High-Power-Density Single-Phase Three-Level Flying-Capacitor Buck PFC Rectifier

Active pulsating power buffering (PPB) is an effective technique to reduce the energy storage requirement of a single-phase power-factor-correction (PFC) rectifier. Existing single-phase solutions with active PPB, however, generally suffer from high voltage stresses, leading to increased power losse...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2019-11, Vol.34 (11), p.10833-10844
Main Authors: Qi, Wenlong, Li, Sinan, Yuan, Huawei, Tan, Siew-Chong, Hui, Shu-Yuen
Format: Article
Language:English
Subjects:
Active filters
Active power decoupling
automatic power decoupling
buck power-factor-correction (PFC) rectifier
Buffers
Capacitors
Clamps
Control methods
Converters
Electromagnetic interference
Electronic devices
Energy conversion efficiency
Energy storage
High voltages
Low voltage
Magnetic cores
Power efficiency
Power loss
Rectifiers
Reduction
Stress
Stresses
Switches
Switching
three-level flying capacitor
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Summary:Active pulsating power buffering (PPB) is an effective technique to reduce the energy storage requirement of a single-phase power-factor-correction (PFC) rectifier. Existing single-phase solutions with active PPB, however, generally suffer from high voltage stresses, leading to increased power losses as well as the need for high-voltage-rating semiconductor switches. Previous works have been focusing on two-level switching converter configurations, and thus have failed to address the high-voltage-stress problem. In this paper, a single-phase three-level flying-capacitor PFC rectifier with PPB-embedded switching is proposed. The flying capacitor not only clamps the voltage stresses of all power devices but also functions as a PPB capacitor. The operating principles, control methods, and design guidelines are detailed and the feasibility of the proposed converter is verified through a 48-W (48-V/1-A) hardware prototype. The proposed rectifier is shown to achieve nearly 50% reduction of the voltage stresses, 72% reduction of the buffering capacitor's volume, and 23.8% reduction of the magnetic core size, as compared to a state-of-the-art two-level solution recently proposed. This new approach of formulating single-phase PFC rectifiers with active PPB could dramatically boost the system's efficiency and power density whilst reducing cost.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2019.2896585