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Re: DRSSTC question
- To: tesla@xxxxxxxxxx
- Subject: Re: DRSSTC question
- From: "Tesla list" <tesla@xxxxxxxxxx>
- Date: Fri, 23 Sep 2005 13:08:39 -0600
- Delivered-to: testla@pupman.com
- Delivered-to: tesla@pupman.com
- Old-return-path: <vardin@twfpowerelectronics.com>
- Resent-date: Fri, 23 Sep 2005 13:11:11 -0600 (MDT)
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Original poster: Steve Ward <steve.ward@xxxxxxxxx>
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. But really, the diode could probably have
half of the average current rating of the IGBT and do ok. The peak
rating should be good (which most diodes do have very high peak
ratings). The diodes might only conduct for a small portion of each
RF cycle, and will also conduct many full cycles at the end of the
driving period as unused energy is full-wave rectified back to the
filter capacitors.
The RURG8060 from Fairchild semi looks like a pretty tough diode,
probably big enough to handle most ameture DRSSTC work. Might also
want to look at the RHRG5060, which has a slightly faster recovery time.
Steve
On 9/23/05, Tesla list <<mailto:tesla@xxxxxxxxxx>tesla@xxxxxxxxxx> wrote:
Original poster: dwb <<mailto:dwb@xxxxxxxxx>dwb@xxxxxxxxx>
When building the bridge drive circuit using igbt's which do not have an
internal antiparallel diode,is it necessary to add one externally?If
required,what are some recommended part numbers?
Don