Journal
2020 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)
Volume -, Issue -, Pages 2555-2562Publisher
IEEE
Keywords
GaN; CRM; totem-pole PFC; ZVS; WPT; fast dynamic response; noise immunity
Funding
- Office of Energy and Renewable Energy (EERE), U.S. Department of Energy [DE-EE0006521-012]
- Engineering Research Center Program of the National Science Foundation
- DOE under NSF [EEC-1041877]
- CURENT Industry Partnership Program
- Power America
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The soft-switching gallium-nitride (GaN) based critical conduction mode (CRM) totem-pole power factor correction (PFC) converter is a good candidate for the front-end rectifier in wireless power transfer (WPT) applications. In multi-receiver MHz WPT systems, the PFC converter is required to have fast dynamic response and noise immunity. In this work, a GaN-based CRM totem-pole PFC converter is designed for a multi-receiver wireless charging power supply. Digital-based variable on-time control is used to achieve the zero voltage switching (ZVS) within the whole line cycle, and a voltage-loop controller with notch filters is designed to improve the transient response. The impact of high-frequency noise on the sensing signals and ZVS control are analyzed, and implementation methods are proposed to mitigate the disturbances. A GaN-based CRM totem-pole PFC that is demonstrated with 98.5% full-load efficiency is built as the first stage in the transmitter of a 100 W 6.78 MHz multi-receiver WPT system. The noise immunity of the CRM PFC is verified by testing the whole WPT system. Experimental results show that the system end-to-end efficiency at full load is 90.16%, and fast dynamic response is achieved during load variation.
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