A device for LED optical communication using the switching ripple of the drive circuit

Abstract

The invention discloses a device for LED optical communication by using drive circuit switch ripples, the topology of the device adopts a DC-DC converter, the control mode adopts constant output current control, and signal transmission is realized through the switch ripples under the condition of not adding any device. According to the device, data transmission is completed under the conditions that normal lighting is not affected and special wired and wireless communication equipment is not additionally arranged, so that the monitoring of the running state of the LED device becomes convenientand fast, and the cost is low; meanwhile, the device provided by the invention uses switch ripples as carrier signals, so that the requirement of the low-speed communication field on data transmission can be met.

Description

technical field [0001] The invention belongs to the technical field of optical communication, and in particular relates to a device for performing LED optical communication by using the switching ripple of a driving circuit. Background technique [0002] Visible light communication is developing rapidly as an emerging technology, because the frequency of visible light is much higher than that of existing wireless communication technologies, and its theoretical communication rate is more than 100 times faster than that of existing technologies. Visible light communication is realized by controlling the on and off of LEDs, because the frequency of LED on and off is very high, beyond the frequency that can be recognized by the naked eye, so visible light communication can ensure normal lighting effects while communicating. At the same time, the LED market is very broad, widely used in TVs, monitors, mobile phones, home lighting, etc., and has become an indispensable part of dai...

AI Technical Summary

Problems solved by technology

like figure 1 As shown, in the signal transmission process, if the on-signal is in front of a symbol, it means 0, and the off-signal is in front, it means 1; this method is low in cost, but the loss is high, because the MOS works in the saturation region, which is equivalent to For linear power supplies, the efficiency calculation is equal to the voltage across the LED divided by the input DC power supply voltage. Generally, in order to ensure normal operation, a certain margin will be reserved between the input DC power supply voltage and the voltage across the LED, which leads to low efficiency. Calculated Efficiency Considering Auxiliary Power Supply

[0005] It can be seen that the LED drive circuits on the existing market are basically a trade-off between cost, efficiency and communication speed, and no solution that can take into account the three aspects at the same time has been proposed.

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