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Old 14th May 2012, 06:50 AM   #81
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Quote:
Originally Posted by KatieandDad View Post
SMPS supplies often used to employ a large power resistor and a zener to provide the (eg 12V) for the electronics during start-up. Once the PSU was running, the 12V was supplied by an auxilliary winding on the output transformer. As the resistor only had to provide power for a few cycles it never really got hot.
That looks just fine, but what will happen when the SMPS enter protection mode?

Like over current protection, Thermal shutdown for 1 minute let say?

If the AUX circuit is poor, resistor wont hold too long. I never saw a good start up circuit


Good luck
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Old 14th May 2012, 02:10 PM   #82
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Point taken.

I used to let the PSU shut down completely so that you would have to investigate why it shut down.
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Old 16th August 2012, 05:00 PM   #83
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Originally Posted by jash2008 View Post
may be you can try this, it works great. I have modified this design for +-70 and tested on a 400watts amp whihout much heating. You may be required to decrease the no. turns and gauge according to your requirement

thanks
how much output it gives and can the output transformer be wound up on a feritte round(ring) core...if yes then how many turns????????????
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Old 16th August 2012, 06:43 PM   #84
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hi everyone,

you may try this design. this has a current latching shutdown as well as good regulation. i had made one for me at 35V-5A
Attached Files
File Type: pdf smps tl494.pdf (25.0 KB, 501 views)
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Old 18th August 2012, 02:02 AM   #85
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hi Mr. Manhood, can i have a copy
of your schematic in pdf format..I can't copy
the schematic you posted..thanks a lot
keep up the good works!
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Old 18th August 2012, 08:16 AM   #86
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Hi Mahmood
your computation was awesome!
can I use the ferrite core of flyback transformer of t.v. or monitor
instead of ETD49 or its variants?, because i have many of those flyback core.
Thanks a lot..regards and best wishes!
---kikodemy---
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Old 9th September 2012, 10:45 AM   #87
trowa is offline trowa  Philippines
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Quote:
Originally Posted by jash2008 View Post
Few actual photographs of the two prototypes
sir i been following this topic and im interested in your design can you please share me the files of the 2 design you already made,, i have a etd44 core i want to make +/- 40 out of it can you help me
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Old 6th October 2012, 10:42 PM   #88
os12300 is offline os12300  Mexico
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Thumbs up Hello! This project is very interesting.

Hello! newly, Excellent project, I'm interested, Please could you send me the files too?.
Thousand Thanks.
os12300@gmail.com
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Old 7th October 2012, 06:10 AM   #89
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hi jash2008

could you please post the details for gate drive transformer ie core and turns

thanks

ravs

be a vegeterian.........
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Old 7th October 2012, 06:32 AM   #90
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Quote:
Originally Posted by Kv3audio View Post
That looks just fine, but what will happen when the SMPS enter protection mode?

Like over current protection, Thermal shutdown for 1 minute let say?

If the AUX circuit is poor, resistor wont hold too long. I never saw a good start up circuit


Good luck
Can you not use a 240VAC rated capacitor as a current limiter, with a small diodebridge, smoothing cap and a zener as a shunt regulator?
It is good for up to 50-60 mA easily continuously.
(240VAC rec = 335 VDC-12V zener = 323V DC / 50 mA = 6,5 kOhm, i e the capacitors impendance @ 50Hz => ~490 nF ,say 470nF)

This will be a much more reliable supply as no power is dissipated in the cap(well almost none) and the small power factor degradation, well...

Yes, it will be a bulky cap, but still smaller than a small tranny...
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