Power Management Unit Build Part 1

This is the part 1 of my Power Management Unit Build.  The purpose of this project is to create a power center for my homebrew Amateur Radio station so that I can control and monitor it directly from the unit or over an IP based network remotely.

I will accomplish this by employing an Arduino micro controller board that we sell at flatwatertradingpost.com.  The components in the PMU are as follows:

A 40 amp switching power supply purchased off the internet.  It features adjustable voltage from 10 – 13.8V, line and load regulation and Hiccup mode (recovers automatically after fault conditions).

I looked at building the power supply myself as I wanted a switching power supply due to is size and weight.  I found some plans on the internet.  The closest was a design by Manfred Mornhinweg XQ2FOD published in QST in the December 1998 issue.  It looked like what I wanted, but you had to wind the transformer yourself, and I didn’t feel that I wanted to tackle that at this time.  This project is modular in it’s design, so if I decide I want to build the power supply myself at a later date, I can then just drop it in place of the current supply.

The next major part of the unit is the Arduino Mega 2560 board.  I will be using it to control the other components in the PMU.  I have written most of the code and will post it as soon as I have finished it.  There is also a Ethernet shield.

Then we will have a 5v power supply to drive the Arduino, 5v relay board and the back light of the LCD.  There will also be a voltage divider to measure the output of the main power supply.

The front panel will consist of an on/off switch, LCD display, 4 momentary switches to turn the ports on and off and 4 leds to indicate the status of the ports.

The back panel will consist of a power cord receptacle, a fuse block and a set of power pole connectors for each port.

In the video I will show the panel parts and the bread board setup that has been completed so far.

In the next edition of this series I will actually cut out the front and back panels to start construction.

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