Patent ID: 8611778
Filing Date: 2013-12-17
Classification: G03G,H02J

Abstract:
1. A power supply system comprising: a switching power supply that includes a transformer in which a voltage is induced on a secondary side by oscillation of a primary side and a rectifying/smoothing circuit which rectifies and smoothes the induced voltage, the switching power supply configured to output a first output voltage in a normal output mode; a step-down circuit that is provided on an output side of the switching power supply and reduces the first output voltage to a second output voltage; a control device that controls the switching of the switching power supply between the normal output mode, a low output mode in which an output voltage is a third output voltage less than the first output voltage, and an off mode that stops the oscillation of the primary side of the transformer; and an electric storage unit that is charged by the output of the step-down circuit in the normal output mode and supplies power to the control device in the off mode, wherein, when charging is needed in the mode other than the normal output mode and the low output mode, the control device controls the switching power supply to output the third output voltage, thereby charging the electric storage unit.