Patent ID: 7773375
Filing Date: 2010-08-10
Classification: G06F

Abstract:
1. A uninterruptible power supply adapted to be electrically interposed between a DC power bus at a first voltage level and a device that is benefited by an uninterrupted supply of DC power at a second voltage level, comprising: (a) a pre-regulator connected to said DC power bus, having an output and adapted to accept electrical power at said first voltage level and provide power at above said second voltage level at said output; (b) a diode having a first terminal connected to said output and oriented to prevent current flow to said output and having a second terminal; (c) an intermediate bus connected to said diode second terminal and also connected to said device, said second bus maintained at approximately said second voltage; (d) a battery that is adapted to supply power at approximately said second voltage level and adapted to accept a charge at a third voltage level; (e) a boost converter electrically interposed between said battery and said intermediate bus and adapted to accept electric power from said intermediate bus and supply electric power at said third voltage level to said battery input; (f) a switch coupled between said battery and said device so that current may flow from said battery to said device only when said switch is closed; (g) a diode placed so as to prevent current from flowing from said battery to said pre-regulator output; and (h) a sensing and control assembly adapted to sense a low voltage condition at said pre-regulator output and to close said switch and deactivate said boost converter in response thereto, thereby permitting said battery to power said device, and adapted to afterwards open said switch and activate said boost converter when a set period of time has passed and said pre-regulator output voltage has been restored to a value above said second voltage level.