Digital Controller Eases Design Of Interleaved PFC For Multi-kilowatt Converters

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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Author & Publication:

Rosario Attanasio, Giuseppe Di Caro, Sebastiano Messina, and Marco Torrisi, STMicroelectronics, Schaumburg, Ill. and Catania, Italy, How2Power Today, Jun 15 2017

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