r/EEPowerElectronics

Hi everyone,

I've done my masters in Power Electronics but the coursework didn't contain anything remotely on EMI/EMC. Recently I interviewed at a firm and have been selected for the role of EMC engineer for power converter. The interview mostly focused on the electromagnetism, project and my research paper focusing on mitigation of ringing in wide bandgap devices which carried me through the interview.

Can you tell what should I focus on before joining so I don't feel the discomfort from the start. Currently, I brushed up my maxwell equation and also studying Henry Ott Electromagnetic Compatibility Engineering but the book feel too theoretical.

Any advices are welcome.

https://preview.redd.it/aka38epzpmah1.jpg?width=3508&format=pjpg&auto=webp&s=591495f39317740a0b1ac74c4c4964fae2ca6918

I am working on a interleaved boost converter using two LM5122 devices in a master/slave relation. The boost converter is designed to work at a maximum input of 30a, 5-40v input. The output is supposed to be 48v. If you need more information there is a bit more here: https://github.com/bearjhartjen/Lamoka1-project/blob/Lamoka1/HARDWARE/DESIGN_NOTES.md

Hi,

I was wondering how you guys select the values of the gate drive resistor in power application for mosfet or sic fets.

I'm not talking about the power rating but more about the speed that the switches will work. Because traditionally EMI was a big concern and a big reason to lower the switching speed and also the switching frequency.

But with sic and GAN this is now different in the sense you want to use the high speed of switching and in turn increase the switching frequency. I try to make a good as possible layout( low trace inductance) and measure the ringing in the drain source to check for the ringing. But I'm always concerned about the capacitive coupling sic fets and the heatsink that is going to radiate.

For that I use y caps with low esl etc to make that loop as short as possible to prevent radiating.

Can you guys share your opinion on this? How do you guys see this ? ( Like rule of thumb switching speed is 1/100 of switching frequency) ?

hey, im working at my 1 month internship and for my final week i have to simulate a CC/CV 5W charger with flyback topology. what is the best online website for this where i can simulate it without too much hassle since its already thursday. help a bro out.