Abstract
Optical wireless power transmission (OWPT) is a technology that supplies energy remotely. Due to the great advantages of long transmission distances, high directionality, no electromagnetic interference noise, and loose safety regulations, light emitting diode (LED) based OWPT systems become appropriate candidates for powering various applications, especially for the Internet of things (IoT). In this paper, improved LED-OWPT systems are proposed based on a collimation scheme for optimizing the system dimension and output. In a single LED configuration, the system dimension is compressed by 46% while the high transmission efficiency is maintained. As for the LED-array system, the dimension is compressed by 56%, and the output is enhanced by 40%. In the experiment, a high electricity output of 532 mW is achieved at 1 m transmission distance. In addition, the effect of misalignment between LED and lens and the potential of long-distance transmission are clarified in the LED-array OWPT system.
Highlights
IntroductionWireless power transmission (WPT) is an important trending technology and has become a highly active research area because of the possible convenience for daily lives
Wireless power transmission (WPT) is an important trending technology and has become a highly active research area because of the possible convenience for daily lives.WPT is a technology to transmit energy remotely from a power source to an electrical load [1]
The improved light emitting diode (LED)-Optical wireless power transmission (OWPT) systems were designed with a small dimension and high output; novel lens combinations were proposed based on a collimation scheme
Summary
Wireless power transmission (WPT) is an important trending technology and has become a highly active research area because of the possible convenience for daily lives. WPT is a technology to transmit energy remotely from a power source to an electrical load [1]. This possibly reduces or eliminates the need for cables and batteries, and provides sufficiently large power for achieving high functionality [2]. Wireless power transfer technologies can be categorized by transmission area into far and near fields [3]. The main near-field mechanisms are categorized according to the type of coupling technique, such as resonant coupling, inductive coupling, and capacitive coupling
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