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Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
I now have a running sstc driver, but the new mosfets i got keep dying even though they are far below there ratings. I would like to trade something for some irfp460's. I do not know what could trade, just PM me with a request within reason, and i will consider. If you have some irfp460's, we can work something out. I also need maybe 2 or 4 MUR860 diodes.
I have no money, i have no way to make money, and my parents will not give me a few bucks to buy my own. I do not want to have to wait until lawns need mowing again to buy some.
I can trade a working 6kv 30ma nst, or other electronics that i have just sitting around.
EDIT: I also have 2 SCR's, 1kv each and 65/70 amps continuous or 950 amps for a 10ms pulse. Good for smaller capacitor bank SCR. I also have some hardware(acorn nuts, washers, and threaded rod) for RSG's and i can cut 5/8th inch plywood rsg disks with a hole saw to needed diameter. I even have a small tesla coil secondary, 1 inch diameter with about 500 turns. I have small bug zapper transformers that are good for an inch or two of sparks for a tiny tesla coil.
Registered Member #1819
Joined: Thu Nov 20 2008, 04:05PM
Location:
Posts: 137
Would IGBTs work for your project? I have plenty that I ordered before I learned that their ratings were completely unnecessary. They are 600V 70A (from what I remember; I can't remember the part number). As soon as I find the part number, I'll post again with complete specs / PDF. Also, I have FFP08S60STU Fairchild Stealth2 diodes that could substitute for the MUR860. And if that's not enough for the diode, I have FFP30S60STU diodes, which is the same but with 30A current capacity.
I would be willing to trade for the SCRs and possibly the transformer.
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
killah573 wrote ...
Would IGBTs work for your project? I have plenty that I ordered before I learned that their ratings were completely unnecessary. They are 600V 70A (from what I remember; I can't remember the part number). As soon as I find the part number, I'll post again with complete specs / PDF. Also, I have FFP08S60STU Fairchild Stealth2 diodes that could substitute for the MUR860. And if that's not enough for the diode, I have FFP30S60STU diodes, which is the same but with 30A current capacity.
I would be willing to trade for the SCRs and possibly the transformer.
I would much prefer mosfets as they have higher freq quite often and IGBT's are way overrated. Also, do they not require higher gate driver current? My 12v .5amp regulator could not handle that.
Banned on 3/17/2009. Registered Member #487
Joined: Sun Jul 09 2006, 01:22AM
Location:
Posts: 617
Arcstarter wrote ...
killah573 wrote ...
Would IGBTs work for your project? I have plenty that I ordered before I learned that their ratings were completely unnecessary. They are 600V 70A (from what I remember; I can't remember the part number). As soon as I find the part number, I'll post again with complete specs / PDF. Also, I have FFP08S60STU Fairchild Stealth2 diodes that could substitute for the MUR860. And if that's not enough for the diode, I have FFP30S60STU diodes, which is the same but with 30A current capacity.
I would be willing to trade for the SCRs and possibly the transformer.
I would much prefer mosfets as they have higher freq quite often and IGBT's are way overrated. Also, do they not require higher gate driver current? My 12v .5amp regulator could not handle that.
In short, mosfets are the way to go :)
That statement is a little too general to be accurate. IRfp450's and 460 are frigging ancient fets and are pretty slow compared to some. IGBT's could replace FETS in most applications. IRFP450's actually came in to-3 cases too, That's how old they are. IRFP460's have a .270MOHM gate resistance which isn't all that great if you wanna get picky. Your .5 amp regular would be fine with either. It's pulsed current. When some of my earlier SSTC kept blowing fets i switched to IGBT's and never regretted it. If I was you I'd wait for the data sheet and if the IGBT's hes offering aren't ancient then go for it. They will most likely work better. See example here. this SSTC uses IGBT's and cant be killed. In fact look at the video description.
EDIT: If in fact you are still looking for Mosfets I have a set I can donate to you. I've got quite a few different ones to choose from. I Have two types that are sot-227, two to-247's another that's I think a super to-247 and a some super to-220's. the last two don't have mounting holes on them but are insulated from the metal tab. I will gather a list and post here when I gEt home tonight.
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Tom540 wrote ...
Arcstarter wrote ...
killah573 wrote ...
Would IGBTs work for your project? I have plenty that I ordered before I learned that their ratings were completely unnecessary. They are 600V 70A (from what I remember; I can't remember the part number). As soon as I find the part number, I'll post again with complete specs / PDF. Also, I have FFP08S60STU Fairchild Stealth2 diodes that could substitute for the MUR860. And if that's not enough for the diode, I have FFP30S60STU diodes, which is the same but with 30A current capacity.
I would be willing to trade for the SCRs and possibly the transformer.
I would much prefer mosfets as they have higher freq quite often and IGBT's are way overrated. Also, do they not require higher gate driver current? My 12v .5amp regulator could not handle that.
In short, mosfets are the way to go :)
That statement is a little too general to be accurate. IRfp450's and 460 are frigging ancient fets and are pretty slow compared to some. IGBT's could replace FETS in most applications. IRFP450's actually came in to-3 cases too, That's how old they are. IRFP460's have a .270MOHM gate resistance which isn't all that great if you wanna get picky. Your .5 amp regular would be fine with either. It's pulsed current. When some of my earlier SSTC kept blowing fets i switched to IGBT's and never regretted it. If I was you I'd wait for the data sheet and if the IGBT's hes offering aren't ancient then go for it. They will most likely work better. See example here. this SSTC uses IGBT's and cant be killed. In fact look at the video description.
EDIT: If in fact you are still looking for Mosfets I have a set I can donate to you. I've got quite a few different ones to choose from. I Have two types that are sot-227, two to-247's another that's I think a super to-247 and a some super to-220's. the last two don't have mounting holes on them but are insulated from the metal tab. I will gather a list and post here when I gEt home tonight.
:O I just killed two more fets due to something unexplained, and ucc's so if you give me spare mosfets :O. If you want something in exchange, i can try to find something. The most valuable things i have are the SCR's. I am broke like a joke.
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Electroholic wrote ...
instead of replacing fets, you should figure out why they were killed in the first place...
Well it shorted the last time because i turned the interrupter, driver, and halfbridge on at the same time, i guess. Doesn't make much sense to me, but this is the first time it happened. I am not killing mosfets often at all anymore. Yesterday i ran it for a few hours in all (1-2 anyway). It ran for about 30 minutes without dying continuous. I am fairly certain i did something wrong when it died though, as it is just a lashup right now.
@Tom If you'd like anything that i have, i will trade for a few mosfets. I hate to have to sound desperate, but i am trying to find yard work and in a few months i will be looking for jobs, as i turn 16 May 11th. Just send me a PM and perhaps we could work out some sort of trade?
Banned on 3/17/2009. Registered Member #487
Joined: Sun Jul 09 2006, 01:22AM
Location:
Posts: 617
Arcstarter wrote ...
Electroholic wrote ...
instead of replacing fets, you should figure out why they were killed in the first place...
Well it shorted the last time because i turned the interrupter, driver, and halfbridge on at the same time, i guess. Doesn't make much sense to me, but this is the first time it happened. I am not killing mosfets often at all anymore. Yesterday i ran it for a few hours in all (1-2 anyway). It ran for about 30 minutes without dying continuous. I am fairly certain i did something wrong when it died though, as it is just a lashup right now.
@Tom If you'd like anything that i have, i will trade for a few mosfets. I hate to have to sound desperate, but i am trying to find yard work and in a few months i will be looking for jobs, as i turn 16 May 11th. Just send me a PM and perhaps we could work out some sort of trade?
Thanks alot guys.
You might need to add some turns to your primary just to be on the safe side. Fets are super easy to kill in SSTC's which I'm sure you know.
You don't need to send me anything. Alot of what I have I got for free from the recycle bin at my old job. I sure miss that damn thing. I gathered a list, a few I only had a few of so I'll save those. There were about 12 types some I didn't even know I had. There are to-247, isotops, super to-247, super to-220 and I believe a an iso to-247 which I think is the same as the super to-247. Pick one type and I'll send you 4 or so of them. The ones I thought would be good for you coil are:
IXFN50N50 and IXFN55N50 <--ISOTOP IRFPS40N60K <--super to-247 IRFP27N60P <---to-247 Just like IRFP460 but slightly higher current handling and speed. IRFP450 IXFR48N50 <--super to-247 I also have some weird APT FETS that are designed for linear operation in ISOTOP package.
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Tom540 wrote ...
Arcstarter wrote ...
Electroholic wrote ...
instead of replacing fets, you should figure out why they were killed in the first place...
Well it shorted the last time because i turned the interrupter, driver, and halfbridge on at the same time, i guess. Doesn't make much sense to me, but this is the first time it happened. I am not killing mosfets often at all anymore. Yesterday i ran it for a few hours in all (1-2 anyway). It ran for about 30 minutes without dying continuous. I am fairly certain i did something wrong when it died though, as it is just a lashup right now.
@Tom If you'd like anything that i have, i will trade for a few mosfets. I hate to have to sound desperate, but i am trying to find yard work and in a few months i will be looking for jobs, as i turn 16 May 11th. Just send me a PM and perhaps we could work out some sort of trade?
Thanks alot guys.
You might need to add some turns to your primary just to be on the safe side. Fets are super easy to kill in SSTC's which I'm sure you know.
You don't need to send me anything. Alot of what I have I got for free from the recycle bin at my old job. I sure miss that damn thing. I gathered a list, a few I only had a few of so I'll save those. There were about 12 types some I didn't even know I had. There are to-247, isotops, super to-247, super to-220 and I believe a an iso to-247 which I think is the same as the super to-247. Pick one type and I'll send you 4 or so of them. The ones I thought would be good for you coil are:
IXFN50N50 and IXFN55N50 <--ISOTOP IRFPS40N60K <--super to-247 IRFP27N60P <---to-247 Just like IRFP460 but slightly higher current handling and speed. IRFP450 IXFR48N50 <--super to-247 I also have some weird APT FETS that are designed for linear operation in ISOTOP package.
What voltage is your coil running off?
:O Your the best (along with Dr. Spark and others). Umm i am running simple 120vcc CW in final version, so i suppose 170vdc after fullwave and cap? Right now it is only 80vac into the fullbridge to the smoothing cap of 900uf.
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Sstc Mosfets.
There were about 12 types some I didn't even know I had. There are to-247, isotops, super to-247, super to-220 and I believe a an iso to-247 which I think is the same as the super to-247. Pick one type and I'll send you 4 or so of them. The ones I thought would be good for you coil are: