"Use of the MOSFET channel reverse conduction in an inverter for suppression of the integral diode recovery current"

"Use of the MOSFET channel reverse conduction in an inverter for suppression of the integral diode recovery current" Copyright - [Précédente] [Première page] [Suivante] - Home

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Titre : Use of the MOSFET channel reverse conduction in an inverter for suppression of the integral diode recovery current

Auteurs : Huselstein, J.-J.; Gauthier, C.; Glaize, C. (Lab. d'Electrotech. de Montpellier, France)

Info : recherche du 4 juin 1998, STN - INSPEC

Publication Source :
Fifth European Conference on Power Electronics and Applications (Conf. Publ. No.377)
London, UK: IEE, 1993. p.431-6 vol.2 of 8 vol.
(cx+232+xvi436+xiv+343+xvi483+xxii512+xxii+166+x+205+xii+281) pp. 6 refs
Conference Brighton, UK, 13-16 Sept 1993
Sponsor(s) : IEE

Abstract :
If the integral diodes are used as free-wheeling diodes of a MOSFET
half-bridge inverter, the reverse recovery current can be high
during the transistor integral diode turn-off. It generates
important switching losses and can be induced a transistor failure.
This paper shows how to take advantage of the negative channel
conduction in a MOSFET to prevent the integral diode conduction and
suppress the reverse recovery current. The current is transferred
directly from a transistor channel to the opposite one, avoiding the
limitation imposed by the diode conduction. This method requires a
very fine adjustment of the delay time between the gate drive
signals applied to the two transistors to obtain an optimal
switching. So the authors propose a method to measure the current
during the switching which allows the design of a regulation acting
on the transistor gate drive signals, so that they can have
switching with a minimal overcurrent transient. The current
measurement, when it is integrated into the converter, must be
economical, with a large bandwidth. Experimental results showing the
reverse recovery current variations and the behaviour of the
measurement device integrated into the converter are presented.

Accession Number : 93:4553627

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