A power supply system includes: a switching power supply and a rectifying/smoothing circuit, the switching power supply configured to output a first output voltage in a normal output mode; a step-down circuit; a control device that controls the switching o...

A power source unit includes an AC/DC converter to convert alternating current to direct current output, an auxiliary power source storing electric power, a load detector to detect a high/low level of direct current output to a DC-using load device from th...

A power storage apparatus (41) is disclosed, which includes a charge-able and discharge-able capacitor unit (42), discharged power being supplied to an electrical load (23). The power storage apparatus includes a detection unit (48-50) configured to determ...