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:
Aug. 24, 1976
Filed:
Mar. 27, 1975
Kjell Rehnman, Vasteras, SW;
Allmanna Svenska Elektriska Aktiebolaget, Vasteras, SW;
Abstract
A controlled static convertor has terminals for connection to an alternating current source and includes controlled rectifiers and a control pulse device for delivering control signals to the rectifiers. The control pulse device includes arrangements for affecting the control angle (.alpha.) of the rectifiers and for limiting the control angle to an upper limit value. Devices are provided to render the control angle limiting arrangement inactive when the direct current of the convertor is discontinuous. The direct current of the convertor is sensed and, if this current at a time corresponding to the upper limit value of the control angle is less than a predetermined limit value, renders the control angle limiting arrangement inactive.