Title :
An Incrementally Variable Phase-Locked Control for a Polyphase Inverter
Author :
Smith, Brian H. ; Cook, Christopher D.
fDate :
3/1/1978 12:00:00 AM
Abstract :
In practice there is often a requirement for two separate polyphase supplies, the relative phase of which can be controlled precisely and varied at will. A relatively simple circuit, incorporating a phase-locked loop and coincidence detector, is presented which enables any conventional polyphase inverter to be triggered from any other polyphase source, to produce a second polyphase supply having any desired phase relationship with the first. A pulse input causes a step change in phase, of any size determined by initial design. Variations may be positive or negative, random or continuous; so providing the possibility of precise open-loop position and speed control of doubly fed devices.
Keywords :
Counting circuits; Induction motors; Phase control; Phase detection; Phase frequency detector; Phase locked loops; Pulse inverters; Pulse shaping methods; Size control; Velocity control;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
DOI :
10.1109/TIM.1978.4314622