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:
Dec. 13, 1977
Filed:
May. 22, 1975
Theodore A Oliver, Ann Arbor, MI (US);
Reliance Electric Company, Cleveland, OH (US);
Abstract
A digital firing control for a three-phase full wave silicon controlled rectifier converter. An error signal, in digital form, representing a desired change in firing angle which is a function of the difference between the current being supplied by the converter and a desired current, is utilized to advance or retard the firing angle of the SCR's as required to eliminate the error. Each subsequent firing command is referenced on a time basis from the firing command of the previously fired SCR in the firing sequence rather than being referenced from the zero voltage point of the alternating current supply voltage. The error signal is averaged over the time interval between firing commands so that the control responds to the average difference between the current being supplied and the desired current.