Digital Controller Eases Design Of Interleaved PFC For Multi-kilowatt Converters
by Rosario Attanasio, Giuseppe Di Caro, Sebastiano Messina, and Marco Torrisi, STMicroelectronics, Schaumburg, Ill. and Catania, Italy, How2Power Today, Jun 15 2017
Focus:
In power supply applications requiring higher power up to and beyond a kilowatt, the
design of power factor correction (PFC) boost converters using interleaved stages
rather than a single stage becomes advantageous. However, controller IC options
available to date have required specialized design and programming skills to implement
PFC at the kilowatt level, while also imposing bandwidth limitations associated with
digital control of the compensation loop. To overcome these difficulties, a new
digital controller (the STNRGPF01) has been developed that is suitable for multi-
channel interleaved PFC topologies operating in CCM. The operation and application of
this IC are described in detail in this 24-page article. Experimental results for a 3-
kW three-channel interleaved PFC prototype show the suitability of the proposed
approach and the benefits of combining digital and analog control techniques.
What you’ll learn:
- How to understand the challenges of implementing interleaved PFC boost converters
- How to implement a 3-kW three-channel interleaved PFC boost converter using the STNRGPF01 controller
- How to design an interleaved PFC boost converter using digital control
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