Interleaving Brings PFC to New Heights
by Bob Neidorff and Thomas Lewis, Texas Instruments, PowerGuru, Mar 01 2008
Focus:
Apparently one of the early application articles on use of power factor correction (PFC)
controllers that support interleaving, this piece explains the reasons for and benefits of
interleaving PFC stages—ease of design, component size reduction and ripple reduction; explains
tradeoffs of transition mode (TM) versus continuous conduction mode (CCM) forms of operation;
and presents two-phase interleaved design examples based on TI’s PFC controllers. It starts by
reviewing how a typical PFC boost converter works. An interleaved CCM PFC boost converter based
on the UCC28070 controller IC and a TM version based on the UCC28060 are presented with
discussion on phase shedding, efficiency and handling of acoustic noise.
What you’ll learn:
- How to understand the operation and benefits of interleaving in PFC circuits
- How to understand the tradeoffs of transition mode versus continuous conduction mode in interleaved PFC boost converters
- How to design interleaved PFC boost converters using the UCC28070 and UCC28060 controller ICs
Notes:
Originally published in Bodo's Power Systems, the article is republished here on PowerGuru.
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