CN103561525A - Optical communication device based on white light LED illumination - Google Patents
Optical communication device based on white light LED illumination Download PDFInfo
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- CN103561525A CN103561525A CN201310573918.0A CN201310573918A CN103561525A CN 103561525 A CN103561525 A CN 103561525A CN 201310573918 A CN201310573918 A CN 201310573918A CN 103561525 A CN103561525 A CN 103561525A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The invention provides an optical communication device based on white light LED illumination. A communication function is achieved through an LED illuminating lamp array, cost is low, energy is saved, and the environment is protected. The optical communication device based on the white light LED illumination comprises a transmitting end and a receiving end, wherein the transmitting end comprises an LED modulation driving circuit connected with the LED illuminating lamp array, and the receiving end comprises an LED optical communication receiving circuit. The LED modulation driving circuit comprises a full-wave rectification bridge composed of four diodes capable of being connected into an alternating current power supply, the direct current voltage output end of the full-wave rectification bridge is connected with an energy-storage capacitor in parallel, the two ends of the energy-storage capacitor are connected with a filter circuit, the output end of the filter circuit is connected with a light modulation driving chip, a switch control pin of the chip is connected with the negative electrode of the LED illuminating lamp array, a switch pin of the chip is connected with the negative electrode of a voltage stabilizing diode and one end of an inductor, and the other end of the inductor is connected with the negative electrode of the LED illuminating lamp array and one end of a protective capacitor. The LED optical communication receiving circuit comprises a PIN photoelectric detector, an amplifying circuit and a signal processing unit.
Description
Technical field
The present invention relates to optical communication field, particularly relate to a kind of optical communication apparatus based on White-light LED illumination.
Background technology
In recent years, LED lamp, as the lighting apparatus of a kind of low-carbon (LC), energy-saving and environmental protection, is understood by people gradually, is also the strategic new industry of fostering energetically as national and local government in intelligent lighting field.LED is had an optimistic view of by industry with its bright-coloured abundant color, extra long life and extremely strong security performance, gradually common illuminating lamp (as incandescent lamp) has been eliminated out to illumination market.Expert's expectation is about 2015, and LED illumination will realize universalness.There is research report to show: LED illumination research has again new technology to break through, and can directly by LED light, carry out the connection of broadband network a few days ago.
LED lamp is different from conventional illumination device, and it is energy saving not only, also can send modulation signal by switch motion at a high speed, completes the transmission of information and instruction.LED is luminous is flickering, flash very high frequency, the speed of switch per second reaches as high as 2,000,000 times, and ceaselessly switch motion can not affect normal illumination use, more can not exert an influence to human body, because can't see so fast frequency change for people's naked eyes at all.This flashing is exactly a kind of open and close process in fact, this one open-one close of LED just can have been born the task of transmission information, such as, open just representative " 1 ", close just representative " 0 ", by namely 0 and 1 various combinations of information coding, just can transmit by light, light in air, transmit be just similar in optical fiber communication information in optical fiber, transmit the same, the basic principle of Here it is LED visible light communication.LED is as semiconductor device, and the light on and off of this high speed namely make-break capacity of switch are its characteristics, and incandescent lamp is damaged because of being very easy in the change procedure of light on and off, and light on and off transition activities is too slow, thereby does not possess this communication function.The receiving equipment of settling within the scope of LED light-illuminating just can receiving optical signals, and light signal can be converted to the signal of telecommunication, realizes the reception of information, instruction.
Summary of the invention
The invention provides a kind of optical communication apparatus based on White-light LED illumination, make LED illuminating lamp array realize communication function, stable signal transmission, bandwidth is high, fast response time; And cost is low, energy-conserving and environment-protective.
Technical scheme of the present invention is:
An optical communication apparatus based on White-light LED illumination, is characterized in that, comprises transmitting terminal and receiving terminal, and described transmitting terminal comprises the LED modulation drive circuit being connected with LED lamp array, and described receiving terminal comprises LED optical communication receiving circuit;
Described LED modulation drive circuit comprises the full-wave rectification bridge being comprised of four diodes that can incoming transport power supply, the DC voltage output end of the described full-wave rectification bridge storage capacitor C1 that is connected in parallel, the two ends of storage capacitor C1 connect RC filter circuit again, one end of the resistance R 1 of RC filter circuit connects the positive output end of storage capacitor C1, and filter capacitor C2 is connected in parallel between the other end of resistance R 1 and the negative output terminal of storage capacitor C1; The output of RC filter circuit connects power supply pin VBAT and the ground pin GND that light modulation drives chip IC, light modulation drives the switch of chip IC to control the negative pole that pin CTRL connects LED lamp array, light modulation drives the switch pin SW of chip IC to connect the negative pole of a voltage stabilizing didoe D1 and one end of inductance L 1, the other end of inductance L 1 connects the negative pole of LED lamp array and one end of protection capacitor C 4, and the other end anodal and with protecting capacitor C 4 of the positive pole of LED lamp array, voltage stabilizing didoe is all connected the VBAT pin that light modulation drives chip IC; Light modulation drives the reseting pin RSET of chip IC by resistance R 2, to connect the negative output terminal of RC filter circuit;
Described receiving circuit comprises PIN photoelectric detector, amplifying circuit and signal processing unit, described PIN photoelectric detector is PIN photodiode D1, described amplifying circuit comprises first crystal triode Q3 and the second transistor Q4, the collector electrode of first crystal triode Q3 connects the base stage of the second transistor Q4 by capacitor C 6, the collector electrode of first crystal triode Q3 also connects 5V power supply by protective resistance R9, the collector electrode of the second transistor Q4 connects 5V power supply by protective resistance R11, between the collector electrode of first crystal triode Q3 and base stage, there is biasing resistor R8, between the collector electrode of the second transistor Q4 and base stage, there is biasing resistor R10, the base stage of first crystal triode Q3 connects the negative pole of PIN photodiode D1 and one end of regulating resistance R7 by capacitor C 5, and the other end of regulating resistance R7 and the emitter of first crystal triode Q3 and the emitter of the second transistor Q4 are altogether, the positive pole of PIN photodiode D1 connects 5V power supply, described signal processing unit comprises DSP decoder module, FPGA system control module, MAC protocol process module and Network Interface Module, the input of described DSP decoder module connects the collector electrode of the second transistor Q4, the output of DSP decoder module connects respectively FPGA system control module and MAC protocol process module, MAC protocol process module interconnection network interface module.
Described LED lamp array is RGB-LED lamp array, and by red, green, blue three-color LED chip package together, the light that they send mixes and obtains white light described RGB-LED lamp array.
Technique effect of the present invention: the invention provides a kind of optical communication apparatus based on White-light LED illumination, make LED illuminating lamp array realize communication function, have stable signal transmission, bandwidth is high, the feature of fast response time, and cost is low, energy-conserving and environment-protective.
The transmitting terminal of apparatus of the present invention comprises the LED modulation drive circuit being connected with LED lamp array, can incoming transport power supply, strong adaptability, can in wider voltage range, keep efficient, to LED, provide stable operating voltage, make the LED can steady operation, meet lighting requirement, and must have very high switching rate just can take into account communication, and therefore adopt light modulation to drive chip IC, there is higher switching rate and power consumption lower; Original binary bit stream, after preliminary treatment and coding, by LED modulation drive circuit driving LED, is carried out intensity modulated to LED, converts electrical signals to light signal; The LED lamp array being connected with LED modulation drive circuit is RGB-LED lamp array, RGB-LED lamp array is to adopt red, green, blue three-color LED chip package together, the light that they send mixes and obtains white light, and RGB-LED has very high modulation bandwidth, can realize very high transmission rate.
The receiving circuit of apparatus of the present invention receiving terminal comprises PIN photoelectric detector, amplifying circuit and signal processing unit, LED light signal is converted to the signal of telecommunication through photoelectric detector, then the signal of telecommunication amplified and process, by signal processing unit, carry out Digital Signal Processing again, under the control of FPGA system control module, by DSP decoder module, carry out DSP decoding demodulation, by MAC protocol process module and Network Interface Module, transfer out output signal.DSP decoder module adopts general or special purpose digital signal processing chip, DSP is had flexibly, accurately, good reliability, volume is little, cost is low, these advantages in the communications field of high arithmetic speed are applied in optical communication, arithmetic speed and the reliability of optical communication have greatly been improved, reduce circuit volume, reduced manufacturing cost.
Accompanying drawing explanation
Fig. 1 is the LED modulation drive circuit structure chart of apparatus of the present invention.
Fig. 2 is the LED optical communication receiving circuit structure chart of apparatus of the present invention.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are described in further detail.
An optical communication apparatus based on White-light LED illumination, comprises transmitting terminal and receiving terminal, and transmitting terminal comprises the LED modulation drive circuit being connected with LED lamp array, and receiving terminal comprises LED optical communication receiving circuit.
As shown in Figure 1, be the LED modulation drive circuit structure chart of apparatus of the present invention.LED modulation drive circuit comprises the full-wave rectification bridge being comprised of four diodes that can incoming transport power supply, the DC voltage output end of the full-wave rectification bridge storage capacitor C1 that is connected in parallel, the two ends of storage capacitor C1 connect RC filter circuit again, one end of the resistance R 1 of RC filter circuit connects the positive output end of storage capacitor C1, and filter capacitor C2 is connected in parallel between the other end of resistance R 1 and the negative output terminal of storage capacitor C1; The output of RC filter circuit connects power supply pin VBAT and the ground pin GND that light modulation drives chip IC, light modulation drives the switch of chip IC to control the negative pole that pin CTRL connects LED lamp array, light modulation drives the switch pin SW of chip IC to connect the negative pole of a voltage stabilizing didoe D1 and one end of inductance L 1, the other end of inductance L 1 connects the negative pole of LED lamp array and one end of protection capacitor C 4, and the positive pole of LED lamp array, the protection other end of capacitor C 4 and the positive pole of voltage stabilizing didoe are all connected the VBAT pin that light modulation drives chip IC; Light modulation drives the reseting pin RSET of chip IC by resistance R 2, to connect the negative output terminal of RC filter circuit.The LED lamp array being connected with LED modulation drive circuit is RGB-LED lamp array, and RGB-LED lamp array is by red, green, blue three-color LED chip package together, and the light that they send mixes and obtains white light.
As shown in Figure 2, be the LED optical communication receiving circuit structure chart of apparatus of the present invention.An optical communication receiving circuit, comprises PIN photoelectric detector, amplifying circuit and signal processing unit, PIN photoelectric detector is PIN photodiode D1, amplifying circuit comprises first crystal triode Q3 and the second transistor Q4, the collector electrode of first crystal triode Q3 connects the base stage of the second transistor Q4 by capacitor C 6, the collector electrode of first crystal triode Q3 also connects 5V power supply by protective resistance R9, the collector electrode of the second transistor Q4 connects 5V power supply by protective resistance R11, between the collector electrode of first crystal triode Q3 and base stage, there is biasing resistor R8, between the collector electrode of the second transistor Q4 and base stage, there is biasing resistor R10, the base stage of first crystal triode Q3 connects the negative pole of PIN photodiode D1 and one end of regulating resistance R7 by capacitor C 5, and the other end of regulating resistance R7 and the emitter of first crystal triode Q3 and the emitter of the second transistor Q4 are altogether, the positive pole of PIN photodiode D1 connects 5V power supply, signal processing unit comprises DSP decoder module, FPGA system control module, MAC protocol process module and Network Interface Module, the input of described DSP decoder module connects the collector electrode of the second transistor Q4, the output of DSP decoder module connects respectively FPGA system control module and MAC protocol process module, MAC protocol process module interconnection network interface module.
In LED optical communication, it is to make LED meet illumination needs that transmitting terminal drives the main task of modulation circuit, has again very high switching rate to meet the needs of transmission data.LED modulation drive circuit of the present invention comprises the full-wave rectification bridge being comprised of four diodes and RC filter circuit that can incoming transport power supply, strong adaptability, can in wider voltage range, keep efficient, to LED, provide stable operating voltage, make the LED can steady operation, meet lighting requirement; Adopt light modulation to drive chip IC simultaneously, there is the feature of higher switching rate and lower power consumption, met the needs that transmit data; Original binary bit stream, after preliminary treatment and coding, by LED modulation drive circuit driving LED, is carried out intensity modulated to LED, and the signal of telecommunication is modulated to and on LED light source, is converted to optical signal transmission and goes out.
In LED optical communication, the main task of receiving terminal receiving circuit is with minimum additional noise and distortion, recovers via the entrained information of light carrier after wireless optical transmission.Receiving circuit of the present invention comprises PIN photoelectric detector, amplifying circuit and signal processing unit, carrying the LED light signal that transmits data focuses on photoelectric detector, first through photoelectric detector, be converted to the signal of telecommunication, wherein photoelectric detector is selected PIN photoelectric detector, and PIN photoelectric detector has that quantum efficiency is high, highly sensitive, fast response time, feature that noise is little; Then the signal of telecommunication is amplified to processing, amplifying circuit adopts two-stage triode direct coupling type amplifying circuit, reduces to greatest extent distortion; By signal processing unit, amplifying signal is carried out to Digital Signal Processing again, under the control of FPGA system control module, by DSP decoder module, carry out DSP decoding demodulation, decoder module adopts general or special purpose digital signal processing chip, have flexibly, accurately, good reliability, volume is little, cost is low, the feature of high arithmetic speed, the signal that the transmitting terminal recovering by DSP decoder module decoding demodulation sends, then transmit out by MAC protocol process module and Network Interface Module.
It should be pointed out that the above embodiment can make the invention of those skilled in the art's comprehend, but do not limit the present invention in any way creation.Therefore, although this specification and embodiment have been described in detail to the invention,, it will be appreciated by those skilled in the art that still and can modify or be equal to replacement the invention; And all do not depart from technical scheme and the improvement thereof of the spirit and scope of the present invention, it is all encompassed in the middle of the protection range of the invention patent.
Claims (2)
1. the optical communication apparatus based on White-light LED illumination, is characterized in that, comprises transmitting terminal and receiving terminal, and described transmitting terminal comprises the LED modulation drive circuit being connected with LED lamp array, and described receiving terminal comprises LED optical communication receiving circuit;
Described LED modulation drive circuit comprises the full-wave rectification bridge being comprised of four diodes that can incoming transport power supply, the DC voltage output end of the described full-wave rectification bridge storage capacitor C1 that is connected in parallel, the two ends of storage capacitor C1 connect RC filter circuit again, one end of the resistance R 1 of RC filter circuit connects the positive output end of storage capacitor C1, and filter capacitor C2 is connected in parallel between the other end of resistance R 1 and the negative output terminal of storage capacitor C1; The output of RC filter circuit connects power supply pin VBAT and the ground pin GND that light modulation drives chip IC, light modulation drives the switch of chip IC to control the negative pole that pin CTRL connects LED lamp array, light modulation drives the switch pin SW of chip IC to connect the negative pole of a voltage stabilizing didoe D1 and one end of inductance L 1, the other end of inductance L 1 connects the negative pole of LED lamp array and one end of protection capacitor C 4, and the other end anodal and with protecting capacitor C 4 of the positive pole of LED lamp array, voltage stabilizing didoe is all connected the VBAT pin that light modulation drives chip IC; Light modulation drives the reseting pin RSET of chip IC by resistance R 2, to connect the negative output terminal of RC filter circuit;
Described receiving circuit comprises PIN photoelectric detector, amplifying circuit and signal processing unit, described PIN photoelectric detector is PIN photodiode D1, described amplifying circuit comprises first crystal triode Q3 and the second transistor Q4, the collector electrode of first crystal triode Q3 connects the base stage of the second transistor Q4 by capacitor C 6, the collector electrode of first crystal triode Q3 also connects 5V power supply by protective resistance R9, the collector electrode of the second transistor Q4 connects 5V power supply by protective resistance R11, between the collector electrode of first crystal triode Q3 and base stage, there is biasing resistor R8, between the collector electrode of the second transistor Q4 and base stage, there is biasing resistor R10, the base stage of first crystal triode Q3 connects the negative pole of PIN photodiode D1 and one end of regulating resistance R7 by capacitor C 5, and the other end of regulating resistance R7 and the emitter of first crystal triode Q3 and the emitter of the second transistor Q4 are altogether, the positive pole of PIN photodiode D1 connects 5V power supply, described signal processing unit comprises DSP decoder module, FPGA system control module, MAC protocol process module and Network Interface Module, the input of described DSP decoder module connects the collector electrode of the second transistor Q4, the output of DSP decoder module connects respectively FPGA system control module and MAC protocol process module, MAC protocol process module interconnection network interface module.
2. the optical communication apparatus based on White-light LED illumination according to claim 1, it is characterized in that, described LED lamp array is RGB-LED lamp array, and by red, green, blue three-color LED chip package together, the light that they send mixes and obtains white light described RGB-LED lamp array.
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| CN107079548A (en) * | 2014-08-01 | 2017-08-18 | 飞利浦灯具控股公司 | Circuit for driving load |
| CN111256051A (en) * | 2020-01-21 | 2020-06-09 | 厦门普为光电科技有限公司 | Optical communication lamp |
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