| 摘要 |
A power supply device (4) is provided with: a DC-DC converter (13) that is disposed between an input and a VBUS output; a primary-side controller (30) that controls an input current of the DC-DC converter (13); and an insulated bidirectional circuit (34), which is connected to a control input, receives control input signals of the control input, and feeds back the signals to the primary-side controller (30). The primary-side controller (30) controls the input current of the DC-DC converter (13) on the basis of the control input signals fed back from the insulated bidirectional circuit (34), thereby making it possible to vary the output voltage value and the outputtable current quantity of the DC-DC converter (13). The power supply device, which has reduced mounting space, and reduced size and cost, and is capable of controlling the output voltage value and the outputtable current quantity (MAX value), an AC adaptor, an AC charger, an electronic apparatus, and a power supply system are provided. |
