NDLI: Switching Noise Improvement of a Limit-Cycle Amplifier Using a Negative Hysteresis Relay

Content Provider	IEEE Xplore Digital Library
Author	Duarte, M.J. Cabral, P.M. Pedro, J.C.
Copyright Year	1986
Abstract	Limit-cycle or self-oscillating power amplifiers (SOPAs) are seen as an effective and simple option to achieve linear yet efficient power amplification. Unfortunately, they suffer from unfiltered switching noise, also known as ripple, whose amplitude increases for progressively lower self-oscillating frequency. Moreover, such self-oscillating frequency changes with the input signal and its dependency curve, as well as its maximum, are determined by the overall loop delay and by the open-loop filter. To remedy this SOPAs' pitfall, this paper presents a method to increase the self-oscillation frequency and reduce frequency modulation for a fixed propagation delay and loop filter. This is achieved using a relay that exhibits a novel kind of hysteresis. For that, the theory of its working principle will be discussed in detail, its transfer characteristic will be defined, and an implementation suitable for VLSI will be proposed. To validate the concept, simulations and an experimental prototype were carried out to compare the behavior of existing types of SOPA with the proposed one.
Sponsorship	IEEE Power Electronics Society
Starting Page	3223
Ending Page	3231
Page Count	9
File Size	1323259
File Format	PDF
ISSN	08858993
Volume Number	29
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Relays Hysteresis Frequency modulation Oscillators Propagation delay Limit-cycles Switches relay control system limit-cycle amplifier negative hysteresis
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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