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The High-efficiency LED Driver for Visible Light Communication Applications.

Cihun-Siyong Alex Gong1,2,3, Yu-Chen Lee4, Jyun-Liang Lai4

  • 1Department of Electrical Engineering, College of Engineering, Chang Gung University, Taoyuan 33302, Taiwan.

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This study introduces a new LED driver for Visible Light Communication (VLC) using Gallium Nitride (GaN) power devices. This innovation significantly boosts data rates and system efficiency for VLC applications.

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Area of Science:

  • Electrical Engineering
  • Optoelectronics
  • Power Electronics

Background:

  • Traditional switching LED drivers for Visible Light Communication (VLC) suffer from low data rates.
  • Silicon power devices limit the switching frequency, hindering bandwidth for data transmission.

Purpose of the Study:

  • To develop a high-speed, efficient LED driver for VLC applications.
  • To overcome the data rate limitations inherent in conventional switching LED drivers.

Main Methods:

  • Proposed a novel LED driver design utilizing Gallium Nitride (GaN) power devices.
  • Replaced traditional silicon power devices with GaN counterparts to increase switching frequency.
  • Employed a diode-connected GaN power transistor to enhance efficiency, replacing ultrafast recovery diodes.

Main Results:

  • The developed driver supports data transmission using Pulse Position Modulation (PPM) encoding for PWM dimming levels in VLC.
  • Experimental evaluation at 350-mA output current demonstrated successful data support.
  • Achieved a system efficiency of 80.8% at a data rate of 1-Mb/s.

Conclusions:

  • The GaN-based LED driver effectively addresses the low data rate problem in VLC systems.
  • The proposed design offers a significant improvement in data transmission bandwidth and overall system efficiency.
  • This technology paves the way for higher performance VLC applications.