隔离型热电阻温度调理模块适用于复杂的工业环境.传统的隔离型模块基于普通数字隔离技术，需要使用集成数模转换(DAC)芯片，原理复杂，且需要程序进行逻辑控制，存在成本高、体积大等问题.对此，设计了一种基于脉宽调制(PWM)隔离技术的热电阻温度调理模块，将采集的温度调理为4～20mA电流输出，供电电源、输入通道、输出通道相互隔离.该模块具有量程可配、精度高、成本低的特点，可将体积缩小40%，适用于核电厂数字化控制系统(DCS)对现场温度数据的采集与调理.
Isolated thermal resistance temperature conditioning module is suitable for complex industrial environment. The traditional isolation module is based on common digital isolation technology, and it needs to use integrated digital-to-analog conversion (DAC) chip, which is complex in principle and requires logic control by program. The module designed by this architecture has high cost, large volume and so on. An isolated thermal resistance temperature conditioning module based on pulse width modulation (PWM) technology was designed and adjusted the collected temperature into 4—20mA output current. The power supply, input channel and output channel of the module were isolated from each other. This module has the characteristics of configurable range, high precision and low cost, and can reduce the volume of the module by 40%. It is suitable for the temperature acquisition and adjustment of nuclear power digital control system (DCS).
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