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:
Jul. 11, 1978
Filed:
Dec. 13, 1976
Applicant:
Inventor:
Katsu Komuro, Katsuta, JP;
Assignee:
Hitachi, Ltd., , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03K / ;
U.S. Cl.
CPC ...
307262 ; 3072 / ; 3072 / ; 3072 / ; 307282 ;
Abstract
A phase control apparatus is disclosed wherein a pair of transistors are alternately switched by an A.C. signal source. Each of the transistors is connected in series with an auxiliary thyristor and a primary winding of a pulse transformer to a D.C. power supply. Each of the auxiliary thyristors is fired by a magnetic phase shifter having an A.C. winding connected between a positive terminal of the D.C. power supply and a gate of the auxiliary thyristor. Connected to secondary windings of the pair of pulse transformers are gate circuits of a pair of main thyristors to which an A.C. voltage which is substantially in synchronism with the A.C. signal source is applied.