ZERO DEGREE PHASE COMPARATOR

A variable frequency three-phase square wave signal is synchronized to a three-phase reference frequency signal at a substantially zero degree phase relation. Synchronization is accomplished in but a few cycles by comparing each component of the two signals to be compared and also comparing both pos...

Full description

Saved in:
Bibliographic Details
Main Author SCHAEFER D,US
Format Patent
LanguageEnglish
Published 11.12.1973
Subjects
AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATIONOF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
BASIC ELECTRONIC CIRCUITRY
ELECTRICITY
Online AccessGet full text

Cover

More Information
Summary:A variable frequency three-phase square wave signal is synchronized to a three-phase reference frequency signal at a substantially zero degree phase relation. Synchronization is accomplished in but a few cycles by comparing each component of the two signals to be compared and also comparing both positive and negative going half cycles of each component. Six phase error magnitude pulses are generated for each cycle and identified according to phase error sense to provide an output error signal having a magnitude proportional to the magnitude of the phase error and having a polarity indicating phase error sense. The output signal trims the frequency of one of the signals being compared to cause the phase error to approach zero degrees.
Bibliography:Application Number: USD3778723