Patent ID: 8830516

Claim:
A power supply control device arranged between a commercial power supply and an image forming apparatus, comprising: a power conversion portion to convert power supplied from the commercial power supply from alternating current to direct current; a control portion supplied with power from the power conversion portion; a first communication portion supplied with power from the power conversion portion and connected to a network; a second communication portion connected to the image forming apparatus; and a device power supply switch arranged between the commercial power supply and the image forming apparatus, the control portion including a mode decision portion to acquire a state of the image forming apparatus by communicating with the image forming apparatus through the second communication portion and to decide between a normal mode and a power-saving mode in which power consumption is smaller than in the normal mode, a positional information acquisition portion to acquire positional information allocated beforehand to the image forming apparatus to indicate a position on the network, a sleep switch portion to open the device power supply switch when the sleep mode is decided by the mode decision portion, an activation portion to close the device power supply switch in response to a packet including the positional information of the image forming apparatus being received by the first communication portion from the network, after the sleep mode is decided by the mode decision portion, a temporary storage control portion to temporarily store a packet including the positional information of the image forming apparatus, among packets received by the first communication portion from the network, after the sleep mode is decided by the mode decision portion, a packet transmission portion to transmit the temporarily stored packet through the second communication portion in response to the normal mode being decided by the mode decision portion, and a connection portion to connect the network connected to the first communication portion to the second communication portion after transmission by the packet transmission portion is finished.