Optimising PFC Boost Converter Design

Focus:

To build power-factor-corrected power supplies with ratings of 2 kW or higher for space-constrained applications, high-frequency switching becomes a requirement for the power factor correction (PFC) stage. Two topology options for the PFC stage are a single-phase (or single stage or single channel) boost topology or a multiphase, interleaved boost topology. The latter approach may have benefits in terms of reducing the size of magnetic components, EMI filter requirements, ripple current, and power dissipation. However, because of a non-constant duty cycle, these benefits cannot be assumed and will depend on application-specific operating conditions. A Mathcad simulation system presented here enables designers to compare the performance of single-phase boost PFC and dual-phase, interleaved boost PFC stages. Mathcad models are described for a 2000-W PFC converter and its performance is simulated under different operating conditions.

What you’ll learn:

• How to determine the actual benefit of dual-phase, interleaved PFC boost converters versus single-phase interleaved PFC boost converters
• How to calculate power dissipation of semiconductors, magnetics, and output capacitors in single and dual phase PFC boost converters
• How to calculate inductor size requirements for single- and dual-phase PFC boost converters

Notes:

Article appears on pages 26-28 of February issue in article archive. You must register to access articles in this magazine's archive.

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Author & Publication:

http://www.bodospower.com/, Bodo's Power Systems, Feb 01 2009

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