Deciphering the gate charge-curve of power MOSFETs

Please note: The pointer in video is displaced

[aiswaryaremesh]

I really like your videos ... It's very very resourceful for upcoming power electronic engineers.. Thanks a lot from India

[kiq]

I have been working with mosfets for years and I still learn things from you !

[catalin]

First video on the whole YouTube that talks about this detailed aspects of MOSFETs. Keep it up Sam !!

[joejane]

will watch again as i learned so much i need to think again.
thank you for detailed explanations on this topic.

[BillySugger]

Very interesting and very useful. Many thanks!

[aliutkusackran]

thank you Professor. It was interesting & helpful.

[sandeepvnair]

Thanks for the great video. Your videos are always a great help for students and professionals alike.
However, I would like to point out a mistake in this video. At 40:57, it is said that the nonlinear effect of the capacitor would reduce the switching losses. Here, you compare two cases, one with a "constant low capacitance" and the other with "high capacitance at low Vds and low capacitance at high Vds (nonlinear C)". The increase in C will always have a higher charge requirement for increasing its terminal voltage, resulting in increased losses. I think the "red line" representing constant C should start decreasing when Vgs hits platue region, consequently dropping Vds to zero by nearly 10nC. Whereas, in the case of nonlinear capacitor, the drop in Vds would extend beyond 10nC due to the increased capacitance as you have shown. Thus, the nonlinear effect of the capacitor (increased C in lower Vds) should cause an increase in switching losses.

[aptx]

This was very helpful lecture to under stand power mosfet.thank you so much!

[markoula]

Hi, thank you for the great tutorial. I have a question regarding current through channel at the end of Miller flat region. If the Vgs is increasing why does the current stays constant? I believe it should increase because increase in Vgs should allow more current to flow through the channel?

[subhabratabasak]

The lecture was very helpful. Thanks a lot.

[jamalhw]

Thanks for your hard work. Another fantastic lecture. I am very grateful as I have learnt a lot from you!

[evangelosliakos]

Awesome video! Mr. Yaakov you answered so many questions of mine! Thanks!

[pablomarco]

Dear Professor, if you have some freetime, could you please make this lecture again? Since the cursor is shifted, one of the most important concepts of the Power Elecronics get quite hard to understand. Since your videos are quite intuitive, I almost only follow your videos. I hope my intention was clear :) In anycase, may the God bless you.

[tseckwr]

Thanks for your hard work doing these videos.

[alexandermuller]

I really like this simple explanation regarding the CGD capacitance. Comparing on and off State and calculating the delta Q for the input capacitors. What really confuses me is the term miller effect and miller plateau which are used in this context across the literature. From my understanding miller effect is something related to small signal calculation (gain). It has a huge impact on my bandwidth for example in my transfer function. Interestingly this simple calculation with the total charge reveals the same miller factor, that CGD is increases by low frequency small signal gain.

Is it possible to explain the miller plateau by looking at the related time constants? CGD is larger then CGS (because of Miller, additionally the FET is in saturation region since VDS>VGS-VTH), so the time constant associated with CGD should be larger. That means that when i reach the plateau the slope of charging CGD will be higher then CGS, because CGS has been already charged RELATIVLY higher.

[cwhungc]

very detailed and comprehensive. thanks a lot.

[topphemlig]

Fantastic. Thank you very much for sharing this, I found it helpful to a simulation problem I've been having just this week. Keep it up!

[ujjwalkarki]

Your lectures provide a very good learning experience.

[pratosh]

I guess the cursor in this tutorial being pointed to at, is offset by few scales depending on full screen or not :) !! But thank you very much for making this video. This was extremely informative and useful.

[zloomi]

Hi, great video with great explanation. did you happen to make an updated one with fixed cursor? 😊