Patent ID: 8874940

Claim:
A power control system for controlling power supply operation to supply power to an electronic device including a first drive mode and a second drive mode that is driven under a load relatively lower than a load in the first drive mode, the power control system comprising: a plurality of power supply units, each including a transformer; and a power supply unit selection section to, depending on which one of the first and second drive modes the electronic device is in, select one or a plurality of power supply units to be used from the plurality of power supply units, wherein the power supply unit selection section is configured to select the one or a plurality of power supply units to be used from the plurality of power supply units such that each of the power supply units to be used to supply power to the electronic device in the second drive mode is one or some of each of the power supply units to be used to supply power to the electronic device in the first drive mode; power-factor improvement circuits, each respective one of the power-factor improvement circuits being included in a respective one of the plurality of power supply units which is useable to supply power to the electronic device in the second drive mode; and a power-factor improvement circuit control section to, depending on which one of the first and second drive modes the electronic device is in, switch whether to actuate or not actuate the power-factor improvement circuit, wherein the power-factor improvement circuit control section is configured to actuate the power-factor improvement circuit in the first drive mode and is configured to not actuate the power-factor improvement circuit in the second drive mode.