Otto`s replication of Steven Mark`s TPU

[Motorcoach1]

my supplyer said 26 buks but he uses them in his lazer units so i'ts less mmmm good deal

[otto]

Hello all,

@Tishatang

I exactly remember your birthday. Thanks a lot for your offer but 2 nice guys from this forum bought me already a scope. In a few days it will be here. Thanks again.

Otto

[Motorcoach1]

OTTO that 's  great on the scope , mines stiil done in but looking for a new one , looking for ad older tetronoks 60 unit , but life is good  best wishes ..

[turbo]

Hi Otto,

i am currently trying to devellop a 3D image of your coil.
This takes some time and i am a little bit confused about the wing design.

So i will post what i made so far , and i will change anything which is not good.
If you can tell me what's wrong with the image i can change it so we will eventually end up with the good 3D drawing.

This is the look so far and i will add the coils later when the image is correct.
Marco.

[MeggerMan]

Hi All,
To work out how much power is used at turning on/off the mosfet you can use this calculation I found:
Mosfet input power usage calculations:
P = 2 x 1/2 x C x V x V x f

P=power in watts
C=input capacitance (Ciss) of mosfet gate in Farrads
V=supply voltage
f=Frequency in Hz

So for the IRFU3707Z mosfet (has a gate capacitance of 1150pf) running at 12v and 300KHz:

P = 1150 x 10^-12 x 12^2 x 300000
P = 0.05 watts

In summary the lower the gate capacitance of the mosfet the less power wasted and the faster the rise/fall time.
I'm sorry if I sound like I am ranting on a bit but I feel I need to convey as much info as possible to help people with component choice.
Another mosfet to consider BSC042N03S
http://www.farnell.com/datasheets/90464.pdf
Rds On 4.2 mOhms Vds 30V current 50A

Regards
Rob