scholarly journals Wireless Power Transfer Systems: Multifunctional High‐Power Sources for Smart Contact Lenses (Adv. Funct. Mater. 29/2020)

2020 ◽  
Vol 30 (29) ◽  
pp. 2070191 ◽  
Author(s):  
Taiki Takamatsu ◽  
Yin Sijie ◽  
Fang Shujie ◽  
Liu Xiaohan ◽  
Takeo Miyake
Keyword(s):  
High Power ◽  
Contact Lenses ◽  
Wireless Power Transfer ◽  
Power Transfer ◽  
Wireless Power ◽  
Power Sources

scholarly journals Metal Object Detection in a Wireless High-Power Transfer System Using Phase–Magnitude Variation

Electronics ◽  
2021 ◽  
Vol 10 (23) ◽  
pp. 2952
Author(s):  
Sunhee Kim ◽  
Woong Choi ◽  
Yongseok Lim
Keyword(s):  
High Power ◽  
Moving Objects ◽  
Detection System ◽  
Wireless Power Transfer ◽  
Transfer System ◽  
Power Transfer ◽  
Wireless Power ◽  
Metal Object ◽  
Fire Hazards ◽  
Detection Coil

Recently, wireless charging technologies for large moving objects, such as electric vehicles and robots, have been actively researched. The power transmitting and receiving coils in most large moving objects are structurally separated by a given distance, which exposes a high output power to the outside world. If a foreign metal object enters the area between these two coils during wireless power transfer, fire hazards or equipment damage may occur. Therefore, we propose a method for detecting foreign metal objects in the gap between the transmitting and receiving coils in a wireless high-power transfer system. A resonant detection coil set is used to exploit the change induced in electrical characteristics when a foreign metal object is inserted. The mutual inductance of the foreign metal object changes the impedance of the detection coil set. We developed a simple circuit to detect both the magnitude and phase change of the voltage signal according to the altered impedance. Additionally, we implemented a prototype of a wireless power transfer system with a detection system to verify that even small foreign metal objects can be detected effectively.

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