基于模拟负载的制冷机控制器测试系统设计

Design of Test System for Refrigerator Controller Based on Simulated Load

摘要: 针对传统旋转式制冷机控制器测试中斯特林制冷机负载成本高昂、测试效率低等问题，本文提出一种基于模拟负载的制冷机控制器闭环测试方法。通过模拟负载装置替代斯特林制冷机，构建制冷机控制器的测试系统，模拟斯特林制冷机的电机动态性能，完成制冷机控制器的闭环控温测试。模拟负载采用单片机生成霍尔信号至制冷机控制器，控制器输出电机驱动信号至模拟负载，通过模拟负载中的模数转换器实时采集电机驱动信号占空比及频率，结合数模转换器模拟制冷机二极管两端电压，形成测试系统的闭环验证。实验表明，本文所提出的基于模拟负载的控制器测试方法有效地满足了控制器的测试需求，降低了控制器的测试成本，实现了系统的快速闭环验证，为制冷机控制器的测试与验证提供了一种可靠、经济的解决方案。

Abstract: Aiming at the problems of high load cost and low test efficiency of stirling refrigerator in the traditional test of rotary refrigerator controller, a closed-loop test method of refrigerator controller based on simulated load is proposed in this paper. The test system of refrigerator controller is constructed by simulating the load device instead of stirling refrigerator, simulating the dynamic performance of stirling refrigerator motor, and completing the closed-loop temperature control test of refrigerator controller. The analog load uses a single chip microcomputer to generate hall signal to the refrigerator controller, and the controller outputs the motor driving signal to the analog load. The duty ratio and frequency of the motor driving signal are collected in real time through the analog-to-digital converter in the analog load, and the voltage across the diode of the refrigerator is simulated by combining the digital-to-analog converter to form a closed-loop verification of the test system. Experiments show that the controller testing method based on simulated load proposed in this paper effectively meets the testing requirements of the controller, reduces the testing cost of the controller, realizes the fast closed-loop verification of the system, and provides a reliable and economical solution for the testing and verification of the refrigerator controller.