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BSM25GD120DN2E 3224 IGBT IH Working!

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Gabriel35

Sat Oct 03 2009, 03:57AM

Registered Member #2310 Joined: Wed Aug 19 2009, 08:04PM
Location: Santa Catarina - Brazil
Posts: 169

Hi all!
Using 34x 68nF 630v now... they keep very very cool @ 110v -> 160 with filter caps, i liked a lot them , i'll post photos soon...
the question is:
with more voltage, like 220... can i get the bolt to shine more? in other words: more voltage and amperage on the inverter part, gives me more power being deposited on the bolt?
or it is just the frequency that matters?

Thanks!

Steve Conner

Sat Oct 03 2009, 08:21AM

Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706

Yes, of course more voltage = more power

Gabriel35

Sun Oct 04 2009, 10:54PM

Registered Member #2310 Joined: Wed Aug 19 2009, 08:04PM
Location: Santa Catarina - Brazil
Posts: 169

oh well!
nice!
i have one more question:
i have this IGBT module:BSM25GD120DN2E 3224

like seen on the schematic:

i'm using 4 of the 6 disponible IGBTs of my module, can i use the 6 just adding two 22R resistors to the pins 5 and 7 of the IR 2153 and more 2 10R resitors and 2 2n2 Caps?
or is better to let the 2 IGBTs that are not being used, in case of the other 4 burn?(i dont think it will happen cause they are pretty cool...)
will be any diffrence turning the 6 or just 4 like i'm using now? will it be capable of handling more current using 6?

and... someone knows the utility of that 4R7 4w resistor and that 4N7 1kv capacitor, near the transformer?

Thanks!

teravolt

Sun Oct 04 2009, 11:13PM

Registered Member #195 Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111

you can parallel the half bridges for more current

Gabriel35

Mon Oct 05 2009, 02:28AM

Registered Member #2310 Joined: Wed Aug 19 2009, 08:04PM
Location: Santa Catarina - Brazil
Posts: 169

hi again!
ok, my IH is capable of melting aluminum easily, only 20 secs, and it's melted, but i've noted that people can get screws yellow and even melt them with this power level, here i can just make the screw shiny orange, and the coil is already orange too at this point... i'm almost certain that this is related with the frequancy....

what do you think, and what do you recommend for getting yellow/white workpieces?

thanks!

teravolt

Mon Oct 05 2009, 03:58PM

Registered Member #195 Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111

1: use copper tubing and cool it.
2: more power.
do you have curren't picture to share

Gabriel35

Tue Oct 06 2009, 04:17PM

Registered Member #2310 Joined: Wed Aug 19 2009, 08:04PM
Location: Santa Catarina - Brazil
Posts: 169

hi all!
something strange happened, i shuted down the logic part before the inverter part, something failed, i think it is the IR2154 but i really don't know why...
so strange... i discovered that some IGBT of my module are dead too =//...
But i still can try it using just 2 of the 6 igbts alright?
(i didn't found a frequency specification on the BSM datasheet, maybe it is designed for low frequency, and this can be afecting the IH, (that frequency question about getting bolts yellow, that ive asked previously)
or got burned because of execive frequency, what do you think?
because, like i've said: the work coil were getting orange, and it means that a lot of current was passing through it... i've saw on some videos, when the work coil was becoming orange the workpiece was already white...
here I got some pictures of the IH when it was working, the colors are diferent, the real color was orange:

teravolt

Wed Oct 07 2009, 12:27AM

Registered Member #195 Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111

well live and lern, nice pictures. the electronics controle when the fets turn off and on so your fets probibly cross conducted. do your fets get hot during normal operation?

Gabriel35

Wed Oct 07 2009, 12:52AM

Registered Member #2310 Joined: Wed Aug 19 2009, 08:04PM
Location: Santa Catarina - Brazil
Posts: 169

Thanks!
They kept very coolwhile working """normally""", but i discovered that this power module was propably suitable for USPP aplications, in other words i think that the frequencies that it can keep are low,(the strange part is that all the internal IGBT's seems to be fried, do you think that the cross conduction done it?)
I'll search for some SMPS IGBT's that can operate on frequencies up to 200Khz in ressonant mode.
(I still think that this i the motive why the things were not getting yellow/white... low frequency)

teravolt

Wed Oct 07 2009, 03:48AM

Registered Member #195 Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111

there are 3 things that will afect your work load higher frequency, higher voltage or current. if your fets were cool than probibly every thing was ok. if you want to change F, V, or A in your circuit it will afect other parts of your circuit like increasing f means less caps or turns on L. if you use less caps to increas f you will decrease the amount of current advantage that you have. since you don't have optimal caps for this project fatter tubing and less turns might help. if you use more caps and fatter tubing you will reduce the amount of ESR in your cap bank and less resistance in L so the circulating current becomes grater. thease are the things that you will have to play with. with out the right caps for this project you will not be able to get 200khz but you can increase voltage and current.

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