Determining Design Power Over An Input Voltage Range (Part 3): Maximum Transformer Power

by Dennis Feucht, Innovatia Laboratories, Cayo, Belize, How2Power Today, Mar 15 2021

Focus:
Magnetic components operated as transformers, like inductors, have maximum power ratings. But as was the case with inductors, the maximum power handled by the transformer is not optimal for sizing the transformer. Here in part 3 (the last part), the same analysis which the author applied to inductors in parts 1 and 2 is extended to transformers. Once again, this article derives expressions for design power ratios for each PWM-switch configuration. The main differences in the analysis for transformers versus inductors relate to the differences in the waveforms seen by transformers vs. those seen by inductors. This applies both to the shape of the waveforms and the influence of the transformer turns ratio. The author concludes by discussing how the derived formulas explain some tradeoffs in converter design that result from specifying a wide input voltage range.

What you’ll learn:

• How to determine the design power ratio for a transformer in each of the three PWM-based converter configurations

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