Patent ID: 7705562

Claim:
A switching power supply unit which has a charge accumulating unit and can supply an electric power to a load in case of emergency, wherein: an electric power converting circuit and a state monitoring and control unit having a state monitoring unit of the charge accumulating unit and a control unit for controlling the electric power converting circuit, are connected to the charge accumulating unit; the electric power converting circuit is connected to a direct-current line in the switching power supply unit so that a charge and a discharge of the charge accumulating unit can be performed; and a first backup unit of a first energy type bank for power failure compensation having the charge accumulating unit and the state monitoring and control unit therein and a second backup unit of a second energy type bank for an instantaneous drop compensation having the charge accumulating unit and the state monitoring and control unit therein, are configured to be replaced with each other and to be detachably provided in the same insertion slot of a casing of the switching power supply unit; and wherein the first back up unit of the energy bank for power failure compensation and the second back up unit of the energy bank for instantaneous drop compensation are connected to direct-current lines of different electric potentials in the switching power supply unit through a connector in the switching power supply unit.