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Megahertz-Range Wireless-Power-Transfer Rectifiers Resonant To Regulate

Jan. 10, 2014
The goal of efficient and compact wireless energy transfer is driving innovations with resonant circuits so that more applications can ditch the wire.
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As more products are designed with wireless charging capability, resonant wireless-power-transfer (WPT) technology is increasingly present in the wireless market. Having faster and more reliable charge rates—while using less expensive or space-consuming electronics—is a major goal for this industry. At the Korea Advanced Institute of Science and Technology, Jun-Han Choi, Sung-Ku Yeo, Seho Park, Jeong-Seok Lee, and Gyu-Hyeong Cho designed and tested several resonant regulating rectifiers for enhanced WPT capability at 6.78 MHz.

On 0.35-micrometer bipolar-CMOS-DMOS (BCD) technology, the team is able to design RWPT circuits that can harvest power to 6 W at 86% efficiency using both the continuous conduction mode (CCM) and discontinuous conduction mode (DCM). The proposed resonant-regulating-rectifier designs do not require an additional inductor for switch-mode regulation, as the resonant tanks are operated using phaser-transformed inductance. Only three switches are used in a rectifier design that achieves 6 W of transferable power. Such a feat is impressive when compared to other resonant-regulating-rectifier systems that have been reported, which have less than 1 W of available power at 13.56 MHz. See “Resonant Regulating Rectifiers (3R) Operating for 6.78 MHz Resonant Wireless Power Transfer (RWPT),” IEEE Journal of Solid-State Circuits, Dec. 2013, p. 2989.

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About the Author

Jean-Jacques DeLisle

Jean-Jacques graduated from the Rochester Institute of Technology, where he completed his Master of Science in Electrical Engineering. In his studies, Jean-Jacques focused on Control Systems Design, Mixed-Signal IC Design, and RF Design. His research focus was in smart-sensor platform design for RF connector applications for the telecommunications industry. During his research, Jean-Jacques developed a passion for the field of RF/microwaves and expanded his knowledge by doing R&D for the telecommunications industry.

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