Patent ID: 7683297

Claim:
An electric power supply control device comprising: an electric power supply part supplying electric power to a heat-generating member, which generates heat by electric power being supplied thereto, and to an electric power requiring part, which requires electric power to operate; a control part controlling electric power supplied to said heat-generating member and said electric power requiring part; a main electric power supply device and an auxiliary electric power supply device provided in said electric power supply part; and an auxiliary electric power supply state detector detecting a state of said auxiliary electric power supply device, wherein said control part includes: a first electric power supply mode to supply electric power to said heat-generating member from only said main electric power supply device and supply electric power to said electric power requiring part from both said main electric power supply device and said auxiliary electric power supply device; and a second electric power supply mode to supply electric power to said heat-generating member and said electric power requiring part from only said main electric power supply device and causing electric power supplied to said heat-generating member to be smaller than a rated electric power of said heat-generating member, wherein the electric power supplied to said heat-generating member in the first electric power supply mode is caused to be larger than the electric power supplied to said heat-generating member in the second electric power supply mode, and wherein said control part selectively switches between the first electric power supply mode and the second electric power supply mode in accordance with detection information output from said auxiliary electric power supply state detector when the electric power consumed by said heat-generating member is increasing, and wherein said control part controls said electric power requiring part to reduce an amount of printing by reducing an amount of electric power supplied to said electric power requiring part from said auxiliary electric power supply device when a remaining amount of electric power of said auxiliary electric power supply device detected by said auxiliary electric power supply state detector is smaller than a previously set setting value.