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A 99.1%, 490-W/in^3, Front-End-Based Power Factor Correction for a 7-Level Flying Capacitor Multilevel Converter

Event Type
Grainger CEME
4070 ECEB
Feb 26, 2018   1:00 - 1:50 pm  
Zitao Liao





We present a front-end-based power factor correction (PFC) mechanism for a GaN-Based 7-level flying capacitor multilevel (FCML) boost converter. The proposed converter characteristics include the use of low-voltage-rated transistors, reduced voltage stress and high effective switching frequency on the filter inductor. Such features lead to a drastic reduction in the filter inductor size, with the high efficiency kept unchanged, and thus significantly increase the power density of the PFC frond end compared to conventional solutions. However, the small inductance presents a challenge for the PFC control. We analyzed the dynamics of the 7-level FCML converter and implemented feedforward control to overcome the challenge. The hardware prototype is designed for universal AC input from 90 V – 265 V (AC) and a 400 V DC output at 1.5 kW power rating. The hardware prototype demonstrates improved efficiency and power density as well as power factor and THD performance, when compared to existing implementations. We experimentally verified a peak efficiency of 99.07% and a power density of 490 W/in3.

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