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Re: DRSSTC question



Original poster: Steve Ward <steve.ward@xxxxxxxxx>

The internal diodes on any IGBT seem to be just as fast (if not faster) than the IGBT itself. IGBTs are being made with what seem to be very good diodes built in. People used to disable the internal diode on MOSFETs, but i find that this is unnecessary as well, and that usually the internal diodes are good enough.

Steve

On 9/23/05, Tesla list <<mailto:tesla@xxxxxxxxxx>tesla@xxxxxxxxxx> wrote:
Original poster: <mailto:FIFTYGUY@xxxxxxx>FIFTYGUY@xxxxxxx

In a message dated 9/23/05 3:16:34 PM Eastern Daylight Time,
<mailto:tesla@xxxxxxxxxx>tesla@xxxxxxxxxx writes:

>Yes, the reverse diode is *absolutely* required for a DRSSTC.  You
>need an ultrafast recovery diode, and typically one rated similarly
>to the IGBTs being used.

     For a while, wasn't the consensus that external diodes were a
requirement? To not trust merely the internal diodes alone? Or is
this not an issue with the IGBT's used now?

-Phil LaBudde