I super need 12V to +-85V 20A POWER SCH - diyAudio
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Old 6th June 2012, 04:41 AM   #1
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Default I super need 12V to +-85V 20A POWER SCH

I super need 12V to +-85V 20A POWER SCH
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Old 6th June 2012, 06:21 AM   #2
luka is offline luka  Slovenia
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I would say push pull, just big enough to do what you need... btw, you are talking about several kw of power, that might need 4-8 transformers, 2 fets min. per trafo, 2-4 diodes per trafo

I mean, this will cost you a good deal of money just to have parts, a lot of it in copper wire
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Old 6th June 2012, 07:18 AM   #3
RJM1 is offline RJM1  United States
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With 100% efficiency you would need to draw 283 amps from your 12V supply. You would need a 000 or larger gauge wires to connect to your 12V source.
American Wire Gauge table and AWG Electrical Current Load Limits with skin depth frequencies

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Old 6th June 2012, 07:46 AM   #4
luka is offline luka  Slovenia
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Quote:
Originally Posted by RJM1 View Post
With 100% efficiency you would need to draw 283 amps from your 12V supply. You would need a 000 or larger gauge wires to connect to your 12V source.
American Wire Gauge table and AWG Electrical Current Load Limits with skin depth frequencies
not 100% correct, you don't know the use of the suppy just yet, worst case... yes that would be about right, but you wouldn't need 000, 00 would be enough IMO
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Old 10th June 2012, 07:12 PM   #5
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Default Schematic for a similar SMPS

Attached is a schematic for a SMPS with ratings close to what you're looking for. It was for an 800WRMS car amplifier. It's a 1.5KW switching supply switching 12V up to +/- 68VDC. It could pull 150A continuously, but was mostly designed for intermittent duty associated with audio signals.

All this power was switched through a single 3C81 Ferroxcube toroid core. Of course, this was an older supply using bipolar's as switch devices. I built a similar supply delivering 1.4KW, but I used MTP50N05 FETs forgoing the driver transformer.

For your needs, you would probably need two identical, comparable power supplies with each rated for 12V @ 150A switching to 80VDC @ 20A. Then connect the two supply outputs in series to get your desired +/- voltages.

It would be a monster of a supply, but can definitely be done.
Attached Files
File Type: pdf 8002 PS.pdf (55.6 KB, 282 views)
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Old 10th June 2012, 11:59 PM   #6
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very thank thank thank thank
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Old 17th July 2012, 02:19 AM   #7
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hello dear friend
my name is Hadi from iran
i want to creat my own car amplifier but can not to creat smps for that.
i see in diy site you do that in past.
can you please help me to creat a good smps?
sory for my bad english
my email adress is Hadi_ghr_e_61@hotmail.com
very thanks for your helping.
have a nise day dear friend.
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Old 22nd July 2012, 05:09 AM   #8
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u can use this circuit,but you have to modify this circuit
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Old 24th July 2012, 11:11 AM   #9
kimbal is offline kimbal  Australia
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Might I suggest a simpler approach to all this.
Get yourselves some 12volt solar inverters designed for 50 cycles operation and use those. A company in Queensland Australia called Latronics Sunpower makes 7Kw inverter using a PIC driving some 24 Mosfets on a small ( for 7KW ) heatsink.
Because the Mos-Gate FETS run so efficiently (about 98%), due to the low Source-Drain on resistance, they don't need a massive heatsink for continuous use - unlike bipolar devices.
The output transformer is a standard 24volt centre tapped - 240 volt toroid ( power transformer ); rated at 7KW. You would need to rewind the toroid to the voltage you need.

Your second choice is adapt a UPS from an old computer. Rip out the 12 volt battery and use that point as your 12 volt input source. Take your output from the 240 volt end.

Choice 3 is buy, or build one from a conventional parts - as I did back in the late 1970s for a 200 RMS watt car amp.
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Last edited by kimbal; 24th July 2012 at 11:16 AM.
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