Patent ID: 7518342

Claim:
An apparatus for effecting power distribution to a host system at a system supply locus from one of a voltage supply source or a battery unit; the apparatus comprising: (a) a current transfer unit having a first connection locus and a second connection locus; said second connection locus being coupled with said battery unit; and (b) a control device switchingly coupling said first connection locus to effect generally alternating connection with said voltage supply source and with a system low potential locus; said control device being sensingly coupled with said voltage supply source and within the apparatus for receiving a plurality of indicating signals, the plurality of indicating signals comprising indicators of input voltage, system supply voltage, battery voltage, battery current magnitude and direction; said control device responding to said plurality of indicating signals to control said generally alternating connection to achieve stepped up voltage delivery of voltage presented by said battery unit to said system supply locus when said plurality of indicating signals indicate a first circumstance; said control device responding to said plurality of indicating signals to switchingly control said generally alternating connection to achieve charging said battery unit when said plurality of indicating signals indicate a second circumstance said control device being adapted to switchingly disconnect the first connection locus from both the voltage supply source and the system low potential locus before each alternating connection of the first connection locus to the voltage supply source and the system low potential locus.