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Picture of DPS3005 Portable/Rechargeable Power Supply

When tinkering with electronics a decent power supply with adjustable voltage and a current limit is usually one of the most important tools. Most of these PSUs are rather clunky and require a connection to the grid. When working in the field this isn't always a handy option.

With this project I built a portable and (optionally) battery powered PSU which can help in a lot of the mentioned cases.It's based around a DPS3005 power supply module, however the concept can easily be adapted for similar modules with higher voltage or current.

Required parts:

  • DPS3005 Power Supply Module
  • 200W Step Up Module
  • 2 x binding posts
  • 3-position switch
  • DC power socket, 5.5/2.5mm or 5.5/2.1mm, depending on your PSU
  • External 24V/>=2.5A power supply or something with similar wattage
  • 5V Step Down Module
  • 2 x TP4056 LiPo charging module with protection
  • 2 x 0505S-1W isolated DC to DC converter (or 1x 0505S-2W)
  • 2 x SMD resistor, ~3.9kΩ
  • Matching case or access to a 3D-printer

Step 1: Step 1: DPS3005

Picture of Step 1: DPS3005
Bildschirmfoto zu 2019-05-01 13-44-19.jpg

Let's start off easy: The DPS has 4 connections - input and output. Connect the two output pins to the binding posts. Preferable these should be color coded so you don't reverse polarity when using the supply later on.

DPS modules are buck only and can only output voltages lower than the input voltage. My target was to get at least 24V output. Accorting to the datasheet the required input voltage is around 26V in this case. The maximum for the DPS3005 I used is 40V.

WannaDuino4 months ago
nice try but over complicated.
i build this 3 years ago see instructable was also my first build here and at home ever.
USING THIS PORTABLE POWERSUPPLY ALMOST DAILY.
best project and invention EVERRRRRRRRR made by me.
4.5V to 30V but low power almost 1A
and even made a low voltage adapter dor 0.1V to 4.5V for leds and 3.3V projects
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