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:
Sep. 05, 1989
Filed:
Mar. 22, 1988
Applicant:
Inventors:
Assignee:
Fuji Electrochemical Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03K / ;
U.S. Cl.
CPC ...
307362 ; 307234 ; 328 28 ; 328 32 ; 328111 ; 328150 ;
Abstract
A rectified ac voltage which is not smoothed is compared with a reference voltage directly, and a pulse is generated when the instantaneous value of the rectified ac voltage exceeds the reference voltage. Based on the pulse generation, a judgement is performed on whether the ac voltage is reaching a predetermined value or not. These operations allow the abnormality of the ac voltage to be rapidly detected with improved accuracy.