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在不少应用场合,需要多温度控制。我们在改造一批(单温度型)恒温箱的控制系统时,仅修改和更新了系统软件,即成功实现了多温度控制。 1.温度控制原理 基于单片机的温度控制原理为:被控温度θ经温度传感器获得模拟电压,再经过A/D转换,软件滤波和去误差,得到与之对应的数字信号,运算后得到温度值,温度值分两路,一路送显示,另一路与设定值比较,误差E送控制算法运算后得到控制脉冲T高电平T1的宽度,T1决定了晶闸管导通时间,从而控制了发热器
In many applications, multi-temperature control is required. When we rebuild a batch of (single temperature type) incubator control system, we only successfully modified and updated the system software to achieve multi-temperature control. 1. Temperature control principle Based on single-chip temperature control principle: controlled temperature θ by the temperature sensor to obtain analog voltage, and then after A / D conversion, software filtering and to error, get the corresponding digital signal, the calculated temperature , The temperature value in two ways, all the way to send the display, the other way with the set value comparison, the error E control algorithm to get the control pulse T high T1 width, T1 determines the thyristor conduction time, which controls the heater