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. 06, 1976
Karl-Friedrich Leowald, Erlangen, DT;
Siemens Aktiengesellschaft, Berlin and Munich, DT;
Abstract
Apparatus for firing the thyristors or valves in parallel connected first and second valve branches. More particularly, a firing device is provided for providing firing pulses to at least a first valve in the first valve branch. A refiring device is provided which includes a transformer for determining the difference in the current carried by the first valve and a second valve adjacent thereto in the second valve branch. The latter refiring device also comprises a threshold member which, when the current difference determined by the transformer exceeds a predetermined value, causes the one of the first and second valves carrying the lesser current to receive firing pulses.