单火线开关供电电源部份的工作原理详谈,单火线开关的供电一般是分成两部份来实现对控制电路的供电：关态供电和开态供 电，下面分别加以说明(The working principle of switch power supply for single FireWire is discussed in detail The power supply of the single wire switch is generally divided into two parts to realize the