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:
Jun. 09, 1981
Filed:
May. 25, 1979
Applicant:
Inventor:
Robert B Molyneux-Berry, Danbury, GB;
Assignee:
The Marconi Company Limited, Chelmsford, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03C / ; H03K / ;
U.S. Cl.
CPC ...
332-1 ; 332 / ; 332 / ; 332 64 ; 332 67 ; 375 22 ; 375 41 ;
Abstract
A pulse width modulation circuit which uses a tube, such as a tetrode tube as the switching element, is arranged to minimise excessive power dissipation in the screen electrode circuit of the tube. The screen electrode is driven from a constant current source to prevent excessive current being diverted from the cathode to the screen electrode which would otherwise occur when the impedance of the anode circuit rises to a high value.