A Single-Stage Current-Mode Active Rectifier with Accurate Output-Current Regulation for IoT

Mao, Fangyu1; Lu, Yan1; Lin, Jie1,2; Zhan, Chenchang2; Seng-Pan, U.1,3; Martins, Rui P.1,4

10.1109/ISCAS.2018.8351692

2018

0271-4310

978-1-5386-4882-7

2018 IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS (ISCAS)

2018-May

1-4

27-30 May 2018

Florence, Italy

345 E 47TH ST, NEW YORK, NY 10017 USA

IEEE

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 0.35 mu m CMOS process. Simulation results show a minimum 97.5% current regulation accuracy over a 10(x) (from 100mA to 1A) output-current range. The peak efficiency of 94% is achieved with 4.2W output power.

AC-DC converter current-mode active rectifier current sensing wireless charging wireless power transfer (WPT)

其他

英语

CPCI-S ; EI

National Natural Science Foundation of China[FDCT-NSFC 006/2016/AFJ]

Engineering

Engineering, Electrical & Electronic

WOS:000451218703140

20184806146496

Electric current regulators ; Energy transfer ; Inductive power transmission ; Internet of things ; Rectifying circuits

Electric Equipment:704.2 ; Electric Power Transmission:706.1.1 ; Computer Software, Data Handling and Applications:723

Web of Science

1.Univ Macau, State Key Lab Analog & Mixed Signal VLSL, Macau, Peoples R China
2.Southern Univ Sci & Technol, Shenzhen, Peoples R China
3.Synopsis Ltd, Macau, Peoples R China
4.Univ Lisbon, Inst Super Tecn, Lisbon, Portugal

Mao, Fangyu,Lu, Yan,Lin, Jie,et al. A Single-Stage Current-Mode Active Rectifier with Accurate Output-Current Regulation for IoT[C]. 345 E 47TH ST, NEW YORK, NY 10017 USA:IEEE,2018:1-4.