Constant Current Regulator using Transistors & OpAmp | CCR | Constant Current Regulator.
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- เผยแพร่เมื่อ 22 พ.ค. 2024
- #foolishengineer #ConstantCurrentRegulator #Opamp
0:00 Skip Intro
00:33 what is the current regulator
01:48 Current regulator application
02:10 Current regulator design
03:15 Current regulator using TL431
06:36 Current regulator example
08:25 Simulation of Current regulator
09:27 Advantages
08:44 Disadvantages
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And just to add one more note regarding the explanation of circuit operation. An op-amp is an analog device that smoothly changes its output voltage; therefore it is not appropriate to say "logic high output" which "turns on the transistor". The op-amp senses the change in its input differential voltage and instantly reacts to it by starting to change its output voltage until it restores the equilibrium.
A great movie! Just to note that when there is a permanently connected load there is no need for a base resistor because the transistor itself limits the base current by increasing the emitter voltage.
what if the VS for the op amp VCC has lower than VCE on the BJT? do I need some circuit configuration. example like VS = 12V, and the VCE is around 80V or above
Finally I able to understand
This was pretty cool! Care to do a practical application of this circuit? R2 would be a 20S/82v li-ion pack. Max charge current would be 60 amps.
Awesome video, keep up the good work ❤️
Thank you so much for watching!! Please don't forget to subscribe to our channel
Great video. Thanks
Thank you so much for watching!! Please don't forget to subscribe to our channel
Is there some reason not to use a lower voltage zener? Wouldn't that reduce the power dissipated in R2?
Can we use this kind of system for a welding machine design of 0-200A and 0-50v ?? How can we varu thecurrent and voltage
bravo....
Very informative video.
Pls. use color font without background shading for subtitles which make enable to see portion of diagram behind it.
Thanks men
What software do you use for the animations?
Nice Video!
Thanks!
And how much is the total voltage drop of this circuit? Can i use a 3,7 volt battery for this circuit?
Hi, is this a switching or a linear circuit?
Can u plsssssss make a video explaining on how to vary voltage n vary current in this system
How do you build a high current regular?
Can you suggest some improvements in the circuit ?
Dang it lol, I'm trying to drive an LED circuit that requires a constant current at around 2A using 48V as Vref. The calculated power dissipation for the discrete components is obviously off the charts. Is there any other constant current regulator circuit that can be used for higher current applications?
use PWM LED drivers
@@FoolishEngineer Thanks!
Hello, i followed all of your videos about current limiting circuits but all have the disadvantage of not being able to control high current. For 10Amps , which one do you recommand ? Thanks !
I have also same question
Can you please clarify
So how to design a protected 4-20mA current source
6:28 is Vref in the load current equation the average voltage seen by the load? Because it in theory should toggle between 0 and 14 Volts, right?
Not really ....
Once the load current reaches the set value , this will produce voltage across it equals the ref voltage = zener voltage
this will switch of the transistor before the voltage across the load reaches Vcc
so the load will never experience 14v across it
@@alaanoor3679 good point. But I can't yet see weight Zener voltage is voltage of R2... I mean there's also load resistance and R3 involved here
@@ThomasHaberkorn
ok ... lets take it point by point
you use the Zener to set the voltage you want across R2
this is your starting point
if you want 5v across R2 , you buy 5.1v Zener
or if you want 9v across R2 , you buy 9.1v Zener
at zero second , there is no voltage of current across R2
once the supply starts , the transistor is ON and the voltage across R2 starts to build up to reach VCC
but .... before that happens , once R2 Voltage reaches Vzener , the transistor will switch off
so the current will drop
once it drops , the transistor will switch on again
and so on
Why R3 ?
it is to limit the Zener Reverse Current within an acceptable value ... otherwise it will burn , just like you do with an LED
you put R3 in order to keep the Zener reverse current between 1 and 10ma , usually 5ma
so if your supply voltage is 12v , R3 = 12(v) / 0.005(A) = 2400 Ohms (2.4k)
@@alaanoor3679 awesome explanation, thanks 😊
@@ThomasHaberkorn Glad i can help Thomas
Thank you for this beautiful video. Any help for high current applications?
No, this for low current only
What is the software you used for simulation?. Thanks in advance.
LTspice
hi bhai, i have 24 votlage solenoid, if check the voltage near solenoide it is showing 24v, and if i check current it is varying from 0 - 650 mV, the coil is mounted on the hydraulic jack which is controlling the speed of jack, and the coil is being controlled by potentiometer, how can i make the circuit to make it happen,
First you will have to consider that 0-650 mV isn't a current.
Then, Google is your best friend. There tons of resources for driving solenoids.
@Oscar Gr bhai it was a typing mistake it 0 - 650 mA
@@rizvanrazi4698 Of course. But my point is a solenoid is a device controlled by current. (Not voltage)
Sure, they print a voltage on it because the manufacturer knows the resistance of the coil (for DC) and most electric sources are voltage sources.
If your source is AC it's already different.
Did you find a circuit online yet?
Hi, wish topology is better for 3A charger?
PWM
Can you use a mosfet instead of a bjt?
yes
How do you make sure the transistor is in linear region please
By adequate (normal) current through the emitter resistor.
whats the max AMP this circuit can control?
Depends on the Power handling capability of transistor
😘😘😘
Bhai!!
Ac constant current source circuit plz,
Thats what the video is about FFS.
Why did you choose 6.2v zener instead of 2.2v zener since the zener voltage should be the same with the load voltage