Constant Current Load Addition to ZB2L3 Battery Capacity Tester using only 5 Parts!!!
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- čas přidán 27. 07. 2024
- In this video, I will show you how to add a Constant current load to this cheap battery capacity tester module. The circuit is very simple and all details needed are all in the video . If you want to ask something,feel free to put it on the comments section,
THANK YOU
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Very nice, what great addition to a battery capacity tester, I was actually looking for how to limit current in my DIY bench power supply that looks kind of like yours(minus any current limiting capability) and this looks like it will do it! Sweet! I also have a DIY capacity tester using arduino and this will be perfect for that. Thanks.
My pleasure bro.
Thanks for the time👊
Thank you very much !! I've build your design with a Siliconix SMP 60N06 MOSFET and a KA358 dual opamp. It works perfect !!! Many greetings from Landgraaf, NL.
Thank you brother
I have correct myself, one can better use the IRLZ44N MOSFET because the SMP 60N06 is not really suitable for this application. I've tried the STP40NE03L-20 and this has better results, but it gets quite hot.
Thanks from Brazil, I wanted to do exactly this circuit but I wasn't able to connect
2 on irlz44N only connected to load plus?
5:02
How you can keep ZB2L3 module in ampere mode (green LED) for long time and this project is really cool and innovative.
Press the "OK" button sir until it is on the Current Display, it will display for a longer time
@@x3dtronicsph Thank you....make more useful content like this....♥️
👍👍👍👍🎇🎊💥
another question i overlooked in the schematic the pin1 of the pot it says GND but from your circuit i see that pin1 isnt connected to Vin ground, and also in circuit the overlapping leads from pot pin1 and pin4 of lm358 doesn't have a dot, so do i not join pot pin1 and lm358 pin4 to Vin -ve terminal or leave it unconnected?
Basically, the pot is just an adjustable voltage divider.
Both ends of the pot should be connected to the Ground and Vin to have a voltage reference of 0-2.5volts.
Sorry for the missing dot.
thanks i was just confirming not connecting pin1 on the pot doesn't make sense anyway@@x3dtronicsph
Thank you for the informative video.
I assembled the same parts. Then I connected it to ZB2L3, but the current remained at 0mA and did not change. I tried connecting -Load to GND and it started working. In the video it was said that -Load does not need to be connected to GND. What should I think?
With this, I was able to measure batteries with small capacity. Thank you very much.
Initially bro, the -Load and Ground should be isolated, When you press something and the discharge starts, the MOSFET of the ZB2l3 will automatically connect the -Load and Ground.
If you directly connect -Load and GND, you will get an Error5 because.
Everytime you put a battery, it will automatically discharge because you bypass the Mosfet of the zb2l3, that's why i isolated it
@@x3dtronicsph Thank you. When I compared the ZB2L3 you are using with mine, it looked a little different. I bought it recently. There is a description of HW-586 V3.0. It seems to be working fine now, so I'll try it some more.
Hey... another question
i am made this same Circuit, with 1.5 ohm resistor instead of 1 ohm but...this circuit can drain maximum of 700mA....what should i do now....!?
Try changing the 47k resistor with a lower value
@@x3dtronicsph Ohh....I have tried 100k and 10k potentiometer also, the result is same as before which is 3.5volt (output of op-amp), so the gate of mosfet is not fully open. That's why I tried using 6.4v input instead of 5v input, now 5v is coming (output of op-amp) as a result the gate of mosfet can be opened completely.
[Voltage drop by LM358 is ~1.4volt]
what will happen if i use a 10ohm 10 watt resistor instead of the 1 ohm 10 watt you used?
its almost impossible for me to get low ohms high watt power resistors around me, please reply
1 ohm and below (for other circuit designs) is Needed here sir sadly.
With 10 ohms resistor, 18650's have max voltage of 4.2 volts, and using ohms law.
4.2÷ 10 is equal to 0.42.
Thus you can only draw a maximum current of 420miliamps.
That's it
@@x3dtronicsph i was going to use parallell resistance law to bring down the overall resistance but i thankfully found oonly one piece of 1ohm10 watt thankfully
great video works perfectly
Can i use more Powerful MOSFET like the IRF3205 has it has same in voltage ⚡ but it has less energy loses has heat and it has less resistance and this one can do higher current draw so i should be able to get away with smaller heat sink on this vs the one you used?
Yes you can use the MOSFET you've mentioned.
It will still depend on the the battery voltage and current discharge
@@x3dtronicsph I got small heat sink but I I wondering if it's possible to screw hole into big heat sink I wasn't sure if I could has I can't find one that can I get with bit I could
screw in
I was wondering if I could put hole into it so I could use it has big heat sink@@x3dtronicsph Aluminum Heat Sink 300x140x20mm
@@x3dtronicsphI was wondering if you could do video taken you're time to explain where to connect very thing has I am bit of noob at this stuff and I think I might of connected wrong thing because I am used 101 video about where to connect very thing and I am not sure where to connect very thing so I was wondering if you could help me out bye doing extra video on this schematic bit make it bit more clear and maybe show it more easily understood for being new to making this stuff
The CC circuit is based on the load resistor AND the fet to share the disapative load heat. Most to220 fets can disapate 50W when properly heat sinked. But the discharger has a max current limit it can read, so using a better fet won't help or hurt
Which IC did you use?
Lm358, Lm358p, Lm358N
It's LM358p bro.
You can also use Lm393 or other comparator Op-Amps
Hey...one more question can i use STP55NF06 insted of IRLZ44N MOSFET...?
Ohhhh.
I've rechecked it.
You can use it bro.
It's the same voltage threshold with the IRLZ44n.
Nice nice
@@x3dtronicsph Thank you brother....♥️
Im still New to electronics, i see you comented that you use lm358p, can i use standard lm358?
Yes of course, just make sure it's a working Op-amp, Lot of Fakes nowadays
Thanks
@@x3dtronicsphumm, I have made the module, but why mine does not work, I have used Lm358P, when this module is connected to zhiyu, zhiyu read it 0.10 which is usually 0.06 and in the video you said that the mosfet will be hot, but what I have is not at all, can you help me? I try to use a separate power supply and the results remained the same
When i test the battery and turn the potensiometer The current read unchanged remains 0.00
Can I use a signle LM358 to control many Mosfet? I plan to make multiple 18650 slot tester with constant current control. Thank you for your advice
You can try , but add around 1k resistor on it's gate probably, Because if other MOSFET go shorted, it can protect other MOSFET, cascading MOSFETS is possible with Dummy loads, but if you're gonna use separate batteries every MOSFEt, i guess it's a bit complicated
@@x3dtronicsph Thank you for advise, I googled it recently and found that my idea is not good. People always suggest to use 1 IC : 1 Mosfet. For now, I plan to only share the potentiometer and the rest components will be separated. I have another question. I need to increase maximum discharge current. Apart from parallel multiple Z2BL3, can I modify the Z2BL3 directly like change IC or Mosfet? Thank you again here :)
Sadly, the ZB2L3
is programmed with only Max 3 Amps of current, thats Why i only designed it with 2.5amps max only, evem you change the ZB2l3 mosfet, the current reading is based on its Shunt Resistor, so I guess you need another version of Discharger if you want higher current
@@x3dtronicsph Hi, is the current fixed to specific value and independent to the voltage of 18650? Like I set 1A at 4.2V at the begining of test. Is the current will drop when the voltage is approaching to 2.75V which is consider as 0%? I have the discharge device which can maintain current until the end. I hope that solution in the video can achieve the need.
Another question, I could not find 47k Resistor. What is the purpose of the resistor? Can I remove it?
Thank you sooo much
The current is Constant bro at any voltage (minimum of 2.5v) , the purpose of the 47k resistor is to create a voltage divider with the 50k potentiometer to have a limit of 2.5A of current, (2.5volts reference for the opamp since the supply is 5volts) . The module can only handle up to 3Amps of current. If you don't have that 47k resistor, you can use any Value, but the potentiometer value should be close with that resistor value. Example, 10k resistor with a 10k potentiometer
Can it work with alkaline battery from 0.5v to 1.5v ?
Yes.
The module can handle those voltage level up to 15volts.
I recommend to set the current to around 100mA only for AA and AAA battery sizes
@@x3dtronicsph would it be possible to draw 100 ma cc load from 4.2v battery without heat sink?
I calibrated
It shows the voltage and current correctly but the total current is doubled. How can I find a solution?
You need to recalibrate it again.
You probably did some error in the current calibration
@@x3dtronicsph I tried many times but the result is the same
I made the same circuit with irfz44n but it doesn't drawing any current
It should be a Logic Level MOSFET sir.
IRLZ44N is Different with IRFZ44N
@x3dtronicsph cannot find irlz44n is there any alternative mosfet plz tell me
Should work many times the mosfts are faulty make sure to buy ior brand one
Why add CC load? The ZB2L3 adjust is current counting to keep accuracy correct. I have tested this many times.
Yes it's true. The actual main reason i made this addition was, to have an easy selection of current when using different kind of battery Voltage ang Battery type. It's pretty annoying to change the resistor value every time, also having a CC discharge improves the discharge speed because, Batteries decrease voltage over time and decrease current as well. Relying in a Steady resistance for different discharge setting will be way better if you have an adjustment knob for it, thank you
@@x3dtronicsph yea, that makes since. Do you know the max current the device can measure? What's the current sense resistor and max adc voltage?
Max current is only 3amps, i didn't measure the voltage drop across the Current sensing resistor at 3 amps, but for me. 3 amps is pretty decent. For low power batteries only.
@@x3dtronicsph When calibrating the 1A current, measure the voltage across R020, calc the resistance. Half the resistance, now you have 6A (changing the fet too), or anything higher current.
How if i want to discharge 20ampere?
You can't.
Zb2L3 only support 3Amps of current
You could modify the current sense resistor and fet on the board (remove them and use external), you should probably use multiples of 3a to make reading the display easier (in your head calculations)
is there a way to put a fan while discharge? can you make a video?😅
What do you mean??? The Fan will start automatically when the discharge starts???
@@x3dtronicsph yes in resistance. can you make a video how to put mini fan to resistance.
Well, you can make another comparator circuit just like the current Load, but the output of the opamp will turn a transistor on, you can connect the fan to that transistor
@@x3dtronicsph where can i find the transistor? and how to connect. make a video bro. many people want to learn, just like me as beginner 😅
1:20 what if i used the same 47k resisor but instead of 50k pot i was to use 10k pot has i its cheaper for me buy 10k pot than 50k pot
No bro.
The purpose of the 47k and the 50k pot is to have a voltage divider.
I did that to limit the reference voltage of the OP-amp to 2.5volts (2.5Amps of current) because the module only handle max 3Amps of current.
IF YOU ARE GOING TO USE A 10K POT.
Replace that 47k resistor with a 10kilohms resistor.
Thank you😁
@@x3dtronicsph thank you for letting me I just have one more question what's the rating power rating needed for resistor and potential menter does it matter ?
Minimum of 5watts is good bro.
The most important thing is Adding a "BIG" HEATSINK to thE MOSFET.
that mosfet will dissipate a Lot of power.
What potential "menter" do you mean?
@@x3dtronicsph I was on about power rating for voltage divider sorry if this makes you get confused about it
0.0025 watts is the power dissipation of the voltage divider section.
Any resistor can handle that very Little Current.
No worries
I use this device. When I tested the damn battery that said 5000 mah, the device said the battery was 150 mah. I am not sure if the battery is fake or if the device is of poor quality.
Well it depends on the current you've set sir, if it's a Low Quality battery, most likely with High Internet Resistance, it cannot give high current, so if you discharge it with example 1Amps of current, that battery will drop it's voltage and the discharge Test will stop. Try it with Lower current discharge
@@x3dtronicsph How many volts should I choose for discharge when performing the operation? I tried 3.0 volts before. But I couldn't get a good result. I wonder if it will work if I test it with 2.5 volts?
@Elshan_Mammadov_ try to decrease the Current first bro. Try to load it with 12ohms resistor instead
Is pin 8 connected to 2 on the irlz44N?
Boss pwede mag pagawa niyan?
Kung malapit kalang boss.
Pwede sana eh