High-Power Density PFC Converter Design with SiC-based Power Module
Author
Vasudev, Arun Puthussery
Term
4. term
Education
Publication year
2023
Submitted on
2023-11-03
Pages
95
Abstract
Elbiler bliver hurtigt mere udbredte, og det skaber behov for ladere, der er kompakte, effektive og skånsomme mod elnettet. Effektfaktorkorrektion (PFC) hjælper ved at få strømmen til at følge netspændingen, så man opnår høj effektfaktor og lav harmonisk forvrængning. Det betyder mindre spild og mindre elektrisk støj fra laderen. Dette projekt undersøger udformning og optimering af en interleavet PFC‑konverter baseret på et siliciumkarbid (SiC) MOSFET‑modul med tre integrerede boost‑grene. Interleaving lader flere ens krafttrin arbejde forskudt i fase for at reducere rippel, og fasefrakobling kan slå nogle grene fra ved lav belastning for at bevare høj virkningsgrad over et bredt effektområde. Derimod er det kun sparsomt undersøgt, hvordan boost‑induktoren og EMI‑filteret bør dimensioneres og optimeres under sådanne driftsmåder, når man samtidig vil øge effekttætheden (mere effekt pr. volumen). Derfor kortlægger arbejdet forhold, der påvirker ydeevnen af en enkeltfase, tre‑trins interleavet PFC‑konverter med det formål at maksimere effekttæthed.
Electric vehicles are spreading quickly, creating a need for chargers that are compact, efficient, and grid‑friendly. Power factor correction (PFC) helps by drawing current in step with the mains voltage, achieving a high power factor and low harmonic distortion, which reduces waste and electrical noise. This project examines the design and optimization of an interleaved PFC converter built with a silicon carbide (SiC) MOSFET module that integrates three boost legs. Interleaving runs several identical power stages out of phase to reduce ripple, and phase‑shedding turns some stages off at lower power to keep efficiency high across a wide load range. However, how to size and optimize the boost inductor and the electromagnetic interference (EMI) filter under these operating modes, while increasing power density (more power per unit volume), has not been well explored. The study therefore investigates factors that affect the performance of a single‑phase, three‑stage interleaved PFC converter with the aim of maximizing power density.
[This summary has been rewritten with the help of AI based on the project's original abstract]
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