Patent ID: 7847435

Claim:
An intrinsically phase-balanced direct current (DC) uninterruptible power supply (UPS), comprising: a first alternating current (AC) phase input; a second AC phase input; a third AC phase input; a first rectifier including a first output and a first input coupled to the first AC phase input, the first rectifier configured to rectify the first AC phase input; a second rectifier including a second output and a second input coupled to the second AC phase input, the second rectifier configured to rectify the second AC phase input; a third rectifier including a third output and a third input coupled to the third AC phase input, the third rectifier configured to rectify the third AC phase input; a common node directly coupled to the first output, the second output, and the third output, the common node configured to combine the rectified first AC phase input, the rectified second AC phase input, and the rectified third AC phase input; a first DC output coupled to the common node, the first DC output configured to coupled the DC UPS to a first electrical load; a second DC output coupled to the common node, the second DC output configured to couple the DC UPS to a second electrical load; a third DC output coupled to the common node, the second DC output configured to couple the DC UPS to a third electrical load; a battery; and a switch coupled between the battery and the common node, wherein the switch and the battery are configured to selectively provide back up power to the common node in an event of a power loss from one or more of the first AC phase input, the second AC phase input, and the third AC phase input.