Patent ID: 6621180
Filing Date: 2003-09-16
Classification: H02J

Abstract:
A power supply system for providing power to a load comprising:a plurality of sources; a plurality of power supplies, each of the plurality of power supplies having an input and an output; each of the plurality of power supplies being coupled to one of the plurality of sources, one of the plurality of power supplies providing a power status signal; the outputs of the plurality of power supplies being coupled together; a switching circuit coupled to the plurality of sources and coupled to the plurality of power supplies for receiving a bias voltage signal output from the plurality of power supplies and for receiving the power status signal; and a back up power supply, the back up power supply having an input and an output, the input of the back up power supply being coupled to the switching circuit and the output of the back up power supply being couple to the output of the plurality of power supplies, wherein the switching circuit monitors the power status signal and switches in the back up power supply when a power interruption occurs.