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psu step up advice required
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Old 16th January 2020, 08:31 AM   #1
goodguys is offline goodguys  United Kingdom
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Default psu step up advice required

Hi. Is there any way to convert a 12 volt dc power supply to + 20/-20 dual symmetrical

I have an amp which needs +/- 19-23 volts dual symmetrical psu 1500watts, which is going to be expensive but i have a quality pc atx corsair 1500 watts single 12 volts dc supply and am wondering if this can be modified and used.

Any advice most gratefully appreciated. Many thanks
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Old 16th January 2020, 08:48 AM   #2
Tromperie is offline Tromperie  Australia
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Location: Melbourne
Is this for a public address system or a concert? Otherwise, why do you need that much power?
Source: LMS 7.9.2 on FreeNAS, PiCorePlayer * Storage: FreeNAS 11 * DIY PGA2310 * Amps: 8 x LM3886TF
Xover: 24dB @ 300 and 3kHz * Speakers: CNC cut 54 laminations * SB 10", SB 5", VIFA 1" * Remote: Squeeze Control
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Old 16th January 2020, 02:30 PM   #3
FauxFrench is offline FauxFrench  France
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Location: The mountains, calm and quiet.
You can convert almost any voltage into any other voltage as long as you have sufficient power, but it can be very cumbersome and expensive.
For a start, an amplifier being supplied with +/-19-23V and consuming 1500W is operating a VERY low impedance load. Are you really sure this power level is right?
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Old 16th January 2020, 02:37 PM   #4
picowallspeaker is offline picowallspeaker  Italy
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Most of car audio amplifiers utilize a SMPS/PWM to do that from the battery voltage.
The hard thing to DIY is the step-up transformer
Many mosfets (or darlington Bjt ) in push pull or SE, driven by some IC > optoisolator for Vref

( I remember from the magazines such Elektor, in the late '80s)
It's like learning sex during the Victorian era: you get to the wedding night and there are many things to do that you never imagined.
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Old 16th January 2020, 05:22 PM   #5
Osvaldo de Banfield is offline Osvaldo de Banfield  Argentina
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Location: Barrio Garay,Almirante Brown, Buenos Aires, Argentina
IMHO the best way is to build a SEPIC+Cuk converter. Isolated (In the sense that id the switch fails shorted, doesn't destroy the load) and very well tracking. No ground isolating.
Osvaldo F. Zappacosta. Electronic Engineer UTN FRA from 2001.
Argentine Ham Radio LW1DSE since 1987.
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