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Adaptive On/Off Delay-Compensated Active Rectifiers for Wireless Power Transfer Systems
Cheng L.1; Ki W.-H.1; Lu Y.2; Yim T.-S.1
2016-03-01
Source PublicationIEEE Journal of Solid-State Circuits
ISSN00189200
Volume51Issue:3Pages:712-723
Abstract

An adaptive on/off delay-compensation technique is proposed to improve the performance of CMOS active rectifiers for wireless power transfer (WPT) systems. The effects of the on/off delays on the performance of the active rectifiers with either a parallel-resonant or a series-resonant circuit at the secondary coil are studied, which include power conversion efficiency (PCE), voltage conversion ratio (VCR) and output voltage ripple. By adding two feedback loops to the active diodes to generate the switched-offset currents for the comparators adaptively, both on- and off-delays are compensated for accurately against PVT variations and mismatches. As a design example, a fully integrated active rectifier for biomedical applications with a parallel-resonant secondary was fabricated in a standard 0.35 μm CMOS process. With an AC input that ranges from 1.8 to 3.6 V, the measured VCR is higher than 90% and the measured PCE is higher than 89.1% for a load resistor of 500 Ω. In particular, the PCE is increased by 9% compared to the active rectifier without using the proposed technique.

KeywordActive Rectifier Comparator Delay Delay Compensation Inductive Coupling Pvt Variations Resonant Wireless Power Transfer (R-wpt) Reverse Current Control
DOI10.1109/JSSC.2016.2517119
URLView the original
Indexed BySCI
Language英语
WOS Research AreaEngineering
WOS SubjectEngineering, Electrical & Electronic
WOS IDWOS:000372550500013
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Citation statistics
Cited Times [WOS]:36   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionINSTITUTE OF MICROELECTRONICS
Corresponding AuthorCheng L.; Ki W.-H.; Yim T.-S.
Affiliation1.Hong Kong University of Science and Technology
2.Universidade de Macau
Recommended Citation
GB/T 7714
Cheng L.,Ki W.-H.,Lu Y.,et al. Adaptive On/Off Delay-Compensated Active Rectifiers for Wireless Power Transfer Systems[J]. IEEE Journal of Solid-State Circuits,2016,51(3):712-723.
APA Cheng L.,Ki W.-H.,Lu Y.,&Yim T.-S..(2016).Adaptive On/Off Delay-Compensated Active Rectifiers for Wireless Power Transfer Systems.IEEE Journal of Solid-State Circuits,51(3),712-723.
MLA Cheng L.,et al."Adaptive On/Off Delay-Compensated Active Rectifiers for Wireless Power Transfer Systems".IEEE Journal of Solid-State Circuits 51.3(2016):712-723.
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