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-   -   I super need 12V to +-85V 20A POWER SCH (http://www.diyaudio.com/forums/power-supplies/213954-i-super-need-12v-85v-20a-power-sch.html)

hd1052bb 6th June 2012 04:41 AM

I super need 12V to +-85V 20A POWER SCH
 
I super need 12V to +-85V 20A POWER SCH

luka 6th June 2012 06:21 AM

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

RJM1 6th June 2012 07:18 AM

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

luka 6th June 2012 07:46 AM

Quote:

Originally Posted by RJM1 (Post 3049802)
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

DCPreamp 10th June 2012 07:12 PM

Schematic for a similar SMPS
 
1 Attachment(s)
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.

hd1052bb 10th June 2012 11:59 PM

very thank thank thank thank

Hadighorbani 17th July 2012 02:19 AM

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.

m2fc 22nd July 2012 05:09 AM

u can use this circuit,but you have to modify this circuit

kimbal 24th July 2012 11:11 AM

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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