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Registered Member #54655
Joined: Thu Mar 19 2015, 05:56PM
Location: BC, Canada
Posts: 82
I have had very good results using FGA60N65SMD in a half bridge at 400 kHz. Gate drive chip is a single UCC27425P which is inverting and non inverting so you only need one. The GDT is 15 turns trifilar.
Registered Member #58280
Joined: Sat Jan 09 2016, 06:48AM
Location:
Posts: 43
It's funny I have the whole thing planned and ready to built, yet the one thing that I can't seem to find closure with is the secondary aspect ratio.I am using 32 AWG on a 3.5" diameter form. The two options I can't really seem to decide between are:
10" winding for 1040 turns and H/D ratio of 2.86:1
8" winding for 833 turns and H/D ratio of 2.3:1
Or something even shorter, around 5" for a H/D ratio near the golden ratio.
Q is 212, toroid is 2.25"*8"
I'm at odds because the 10" has a pretty high H/D ratio, while the 8" is simply shorter; will the 10" universally give better performance. Plus, though this reason is pretty vain, I think the lower aspect ratio looks more aesthetically pleasing.
FWIW I've found very little impact of the H:W ratio in my SSTCs. I think TwirlyWhirly555 can confirm this has he has an array of very low ratio coils which perform equally as well.
My biggest coil is 4" (ID) pvc with 18" of 30ga winding.
The main observed effects of ratio in SSTCs is just the EM field effects of the topload and the coupling of the primary. If the secondary is shorter the topload's e-field has more effect on the secondary coil's field (and can potentially be seen as a shorted turn to the primary's field if close enough). Also, the primary would have a higher coupling as it now has a greater degree of intersection with the secondary.
The main limiting factors are then eddy currents and the related coil heating, and unwanted arcing at undesirable places.
Registered Member #46164
Joined: Wed May 07 2014, 08:16AM
Location: California, USA
Posts: 89
ZakWolf wrote ...
Justin wrote ...
It seems the IRFP460 is so popular because they're seen in all of these old designs.
FCA47N60 will work great.
WUT? Thats a terrible choice
We were talking about the IRFP460, not the IRFP260N which is only rated for 200V which wouldn't be suitable for this project. Both of them are really old and there are much better options available.
The FCA47N60 is a great choice, albeit an expensive one. He could just as easily use some FGH40N60 or FGH60N60 IGBTs if he wanted to.
Registered Member #58280
Joined: Sat Jan 09 2016, 06:48AM
Location:
Posts: 43
Ended up using the FGH40N60 IGBTs @ 400kHz. Loneoceans reports good results at these frequencies with them. It's pretty amazing how far IGBTs have come along, I remember 6 or so years ago when I first got interested IGBTs were pretty much sub 250kHz.
Registered Member #3114
Joined: Sat Aug 14 2010, 08:33AM
Location:
Posts: 608
Justin wrote ...
ZakWolf wrote ...
Justin wrote ...
It seems the IRFP460 is so popular because they're seen in all of these old designs.
FCA47N60 will work great.
WUT? Thats a terrible choice
We were talking about the IRFP460, not the IRFP260N which is only rated for 200V which wouldn't be suitable for this project. Both of them are really old and there are much better options available.
The FCA47N60 is a great choice, albeit an expensive one. He could just as easily use some FGH40N60 or FGH60N60 IGBTs if he wanted to.
I just happened to be looking at at 250 it was not ment to be the 460 mosfet. With that being said The FCA47..POS has 10x on and off time 3x the rise and 2x the fall. The irf460 is just a bit slower the the 250. not sure what you guys are talking about
Registered Member #58280
Joined: Sat Jan 09 2016, 06:48AM
Location:
Posts: 43
I'm thinking about using the IXY614 gate driver due to it's RF drive ability (up to 8Mhz) simple package, and high current rating. (14A)
The problem is that only the non-inverting flavor has an enable pin. Am I missing something? Why would the inverting flavor not have an enable pin option?
Also Zak has me confused. Look at the FCA MOSFET, doesn't that have a switching time 10 times longer than the IGBT?
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Fullbridge SSTC Design Questions
