This project is like the one that all of you must have done in electronics. I took the idea from Circuit Cellar. The original power supply provides an output of 2.5-15V at 500mA. This circuit will provide 0-25V at 0 to 5A. You will see there is a lot of modification to achieve this.
This is my second version of this power supply, the first one was made with mosfet who need a higher voltage on the gate I had to use a higher input voltage and because of this there was a lot of heat generated for nothing. This version work with transistor and it's much more better.
I will explain you some part of this power supply. First you must find a transformer which can handle 24VAC at 5A and one with 6.3VAC at 100ma. I use 2 transformator to have 2 DC level 30V and 40V. The 30V Power the high current for the output and the 40V power all the rest of the circuit. The LT7013 opamp is split in 2 function, the part A is the voltage control and the part B is the current control both opamp output is connected together via diode so the one who output a lower voltage win on the second, so if you set your voltage to 10V and your current to 1A and you short your ouput the current part will pull down his output and the voltage will drop. The current part use a very nice component the ZXCT1009 that work like a current mirror. it will generate a current proportionally the the one who pass in the sense resistor, this current is pass in the pot R8 who convert it in voltage. The output have many transistor because the opamp can't give a lot of current, and note that the resistor R23 is very important, this one will protect your output transistor from a output short circuit "transistor explosion is faster than the current sense". If you build this supply you will be impress how fine it's work.
I also connect to this power supply a LCD to inform you of the set point for voltage and current, plus the current voltage and current. It's done with a small ATMega32 with 4 A/D input to received the value from the power supply and with some simple calculation it display those value.
- Output Voltage adjustable from 0 to 25v
- Output Current adjustable from 0 to 5amp
- Digital reading of set points for current & voltage and output current & voltage.
- No need of multi tap transformer or center tap transformer
- Short circuit protected
- Very low cost
117 Comments to “Bench Power Supply 0-25v @ 0-5amp”
All my source codes were taken from my personal projects.
Everything is for your information only. The C/C++ codes have been written
with ICCAVR. You can find the header and source CRT files by downloading their compiler.
All is for your information and everything is AS IS without any warranty of any kind. No other files are available and I don't make any modification for any body.
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