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Old 27th April 2013, 12:03 PM   #1
Acca is offline Acca  Serbia
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Lightbulb Uni SMPS

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.
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Old 29th April 2013, 08:43 AM   #2
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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 ?
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Old 29th April 2013, 01:55 PM   #3
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Yes,not rewounded,this transformer give +-28V and +-11V , because duty is ~2x50%
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Old 29th April 2013, 01:59 PM   #4
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Full bridge,1kW:
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Old 1st May 2013, 01:40 AM   #5
Riff is offline Riff  Indonesia
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Quote:
Originally Posted by Acca View Post
Full bridge,1kW:
its real can produce 1kw?
what driver you are suggest?
sorry my english.
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Old 1st May 2013, 06:30 AM   #6
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Yes it can produce 1kW,driver EE-EI16/19
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Old 1st May 2013, 06:32 AM   #7
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It doesn't produce 1kW on single ee33 but with two of these,it can.
And sorry for bad english
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Old 1st May 2013, 07:23 AM   #8
Elvee is offline Elvee  Belgium
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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.
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Old 1st May 2013, 04:55 PM   #9
Acca is offline Acca  Serbia
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This is not right,i tested it,with diodes it doesn't working properly,(smaller frequency and dead time,transistors blow up)
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Old 2nd May 2013, 12:55 PM   #10
Elvee is offline Elvee  Belgium
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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.
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