Power Electronics - Switching Losses in a MOSFET
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- เผยแพร่เมื่อ 29 มิ.ย. 2024
- This video details the average switching loss of a MOSFET used for switching inductive loads such as a DC-DC converter.
Additional resources on this topic can be found at the following:
"Power MOSFET Basics: Understanding Gate Charge and Using it to Assess Switching Performance,"
Application Note, AN-608A, Vishay
www.vishay.com/docs/73217/an6...
"MOSFET power losses and how they
affect power-supply efficiency" by By George Lakkas
Product Marketing Manager, Power Management TI
www.ti.com/lit/an/slyt664/slyt...
"IXYS Power MOSFET Datasheet Parameters Definition," by Abdus Sattar, IXYS Corporation IXAN0065
www.ixys.com/Documents/AppNot...
"Understanding MOSFET datasheets," TI Training Video Series
training.ti.com/node/1138902?...
"Power MOSFET Basics: Understanding the Turn-On Process," Application Note, AN-850, Vishay
www.vishay.com/docs/68214/tur...
This is by far the simplest and most comprehensive explanation of the timing of mosfets. It answered all the questions I've had about the power losses and I can't thank you enough!
You're welcome! -Dr. K
Thank you Sir, great videos. Would be quite helpful for your viewers if you could organize your videos in playlists.
Отличный урок! Спасибо вам большое!!
in the formula some words I can't understand. Would you show clear text?
Thanks for preparing the video. Could you please prepare a video on how to calculate the switching loss by the aid of simulation tools such as cadence or spice? Thanks
Hello, if you go to th-cam.com/video/ms6TiEZIJXk/w-d-xo.html and at about the 11:00 minute mark I will illustrate how to check the instantaneous power in the simulated DC chopper circuit's MOSFET. You can also window the switching waveform and LT Spice will compute the average loss. Hope this helps. -Dr. K.
do extra heat on mosfet can be a cause of permanent /change in #threshold voltage/ ......that's can ruin the mosfet in long run....
please reply
Thank you for this interesting video. Please can you share with me the proofs for the turn-on and turn-off times displayed in this video?
Hi Musong, those are estimates taken from www.vishay.com/docs/73217/an608a.pdf reference equations 17-20 in this document. Thanks for watching. -Dr K.
Hi Dr. K, I'm building a model of a bidirectional DC-DC converter in simulink and logging efficiency against switching frequency. I am expecting a peak followed by a downturn within the graph where switching losses dominate. But no matter how high the switching frequency is the efficiency keeps increasing which I think is wrong. Any ideas on how to resolve this?
Hi Camrone, unfortunately I have never used Simulink for analysis of DC/DC converters. My suggestion is to look at all the losses in all the devices to see which device is not being modelled correctly as you sweep the operating frequency point. Keep me posted. -Dr. K
@@powerelectronicswithdr.k1017 Hi Dr. K, think I have fixed the problem, I don't think switching losses are considered in Simulink so i have modelled them manually, I do have another question though, I've been looking at mosfet datasheets and have noticed there is a turn on delay time and a turn on rise time, (same for turn off) when calculating switching losses do i need to consider both of these times or just rise time? i.e. is t-on = t-d(on) + t-rise or t-on = t-rise ? Thanks in advance
@@cammasters2053 Hi Camrone, here's a link to info from TI on the MOSFET datasheets. training.ti.com/mosfet101training.ti.com/mosfet101. This is a really good series and Video 1.4 discusses the Ton, Trise, Td, etc. The vendors follow JEDEC standards for testing and reporting information. Hope this helps. -Dr. K