Improving the Efficiency of PFC Stages Using Interleaved BCM
by Jon Harper, Market Development Manager, Power Conversion & Industrial Systems, Fairchild Semiconductor Europe, Power Electronics Europe, Apr 27 2009
Focus:
At input power levels of 300 W up to 1000 W or higher, interleaved boundary conduction mode (BCM) power factor correction (PFC) can now be applied in place of non-interleaved continuous conduction mode (CCM) PFC. That option of applying dual-phase, interleaved BCM PFC is thanks to new PFC controllers such as the FAN9612, which overcome synchronization issues that previously made it difficult to interleave two boost PFC stages. Benefits of the interleaved BCM approach versus the noninterleaved CCM approach include reduced inductor size, lower switching losses, and less challenging EMI issues. In addition to discussing these benefits, the article describes operation of the FAN9612.
What you’ll learn:
- How to improve PFC boost converter performance at 300 W to 100 W using interleaved, BCM PFC
- How to reduce switching losses, inductor size, and EMI using interleaved BCM PFC boost converters
Notes:
Article is found on pages 35-39 of May/June 2009 issue. For more on the value of multiphase design in PFC boost converters at higher power levels, see "Optimising PFC Boost Converter Design" in Feb 1, 2009 issue of Bodo's Power Systems.
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