电冰箱温度测控系统毕业设计论文说明书.doc

编号: 毕业设计说明书题目: 电冰箱温度测控系统设计题目类型:?理论研究?实验研究?工程设计?工程技术研究?软件开发 2012 年5月 20日桂林电子科技大学毕业设计(论文)报告用纸摘要随着电子技术、传感技术、计算机控制技术的发展以及对冰箱节能保鲜的要求,变频冰箱得到了快速发展。变频冰箱使用了变频压缩机,通过调节变频压缩机的转速,以此来控制制冷量,温度波动小,制冷效率高,节能明显。电冰箱温度测控系统设计采用单片机产生 PW M信号控制功率模块来实现电机的变频控制。具体是利用 DS18B20 温度传感器对周围的环境温度进行监测,获取的当前温度, 并输入到整个系统的核心部件—— AT89C51 单片机中,再与预先设定的温度相比较,单片机通过对信号加以判断,根据当前温度与预设的温度的温差来改变工作的频率,当现温度与预设温度相差较大时,工作频率较高,当现温度与预设温度相差较小时,工作频率较低,通过变频来达到节能的效果。同时系统还选用了 LCD1602 液晶屏来显示温度, 有较好的可视化效果。本次设计的电冰箱温度测控系统能够根据温度检测反馈的信号来调节工作频率,按键可调节预设温度的高低,当环境温度低于预设温度时,变频模块停止工作,当环境温度高于预设温度时,工作频率变高,电机转速变快。频率范围 30-150HZ 。温度变化差值以 1° 作为改变频率的界限,当环境温度高于预设温度 5° 以上时,则以最高的工作频率工作。本次设计能够通过改变电机转速,根据温度差值的变化而变化,从而减小频繁开停机损失、降低耗电量。关键词: 变频冰箱;DS18B20 传感器;AT89C51 单片机桂林电子科技大学毕业设计(论文)报告用纸 Abstract With electronic technology, sensor technology, the development puter control technology, and preservation of the refrigerator energy saving requirements, has been a rapid development in the inverter refrigerator. The use of variable pressor for inverter refrigerator, by regulating the speed of the pressor, in order to control the cooling capacity, temperature fluctuations, high efficiency refrigeration, energy saving is obvious. The refrigerator temperature control system design uses a microcontroller's PWM signal to control the power module to the motor inverter control. Specific DS18B20 temperature sensor monitoring the temperature of the surrounding environment, access to the current temperature, and entered into the heart of the ponents - AT89C51 microcontroller, and pared with pre-set temperature, the microcontroller through the signal tobe judged, change the frequency of work according to the temperature difference between the current temperature and the preset temperature, when the current temperature and preset temperature difference between the larger, higher operating frequency, when the current temperature and preset temperature difference between the smaller, lower operating frequency, by frequency to achieve the energy saving effe