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. 16, 1985
Filed:
Oct. 07, 1983
Applicant:
Inventors:
Dermot O'Sullivan, Leiderdorp, NL;
Jan Schreuders, Katwijk, NL;
Assignee:
Agence Spatiale Europeenne, Paris, FR;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G05F / ;
U.S. Cl.
CPC ...
323222 ; 323285 ;
Abstract
A controller apparatus comprising a phase-locked loop circuit which includes a phase comparator and a low-pass filter connected to accept a signal representing the switching frequency of the apparatus and an external frequency signal to produce a control signal for a controllable switch serving to vary the threshold levels of a reference signal, said control signal being a function of the phase difference between the input signals. The hysteresis of the apparatus is thereby changed over a few synchronization cycles in order to pull the controller into synchronization.