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:
Dec. 08, 2009
Filed:
Dec. 27, 2006
Applicants:
Guoxing LI, Sunnyvale, CA (US);
Shiqiang Liu, Chengdu, CN;
Sean Xiao, Shanghai, CN;
Inventors:
Assignee:
O2Micro International, Ltd., Georgetown, KY;
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02J 7/00 (2006.01); H02J 1/00 (2006.01); H02J 3/00 (2006.01); H02H 3/20 (2006.01); H02H 3/24 (2006.01);
U.S. Cl.
CPC ...
Abstract
A protection device for non-common ground buses is disclosed. The protection circuit includes a controller, a level shifter, a first group of switches, and a second group of switches. The controller together with the level shifter controls the first group and second group of switches. The non-common ground buses will be isolated when at least one group of the switches are turned off in an abnormal condition.