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. 11, 2001
Filed:
Jul. 06, 2000
Applicant:
Inventors:
Assignee:
Fuji Electric Co., Ltd., , JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03K 1/756 ;
U.S. Cl.
CPC ...
H03K 1/756 ;
Abstract
A circuit accurately detects an arm voltage pulse from an inverter that is used for on-delay compensation. Specifically, switching elements S,to S,are provided with detection circuits C,to C,, respectively, for detecting an on or off state of a corresponding inverter arm in order to detect an arm voltage pulse from the inverter accurately and without delay. Since outputs from the detection circuits C,, C,, C,on an upper arm have an excessively high voltage level before processing, level-down circuits Dw,, Dw,, Dw,reduce these outputs down to an appropriate voltage level for signals used by a control circuit. The outputs are then provided to an on-delay compensator in the control circuit.