Abstract
This work details a single-stage flyback power factor correction (PFC) converter operating in discontinuous conduction mode (DCM) for visible light communication (VLC). The role of the converter is to regulate the average output current via the duty cycle value for lighting purposes and to modulate digital data by means of the first switching harmonic of the output current. Both features can be achieved simultaneously by modulating the PWM signal fed to the single switch of the flyback converter. In order to allow for the transmission of VLC data, the converter output low-pass filter has been replaced by a 3rd order band-stop (notch) filter and an additional feedforward loop was introduced. This strategy maintains the simplicity of the original topology while granting it the functionality of transmitting VLC data with a reduced component count. Experimental results taken from a 14-W prototype supplied from a 127-V 60-Hz grid were carried out in order to verify the modulation scheme and the feasibility of the VLC transmitter, which was able to transfer data with a bit rate of 15 kb/s over a distance of 2 m with a global efficiency of 93.3% while keeping a good input power factor.
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