A resonant drive extraction circuit for led visible light communication

Abstract

The invention relates to a resonant drive extraction circuit for LED visible light communication. The resonant drive extraction circuit includes a first drive power supply, a second drive power supply, a power MOS switch tube Q1, a power MOS switch tube Q2, and a power MOS switch tube. Switching tube Q3, a power MOS switching tube Q4, a set of LED lamp load Dled, a power diode D2, a power diode D3, a power diode D4, a power diode D5, a resonant inductor L1, a gate resistor Rg1, a A gate resistor Rg2, a gate resistor Rg3, and a communication data modulation driving signal VDATA. The present invention proposes a resonant drive extraction circuit. By charging the additional resonant inductor L1 in advance during the turn-on period of the LED light load Dled, the inductance current reaches the maximum value when the LED light load Dled is turned off; when the LED light load Dled is turned off, let Resonance occurs between the inductor L1 and the junction capacitance of Dled to realize fast extraction of the charge stored in the junction capacitance, which speeds up the extraction speed of the charge and improves the LED visible light communication rate.

Description

technical field [0001] The invention relates to the field of LED visible light communication, in particular to a resonant drive extraction circuit for LED visible light communication, so as to increase the rate of visible light communication. Background technique [0002] There are some limiting factors in the development of visible light communication technology. The main challenge lies in the limited bandwidth of white LEDs, which limits the communication rate. The modulation bandwidth of LEDs is mainly affected by the carrier recombination life of the active region and the capacitance of the PN junction. In the LED off stage after the electric pulse ends, the carriers stored in the active region will not be quenched immediately when the current disappears. At this time, all the remaining The light emission can only end after the electron finds the hole and recombines, so the falling edge of the light pulse of the LED has a relatively long tail phenomenon. Pulse modulatio...

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Problems solved by technology

[0002] There are some limiting factors in the development of visible light communication technology. The main challenge lies in the limited bandwidth of white LEDs, which limits the communication rate. The modulation bandwidth of LEDs is mainly affected by the carrier recombination life of the active region and the capacitance of the PN junction.

In the LED off stage after the electric pulse ends, the carriers stored in the active region will not be quenched immediately when the current disappears. At this time, all the remaining The light emission can only end after the electron finds the hole and recombines, so there is a relatively long tailing phenomenon on the falling edge of the light pulse of the LED.

Pulse modulation is often used in visible light communication. If the edge delay time of the optical pulse is too long, the higher modulation rate will generate intersymbol interference, and it will also cause difficulties in the selection of sampling time at the receiving end.

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