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Interleaved power factor correction (IPFC) using the dsPIC DSC

Posted: 09 Sep 2009     Print Version  Bookmark and Share

Keywords:power factor correction  PFC interleaved  digital signal controller 

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.

The standard boost converter topology is the preferred method for implementing the digital PFC. It operates the converter in continuous conduction mode (CCM), thereby significantly reducing input current harmonics.

The application note describes the digital implementation of a single-stage PFC using a dsPIC digital signal controller (DSC). This application note focuses on the design of an interleaved PFC (IPFC) converter. It explains the digital implementation of the IPFC on a 16bit fixed point dsPIC DSC, containing the theoretical aspects of functioning and MATLAB modelling. 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 ADC, PWM and analogue comparator, help to simplify the digital design and development of power-related applications. Some advantages of using a digital implementation for IPFC are the following:

• Easy implementation of sophisticated control algorithms;
• Flexible software modifications to meet specific customer needs;
• Simpler integration with other applications.

The controller and hardware design guidelines and techniques described here can be used to create well-formed maintainable applications. The software developed for the IPFC design is highly flexible, so it can be customised and configured to meet the needs of the specific application.

View the PDF document for more information.

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