Microchip has developed the digital interleaved power factor correction (PFC) reference design, which demonstrates how to realise the benefits of fully digital PFC for green power supply designs. Specifically, this free reference design provides an easy method to evaluate the power efficiency and features of Microchip’s dsPIC33 'GS' series of digital signal controllers (DSCs) for switch mode power supplies (SMPSs) in an interleaved PFC application.
The trend toward digital power conversion is enabling green power-supply designs, along with smarter and more efficient power systems. This trend helps to lower the carbon footprint of power systems and ease the burden on the world’s strained power grids. High-performance power supplies are used in a wide variety of applications, including telecommunications and industrial equipment, digital televisions, lighting, airconditioners and other home appliances. Digital interleaved PFC improves the power supply’s overall efficiency, along with the input power factor, voltage regulation and the total harmonic distortion (THD) of the input current.
According to Microchip, digital interleaved PFC methods provide many advantages over older PFC techniques, including:
* Lower cost for high-power applications.
* Smaller PFC inductor and magnetic volume.
* Higher power density.
* Lower ripple.
* Easy implementation of sophisticated control algorithms.
* Flexible software modifications to meet specific customer needs.
* Simpler integration with other applications.
Microchip’s reference design works with a universal input voltage range and produces a single, high-voltage DC output of up to 350 W. Its dual-phase interleaved PFC software implements three compensators for voltage, current and load balancing. It also has a feed-forward compensator, based on the average input voltage.
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