Transformer Design Pitfalls: Stepup Is Not As Easy As Stepdown

by Gregory Mirsky, Design Engineer, Deer Park, Ill., How2Power Today, Jul 15 2022

Focus:
When designing transformers, engineers often forget that they not only transform one voltage into another but also transform impedance. The apparent input impedance has a component that is the secondary impedance divided by the squared transformation coefficient. This causes certain problems with power transfer at high frequency by means of a stepup transformer. In particular, these problems relate to the impact of the turns ratio and other factors on the input circuit time constant. In this article, we will analyze the relationship between these parameters and demonstrate this relationship with a design example.

What you’ll learn:

• How to understand the impact of transformer turns ratio on the apparent input time constant of a stepup transformer and related effects

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