration response, small overshoot, and high temperature control accuracy. It can accurately and reliably stabilize the detector at the appropriate working temperature, ensuring its working performance.