hello friends,
I did different changes to my circuit.I got various results due to the changes
these are the waveforms
1.without snubber
2.without output inductors
3.with erro
4.without pre caps 780u inductor
5.without pre caps 47u inductor
6.without pre caps commonmode choke
7.1A load 47u inductor
8.1Amp load 780u inductor
So I believe it is easy to you identify the problem of this circuit.
if you identify the problem,pleas tell me what are the actions to resolve this
If you couldn't identify the problem please tell me what is the most suitable
waveform.
I'm waiting for your reply
Thank you.
I did different changes to my circuit.I got various results due to the changes
these are the waveforms
1.without snubber
2.without output inductors
3.with erro
4.without pre caps 780u inductor
5.without pre caps 47u inductor
6.without pre caps commonmode choke
7.1A load 47u inductor
8.1Amp load 780u inductor
So I believe it is easy to you identify the problem of this circuit.
if you identify the problem,pleas tell me what are the actions to resolve this
If you couldn't identify the problem please tell me what is the most suitable
waveform.
I'm waiting for your reply
Thank you.
Good job Dinithm, there is a lot to look at here.
I labeled two of your pictures to show what part of the waveform is leakage inductance and what part is an inductive spike that i think is from your output inductor.
Usually the snubber goes across the transformer windings. I see you put it after the diodes and it does seem to work well. I can also see that putting it after the diodes it has some interaction with the output inductor. Your snubber looks the most effective right after the diodes.
The best output inductor is the 780uH = .780mH. As i said in my last post you should have at least 2.3mH = 2,300.00 uH. As you increase the uH your wave form looks better.
Your 680n caps look like they do a good job of killing the high frequency ringing.
To sum things up, pic number 8 looks the best. But you should put the 680n caps back in and increase inductance to 2.3mH. Also as a minimum put at least two 1000uF caps on each output, for a total of 4 caps in your circuit. Or better yet three 1000uF on each output for a total of 6 caps.
I labeled two of your pictures to show what part of the waveform is leakage inductance and what part is an inductive spike that i think is from your output inductor.
Usually the snubber goes across the transformer windings. I see you put it after the diodes and it does seem to work well. I can also see that putting it after the diodes it has some interaction with the output inductor. Your snubber looks the most effective right after the diodes.
The best output inductor is the 780uH = .780mH. As i said in my last post you should have at least 2.3mH = 2,300.00 uH. As you increase the uH your wave form looks better.
Your 680n caps look like they do a good job of killing the high frequency ringing.
To sum things up, pic number 8 looks the best. But you should put the 680n caps back in and increase inductance to 2.3mH. Also as a minimum put at least two 1000uF caps on each output, for a total of 4 caps in your circuit. Or better yet three 1000uF on each output for a total of 6 caps.
Attachments
now this power supply circuit is Ok.
https://www.youtube.com/watch?feature=player_detailpage&v=HYEEU9UEhbw
I'm thank full to everyone to help me, specially powerbob.
thank you !!!!!
https://www.youtube.com/watch?feature=player_detailpage&v=HYEEU9UEhbw
I'm thank full to everyone to help me, specially powerbob.
thank you !!!!!
the circuit in the schematic produces a pwm or just produces a square wave with a full duty cyle? i mean if the inverting input below 2.5 volts it produces a full duty and if inv input is above 2.5 volt it produces zero duty ?friends thanks for helping.
I tried your idea,insert a LC filter,
first 22uh no good result then 470uh same result
this is the circuit
I think
leakage inductance of transformer is the matter
Isolated Power Supply Is Suitable For Telecom/Datacom Applications - Application Note - Maxim
how to reduce leakage inductance from transformer
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