Direct Current Control

Direct Current Control - Inductors

День тому

An introduction to switching current regulation making use of inductors. We test out the theory of stored energy in inductors, and utilise one to smooth current from a switching MOSFET. We then look into the need for a flyback diode in such a circuit, and finally consider the basic options for control schemes.
What happens when:
0:00 Introduction
0:19 Why current control?
2:17 How inductors will help
4:23 Target current hysteresis (DCC)
6:44 Does the theory hold up?
9:12 The BIG problem with inductors
11:12 How a single diode can fix the circuit (flyback diode)
13:06 Controlling the MOSFET using PWM
17:32 But this circuit does nothing?
18:30 Conclusion
18:42 Outro
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КОМЕНТАРІ: 42

@d614gakadoug9 7 місяців тому

In the waveform where the voltage is going to 85 volts, that particular voltage has nothing to do with the inductor, as such. It is the result of causing the body diode of the MOSFET to avalanche. It stays at the avalance voltage until the energy stored in the inductor been discharged. Avalanching the diode can be destructive if there is sufficient available energy/power (they are generally rated separately, hence the slash). In some circumstances it is perfectly safe to allow it. Note that at all times the drain of the FET is positive with respect to its source.

@hogeojin 9 місяців тому

Really nice explanation with real components and scope screen.　Thank you!

@markkrumpelman3973 9 місяців тому

Best an most informative video on youtube for simple circuits, for all of us that only know basics. Please keep them coming. Thank You

@electrarc240 9 місяців тому

Thanks, more to come!

@irfansami3335 3 місяці тому

Best video I ever had. Answers to all of my question going in mind. What inductor is doing in the circuit,... :D

@mike-yp1uk 8 місяців тому

Totally awesome video and I've never heard it explained like this.

@bennetting1609 Рік тому

More ElecrArc in my life is always a good thing, keep it up! Also that's a fancy outro you've got now.

@jj74qformerlyjailbreak3 9 місяців тому

My arsenal full of great content said your channel will fit in just nice and never sooner. New Sub earned. Well done. Well done.

@mertali7605 Місяць тому

Good explanation, thanks.

@electrarc240 Місяць тому

Glad it was helpful!

@RichardFreeberg 10 місяців тому

A wee bit of calculus without mentioning it. Nice. LOL. Seriously, I like the presentation. You would have lost a lot of the audience if you'd gone the full dt/dx and first second derivatives, eh? The fascinating thing is how dynamic inductance / capacitance phenomena are, and how our 'maths' can tame them! Thumbs up!

@yt4krist0f Рік тому

Perfect explanation, enjoyed to watch, keep on going!

@peterlethbridge7859 Рік тому

a really good video, well explained, smart young man.

@makimcleary393 Рік тому

Great explanation as always. Thank you very much, I'm looking forward to the next ones!

@electrarc240 Рік тому

Thanks, glad you enjoyed it!

@HTSpecOps Місяць тому

Awesome video, subscribed !

@electrarc240 Місяць тому

Thanks for the sub!

@endidasdis Рік тому

Very informative, thanks a lot

@electrarc240 Рік тому

Thank!

@kabandajamir9844 10 місяців тому

So nice thanks

@MickHealey Рік тому

I like these videos. Very clear and well explained. I also learn stuff :-) Well done and thank you.

@electrarc240 Рік тому

Thank you very much!

$@kevinfrack8217$

@kevinfrack8217 Рік тому

I'm stuck on a problem I need a solution to! Think this video may be close to the solution. I need a Vampire power supply, that can give a regulated 5v dc @1amp, No matter what the AC input voltage is. An operational example: Have an electronic dimmer on a lighting circuit say 100w bulb we need to generate the 5v dc no matter what that Dimmer or Variac is set to (20 to 100 percent) Any help is be appreciated. Love your videos they are very Good, You right get to the point, and you are good at making them understandable for us average folk.

@electrarc240 Рік тому

A simple linear regulator like a generic 7805 is the simplest way to get 5VDC@1A, I would use one of those as the final stage of a PSU, but they can only take up to around 35VDC on the input so preceding that you'd want something else. simplest would be a transformer with a rectifier such that the output would always be between 35VDC and maybe 7VDC. this wouldn't be very efficient or compact though. Really you want a switch-mode PSU which you could maybe achieve by rectifying the mains directly then feeding it through a circuit similar to this, but with voltage feedback rather than current. This wouldn't be isolated though so definitely shouldn't be used for anything a human could come into contact with. I'd look into buck converters, or forward converters if you need the isolation.

@shawncalderon4950 Місяць тому

Superb presentation skills! I have watched a lot of UKposts on the topic, and few are as good as this channel. I wonder if the glamor face close-ups are a bit off-putting to the browsing electronics hobbyist. Keep the camera on the topic and let your butter voice unravel the near-insurmountable mysteries of electricity.

@electrarc240 Місяць тому

Thank you very much! And yes I’ve been working more on hiding my money maker!

@shawncalderon4950 Місяць тому

@@electrarc240 Please forgive my rudeness. You are a gifted, talented, genius teacher; let no one tell you otherwise!

@electrarc240 Місяць тому

@shawncalderon4950 ah don’t worry you weren’t rude I’ve had much worse haha! Thank you again, I’m hoping to make more videos in a few months when I’m done with uni.

@shawncalderon4950 Місяць тому

@@electrarc240 Is uni short for university? I'm a retired military veteran from Chicago and am unfamiliar with that abbreviation.

@electrarc240 Місяць тому

Yes it’s for university. I will be working next year so should have more time for this. I’ve been very busy this year

@lorddonpromillo4836 10 місяців тому

Love the videos. Keep ingoing. Pretty sure the youtube algorithm will push you soon :-)

@electrarc240 10 місяців тому

Thanks!

@ghanrajsingh7347 Рік тому

Like your videos sir

@electrarc240 Рік тому

Glad to hear that!

@Enigma758 10 місяців тому

Wouldn't a capacitor at the output reduce the ripple?

@electrarc240 10 місяців тому

Adding a capacitor can lead to a less uniform current waveform which makes this kind of very basic control less stable. If you make this circuit properly with a microcontroller adding a capacitor would make more sense. I will try and make a video covering that in the next few weeks if I find time.

@johnconrad5487 Рік тому

college student? equations are good except that E = - Ldi/dt. you connected the scope clip to the positive power and the scope readings are upside down. seems like a little bit of a mess. when you first saw the flyback pulse going down that should have been your clue to correct the scope probe connections.

@electrarc240 Рік тому

The clip is on the source terminal of the MOSFET to allow simultaneous measurement of Vgs, Vds, and Ids (inverted). Connecting different ground clips to different potentials would have resulted in a little bit of a mess.