Valley Switching Boost Power Factor Correction (PFC) Reference Design


June 20, 2019

As the EV charging market boosts rapidly, increasing charging efficiency becomes a hot topic. Valley switching is a soft-switching technique that improves the system efficiency especially under light load when the efficiency and Total Harmonic Distortion (THD) are more difficult to improve. This technique can be applied to AC-DC and DC-DC converters.

In this video, a digital control valley switching technique is illustrated to significantly improve boost PFC converter performance especially the efficiency and THD under light load condition. This is achieved using the integrated digital control feature of the C2000 MCU F280049 without using complex external logic and sensing circuit.

An independent math processor CLA is used to alleviate the C28x CPU burden. In the next video in this series, you will learn how to enable the CLA for digital power solutions to offer a better integration option for EV/HEV applications when combining DC-DC and DC-AC.

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