可编程器件在三工位开关控制器中的应用

三工位开关是一种同时具有接地和隔离作用的装置，在计算机控制的输配电系统中有着较为广泛的应用。介绍了一种利用模拟可编程器件和数字可编程器件设计三工位开关控制器的方案，并给出了具体的电路图和程序代码，首先分析了三工位开关的3个工作位置的相互关系，给出了表示三工位间的状态转换关系的真值表，然后介绍了根据所给真值表设计的VHDL语言程序，在介绍的方案中，信号输入回路采用了模拟可编程器件ispAC10，核心部件采用了ispLSI 1016数字可编程器件，实现了就地／远方控制等多种功能，该方案设计的控制器具有使用元件少，抗干扰性能好，可扩充性强的特点。

Application of programmable devices in three position switch controller

Three position switch is a compact device with earthing and isolating functions,which is widely used in power distribution systems.A scheme for designing the three-position switch with both analog and digital devices is presented with specific diagram and program code.By analy-zing the relations of the three positions,a truth table is given,from which the VHDL program is made.The analog programmable device ispAC10is used in the signal-input channel and the digital pro-grammable device ispLSI 1016is used as primary control component.With a few components,the remote and local control functions and some other functions can be realized.The introduced controller has excellent extensibility and anti-jamming performance.