NDLI: A Design of a Wireless Power Receiving Unit With a High-Efficiency 6.78-MHz Active Rectifier Using Shared DLLs for Magnetic-Resonant A4 WP Applications

Content Provider	IEEE Xplore Digital Library
Author	Hyung-Gu Park Jae-Hyeong Jang Hong-Jin Kim Young-Jun Park SeongJin Oh YoungGun Pu Keum Cheol Hwang Youngoo Yang Kang-Yoon Lee
Copyright Year	1986
Abstract	This paper presents a full-CMOS wireless power receiving unit (WPRU) with a high-efficiency 6.78-MHz active rectifier and a dc-dc converter for magnetic-resonant alliance for wireless power (A4WP) applications. The proposed high-efficiency active rectifier with delay-locked loop (DLL) is a highly efficient receiver circuit intended for use in resonant wireless charging applications with a resonant frequency of 6.78 MHz. Each MOSFET of the proposed rectifier is turned on and off based on the ac input voltage. The delay between the ac input current and the ac input voltage due to the delays of internal blocks such as voltage limiter, level shifter, gate driver, and comparator will cause the reverse leakage current, degrading the power efficiency. Thus, the proposed active rectifier adopts the DLL to compensate for the delay caused by internal blocks, which leads to the removal of reverse leakage current and the power efficiency maximization. Moreover, to maximize power efficiency, negative impedance circuit (NIC) is also adopted to minimize switching loss. In the case of dc-dc converter, phase-locked loop is adopted for the constant switching frequency in process, voltage, and temperature (PVT) variation to solve the efficiency reduction problem, especially by heat. This chip is implemented using 0.18 μm BCD technology with an active area of 3.5 mm × 3.5 mm. When the magnitude of the ac input voltage is 8.95 V, the maximum efficiencies of the proposed active rectifier and dc-dc converter are 91.5% and 92.7%, respectively. The range of ac input voltage is 3-20 V, and the efficiency of the WPRU is about 80.86%.
Sponsorship	IEEE Power Electronics Society
Starting Page	4484
Ending Page	4498
Page Count	15
File Size	3276125
File Format	PDF
ISSN	08858993
Volume Number	31
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2016-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Rectifiers Wireless communication Receivers MOSFET DC-DC power converters Delays Magnetic resonance A4WP Wireless Power Receiving Unit high efficiency 6.78MHz Active Rectifier DLL Magnetic Resonant wireless power receiving unit (WPRU) 6.78 MHz A4 WP active rectifier delay-locked loop (DLL) magnetic resonant
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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