Electronic Switches - SMPS and snubbers (2/2)

[@airmann90]

Your videos absolutely kick ass. So many channels out there that don't dive into the actual practical calculations/testing of circuits, they just say hey, yeah, use a snubber bud ... your style of theory video leading to a practical bench video is the best.

[@w04h]

Extremely underrated channel! Well done, great video!

[@MrJustwatchandlisten]

You should have more subscribers! This type of content with real practical explaining are great!

[@Graham_Wideman]

Excellent methodical exploration of the variables influencing the results! Well done!

[@sggtav]

Great explanation! Something important to notice on this switching power supply design is that the diode also has a capacitance and it creates a new current loop that need to be considered during commutation. In this design I would recommend placing the diode close to the switching node and the snubber after. In that way, you reduce the loop inductance, as you showed, plus the current loop across the diode (due to internal capacitance), gets improved == better Emi.

[@jeanaimarre8605]

Amazing demonstration about quite difficult matter…

[@carlosdanielmendozaperez6907]

Keep doing such great videos, congrats.

[@maxpetrelli2142]

Simply Bravo !!!

[@hedleyfurio]

👍A video setting out how a buck converter dynamically changes the input impedance depending on the load , how to simulate this and how to measure the input impedance will really help me to understand how an Mppt charger “ throttles “ output from a solar panel array when source power is greater than the load power required 🙏

[@Graham_Wideman]

Maybe I'm misunderstanding your question, but.... doesn't an MPPT (Max Power Point Tracker) use feedback to adjust the current drawn from the panel so that the resulting voltage produces max (voltage x current)? The impedance per se would then be R = V/I. And that in turn is really just the MPPT controller "learning" the I vs V curve of the panel under current illumination conditions. So, averaged over seconds, the MPPT's "input impedance" is just given by the panel's I vs V curve (for that level of illumination). On a shorter timeframe, the MPPT controller feedback loop "hunts" up and down the curve a little to seek out the max power. I think this is easier thought of as variations in how much current it draws, though obviously impedance could be calculated, On the very short timescale, presumably there's some variation in the switching duty-cycle of the MPPT input stage, though I assume there's an input reservoir capacitor to smooth that out and suppress noise.

[@hedleyfurio]

@@Graham_Wideman MY setup is : " All in one inverter " which includes an MTTP controller and the inverter is ' bi-directional . Solar array 6 panels in series produce 3KW under ideal conditions i.e. 300VDC @ 10Amps . What I need to model is how Controller dynamically adjusts input impedance seen by the solar array , proportional to system load . e.g early morning load is 270 watts but panel produces far more , so I guess excess power not used is dissipated by the solar panels as heat. LTspice model of buck converter where the load can be adjusted and the input impedance varying proportionally shown on a graph is the goal.

[@dipubiswas8520]

Hello & Welcome.... Your videos are very informative..... Keep up this work

[@SignalProduct-be2js]

great explanation... well done!

[@rahulrohit2445]

Please explain snubber testing in SMPS

[@Mr.Leeroy]

Once again, you make other EE channels look like a joke, mad respects. Was there a video on triac snubbers already?

[@FesZElectronics]

I'm happy you enjoyed it! Regarding the triac topic, I have not discussed that so far, maybe sometime in the future, but I have no plans yet.

[@billfischer7085]

I love your work, I actually pause and take notes. I have asked several top u-tube pros about snubbers, you hammer out the best and complete picture. The others give good but the same little 12 volt relay and one diode for fly back. Would you Please do a session on a 48 volt pinball solenoid and 4 Amps rushing through in 100msec. then it is snaped off. Down the circuit a npn darlington or mosfet does this. I keep hearing the mosfet has a diode inside. well I also have seen the coil wants to drop the magnetism at the speed of light and will produce 5000 Volts or more on any thing in its way. I have lost so many N540's and diode's. Now I lost a SMPS, I have heard large filter caps to store energy, and i have heard to use a non polar cap and small resistor. I though solenoids are used in many factorys. I would like to know how to protect the system. I do not care how much it costs. The flipper on the other side of the pinball is just fine. Please show me a solution, I wonder if I channel energy into a hundred power power resistors would do the trick. Thank you for the perfect show. You are a great teacher. from Bill

[@erikdenhouter]

Don't know all of what you have, and I have limited experience with what you ask, but what I read is simple: use a diode with a voltage rating >at least< 10x the coil voltage, and a current rating of >at least< as large as what the coil gets. That 5000V is nothing, that will be without load (but it hurts for sure). The diode (if it survives) should keep that voltage always under 1V, that is its job. It will be best I think to solder it directly on the coil (but make sure it is not to heavy and wrecks your coil with these slamming solenoids ! ), and its maybe not a bad idea to solder one extra on your FET or Darlington. A 1000V 6Amp diode will cost no more than 20 cent, a FR607 is a fast one with these properties. I wonder why the other solenoid does not have this problem...

[@erikdenhouter]

I did forget to mention: check well if that circuit around the solenoid has solid connections that can't be disconnected by these slamming solenoids, because then the diode will also be disconnected for a sec, and then the 5000V will go and search for an alternative path.

[@alexkay1874]

SMPS are Black Magic I hate trying to fix these things