New ClassD project Starting from 0

[luka]

another set of samples?! very nice!

 

[DjLeco]

Not

Not samples!
Just T400-2, was sample request, all others, buyed.

 

[luka]

so how much did cost you last order?

 

[DjLeco]

Around

Around 300 Euros

 

[dexter2003]

Around 300 Euros

Nothing new??

 

[DjLeco]

Not yet, some little family problems, keept me away from it...

Soon, I'll be back, with results!

 

[savu]

Use this configuration for the best results - opto/driver/floating smps. It is best for versatility, construction, hard clipping, etc.
Also, you can use EE 3f3 gapped (easy to find). Dont ignore deadtime and feedback construction.

hello ionut, can you attach a bigger picture of that PCB, i can't read the values on it

best regards

 

[savu]

Luka!
Is this a serious question? Cross-section (=area) of circle is A=d^2*pi/4 = 0.08*0.08*3,14/4=0.005 mm^2 (=> total area of 1 mm^2).

Hello Pafi,

I have 40x0.08mm homemade litzwire. That means that total diameter is 40*0.08 = 3.2mm thus, 3.2*3.2*3.14/4=8.03mm^2
BUT if i calculate on only one 0.08 wire and multiply by 40:
0.08*0.08*3.14/4=0.005mm^2*40=0.20mm^2

so witch is the correct way to calculate the area of a litzwire inductor

Best regards,

 

[jej]

Hello Savu,
It's the second method of course
Regards

 

[savu]

To JEJ:

Taught so to, thank you for clarifiing.
Now the other stupid question:
What is the amount of amps that can be drawn from 0.20mm^2 in a 50KHz smps?

I am building SMPS and I don't have litzwire so I have to make it myself.

Regards,

 

[ericbrooking]

...
Everything happening at source inductance appears at the gate too, but this may be actually useful because parasitic resonances may be damped indirectly to some extent with very low dissipation through the gate, and damping the rest directly on the switching node becomes much easier...

Hi Eva,
This is interesting, are you talking about something fancier than just slowing down the gate? In my mind I started seeing little tank circuits on the gate to tame big problems on the power side. But won't this cause trouble with your compensation? Maybe I took this too far🙂

 

[jej]

Savu,

For a SMPS's transormer at 50KHz you must take into account the skin effect. The formula is 66/(F)^0,5 with F in Hertz
The current density is about 4 to 6A by mm^2.
For example at 50 KHz you can use a diameter of 0,3mm for your wire corresponding to 0,068mm^2 and use 14 x 0,3mm if you have a current of 6A
Note this is the rms current!
What is your topology?

 

[savu]

Jej:

My topology is HalfBridge.

I redone the transformer winding last night:
200x0.08MagnetWire for primary = 1.02mm^2 (Vin is 150V@50Khz)
100x0.08MagnetWire for secondary = 0.51mm^2 (Vout is 320V rectified)

Regards,

 

[zivojinn]

info

Hello everyone, I'm new here, so we still do not know how everything works, or whether they would live to tell me a replacement for transistors and 2sk175 2sj55 or that the housing TO-264.Thanks advance.