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  • Interleaved Power Factor Correction

  • Created: Sep 01, 2014

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The power factor is defined as the ratio between the real power and the apparent power in an AC circuit. There is a need to correct poor power factor to maximize power transfer. It is used in digital power supplies 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.

This circuit is useful to consumer electronics product. It is 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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