Anti kickback diode
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- Опубликовано: 19 окт 2024
- Anti kickback diode
In this video we take a look at the inductive kickback from a DC motor and how it can damage your circuits. The use a diode to block the kickback and observe on the oscilloscope how the spurious voltage is lowered.
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Also a good idea to put the anti-kickback diode on relay coils or any other inductive DC load. Great video simple but elegant...
Haven't seen that done in Control Panel bild ups. But I like the idea.
I spent almost a full day trying to figure out why a relay would trigger on a completely electrically isolated arduino every time my electric (actuator) lock reset. Turns out it was sending a little EMP and pulling that (completely separate) arduino pin high. Felt like voodoo until I put a diode in.
I think that's noise coming from commutator and long leads so cap there should be fine. Flyback diode is used if PWM is used for speed control. Usually this is integrated to H-bridge. This is also needed when controlling all inductive loads with semiconductor.
After a long day at the office, the intro to this video is about perfect for my intellectual capacity this evening.
This has become an addictive channel. Thnaks.
Cool, something I learned long, long ago when I was a young lad serving our great nation in the United States Army, circa 1970-77, but have long since stored away in a dusty cobweb filled corner of the old gray matter. Nice to pull the idea out and shake the dust from it occasionally. I recall when I first saw this sort of thing, I was shocked, in horror for that matter till I realized the working of a diode, and seeing a capacitor across the poles of a power supply, why that was a shock indeed because I always looked at components sort of like a piece of wire, and I just knew if you crossed the poles with a piece of wire, excessive heat and fire were just seconds away.
Do ESP8266 or similar chips like ESP 32 come with firmware flashed in it or do we have to flash the binary files ?
I am having trouble interfacing NodeMCU based on ESP 32. I am developing my prototype on Simulink which officially supports Arduino and ESP 8266...
Share this man's videos. He needs to get recognition.
I call this a clamping diode (clamps the voltage spike) but same thing...great demonstration
Just found your channel, really enjoy your “common sense” approach to electronics. Thank you for sharing your wisdom!!
What would be a protection circuit for a reversible DC motor? The diode would be a short if you attempted to reverse the motor.
The extremely useful diode. It’s always good to get reminders about the many ways a diode is useful. Great reminder Paul, in fact I was thinking about how to do this with a motor that has to spin in both directions just yesterday. Unfortunately I do not have an elegant solution for that.
Most h bridges have diode clamping built in. If you used a mosfet then it has a parasitic reverse diode already built in.
Glad to see you're feeling better!
Nice to see this transistor circuit👍👍 Until now I only used a Mosfet for this with a 555 pwm circuit. But this looks a lot more basic and easier and off course less components, which I like 😊
I am making a circuit that has 4 buttons to allow you turn the motor both ways and it uses 4 transistors because of a password lock that I made for it, so how would I use a diode if the motor goes both ways? Thanks and I love your videos and they teach me a lot.
Commutator Noise. Adding a Cap would loose most all that remaining noise.
Yup, usually those motors have disc caps already soldered on the terminals for reducing noise so it does not get to the antennas, a.k.a. cabling.
Simple video but instructive. Thanks!
you can forget easy when starting off at this stuff that a motor has property's like an inductor and always needs protection. i liked the difference on the scope...
I WANT TO PLAY WITH THAT LITTLE TOY TIRE LOL.
Question from a real life noob. Would the addition of an electrolytic capacitor, also in parallel, reduce that ripple further? Love the videos, by the way. Thanks
I gave a thumbs up as soon as I heard the song.....( I always give a thumbs up btw) :D
I've used a small cap across a motor before but this is new to me. I like the differences on the scope, is the change as dramatic with just a regular diode? Thanks for the video!
In the days when cars used points in the distributor the ignition spark occurred when the points opened, not closed, for this very reason.
Is this the same as what they call a "flyback" diode? The waveform looked to be similar to a tank circuit ringing.
Paul, thanks again! Is the spike also called back emf?
Yes
What about reversing polarity on the motors? Would adding a ceramic cap do the same?
Pretty sure the noise from the servo motors killed my esp32 camera. So I'm looking for ways to reduce the noise.
Seperate supplies for the servo power is normal a good start.
@@jonelectronics510 I wanted to use a single source for power on my arduino bot. Maybe a separate buck converter with a separate ground will work.
@@webslinger2011 usually the biggest problem with servos is not the noise but the sudden current draw dropping the power rail momentarily. If you are using a shield board you might find the on-board regulator too weedy to handle it.
@@jonelectronics510 Yeah, you're right. I'm experiencing errors with dronebot's workshop robot car arduino sketch when I include the servo library. So I've used a PCA9685 module instead. Still experience sudden voltage drops running the motors.
You should have added a 100n cap there too.
This always confuses, me, anti feedback, anti parallel diode, kickback diode, flyback diode, and there is one more I forgot, are they all the same thing?
tablatronix yes, they are all just diodes. However the names are just descriptions of how they are used. You get different types of diodes though, like schottky and standard silicon rectifier diodes and germanium diodes etc.
Just like pull up and pull down resistors are both just resistors where their placement in a circuit determines whether they are called pull up or pull down for example.
I'm used to seeing the load switched by the collector. Any reason you did it that way or doesn't it matter?
Good question.
Not sure how accuarate this is but gives some insight.
electronics.stackexchange.com/questions/38285/connect-load-to-collector-or-emitter-of-transistor
Very important information, thank you. What about an electrolytic capacitor?
No, a polarised capacitor would be reversed when the motor switches off. A ceramic capacitor of 0.1uf would be a good start across the motor terminals
I'm thinking you need to send your transistors to boot camp to toughen them up.
1:50, should be 10V per division. Your channel two is 2V and it is disabled.
Good Job... #NSElectronics
i killed a lipo protection circuit that way :P
Sometimes see caps on those what is that about?
This is also called a flyback diode
How would a ferrite bead function instead / in conjunction?
At first it sounds like any inductance would make the problem worse.
@@benbaselet2026 Okay, thanks for replying! I thought that an inductor would dampen high frequencies?
@@friedmule5403 It's not quite that easy. Every circuit has capacitance, inductance and impedance. Every circuit is an oscillator and a filter, it just depends on the parameters and frequencies how everything works out.
I'd add noise killing disc caps to the motor terminals first, usually helps a lot to dampen the random high-frequency noise.
@@benbaselet2026 No it's never that easy... unless you can just ad a single diode and deal with most of it:-) I am glad that you use your time to explain it to me! My thought were that the noise had a lot of HF so a sort of filtering, maybe could dampen or at least change some of it. It could be fun to see:-)
@@friedmule5403 A very good experiment for sure and easy to do if you have a scope. Very recommended :)
Classic
This setup does not work when we want the motor to spin in the other direction. Who would want their bus to go only forward 🤣
MOVs are the way forward.....and backward.
Great video. Thanks. But.........two words......"singing? NO!"
Great tune though.
@@jdmccorful My Grandson's favorite, he is 1.
Little wonky on the axle there buddy.
Instructions unclear. Thank God I had a SawStop, I get to keep my fingers so I can unsubscribe. Terrible advice.
Interesting, normally kickback (in the UK) is referred to as the switch off kick of a motor (and the collapse of the magnetic field), not the continual ringing that you are showing.
I was taught roughly the same. It being the spikes seen when an inductive load is switched on or off creating the large reverse-bias voltage.
you can forget easy when starting off at this stuff that a motor has property's like an inductor and always needs protection. i liked the difference on the scope...