基于LPC2132的多通道温度控制器设计

Design of Multi-channel Temperature Controller Based on LPC2132

摘要:

针对众多工业设备需要同步控制数量较多加热设备的需求,给出了一种基于ARM处理器的多通道温度控制器设计方案;各通道温度传感器信号经由模拟选择开关分时选用后送至仪表运放AD620放大,再由AD芯片AD7705转换成数字信号后传送给ARM处理器LPC2132进行处理转换成实际温度;结合期望的目标温度,利用积分分离PID算法计算输出控制量并以PWM方式驱动固态继电器调节加热器件在控制周期内通电时间的占空比；实验结果表明温度控制器的测温一致性和温控性能均能得到有效提升。

Abstract:

For the requirement of synchronous control of multiple heater in many industrial facilities, a design of multiple channel temperature controller based on ARM processor is introduced. Signals of temperature sensor from each channel are selected separately by analog switch and sent to instrumentation amplifier AD620. Amplified signals are transferred by AD chip AD7705 to digital signals which can be proceeded by ARM processor LPC2132. Combining the desired temperature, the output control variable which is obtained by using integral separated PID algorithm, is introduced to adjusting the duty ratio of powering time for heater. Results of the trail indicated that the consistency of temperature measurement and control performance can be promoted obviously.