Leakage Inductance (Part 3): Improving Power Supply Filtering, Efficiency And Density

Focus:

This final installment of the series describes some of the ways that leakage inductance is a friend, offering benefits in filter and power converter circuits. In EMI filters, leakage inductance can enhance the filter’s attenuation of both differential- and common-mode noise. And in multi-output forward converters and other topologies, leakage inductance in coupled inductors can provide filtering of output ripple. Leakage inductance also aids zero voltage switching (ZVS) in the active-clamp flyback converter, enabling lower switching losses and/or use of higher switching frequencies. Similar benefits are obtained in the active-clamp coupled-boost converter.

What you’ll learn:

• How to understand the benefits of leakage inductance in power supply circuits, particularly in active-clamp flyback and boost converters
• How to understand the benefits of leakage inductance in EMI filters
• How to understand the benefits of leakage inductance in coupled output chokes in multi-output converters

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Author & Publication:

Ernie Wittenbreder, Technical Witts, Flagstaff, Ariz., How2Power Today, Dec 17 2015

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