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Title: Phase-locked loop with controlled phase slippage

A system for synchronizing a first subsystem controlled by a changing frequency sweeping from a first frequency to a second frequency, with a second subsystem operating at a steady state second frequency. Trip plan parameters are calculated in advance to determine the phase relationship between the frequencies of the first subsystem and second subsystem in order to obtain synchronism at the end of the frequency sweep of the first subsystem. During the time in which the frequency of the first subsystem is sweeping from the first frequency to the second frequency, the phase locked system compares the actual phase difference with the trip plan phase difference and incrementally changes the sweep frequency in a manner so that phase lock is achieved when the first subsystem reaches a frequency substantially identical to that of the second subsystem.
  1. (Cedar Hill, TX)
Issue Date:
OSTI Identifier:
Universities Research Association, Inc. (Washington, DC) FNAL
Patent Number(s):
US 5298867
Contract Number:
Research Org:
Country of Publication:
United States
phase-locked; loop; controlled; phase; slippage; synchronizing; subsystem; changing; frequency; sweeping; operating; steady; trip; plan; parameters; calculated; advance; determine; relationship; frequencies; obtain; synchronism; sweep; time; locked; compares; difference; incrementally; changes; manner; lock; achieved; reaches; substantially; identical; controlled phase; phase difference; substantially identical; phase relationship; phase-locked loop; frequency sweeping; controlled ph; /315/327/331/