Patent ID: 9054556
Filing Date: 2015-06-09
Classification: H02J,Y02B,Y04S

Abstract:
1. A power supply device for supplying power to a load, comprising: a power conversion circuit configured to convert input power into output power; a secondary battery; and a control means configured to control the power supply device to perform a first operation in which, in a state that said input power is continuously supplied to said power conversion circuit, during a first period that said power conversion circuit receives an input power having an increased input power amount greater than a normal input power amount corresponding to a necessary power for said load, said power conversion circuit is turned on and supplies the necessary power to said load, and said secondary battery is charged by surplus output power of said power conversion circuit, and during a second period, said power conversion circuit is turned off and said secondary battery supplies the power accumulated by said charging to said load, wherein said control means compares an average necessary input power amount needed for an operation in which said power conversion circuit supplies power to said load without using said secondary battery with an average necessary input power amount needed for said first operation in consideration of a power conversion efficiency of said power conversion circuit and in further consideration of a charging efficiency of said second battery, and controls the power supply device to perform either of the operations on the basis of the comparison result, and said average necessary input power amount needed for an operation in which said power conversion circuit supplies power to said load without using said secondary battery is calculated on the basis of the power conversion efficiency of said power conversion circuit, the power conversion efficiency depending on input power of the power conversion circuit, and said average necessary input power amount needed for said first operation is calculated on the basis of said power conversion efficiency and the charging efficiency of said secondary battery, the charging efficiency depending on charging power.