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:
May. 31, 1983
Filed:
Dec. 22, 1980
Applicant:
Inventor:
Quang M Pham, Elancourt, FR;
Assignee:
Societe Anonyme dite: Alsthom-Atlantique, Paris, FR;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02D / ;
U.S. Cl.
CPC ...
318261 ; 318375 ;
Abstract
An electronic circuit designed to control entirely by electronic means the change from traction mode to braking mode and vice-versa of a separately excited DC machine and the forward and reverse operation of the motor as well as rheostatic braking. The chopper includes two main thyristors (T1) and (T2) and a single switch-off thyristor (T3) for the two main thyristors. The direction of current flow through the separate excitation winding (J) is determined by four thyristors (T5) to (T8). Application to railway traction.