Active-Snubbing Or Passive-Snubbing for Fast Switches?

Francis Robinson, Barry Williams

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Abstract

As power-switches improve, the primary function of switching-aid circuits changes from modifying the shape or rate-of-traverse of V-I loci within device
safe-operating-areas (SOA's), to clamping transient current and voltage, at turn-on and turn-off, below peak current and voltage ratings. Also, as device
ruggedness and device parameters are improved, or made less variable between devices and with operating conditions, active-snubbing or active-clamping becomes feasible, whereby the magnitude of peak-current at turn-on and peak-voltage at turn-off are limited by gate or drive-circuit control, or inherently by the devices themselves. Examples have been reported, however, none of these adequately compares active and passive snubbing, or exposes salient disadvantages in active-snubbing. A more objective appraisal of active snubbing
is attempted here, which uses as its basis for comparison; turn-on and turn-off commutation energy-loss, on-state energy-loss, overload capacity,
and turn-on and turn-off delay. Irrespective of whether active or passive snubbers or clamps are used, switch turn-off voltage-waveforms are often characterised by fast voltage-overshoot above the dc-supply voltage, or above the threshold-level of voltage-clamps, when used. High-frequency ringing
inevitably follows turn-off, or the beginning or end of voltage-clamping. The cause and solution are examined.
Original languageEnglish
Title of host publication14 Annual Conference of Industrial Electronics Society. IECON '88.
Place of PublicationSingapore
PublisherIEEE
Pages617-622
Number of pages6
Volume3
DOIs
Publication statusPublished - 1988
Event14th Annual Conference of Industrial Electronics Society, 1988. IECON 1988 - Singapore, Singapore
Duration: 24 Oct 198827 Oct 1988

Conference

Conference14th Annual Conference of Industrial Electronics Society, 1988. IECON 1988
CountrySingapore
CitySingapore
Period24/10/8827/10/88

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  • Cite this

    Robinson, F., & Williams, B. (1988). Active-Snubbing Or Passive-Snubbing for Fast Switches? In 14 Annual Conference of Industrial Electronics Society. IECON '88. (Vol. 3, pp. 617-622). IEEE. https://doi.org/10.1109/IECON.1988.665754