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A Single-Stage Current-Mode Active Rectifier with Accurate Output-Current Regulation for IoT
Mao F.3; Lu Y.3; Lin J.3; Zhan C.4; Seng-Pan U.3; Martins R.P.3
2018-04-26
Conference NameIEEE International Symposium on Circuits and Systems (ISCAS)
Source PublicationProceedings - IEEE International Symposium on Circuits and Systems
Volume2018-May
Conference DateMAY 27-30, 2018
Conference PlaceFlorence, ITALY
Abstract

This paper presents a single-stage wireless charger using a current-mode active rectifier with accurate output current regulation for efficient wireless charging. As we know, the rectifier processes an AC input voltage/current and a pulsing output current which are difficult to be accurately sensed on chip with small area and power overheads. The proposed current sensing technique uses a replica sensing stage in parallel with the main power stage. It consists of two small cross-connected sensing PMOS transistors, a small filtering capacitor, and a dynamic replica load. In addition, by adaptively tuning the delay of the power NMOS driving signal, the charging current is regulated precisely. This single-stage wireless charger operates at 6.78MHz, and is designed in a 0.35μm CMOS process. Simulation results show a minimum 97.5% current regulation accuracy over a 10× (from 100mA to 1A) output-current range. The peak efficiency of 94% is achieved with 4.2W output power.

KeywordAc-dc Converter Current Sensing Current-mode Active Rectifier Wireless Charging Wireless Power Transfer (Wpt)
DOI10.1109/ISCAS.2018.8351692
URLView the original
Indexed BySCI
Language英语
WOS Research AreaEngineering
WOS SubjectEngineering, Electrical & Electronic
WOS IDWOS:000451218703140
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Citation statistics
Document TypeConference paper
CollectionINSTITUTE OF MICROELECTRONICS
Affiliation1.Synopsys Macau Ltd.
2.Instituto Superior Técnico
3.Universidade de Macau
4.Southern University of Science and Technology
Recommended Citation
GB/T 7714
Mao F.,Lu Y.,Lin J.,et al. A Single-Stage Current-Mode Active Rectifier with Accurate Output-Current Regulation for IoT[C],2018.
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