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A pwm/ofdm dimming modulation led lighting and vlc communication circuit and method

A technology of LED lighting and communication method, applied in PWM/OFDM dimming modulated LED lighting and VLC communication circuit and field, to improve the transmission rate and solve the effect of inter-symbol interference

Inactive Publication Date: 2019-06-07
FUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that bipolar OFDM can transmit OFDM signals only in the "on" state of PWM dimming, and the OFDM signal is cut off in the "off" state, and provide a LED lighting modulated by PWM / OFDM dimming Communication circuit and method with VLC

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  • A pwm/ofdm dimming modulation led lighting and vlc communication circuit and method
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  • A pwm/ofdm dimming modulation led lighting and vlc communication circuit and method

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Embodiment Construction

[0020] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments.

[0021] The present invention provides a PWM / OFDM dimming modulated LED lighting and VLC communication circuit, which includes a first LED drive power supply, a second LED drive power supply, a first LED lamp load, a second LED lamp load, a first switch tube, The second switching tube, the network transformer and the visible light communication data source; the anode of the first LED driving power supply is connected to the anode of the first LED lamp load, and the cathode of the first LED lamp load is connected to the drain of the first switching tube; the second The second LED drive power supply is connected to the anode of the second LED lamp load, and the cathode of the second LED lamp load is connected to the drain of the second switching tube; the source of the first switching tube is connected to the source of the second switching tube and...

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Abstract

The invention discloses a PWM / OFDM dimming modulated LED lighting and VLC communication circuit and method. In the circuit, the anode of the first LED drive power supply is connected to the anode of the first LED lamp load, and the cathode of the first LED lamp load is connected to the anode of the first LED lamp load. The drain of the first switching tube is connected; the second LED drive power supply is connected to the anode of the second LED lamp load, and the cathode of the second LED lamp load is connected to the drain of the second switching tube; the source of the first switching tube is connected to the drain of the second switching tube respectively. The source of the second switching tube is connected to one end of the secondary winding of the network transformer; the negative terminal of the first LED driving power is respectively connected to the other end of the secondary winding of the network transformer and the negative terminal of the second LED driving power; the visible light communication data source One end is connected to one end of the primary winding of the network transformer, and the other end of the visible light communication data source is connected to the other end of the primary winding of the network transformer. The invention not only realizes the OFDM fast algorithm of VLC communication, but also takes into account the optical characteristic requirement of lighting dimming.

Description

technical field [0001] The invention belongs to the field of lighting and communication dimming capable of realizing lighting dimming and visible light communication at high communication rates, and in particular relates to an LED lighting and visible light communication dimming circuit and method thereof combining PWM dimming and OFDM. Background technique [0002] As the fourth-generation lighting source, LED is a semiconductor solid-state lighting device. Compared with incandescent lamps and energy-saving lamps, LED not only has high efficiency, long life, small size, but also has the advantages of short response time and good modulation performance. [0003] Visible Light Communication (VLC) technology uses the high-speed response speed and modulation performance of white LEDs to modulate the signal to the visible light emitted by LED lamps to realize lighting and The dual role of communication. IEEE has formulated OOK, CSK, and VPPM modulation methods commonly used in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/114H04B10/116H04L27/26H05B33/08H05B44/00
CPCH04B10/1143H04B10/116H04L27/2697H05B45/00H05B44/00
Inventor 林维明刘贤庆
Owner FUZHOU UNIV
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