Uni SMPS

[Acca]

There's my universal smps from parts from pc power supply.If it don't start to oscillate,reverse feedback windings (15k resistor).I'll test it on some amps,and it works great.PCB is without rectifier,I'll finish it later.

 

[Sorento]

Question: EE33 transformer is from pc power supply too ? don't they have more like 3.3 / 5 / 12 V output rather than 28/0/28 ?

 

[Acca]

Yes,not rewounded,this transformer give +-28V and +-11V , because duty is ~2x50%

 

[Acca]

Full bridge,1kW:

 

[Riff]

Full bridge,1kW:

its real can produce 1kw?
what driver you are suggest?
sorry my english.

 

[Acca]

Yes it can produce 1kW,driver EE-EI16/19

 

[Acca]

It doesn't produce 1kW on single ee33 but with two of these,it can.
And sorry for bad english

 

[Elvee]

Resistors or reverse connected diodes seem to be missing between B and E of the transistors (unless they are integral to the components used).

Without them, the charge on the coupling caps cannot be reset, and the converter will only be able to provide a small output.

 

[Acca]

This is not right,i tested it,with diodes it doesn't working properly,(smaller frequency and dead time,transistors blow up)

 

[Elvee]

Then the charge balance is ensured through some parasitic mechanism, probably B-E breakdown. The 330K's are much too large to provide the average base current.

 

[Acca]

330k is for bias,charge reset-->EB junction

 

[tjako]

Full bridge,1kW

Full bridge,1kW:

Acca, is this your project or someone else's example did you?
Cheers

 

[Riff]

Full bridge,1kW:

with no feedback... whether the drop voltage will not happen?
or...how your suggestion
regards.

 

[naf]

with no feedback... whether the drop voltage will not happen?
or...how your suggestion
regards.

Drop will happen but if you make a good transformer... drop was smaller than 50hz transformer on heavy load.

 

[Acca]

This is not good SMPS.I have much better one,with short circuit prot.Here's schematic:

 

[gev]

Thanks @Acca