【作者】 温文龙；

【导师】 齐长远；

【作者基本信息】 西北大学 ， 电路与系统， 2005， 硕士

【摘要】 随着智能仪器仪表不断的小型化、轻量化,密封仪器仪表的热流密度以指数比例迅速增长,大量热量聚集在密封仪表内部将直接影响仪表的可靠性,合理有效的散热方法才能从根本上解决这些问题。 本文结合航海、航空及航天等军事应用领域内密封仪器仪表的特点,对几种应用在密封仪器仪表上的散热方法进行了分析比较,提出以半导体制冷技术与冷板技术相结合的混合散热方法;并以单总线数字温度传感器作为温度测量单元,以半导体制冷器作为执行单元,使用单片机作为主控制器设计了温度模糊控制系统。该系统采用脉宽调制(PWM)的功率控制方式。经过对系统的试验设计测试,证明半导体制冷器结合冷板的散热方法可以有效地解决密封仪器仪表对散热的特殊要求,实现了散热静音化,提高了系统的可靠性,延长了密封仪器仪表的使用寿命。单总线数字温度传感器抗干扰能力强、接口简单,从而提高了系统的测控精度。模糊控制理论的应用使该温度控制系统具有较好的稳定性。更多还原

【Abstract】 In view of the rapid increase in the miniaturization, lightweight of intelligent instrument. Increased heat fluxes pose a major cooling challenge in electronic instrument enclosure. Amount of heat accumulation directly influences the reliability of the instrument. To meet the challenge significant cooling technology enhancements will be needed.This article firstly analyzes and compares different kinds of heat transfer technologies of present applications in sealed electronic instrument. Considering special requirement of electronic enclosures in nautical and aeronautic application areas. Peltier cooling technology mixed up with cold plate technology is presented. Also, 1-wire digital thermometer as temperature probe, a microprocessor based fuzzy temperature control system is designed. The system adopts Pulse Width Modulation (PWM) as power control method. Experimental results indicate that the special heat dissipation needs of sealed instrument are satisfied. Furthermore interference-free feature and measurement control performance have been enhanced by using digital temperature sensor together with fuzzy control theory. In conclusion, the system poses advantages of no noise、 high reliability and long life.更多还原