A Single-Stage Delay-Tuned Active Rectifier for Constant-Current Constant-Voltage Wireless Charging
Bai,Xianglong1,2; Mao,Fangyu1; Lu,Yan1; Zhan,Chenchang2; Martins,Rui P.1,3
Source PublicationProceedings of 2020 IEEE Asia Pacific Conference on Circuits and Systems, APCCAS 2020
AbstractThis paper presents a single-stage regulated active rectifier with two operation modes of constant-current charging mode (CC) and constant-voltage charging mode (CV) for battery wireless charging. With the delay-tuned active rectifier, the proposed wireless charger can realize AC-DC power rectification, voltage regulation, CC and CV battery charging in a single power stage with high efficiency and small volume. The adaptive tuning of the delay of the power NMOS gate-drive signals, regulates the average charging current at a constant value for the CC mode, and the output voltage for the CV mode. The circuit achieves a precise average AC current sensing with a replica sensing stage. The utilization of a hysteresis comparator detects the output voltage and changes the charging mode during the battery charging process. The proposed single-stage wireless charger, designed in standard 0.35μm CMOS, operates at 6.78MHz. Simulation results show that the efficiency of the entire CC mode is higher than 89.8% with the battery voltage ranging from 2.8V to 4.2V. And we obtain a peak efficiency of 94.3% with 4.2 V and 1A output.
Keywordactive rectifier constant current constant voltage current sensing Li-ion battery charging single-stage wireless charging
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Document TypeConference paper
CollectionUniversity of Macau
Corresponding AuthorLu,Yan
Affiliation1.University of Macau,Institute of Microelectronics and FST-DECE,State Key Lab of AMS-VLSI,Macao
2.Southern University of Science and Technology,School of Microelectronics,Shenzhen,China
3.Instituto Superior Técnico,Universidade de Lisboa,Portugal
First Author AffilicationUniversity of Macau
Corresponding Author AffilicationUniversity of Macau
Recommended Citation
GB/T 7714
Bai,Xianglong,Mao,Fangyu,Lu,Yan,et al. A Single-Stage Delay-Tuned Active Rectifier for Constant-Current Constant-Voltage Wireless Charging[C],2020:47-49.
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