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BSM25GD120DN2E 3224 IGBT IH Working!

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MinorityCarrier

Fri Sept 25 2009, 10:12PM

Registered Member #2123 Joined: Sat May 16 2009, 03:10AM
Location: Bend, Oregon
Posts: 312

Methinks he meant toroid.

Gabriel35

Sat Sept 26 2009, 12:12AM

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

Hey !
i got a picture of the IH

It's ressonant, i can heat a nail that get untouchable with 41vDC @ 7A i think it hits 300ÂºC
but the IGBT dissipators get pretty hot i think it about 60 ÂºC
it's normal?
the lines of ressonance that the cell phone camera captures are very equal, they looks like uniform lines running through the screen..
what do you think?

Thanks!

Arcstarter

Sat Sept 26 2009, 01:12AM

Registered Member #1225 Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253

At 35 volts and a few amps a ZVS LOPT driver, even though not great for induction heating, got a nail red in 11 seconds with cold IGBTs. Something is not working right i'd think. A scope would sure be helpful at this point.

teravolt

Sat Sept 26 2009, 04:33AM

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

I don't meen to dis your setup but the amount of caps in your work circuit is prity feable. Add another dozon caps in parallel with your work coil this will increase current and reduce frequecy. This will have the efect of lowering your ESR in your cap bank for grater circulating current. Right know I think your IGBT is doing all the work. When the work capacitors and coil become resonant there impedance goes up and the IGBT does less work ontill you add your work peace

Gabriel35

Sat Sept 26 2009, 02:44PM

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

ok but what abou the capacitance? it doesn't matter?
don't need to be something near 3,2uF?
because i've used the same capacitors on my previous Mazzili driver, and they heated a lot, when it was working
the caps do warm now, but just a little...
can i use some diffrent caps with diffrent capacitances just to make a test of that you said?

teravolt

Sat Sept 26 2009, 05:01PM

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

the types of caps that are used in this part of the circuit are special indeed. the industial celem induction cooled caps are the extream of this and talked about in other threads. these caps have low equivalent series resistance(ESR) and low inductance.
Tonskulus might be able to recomend caps to use better than I. All the caps and work indutor will get warm if working proerly. If you can find some polypropylene snubber such as the CDE cap that are used in the DRSSTC's, that will improve the performance. The more caps you put in parallel the lower your ESR and more current

Gabriel35

Sat Sept 26 2009, 07:42PM

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

I've added some capacitors with a poor setup but just for testing... it keeps like before, the IGBT keep heating like before.. what do you think?

teravolt

Sun Sept 27 2009, 12:16AM

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

the capacitors that you have chosen in my opinion are not the right type. hear is a website that has a great description and pictures. Can you obtain some poly snubber caps?

Tonskulus

Sun Sept 27 2009, 11:11AM

Registered Member #1223 Joined: Thu Jan 10 2008, 04:32PM
Location:
Posts: 133

Im using 14 x Plessey "KP" -type capacitors. 220nF/1000V. Very good caps for IH duty, stays cool. So far, no cap failures at all.

Another capacitor type I have been using Rifa PHE450. Warms up a little bit but seems to be ok.

However, watercooling is required. I have soldered my caps almost directly to the copper tubes (water cooled). This method keeps capacitor leads cooled.. Previously i didnt have watercooling-->Internal joints of capacitor failed because too much heat was conducted from workcoil to capacitors.

Gabriel35

Sun Sept 27 2009, 10:32PM

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

i've saw a lot of people on youtube using capacitor like mine in high power IH's...and theese caps worked on my previous Mazzili IH, i don't have acess to diffrent capacitors, and so , if this circuit only works with very specific caps i think i'll need to try other schematic or topology...
What do you think?

Thanks!

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