CN113541805A - Method for realizing energy-carrying two-way communication based on laser wireless energy transmission system - Google Patents
Method for realizing energy-carrying two-way communication based on laser wireless energy transmission system Download PDFInfo
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- CN113541805A CN113541805A CN202110653020.9A CN202110653020A CN113541805A CN 113541805 A CN113541805 A CN 113541805A CN 202110653020 A CN202110653020 A CN 202110653020A CN 113541805 A CN113541805 A CN 113541805A
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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
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
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- 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
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- 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
- H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
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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
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
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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
- H04B10/60—Receivers
Abstract
The invention discloses a method for realizing energy-carrying bidirectional communication based on a laser wireless energy transmission system, and belongs to the technical field of electric communication. The method breaks through the traditional thinking of laser wireless energy transmission, the continuous laser is discretized into laser pulses, and the discretized pulse laser has more controllable variables compared with the continuous laser in an analog form, so that the method modulates the variables independent of energy transmission in the pulse laser and can realize the fusion of energy and information transmission in a system. In order to realize the energy-carrying two-way communication of the laser wireless energy transmission system, firstly, a method of pulse laser frequency shift keying modulation and inductive current ripple amplitude keying demodulation is provided so as to realize the unidirectional energy-carrying communication of the system; secondly, according to the retro-reflection characteristic of the modulation retro-reflector, an information retrospective modulation and demodulation method based on continuous bias laser is provided so as to realize uplink of data in the system. The energy-carrying two-way communication scheme synchronously realizes stable energy transmission and high-speed communication.
Description
Technical Field
The invention discloses a method for realizing energy-carrying bidirectional communication based on a laser wireless energy transmission system, and belongs to the technical field of electric communication.
Background
Along with the increasing popularization of electronic equipment such as cell-phones, panel computers and smart watches, the power supply problem of equipment also shows gradually, traditional contact power supply has the problem that mobility is poor, more and more equipment possess powerful hardware configuration now, this has also brought higher consumption, under the condition that battery technology does not show the improvement, more and more high hardware consumption has greatly shortened battery life, this just makes the user need carry out once or many times a day charging to mobile electronic equipment, the cable and the distance that traditional contact power supply exists restrict the inconvenience of user greatly under this kind of frequency of charging condition higher. The wireless laser power transmission has the advantages of long transmission distance, good directionality and high power density, and is suitable for remotely charging the mobile electronic equipment which needs to be frequently charged in a non-contact manner.
The structure of the laser wireless energy transmission system is shown in fig. 1, electric energy in a transmitting end, a power grid or an energy storage unit is provided for a laser through a laser power supply, the laser converts the electric energy into laser to be transmitted, the laser is transmitted through the atmosphere and received by a high-concentration photovoltaic cell at a receiving end, the photovoltaic cell converts the laser with high energy density into the electric energy, and the electric energy converted by the photovoltaic cell supplies power to a load or the energy storage unit through the photovoltaic power supply at the receiving end.
When the wireless laser electric energy transmission system supplies power to the mobile electronic equipment, information such as photovoltaic array voltage, load voltage, temperature of the equipment, electric quantity and the like needs to be used as a regulation basis of a laser power supply of an emitting end, so that instruction information needs to be transmitted while power is transmitted. At present, most of wireless laser power transmission systems adopt a traditional radio communication mode, the traditional communication mode is easy to interfere, one more set of equipment is needed, the complexity of the system is improved, the cost is increased, and the flexibility of the system is reduced, so that the application of the power transmission system in certain specific spaces is limited.
The traditional energy-carrying communication method based on the laser wireless power transmission system is mainly realized by carrying out carrier modulation on continuous laser, namely, high-frequency alternating current for representing information is injected into input current of a laser to modulate laser output by the laser, however, the carrier modulation mode easily causes fluctuation of received power and is not beneficial to efficient transmission of energy. In order to stabilize the received power, the decoupling of energy and information is generally achieved by adding a compensation data segment to the injected high frequency current, but this approach sacrifices the data transmission rate.
In conclusion, an energy information fusion mechanism based on laser characteristics is deeply explored, and a method for realizing energy-carrying bidirectional communication based on a laser wireless energy transmission system is provided, so that stable transmission and high-speed communication of energy in the system are realized simultaneously, and the method has important significance and practical value for developing and realizing information and energy integration of the laser wireless electric energy transmission system.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for realizing energy-carrying two-way communication based on a laser wireless energy transmission system, wherein a laser power supply is modulated at a transmitting end to inject frequency loading information of the current of a semiconductor laser, the simultaneous downlink transmission of energy and data is realized by fusing and transmitting energy and information through discretized main laser formed after modulation, the amplitude of the current ripple wave on a photovoltaic power supply inductor is detected at a receiving end to realize the signal demodulation of the transmission of the transmitting end, incident laser beams at the receiving end are subjected to secondary modulation and are transmitted reversely, the uplink transmission of data in the system is realized by discretized retrospectively laser, the invention aims of realizing the stable transmission of energy and high-speed communication based on the laser wireless energy transmission system are realized, the problems that the receiving power fluctuates due to the transmission of information in the traditional carrier debugging mode and the two-way communication scheme based on the laser wireless energy transmission system cannot give consideration to the stable transmission of energy and high-speed communication in the prior two-way communication based on the laser wireless energy transmission system are solved The technical problem is solved.
The invention adopts the following technical scheme for realizing the aim of the invention:
the laser wireless energy transmission system is divided into an emitting end and a receiving end, wherein the emitting end comprises a modulator, a laser power supply and a semiconductor laser, and the receiving end comprises a photovoltaic array, a modulation retro-reflector, a demodulator, a photovoltaic power supply and a load. The energy carrying bidirectional communication method based on the laser wireless energy transmission system comprises two parts: 1) the simultaneous downlink transmission of system energy and data is realized through pulse laser frequency shift keying modulation and inductive current ripple amplitude keying demodulation; 2) and information backtracking modulation and demodulation based on the continuous bias laser, so as to realize uplink of system data.
The pulse laser frequency shift keying modulation specifically refers to: the pulse current input by the laser is frequency-modulated so that the high frequency pulse current represents data "0" and the low frequency pulse current represents data "1". Because the semiconductor laser is a current injection type device, the injection current in different forms has a decisive influence on the laser emitted by the semiconductor laser, the laser pulse frequency emitted by the semiconductor laser is changed along with the change of the injection current frequency, so that the laser outputs corresponding modulated pulse laser, and the fusion transmission of energy and information (namely the simultaneous downlink transmission of energy and data) is realized.
The inductance current ripple amplitude keying demodulation specifically refers to: the modulated pulse laser is captured by the photovoltaic array, and pulse power consistent with the frequency change of the pulse laser is output, and the pulse power enables the magnitude of the current ripple amplitude on the photovoltaic power inductor at the receiving side to change along with the change of the frequency of the pulse power, so that corresponding data of '1' or '0' can be demodulated by detecting the magnitude of the current ripple amplitude on the inductor, namely when the current ripple amplitude is small, the received data is '0', otherwise, the received data is '1'.
The information backtracking modulation and demodulation based on the continuous bias laser specifically refers to the following steps: the idea of Modulating Retro-Reflector (MRR) on the photovoltaic array to secondarily modulate the incident laser beam and reversely emit and transmit is utilized to realize uplink of data in the system. First, the MRR intensity-modulates a portion of the laser light of the main laser beam and reversely transmits, i.e., transmits data "1", the MRR reflects the laser light, and when transmitting data "0", the MRR stops reflecting the laser light. At the transmitting end, after capturing the twice modulated laser traced back from the receiving end, the signal can be demodulated by judging whether the traced back laser exists, that is, the received data is "1" when the optical power is received, and the received data is "0" when the optical power is not received.
The invention has the following advantages by adopting the technical method:
(1) the invention breaks through the traditional thinking of laser wireless energy transmission, and disperses continuous laser into laser pulse, and because the dispersed pulse laser has more controllable variables compared with continuous laser in an analog form, the invention modulates the variables independent of energy transmission in the pulse laser, and does not need to load information in a carrier modulation mode of injecting high-frequency alternating current into the input current of the laser, thereby avoiding the power fluctuation of a receiving end, and realizing the fusion of energy and information transmission in a system and high-efficiency energy transmission.
(2) In the energy and information fusion transmission method provided by the invention, the control variables of the energy and the information are decoupling variables which do not influence each other, and the information is acquired without a compensation data segment decoupling mode corresponding to carrier modulation, so that the stable transmission of the energy is not required to be exchanged by sacrificing the information transmission speed, and the stable transmission of the energy and the bidirectional high-speed transmission of the information can be realized.
(3) The bidirectional communication method provided by the invention can be realized based on the existing laser wireless energy transmission system without adding additional equipment, and the purposes of stable energy transmission and high-speed communication are synchronously realized on the premise of not increasing the complexity of the system and not reducing the flexibility of the system.
Drawings
Fig. 1 is a schematic diagram of a laser wireless power transmission system for implementing bidirectional communication.
Fig. 2 is a waveform diagram of the current injected into the laser during modulation of the transmit side signal.
Fig. 3 is a ripple waveform diagram of the inductor current when the frequency of the photovoltaic array output current is changed.
Fig. 4 is a waveform diagram of laser pulses reflected by MRR back to the emitting end after modulation by an electrical signal.
Detailed Description
The technical scheme of the invention is explained in detail in the following with reference to the attached drawings.
The invention realizes energy-carrying two-way communication based on the laser wireless energy transmission system shown in figure 1, at the transmitting end, an electric network or an energy storage unit injects electric energy into a semiconductor laser through a laser power supply, the semiconductor laser converts the electric energy into laser, and the laser is transmitted to a photovoltaic array on remote electronic equipment through free space. At the receiving end, the photovoltaic array converts the received laser into electric energy, and the electric energy is supplied to the load and the energy storage unit through the photovoltaic power supply. The semiconductor laser is a current injection type device, and the injection current in different forms has decisive influence on the laser emitted by the semiconductor laser. As shown in fig. 1, a control module, a modulator and a photo-detection device are disposed at the transmitting end. The control module is used for receiving data to be transmitted and power information fed back by the receiving end and generating a control instruction according to the power information fed back by the receiving end; the modulator modulates a control command according to data to be transmitted to generate a laser power supply switching tube driving signal so as to switch the frequency of the input current of the semiconductor laser; the photoelectric detection device is used for receiving backtracking laser fed back by the receiving end.
As shown in fig. 1, a demodulator, a control module, a controller and a modulation retro-reflector are deployed at the receiving end. The demodulator is used for analyzing a control instruction from the laser power supply inductive current ripple information; the control module is used for controlling the working mode of the load of the receiving end according to the demodulation information output by the demodulator; the controller is used for capturing signals of the output voltage and the load voltage of the photovoltaic array, analyzing transmitted data from the captured signals and generating load power information; the modulation retro-reflector is used for backtracking load power information to the transmitting end in the form of discrete laser pulses according to transmission data analyzed by the controller.
Next, specific embodiments of the pulse laser frequency shift keying modulation, the inductive current ripple amplitude keying demodulation, and the information traceback modulation and demodulation functions will be explained in detail.
The pulse laser frequency shift keying modulation specifically refers to: a '0' and '1' signal to be transmitted and a feedback laser signal demodulated by a photoelectric detection device are input into a control module at an emitting end, the control module outputs a control signal to a modulator, when the signal input into the control module is '1', the control module outputs a high potential, when the signal input into the control module is '0', the control module outputs a low potential, the high potential triggers the modulator to output a low-frequency driving signal when receiving the control signal '1', the low potential triggers the modulator to output a high-frequency driving signal when receiving the control signal '0', the modulator outputs a high-frequency and low-frequency driving signal to a switching tube of a laser power supply, and the laser power supply correspondingly injects high-frequency and low-frequency pulse current with direct current bias into a semiconductor laser. Since the semiconductor laser is a current injection type device, different types of injection currents have a decisive influence on the laser light emitted by the semiconductor laser, the frequency of the laser light pulse emitted by the semiconductor laser changes with the change of the frequency of the injection current. In this way, information is modulated into laser, so that the fusion transmission of energy and information is realized, namely the simultaneous downlink transmission of energy and data is realized. FIG. 2 shows the pulse current injected into the laser when the "0" and "1" signals are inputtedi LDThe frequency of (a) is varied, wherein,I LDis a dc bias current.
The inductance current ripple amplitude keying demodulation specifically refers to: the modulated pulse laser is captured by the photovoltaic array and converted into pulse current which is input to the photovoltaic power supply, and the high-frequency pulse laser and the low-frequency pulse laser are correspondingly converted into the high-frequency pulse current and the low-frequency pulse current. High-low frequency pulse current is input to a photovoltaic power supply, the inductive current of the photovoltaic power supply is sampled, and the duty ratio can be considered to be unchanged at the moment of switching the laser pulse frequency, so that the size of the inductive current ripple is only related to the charging and discharging frequency of the inductive current ripple. Low frequency, electricityThe charging and discharging time of the inductor is prolonged, and the amplitude of the inductive current ripple is increased; the frequency becomes high, the charging and discharging time of the inductor becomes short, and the ripple amplitude of the inductor current becomes small. The inductance sampling current is input into a demodulator, the amplitude of the inductance current ripple is compared, a low potential characterization signal '0' is output when the amplitude of the inductance current ripple is reduced, and a high potential characterization signal '1' is output when the amplitude of the inductance current ripple is increased, so that the demodulation of a receiving end signal is realized. FIG. 3 shows that the photovoltaic array outputs pulse currents with different frequenciesi pvCurrent ripple on time-varying photovoltaic power supply inductori LWhen the pulse current frequency becomes low, the amplitude of the inductor ripple current becomes large.
The information backtracking modulation and demodulation based on the continuous bias laser specifically refers to the following steps: and the modulation retro-reflector MRR on the photovoltaic array performs secondary modulation on the received partial laser according to information such as photovoltaic array output voltage and load voltage input into the receiving end controller and the like and reflects the partial laser back to the transmitting end. When data "1" is transmitted, the MRR reflects the laser light, and when data "0" is transmitted, the MRR stops reflecting the laser light. At the transmitting end, after capturing the twice modulated laser traced back from the receiving end, the signal can be demodulated by judging whether the traced back laser exists, that is, the received data is "1" when the optical power is received, and the received data is "0" when the optical power is not received. Fig. 4 shows the laser light reflected by the MRR back to the emitting end after modulation by the electrical signal, wherein,P recfor the optical power received by the MRR,P bacfor the optical power reflected back to the emitting end by the MRR, int 0Tot 1The laser modulated by the stage MRR is a weaker laser generated by the bias current,t 1tot 2The laser modulated by the stage MRR is a pulse laser for power transmission.
Claims (5)
1. A method for realizing energy carrying two-way communication based on a laser wireless energy transmission system is characterized in that pulse laser frequency shift keying modulation is carried out on output current of a laser power supply at an emitting end according to data to be transmitted to generate a control instruction loaded with the data to be transmitted, the control instruction is transmitted to a receiving end through biased pulse laser output by a semiconductor laser, inductive current of a photovoltaic power supply is captured after the biased pulse laser irradiates a photovoltaic array at the receiving end, inductive current ripple amplitude keying demodulation is carried out on the inductive current of the photovoltaic power supply to obtain the control instruction, information retrospective modulation demodulation is carried out on part of discrete pulse laser received by the photovoltaic array at the receiving end to obtain transmitted data, and load power information is fed back to the emitting end in the form of discrete laser according to the transmitted data.
2. The method for realizing energy-carrying bidirectional communication based on the laser wireless energy transmission system according to claim 1, wherein the specific method for performing pulse laser frequency shift keying modulation on the output current of the laser power supply at the transmitting end according to the data to be transmitted comprises the following steps: the frequency of a driving signal of a switching tube in the laser power supply is switched according to the data to be transmitted, when the data to be transmitted is data '0' representing high-frequency pulse current, the driving signal of the switching tube in the laser power supply is switched to be the high-frequency driving signal, and when the data to be transmitted is data '1' representing low-frequency pulse current, the driving signal of the switching tube in the laser power supply is switched to be the low-frequency driving signal.
3. The method for realizing energy-carrying bidirectional communication based on the laser wireless energy transmission system according to claim 1, wherein the specific method for performing the amplitude keying demodulation of the inductor current ripple of the inductor current of the photovoltaic power supply comprises: and demodulating data '1' representing low-frequency pulse current when the ripple amplitude of the inductive current of the photovoltaic power supply is increased, and demodulating data '0' representing high-frequency pulse current when the ripple amplitude of the inductive current of the photovoltaic power supply is decreased.
4. The method for realizing energy-carrying bidirectional communication based on the laser wireless energy transmission system according to claim 1, wherein the specific method for feeding back the load power information to the transmitting end in the form of discrete laser according to the transmitted data comprises: when the transmission data is 1, the laser signal containing the load power information is reflected to the transmitting end, and when the transmission data is 0, the laser signal is stopped to be reflected to the transmitting end.
5. The apparatus for implementing the method of claim 1 comprising:
the transmitting terminal control module is used for receiving data to be transmitted and load power information fed back by the receiving terminal, outputting a high level when the data to be transmitted is data '1' representing low-frequency pulse current, and outputting a low level when the data to be transmitted is data '0' representing high-frequency pulse current;
the pulse laser frequency shift keying modulator receives an output signal of the transmitting terminal control module, outputs a low-frequency driving signal to a switching tube in the laser power supply when receiving a high level, and outputs a high-frequency driving signal to the switching tube in the laser power supply when receiving a low level;
the photoelectric detector outputs load power information fed back by the receiving end to the transmitting end control module when receiving the retrospective laser reflected by the modulation retro-reflector;
the inductive current ripple amplitude keying demodulator is used for receiving a collected signal of the inductive current of the photovoltaic power supply, comparing the amplitude of the photovoltaic inductive current in a continuous sampling period, outputting data '1' representing low-frequency pulse current when the amplitude of the inductive current of the photovoltaic power supply is increased, outputting data '0' representing high-frequency pulse current when the amplitude of the inductive current of the photovoltaic power supply is decreased, and controlling the working mode of a load at a receiving end by using the data '1' representing the low-frequency pulse current and the data '0' representing the high-frequency pulse current;
the receiving end controller receives the acquisition signals of the photovoltaic array output voltage and the load voltage of the receiving end, outputs a control instruction of reflecting the laser signal to the modulation retro-reflector when data '1' is transmitted, and outputs a control instruction of stopping reflecting the laser signal to the modulation retro-reflector when data '0' is transmitted; and a process for the preparation of a coating,
and the modulation retro-reflector receives the control command output by the receiving end controller, outputs the retrospective laser to the transmitting end when receiving the control command of the reflected laser signal, and stops outputting the retrospective laser when receiving the control command of the laser signal stopping reflection.
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