XL4016 CC CV Power supply Modifications & Repair Part 2
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- Опубликовано: 11 окт 2024
- In this second part, I modify and repair the XL4016 power supply. I swap out the op-amp for a better one, add a feedback resistor to the current regulation circuit, add a capacitor to the main switcher chip Vc pin and swap the input and output capacitors.
At the end of the video, I test the circuit and show that it is now working properly as a constant current power supply. I don't talk to camera in the last section as I am filming at my desk at work, and there are people around me.
I did get permission to record this at work, and I also got permission to use the components from work stores that I used.
![[Natalex] Мощный понижающий DC-DC преобразователь XL4016 "DC-DC CC CV Buck Converter"...](http://i.ytimg.com/vi/XVd_tkK5BJE/mqdefault.jpg)
Impressive review and overhauling.
I just wonder why it would be necessary to replace the LM358 by a LT2178. It is true this later one has lower noise and input offset figures, but these better features are not needed for this circuit. Also, its slew-rate is just 0.04V/us, slowing the current feedback to much (my guess) while the jellybean LM358 is about 10x faster.
Thank you saved me a look around. The isolation from this is annoying any time spent near it and I keep hearing it... Even when it's off...
Hopefully we'll see. the end of that.
I noticed the input and output caps, I will replace them, but not swap. The larger the output capacitance the slower the buck response. 470 should be fine.
Thank you also for part 1.
Is the current gain from that 5v regulator?
Hence the cap as it can't produce much power..
Nice video I learnt alot from it.
I mistakenly swap the polarity of my power adaptor and connected it to buck converter and it stop working, please how can I get it fixed, what should I do?
Amazing work. Thanks for sharing. Is it possible to bypass short curciut protection in this module for voltage injection.
Hi,
The module doesn't have short circuit protection as such. It has a limited current output, and if you reach that limit it will automatically reduce the voltage until the current is at the output limit. There are two current limiting mechanisms. One is done using the constant current potentiometer and the op-amp circuit I describe in the videos (see part 1 as well), the other is built into the XL4016 chip. You would be able to disable the external current limit by removing the diode on the output of the op-amp. The current limit in the XL4016 (set at about 14A) is fixed and you can't disable it.
@@alexwood020589 Thanks a lot.
Hey. I think the chineses did their homework on this one because mine came with all the changes you did. I even asked if you wanted the value of the capacitor near the opamp! But I realize this is an old video now. I am late on buying myself one of these toys. Lol
Hello. I want to ask about amp of this buck not increased and decreased. What is the problem with this?
That was an amazing video. I am curious how one would modify the circuit to prevent the input voltage from dropping when current draw is increased on the output.
I saw that works as a great cheap mppt in solar applications.
The idea is to decrease current on the output automatically to prevent input voltage from dropping
Hi
Mppt is slightly more complex than that. As you slowly increase the load on a solar panel, the voltage does drop, but the power your extracting increases up to a maximum. Then as you increase the load more, the power starts to drop again.
Say the OCV of a 100W panel was 20V. You put 100mA of load on and it drops to 19.8V, you're pulling 1.98W out of that panel. Now apply 1A of load and it drops to 19.5V, now your pulling 19.5W. Apply 5A of load and its 18V and you've got 90W. Apply 6A of load and it drops to 14.5V and now you only have 87W, so the max power point is somewhere between 5A and 6A.
I made those numbers up to illustrate the point. You have to vary the load to keep the output power at a maximum.
If you use a stock one of these.
What happens is the current (adj) will pwm based on the voltage to your power in.
So as the sun power goes up you can maintain amps, to a point when it crashes from the max mppt.
The lower voltage the lower the current. (Lower the power)
I was not able to get it to high current and voltage (within reason) as I was Charing a battery, but it just wouldn't give me the voltage I wanted.
As for mttp you would have to adj and reset the current to maintain the peak, as it will drop the current.
(Though Mr woods video may resolve an issue)..
My buck converter does not change led colour, always in red even without load. What can be the problem, please share.
You have god level supplies 😱😱😱
the input voltas give about 40 volts. The output voltage goes up to 10 volts and falls again.
beautiful video and extreme precision, your laboratory and your availability of components is enviable .............. I have this fantastic module but the output voltage is always 2.9v / 3.2v , in your opinion what could be the problem, Thanks for sharing this video, pure entertainment
Up
replace XL4016
@@erandaudayakumara9790 you talk about the controller or about the entire module?
@@PupettaZoccola XL4016 controller.
Can we use this module as a sort circuit remover???
I tried this, mine is now not doing CC. Only CV works. Red light stays on all the time.
what is the problem brother.volts in potansiomet is getting down again
Hi. Excellent video. I have this module too. What is its real efficiency? Thanks. (sorry for my english)
Suso Sanchez
The circuit is a classic buck converter, so the efficiency will depend on a few factors like the input voltage, the output voltage and the current draw. There are three main areas of power loss in the circuit: the forward voltage of the diode, the switching losses in the MOSFET and the resistance of the inductor. The losses are all proportional to output current only. So at a low output voltage and high current, you will see the worst efficiency (lots of losses and not much output power).
At the end of the video, I'm running the power supply at 1.6A output, at 12.6V. That's 20.16 watts. It's drawing 0.8A at 26V input, which is 20.8 watts. So the efficiency is 96.9%. It's hard to calculate exactly what it would be for different load currents and output voltages. Best way is just to test it and see.
Thanks for your comment.
Thanks Alex. In this moment, I'm testing the module with a Vin 22V (trafo 80W) and Vout 12.3V. The load is a dummy load DIY, with a IGBT.
When I finish, share the results.
Thanks again.
Hi again. These are the results:
Vin 22V - Vout 12.3V
0.5A - 85%
0.8A - 89%
1A - 87%
1.5A - 83%
2A - 79%
2.5A - 77%
3 A - 71%
However, the module is quite efficient. Regards.
@@jesussanchez1971 hi
Thanks for the data, that is really interesting.
I would have expected the efficiency to increase as the load increases, up to about 80% of the rated output of the power supply, and then start to taper off again.
Surprising that it just drops with increasing load. I'll have to do some tests on mine and see if I can work out where the losses are.
I tried to replicate the module with the same components, but it don't work (on protoboard). Maybe the inductor is the cause. With a load, the voltage drops.
This is a good video series. I especially liked the reverse engineering part. The final test this video could just have been better with some commentary though, since I didn't know which potentiometer you were adjusting. (Though I assume it was for current)
I'm glad you enjoyed the videos.
You're right about the last bit, I would have liked to narrate what I was doing. I was filming at my desk at work, and there were people around me, so I couldn't really talk.
I was adjusting the current setting into a fixed resistance load, showing that the power supply was stable.
What happened with Part 1?
volts in potansiomet is getting down again
modul xl4016
hello
Nice video I learnt alot from it.
I mistakenly swap the polarity of my power adaptor and connected it to buck converter and it stop working, please how can I get it fixed, what should I do?