JP2009244676A5 - - Google Patents

Claims (6)

In an image forming apparatus that forms an image on a sheet by operating a plurality of loads,
A first power supply means connected to a commercial power supply and supplying DC power to the plurality of loads;
A second power supply means that is charged by the power supplied from the first power supply means and supplies DC power to at least one specific load of the plurality of loads;
Switching means for switching a power supply path so that power is supplied from one of the first power supply means and the second power supply means to the specific load;
The charging current of the second power supply means is controlled so that the current supplied from the commercial power supply does not exceed the maximum supply power of the commercial power supply, and the specific power is determined from the first power supply means by the switching means. In a state where power is supplied to the load , when the drive current of the specific load increases to a first predetermined value , the switching means is configured to supply power to the specific load from the second power supply means. An image forming apparatus comprising: a control unit that controls the image forming apparatus. A charging unit configured to fix the toner image formed on the sheet; and charging the second power supply unit while the switching unit supplies power from the second power supply unit to the specific load. 2. The image forming apparatus according to claim 1 , wherein when the voltage drops to a predetermined lower limit voltage, the control unit reduces the power consumed by the fixing unit . Storage means for storing paper,
Transport means for transporting paper from the storage means,
The image forming apparatus according to claim 2, wherein the control unit performs control to increase a sheet conveyance interval by the conveyance unit or control to decrease a conveyance speed when reducing the power consumed by the fixing unit. apparatus. A fixing unit configured to fix the toner image formed on the sheet; and when the fixing unit is heated to a target temperature in response to power-on of the image forming apparatus, the control unit includes the second power supply unit. The image forming apparatus according to claim 1, wherein the charging current is controlled so as not to be charged. 2. The image forming apparatus according to claim 1, wherein the specific load is a reading device that reads an image of a document, and the reading device can operate independently of the image formation during image formation on a sheet. apparatus. The control means supplies power to the specific load when the output current of the second power supply means falls below a second predetermined value during power supply from the second power supply means to the specific load. The image forming apparatus according to claim 1, wherein the switching unit is controlled so as to be performed from the first power supply unit.