Microchip Digital Interleaved Power Factor Correction Reference Design

Microchip Technology introduced the Digital Interleaved Power Factor Correction (PFC) Reference Design. The Digital Interleaved PFC 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 reference design helps designers of green power-supply products lower costs, reduce size, and improve power efficiency via digital power conversion. All of the documentation, software, and Gerber files needed to build the reference design are available now for free.

Microchip Digital Interleaved Power Factor Correction Reference Design

Microchip Digital Interleaved PFC Reference Design Features

  • Operates at universal input voltage (85-265Vac, 45-65Hz)
  • Operates up to 350W sustained output
  • Output voltages up to 400Vdc
  • Power factor correction of 0.998 at full load and 120VAC input
  • Current Total Harmonic Distortion (ITHD) of 3% at full load and 120VAC input
  • Fault protection

Microchip’s Digital Interleaved PFC Reference Design works with a universal input voltage range and produces a single, high-voltage DC output of up to 350W. 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.

Digital Interleaved Power Factor Correction Reference Design Blocks

  • Input EMI filter and rectifier
  • Dual-phase interleaved PFC circuit with feedback
  • Plug-in module connector, populated with a dsPIC33FJ16GS504 DSC
  • User-interface circuit with programming connector and push buttons
  • 12V and 3.3V power-supply circuit
  • Fault-detection circuit for hardware protection

More information: Microchip Technology