Nice idea. Some slight improvements could be made as the quiescent / standby current is very high for permanent connection to a battery. Increasing all the divider resistors on the left side of the circuit by x10 should help. Additionally TIP42 only has a hFE of around 15-75 so worst case only 777mA output current - better to use the trench P channel MOSFET like AO3401 :)
I finished the circuit. The transistor was replaced with a 4435GJ MOSFET, the resistors by a 10k and a 12k including a potentiometer to make it turn off below 5.5V, but before I connect it to my solar panel I have a question. Is the 220 Ω resistor optimal for any voltage or should I recalculate it?
@@Krzeszny95 the 220R is to set the base current for the transistor, but as you replaced it with a MOSFET this resistor value becomes less critical because the gate pin of the MOSFET only requires a voltage and will not draw any current. So yes 220R should be fine
Perfect (if skipped past 40 of 60 seconds of adverts and odd music). Content was nicely structured easy to follow and working principle clear enough to make modification. Supreb!
Hi there, I want to make variable input like 16V to 21V cut off at 15.5V , you think you can do some modification ?? I'm gonna be using Dewalt 20V battery to use LED lights and at the same time I want to protect my Dewalt battery from going too low on voltage.Thanks in Advance.
I don't know much about electronics but wouldn't this drain the battery even while in the "off" position? To me it looks like what is happening here is that you are using the (3.3k and 470) and 1k resisters to split the voltage. The TL431, if I understand the datasheet (which I probably don't), requires 2.5v to "activate". So, you are basically using the formula (Vin*R2)/(R1+R2) = 2.5 to determine what resisters to use. If you want it to shut off at 11v then you have (11*R2)/(R1+R2)=2.5. Anyway, as we can see from your diagram, in order for that to split the voltage you need the rest of the voltage to go somewhere across R2 (which is 1k in your diagram). So, my question is... wouldn't power be running through that 1k resister regardless of whether the TL431 is in the on or off position? Also, if so, would it be a lot of power/watts or just a tiny amount?
This is exactly what I was looking for. However, I tried the method described in this video with all the simulators I could find. I couldn't run any of them. Can you recommend a simulator where I can run the schematic here?
Is it possible to adjust this circuit to protect 14,4V and 18V batteries? - high current ie. 40A or higher - deep discharge protection: - 12V for 14,4V battery (max 16,4V) - 15V for 18V battery (max 20,5V) I'm looking for simple, failure-free solution to protect batteries in my tools. * Yes, I know it's better to balance cells and use serious bms but that's not a solution in my case.
I am probably wrong but I think the TL431 requires 2.5v to "activate". Thus the formula for a 13volt cutoff would be: (13*R2)/(R1+R2)=2.5. Or 13/2.5=(R1+R2)/R2. The 1k resister in the video would be in R2 position. If we do that for your 13 volts the formula becomes 13/2.5=(R1+1000)/1000. Becomes 5.2=(R1+1000)/1000. Becomes 5.2*1000=R1+1000. Becomes 5200=R1+1000. Becomes 5200-1000=R1. Or, R1=4200. So, the 470 and 3.3k resisters in his diagram would be replaced with something adding up to 4200. Btw, I know virtually nothing about electronics so I could be off on all of this. This is just my best guess based on what little I can deduce from his diagram.
Hello and thank you for the video. (I just subscribed.) It is super simple and extremely helpful. I did it for a 7.2v battery and it works fine. I have a question. Can I put bigger resistors so the open circuit draw less current? When the light switches off, it still draws a little current and it still drains a bit of current. Should I put bigger resistors? I used a 220 ohm resistor, R1 1500 ohm, R2 1000 ohm, and a 15k resistor.
I guess this will not work for lead acid batteries(Car batteries) as recovery voltage rise will cause continuous OFF-ON-OFF-ON-..... Is my understanding right?
How to chance discharge limit to 12.1v 50% capacity for lead acid batteries. how many amps can this device handle and can i use it for my solar battery bank with multiple batteries ?
Hocam paylaşımlarınızı keyifle izliyorum çok profesiyonelce yapıyosunuz keyif verici gerçekten, size bir sorum olacak ben kayar led devresi yapmak istiyorum bu konuyla ilgili şemanız veya video nuz mevcutmu ben bulamadım bu konuda yardımcı olursanız sevinirim şimdiden teşekkür ederim
I am looking for something to protect my mobile phone when powered to a wall plug (i want to set it as a camera in my room) in order to protect it from power outages because it happens often here, at the same time i have no background about electricity because i am a civil engineering student 🙂
Nice idea. Some slight improvements could be made as the quiescent / standby current is very high for permanent connection to a battery. Increasing all the divider resistors on the left side of the circuit by x10 should help. Additionally TIP42 only has a hFE of around 15-75 so worst case only 777mA output current - better to use the trench P channel MOSFET like AO3401 :)
Which resistors are dividers?
@@Krzeszny95 470, 3.3k & 1k
@@pyromaniac303 Oh, you were talking about the diagram. Thank you.
I finished the circuit. The transistor was replaced with a 4435GJ MOSFET, the resistors by a 10k and a 12k including a potentiometer to make it turn off below 5.5V, but before I connect it to my solar panel I have a question. Is the 220 Ω resistor optimal for any voltage or should I recalculate it?
@@Krzeszny95 the 220R is to set the base current for the transistor, but as you replaced it with a MOSFET this resistor value becomes less critical because the gate pin of the MOSFET only requires a voltage and will not draw any current. So yes 220R should be fine
Perfect (if skipped past 40 of 60 seconds of adverts and odd music). Content was nicely structured easy to follow and working principle clear enough to make modification. Supreb!
Hi there, I want to make variable input like 16V to 21V cut off at 15.5V , you think you can do some modification ?? I'm gonna be using Dewalt 20V battery to use LED lights and at the same time I want to protect my Dewalt battery from going too low on voltage.Thanks in Advance.
Brilliant. I have just subscribed. Can this be used for a 3s Ni-mH bms? Thanks in advance.
I don't know much about electronics but wouldn't this drain the battery even while in the "off" position? To me it looks like what is happening here is that you are using the (3.3k and 470) and 1k resisters to split the voltage. The TL431, if I understand the datasheet (which I probably don't), requires 2.5v to "activate". So, you are basically using the formula (Vin*R2)/(R1+R2) = 2.5 to determine what resisters to use. If you want it to shut off at 11v then you have (11*R2)/(R1+R2)=2.5. Anyway, as we can see from your diagram, in order for that to split the voltage you need the rest of the voltage to go somewhere across R2 (which is 1k in your diagram). So, my question is... wouldn't power be running through that 1k resister regardless of whether the TL431 is in the on or off position? Also, if so, would it be a lot of power/watts or just a tiny amount?
This is exactly what I was looking for. However, I tried the method described in this video with all the simulators I could find. I couldn't run any of them. Can you recommend a simulator where I can run the schematic here?
Which elements need to be replaced for 18v cut off?
instead of TIP42 transistor, which is the cheapest P channel mosfet suitable for 6 to 8.4 V(2s 18650 battery ) @ load current of 5-6A?
Good for inverter circuits 12volt to 110volt in automotive use. Helps prevent car battery from draining too much, and can't start vehicle after.
Is it possible to adjust this circuit to protect 14,4V and 18V batteries?
- high current ie. 40A or higher
- deep discharge protection:
- 12V for 14,4V battery (max 16,4V)
- 15V for 18V battery (max 20,5V)
I'm looking for simple, failure-free solution to protect batteries in my tools.
* Yes, I know it's better to balance cells and use serious bms but that's not a solution in my case.
Thank you sir , please tell me how can I make it to cutoff with 14v
Looks great, whats the max current draw ?
I don't think this guy is into answering questions.
I think it is up to 6amps so 6x12v=72 watts maximum. But I wouldn't take it to that point. Maybe add a relay so that the relay takes the load
I want use this for 20v battery 5s.. which components can I use?
Hello my friend, how do I turn on the led only after 13 volts or 13.5 volts?
I am probably wrong but I think the TL431 requires 2.5v to "activate". Thus the formula for a 13volt cutoff would be: (13*R2)/(R1+R2)=2.5. Or 13/2.5=(R1+R2)/R2. The 1k resister in the video would be in R2 position. If we do that for your 13 volts the formula becomes 13/2.5=(R1+1000)/1000. Becomes 5.2=(R1+1000)/1000. Becomes 5.2*1000=R1+1000. Becomes 5200=R1+1000. Becomes 5200-1000=R1. Or, R1=4200. So, the 470 and 3.3k resisters in his diagram would be replaced with something adding up to 4200.
Btw, I know virtually nothing about electronics so I could be off on all of this. This is just my best guess based on what little I can deduce from his diagram.
@@101perspective Thanks for returning friend.
How about 3.7v batt sir,how can we make low voltage auto cut off? thanks for response
Hello and thank you for the video. (I just subscribed.) It is super simple and extremely helpful. I did it for a 7.2v battery and it works fine. I have a question. Can I put bigger resistors so the open circuit draw less current? When the light switches off, it still draws a little current and it still drains a bit of current. Should I put bigger resistors? I used a 220 ohm resistor, R1 1500 ohm, R2 1000 ohm, and a 15k resistor.
This is best for 12 volt battery.I want use it for 54-47VDC low battery indicator.kindly suggest for changes.
Amazing idea. Better than those confusing eBay relay units that have so many modes but none of them work lol
I guess this will not work for lead acid batteries(Car batteries) as recovery voltage rise will cause continuous OFF-ON-OFF-ON-..... Is my understanding right?
Does the 15k resistance remain constant in the case of the 4.2 volt battery?
Yes, you can use 15k for 4.2v battery
great ...
can we use 6v battery in this circuit.
4.2 volt discharge.
which resistance are chenged
Change the resistor at the top. It's called R1
Helllo sir
Can i use low voltage drop , if 24 V DC to 20 V DC it will be work ?
How to chance discharge limit to 12.1v 50% capacity for lead acid batteries. how many amps can this device handle and can i use it for my solar battery bank with multiple batteries ?
I was thinking the same quest ,I like to know it to - grts from belguim
Perfect for my project!
Thank u!!
can the TL431 be used as battery switch with a mosfet?
Good video, but what about over-voltage?
add a not gate to the first transistor signal it should became a overvoltage protection
wiki that :p
waiting on my parts in 2 month to try it :D
Hocam paylaşımlarınızı keyifle izliyorum çok profesiyonelce yapıyosunuz keyif verici gerçekten, size bir sorum olacak ben kayar led devresi yapmak istiyorum bu konuyla ilgili şemanız veya video nuz mevcutmu ben bulamadım bu konuda yardımcı olursanız sevinirim şimdiden teşekkür ederim
What if you use a variable resistor to control the cut off? Will it work?
Ofcourse it will work
I like to set discharge voltage is 10.8v what will b the modifications in this kit
I'm new here so please reply with 6volt and above battery calculation for tl431 reference to positive resistors calculation
some dc leaking at load not fully cutoff function. battery draining
how to resolve the issue ?
Sir same is gud for 12/11.1/12.5 v lithium ion battery
Wire disconnecte mat karo uske bad se charging suru karo kya relay off hoti hai ya nahi
What resistors for cutting off at 3.85v
Excellent
Help
This circuit is cut when 11.8v
But i need low voltage at 10.5 then cut off. Please help
I also needed
Change the resistor at the top. It's called R1
Apakah bisa digunakan untuk sepeda listrik dengan aki 48 volt?
I am looking for something to protect my mobile phone when powered to a wall plug (i want to set it as a camera in my room) in order to protect it from power outages because it happens often here, at the same time i have no background about electricity because i am a civil engineering student
🙂
can u make for 20a?
Wonderful video. Can you please make a video like this for a 7.2v battery that needs to be discharged down to 6.5v please?
could you solve your problem?
Yes I solved it
This is a very nice solutions and it's exactly what i was looking for. I will order this from that site. Thank you !
How to make this for a 18650 battery?
Просто і доступно! Like!
Can adjust volt?
How can we make for 48v battery
How can i connect relay plz
which part has to be changed to cutoff at 10v
Change the resistor at the top. It's called R1
How to make pcb, can you help me?
Excellent video tank you.
alas !the tl 431 is not available,god work ,the substut ,?pleaz .../
How if use relay, sir ?!
Hahaha sponsored by allpcb this video no using pcb wtf ironic¡¡¡¡.
super video
I love the video content. Keep it up. Thumbs down for having music
What is the power consumption of this circuit, to switch function... At stand by condition
Someone said 2.5mA
Pla make thia circuit for 3.7 volt battery
It will not be good for 3.7 volt battery
why not use a potentiometer and have it adjustable just for the giggle? hehe
so i came once again to my own comment a year later lul
Whate about current out put
Depends on battery & the power transistor
Someone should sell these for cars with always-on accessory ports. Guess I'll DIY.
they sell them with obd connector and usb out for use with cameras and gps trackers all over ebay/ali.
@@notsonominal I had done a quick search for some but didn't find any. What keywords should I be using?
Nice job! Thanks for share!👏👏👏
Thank you
Mujhe specially powerbank wale battery ka safety circuit bana kar dikhaye
Good.
Thank you
schematic?
Awesome and useful for sure!
For reference voltage for regulator I rather use trimer
Low voltage cut off and high voltage cut off only minimum power supply trick speech bro
Please send image for layout white and black
Please give explanation how dose work step by step
Ap kanhase ho please bataiye
Nice
Thank you
How should cuttofff 9v??
Please use any online tl431 calculator
Good project
For 6 v battery
Change the resistor at the top its called R1. To discharge down to about 6.2 v put a 1.5k ohm resistor.
the only problem is to have the component !
I like this 1 subcrib
Thank you
show
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