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Image forming apparatus and power supply control method for switching between a main power supply and an auxiliary power supply

  • US 9,292,775 B2
  • Filed: 05/19/2014
  • Issued: 03/22/2016
  • Est. Priority Date: 05/24/2013
  • Status: Active Grant
First Claim
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1. An image forming apparatus comprising:

  • a main power supply;

    an auxiliary power supply that stores therein power from the main power supply, and that supplies the stored power; and

    circuitry configured to;

    detect an amount of charge of the auxiliary power supply and control charge of the power from the main power supply to the auxiliary power supply, independent of a state of the image forming apparatus when the power is supplied from the main power supply to the image forming apparatus;

    perform control of switching a power supply source to the auxiliary power supply when the main power supply is off, and perform control of switching the power supply source to the main power supply when the main power supply is on;

    detect whether the power supply source is the main power supply or the auxiliary power supply;

    perform control of switching a data transfer rate from that of a first high-speed mode to that of a first low-speed mode which allows power consumption lower than that of the first high-speed mode when the auxiliary power supply is detected as the power supply source, the data transfer rate being of data exchanged between the image forming apparatus and an external device;

    perform control of switching a print speed from that of a second high-speed mode to that of a second low-speed mode which allows the power consumption lower than that of the second high-speed mode when the auxiliary power supply is detected as the power supply source;

    notify a printer driver in the external device when the print speed is switched to the second low-speed mode or the second high-speed mode; and

    control a display of the printer driver on the external device.

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