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Describing function properties of a magnetic pulse-width modulator

Middlebrook, R. D. (1972) Describing function properties of a magnetic pulse-width modulator. In: 1972 IEEE Power Electronics Specialists Conference. IEEE , Piscataway, NJ, pp. 21-35.

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An analysis is presented for the transfer functions of a particular pulse-width modulator and power switch subsystem that has been widely used in practical switching-mode d-c regulator systems. The switch and filter are in a "buck" configuration, and the switch is driven by a constant-frequency variable duty-ratio push-pull magnetic modulator employing square-loop cores. The two transfer functions considered are that with modulator control signal as input and that with line voltage as input. For a-c signals, the corresponding describing functions (DF) are derived. It is shown that current-source drive to the modulator extends the control DF frequency response over that with voltage drive, and that complete cancellation of the effects of line variations can be obtained at d-c but not for a-c. Experimental confirmation of the analytical results for the control DF are presented.

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Additional Information:© 1972 IEEE.
Record Number:CaltechAUTHORS:20151118-104559523
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Official Citation:Middlebrook, R.D., "Describing function properties of a magnetic pulse-width modulator," in Power Electronics Specialists Conference, 1972 IEEE , vol., no., pp.23-35, 22-23 May 1972 doi: 10.1109/PPESC.1972.7094883
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:62195
Deposited By: Tony Diaz
Deposited On:18 Nov 2015 19:12
Last Modified:10 Nov 2021 22:59

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