US 6,983,383 B1
Method for providing priority to an ac adaptor if the input to the ac adaptor is above a predetermined value even if the power supply via an interface is present
Shuko Saito, Kawasaki (Japan); Akira Minami, Inagi (Japan); Shigeyoshi Tanaka, Higashine (Japan); and Satoshi Furuta, Kobe (Japan)
Assigned to Fujitsu Limited, Kawasaki (Japan)
Filed on Dec. 01, 1999, as Appl. No. 9/452,161.
Claims priority of application No. 11-092500 (JP), filed on Mar. 31, 1999.
Int. Cl. G06F 1/26 (2006.01)
U.S. Cl. 713—300 16 Claims
OG exemplary drawing
 
1. A power supply control device comprising:
a first power supply input terminal to which a power supply is provided via an interface;
a second power supply input terminal to which a power supply is provided via an AC adaptor;
a power supply input detection unit determining whether an input of said second power supply input terminal is above a predetermined value;
a switching unit cutting off power supplied by said first power supply input terminal via the interface, and activating a power supplied by said second power supply input terminal via the AC adaptor if the input to said second power supply input terminal is above the predetermined value even if the input to said second power supply input terminal via the interface is present; and
a power supply processor processing the power supplied by one of said first or second power supply input terminals.