Figure 1 - available via license: Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Content may be subject to copyright.
A typical setting for indoor LPT (A) Operating range of the LPT system. (B) Key parameters for estimating actuator resolution.
Source publication
Laser power transfer (LPT) is an emerging technology that can provide convenient and long-range wireless power to the ever-expanding array of electronic devices. One of the biggest challenges in implementing LPT systems is to realize receiver positioning and beam steering (RPBS) for directing power toward the intended target which, however, have on...
Contexts in source publication
Context 1
... clearly describe the difficulty, the scope of discussion is confined within such a WPT application: a device that is freely movable in an indoor environment, meanwhile demanding watt-level power supply. Figure 1A illustrates an example setting, where the transmitter is mounted on the ceiling of a room, in charge of the power transmission for the devices on (or above) the table. The transmitter has a field of regard (FoR), which specifies the total region that can be precisely beamed at by the laser; if the receiver lies within the FoR without occlusion, the power should be transmitted successfully. ...
Context 2
... key factors involving these functionalities are the maximum operating height (i.e., the vertical distance between transmitter and receiver), the transmitter's FoR, and the speed and accuracy of the beam steering apparatus. In a room setting as with Figure 1A, the maximum operating height is usually 2 m or greater, and the transmitter's FoR can be approximated by a cone, whose range is defined by the apex angle. The beam steering time should be as fast as possible and the incident position of the laser beam is the center of the receiver. ...
Context 3
... protocols offer quantifiable metrics that can be readily generalized to future studies. Based on the setting shown in Figure 1A, the following design principles are proposed, intended to assist in the design of LPT systems applied in similar cases. Optimize transmitter's FoR. ...
Context 4
... an LPT system, rotary actuators are required to steer the laser beam to different angles, and their resolution is the smallest possible angle that the actuator is able to rotate by. The smallest required angle can be estimated by the limiting case shown in Figure 1B: the laser beam is pointing at one edge of the PLPC, and the angular resolution is at least Dq in order for the actuator to steer the beam to the center of the PLPC. Therefore, the angular resolution can then be estimated by Dq = w 3 cos q tilt h=cos q max ; ...
