微型及小型反应装置是石油化工生产和科研中常用的实险设备,加热炉等电加热部件是系统的关键设备,其控制质量的优劣标志着整个装置的质量,目前都采用微机控制。电加热器是具有较大滞后的控制对象。因此,完全可以用一个周期等于采样周期T_S,其宽度T_P可调的TTL电平脉冲量去控制固态继电器的通断,同时不必采用工频同步技术,即可实现对电加热器的温度控制。其中,T_P与T_S之比就是控制量输出的百分比值。因此,笔者采用了这个方案。该方案利用定时器产生一个基准频率f_0,作为脉冲形成器的基准时钟, Micro and small reaction devices are petrochemical production and scientific research commonly used real-risk equipment, heating and other electric heating components are the key equipment of the system, the quality of its control of the quality of the device marks the entire device are currently using computer control. Electric heaters are control objects with a large hysteresis. Therefore, a cycle can be equal to the sampling period T_S, the width of the T_P adjustable pulse TTL level to control the solid state relay off, without the use of frequency synchronization technology, you can achieve the temperature control of the electric heater. Among them, T_P and T_S ratio is the percentage of control output. Therefore, I used this program. The program uses a timer to generate a reference frequency f_0, as a reference pulse generator pulse,