Very nice Well done!
Is it open source? Details? Schematics? Source code?
I'm debating building something like this or buying one.
Very useful build. Something I think a lot of people here (including me) could use, but do not prioritize to buy.
Please explain how to set the different modes and a little bit about the program loop, PWM control and measurements/calculations to the display.
Very nicely done and great pictures. :-+
I would be interested in your code if you have any plans to share it. I have a bipolar power supply (https://www.eevblog.com/forum/reviews/review-lambdaemi-boss-bipolar-operational-ps-or-'40-pound-op-amp'/msg166740/#msg166740)and I want to make a module to control it as an Eload in CC, CV, CR, and CW modes. looks like your code would save me a lot of work and learning curve.
Those are some very cool power supplies :-+ what kind of voltages does it take to control the sinking current?
Very nice project.
I am interested to know the ripple current in constant current mode, how does your device perform?
Thanks for sharing.
Default is 1V per amp and 0.5V per V but both are adjustable with an external resistor.
Mine do not have that option. I have the schematics for the control boards but would still require re-creating their code and that would be way more work than just building your control/display system and driving them with a control voltage and . I think just using your control loops and interface to drive the BOSS would be easier.
Thats a fine piece of work! :-+ :clap:
+1 :-+
Hi i would like to know how did you match the output current to the setting point
am too building a dummy load using an arduino had it working but i have some oscillation on the mosfet i think
thanks \
shailesh
targetPwm += ((targetCurrent - lastCurrent) * 0.005);Nice, happy to see you putting all that equipment to good use.
Minor suggestion: you could print (regular 2D) the front panel text and graphic labels on a transparent foil (mirrored on the back of it). Transparent paper is available in inkjet or laser variety. You then mask the LCD position with a temporary rectangular sticker and spray it all with white paint (also on the back side). Remove the sticker and you have a white background with text on top and a window for the LCD. Just glue it in place or cut it to go under the edges of the enclosure.
Also, FWIW you can mount LCDs and other stuff directly on the enclosure's metalic/plastic front panel with sunken screws that get covered by the previously mentioned transparent panel.
Thanks jaxbird for the explanation,
i will try to make a video and post it in a new post , else its a very nice one u made ,
mine am using INA 219 to read the current and voltage out of the shunt, and am Using dac 4725 to set the voltage on op amps followed by the mosfet,
i have posted the link for the dummy load i built, https://www.eevblog.com/forum/projects/dummy-load-digitally-controlled-by-arduino-328/ (https://www.eevblog.com/forum/projects/dummy-load-digitally-controlled-by-arduino-328/)Thanks jaxbird for the explanation,
i will try to make a video and post it in a new post , else its a very nice one u made ,
mine am using INA 219 to read the current and voltage out of the shunt, and am Using dac 4725 to set the voltage on op amps followed by the mosfet,
You can do the same kind of continuous feedback adjustment with a DAC. Anyway, looking forward to see your build. :)
If I build another one I would probably make a few changes like using a small transformer for power supply, use some better opamps and be a bit more careful with my ground. Probably I would also use 2 MOSFETS instead of just one. And of course I should really isolate the USB from the device. But overall I'm pretty happy with the performance and features, it is a very useful little device.
Jaxbird , would be Nice to have a video of your Dummy load in action , was trying to have some pictures of mine my camera battery went down, have been able to take some pictures will try to upload it
regards
shailesh
i have posted the link for the dummy load i built, https://www.eevblog.com/forum/projects/dummy-load-digitally-controlled-by-arduino-328/ (https://www.eevblog.com/forum/projects/dummy-load-digitally-controlled-by-arduino-328/)
$1;1;0;1133;318;0;0;0;0;0;20;21;0;16<cr><lf>Its very Nice the Graph, you have a smooth value read out,
hmm which mosfet are you using in your design?
regards
shailesh
Jaxbird, will try the dummy load cct u have done and see how it works
n will revert back
Else today is my last day of holiday as will soon join another work so wont have time with projects now, and got a small baby to look after just turned 11 months.
else i have tried it with the cct you have made and its better now in most range of the current , i added one component at a time to see its effect and the 1 k was the one who reduced most of the noise, could you tell me what did the 1 k resistor do ?
thx
Shailesh
Hello Jaxbird,
have joined th work and it seems to be going fine now, else will try with other values and see the results n THX
n regards
shailesh