Calorimeter's hardware circuit design
Abstract
This design introduced one kind of new calorimeter. this calorimeter is based on the MCS-51 monolithic integrated circuit. mainly by the flow sensor, the temperature sensor, the monolithic integrated circuit three parts is composed. The temperature signal measurement electric circuit is calorimeter's temperature measurement part, it by three end manostats (MC7806), the temperature sensor (Cu100), differentiator amplifier (AD620) and a/D switch (AD1674) is composed. Flow measurement's principle may divide into two kinds approximately, namely the direct measurement current capacity's way and asks the speed of flow to be multiplied by the plan area first through the speed of flow to ask ways again and so on current capacity. Monolithic integrated circuit MCS-51 composes primarily the basic module is this system's hard core, mainly completes the signal which gathers to the system to carry on related processing, is coordinated other modules, causes work which the overall system marches in step. Based on the above part, designs a set to use in measuring the thermal intelligent low power loss calorimeter system. Enables system's current consumption to achieve as far as possible is smallest, and the parameter can demonstrate through the LED nixietube. As soon as this design elaborated calorimeter's hardware and the software design in detail, the success design applies mechanically the MCS-51 control the intelligent calorimeter. This calorimeter is in inlays microprocessor's intellectualization measuring instrument, compares with the traditional mechanical measuring appliance has the structure simply, safe reliable, timeliness to be good, the sensitivity is high; The power loss is low, overall system's dynamic power loss only then about 50uA, about static power loss only luA, only then above people's good guarantee use battery power supply 5 years; Operates easily, the user may inquire all data and the information through a pressed key, and on LED demonstrated that the result is direct-viewing. Compares the cost with the traditional measuring appliance to reduce greatly, moreover the anti-jamming good, installs the maintenance to be convenient, the measuring accuracy is high, has the high performance/price ratio.
Keywords:; Calorimeter; Monolithic integrated circuit; Flowmeter; Temperature sensor; Flow senso
目 录
1绪 论 1
1.1 我国供热现状 1
1.2 发达国家热计量收费的概况 2
1.3 开发热量计的现实意义和应用前景 2
1.4 供热计量的合理方式 3
1.5 本设计研究内容和目标 4
2 热量计的硬件电路设计 5
2.1热量计量系统框图 5
2.2 热量计计热原理 6
2.3 热量计硬件原理框图 7
2.4 信号处理部分 8
2.4.1 单片机系统结构 8
2.4.2 单片机外围电路设计 10
2.5 温度信号测量 11
2.5.1 热量计测量部分 11
2.5.2 差动放大器 13
2.5.3 A/D转换器与89C51的连接图 14
2.5.4 温度测量电路 16
2.6 流量信号测量 16
2.6.1 流量的概念 16
2.6.2 流量测量原理 17
2.6.3 流量测量的设计 17
2.6.4 流量测量电路 19
2.7 显示部分设计 19
2.8 本章小结 20
3热量计软件设计 22
3.1 编程语言介绍 22
3.2初始化主程序 22
3.3 温度测量子程序流程设计 23
3.4流量测量子程序流程设计 23
3.5热量计量子程序流程设计 25
3.6按键子程序流程设计 26
3.7显示子程序流程设计 26
3.8 本章小结 27
结论 29
致 谢 30
参考文献 31
