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:
Oct. 28, 1997
Filed:
May. 11, 1995
Applicant:
Inventors:
Helmut Lothar Schroder-Brumloop, Berlin, DE;
Sven-Oliver Rainer Kersten, Berlin, DE;
Assignee:
Otis Elevator Company, Farmington, CT (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B66B / ; H01J / ;
U.S. Cl.
CPC ...
187296 ; 187393 ; 320-1 ;
Abstract
An elevator drive circuit is used for maintaining the voltage across first and second serially connected capacitors having first and second ends. The circuit comprises an active stabilizer for substantially maintaining a predetermined value of the voltage at a connection node of the capacitors. The active stabilizer provides compensation in response to deviations from the predetermined value of the voltage at the connection node.