LU102101B1 - Visible light communication and energy collection system - Google Patents

Visible light communication and energy collection system Download PDF

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Publication number
LU102101B1
LU102101B1 LU102101A LU102101A LU102101B1 LU 102101 B1 LU102101 B1 LU 102101B1 LU 102101 A LU102101 A LU 102101A LU 102101 A LU102101 A LU 102101A LU 102101 B1 LU102101 B1 LU 102101B1
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LU
Luxembourg
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module
energy
signal
resistor
capacitor
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LU102101A
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German (de)
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Hongling Liu
Liang Liang
Zhongwen Wu
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Xuzhou Inst Technology
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
    • H04B10/806—Arrangements for feeding power
    • H04B10/807—Optical power feeding, i.e. transmitting power using an optical signal
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • H04B10/114—Indoor or close-range type systems
    • H04B10/116—Visible light communication
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/001—Energy harvesting or scavenging
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/30—Circuit arrangements or systems for wireless supply or distribution of electric power using light, e.g. lasers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Optical Communication System (AREA)

Abstract

The present invention discloses a visible light communication and energy collection system, and relates to a visible light communication and energy collection field, wherein the system includes a transmitting device and a receiving device, the transmitting device includes an FPGA modulation module, a pre-equalization module, and an LED array driving module; the receiving device includes an information receiving module and an energy receiving module in a parallel relationship, wherein the information receiving module includes a photoelectric detector, a post equalization module, an FPGA demodulation module that are sequentially connected, and the energy receiving module includes a silicon photoelectric battery, an energy collection module and an energy management module that are sequentially connected, the equalization circuits designed at both transmitting and receiving terminals of the present invention have a simple structure, and can prominently increase a modulation bandwidth of the receiving and transmitting devices while reducing system complexity and design cost.

Description

Description
VISIBLE LIGHT COMMUNICATION AND ENERGY COLLECTION SYSTEM Technical Field The present invention relates to a visible light communication field, and particularly, relates to a visible light communication and energy collection system. Background Currently, since wireless communication technology is limited by carrier frequency and physical bandwidth, people are urgent to seek for a new wireless communication technology. In order to satisfy requirements of further wireless communication, optical communication technology with faster transmission rates and the higher bandwidths emerges as the time requires. As an additional supplementary communication method for wireless transfer in future, Visible Light Communication (VLC) is a wireless communication technology that may take into account both "lighting and communication”, and has many advantages such as abundant spectrum resources, low power consumption and the like.
VLC adopts Light-Emitting Diode (LED) as a light source, which has many advantages such as high brightness, low power consumption, long life and so on, and may load electric signals on visible light for transferring through modulation technology at the same time. However, a narrow band characteristic of LED itself affects a modulation bandwidth of a VLC system. In order to resolve this problem, hardware equalization technology may be adopted. As an effective method of improving a bandwidth of the VLC system, hardware equalization technology has problems of complexity and too high cost during a designing process, for example: a "T" type equalizer and a multi-resonance equalizer also have problems of complex topology and low flexibility, and these problems severely limit the development of VLC.
In traditional wireless communication, it is general to adopt energy collection technology to convert weak radio-frequency (RF) signal energy into electrical energy, and supply energy to small base stations and relay nodes to implement energy reuse of the wireless communication system. The develop concept of VLC is "green and energy-saving". In the VLC system, in addition to owing abundant spectrum resources, the LED itself is a kind of energy source, and light energy emitted by the LED is converted into electrical energy to supply energy to communication apparatuses, so that lighting, communication and energy reuse may be implemented. It is quite necessary to design a new communication system that takes into account "lighting, communication, and energy reuse" to fully embody reflect a way of green communication. Summary Purposes of the present invention are to overcome disadvantages of the above prior art, put forward a visible light communication and energy collection system, and aim to resolve a problem of lower system bandwidth caused by device mismatch and nonlinearity, greatly improve system modulation bandwidths and transmission rates, reduce costs of system design and manufacturing complexity and facilitate promotion of visible light communication; meanwhile, a designed energy collection device may fully convert received light energy into electrical energy to supply energy for system operation, and the entire communication system takes into account triple energy supply of "lighting, communication, energy reuse" and fully embodies "green, energy-saving and recycling" communication ideas.
In order to resolve the above problems, the present invention adopts a following technical solution: a visible light communication and energy collection system, including a system transmitting device and a system receiving device; the visible light communication transmitting device being used to transmit a modulation signal, and including a field-programmable gate array (FPGA) modulation module, a digital-to-analog conversion module, a pre-equalization module, an LED driving module and an LED light source array that are sequentially connected; and the receiving device being used to receive a signal and light energy transferred by the transmitting device, and including a communication receiving module and an energy receiving module in a parallel relationship.
The advantageous effect thereof is that reception of information and reception of energy are simultaneously performed in two ways in parallel without interference.
The communication receiving module is used to receive a modulation signal loaded on a visible light that is transmitted by a transmitting module, and includes a PIN photoelectric detector array, a photoelectric conversion module, a post equalization module, an analog-to-digital conversion module and an FPGA demodulation module that are sequentially connected; and the energy receiving module is used to receive signal light and ambient light energy that are transmitted by a transmitting module to implement system energy self-supply, and includes a silicon photovoltaic battery pack, an energy collection module, an energy management module, and an energy storage battery that are sequentially connected.
The FPGA modulation module is used to modulate a signal transmitted from an information source, and transmits the modulated signal to the digital-to-analog conversion module; the digital-to-analog conversion module is used to convert a digital signal output by the FPGA modulation module into an analog signal and output the analog signal to the equalization circuit; the pre-equalization module is used to perform equalization process on the input analog signal and transfer it to the LED driving module; and the LED driving module is used to drive the LED light source array to be continuously ON while performing power amplification on an output electrical signal of the equalization circuit, and output the light signal loaded with modulation information.
The PIN photoelectric detector array is used to receive a light signal transmitted by the visible light communication transmitting module; the photoelectric conversion module is used to convert the received light signal into an electrical signal, and amplify and output the electrical signal to the post equalization module; the post equalization module is used to perform equalization process on the received analog electrical signal and transfer it to the analog-to-digital conversion module; the analog-to-digital conversion module is used to convert the equalized analog signal into a digital signal, and transfer it to the FPGA demodulation module; and the FPGA demodulation module is used to demodulate the received modulated signal.
The silicon photovoltaic battery pack is used to receive emitting light signals and ambient light signals and convert the collected light signals into electric signals; the energy collection module is used for maximum power point tracking and boost conversion of the silicon photovoltaic battery pack, and to transfer the boosted electric signal to the energy management module; the energy management module is used to manage all the collected energy to implement dynamic display of electric quantity of the energy storage battery and system power supply; and the energy storage battery is used to store the energy of the system.
As a further preferable solution of a visible light communication and energy collection system of the present invention, the pre-equalization circuit includes a first resistor, a first capacitor, a second resistor, a third resistor, a third capacitor and an operational amplifier, an end of the first resistor is connected with an end of the first capacitor and is grounded, and the other end of the first resistor, the other end of the first capacitor and an end of the second resistor are connected with a negative electrode input terminal of the operational amplifier, respectively; a positive electrode input terminal of the operational amplifier is connected with a signal input Vin terminal, an output terminal of the operational amplifier is connected with the other end of the second resistor and an end of the third resistor, respectively, the other end of the third resistor is connected with an end of the third capacitor and a signal output Vou terminal, respectively, and the other end of the third capacitor is grounded.
The advantageous effects thereof lie in that the pre-equalization circuit improves the signal transmitting power, effectively reduces the influence of non-linearity of the LED and other devices on the modulation bandwidth, and improves the modulation signal bandwidth at the transmitting end while having advantages of a simple Topology structure and a low manufacturing cost.
As a preferable solution of a visible light communication and energy collection system of the present invention, the post equalization circuit includes an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor and an operational amplifier, a photoelectric conversion signal Vi is input from a negative electrode, the eighth resistor and the sixth capacitor are connected with a negative electrode input terminal of the operational amplifier after they are connected in series, and the ninth resistor and the seventh capacitor are connected in series, an end is connected with the negative electrode input terminal of the operational amplifier and the other end is connected with an output terminal of the operational amplifier; the tenth resistor and the tenth capacitor are connected in series, an end is connected with the output terminal of the operational amplifier, and the other end is a signal output terminal Vo; a positive electrode input terminal of the operational amplifier is connected with a ground; and an end of the eleventh resistor is connected with the ground, and the other end is connected with the signal output terminal Vo.
The advantageous effects thereof lie in that the post equalization circuit may improve the amplitude of the received signal, reduce the phase deflection of the signal,
filter out clutter of the received signal, improve the system bandwidth, and also have advantages of a simple Topology structure and a low manufacturing cost.
As a further preferable solution of a visible light communication and energy collection system of the present invention, the energy collection module includes a maximum power point tracking circuit based on BQ25504 chip and a DC/DC voltage boosting circuit based on MAX669 chip; the maximum power point tracking circuit based on BQ25504 chip is used to collect weak energy of the signal light and ambient light while keeping an output voltage of the silicon photoelectric battery stable; and the DC/DC voltage boosting circuit based on MAX669 chip is used to amplify an output electrical signal of the maximum power point tracking circuit based on BQ25504 chip, and make the output voltage meet system power supply requirements.
The advantageous effects thereof lie in that the module does not affect information receiving while keeping the output voltage of the silicon photoelectric battery stable, increasing energy output maximum power and improving energy collection efficiency.
As a further preferable solution of a visible light communication and energy collection system of the present invention, the energy management module includes a charging management circuit based on ZS6366 chip, a peripheral circuit and the like.
The advantageous effects thereof lie in being capable of dynamically monitoring electric quantity of the energy storage battery, making the system obtain the higher and more stable output current and initiatively adjust energy distribution according to the load and battery energy quantity, and protecting safety of the system power supply.
As a further preferable solution of a visible light communication and energy collection system of the present invention, the FPGA modulation module and the FPGA demodulation module include FPGA chips, and power supply management modules,
clock circuits, reset circuits, and USB-to-serial ports that are connected with the FPGA chips, respectively; the power supply management module is used to supply electric energy required by the FPGA modulation module; the reset circuit is used to clear up problems occurring in the FPGA modulation and demodulation processes and restore an initial state of the FPGA chip; the clock circuit includes a 60M crystal oscillator for providing a frequency that satisfies the transmitted signal; and the USB-to-serial port is used to implement communication conversion of a computer with the FPGA modulation module.
The advantageous effects lie in that the FPGA modulation module and the FPGA demodulation module may openly compile modulation and demodulation signals, adaptively adjust methods of modulating and demodulating signals according to system requirements, have fast calculation speed, and improve signal transmission efficiency.
As a further preferable solution of a visible light communication and energy collection system of the present invention, a model of a chip of the operational amplifier is OPA690.
The present invention has following advantages: (1) the present invention designs a pre-equalization circuit and a post equalization circuit, which may effectively reduce the influence that the non-linearity of devices causes deformation of a waveform of a signal while normalizing and filtering a waveform of the received analog signal, and effectively increase the system modulation bandwidth.
(2) Adopting the pre-equalization circuit formed by combing an operational amplifier and a triode and the post equalization circuit consisting of an operational amplifier and a passive device also reduces complexity and manufacturing cost of the circuit while improving the system modulation bandwidth.
(3) The system receiving end adopts a manner of energy receiving and information receiving in parallel, which effectively avoids interference between signal transferring and energy transferring while improving transmission rate and energy collection efficiency.
(4) The entire system implements "lighting, communication and energy reuse"; and the system modulation bandwidth is increased, the device cost is reduced, the device complexity is reduced, and a "green, energy-saving and recycling" communication method is fully reflected.
Brief Description of the Drawings FIG. 1 is a schematic diagram of an overall structure of a system of the present invention; FIG. 2 is a schematic diagram of a general structure of an FPGA modulation module and demodulation module of the present invention; FIG. 3 is a principle diagram of a pre-equalization circuit of the present invention; FIG. 4 is a principle diagram of a post equalization circuit of the present invention; FIG. 5 is a curve of an amplitude-frequency characteristic of a post equalization circuit of the present invention; FIG. 6 is a schematic diagram of a structure of an energy collection module of the present invention; FIG. 7 is a maximum power point tracking circuit based on BQ25504 chip of the present invention; FIG. 8 is a schematic diagram of a structure of an energy management module of the present invention; FIG. 9 is a comparison chart of bandwidth changes before and after an equalization circuit is added of the present invention; and FIG. 10 is a curve diagram of an output voltage of an energy receiving terminal changing as illumination of the invention.
Detailed Description of the Embodiments The technical solution of the present invention is further illustrated in detail in conjunction with the drawings below so that the features of the present invention are more easily understood by those skilled in the art, thereby making more clear and explicit definition on the scope for protection of the present invention.
As shown in FIG. 1, schematic diagram of an overall structure of a system of the present invention is provided, including: a transmitting device and a receiving device.
The transmitting device includes: a field-programmable gate array (FPGA) modulation module, a digital-to-analog conversion module, a pre-equalization module, an LED driving module and an LED light source array that are sequentially connected. FIG. 2 provides a schematic diagram of a general structure of an FPGA modulation module and demodulation module of the present invention, wherein the FPGA modulation module includes: a power supply management module, a clock circuit, a reset circuit, and a USB-to-serial port. The FPGA modulation module modulates a received signal of an information source, and transmits it to the digital-to-analog conversion module. The power supply management module is used to supply power to the FPGA modulation module, and has functions of a work indicating lamp and a switch; the reset circuit is used to clear up problems occurring in an FPGA modulation process and restore an initial state of an FPGA chip; the clock circuit includes a 60M crystal oscillator which can satisfy a frequency requirement for transmitting a signal; the USB-to-serial port is used to implement communication conversion of a computer with the FPGA modulation module; and the digital-to-analog conversion module is used to convert a digital signal output by the FPGA modulation module into an analog signal and output it to the pre-equalization circuit.
The pre-equalization circuit performs equalization process on the input signal and outputs it to the LED driving circuit. Specifically, FIG. 3 is a principle diagram of the pre-equalization circuit, and the pre-equalization circuit includes a first resistor Rı, a first capacitor C;, a second resistor Ry, a third resistor R3, a third capacitor C3 and an operational amplifier, an end of the first resistor is connected with an end of the first capacitor and is grounded, and the other end of the first resistor, the other end of the first capacitor and an end of the second resistor are connected with a negative electrode input terminal of the operational amplifier, respectively; and a positive electrode input terminal of the operational amplifier is connected with an AC signal input Vin terminal, an output terminal of the operational amplifier is connected with the other end of the second resistor and an end of the third resistor, respectively, the other end of the third resistor is connected with an end of the third capacitor and an AC signal output Vou terminal, respectively, and the other end of the third capacitor is grounded, wherein a model of the operational amplifier is OPA690. As shown in FIG. 3, a transfer function of the equalization circuit can be expressed as: H, (jo) =1+—2 (+ ]a+ 50/0) R//—— 1 j@C, (1 wherein, @ =1/(R //R,)C,, w=2xf , fis a transmitting frequency, and the equation (1) is performed a modulo calculation to obtain: |H, (jo) (ee ear 1 (2) When & increases, J1+a*/ @ also increases, while OPA690 can obtain a high gain of 1.6GHz, thus, it can be obtained that a gain effect of the equalizer is very prominent.
In the present embodiment, the first resistor R;=806Q, the first capacitor C=0.luF, the second resistor R;=806Q), the third capacitor R3=100Q2, and the third capacitor C3=10pF. The values of the above parameters are related to an overall effect of the pre-equalization circuit, which can make the pre-equalization circuit have better linearity and impedance matching characteristic.
The receiving device is used to receive a signal and light energy transferred by the transmitting device, and includes a communication receiving module and an energy receiving module in a parallel relationship. The communication receiving module is used to receive a modulation signal loaded on a visible light that is transmitted by a transmitting module, and includes a PIN photoelectric detector array, a photoelectric conversion module, a post equalization module, an analog-to-digital conversion module and an FPGA demodulation module that are sequentially connected; and the energy receiving module is used to receive signal light and ambient light energy transmitted by | the transmitting module to implement system energy self-supply, and includes a silicon photovoltaic battery pack, an energy collection module, an energy management module, and an energy storage battery that are sequentially connected. Since the communication receiving module and the energy receiving module adopt a parallel relationship, the brought advantages are that signal receiving and energy receiving do not interfere with each other, and maximizing information receiving rate and energy collection efficiency.
The pose equalization circuit further performs amplification and filter processes on an output electrical signal of the photoelectric conversion circuit, and transfers the equalized electrical signal to the FPGA demodulation module. Specifically speaking, as what is shown by the principle diagram of the post equalization circuit of FIG. 4, the circuit includes: an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor and an operational amplifier, a photoelectric conversion signal Vi is input from a negative electrode, the eighth resistor and the sixth capacitor are connected with a negative electrode input terminal of the operational amplifier after they are connected in series, and the ninth resistor and the seventh capacitor are connected in series, an end is connected with the negative electrode input terminal of the operational amplifier and the other end is connected with an output terminal of the operational amplifier; the tenth resistor and the tenth capacitor are connected in series, an end is connected with the output terminal of the operational amplifier, and the other end is a signal output terminal Vo; a positive electrode input terminal of the operational amplifier is connected with a ground; and an end of the eleventh resistor is connected with the ground, and the other end is connected with the signal output terminal Vo.
In the present embodiment, the eighth resistor Rs=50€2, the ninth resistor Ry=2K Q, the sixth capacitor Cs=0.1pF, the eighth capacitor and the ninth capacitor Cs=Cy=100nF, the tenth resistor R;p=50Q. The values of the above parameters are related to an overall effect of the post equalization circuit, which can make the post equalization circuit obtain higher bandwidth gain, such as a curve of an amplitude-frequency characteristic of the post equalization circuit as shown in FIG. 5.
The energy collection module is used to collect energy from signal light and energy from ambient light. Specifically speaking, a schematic diagram of a structure of an energy collection module as shown in FIG. 6 includes a maximum power point tracking circuit based on BQ25504 chip and a DC/DC voltage boosting circuit based on MAX669 chip. Regarding characteristics of lower power consumption and low energy collection, a maximum power point is programmed mainly by configuring resistance of external resistors R_OC1 and R_OC2, and an output power is maintained by an external capacitor. Regarding a characteristic of high conversion power of the MAX669 chip, parameters of external elements are reasonably configured to stably collect and boost the output electrical signal of the maximum power point tracking circuit to a required value, so that the output voltage is stably output at 5V. In the present embodiment, the external resistors R_OC1=15.6M©, and R_0C2=4.4MQ; the values are related to the required output voltage value, which can provide a stable input value to the boosting circuit and ensure that the boosting circuit stably outputs at 5V, such as a principle diagram of the maximum power point tracking circuit based on BQ25504 chip as shown in FIG. 7.
The energy management module is used to dynamically manage the input and output of the battery and protect safety of system power supply. Specifically speaking, the schematic diagram of a structure of the energy management module as shown in FIG. 8 includes a chip ZS6366, a reset circuit, an LED display and an energy storage battery. The ZS6366 chip can implement charging management, circuit protection and electric quantity display by reasonably configuring a peripheral circuit. The reset circuit is used to automatically reset a protection circuit when a current or a voltage is overloaded. The LED display includes a lamp array consisting of four LEDs, and is used to display a remaining electric quantity of the energy storage battery. The energy storage battery is used for energy storage and external energy supply.
In addition, the present invention is tested, and the test is divided into a system frequency response test and an output voltage test. (1) The system frequency response test, the circuit signal input of the transmitting end is connected with a signal generator, the circuit signal output of the receiving end is connected with an oscilloscope, and the power is on after checking that no problem exists in the connection.
Subsequently, an output signal of the signal generator is adjusted as a sinusoidal signal having a peak value of 1V and a frequency of 100KHz.
Then, a frequency of the transmitted signal is continuously increased, and is increased by 200KHz each time, and a peak value of an oscilloscope signal is observed and recorded.
As shown in FIG. 9, the system bandwidth is prominently increased after an equalization circuit is added. (2) The output voltage test, positions of the LED lamp and the energy collection circuit are fixed, and an output terminal of the boosting circuit is connected with a multimeter; subsequently, the apparatus is powered on to make the LED keep continuously On, an illumination and an output voltage value of a position of a solar battery are recorded; then, a distance between a solar battery plate and the LED lamp is increased by a step length of 10cm, and the illumination value and the output voltage value are recorded.
As shown in FIG. 10, as the illumination of the surrounding ambient light continuously changes, the output voltage value of the energy receiving terminal is always stabilized at 4.5V.
The models of the apparatuses used in the test are as follows: the information source adopts a signal generator with a model of Tektronix AFG3102, and a model of the oscilloscope is Agilent Technologies TDS1002B.

Claims (10)

Claims What is claimed is: |
1. A visible light communication and energy collection system, comprising: a system transmitting device, which is used to transmit a modulation signal, and comprises a field-programmable gate array (FPGA) modulation module, a digital-to-analog conversion module, a pre-equalization module, an LED driving module and an LED light source array that are sequentially connected; and | a system receiving device, which is used to receive light signal and light energy simultaneously, and comprises an information receiving module and an energy receiving module in a parallel relationship; the information receiving module used to receive a modulation signal loaded on a visible light that is transmitted by a system transmitting device, and comprising: a PIN photoelectric detector array, a photoelectric conversion module, a post equalization module, an analog-to-digital conversion module and an FPGA demodulation module that are sequentially connected; and the energy receiving module used to receive energy of signal light and ambient light transmitted by the transmitting module and store and allocate the collected energy to implement system energy self-supply, and comprising: a silicon photovoltaic battery pack, an energy collection module, an energy management module, and an energy storage battery that are sequentially connected.
2. The visible light communication and energy collection system of claim !, which is characterized in that the FPGA modulation module is used to modulate a signal transmitted from an information source, and transmit the modulated signal to the digital-to-analog conversion module: the digital-to-analog conversion module is used to convert a digital signal output by the FPGA modulation module into an analog signal and output it to an equalization circuit; the pre-equalization module is used to perform equalization process on the input analog signal and transfer it to the LED driving module; and the LED driving module is used to drive the LED light source array to be continuously ON while performing power amplification on an electrical signal output by the equalization circuit, and output a light signal loaded with modulation information.
3. The visible light communication and energy collection system of claim 1, which | is characterized in that the PIN photoelectric detector array is used to receive a light signal transmitted by a visible light communication transmitting module; the photoelectric conversion module is used to convert the received light signal into an electrical signal, and amplify and output the electrical signal to the post equalization module at the same time; the post equalization module is used to perform equalization process on the received analog electrical signal and transfer it to the analog-to-digital conversion module; the analog-to-digital conversion module is used to convert the equalized analog signal into a digital signal, and transfer it to the FPGA demodulation module; and the FPGA demodulation module is used to demodulate the received modulated signal.
4. The visible light communication and energy collection system of claim 1, which is characterized in that the silicon photovoltaic battery pack is used to receive emitting light signals and ambient light signals, and convert the collected light signals into electric signals; the energy collection module is used for maximum power point tracking and boost conversion of the silicon photovoltaic battery pack, and to transfer the boosted electrical signal to the energy management module; the energy management module is used to manage all the collected energy to implement dynamic display of electric quantity of the energy storage battery and system power supply; and the energy storage battery is used to store the energy of the system.
5. The visible light communication and energy collection system of claim 1, which is characterized in that the pre-equalization circuit comprises a first resistor, a first capacitor, a second resistor, a third resistor, a third capacitor and an operational amplifier, an end of the first resistor is connected with an end of the first capacitor and is grounded, and the other end of the first resistor, the other end of the first capacitor and an end of the second resistor are connected with a negative electrode input terminal of the operational amplifier, respectively; and a positive electrode input terminal of the operational amplifier is connected with a signal input Vin terminal, an output terminal of the operational amplifier is connected with the other end of the second resistor and an end of the third resistor, respectively, the other end of the third resistor is connected with an end of the third capacitor and a signal output Vou terminal, respectively, and the other end of the third capacitor is grounded.
6. The visible light communication and energy collection system of claim 1, which is characterized in that the post equalization circuit comprises an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor and an operational amplifier, a photoelectric conversion signal Vi is input from a negative electrode, the eighth resistor and the sixth capacitor are connected with a negative electrode input terminal of the operational amplifier after they are connected in series, and the ninth resistor and the seventh capacitor are connected in series, an end is connected with the negative electrode input terminal of the operational amplifier and the other end is connected with an output terminal of the operational amplifier; the tenth resistor and the tenth capacitor are connected in series, an end is connected with the output terminal of the operational amplifier, and the other end is a signal output terminal Vo; a positive electrode input terminal of the operational amplifier is connected with a ground; and an end of the eleventh resistor is connected with the ground, and the other end is connected with the signal output terminal Vo.
1. The visible light communication and energy collection system of claim 1, which is characterized in that the energy collection module comprises a maximum power point tracking circuit based on BQ25504 chip and a DC/DC voltage boosting circuit based on MAX669 chip; the maximum power point tracking circuit based on BQ25504 chip is used to collect weak energy of the signal light and ambient light while keeping an output voltage of the silicon photoelectric battery stable; and the DC/DC voltage boosting circuit based on MAX669 chip is used to amplify an output electrical signal of the maximum power point tracking circuit based on BQ25504 chip, and make the output voltage meet system power supply requirements.
8. The visible light communication and energy collection system of claim 1, which is characterized in that the energy management module comprises a charging management circuit based on ZS6366 chip comprises a charging management circuit, a clock circuit and the like; and the charging management circuit based on ZS6366 chip is used to dynamically monitor electric quantity of the energy storage battery, and make the system obtain higher and more stable output current while protecting charging and discharging safety of the battery.
9. The visible light communication and energy collection system of claim 1, which is characterized in that the FPGA modulation module and the FPGA demodulation module include FPGA chips, and power supply management modules, clock circuits, reset circuits, and USB-to-serial ports that are connected with the FPGA chips, respectively; the power supply management module is used to supply electric energy required by the FPGA modulation module; the reset circuit is used to clear up problems occurring in the FPGA modulation and demodulation processes and restore an initial state of the FPGA chip; the clock circuit comprises a 60M crystal oscillator for providing a frequency that satisfies the transmitted signal ; and the USB-to-serial port is used to implement communication conversion of a computer with the FPGA modulation module.
10. The visible light communication and energy collection system of claims 5 and 6, which is characterized in that a model of a chip of the operational amplifier is OPA690.
LU102101A 2020-05-22 2020-09-30 Visible light communication and energy collection system LU102101B1 (en)

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CN112367119A (en) * 2020-10-27 2021-02-12 中国科学院半导体研究所 Visible light self-powered communication system and communication method based on same
CN112615672A (en) * 2020-12-15 2021-04-06 华中科技大学 SLIPT-based hybrid VLC/RF cooperative communication system and method
CN113949452B (en) * 2021-08-26 2023-06-27 杭州航天电子技术有限公司 Energy and data simultaneous transmission wireless device based on visible light
CN115941040B (en) * 2023-02-27 2023-06-06 南昌大学 Visible light energy-carrying communication circuit and device based on photovoltaic device
CN117997427A (en) * 2024-04-03 2024-05-07 苏州大学 Information and energy decoupling circuit and visible light information and energy simultaneous transmission system

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CN206835098U (en) * 2017-05-12 2018-01-02 中国矿业大学 A kind of visible light communication dispensing device based on hardware equilibrium with collection of energy
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