An LED driver for simultaneous DC power line communication and visible light communication

Abstract

The invention discloses an LED driver capable of simultaneously realizing direct-current power line communication and visible light communication. The purpose of data transmission is achieved by utilizing PWM (Pulse-Width Modulation) signals, and bidirectional flow of data in a PLC (Programmable Logic Controller) at two terminals is realized by a working mode of the LED driver. In the field of low-speed communication, the LED driver has the advantages of being small in size and low in cost, compared with an LED driver without inheritance of communication, only one signal collection circuit isadded, hardware composition of the circuit is simple and easy to achieve, and cost and size consideration can be basically ignored. Meanwhile, by using the communication mode of the invention, a low bit error rate can be realized, the communication quality is ensured, and the phenomenon of unstable communication caused by the problems of bit error, bit missing and the like is reduced.

Description

technical field [0001] The invention belongs to the technical field of power electronics and communication, and in particular relates to an LED driver for simultaneously realizing DC power line communication and visible light communication. Background technique [0002] LED lighting is the mainstream of the development of modern lighting technology. LED drivers usually use DC / DC converter circuits to adjust the brightness by adjusting the output current. LED lighting can also be used for visible light communication, because the output bandwidth of LED is very wide, so high-frequency carrier modulation can be used to realize digital communication. Compared with commonly used wireless communication technologies such as Wifi, visible light communication can realize data communication by relying on daily lighting, which has the advantages of low cost and high security. [0003] However, there is no widely accepted design model for LED drivers with visible light communication fu...

AI Technical Summary

Problems solved by technology

Taking the article published by Professor Song Jian in IEEE as an example, the principle of the communication system is to couple the data into the power line through the "PLC module", and there is a "PLC to VLC module" at the end of the power line, and then the data Visible light output; in such a working mode, a serious problem is that the signal cannot be transmitted back, that is, the signal cannot be output on the power line from the "PLC to VLC module". One solution to this problem is in the "PLC to VLC module" "Using another "PLC module" on the "PLC to VLC module" will lead to an increase in the size and cost of the "PLC to VLC module"; another solution is to use the "PLC to VLC module" own switching device to modulate the data and perform data conversion. Compared with the former, the communication rate of this scheme is lower, but it has great advantages in volume and cost.

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