【作者】 邓朝霞；

【导师】 黄洪全；

【作者基本信息】 广西大学 ， 控制理论与控制工程， 2006， 硕士

【摘要】 回流焊接是SMT工艺流程中重要的一环，回流焊炉的作用是提供一定的温度环境使焊锡膏熔化、而后降温固化在PCB上形成焊点。无铅焊锡膏对温度精度的要求较高，本文主要研究了无铅回流焊炉中使用的温度控制器，来满足广西机电工程学校开设介绍SMT技术的课程的需要。 论文首先分析了回流焊炉的工作原理，根据控制要求设计了以单片机89S51作为核心控制器的硬件系统，采用PT100作为温度采样器件，将温度采样后经过A／D转换送入单片机，由单片机作出控制决策，将控制量送到执行器件固态继电器TSS16J41S，由固态继电器来控制电阻丝的发热功率。 论文的控制算法是模糊控制，首先分析了无铅焊锡膏的温度要求，通过实验测定传感器和炉体的动态参数。根据温度要求给出模糊控制器的模型、定义控制器输入输出量的论域和模糊子集，给出输入输出量的隶属函数。然后，根据控温要求给出控制决策，算出控制表。 最后，论文通过分析系统实测温度曲线，调整模糊控制算法中的各个参数，以调整控制的结果的精度。更多还原

【Abstract】 Reflow soldering is a key chain in the SMT ,the function of the reflow soldering stove is to provide a requested-temperature condition on which the solders is melt and then cooling and becomes solid to form a soldering drop. The leadfree solders has a strict request to the temperature of the soldering environment, the text mostly study the fuccy controller of the leadfree reflow soldering. Guangxi mechanical and electrical technology school is going to develop a new course named SMT, therefore a reflow soldering stove controller will need to be work out, which will be uesed for experimentThe text initially analyses the working principle of the reflow soldering, according the requested-temperature , a hardware system is designed, which core is a microcomputer 89s51.A PT100 is used to collect the temperature of the reflow soldering stove ,and then the data is passed on to the microcomputer by the ADC.A control order is given to the execute equipment SSR TSS16J41Swhich controls the heating efficacy of a heater.The text uses the fuccy math as the control method. Firstly the text更多还原