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Area of Science:

  • Electrical Engineering
  • Optical Communications
  • Solid-State Lighting

Background:

  • Visible light communication (VLC) offers an alternative to radio frequency (RF) wireless systems.
  • LEDs enable fast modulation for VLC, requiring efficient LED drivers.
  • High bandwidth demands in VLC present design challenges for switching-mode dc-to-dc converters (SMCdc-dc).

Purpose of the Study:

  • To present and evaluate methods for achieving high bandwidth in SMCdc-dc converters for VLC transmitters.
  • To demonstrate that VLC can be integrated into solid-state lighting (SSL) without compromising power efficiency.

Main Methods:

  • Investigated three strategies: increasing output filter order, increasing voltage inputs, and increasing phase count.
  • Developed an experimental VLC transmitter using a two-phase buck converter with a fourth-order output filter.

Main Results:

  • Achieved bandwidths in the hundreds of kilohertz (kHz).
  • Demonstrated high power efficiency (85-90%) at output power levels near 10 W.
  • Confirmed the effectiveness of combined strategies for specific VLC applications.

Conclusions:

  • The proposed design strategies enable high-bandwidth VLC integration into SSL systems.
  • High bit rates are achievable with maintained power efficiency in LED lighting.
  • Optimized SMCdc-dc converter design is crucial for effective VLC transmitters.