Hard- and Soft-Switched
Technical Lecture Session
DC-DC Converter Applications
Visible Light Communication, High frequency DC-DC converter, LED driver, communication
This work proposes a modification of the Two Input Buck converter (TIBuck) as a high efficiency driver for LEDs and transmitter for Visible Light Communication (VLC). Due to the lower harmonic components and also lower voltage stress over the switches, the TIBuck converter is a suitable option for high frequency and fast response converter with lower switching losses and less filtering action required than the conventional buck converter, outperforming it in terms of efficiency and communication capa- bility. The second voltage source needed by the TIBuck converter is provided by means of an auxiliary Buck converter, that also implements the average current control over the LEDs. The efficiency of the converter is improved by reducing the power that is been processed at high frequency and using instead the auxiliary Buck converter with lower switching frequency. As experimental results, a TIBuck converter is built based on a low frequency and a high frequency Buck converters connected in parallel regarding the load. The topology reaches a 94% of efficiency reproducing a 64-QAM with a bitrate up to 1.5 Mbps.