A Primary Side Control Method for Wireless Energy Transmission System

作者：Chan Tso Sheng^*; Chen Chern Lin

来源：IEEE Transactions on Circuits and Systems I-Regular Papers, 2012, 59(8): 1805-1814.

DOI：10.1109/TCSI.2011.2180433

• Class-E amplifier
• LLC resonance
• transcutaneous energy transmission
• primary side control
• zero-voltage-switching (ZVS)

This paper presents a primary side control method for a low power wireless energy transmission system (WETS), with no physical wire connection required between the primary and secondary-side circuits. The primary side control method implemented in the WETS does not require extra space in the secondary side to regulate transmission energy. A charging protection was embedded within the secondary side to monitor the charging current and battery voltage, and to protect the battery against over-charging current or voltage. LLC resonant converter and class-E amplifier structures with zero-voltage switching were utilized to minimize transmission loss due to leakage inductance. In our experiments, the secondary side battery was fed a stable charging current in constant-current mode and low current in constant-voltage mode where the battery voltage reached approximately 4.1 V. The results show that the WETS achieved primary side control in all air-gap conditions. The overall efficiency of the WETS with LLC resonant converter was between 33.5% and 54.1%, and that of the class-E amplifier was between 30% and 66.2% when operating in the constant-current mode.

• 出版日期2012-8
• 单位中国科学院电工研究所