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:
Apr. 12, 1977
Filed:
Dec. 22, 1975
Applicant:
Inventor:
Frederick O Johnson, Monroeville, PA (US);
Assignee:
Westinghouse Electric Corporation, Pittsburgh, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03K / ; H02M / ; H02M / ;
U.S. Cl.
CPC ...
3072 / ; 307269 ; 321 / ; 323 / ;
Abstract
A digital pulse generator for firing thyristors in a polyphase converter system is described in an hybrid analog-digital and in an all digital form. A phase locked oscillator associated with a digital counter generates timing waveforms synchronized with the phase lines to establish firing angles in relation to a reference signal. Each firing pulse triggers the logic circuit of a distributor and a multiplexer is coupled with such logic circuitry in order to insure that the proper timing waveform is selected so as to match the selection of the next thyristor to be fired.