SMPS calculations

[mahmood]

Hi all :
Did any one used this web site for smps calculation befor ?
my smps properties :
input = 315 volt max
out put = 600 volt
I out = 200 mA
Design of switch power supplies
And can i trust to the result values that this web give to me ?

[event horizon]

Looks pretty good to me However all the complex stuff has been left out - IE closing the feedback loop, output capacitance etc. I didn't see anything mentioned about switching frequency or losses due to skin effect in conductors either.

Let alone PCB design which can be a nightmare due to stray inductance

The basic stuff certainly looks ok from what i can see though

[Serge66]

Hi Mahmood,

If I may ask, what is the use of your PSU?

During the last weeks, I built a resonant SMPS with a L6599 controller (ST Microelectronics) in half-bridge configuration. It is working well. However, I have about 1V pk-pk 100Hz super-imposed on the output (450V and 225mA), plus spikes at the switching frequency. Since this is for a vacuum tube HiFi amp, I am seriously thinking of going linear.
Do you have this 100Hz problem?
Cheers,
Serge

[m-tech]

Originally Posted by mahmood

Design of switch power supplies
And can i trust to the result values that this web give to me ?

No, don't trust that site, especially for halfbridge. Number of primary turns should be twice lower than calculated.
I know that because I made this mistake, and ended up with two times lower output voltage than calculated.

What is your mains voltage ? If it's 220Vac, than your input voltage is (250-360)Vdc.

[mahmood]

Hi serge66 :
I want to make two sets of that board to supply my audio amp that is based on
STK4192II which can give me about 50W real at 6 ohm . this is my first issue i think i
can use it for another application like HV generator to make electrical ARC between two
wire etc .