Power supply isolation circuit and method

摘要

A power system has a first power supply operatively connect in parallel to a second power supply. The output of the first power supply is connected to the input of a switching device, such as a mosfet. The output of the switching device is the output of the power system. A measuring device, such as a differential amplifier measures the polarity between the input and output of the switching device. A controller connected to the switching device permits the switching device to conduct current if a first polarity is present between the input and the output. The controller interrupts current flow if a second polarity is present between the input and the output.