Resonant drive dissociation circuit for LED visible-light communication
A technology of visible light communication and driving power, applied in electrical components, short-distance systems, output power conversion devices, etc., can solve the problems of light pulse falling edge length, tailing, and communication rate limitation, so as to accelerate charge extraction Speed, fast charge extraction speed, and the effect of increasing the communication rate
Inactive Publication Date: 2016-03-02
FUZHOU UNIV
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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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[0015] Attached below Figure 1-3 , the technical solution of the present invention is described in detail.
[0016] A resonant drive extraction circuit for LED visible light communication according to an embodiment of the present invention is specifically a drive circuit for accelerating the speed of LED visible light communication through a resonant extraction circuit, including a set of LED lamp loads D led , characterized in that: also includes an output DC power supply V 1 The first drive power supply, the anode of the first drive power supply is loaded by the LED lamp D led Connect to a power MOS tube Q 1 ; The LED lamp load D led The cathode and power MOS tube Q 1 drain and a power diode D 3 The cathode is connected; the power MOS transistor Q 1 The source of the first driving power supply is grounded; the negative pole of the first driving power supply is grounded; the positive pole of the first driving power supply is connected to the LED lamp load D led The an...
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The invention relates to a resonant drive dissociation circuit for LED visible-light communication. The resonant drive dissociation circuit comprises a first drive power supply, a second power supply, a power MOS switch tube Q1, a power MOS switch tube Q2, a power MOS switch tube Q3, a power MOS switch tube Q4, a group of LED lamp loads Dled, a power diode D2, a power diode D3, a power diode D4, a power diode D5, a resonant inductor L1, a grid resistor Rg1, a grid resistor Rg2, a grid resistor Rg3 and a communication data modulation drive signal VDAT. According to the resonant drive dissociation circuit provided by the invention, during the period that the LED lamp loads Dled are opened, the added resonant inductor L1 is charged in advance and the current of the inductor reaches the maximum value when the LED lamp loads Dled are shut off; and when the LED lamp loads Dled are shut off, the inductor L1 and junction capacitors of the LED lamp loads Dled generate resonance, so that quick dissociation of charges stored by the junction capacitors is achieved; and the charge dissociation speed is increased to improve 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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IPC IPC(8): H02M1/32
CPCH02M1/32H04B10/116H02M1/322
Inventor林维明陈红星
OwnerFUZHOU UNIV