#24 🚀 The error a lot engineers are doing with the concept ZVS

👋 Hello! Dr. Molina here! 👨‍🔧

Thank you for reading and welcome to the jungle my Newsletter about my journey at Frenetic and my favorite topic, High-Frequency Magnetics 🚀

 On a regular week, I can talk with more than 8 different engineers from different companies around the globe. I don´t know why this mistake is very common.

“I need to design a ZVS transformer”

This is a mistake.

This is a wrong concept. The concept of ZVS is related to the switches.

The switch achieves ZVS because the energy stored in his parasitic capacitance is discharged before is turned ON and there are no commutation losses. In the picture, you can see an example.

There are several factors that affect achieving ZVS.

For example, in a Full-Bridge Phase Shift converters, the ZVS of the primary switches depends on:

•   the Dead Time between switches in the same leg,

•   the parasitic capacitance of the switch (+ the transformer),

•   and the series inductance of the transformer (Leakage or external inductance)

Therefore, of course, the transformer is part of the operation, but there are no ZVS transformers.

The ZVS is critical for decreasing the EMI noise and increasing the efficiency but to be honest, my main reason for having ZVS is:

To keep MOSFETs safe!!🦸🏻‍♂️

When you have hard switching, the possibility of breaking the switches is much higher than having ZVS.

If you were in my shoes, What do you think I should answer to them? 🧐

By the way, today we are offering Training where you can use our online simulator for one month, you can calculate very accurate the Leakage inductance of your transformer and avoid 80% of the hardware iterations. Besides, receive great lessons on magnetic design and the possibility of technical consultancy during the whole month.

Here is the link:

❌ If you like to lose your time, Frenetic is not appropriate for you.

✅ If you want to be in the best community of Magnetic designers, You are Frenetic.

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Sincerely,

Chema 👋