Linear Bench Power Supply

22350Published On Dec 22,2016 15:18 PMshare0

Originally written by MATT GODFREY




DETAILED DESCRIPTION

This project is a simple linear bench power supply with adjustable voltage and current. It is meant to be a learning experience, putting ideas of circuit design, feedback, stability into practice building a complete practical power supply. I have intentionally avoided using a 3 terminal regulator or purpose built chip and instead implemented the feedback for voltage and current using a couple of opamps. The idea is for this to be a practical final product while giving pactice implementing some basic circuits.

Specs:

  • 0-30V
  • 0-2A
  • separate fixed 5V output
  • Display of setpoint and measured current and voltage

Beyond this, everything is kept as simple as possible with no additional features to compliacate the design. The display is a 20x4 character LCD controlled by an Arduino which reads the currents and voltages. The voltage and current are set by 2 pots on the front panel. There is no data logging or serial comms, although this could be added later if desired with an update to the arduino firmware.


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