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:
Jan. 06, 1987
Filed:
Sep. 12, 1985
Horst Reick, Effeltrich, DE;
Gerhard Kratz, Heroldsbach, DE;
Siemens Aktiengesellschaft, Munich and Berlin, DE;
Abstract
An inductive load 1, more specifically a direct current motor, is fed by a direct current source through a semiconductor regulator which contains two parallel switching controllable semiconductor rectifier elements with identical conduction direction which in turn are in series with a respective one-half of center tapped output autotransformer. Parallel to the semiconductor regulator is an additional and identical semiconductor regulator. The center tap points of both semiconductor regulator autotransformers are connected with the terminals of a third output autotransformer which is similarly center tapped, whereby the center tap point of the third output autotransformer is connected to a terminal (+) of the inductive load. The control assembly is made in such a manner that it produces clock frequency signals with identical control levels for both semiconductor rectifier elements; however, these signals for the two parallel switching arrangements are, electrically offset by 90 degrees. In this way, it is possible to operate the motor in RPM ranges where a minimum of ripple current is obtainable.