Patent ID: 7840840
Filing Date: 2010-11-23
Classification: H02J

Abstract:
1. A DC backup power supply system having a plurality of loads to which AC from a commercial power source is supplied, and DC power storage means for supplying DC power to the plurality of the loads at the time of a power outage of the commercial power source, said DC backup power supply system comprising: a control circuit having a first DC backup output for supplying a power from the DC power storage means to the plurality of the loads, including a specific load of a cache memory, during a predetermined initial time of the power outage of the commercial power source and/or until a predetermined signal from the loads, and a second DC backup output for continuously supplying a power from the DC power storage means to the specific load regardless of the power outage of the commercial power source or sound operation thereof, the control circuit supplying the respective powers from the same DC power storage means to the first and second DC backup outputs, wherein a power capacity of the second DC backup output being smaller than a power capacity of the first DC backup output.