| 摘要 |
PURPOSE:To lower a cost and miniaturize a device by converting a commercial AC power source to DC power output, and by providing the output side of a rectifier circuit for supply the DC power output to an electric equipment, with a secondary battery and a charging circuit. CONSTITUTION:A power-supply device 10 is composed of a line filter 2, a primary rectifying and smoothing section 3, an inverter section 5, a secondary rectifying and smoothing section 7, and the like. Besides stabilizing DC power output, a feedback circuit 11, the switches 20, 21 of a charge and discharge circuit 22, and a secondary battery 25 are connected to the device 10. At the time of a state that the voltage lowering of input power is not found, the DC power is stored in the secondary battery 25 via the switch 20. When the supply capacity of an input power source is short under the working of an electrical equipment, then the DC power stored in the secondary battery 25 is fed to the electric equipment via the switch 21. |
