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 NXP Semiconductors


  • Interleaved Power Factor Correction

  • Created: Aug 31, 2014

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Summary

Digital power supplies are used in a wide variety of applications ranging from telecommunication power supplies and base stations to air conditioners and other home appliances. All of these applications predominantly use a Power Factor Correction (PFC) stage to improve the input power factor, voltage regulation and Total Harmonic Distortion (THD) of the input current. Without such a PFC stage, the current drawn will have significant harmonic contents due to the discontinuous currents drawn over a short duration. This, in turn, will result in increased network losses, radiated emission, and total harmonic distortion. At higher power levels, these problems become more pronounced, thereby reducing overall efficiency of the system.


This application note focuses on the design of an Interleaved Power Factor Correction (IPFC) converter. It explains the digital implementation of the IPFC on a 16-bit fixed point dsPIC DSC, containing the theoretical aspects of functioning, and MATLAB modeling. This application note also provides hardware design guidelines and explains how to install and configure the IPFC reference board. The IPFC reference design is intended to aid the user in the rapid evaluation and development of PFC using the dsPIC DSC.


The low-cost and high-performance capabilities of the dsPIC DSC, combined with a wide variety of power electronic peripherals, such as an Analog-to-Digital Converter (ADC), Pulse-Width Modulator (PWM) and Analog Comparator, help to simplify the digital design and development of power-related applications.

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