US 12,015,443 B2
Visible light communication system
Zhijian Lv, Shenzhen (CN); Lulu Zha, Shenzhen (CN); Jinpeng Tian, Shenzhen (CN); and Wenwei Zhang, Shenzhen (CN)
Assigned to SHENZHEN TECHNOLOGY UNIVERSITY, Shenzhen (CN)
Appl. No. 18/272,795
Filed by SHENZHEN TECHNOLOGY UNIVERSITY, Shenzhen (CN)
PCT Filed Oct. 25, 2022, PCT No. PCT/CN2022/127179
§ 371(c)(1), (2) Date Jul. 17, 2023,
PCT Pub. No. WO2024/050934, PCT Pub. Date Mar. 14, 2024.
Claims priority of application No. 202211092797.3 (CN), filed on Sep. 8, 2022.
Prior Publication US 2024/0088999 A1, Mar. 14, 2024
Int. Cl. H04B 10/116 (2013.01); H04B 10/516 (2013.01)
CPC H04B 10/116 (2013.01) [H04B 10/516 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A visible light communication system, comprising:
a modulation and light emission module configured to emit a communication light ray obtained by modulating information to be communicated; and
a tracking and light sensing module configured to receive and demodulate the communication light ray to obtain the information to be communicated and further configured to align the tracking and light sensing module with the communication light ray according to an angle between the tracking and light sensing module and the communication light ray;
wherein the tracking and light sensing module comprises:
a light tracking sensor configured to generate light sensing signals of a plurality of regions according to amounts of the communication light ray received in different regions;
a tracking circuit configured to generate a motor driving signal according to the light sensing signals of the plurality of regions; and
an electric motor configured to adjust a direction of a photosensitive plane of the light tracking sensor according to the motor driving signal to align the tracking and light sensing module with the communication light ray;
wherein the light tracking sensor comprises a metal wall, and a first photodiode and a second photodiode that are arranged on two sides of the metal wall, wherein the first photodiode and the second photodiode are configured to generate respective light sensing signals;
wherein the tracking circuit comprises:
a comparison unit configured to compare the light sensing signals of the plurality of regions; and
a switch unit comprising a plurality of switch transistors and configured to determine on/off states of the plurality of switch transistors according to a comparison result of the comparison unit, control an access direction of a drive voltage of the electric motor according to the on/off states of the plurality of switch transistors, and generate the motor driving signal according to the access direction of the drive voltage.