Adjustable +/- 0-50V 0-5A Power Supply Schematics - diyAudio
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Old 27th July 2010, 05:59 PM   #1
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Default Adjustable +/- 0-50V 0-5A Power Supply Schematics

Hello
I need schematics for Adjustable +/- 0-50V 0-5A Power Supply.
Thank you
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Old 27th July 2010, 07:27 PM   #2
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You can look up the diagrams of some commercial units. Or design your own.

Start with a power supply that will deliver at least 55 V (at ripple troughs) at full load current of 5 A. Put in a series regulator stage, probably several transistors in parallel on a heat sink (with emitter equalizing resistors). Drive with a reverse polarity transistor.

Drive said reverse transistor with another transistor, either a differential pair or an opamp or just a single transistor. Use zener as reference, pot to control other input. Or the classic uA723.

The only problem with this approach is that it won't take the output to zero. You can devise various methods to do that if it's needed, like tying the reference to a negative supply.
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Old 28th July 2010, 04:02 AM   #3
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Depending on how much you'll be using it at low voltage and low current, I would build a forward converter, or hybrid (~60VDC supply with buck converter).

A combination switching supply with linear postregulator could work very well indeed at all voltages and currents.

Tim
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Old 28th July 2010, 04:55 AM   #4
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Default Adjustable +/- 0-50V 0-5A Power Supply Schematics

Contact by email.

I build one Adjustable +/- 0-50V 0-3A tracking Power Supply.

regards Walter
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Old 28th July 2010, 06:00 AM   #5
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Default Dual PS

Drawing and BOM

regards

Walter
Attached Files
File Type: pdf Doppelnetzteil[WB].pdf (79.5 KB, 1946 views)
File Type: pdf BOM_Doppelnetzteil WB.pdf (111.7 KB, 917 views)
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Old 28th July 2010, 07:38 AM   #6
Elvee is offline Elvee  Belgium
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This one is a single polarity 0-50V. The example shown is configured as a 0-2A, but it can be adapted to another current value by modifying R9 on the schematic.
Further down the thread, some accessories are described, such as automatic winding switching, and also the way to couple two units to make a +/-50V supply.
This circuit has the advantage of requiring no auxiliary supply.
http://forums.futura-sciences.com/pr...reference.html

Last edited by Elvee; 28th July 2010 at 07:42 AM.
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Old 3rd August 2010, 09:00 PM   #7
joaquim is offline joaquim  Sweden
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Very innovating "Lab psu", how ever there's a much easier way, use a trafo. with a secondary of 2x36 - 40VAC, a rectifier bridge, 10mF 100V cap's and a VARIAC, on the mains..... They can be hard to get, but look on e-bay.... 3A 0 - 250VAC(or 115VAC US), and the "unregulated" traf of 2x36V~, which becomes about 50VDC rectified and noise free(bigger cap = less 'hum'), and 3A times 250VAC, comes to 750VA, which ought to be enough(but you'll need a pass transistor if you wanna ctrl the current, and the circuit looked kind of tempting...)
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Old 8th August 2010, 06:15 AM   #8
dangus is offline dangus  Canada
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The LM10CH application notes include a floating lab power supply regulator. Motorola used to make a chip that was specifically designed for lab power supplies, but it's been discontinued for some time. Still, the application note may be useful since I'm pretty sure it talks about how to choose the power transistors.

Here's a power supply that recreates the Motorola MC1466 chip using discrete devices:
Super Power Supply, Current and Voltage Regulated

Last edited by dangus; 8th August 2010 at 06:20 AM.
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Old 8th August 2010, 12:28 PM   #9
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Quote:
Originally Posted by hamedfazelm View Post
Hello
I need schematics for Adjustable +/- 0-50V 0-5A Power Supply.
Thank you
For testing amplifiers I have used a Variac on a dedicated amplifier power supply -- 600VA transformer from Antek and 25,000uF on each rail. I took the amplifier parts out!

Sometimes HP 6271, 6274 rack mount supplies can be found at hamfests.
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Old 8th August 2010, 04:38 PM   #10
joaquim is offline joaquim  Sweden
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Quote:
Originally Posted by dangus View Post
The LM10CH application notes include a floating lab power supply regulator. Motorola used to make a chip that was specifically designed for lab power supplies, but it's been discontinued for some time. Still, the application note may be useful since I'm pretty sure it talks about how to choose the power transistors.

Here's a power supply that recreates the Motorola MC1466 chip using discrete devices:
Super Power Supply, Current and Voltage Regulated
LM12CLK is still available... it can handle 50V@2A... and has a nice simple LAB-psu application on the datasheet.
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