Designing and building a bench supply
Another article that might help with bench power supply designs:
A good, reliable and easy to use bench power supply unit is probably the most important and most used device in every electronic lab. A proper electronically stabilized bench power supply unit can easily cost over 200 Euro. Using a clever microcontroller based design we can build a power supply which has more features, is easy to build and and even cheaper.
Via Hack a Day.
This entry was posted in power supply and tagged bench power supply.
Comments
The link provided ultimately links to the tuxgraphics website tuxgraphics.org.
The power supply is controlled with an AVR micro, the software is open source. You drive it with whatever unregulated power source you have. I use an old laptop power supply.
I’ve got one and it works very well. I’ve changed the software a bit to fit my needs better, this too was easy.
I can recommends it very much. I was lazy and ordered the complete kit, assembly was easy.
Makes my hacked up old ATX PSU look a bit caveman :)
A question on the Tuxgraphics design version 2… The voltage is sensed with 2 resistors BEFORE the 0.5 ohm current sensing resistor. The voltage is correct at that point, but the actual output voltage after the 0.5 ohm resistor is lower, by several tenths of a volt, and the error increases as the current load goes up. In other words, the voltage is sensed from + out and ground, which is different from + out and – out. Should R8 go to – out , not ground? Does he compensate for that in software?
Thanks!
Rob