Design and implementation of a high-efficiency 6.78MHz resonant wireless power transfer system with a 5W fully integrated power receiver

作者：Moon Junil; Hwang Hyeonseok; Jo Byeonghak; Kwon Chan Keun; Kim Tae Geun; Kim Soo Won^*

来源：IET Power Electronics, 2017, 10(5): 577-587.

DOI：10.1049/iet-pel.2016.0107

• inductive power transmission
• resonant power convertors
• AC-DC power convertors
• DC-DC power convertors
• power semiconductor switches
• wireless power transfer system
• resonant WPT system
• mobile phone charger
• resonant type power receiver
• on-chip AC-DC converter
• DC-DC converter
• power switches
• frequency 6
• 78 MHz
• power 5 W

This study presents the design and implementation of a 6.78MHz wireless power transfer (WPT) system that uses magnetically coupled resonance for 5W mobile phone charger applications. For a resonant WPT system, one of the most significant design issues is the power receiver because of its resonant characteristics. A compact resonant-type power receiver is required for high efficiency and robustness. To realise a compact size, a fully integrated 5W power receiver that includes an on-chip AC-DC converter and a DC-DC converter is implemented. A protection circuit that operates only during initial power-up is proposed to protect the power switches in the receiver. The proposed receiver was implemented using a 0.18 mu m bipolar-complementary metal-oxide-semiconductor-double-diffused metal-oxide-semiconductor process with a die area of 3.5mmx3.5mm. The measured maximum power transfer efficiency of the receiver and peak efficiency of the system was 81 and 51%, respectively.

• 出版日期2017-4-21