I have not finished watching this but I will give you the link anyway: https://www.youtube.com/watch?v=CnpqkuHU0pc Concerns degradation of SiC FETs under pulse conditions. I hope this is interesting for you. (or anyone else, for that matter)
Ping John Larkin - SiC FETs
Started by ●October 23, 2023
Reply by ●October 24, 20232023-10-24
On Mon, 23 Oct 2023 11:52:40 -0700 (PDT), John Smiht <utube.jocjo@xoxy.net> wrote:>I have not finished watching this but I will give you the link anyway: > >https://www.youtube.com/watch?v=CnpqkuHU0pc > >Concerns degradation of SiC FETs under pulse conditions. I hope this is interesting for you. (or anyone else, for that matter)That is exactly the same SiC Fet, C2M0280120D, that I use in my 1400 volt Pockels Cell driver. It has run at 4M pulses per second for months at a time, with no sign of fet degradation. It can do 1500 volt pulses, but only at 1 MHz. The fet seems to leak pretty seriously at about 1700 volts. http://www.highlandtechnology.com/DSS/T850DS.shtml https://www.dropbox.com/scl/fi/5arhyamrp0bl3tgb2fasn/DSC02771.JPG?rlkey=3ttcc2yt6s9nrtdouuv3aneol&raw=1 I'm driving the gate hard, about +18 and -10. Pulsed drain current is huge, past the specified abs max for sure. Interesting, thanks. I don't look at Youtube much any more. My ad blockers quit working and the ads are too annoying.
Reply by ●October 24, 20232023-10-24
On Mon, 23 Oct 2023 20:41:10 -0700, John Larkin <jl@997PotHill.com> wrote:>On Mon, 23 Oct 2023 11:52:40 -0700 (PDT), John Smiht ><utube.jocjo@xoxy.net> wrote: > >>I have not finished watching this but I will give you the link anyway: >> >>https://www.youtube.com/watch?v=CnpqkuHU0pc >> >>Concerns degradation of SiC FETs under pulse conditions. I hope this is interesting for you. (or anyone else, for that matter) > >That is exactly the same SiC Fet, C2M0280120D, that I use in my 1400 >volt Pockels Cell driver. It has run at 4M pulses per second for >months at a time, with no sign of fet degradation. It can do 1500 volt >pulses, but only at 1 MHz. The fet seems to leak pretty seriously at >about 1700 volts. > >http://www.highlandtechnology.com/DSS/T850DS.shtml > >https://www.dropbox.com/scl/fi/5arhyamrp0bl3tgb2fasn/DSC02771.JPG?rlkey=3ttcc2yt6s9nrtdouuv3aneol&raw=1 > >I'm driving the gate hard, about +18 and -10. Pulsed drain current is >huge, past the specified abs max for sure. > >Interesting, thanks. > >I don't look at Youtube much any more. My ad blockers quit working and >the ads are too annoying. > >Given that gigantic package, there's not much inside. https://www.dropbox.com/scl/fi/awdq53p0as92hpsznpdsx/Cree_Chip.JPG?rlkey=bu95h94p3jxbamwkn72wcswz6&raw=1
Reply by ●October 24, 20232023-10-24
On 24/10/2023 04:41, John Larkin wrote:> On Mon, 23 Oct 2023 11:52:40 -0700 (PDT), John Smiht > <utube.jocjo@xoxy.net> wrote: > >> I have not finished watching this but I will give you the link anyway: >> >> https://www.youtube.com/watch?v=CnpqkuHU0pc >> >> Concerns degradation of SiC FETs under pulse conditions. I hope this is interesting for you. (or anyone else, for that matter) > > That is exactly the same SiC Fet, C2M0280120D, that I use in my 1400 > volt Pockels Cell driver. It has run at 4M pulses per second for > months at a time, with no sign of fet degradation. It can do 1500 volt > pulses, but only at 1 MHz. The fet seems to leak pretty seriously at > about 1700 volts. > > http://www.highlandtechnology.com/DSS/T850DS.shtml > > https://www.dropbox.com/scl/fi/5arhyamrp0bl3tgb2fasn/DSC02771.JPG?rlkey=3ttcc2yt6s9nrtdouuv3aneol&raw=1 > > I'm driving the gate hard, about +18 and -10. Pulsed drain current is > huge, past the specified abs max for sure. > > Interesting, thanks. > > I don't look at Youtube much any more. My ad blockers quit working and > the ads are too annoying.I use Firefox or Pale Moon with the uBlock Origin add-on. I *never* see an advert when playing a YouTube video. As Google amends YouTube to get their ads through, so uBlock adds to its filters to stop them. Just allow uBlock to update automatically and you won't see another ad. -- Jeff
Reply by ●October 24, 20232023-10-24
On 23/10/2023 19:52, John Smiht wrote:> I have not finished watching this but I will give you the link anyway: > > https://www.youtube.com/watch?v=CnpqkuHU0pc > > Concerns degradation of SiC FETs under pulse conditions. I hope this is interesting for you. (or anyone else, for that matter)Interesting, thanks. How long before we see driver chips with built in gate leakage monitoring I wonder? piglet
Reply by ●October 24, 20232023-10-24
On Tue, 24 Oct 2023 08:49:13 +0100, Jeff Layman <Jeff@invalid.invalid> wrote:>On 24/10/2023 04:41, John Larkin wrote: >> On Mon, 23 Oct 2023 11:52:40 -0700 (PDT), John Smiht >> <utube.jocjo@xoxy.net> wrote: >> >>> I have not finished watching this but I will give you the link anyway: >>> >>> https://www.youtube.com/watch?v=CnpqkuHU0pc >>> >>> Concerns degradation of SiC FETs under pulse conditions. I hope this is interesting for you. (or anyone else, for that matter) >> >> That is exactly the same SiC Fet, C2M0280120D, that I use in my 1400 >> volt Pockels Cell driver. It has run at 4M pulses per second for >> months at a time, with no sign of fet degradation. It can do 1500 volt >> pulses, but only at 1 MHz. The fet seems to leak pretty seriously at >> about 1700 volts. >> >> http://www.highlandtechnology.com/DSS/T850DS.shtml >> >> https://www.dropbox.com/scl/fi/5arhyamrp0bl3tgb2fasn/DSC02771.JPG?rlkey=3ttcc2yt6s9nrtdouuv3aneol&raw=1 >> >> I'm driving the gate hard, about +18 and -10. Pulsed drain current is >> huge, past the specified abs max for sure. >> >> Interesting, thanks. >> >> I don't look at Youtube much any more. My ad blockers quit working and >> the ads are too annoying. > >I use Firefox or Pale Moon with the uBlock Origin add-on. I *never* see >an advert when playing a YouTube video. As Google amends YouTube to get >their ads through, so uBlock adds to its filters to stop them. Just >allow uBlock to update automatically and you won't see another ad.That seems to work. Thanks. Embedded ads, just part of the video, are easy to skip.
Reply by ●October 24, 20232023-10-24
On Tuesday, October 24, 2023 at 5:35:12 AM UTC-5, piglet wrote:> On 23/10/2023 19:52, John Smiht wrote: > > I have not finished watching this but I will give you the link anyway: > > > > https://www.youtube.com/watch?v=CnpqkuHU0pc > > > > Concerns degradation of SiC FETs under pulse conditions. I hope this is interesting for you. (or anyone else, for that matter) > Interesting, thanks. How long before we see driver chips with built in > gate leakage monitoring I wonder? > > pigletI'm pretty sure that you know that I am not even nearly qualified to answer that question. I can't even speculate on it.
Reply by ●October 24, 20232023-10-24
On Tue, 24 Oct 2023 11:35:03 +0100, piglet <erichpwagner@hotmail.com> wrote:>On 23/10/2023 19:52, John Smiht wrote: >> I have not finished watching this but I will give you the link anyway: >> >> https://www.youtube.com/watch?v=CnpqkuHU0pc >> >> Concerns degradation of SiC FETs under pulse conditions. I hope this is interesting for you. (or anyone else, for that matter) > >Interesting, thanks. How long before we see driver chips with built in >gate leakage monitoring I wonder? > >pigletProbably never. The driver shouldn't damage the fet, and if it did see leakage, what should it do?
Reply by ●October 24, 20232023-10-24
On 24/10/2023 18:00, John Larkin wrote:> On Tue, 24 Oct 2023 11:35:03 +0100, piglet <erichpwagner@hotmail.com> > wrote: > >> On 23/10/2023 19:52, John Smiht wrote: >>> I have not finished watching this but I will give you the link anyway: >>> >>> https://www.youtube.com/watch?v=CnpqkuHU0pc >>> >>> Concerns degradation of SiC FETs under pulse conditions. I hope this is interesting for you. (or anyone else, for that matter) >> >> Interesting, thanks. How long before we see driver chips with built in >> gate leakage monitoring I wonder? >> >> piglet > > Probably never. The driver shouldn't damage the fet, and if it did see > leakage, what should it do? >Assert an IRQ so the WiFi IOT device calls home AWS and Alexa hollers out: "Your wallwart is wearing out. I am selling you a new unit, the drone will be with you in 45 minutes." :> piglet
Reply by ●October 25, 20232023-10-25
On a sunny day (Tue, 24 Oct 2023 10:00:36 -0700) it happened John Larkin <jl@997PotHill.com> wrote in <qvtfji54bgceffb6t7qu6i2jla54uhkd18@4ax.com>:>On Tue, 24 Oct 2023 11:35:03 +0100, piglet <erichpwagner@hotmail.com> >wrote: > >>On 23/10/2023 19:52, John Smiht wrote: >>> I have not finished watching this but I will give you the link anyway: >>> >>> https://www.youtube.com/watch?v=CnpqkuHU0pc >>> >>> Concerns degradation of SiC FETs under pulse conditions. I hope this is interesting for you. (or anyone else, for that >>> matter) >> >>Interesting, thanks. How long before we see driver chips with built in >>gate leakage monitoring I wonder? >> >>piglet > >Probably never. The driver shouldn't damage the fet, and if it did see >leakage, what should it do? >Sent a voice message to your cellphone?
