Small Bench DC Power Supplies - Review and How To (Constant Current vs. Constant Voltage)
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- Опубликовано: 6 окт 2024
- Here I am reviewing and showing basic usage of the Longwei and Kungber bench variable power supplies. Especially the difference between constant current and voltage and how to adjust them.
SAFETY POINT: I forgot to mention - always disconnect the power supply from any load when turning it on and off, and when adjusting voltage and current!
Affiliate links:
Kungber - amzn.to/3sHcoax
Longwei - amzn.to/3lYQdd1
Please post if you have any questions or comments!
At last someone who gives clear detailed instructions on how to use a PSU. Ive watched loads of videos but your is by far the best for a total female beginner. THANKYOU
and a male apparently. Thank you!!
Thank you for not having a 12 minute intro.
For the last few hours, I've been trying to bring myself up to speed on using my entry level benchtop power supply. Your video is the clearest and straight forward so far. Thank you very much.
Glad this helped. I went through the same experience.
Agree.😎
Definitely the best one I've seen so far
Mine has been sitting in the box until finding this video... It's like getting a birthday present all over again!
@@TheWilltoBuild if I set mine on 14V and connect it to a battery it automatically jumps into CC 🤦🏻♂️ HOW does it stay in CV?
Finally ! A clear explanation on how to use these things properly and safely .... thanks brother ! 😊
Thank you so much for this video!! I just bought a cheap power supply and i was just getting ready to send it back because i didn't think it was working. You explained everything so well!! I have been watching videos for the past hour and they all had me confused. Your video got me back on track. Thx again!! Take care!!
Aaron
The Kungber on the right is the exact model I just bought! The instruction manual looks like Google translate was drunk, so I appreciate the info.
Finally! An explanation on CC/CV power supplies that I can understand. Thanks
Glad it was helpful.
I saw videos regarding this power supply. I must say that this is one the BEST video and awesome explanation. Thanks a lot. 💐
Excellent, I never knew that I could set my power supply like this until I watched your video - thank you!
I knew I could set them but I never really knew how they worked in concert with eachother, also that’s crazy bro you just found that out with all that you do @sreetips lol :)
I have a unit similar to the one on the right. "Nice" is the brand on it. One of the many sellers warns you to ONLY adjust the current limit (by shorting the leads) when the voltage is set to 5 volts or less! That isn't mentioned anywhere in the manual that came with the unit.
likely to reduce arcing at higher voltages. 60V may produce a pop?
Very helpful video! This is really what people will need if it's the first time they bought themselves a bench power supply
Great video man, it took me 5 or 6 trys with other clips but as soon as u spoke I knew exactly how smart u are and how articulate.😊
Thanks man! I got myself a power supply about a year ago similiar to the one on the right except mine's Evetek and it doesn't show wattage, but to this day I had been rocking my brain in figuring out how to display the change in current output on the machine, so I gave up on it supplying current and just focused on voltage. Appreciate the help!
i bought a power supply because i plan on doing some electroplating, and this is the best ive seen so far
I know this video is 2 years old and you've probably since moved on or perhaps have already done so but a best practices and safety video would be nice for those of us who are a bit gunshy
Thanks for this. I just bought the Kungber 30V 10A unit which I like. This said the instructions that come with the unit are okay, but only okay. I really needed to see someone step through the basic possible configurations of the device, with constant current and constant voltage, and the automatic cross over between the two, in order to understand how the controls work and what the displays mean. The Kungber seems like a well made, basic tool. The wattage display is a nice bonus.
Well explain to me how to use it. I recently bought the same exact model, and I really only need it to test headlight assemblies. I'm confused on to set the voltage, and amperage. Most of the assemblies I'll be testing only need 12v, about 4 amps, 55w at the highest for bulbs. So do I set it at like 13 volts, 4-5 amps, and then it's plug and play to the assembly?
The current control is just a current limiter, that is all it does. You can leave it on maximum for most things. Its useful if you are testing something that is delicate, ie a new circuit you are testing and you want to limit the power for the trial run to make sure nothing overheats gets damaged.
Thank you for a great explanation on setting the power supply up to read voltage and current.
Super helpful. I recently acquired a real "Shenzhen Special" with terrible operating instructions. This was so much clearer!
Glad it was helpful!
You definitely explained how to set up the Kunberg better than the instructions did. Wish I had watched your video first.
Nice video. A couple of features to look for that don't necessarily add a lot to the price are a lock button that locks your adjustments so you can't accidentally change your settings and a separate power switch to allow you power on/off to the leads after you've adjusted your settings without turning off the main power.
Very good tutorial! I cracked up when you perfectly placed the ad segue when the camera mount moved. I like your videos!
Super helpful video for me to learn how to use a bench power Supply that is new to me.
loved this video, perfect explanation. not too much fluff and an easy way to understand. Thanks man!
I like the ad break right when you drop your camera. Very suspenseful.
I had challenge setting the current, thanks for the current adjusting explaination
Thank you so much; I have a power supply and this was no where in the whole instructions and it is made by a diff manufacturer… and this works thanks thank u
Very nice tutorial. I have been using the Longwei identical to the one you were demonstrating for some time, but this video actually taught me some things I did not know about the unit. Thank you.
Thank you. I learned something today. Now I can use my power supply correctly.
Thanks for sharing your experience and thoughts. I am currently researching bench top power supplies. Appreciate you explaining these details and differences. Helpful video
Update: Just ordered a Longwei 3010D with course & fine adjustments from Amazon 2 day delivery 😎😄
It has been quite a few decades since I diddled with electronics, at least in "bench mode." I've just gotten this new Kungber and am still trying to muster the courage to actually connect it to my breadboard circuit. It is just ~so~ counter-intuitive to me to see my selected voltage in the display and SHORT THE OUTPUT! But I'm doing it...ever so gingerly. I think I am going to pretend for a while that the current controls just do not exist (like in my old-timer experience). I really do not like to work with power without feeling absolutely in control, without everything being completely intuitive. OK, I'll set the current, but only change it with great deliberation. I guess I feel like I have to, because I don't see the easily accessible fuse on the front panel, which used to put the brakes on my current. And, of course, I can see that this is really so much better, because a one-amp fuse my have limited the fire hazard in the past but didn't do much for protecting the low-power ICs and other components that we mostly work with now. (If I had been on the design team for this product, I would have insisted on a button that said "Adjust Current" and shorted the output internally without me doing such a wretched thing myself. IMO, kinda bad to initiate total newbies into any kind of electrical work without supporting their wise instinct not to connect + straight to -.)
Just bought one to charge my headway lithium bank for my car audio system and this is a great explanation! 👏👏👏
This was probably the best explanation I’ve seen so far on bench power supplies. I’m about to start top balancing my new 280ah cells. Still a little confused on whether these units eventually shut off when they reach the max cell voltage. 3.65. Or if you need to monitor it.
of course not dude they're bench supplies how are you going to use it to test stuff if you want it to run all night you want it you run all night. you're going to want to get some bms chips, they're available for single cells, or packs in different configurations of S and P. the bms will shut off the current after the battery is charged. they're also cheap, like i got a whole board of single cell ones like 10 chips for 5$, they just have tabs to solder on input and output wires.
@@simonlinser8286 they do actually shut off when they reach the max voltage.
Amazing, thank you. As someone that knows nothing about this, this made it very easy to understand.
Thanks, you have a easy way of explaining things and this helped me understand how to set the CC mode.
Great explanation! I just bought a similar unit but 32V/6A that have the useful output on/off button.
Thanks for the video. I just recently purchased the Longwei that you have. I was mostly conserned that I might damage it by miss using it. Thanks again for a clear explanation on the proper use.
Your black psu do turn off instantly, but it takes a while to discharge the output capacitors. If you connect a load and turn it off you will see that it shuts down almost instantly...
Great video thanks for sharing, it’s possible the kungber has residual charge in it capacitor/s and takes time to power down, be interesting to switch it off under load and see if it powers down faster. Thanks again for a very informative upload.👍🏽
That's a very good point - I'll give it a try.
If you want precise outputs of voltage & current use the power supply in tandem with digital multimeters & adjust voltage & current to your requirements. You can buy two DMM for $50 & now you have better metering for you bench power supply.
I'm with sreetips on this one man. Great job. thank you.
New subscriber trying to learn as much as I can before my Lithium iron cells arrive. You explained this perfectly not everyone watching understands what each piece of hardware being used is for.
So glad this helped. I made this video cause I was going through the same experience - I needed the most basic information when I started.
I know it's an old video, but it helped me get my head around how to use this. I'm using kind of the same purpose as you with lithium cells. Mine have dropped to 0v so bumping them. See if they are any use so putting them to 3.6v and testing the resistance. I'm not very good with electronics so doing this in the garage. I have built 10s4p packs and 12s3p for my electric skateboard but with new cells. I managed to get hold of couple hundred or so recycled cells see if i ca do something with them. Thanks for the quick video
i have one that has a special knob instead of a potentiometer style thing, and when you press on it, you can change which digit you want to change, so it works as a coarse and a fine knob at the same time.
plus, mine shows the max amps if you touch the amps knob for about 5 seconds, which is very useful.
This was super helpful, thanks!
Thank you. Recently got a similar power supply and really had no idea how to use it, so this helped tremendously! Thank you!!
I started researching how to use these because I thought the one I bought was broken! At 3:00 you answered my question! Don’t forget the rubber gloves! 🤣
This is what I spent all day looking for. Thank you and nice job
10/10 recovery on the camera drop.
Thanks, great explanation of the constant voltage/current issue as well.
Thank you for clearing this up for me. It was a complete mistory until I watched your video.
Very concise and helpful for a total noob, thank you!
Helpful immensely. I also read your safety message in comments too that is excellent too. Cheers hey!
Thank you so much. Now i understand it alot better. And how you explain it is 100% spot on.
9:50 not only destroy it but if you're not there you can set your house on fire with these
Well said very clear and easy to understand. Thank you.
Thank you so much for the concise and bs free explanation!
THE 30V10a UNIT HAS A HUGE DESIGN FLAW IN CC MODE!!! If you set it to supply - say 300mA @24 volts, then, because the meter is not overly accurate, you put your digital multimeter in series with one of the leads - on its 600mA max range then apply the power supply to its load, - the initial surge is waaay over and above 300mA - enough in fact to blow out the 800mA protection fuse in the multimeter!! in fact - i also tested it with a 3.15A fuse - that's over load by a factor of 10+ and it blew that too!!!
This is interesting and a good point. These are not lab or professional quality bench supplies. They are designed for amateur use, so they will not be precise and I wouldn't rely on them for electrical engineering or other precision applications.
Your video is very helpful and easily understood. Thank you.
Clear explanation with good examples, great video.
This is so helpfull dude.. i set mine to CV.. set my settings, connect it to my battery and it would go to CC.
But thats normal.. lol.
Thanks bro!
Thanks for making this video. Very helpful.
Thank you for video, my bench psu didn’t have detailed manual, this helped
It's the capacitors discharging. If you turn the switch off then touch the leads together it will instantly turn off. I can't imagine why you'd need to but thats why it has a delay turning off.
Thanks very much for this. Very helpful. Never new this at all! 👍
This cleared up a lot for me. Thanks!
That Kungber has two models, 5A and 10A. I wonder if the 5A can be modified to output 10A also. I bet they have internally the same components (for production efficiency by the manufacturer). It could be just one resistor affecting the max current limit.
Note and an assumption on my end. As far as the black one staying on longer and the white shutting off instantly my guess would be that they both are shutting off slowly the white just cuts off the display. Would both have caps they need to drain?
Great video This is exactly what I needed.
Very well explained for this newby 👍
great instructional video, thank you
Great video for me to learn. Thanks !!
Very good tutorial, exactly what i was looking for.
Best instructions video of all
Do you think one is more accurate than the other? I need to buy one soon.
Very well explained. I watched a couple other videos before yours and still had no idea how to adjust it. All I need it for is to parallel top balance 8 LiFePO4 280 ah cells.
I think in terms of accuracy they are basically the same, I didn't detect any noticeable difference between the two.
Thank you very much for a nice video👍
In my experience, you actually CAN set the voltage higher than that of the battery rating and the internal resistance of the battery will slow increase, dropping the current lower as it charges until the battery is fully charged.
That is true, except that if you leave it that way, you will eventually over charge the battery. But it can be done if you monitor it carefully.
Great video. The earth terminal. Are both power supplies isolated from earth . If you wish to get a positive and negative voltage can you connect the positive of one supply with the negative of the other
Excellent, thanks for sharing!
Great explanation, thanks for this video!
Great video. Answered all my questions.👍🏼👍🏼
Yes that was very helpful. Thanks I appreciate the advice
Your audio quality is very good
Very helpful video. Thanks 👍
That was incredibley helpful, thank you
Very good video my man. Best one out there!
Thanks for the video, awesome!
Wish I'd seen this video before I destroyed 2 cells.Thanks for the educational video and I will definatly be smarter from it.Cheers
That's too bad - but I had to learn the hard way myself as well.
I was hoping for an explanation of what happens when the voltage on that charging battery reaches the ceiling.
Excellent video - thank you!
Great video thanks !
hi sir. I just want to ask a question. will this type of power supply get damage if you always short using 5A setting in a long run. I plan it to use in studying laptop motherboard repair in finding shorted parts.
I have a Kungber power supply like yours and I have been using it to drive a small 12V stepper motor. Today, I went to go use it and it is showing nothing but zeros. Zero voltage. Zero current. Turning the knobs changes nothing. Any ideas on how to fix this? Is my power supply junk?
Great video, great explanation
Thanks for this
Well explained! Thank you.
Great explanation, no expert but I think it the manual says to adj. The amp with lower voltage(6v)
I don't remember reading that but it definitely couldn't hurt and is probably a good idea.
Great video mate , well explained 👍🇬🇧
I am sure you save my new batteries I would have never guessed that could happen
Thanks for sharing
clear as a day
Thank you for the Great Video.
Well explained. Thanks.