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Bench Power Supply?

Discussion in 'Power Electronics' started by KiwiSteve, Dec 22, 2016.

  1. KiwiSteve

    KiwiSteve

    28
    0
    Apr 11, 2014
    Hello,

    I'm looking for recommendations for a programmable bench power supply with the following requirements:
    * 0-40V
    * 0-15A
    * 600W
    * Single output

    Any suggestions?

    Thanks,
    Steve
     
  2. Rayregula

    Rayregula

    84
    18
    Dec 20, 2016
    Programmable how?
     
  3. KiwiSteve

    KiwiSteve

    28
    0
    Apr 11, 2014
    Should have said "variable" ;)
     
  4. Chemelec

    Chemelec

    291
    47
    Jul 12, 2016
    Variable, Do you want a Switch Mode Supply or Analogue Supply?
     
  5. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,214
    2,695
    Jan 21, 2010
    Do you have a specific need for this range of voltages and currents?

    If you can get away with (say) 0 to 30V at up to 3A for most of your work then the are many power supplies that may meet your needs. There are also some fairly reasonably priced 15A power supplies which may not have the same voltage range (and which may be effectively noisier). If you need 12V and/or 5V at high currents, the is also the option of PC power supplies.

    It really depends on your needs. If space is an absolute premium then you might be able to find a single per adult which sure this.

    I will admit that my reply was initially predicated on your requirement for a programmable power supply. Now that you say "variable" the are way more options.

    You could look on eBay for a second hand lab power supply from (say) HP. I purchased a couple that were rated for 0 to 40V 30A (from memory) for almost nothing. The issue is that they weigh about 70 pounds each...

    I could look up the part number for you... HP 6268B.
     
  6. Chemelec

    Chemelec

    291
    47
    Jul 12, 2016
    An MC1466L can create a Lab Grade, Linear Power Supply of almost any voltage or Current rating.
    With Separate Current and Voltage Controls and it is Adjustable down to Zero Volts and/or Current.

    The MC1466L is Discontinued but available on Ebay from China.
    I Also have a Discrete Version of this Integrated Circuit that I Designed, Using transistors.
    http://chemelec.com/Projects/MC1466/MC1466.htm

    But you will need a Pretty Hefty Transformer and Large Filter Caps for 40 Volts and 30 Amps.
     
  7. ∞Farad

    ∞Farad

    1
    0
    Dec 29, 2016
    So, if you run this power suppy at output = 0.1V @ 15A, it would have to dissipate 600W of power, which means it would be like a portable heater at low setting, unless it is a switching power supply.
     
  8. Chemelec

    Chemelec

    291
    47
    Jul 12, 2016
    I have Never had a Situation to supply just that ".1 Volts at the 8 amps" that I have.
    But I Can Short the Outputs Continuously.

    Yes it can require a considerable number of Paralleled power Transistors.

    I Built Two of these supplies in a Single Enclosure. (14 inches wide, 11 Inches High and 10 Inches Deep)
    Each one has its own Separate Power Transformer and supplies an output from 0 - 35 Volts with 0 - 8 Amps.
    So I can Series them or Parallel them.
    I can also create Both Positive and Negative 35 Volt Supply with a ground connection in the center.

    I have Temperature Controlled Fan Cooling on each of the Output Heat Sinks.
    And I can Short the Outputs Continuous with no Damage at any settings.

    Built Correctly and the Amp Meter Produces No Voltage Drop to the output.

    I Built this about 30 Years ago and it never gets turned off.
    No it is NOT SMALL, But it Works for me.
     
    chopnhack likes this.
  9. Colin Mitchell

    Colin Mitchell

    1,418
    314
    Aug 31, 2014
    I want a car that does 190km/h, uses 2 litres of fuel per 100kms and costs $2,000.

    I have no use for it but it one of my demands. Just like a 15 amp 40v power supply.
    I have never needed it in 50 years, but it is one of my IMMEDIATE DEMANDS.

    Just use a 12v $6.00 4.5AHr battery.
     
  10. KiwiSteve

    KiwiSteve

    28
    0
    Apr 11, 2014
    I guess we're not working on the same type of projects ;)
     
  11. Colin Mitchell

    Colin Mitchell

    1,418
    314
    Aug 31, 2014
    "I guess we're not working on the same type of projects"

    OH???

    Please tell me what project needs 40v @ 15 amp.
     
  12. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,214
    2,695
    Jan 21, 2010
    Listen to Colin. He knows everything.

    For example, he knows that Hewlett-Packard never produced the HP6268B power supply. (Or if they did, nobody had a use for them).

    Hey, I think you probably need to consider whether these specs represent a need or a desire, but I'm not so arrogant as to suggest that **nobody** has a need for one.
     
  13. Colin Mitchell

    Colin Mitchell

    1,418
    314
    Aug 31, 2014
    "Listen to Colin. He knows everything."

    I am glad I can add you to my other 22,000,000 visitors to my website who take heed of what I have to say.
     
  14. ag273n

    ag273n

    74
    4
    Nov 24, 2016
    I'm guessing KiwiSteve needs it for RC hobby stuff.. such things needed so much amps...

    If my guess is correct, ATX power supplies from old pc's have so much amps on given voltages: 12v, 5v, and 3v.
    One of those voltages (depending on the model you might get) will have about 20 amps. -thats a lot of amps!
    You'll find soooo many youtube tutorials on how to make one. Its sooo cheap, you can make more than 3 of these for a price of one variable powersupplies in the market.
     
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