Describing function properties of a magnetic pulse-width modulator
- Creators
- Middlebrook, R. D.
Abstract
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.
Additional Information
© 1972 IEEE.Attached Files
Published - 07094883.pdf
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Additional details
- Eprint ID
- 62195
- Resolver ID
- CaltechAUTHORS:20151118-104559523
- Created
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2015-11-18Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field