Rechargeable Portable Lab Power Supply (MEHS) Episode 42 - vTomb

Rechargeable Portable Lab Power Supply (MEHS) Episode 42

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I've taken a Power Supply module and lithium ion battery charger module I found on Ebay and made a rechargeable portable lithium powered Lab Power Supply with Multimeter and lighting.

The parts used are:
Digital Programme Control Step-down Regulated Power Supply Module DC 6-55V H4EC.
Pololu U3V50F24 Step up voltage regulator.
1, 2 or 3 cells 1-2A Lithium ion Battery Charger Module PCB 18650.
2 switches.
2 power terminals - banana type.
1 power jack 2.5mm.
3 18650 lithium ion batteries.
3 18650 battery holders.
1 Toolpro storage box.
1 12v led strip (6 leds).
1 Multimeter


Show dialogue:
In this episode I will be taking a look at a constant current constant voltage programmable power supply that I picked up of Ebay and I've turned it into a rechargeable lithium ion powered, portable Lab power supply.
So in this project I've used a few familiar parts, I've used the pololu power regulator. In this case I've used the 12 to 24 volt version so it takes the 12 volt input and gives you a 24 volt output.
I've used a no name brand 3 cell lithium ion power / charging module. So this particular one will charge a single cell, two cell or three cell lithium ion powered battery bank and I'm using 3 18650 batteries in order to be able to give me the 12 volts out for the project that I need. But his particular module can charge all 3 so it can charge a 12 volt or equivalent battery.
I'm also using a couple of switches, a couple of banana plug terminals and the programmable power supply module I spoke about.
I'm also using a ToolPro ruggedised storage box, the ones that come with the foam padding etc, and I've just made my project inside of that, giving me plenty of space to be able to store a multi-meter and all of the attachments, put a little bit of lighting in there and realistically there is even enough room for some small tools or even a Raspberry Pi 3 and an LCD if you wanted to put that in there as well.
So this programmable power supply module that I picked up off Ebay is a rather nice little unit. It has a backlit LCD display. It does have an input voltage range of 6 to 55 volts, obviously I'm not putting that into it, I'm putting about 24 volt in. Zero to 50 volts out, obviously it is a step down system so you can only ever get out less than what you're putting in. So in my case I'm putting in 24 volts. I can have from zero to about 23 volts as a range but that is perfectly fine for a portable lab power supply. And although there are a few different models available, my particular model has a 2 amp output range and that works out reasonably well as well I'm using 18650 batteries as my power supply. Each one of those is rated at 4 amps but realistically its going to be about 2, so I'm getting 3 18650 batteries, wired in series, puts out around about 12 volts and I'll be getting 2 amps, pretty much continuous, a tiny little bit of drop going through the pololu power regulator but as far as everything is concerned I'll realistically be able to get very close to 2 amps output from my power supply module and upwards of 22 volts.
The module itself is controlled by this knob at the front which is also a push knob in order to be able to cycle through the individual settings, so you don't just dial from zero right through to the maximum voltage, you can in the right setting, but you can actually pick each individual column, so the tens of volts, the individual volts, in order to be able to select the exact voltage that you want before you actually turn the device on.
Having turned the device on you can also head straight back into the settings and use that knob and adjust the voltage accordingly. The back of the device does have a fan, so if it does get too hot and you're pushing out close to its 2 amp limit, the fan will kick in and keep the unit nice and cool.
This particular module also has a memory function so you can preset some of the more desirable or most used voltage ranges and recall those from memory.
So as you can see there is a very slight variance coming out of the module as read by this multimeter. The multimeter is not one of the high end multimeters but its reasonably accurate so that very very small percentage difference that you're seeing on the LCD of the power module and the display of the multimeter is well within tolerance for what my needs will actually be.
I would be interested to test it with a few more multimeters, an I've only got 2 here in the lab at the moment so, I might do that a little bit later on and just see how accurate the display of this power supply actually is.

Episode 42

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