隔离工业接口时,需要区分过程控制和工厂自动化应用。这是因为两者之间的差别会影响
到数字接口设计的隔离工作。过程控制一般涉及到检测某些设备、系统或过程的不同物理量
(如压力“与”温度)。每一个物理量都用--特定类型的传感器或变换器,其输出信号需要特定
的信号调理。因此,多种不同的传感器需要不同的参数设置,如内部增益、采样率、测量重复
性、以及阻抗缓冲。支持宽范围设置的ADC提供有多个接口控制线,除标准串行接口线要求
隔离之外,所有这些控制线也都要求隔离。
图4中,许多不同灵敏度(mV/K)的传感器测量不同的过程参数,如温度、压力和电流。要
求有多种增益设置来使各传感器的ADC的输入动态范围最大化。如果期望-一个或多个通道输
入变化能比别的通道快,可能就要求采样率(速度)之间有切换。降低功率功能用来节省测量
后的功耗,此功能可使控制器执行其它系统功能。这种高度多功能性要求许多控制通道用两个
四路隔离器隔离。
与过程控制相比,工厂自动化常涉及监测多个器件和设备的单个物理量(如温度‘或压
力)。因此,这些系统采用多个同类型传感器,灵敏度和响应时间一致。
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