An Auxiliary Circuit with a Flexible LC Resonant Tank for High-Efficiency and Low-Cost Totem-pole Boost Bridgeless Power-Factor Correction Converter
Document Type
Conference Proceeding
Date of Original Version
1-1-2023
Abstract
This paper proposes an auxiliary circuit with a flexible LC resonant tank for a high-efficiency totem-pole bridgeless power factor correction (PFC) converter. The proposed auxiliary circuit enables a zero-voltage-switching operation of the totempole bridgeless PFC converter. To minimize power loss of the auxiliary circuit, the proposed auxiliary circuit controls a slope of an auxiliary inductor current by adjusting an auxiliary capacitor voltage level. When the main inductor current iLB is over a designed level, the auxiliary capacitor voltage is controlled to be almost zero. The proposed circuit operates to reduce the conduction loss in the auxiliary circuit with a steep slope of the auxiliary inductor current iLAUX. When iLB is under the designed level, the proposed circuit increases the capacitor voltage level to reduce the slope of iLAUX, resulting in relieving reverse recovery issues. A simple MOSFET control selects the operational mode of auxiliary circuits without any structural change. Moreover, design guidelines for a boundary condition of two operating modes and LC tank are presented based on the root-mean-square (RMS) current comparison, which optimizes efficiency. Finally, the effectiveness of the proposed converter is verified through experimental results with a 500 W prototype.
Publication Title, e.g., Journal
Conference Proceedings IEEE Applied Power Electronics Conference and Exposition APEC
Volume
2023-March
Citation/Publisher Attribution
Thurber, Shaun, Xueshen Zhang, Yeonho Jeong, and Jaeil Baek. "An Auxiliary Circuit with a Flexible LC Resonant Tank for High-Efficiency and Low-Cost Totem-pole Boost Bridgeless Power-Factor Correction Converter." Conference Proceedings IEEE Applied Power Electronics Conference and Exposition APEC 2023-March, (2023). doi: 10.1109/APEC43580.2023.10131358.