Patent ID: 7834587
Filing Date: 2010-11-16
Classification: H02J,H02M

Abstract:
1. An uninterruptable power supply, comprising: a positive DC bus, a neutral DC bus, and a negative DC bus; a battery charger circuit having an inductor, a first charger output and a second charger output; a first switch having a first end coupled to a first end of the inductor, the first switch configured to selectively couple the positive DC bus with the first charger output; and a second switch having a first end coupled to a second end of the inductor, the second switch configured to selectively couple the negative DC bus with the inductor; wherein the inductor is a single inductor configured between the first end of the first switch and the first end of the second switch; wherein the neutral DC bus is coupled to the second charger output; and wherein the battery charger circuit is configured to draw power from at least one of the positive DC bus and the negative DC bus to charge a battery coupled to the first charger output and the second charger output.