比较器感应到数字线路的状态，而不画线的电源。 Maxim > App Notes > Amplifier and Comparator Circuits
Keywords: galvanic isolation, digital state detection, single-turn transformer Mar 23, 2005
APPLICATION NOTE 3473
Read Isolated Digital States Without Power Drain
Abstract:A simple circuit employs a small transformer and latched comparator to sense the state of a digital line without drawing
power from the line.
A similar version of this article appeared in the November 25, 2004 issue of EDN magazine.
Electronic systems must often isolate their inputs or outputs from the main reference common (ground). Various conditions can
make necessary such galvanic isolation: the type of input sensor or driven actuator, safety considerations for medical equipment
attached……
