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Bench power supply advice

Discussion in 'Power Electronics' started by darren adcock, May 2, 2018.

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  1. darren adcock

    darren adcock

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    Sep 26, 2016
    Hi All. Not been on here for a quite a while as lost my workshop and ongoing back issues are causing me to change the way I work.

    Anyhow, I've made a small area in my flat and am in need of getting a smaller in size bench power supply if one exists, also with ongoing back problems the lighter the better, but smaller is priority?

    At the minute I'm using a Rapid electronics DC HY3002-3 - "The Rapid HY3002-3 is a Digital Triple Output Bench Power Supply. This power supply has three independent output channels: two of them provide adjustable output of 0-30V and 0 to 2A, while the third has a fixed output of 5V DC 3A"

    Dimensions are; Width 260mm, Lenght 315mm, Height 155mm

    https://www.rapidonline.com/rapid-hy3002-3-triple-output-bench-psu-led-2x0-30v-0-2a-1x-5v-3a-85-1921

    I run it in dual rail configuration for -12v/ 0 / +12v... it would be good to have the option to run at -15v / 0 /+15v also but not essential

    Also defo need, short circuit protection/current limiter/reverse polarity protection


    I've had a look around but thought I'd ask here as figured there might be recommendations from folk who have experience of specific models... money isn't too much of a problem as it will be an investment so i can carry on building.

    I've still not had a chance to finish my PSU whch you guys were helping me with, I've decided to start again with a ready made alluminium case to make sure there are no bends/strained wires which I could forsee being a problem further down the line, I hopefully will be redoing that project around the middle of May, and will post in the thread.

    Thanks in advance

    Darren
     
    Last edited: May 2, 2018
  2. kellys_eye

    kellys_eye

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    1,146
    Jun 25, 2010
    That's pretty compact for what it is already. I doubt any space you save from getting a smaller one would make much difference to your working space.

    If I had the 'spare' cash to purchase a smaller PSU I'd use it to purchase another (vital?) piece of test equipment and/or put it towards the cost of a better 'scope for example.
     
  3. kellys_eye

    kellys_eye

    4,276
    1,146
    Jun 25, 2010
    Here's an idea..... build a small box containing a couple of LM317's - one to regulate voltage and one to limit current. Fit one of those cheap dual V/I digital displays and fit a power socket on the rear - an INPUT power socket.

    In this way you can plug in any old wall wart, laptop PSU or spare power pack you have lying around and get a simple variable DC PSU with current limiting in a VERY small box.
     
  4. darren adcock

    darren adcock

    463
    34
    Sep 26, 2016
    Cheers

    I suspected as much in terms of spec and size, thanks for replying

    I don't quite know how to achieve as you suggest with using LM317's but will do my own research as suggested

    best

    Darren
     
  5. kellys_eye

    kellys_eye

    4,276
    1,146
    Jun 25, 2010
    The LM317 data sheet shows how to configure the device as both a voltage regulator and current limiter. The very low component count makes the solution very simple (and quick) to implement - a bridge rectifier, smoothing, two extra capacitors and two resistors - ta dah..... Robert's your mother's brother.

    A variable (1.25 to 30V if you want) PSU with 0-1.5A current limiting (needs an extra LM317 and resistor).
     
  6. darren adcock

    darren adcock

    463
    34
    Sep 26, 2016
    Great, cheers

    Will begin looking into this today

    Darren
     
  7. Chemelec

    Chemelec

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    47
    Jul 12, 2016
    Or you could use an LM350 for a Higher Current rating.
     
  8. darren adcock

    darren adcock

    463
    34
    Sep 26, 2016
    Thanks Chemelec, will look at this also
     
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