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

Wenlong Qi, Sinan Li, Huawei Yuan, Siew Chong Tan, S.Y.Ron Hui

Research output: Contribution to journalArticle

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Abstract

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.
Original languageEnglish
Pages (from-to)1-1
Number of pages1
JournalIEEE Transactions on Power Electronics
Early online date31 Jan 2019
DOIs
Publication statusE-pub ahead of print - 31 Jan 2019

Cite this

High-Power-Density Single-Phase Three-Level Flying-Capacitor Buck PFC Rectifier. / Qi, Wenlong; Li, Sinan; Yuan, Huawei; Tan, Siew Chong; Hui, S.Y.Ron.

In: IEEE Transactions on Power Electronics, 31.01.2019, p. 1-1.

Research output: Contribution to journalArticle

Qi, Wenlong ; Li, Sinan ; Yuan, Huawei ; Tan, Siew Chong ; Hui, S.Y.Ron. / High-Power-Density Single-Phase Three-Level Flying-Capacitor Buck PFC Rectifier. In: IEEE Transactions on Power Electronics. 2019 ; pp. 1-1.
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