Abstract
Visible light communication (VLC) shows up as a trend for short-range wireless networks. However, from the energy point of view, there is still a lack of light-emitting diode (LED) drivers that support considerable data rates with high efficiency. Common solutions would include switched-mode power converters (SMPCs), which are efficient, but they still face challenges regarding the modulation bandwidth (BW) for VLC. Thus, this article presents an analysis of a preemphasis (PE) technique to overcome the low BW constraint of the SMPC. The PE filter is used to render the frequency response of the circuit to provide a wider BW for communications. It operates on the duty cycle of the converter, and it dictates the average output signal value over a switching period. Finally, the technique is presented in a theoretical approach with the aligned experimental results in a 21.5-W buck-converter-based LED driver switched at 1 MHz, with 89% efficiency and an increased modulation BW from 8.12 to 450 kHz (55 times).
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: IEEE Journal of Emerging and Selected Topics in Power Electronics
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
