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以智能电气阀门定位器的控制电路为例，讨论了低功耗二线制的一种实现方法。由于是４２０mA二线制供电，所以在设计中采取了一系列措施，实现了系统的低功耗运行，达到了二线制供电的基本指标。
Taking the control circuit of intelligent electric valve positioner as an example, a realization method of low power two wire system is discussed. Because it is 420mA second-line power supply, so in the design to take a series of measures to achieve a low-power system operation, to achieve the basic indicators of two-wire power supply.