Patent ID: 8896152
Filing Date: 2014-11-25
Classification: H02J

Abstract:
1. An uninterruptible power supply comprising: a first input to receive input power from an input power source; an output to provide output power; a switch configured to close when a characteristic of the input power is within a selected range; a first logic power supply coupled to the switch, configured to receive input power from the input power source when the switch is closed, and having a first DC output; a backup power source having a second DC output and coupled to the first DC output at a common node; a charger having a third DC output and coupled to the common node; a main logic power supply coupled to the common node and configured to receive the first DC output, the second DC output and the third DC output; and power converter circuitry coupled to the backup power source and the first input and configured to provide the output power derived from at least one of power at the first input and power from the backup power source.