Core Geometry Coefficient For Resonant Inductors

Focus:

A resonant inductor is required to have a small size, a low power loss, and good heat dissipation. But it is difficult to design an optimal inductor for high-frequency and high-power applications. Until now, the methods for designing resonant inductors relied on a trial-and-error approach. And there was no clear method for selecting the optimum core from the various models available from different core suppliers. In this articles, the authors explain, how the core geometry coefficient (Kg) can be used to select the core. By using the Kg method, it is possible to select the core satisfying the acceptable wire loss, the electromagnetic conditions, and a core area restriction. This paper presents expressions of the core geometry coefficient for resonant inductor designs and then demonstrates the use of the Kg method in designing the resonant inductor for a class-E resonant power amplifier. By using the proposed expressions, the core geometry coefficient is determined from the electrical specifications of the loaded quality factor of a series-resonant circuit, the output power, the operating frequency, the maximum flux density, and the maximum wire loss. Besides being used to design inductors for resonant power converters, the Kg method may also be used to design inductors for hard switching PWM) dc-dc converters.

What you’ll learn:

• How to design inductors for resonant power converters
• How to select the optimal core for a resonant inductor using the core geometry coefficient

Notes:

*This paper was originally presented at the 2010 Electrical Manufacturing & Coil Winding Expo, held October 18-20, 2010 in Dallas, Texas.

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Author & Publication:

Hiroo Sekiya, Chiba University, Chiba, Japan and Marian K. Kazimierzuk, Wright State University, Dayton, OH, How2Power Today, Nov 30 2011

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