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New wireless charging chip can be used for resonant wireless power transmission
[ Instrument R & D of Instrument Network ] Recently, Professor Cheng Lin of the National Demonstration Microelectronics University of China University of Science and Technology and Professor of Hong Kong University of Science and Technology and Yongxiong Research Group have made new progress in the field of wireless charging chip design. Researchers have proposed a new wireless charging chip architecture for resonant wireless power transmission. The proposed architecture achieves high efficiency and low cost by implementing rectification, voltage regulation, and constant current-constant voltage charging in a single power stage, providing an efficient solution for the design of future wireless charging chips.
As the future development direction of charging technology, wireless charging has broad application prospects in consumer electronics, biomedical electronics, Internet of Things and electric vehicles. In recent years, it has received great attention from academia and industry. Compared with traditional wired charging with stable DC voltage, wireless charging first needs to rectify and stabilize the AC output voltage.
The wireless power supply chip is easy to use due to its high integration and few peripheral circuits. It is usually used in the charging of frequently moving electrical appliances, the power supply and charging of waterproof electrical appliances, and some places or electrical appliances that cannot be powered by circuits or are inconvenient to use wires. The transmitting part and receiving part of this type of chip are completely separated, without any physical connection, so it is conducive to isolation, sealing and waterproof, and high safety; any non-metallic object can be placed between transmitting and receiving, but it cannot penetrate Metal is determined by the common characteristics of electromagnetic resonance. In addition, due to the openness of the system, there are certain heat losses and magnetic losses, and the efficiency is lower than that of wired power supply.
In addition, an on-chip gate voltage bootstrap technique was also proposed in this study. An adaptive phase-number-controlled single-input dual-output voltage doubler was used to integrate the bootstrap capacitor on the chip, further improving chip integration degree. The final test results show that the peak efficiency of the wireless charging chip can reach 92.3% and 91.4% when the charging current is 1A and 1.5A, respectively, which verifies the effectiveness of the proposed technology.
Due to multi-level power processing, the charging efficiency is greatly reduced, and the charging power is severely limited. Focusing on the research hotspots of improving conversion efficiency and reducing costs in the field of wireless charging chip design, this research is based on the principle of 3-Mode reconfigurable resonant regulator rectifier, by implementing rectification, voltage regulation and constant current-constant voltage charging functions in a single power stage , Overcoming the shortcomings of the need for two-level or three-level cascade in the existing chip design, thereby greatly improving the chip conversion efficiency and integration.