Bench Power Supply 0-25v @ 0-5amp
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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.
Features
- 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
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123 Comments to “Bench Power Supply 0-25v @ 0-5amp”
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Please note
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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Thank you, Sylvain!
This is really necessary for me.
But I have a few questions for you.
First, Did you use any compiler?
Second, Y1 (in your Graphic LCD circiut) <=What's it? crystal devices?
Third, R3 (in your Graphic LCD circiut) and R11 and R12, R19 in your PowerSupply Schematic What roles?
Thx Sylvain! and Sorry, I some rude.
please forgive me.
r11 and r12 is the voltage & current ouput value
r19 set the 32v voltage regulator
I use ICCAVR
Y1 is a piezo buzzer
you can substitute the ZXCT1009 by an acs712 (5amps) and recalculate the resistors for the voltage output … in the circuit since it will need 0 to 5 volts for the current limitter circuit
Hi nice project any info about the ripple?.
Thanks, the ripple is less than 0.01volt
Hi! Very nice project !
what is model lcd you're device? WG12864K-YYH-VN will be work?
I don’t know, you need a lcd with a sed1330 controler or compatible one
Hi, could you tell me the reference or part number for the LCD screen you are using? Is there a datacheet availaible for it? I would like to build somethng similar, thank you.
It’s no longer exist, I had try to buy other one last year and nothing is available
I think analog SED1330 this KS0107/KS0108. I'm buy WG12864K-YYH-VN and check. Thank you!!
has somebody found a working display for this project?
What would it cost to make this? What modification would be needed if used with european 230V?
Lost of $$$, change the transfo
hi thanks for project
i want make this project but i cant open source cod with code vision !!!
and i dont see this header files #include <iom32v.h> and #include <eeprom.h>
All my projects are written with ICCAVR and the code can’t not be compile directrly and I can’t help you with that,
Sylvain
hi
i cant found this lcd !! i have graphic lcd model : ts12864a-2/b the pins not match please help me
I can't help you I don't know this LCD with is controller
Hi,
Nice power supply you have built there. Thanks for sharing it.
I happen to have some tip33c transitiors lying there, may I switch the D44VH10 with these?
Also, I have a 230V to 2×40V transformer (5A). Can I use it instead of a 30V and a 40V transformer? Or will 40V be too much for the high current side?
Last question, what is the power rating for R20, R21 and R22?
Nicolas
Hi,
Yes it should work with oter transistor, but you must change the value of R23, Yes you can change the XFO but P=IE… if you need
to output 1V at 5A you will loste 39V at 5A lots of power very huge heatsink
Good project!
I just wanna know if is possible not use the devide "header 5X2'.
Is it really necessary? What does it do?
By the way is an RS-232 output connection?
Thanks a lot.
Carlos
if the header is connected to the mcu that’s the programation port
no rs232
Might increase the out voltage 30V?
Thanks Tom
not with this design, then max could not be over 26v