Abstract
Control systems in which the input and feedback signals of a plant are pulse-frequency modulated and the resulting pulses locked by a phase-locked loop are investigated. These systems are assumed to be regulator systems, and the input and feedback signals are converted into sequences of standard pulses using integral pulse frequency modulation (IPFM). These sequences of pulses are then compared in a phase comparator which produces a plant excitation signal that is dependent on the degree to which the feedback pulses track the input pulses. The objective of this paper is to investigate the conditions under which the proposed systems will operate in a phase-locked mode during steady state. The locking conditions, which include stability considerations, are developed. Examples which compare theoretical results to those obtained from system simulations are presented. These comparisons show that the theoretical results agree with those obtained in the simulations, i.e. locking does not occur when the plant gai...
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