T
thanks, for the idea, this would be great if there were off-the-shelf cradle mountings for the individual torroids, otherwise we would be stuck with having to custom mount all those torroids.How about winding three of these cores individually for 60uH and connecting then electrically in series ?
Its inefficient with regard to total wire length (and copper loss) but it would be an entirely practical solution that would take up hardly any extra board space.
The suggestion seems to overlook the difference between the series connection of three uncoupled versus three coupled inductors.How about winding three of these cores individually for 60uH and connecting then electrically in series ?
thanks, I am trying to work out how you would couple the three torroids.The suggestion seems to overlook the difference between the series connection of three uncoupled versus three coupled inductors
Yes. But a larger core produces the same inductance with less copper.Three inductors in series produces three times the inductance.
thanks for showing these Micrometals torroids, i must admit I tried to do it with one T30-66 and it saturates, then tried T30-M125 and it again saturates. I couldn't find T300-52 at first, but now have , so will try it.T300-52
There are no larger Kool Mu cores, which is why he needs to stack three together.Yes. But a larger core produces the same inductance with less copper.
Its inefficient with regard to total wire length (and copper loss) but it would be an entirely practical solution that would take up hardly any extra board space.
I cant find a ferrite E core big enough for the 39 Amps peak current, and 180uH.
We have calculated that the only way we an do it (using the smallest core) is to use two pieces of 77615A7 kool mu stacked, and then wind 39 turns round this, to give 180uH.Is this a result from consulting Mag-Inc's H/W support or using their software or trial and error?
If you use average current mode control, it should not affect your PF so long as the bandwidth of the current control loop bandwidth is high enough (aim for 3kHz or higher). When designing the compensation for the current control loop, assume that the inductance is at its minimum, to be safe.Will this effect operation of the PFC stage at all. I can’t think it will but just wondering on the off chance.
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