LED drive circuit with high speed and high conversion efficiency for visible light communication

A visible light communication and LED driving technology, applied in the field of visible light communication, can solve the problems of phosphor LED long response time modulation bandwidth, etc., and achieve the effects of strong anti-interference and confidentiality, good application prospects, and reduced system volume

Inactive Publication Date: 2017-02-15
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the longer response time of phosphor LEDs makes their modulation bandwidth typically less than 2MHz
This will become the design bottleneck of VLC high-speed communication

Method used

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  • LED drive circuit with high speed and high conversion efficiency for visible light communication
  • LED drive circuit with high speed and high conversion efficiency for visible light communication
  • LED drive circuit with high speed and high conversion efficiency for visible light communication

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Embodiment Construction

[0021] The LED driving circuit with high rate and high conversion efficiency for visible light communication of the present invention will be described in detail below in conjunction with embodiments and drawings.

[0022] Such as figure 1 As shown, the LED driving circuit with high rate and high conversion efficiency for visible light communication of the present invention includes a pre-emphasis circuit 1, a control circuit 2, a first MOS tube M1 and a second MOS tube M2, one of the control circuit 2 The power signal input terminal is connected to the DC bias signal input DC, the external power input terminal is connected to the external power supply VDD2, the signal input terminal is connected to the data signal input AC through the pre-emphasis circuit 1, and the power output negative pole of the control circuit 2 passes through the first The resistor R1 is grounded, the power output anode is connected to the gate of the first MOS transistor M1, the source of the first MOS tra...

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Abstract

The present invention provides a LED drive circuit with high speed and high conversion efficiency for visible light communication. The circuit comprises a pre-emphasis circuit, a control circuit, a first MOS tube and a second MOS tube. One power supply signal input end of a control circuit is connected with the direct current bias signal input, an external power supply input end is connected with an external power supply, the signal input end is connected with the data signal input through the pre-emphasis circuit, the power output cathode of the control circuit is grounded through a first resistor, the power output anode is connected with the grid electrode of the first MOS tube, the source electrode of the first MOS tube is grounded through the first resistor, the drain electrode is connected with the drain electrode of the second MOS tube, the grid electrode of the second MOS tube is connected with the external power supply, the source electrode is connected with the cathode of a light emitting diode, and the anode of the light emitting diode is connected with the external power supply. The LED drive circuit with high speed and high conversion efficiency for visible light communication greatly improves the bandwidth of the VLC system. The LED drive circuit with high speed and high conversion efficiency for visible light communication employs a single power supply device to control the alternating current signal and the direct current signal to reach the purpose of high speed, high efficiency and high integration level.

Description

Technical field [0001] The invention relates to a visible light communication. In particular, it relates to a high-rate and high-conversion-efficiency LED driving circuit for visible light communication using a pre-emphasis circuit and impedance attenuation. Background technique [0002] In recent years, with the rapid development of electronic technology, the total number of users and penetration rate of smart devices have increased significantly year by year, and the demand for high-speed broadband multimedia communications has increased accordingly. At this time, traditional radio frequency communication is in a situation of tight spectrum resources, coupled with the limitations of electromagnetic radiation interference and other factors, and people’s increasing attention to the impact of radiation on health, prompting the creation of a resource that can broaden the spectrum. Green and energy-saving LED lights are used for The communication method of the transmission base sta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/00
Inventor 毛陆虹闫俊松谢生肖谧
Owner TIANJIN UNIV
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