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:
Apr. 21, 2015
Filed:
Feb. 21, 2012
Applicant:
Motohiro Ando, Kyoto, JP;
Inventor:
Motohiro Ando, Kyoto, JP;
Assignee:
Rohm Co., Ltd., Kyoto, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02H 3/02 (2006.01); H02H 7/22 (2006.01); H02H 3/087 (2006.01); H02H 7/20 (2006.01);
U.S. Cl.
CPC ...
H02H 7/222 (2013.01); H02H 3/087 (2013.01); H02H 7/20 (2013.01);
Abstract
A ground protection circuit () includes: a sensing resistor (R), disposed on a path which a charging current (IB) of a bootstrap circuit (D, C) flows through; a comparator (), for comparing a voltage (ΔV) between two ends of the sensing resistor (R) and a specific threshold voltage (Vth) to generate a ground protection signal (S); and a logic gate (), for enabling the ground protection signal (S) to be invalid in a normal charging operation of the bootstrap circuit.