Transmitting device and method for driving LED automotive lamp optical communication

Abstract

The invention relates to a transmitting device for driving LED automotive lamp optical communication. The transmitting device comprises a CPU and a voltage conversion circuit. The CPU is in communication connection with an automobile LIN / CAN bus through an interface circuit, and the CPU is in communication connection with the voltage conversion circuit. The voltage conversion circuit is in driving connection with an LED automotive lamp through a high-frequency semiconductor switch. The LED automotive lamp is equipped with a forward voltage test circuit of which the output end is connected with the CPU. The level output end of the CPU is sequentially connected with a D / A conversion circuit, a low-pass filtering circuit and a constant-current voltage control circuit, and the output end of the constant-current voltage control circuit is connected with the reference voltage end of the voltage conversion circuit. The invention further provides a method for driving LED automotive lamp optical communication, through which the level and frequency of the current waveform of communication data can be dynamically adjusted. The problem that the lighting effect and energy-saving performance of the LED automotive lamp are affected by the communication function in the existing optical communication technology is solved.

Description

technical field [0001] The invention relates to visible light communication technology, in particular to a transmitting device and method for driving LED vehicle light communication. Background technique [0002] Visible light communication technology is to modulate the visible light source, and send information by controlling the high-speed flickering of LED light intensity. In actual application, under the specified light intensity, it is required that the communication modulation cannot affect the normal lighting brightness. [0003] Common light intensity modulation methods include TRIAC Dimming, Digital Dimming, Pulse Width Modulation Dimming, and Analog Dimming. Among them, pulse width modulation dimming is to control the duty cycle of the current pulse signal by opening and closing the switch at a certain frequency, so as to realize the modulation of the luminous intensity of the LED. When the light-emitting frequency of the LED is above 60Hz, the human eyes cannot ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a transmission device and method for driving LED car light communication, which can solve the problems in the prior art that the communication function affects the lighting efficiency, power saving and reliability of LED car lights

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