(Topic ID: 258931)

Power Supply voltage help

By oldschoolbob

4 months ago

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  • 5 posts
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  • Latest reply 3 months ago by oldschoolbob
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    #1 4 months ago

    I’m working on another power supply and have run into a small problem. This is what I’m using for the power supply. 115 AC volts in and 60 Volts DC out (the output is adjustable and it’s set on 60 VDC now.)


    HTB1i1oFXLLsK1Rjy0Fbq6xSEXXac (resized).jpg

    The one I’m using is the ”S-400-60”

    I need to run a fan and a pilot light but they run at 12 volts DC. I have this:


    H3d886f0b8abd4c02870bf3043245f6e4l (resized).jpg

    The specks say 6.5 to 60 volts input – 1.25 to 30 volt output (adjustable).I want 12 Volt output for the fan and light.

    I’d like to keep the power supply at it’s 60 volts for this Voltage Regulator Buck Voltage Converter:


    H79aedbf7b00843a091982db4b76679e4s (resized).jpg

    The voltage supply has three output taps but they are all the same. The small step down converter says it will that take 60 volts in but I don’t want to damage it with overvoltage. I would prefer to run it at a lower voltage (say 50 or 55 volts) to be safe. But that means the Buck Converter will only get 50 or 55 volts and I want it to have the full 60 volts.
    Is there anything I can add to this to be sure I don’t overload the converter?

    Thanks Guys.


    #2 4 months ago

    Anyone? Anyone?

    3 weeks later
    #4 4 months ago

    Sorry Quench, I didn't see your response until today. You must have posted on the weekend my LAN router crashed and I didn't have internet.

    Quoted from Quench:

    Bob, you've gone to the dark side and bought direct out of China!

    Yes, big mistake again - when will I learn. About a year ago I bought some Arduino stuff from Aliexpress. Then next day someone used my credit card to buy $1700.00 at Neiman Marcus in China. This time I bought a gift card to make my purchases. This worked fine except after the sale went through the seller of the RD6006 step down power module told me I need to pay $11.00 more to cover increased shipping cost. I refused to pay the additional and told them to cancel the order. A few days later they said it shipped and gave me a tracking number. I tracked it for several weeks and it was delivered to Connecticut - I'm in Illinois. After another week I finally got a refund. They had my money for 5 weeks. Next I bought another module from China except I went through E-bay. It's been over 7 weeks since I started this project and I still don't have the main part.

    Your links to the items are all correct.

    I'm trying to build a big power supply around that RD6006. 60 volts DC - 6 amps - 360 Watts.


    I could have used the metal case but it had too many things I didn't like - It's 12 inches deep (my shelf in only 10 inches) - The power switch for the power supply is located on the back (it should be on the front) - There is no indication that the supply is on. To remedy all this I built my own case.

    The switching power supply has an adjustable output of over 60 volts DC. The small buck converter has an input range of 6 to 60 volts. (I'm using this to drive the fan and the pilot light). At present I have the switching supply at 57.5 volts and the buck converter output at 11.9 volts. Everything seems to work fine.
    I'd like to operate the switching supply to it's full 60+ volts but I'm concerned I'll blow up the buck converter. The converter was cheap but the ship time was 4 weeks (I should have bought two).

    Here's some photos of where I am so far:

    Building the case from 1/8 inch plexiglas:

    IMG_4020 (resized).JPG

    Bottom and back of case:

    IMG_4024 (resized).JPG

    Front of case:

    IMG_4026 (resized).JPG


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    12 volt buck converter and standoffs:

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    Converter, fan, and pilot light:

    IMG_4044 (resized).JPG

    Switching power supply installed and tested:

    IMG_4049 (resized).JPG

    Front of case with air slots cut:

    IMG_4086 (resized).JPG

    Parts installed:

    IMG_4096 (resized).JPG

    Just need the main part:

    IMG_4108 (resized).JPG

    #5 3 months ago

    After almost two months and three Chinese sellers I finally got the main part – the RD6006. It’s really neat. 60 volts – 6 amps – 360 watts. I connected everything and took it for a test ride. It all works fine. I then completed the case and installed everything. I connected it to my scope and checked it for spikes. I didn’t see any and the DC fluctuation is minimal – 400 to 800 mV at 50 volts.

    I then connected one of my 12 volt halogen bulbs. I was concerned when the voltage dropped way down and the light didn’t light. Then I noticed I had the amperage set to one amp. I increased the amperage to 5 amps and the light came on and the voltage was steady. The light was pulling 3.1 amps.

    The only down side is it will go to over 60 volts but I have it set to 57.5 volts. I’m worried that if I go beyond that I may blow the little buck converter. It’s only rated to 60 volts input. It’s like having a Porsche with a throttle restrictor. I doubt that I’ll ever need more.

    It was still a fun project.

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