The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 06, 2006
Filed:
Oct. 15, 2003
Applicants:
Katsuya Oyama, Chiyoda-ku, JP;
Shoji Sasaki, Chiyoda-ku, JP;
Inventors:
Katsuya Oyama, Chiyoda-ku, JP;
Shoji Sasaki, Chiyoda-ku, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G05F 1/44 (2006.01);
U.S. Cl.
CPC ...
Abstract
The reliability of the power supply unit which supplies a different voltage to the microcomputer with two or more power supplies is improved. The power supply unit is composed of first regulator, at least one second regulatorwhich generates the voltage lower than that of the first regulator, means for detecting the output voltage of the first regulator, and means for stopping the second regulatorwhen the output voltage Vof the first regulatordrops lower than the first fixed voltage.