A far-field wireless charging method and charging system based on green energy

Abstract

The present invention relates to a far-field wireless charging method and charging system based on green energy. The charging method comprises: obtaining the types of multiple first terminal devices; determining the priority of each first terminal device according to the types of the multiple first terminal devices; determining the charging sequence of multiple first terminal devices within the same priority according to the charging time required for each first terminal device; determining the working time of the first terminal device for each first terminal device; obtaining the waiting charging time of the first terminal device; judging whether the working time of the first terminal device is less than the waiting charging time; and charging each first terminal device in turn according to the priority of each terminal device and based on the charging sequence. The present invention can improve the efficiency of far-field wireless charging and can provide convenient wireless charging for a wide range of IoT terminal devices.

Description

Technical Field

[0001] The present invention relates to the field of wireless charging, and in particular to a far-field wireless charging method and a charging system based on green energy. Background Art

[0002] With the rapid development of modern communication technology, the Internet of Things has gradually entered people's lives. Common Internet of Things applications include: smart sensors, smart bracelets and watches, direct communication between machines, smart homes, smart cities, health care, equipment management, environmental monitoring, security transportation, etc. The Ministry of Industry and Information Technology clearly pointed out in the "Guiding Opinions of the Ministry of Industry and Information Technology on Accelerating the Cultivation of New Models and New Business Forms of Shared Manufacturing and Promoting the High-Quality Development of Manufacturing" that "promote the construction of new infrastructure, strengthen the construction of new infrastructure such as 5G, artificial intelligence, industrial Internet, and Internet of Things, expand the coverage of high-speed, large-capacity, and low-latency networks, and encourage manufacturing enterprises to achieve the interconnection of people, machines, and things through intranet transformation and upgrading, and provide information network support for shared manufacturing", which has brought unprecedented opportunities for the development and application of the Internet of Things. With the implementation and deployment of the Internet of Things worldwide, existing research data shows that it is expected that in 2025, the total number of global Internet of Things terminal devices will reach 75.44 billion, and the total annual power consumption will reach 45TWh. If converted to the basic electricity price of 0.478 yuan / KWh for Beijing residents, 45×10^9KWh of electricity is equivalent to an electricity bill of up to 21.51 billion yuan. To generate 45×10^9KWh of electricity, 5.53 million tons of standard coal must be burned, and each ton of standard coal burned will release 2.493 tons of carbon dioxide, 0.075 tons of sulfide, and other nitrogen oxides. The huge energy consumption generated by IoT terminal devices not only leads to high electricity bills and consumes a lot of energy, but also causes environmental pollution and climate change. It can be seen that adhering to the concept of scientific and sustainable development, promoting environmental protection and energy conservation in the field of modern communications, and using green energy to provide electricity for IoT terminal devices highlights its importance.

[0003] From the perspective of green energy (also known as clean energy, green renewable energy), my country has abundant green energy such as solar energy and wind energy. Especially in high altitude and low latitude areas, using energy base stations to perform far-field wireless charging of IoT terminal devices can not only solve energy and cost problems, but also be beneficial to environmental protection and convenient charging. Traditionally, there are three ways for terminal communication equipment to obtain power: replacing batteries, wired charging, and near-field wireless charging. In the scenario of large-scale deployment of IoT wireless nodes, large-scale battery replacement will result in a lot of manpower, material resources, and time costs, and even cause safety hazards (in difficult to reach or dangerous areas). In the wired charging method, the terminal device must remain connected to the charging cable when charging, and stay in a fixed position for a period of time to obtain power. Therefore, the terminal device cannot move or leave when charging; the "last section of the charging cable" prevents wireless communication devices from achieving their ultimate "wirelessness". In recent years, mobile phones and charging pads that can be "wirelessly charged" have appeared on the market. Some companies have also launched mobile phones that can charge each other, that is, "near-field wireless charging" is achieved through electromagnetic coupling technology, but its actual charging operation is similar to wired charging. The terminal device cannot leave the charging pad or move when charging. In far-field wireless charging, the energy base station can send radio waves (radio frequency, RF) to the surrounding IoT terminal devices that are far away, and transmit energy to the terminal device in the form of electromagnetic waves, so that it can obtain electrical energy. This charging method can conveniently provide energy for the widely existing IoT terminal devices and maintain the mobility and wirelessness of wireless terminal devices. Using green energy as the energy source of the energy base station can effectively use green energy to perform green far-field wireless charging for IoT terminal devices at a certain distance around; this wireless charging method can solve many of the above problems at the same time.

[0004] The shortcomings of existing research are mainly: in terms of far-field wireless charging, there is a lack of terminal equipment design that supports the simultaneous reception of energy and transmission of information, resulting in low wireless charging efficiency; in terms of multiple radio waves providing wireless charging at the same time, there is a lack of design that supports the reasonable adjustment of multiple radio waves to obtain a "constructive" charging effect. Summary of the invention

[0005] The purpose of the present invention is to provide a far-field wireless charging method and a charging system based on green energy to improve the efficiency of far-field wireless charging.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] A far-field wireless charging method based on green energy, the far-field wireless charging method performs wireless charging based on the above-mentioned far-field wireless charging system, and the far-field wireless charging method comprises:

[0008] Acquire the types of multiple first terminal devices; the first terminal device is a terminal device for which the energy base station receives a charging request, and when the remaining power of the terminal device reaches an alarm threshold, the terminal device sends a charging request to the energy base station in the area;

[0009] Determining a priority of each first terminal device according to types of the plurality of first terminal devices;

[0010] Determine a charging sequence of multiple first terminal devices within the same priority level according to the charging time required by each first terminal device; sort the multiple first terminal devices within the same priority level in ascending order of the required charging time to obtain a charging sequence within the priority level;

[0011] For each first terminal device, determining the working time of the first terminal device; the working time of the first terminal device is the working time that the remaining power of the battery in the first terminal device that powers the data transceiver module can last;

[0012] Obtaining the waiting charging time of the first terminal device;

[0013] Determine whether the working time of the first terminal device is less than the waiting time for charging;

[0014] When the working time of the first terminal device is less than the waiting time for charging, a multi-energy base station grouping strategy based on a greedy algorithm is used to use multiple energy base stations to charge the first terminal device;

[0015] When the working time of the first terminal device is not less than the waiting time for charging, continue to wait for the energy base station in the area where the first terminal device is located to charge the first terminal device;

[0016] According to the priority of each terminal device and based on the charging sequence, each first terminal device is charged in sequence.

[0017] Optionally, determining the charging sequence of multiple first terminal devices within the same priority level according to the charging time required by each first terminal device specifically includes:

[0018] Acquire multiple first terminal devices within the same priority level;

[0019] Using the formula Determine the charging time required for each first terminal device; where X i is the charging time required for the i-th first terminal device; ΔG i is the energy replenishment value required by the i-th first terminal device, ΔG i =G f-i -G a-i, G a-i is the alarm threshold of the i-th first terminal device, G f-i is the working threshold of the i-th first terminal device; P i is the radio wave energy power received by the i-th first terminal device, P i =P t g i h i , P t is the transmission power of the energy base station, h i is the receiving gain of the i-th first terminal device, g i is the channel gain between the i-th first terminal device and the energy base station.

[0020] Optionally, when the working time of the first terminal device is less than the waiting time for charging, a multi-energy base station grouping strategy based on a greedy algorithm is used to charge the first terminal device using multiple energy base stations, specifically including:

[0021] Acquire multiple first energy base stations within a distance threshold range of the first terminal device;

[0022] Establishing a charging vector model from each first energy base station to the first terminal device;

[0023] Using the formula Calculate the electric field strength from each first energy base station to the first terminal device; wherein, is the electric field strength from the first energy base station c to the first terminal device n, Z0 is the wave impedance of the plane wave in free space, g c is the channel gain between the first energy base station c and the first terminal device, P c The transmission power of the first energy base station c, d is the distance between the first energy base station c and the first terminal device, λ c is the wavelength of the radio waves emitted by the first energy base station c, φ c The initial phase of the radio wave transmitted by the first energy base station c;

[0024] Sort all first energy base stations in descending order of electric field intensity modulus length to obtain a first energy base station sequence;

[0025] Determine the first first energy base station in the first energy base station sequence as a standard vector; the electric field strength modulus corresponding to the first first energy base station is the largest;

[0026] For the i-th first energy base station, use the phase modulation method to adjust the phase of the radio wave transmitted by the i-th first energy base station, so that the direction and sign of the radio wave transmitted by the i-th first energy base station are consistent with the standard vector;

[0027] Adding the i-th first energy base station to the joint charging group, and updating the joint charging group; the updated joint charging group includes the first i first energy base stations in the sequence of the first energy base stations;

[0028] Determine whether the charging power of the updated joint charging group is less than the first power; the charging power of the updated joint charging group is the sum of the charging powers of all first energy base stations in the updated joint charging group; the first power is the ratio of the energy replenishment value required by the first terminal device to the working time of the first terminal device;

[0029] When the charging power of the updated joint charging group is less than the first power, i is updated with i+1, and the step of adjusting the phase of the radio wave transmitted by the i-th first energy base station by using the phase modulation method is returned to make the direction and sign of the radio wave transmitted by the i-th first energy base station consistent with the standard vector;

[0030] When the charging power of the updated joint charging group is not less than the first power, the first terminal device is charged by using the updated joint charging group.

[0031] The present invention also provides a far-field wireless charging system based on green energy, comprising: an energy base station and a terminal device;

[0032] The energy base station includes an energy collection device and a directional antenna fixed on the communication base station;

[0033] The terminal device includes a first battery, a second battery, an energy converter, an energy receiving antenna, a data transceiver module and an information transceiver antenna; the energy receiving antenna is connected to the input end of the energy converter, the output end of the energy converter is connected to the first battery, and the energy receiving antenna is used to receive the radio waves transmitted by the directional antenna;

[0034] The second battery is connected to the power supply terminal of the data transceiver module, the data transceiver module is connected to the information transceiver antenna, and the data transceiver module transmits and receives information through the information transceiver antenna.

[0035] Optionally, the output end of the energy converter is also connected to the second battery, and the first battery is also connected to the power supply end of the data transceiver module;

[0036] During a first time period, the first battery is connected to the output terminal of the energy converter, the second battery is connected to the power terminal of the data transceiver module, the first battery is disconnected from the power terminal of the data transceiver module, and the second battery is disconnected from the output terminal of the energy converter;

[0037] During a second time period, the first battery is connected to the power supply terminal of the data transceiver module, the second battery is connected to the output terminal of the energy converter, the first battery is disconnected from the output terminal of the energy converter, and the second battery is disconnected from the power supply terminal of the data transceiver module.

[0038] Optionally, it further includes: a first timer switch and a second timer switch;

[0039] The first battery is connected to the output end of the energy converter through the first timer switch, and the second battery is connected to the power supply end of the data transceiver module through the first timer switch;

[0040] The first battery is connected to the power supply terminal of the data transceiver module through the second timer switch, and the second battery is connected to the output terminal of the energy converter through the second timer switch;

[0041] The first timer switch is closed during the first time period, and the first timer is opened during the second time period; the second timer switch is opened during the first time period, and the second timer switch is closed during the second time period.

[0042] Optionally, the energy receiving antenna can be used to receive charging radio waves sent by the energy base station on the one hand, and can also be used to receive electromagnetic waves carrying information sent by the communication base station on the other hand, as an energy source for the terminal device.

[0043] Optionally, the energy converter includes an RC oscillation circuit and a rectifier; the RC oscillation circuit is used to receive radio wave energy, and the rectifier is used to receive electromagnetic wave energy and convert the alternating current of the electromagnetic wave into direct current.

[0044] Optionally, three groups of directional antennas are fixed on the communication base station, and the directional beam formed by each group of directional antennas covers a sector area of ​​120 degrees in a plane.

[0045] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0046] The prior art only focuses on receiving energy and information at the same time, but does not consider receiving energy and sending information at the same time, because the terminal device equipped with a single battery cannot simultaneously receive energy and discharge to power the device, thus affecting the efficiency of energy reception at the receiving end. The terminal device of the present invention can support energy reception and information transmission and reception at the same time, thereby improving the wireless energy reception efficiency at the receiving end.

[0047] In addition, in the far-field wireless charging method based on green energy of the present invention, the different charging needs of most charged objects are met to the maximum extent, so as to improve the charging efficiency per unit time, so that the number of terminal devices that obtain energy replenishment and reach normal working state is maximized within any unit time period. Moreover, since there will be a "constructive or destructive" combination effect between two or more beams that send energy at the same time, this depends on the phase difference between the two radio waves. Existing studies have not considered the power and phase factors when multiple energy base stations are charged together to improve charging efficiency. The multi-energy base station grouping strategy of the present invention based on the greedy algorithm allows multiple radio waves to reach a superimposed state at the receiving end, thereby improving the efficiency of far-field wireless charging. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0049] Figure 1 It is a schematic diagram of the flow of the far-field wireless charging method based on green energy of the present invention;

[0050] Figure 2 It is a schematic diagram of the structure of the far-field wireless charging system based on green energy of the present invention. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0053] In the far-field wireless charging scenario, in order to improve the efficiency of wireless energy transmission, directional antennas are generally used to send energy in a direction. Energy base stations are generally equipped with three groups of directional antennas (the coverage plane is divided into three sector-shaped areas), and one group of directional antennas is responsible for wirelessly charging the IoT terminal devices within a sector-shaped area. For each sector-shaped area, the present invention adopts the directional beam scheduling strategy of the energy base station to ensure that the maximum number of terminal devices in this area can obtain energy replenishment and be in normal working condition at any time. Based on this, the present invention provides a far-field wireless charging method based on green energy, Figure 1 FIG. 1 is a flow chart of a far-field wireless charging method based on green energy according to the present invention. Figure 1 As shown, the following steps are included:

[0054] Step 100: Obtain the types of multiple first terminal devices. The first terminal device is a terminal device for which the energy base station receives a charging request. When the remaining power of the terminal device reaches the alarm threshold, the terminal device sends a charging request to the energy base station in the area. In order to solve the problem of optimizing the scheduling of charging beams in a single sector area, the present invention adopts a dual threshold idea and a greedy algorithm to solve the charging problem of terminal devices. The dual threshold refers to the alarm threshold and the working threshold. When the remaining power in the discharge battery of a terminal device is lower than the alarm threshold, the terminal device will alarm the energy base station in the area, issue a charging request, and switch the current discharge battery to another battery. The discharge battery refers to the battery in the first battery and the second battery that powers the data transceiver module. When the battery in the terminal device that sends a charging request receives wireless charging from the energy base station, when the battery power is increased from the alarm threshold to the working threshold that can maintain the normal operation of the device for a period of time, the terminal device sends a charging end request to the energy base station.

[0055] For an energy base station, the charging area corresponding to one directional antenna of the energy base station will receive charging requests sent by multiple terminal devices, and the terminal device corresponding to the received charging request will be defined as the first terminal device. Then, each charging area of ​​an energy base station will correspond to multiple first terminal devices. The energy base station accurately determines the type of each first terminal device based on the MAC address and interactive signaling of the first terminal device. The types of first terminal devices include security equipment, monitoring equipment, public equipment, entertainment equipment and other equipment.

[0056] Step 200: Determine the priority of each first terminal device according to the types of the multiple first terminal devices. Each type corresponds to a different priority, and the priority of each first terminal device can be determined according to the type of each first terminal device. The priority refers to the charging priority, and the first terminal device with a high priority is charged first.

[0057] Step 300: Determine the charging sequence of multiple first terminal devices within the same priority level according to the charging time required by each first terminal device. When there are multiple first terminal devices within the same priority level, in order to maximize the number of terminal devices that remain in working state within any average time period, the energy base station will first charge the first terminal device with the shortest charging time among the devices with the same priority level. Therefore, for multiple first terminal devices within the same priority level, the formula The charging time required for each first terminal device is determined, and then the multiple first terminal devices within the same priority level are sorted in ascending order of the required charging time to obtain a charging sequence within the same priority level.

[0058] Where, X i is the charging time required for the i-th first terminal device; ΔG i is the energy replenishment value required by the i-th first terminal device, ΔG i =G f-i -G a-i , G a-i is the alarm threshold of the i-th first terminal device, G f-i is the working threshold of the i-th first terminal device; P i is the radio wave energy power received by the i-th first terminal device, P i =P t g i h i , P t is the transmission power of the energy base station, h i is the receiving gain of the i-th first terminal device, g i is the channel gain between the i-th first terminal device and the energy base station.

[0059] Step 400: Charge each first terminal device in turn according to the priority of each terminal device and based on the charging sequence. Charge each first terminal device to be charged in turn according to the charging sequence in accordance with the principle that the device with the highest priority is charged first and the device with the shortest charging time is charged first within the same priority.

[0060] For each first terminal device to be charged, when the battery to be charged sends a charging request, the other battery still has enough power to support the terminal device for a period of time. When a single energy base station cannot meet the charging demand of the first terminal device, that is, when the working time of the first terminal device is less than the waiting charging time, a multi-energy base station grouping strategy based on a greedy algorithm uses multiple nearby energy base stations to jointly charge the first terminal device. The working time of the first terminal device refers to the time that another battery can support the operation of the terminal device. The waiting charging time refers to the time from sending a charging request to the completion of the current battery charging, that is, the sum of the charging completion time of the first K-1 first terminal devices and the charging completion time of its own battery. The current first terminal device is the Kth charging device, and the charging time is x K .

[0061] When the beams of multiple energy base stations charge a terminal device together, the nonlinear superposition of multiple radio waves will produce the effect of energy superposition or cancellation. To address this problem, the present invention adopts a vector model, which uses a two-dimensional vector to represent the electric field strength of the electromagnetic waves emitted by each energy base station to the first terminal device to be charged, so that the real and imaginary parts of the electric field strength can be clearly represented, and then the power received by the receiving end can be controlled by adjusting the parameters of the charging beam in the expression of the electric field strength and the received power at the receiving end, so as to achieve the optimal charging efficiency; at the same time, the present invention proposes a multi-energy base station grouping strategy based on a greedy algorithm, which ensures that the number of energy base stations in the group is as small as possible while achieving the maximum efficiency of energy transmission, so as to reduce the risk of other devices to be charged running out of power while waiting in line for charging.

[0062] Assume that there are a total of N first terminal devices that need to be jointly charged by multiple base stations, and there are a total of C energy base stations nearby that can provide them with electricity; the first terminal device that needs to be jointly charged by multiple base stations is represented by n, and the energy base station is represented by c.

[0063] First, we introduce the vector model. In the scenario where a single base station charges a single device, we can calculate the power received by the first terminal device n being charged based on the existing energy transmission theory and model. Assume that the initial beam phase of the energy base station c is φ c , the electric field strength reaching the receiving end and received power It can be expressed by the following two formulas:

[0064]

[0065] Now the charging scenario is extended to c energy base stations charging one terminal device. Assuming that all base stations have the same transmission beam frequency, the total receiving power of this device can be expressed by the following formula:

[0066]

[0067] Where Φ is the set of the imaginary parts of the electric field strength of all energy base stations at the terminal device, and φ c ∈Φ, Ω represents the set of C energy base stations.

[0068] Assuming that the antenna gains of all energy base stations are the same, the Euler formula is used to expand formula (1), and the real and imaginary parts are represented by a two-dimensional vector, the following formula can be obtained:

[0069]

[0070] For formula (3), the electric field strength of each energy base station on the device to be charged is are a set of two-dimensional vectors. When summing them, the result of the combination is additive only when the signs of the corresponding components of all vectors are the same; and the strongest additive property can be achieved only when the directions of all vectors are the same. By observing formula (4), when the distance d between the energy base station and the charged device is fixed, theoretically there are two ways to control the direction of the two-dimensional vector:

[0071] 1. Frequency modulation method: by adjusting λ c To control the direction of the vector;

[0072] 2. Phase modulation method: adjust the initial phase φ of the transmitter c to control the direction of the vector.

[0073] Because the number of energy base stations that can provide wireless charging is limited, when multiple first terminal devices request charging, the optimization goal is to minimize the number of energy base stations in the charging group while meeting their charging needs. This can reduce the number of terminal devices waiting in line to be charged and reduce the risk of terminal devices running out of power due to long waiting time. Taking the phase adjustment method as an example, the multi-energy base station grouping strategy based on the greedy algorithm uses multiple energy base stations to charge the first terminal device as follows:

[0074] Step 1: Obtain multiple first energy base stations within the distance threshold range of the first terminal device.

[0075] Step 2: Establish a charging vector model from each first energy base station to the first terminal device.

[0076] Step3: Use formula Calculate the electric field strength from each first energy base station to the first terminal device. is the electric field strength from the first energy base station c to the first terminal device n, Z0 is the wave impedance of the plane wave in free space, gc is the channel gain between the first energy base station c and the first terminal device, P c The transmission power of the first energy base station c, d is the distance between the first energy base station c and the first terminal device, λ c is the wavelength of the radio waves emitted by the first energy base station c, φ c The initial phase of the radio wave transmitted by the first energy base station c;

[0077] Step 4: Sort all first energy base stations in descending order according to the electric field intensity modulus to obtain a first energy base station sequence.

[0078] Step 5: Determine the first first energy base station in the first energy base station sequence as the standard vector. The first first energy base station is the first energy base station with the largest electric field strength modulus. Then, according to the first energy base station sequence, execute Step 6-Step 10 for each first energy base station in turn.

[0079] Step 6: For the ith first energy base station, use the phase modulation method to adjust the phase of the radio wave transmitted by the ith first energy base station, so that the direction and sign of the radio wave transmitted by the ith first energy base station are consistent with the standard vector.

[0080] Step 7: Add the i-th first energy base station to the joint charging group and update the joint charging group. The updated joint charging group includes the first i first energy base stations in the sequence of the first energy base stations.

[0081] Step 8: Determine whether the charging power of the updated joint charging group is less than the first power. If yes, execute Step 9; if no, execute Step 10. The charging power of the updated joint charging group is the sum of the charging powers of all first energy base stations in the updated joint charging group; the first power is the ratio of the energy replenishment value required by the first terminal device to the working time of the first terminal device.

[0082] Step 9: i=i+1, return to Step 6, and continue to determine the next energy device.

[0083] Step 10: Use the updated combined charging group to charge the first terminal device. The updated combined charging group is the combined charging group that ultimately charges the first terminal device.

[0084] Figure 2 FIG. 1 is a schematic diagram of the structure of the far-field wireless charging system based on green energy of the present invention. Figure 2As shown, the far-field wireless charging system based on green energy of the present invention includes: an energy base station 1 and a terminal device. The energy base station of the present invention is a green energy base station, and the energy base station 1 includes a green energy collection device and a directional antenna fixed on the communication base station. The communication base station can use a common small communication base station, such as a pico base station (or a wireless network access point, etc.), to perform green wireless charging for nearby Internet of Things terminal devices. Taking the pico base station as an example, an energy collection device and a directional antenna are installed on the pico base station to constitute the energy base station 1 of the present invention. The energy collection device is a green energy collection device, including solar panels, small wind energy blades and dual batteries. The green energy collection device is assembled on the existing communication base station, and the traditional power grid is a backup power supply. The present invention installs three groups of directional antennas on the communication base station, and the planar coverage range of the three groups of directional antennas is divided into three sector-shaped areas, and the central angle of the sector-shaped areas is 120 degrees. Each group of directional antennas forms a directional beam, which can realize the directional transmission of radio waves, that is, radiate electromagnetic waves in a fixed direction. If the directional antenna is installed according to the requirements, directional transmission can be achieved, and radio waves are radiated to the IoT terminal devices in each sector area for wireless charging. The coverage range of each set of directional antennas is 120 degrees, and the three sets of directional antennas cover a 360-degree plane. According to actual needs, the coverage range of each set of directional antennas can be other angles. At the same time, the coverage range of the three sets of directional antennas can also overlap to perform wireless charging in specific areas.

[0085] In order to further improve the energy receiving efficiency of the terminal device, it is necessary to solve the problem that the receiving end does not support simultaneous reception of energy and transmission and reception of information in the existing research results in the field. The present invention improves the new type of Internet of Things terminal device in view of this problem, and equips the terminal device of the Internet of Things with a small dual battery module, namely the first battery 2-1 and the second battery 2-4, and correspondingly improves the energy receiving circuit and the data transceiver circuit. Specifically, the terminal device of the present invention includes a first battery 2-1, an energy converter 2-2, an energy receiving antenna 2-3, a second battery 2-4, a data transceiver module 2-5 and an information transceiver antenna 2-6. The energy receiving antenna 2-3 is connected to the input end of the energy converter 2-2, and the output end of the energy converter 2-2 is connected to the first battery 2-1. The energy receiving antenna 2-3 is used to receive the radio waves emitted by the directional antenna, and then converts them through the energy converter 2-2, and transmits them to the corresponding first battery 2-1 (or the second battery 2-2) for charging. The second battery 2-4 is connected to the power supply terminal of the data transceiver module 2-5, the data transceiver module 2-5 is connected to the information transceiver antenna 2-6, and the data transceiver module 2-5 transmits and receives information through the information transceiver antenna 2-6.

[0086] In addition, the output end of the energy converter 2-2 of the present invention is also connected to the second battery 2-4, and the first battery 2-1 is also connected to the power supply end of the data transceiver module 2-5. At this time, the energy converter 2-1 is connected to both the first battery 2-1 and the second battery 2-4, and the data transceiver module 2-5 is connected to both the first battery 2-1 and the second battery 2-4. The charging function and the discharging function of the first battery 2-1 are performed alternately according to the time period, and the discharging function and the charging function of the second battery 2-4 are performed alternately according to the time period.

[0087] In the first time period, the first battery 2-1 is connected to the output end of the energy converter 2-2, and the second battery 2-4 is connected to the power supply end of the data transceiver module 2-5. At the same time, the first battery 2-1 is disconnected from the power supply end of the data transceiver module 2-5, and the second battery 2-4 is disconnected from the output end of the energy converter 2-2. At this time, the energy base station charges the first battery 2-1 to realize the long-distance wireless charging function of the terminal device; at the same time, the second battery 2-4 uses the energy collected in the previous time period to power the data transceiver module 2-5 to realize the data transceiver function of the terminal device.

[0088] The second time period is a time period different from the first time period. During the second time period, the first battery 2-1 is connected to the power supply terminal of the data transceiver module 2-5, and the second battery 2-4 is connected to the output terminal of the energy converter 2-2. At the same time, the first battery 2-1 is disconnected from the output terminal of the energy converter 2-2, and the second battery 2-4 is disconnected from the power supply terminal of the data transceiver module 2-5. At this time, the energy base station charges the second battery 2-4 to realize the long-distance wireless charging function of the terminal device; at the same time, the first battery 2-1 uses the energy collected in the previous time period to power the data transceiver module 2-5 to realize the data transceiver function of the terminal device.

[0089] As another embodiment, the present invention can use a timer switch to achieve the switching between the above-mentioned first time period and the second time period. Specifically, the first battery 2-1 is connected to the output end of the energy converter 2-2 through the first timer switch, and the second battery 2-1 is also connected to the power supply end of the data transceiver module 2-5 through the first timer switch. The first battery 2-1 is connected to the power supply end of the data transceiver module 2-5 through the second timer switch, and the second battery 2-4 is connected to the output end of the energy converter 2-2 through the second timer switch. The first timer switch is closed in the first time period and disconnected in the second time period; the second timer switch is disconnected in the first time period and closed in the second time period. In this way, the first battery 2-1 and the second battery 2-4 exchange the charging and discharging roles in different time periods. The present invention can also use a circuit switcher to replace the first timer switch and the second timer switch. The circuit switcher periodically switches the above circuit according to the time period, that is, switches the energy converter, so as to achieve the first battery 2-1 and the second battery 2-4 exchange the charging and discharging roles in different time periods.

[0090] The energy receiving antenna 2-3 of the present invention can be a single antenna or a group of multiple antennas, which can receive radio waves sent by the energy base station 1, and can also receive electromagnetic waves carrying information sent by the communication base station, and then convert them into energy that can be stored in the first battery 2-1 and the second battery 2-4 through the energy converter. Specifically, the energy converter 2-2 is equipped with an RC oscillator circuit and a rectifier, the RC oscillator circuit is used to receive radio wave energy, and the rectifier is used to receive electromagnetic wave energy and convert the alternating current of the electromagnetic wave into direct current, so as to charge the first battery 2-1 or the second battery 2-4.

[0091] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0092] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A far-field wireless charging method based on green energy, characterized in that: The far-field wireless charging method comprises: Acquire the types of multiple first terminal devices; the first terminal device is a terminal device for which the energy base station receives a charging request; when the remaining power of the terminal device reaches an alarm threshold, the terminal device sends a charging request to the energy base station in the area; Determining a priority of each first terminal device according to types of the plurality of first terminal devices; Determine a charging sequence of multiple first terminal devices within the same priority level according to the charging time required by each first terminal device; sort the multiple first terminal devices within the same priority level in ascending order of the required charging time to obtain a charging sequence within the priority level; For each first terminal device, determining the working time of the first terminal device; the working time of the first terminal device is the working time that the remaining power of the battery in the first terminal device that powers the data transceiver module can last; Obtaining the waiting charging time of the first terminal device; Determine whether the working time of the first terminal device is less than the waiting time for charging; When the working time of the first terminal device is less than the waiting time for charging, a multi-energy base station grouping strategy based on a greedy algorithm is used to use multiple energy base stations to charge the first terminal device; When the working time of the first terminal device is not less than the waiting time for charging, continue to wait for the energy base station in the area where the first terminal device is located to charge the first terminal device; According to the priority of each terminal device and based on the charging sequence, each first terminal device is charged in sequence.

2. The green energy-based far-field wireless charging method according to claim 1, characterized in that: The step of determining the charging sequence of multiple first terminal devices within the same priority level according to the charging time required by each first terminal device specifically includes: Acquire multiple first terminal devices within the same priority level; Using the formula Determine the charging time required for each first terminal device; where X i is the charging time required for the i-th first terminal device; ΔG i is the energy replenishment value required by the i-th first terminal device, ΔG i =G f-i -G a-i , G a-i is the alarm threshold of the i-th first terminal device, G f-i is the working threshold of the i-th first terminal device; P i is the radio wave energy power received by the i-th first terminal device, P i =P t g i h i , P t is the transmission power of the energy base station, h i is the receiving gain of the i-th first terminal device, g i is the channel gain between the i-th first terminal device and the energy base station.

3. The green energy-based far-field wireless charging method according to claim 1, characterized in that: When the working time of the first terminal device is less than the waiting time for charging, a multi-energy base station grouping strategy based on a greedy algorithm is used to charge the first terminal device using multiple energy base stations, specifically including: Acquire multiple first energy base stations within a distance threshold range of the first terminal device; Establishing a charging vector model from each first energy base station to the first terminal device; Using the formula Calculate the electric field strength from each first energy base station to the first terminal device; wherein, is the electric field strength from the first energy base station c to the first terminal device n, Z0 is the wave impedance of the plane wave in free space, g c is the channel gain between the first energy base station c and the first terminal device, P c The transmission power of the first energy base station c, d is the distance between the first energy base station c and the first terminal device, λ c is the wavelength of the radio waves emitted by the first energy base station c, φ c The initial phase of the radio wave transmitted by the first energy base station c; Sort all first energy base stations in descending order of electric field intensity modulus length to obtain a first energy base station sequence; Determine the first first energy base station in the first energy base station sequence as a standard vector; the electric field strength modulus corresponding to the first first energy base station is the largest; For the i-th first energy base station, use the phase modulation method to adjust the phase of the radio wave transmitted by the i-th first energy base station, so that the direction and sign of the radio wave transmitted by the i-th first energy base station are consistent with the standard vector; Add the i-th first energy base station to the joint charging group, and update the joint charging group; the updated joint charging group includes the first i first energy base stations in the sequence of the first energy base stations; Determine whether the charging power of the updated joint charging group is less than the first power; the charging power of the updated joint charging group is the sum of the charging powers of all first energy base stations in the updated joint charging group; the first power is the ratio of the energy replenishment value required by the first terminal device to the working time of the first terminal device; When the charging power of the updated joint charging group is less than the first power, i is updated with i+1, and the step of adjusting the phase of the radio wave transmitted by the i-th first energy base station by using the phase modulation method is returned to make the direction and sign of the radio wave transmitted by the i-th first energy base station consistent with the standard vector; When the charging power of the updated joint charging group is not less than the first power, the first terminal device is charged by using the updated joint charging group.

4. A far-field wireless charging system based on green energy, characterized in that: The green energy-based far-field wireless charging system performs wireless charging based on the green energy-based far-field wireless charging method according to any one of claims 1 to 3, and the green energy-based far-field wireless charging system comprises: an energy base station and a terminal device; The energy base station includes an energy collection device and a directional antenna fixed on the communication base station; The terminal device includes a first battery, a second battery, an energy converter, an energy receiving antenna, a data transceiver module and an information transceiver antenna; the energy receiving antenna is connected to the input end of the energy converter, the output end of the energy converter is connected to the first battery, and the energy receiving antenna is used to receive the radio waves transmitted by the directional antenna; The second battery is connected to the power supply terminal of the data transceiver module, the data transceiver module is connected to the information transceiver antenna, and the data transceiver module transmits and receives information through the information transceiver antenna.

5. The green energy-based far-field wireless charging system according to claim 4, characterized in that: The output end of the energy converter is also connected to the second battery, and the first battery is also connected to the power supply end of the data transceiver module; During a first time period, the first battery is connected to the output terminal of the energy converter, the second battery is connected to the power terminal of the data transceiver module, the first battery is disconnected from the power terminal of the data transceiver module, and the second battery is disconnected from the output terminal of the energy converter; During a second time period, the first battery is connected to the power supply terminal of the data transceiver module, the second battery is connected to the output terminal of the energy converter, the first battery is disconnected from the output terminal of the energy converter, and the second battery is disconnected from the power supply terminal of the data transceiver module.

6. The green energy-based far-field wireless charging system according to claim 5, characterized in that: Also includes: a first timer switch and a second timer switch; The first battery is connected to the output end of the energy converter through the first timer switch, and the second battery is connected to the power supply end of the data transceiver module through the first timer switch; The first battery is connected to the power supply terminal of the data transceiver module through the second timer switch, and the second battery is connected to the output terminal of the energy converter through the second timer switch; The first timer switch is closed during the first time period, and the first timer is opened during the second time period; the second timer switch is opened during the first time period, and the second timer switch is closed during the second time period.

7. The green energy-based far-field wireless charging system according to claim 4, characterized in that: The energy receiving antenna is also used to receive electromagnetic waves carrying information sent by the communication base station.

8. The green energy-based far-field wireless charging system according to claim 7, characterized in that: The energy converter includes an RC oscillating circuit and a rectifier; the RC oscillating circuit is used to receive radio wave energy, and the rectifier is used to receive electromagnetic wave energy and convert the alternating current of the electromagnetic wave into direct current.

9. The green energy-based far-field wireless charging system according to claim 4, characterized in that: The communication base station is fixed with three groups of directional antennas, and the directional beam formed by each group of directional antennas covers a sector area of ​​120 degrees in a plane.

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