Offline full-bridge SMPS… need help

[Whortless]

I think therz some error around the pin8 of IC 101
SoftStart capacitor C120 -ve end should be at ground pot pin12 of IC U101;

Yes U are right the capacitor should be connected to GND of the circuit instead of the Vref/2 way on the eror amp's + input. Thank you for your correction.

 

[Whortless]

Output Inductor values

Hi every body

I pulled the (Driving transformer version or anyway) circuit from my amplifier(240W+120+120W RMS) and looked to inductors. They are wound 22sp with 2*0.8 cu wires and the value of the inductors 22uH.
The circuit supplies my amplifier without any doubt

Please look the last 3 replies written by me.

Regards

 

[Whortless]

Hi,

Here is the half of the shematic. I draw it on multisim and therefore could not get place all the shematic in one file but will enclose the left side of the circuit. In fact it is same as IR2113 version's eror section and I think only the inputfilter section left.

Regards

 

[medogrizli]

Hi,

Here is the half of the shematic. I draw it on multisim and therefore could not get place all the shematic in one file but will enclose the left side of the circuit. In fact it is same as IR2113 version's eror section and I think only the inputfilter section left.

Regards

Whats the purpose of 2N2907 ?

 

[Whortless]

Whats the purpose of 2N2907 ?

it is for fast shut down the mosfets.

 

[sivan_and]

medogrizli wrote:

Whats the purpose of 2N2907

therz no need the zener diode will clamp the negative excursions of the driver transformer.

 

[luka]

Finally working

Yes it is complited and working on 230AC . First test was with variable resistor.Because of heat generated on it , it was driven for only few seconds.Heat dissapated for that time was 145W.
Wave forms are nice squers as they should be.

 

[medogrizli]

Re: Finally working

Yes it is complited and working on 230AC . First test was with variable resistor.Because of heat generated on it , it was driven for only few seconds.Heat dissapated for that time was 145W.
Wave forms are nice squers as they should be.

post schematics

 

[Danko]

And pictures of the completed powersupply!

 

[luka]

http://freeweb.siol.net/alecnik1/smps.jpg

 

[sivan_and]

INCOMPLETE SCHEMATIC....

 

[luka]

yes it is.There are only importing things.

here is the picture of test board

 

[luka]

This is the signal on the primary side of transformer, withe 50V/div,freq is 50kHz

 

[luka]

O and Whortless, can't wait to see your PCB.It will help me make my PCB smaller then it is now,and everything on one board only.I would like to see the one, where you use IR.
Lp, Luka

 

[luka]

lp

 

[luka]

you will need circad98 to see schematic.

 

[luka]

This is how PCB look's now.

 

[luka]

...and

 

[Danko]

ooops...
I have just fried 4 mosfets (IRF740) in my full bridge powersupply
The 0.1 R current sense resistors have exploded, and the 20A braker on the house also shut down.
I measure short circuit on each of the mosfet's legs, but (i'm surprised) the IR2113s seem to be OK.

I don't have idea, whay these FETs have died...
Maybe, the spike on the leading edge on the transformer's primary was tooooo high.

If there's interest, I can post a schematic.

 

[N-Channel]

Danko,

Please do. Tripping a 20A breaker, especially at 230VAC, that's something like 4.5+kW surging through the curcuit. Not too good...........

Regards,

Steve