Radio frequency charging method and system for wireless sensor network

Abstract

The invention discloses a radio frequency charging method and system for a wireless sensor network. The radio frequency charging system for the wireless sensor network comprises the wireless sensor network and a ground mobile radio frequency charging device for transmitting radio frequency energy to the wireless sensor network for charging. The wireless sensing network comprises one or more wireless sensing nodes; and the ground mobile radio frequency charging device charges one or a single wireless sensing node in the wireless sensing network. The wireless sensor network node can be simply and conveniently charged, the service life of the wireless sensor network is prolonged, the tedious work of battery replacement is reduced, and the product reliability problem caused by regular wired charging or battery replacement is avoided.

Description

Technical Field

[0001] The present application relates to the field of rockets, and in particular, to a method and system for radio frequency charging of a wireless sensor network. Background Art

[0002] With the advent of the Internet of Things, the demand for automatic sensing equipment is growing. Various sensing devices are deployed in various applications to form a large number of wireless sensor networks, including military, healthcare, and environmental monitoring. Due to the differences in application scenarios, there are different requirements for the life of the sensor network and the size of the energy module. With the increasing degree of integration of rocket system equipment, wireless sensor networks have also been maturely applied on launch vehicles in recent years, greatly reducing the complexity and weight of the cable network and increasing the rocket's carrying capacity. At present, wireless sensor networks are basically powered by built-in lithium batteries. If the sensor node needs to be stored or used for a long time, the following methods are basically used at this stage: (1) Based on the characteristics of the sensor network, the life of the wireless sensor node is extended by energy-saving methods such as sleeping when the wireless sensor node is not working and waking up when it needs to work; (2) According to the application scenario, the battery charger is used to periodically charge the battery of the wireless sensor network or replace the lithium battery of the sensor network. By controlling the wireless sensor node to sleep when it is not working and waking up when it needs to work, the actual use needs can be met within a certain period of use. However, when the energy consumption exceeds the maximum capacity of the battery during use, it is still necessary to charge or replace the battery regularly. Taking into account the particularity of launch vehicles, there are situations where long-term testing, long-term storage after assembly, or batteries are inconvenient to charge and replace during use.

[0003] Therefore, how to provide a contactless radio frequency charging method for wireless sensor networks has become an urgent problem to be solved in this field. Summary of the Invention

[0004] The present application proposes a wireless sensor network RF charging system, including a wireless sensor network and a ground mobile RF charging device; the wireless sensor network includes one or more wireless sensor nodes; the ground mobile RF charging device charges one or a single wireless sensor node in the wireless sensor network.

[0005] The wireless sensor network RF charging system as described above, wherein the mobile RF charging device includes an envelope control unit, a power supply and oscillation unit, a power amplification unit, and a directional transmitting antenna; the power supply and oscillation unit is used to generate a RF signal; the power amplification unit is used to amplify the power of the RF signal generated by the power supply and oscillation unit; the directional transmitting antenna is used to transmit the power-amplified RF signal; and the control unit is used to wake up one or more wireless sensor nodes to start receiving RF energy.

[0006] In the wireless sensor network radio frequency charging system as described above, the radio frequency signal is a radio frequency signal above 1 MHz.

[0007] In the wireless sensor network RF charging system as described above, the control unit is connected to the directional transmitting antenna and is used to wake up one or more wireless sensor nodes after the directional transmitting antenna transmits the power-amplified RF signal.

[0008] The wireless sensor network radio frequency charging system as described above further includes a setting unit, which sets the control unit to wake up one or more wireless sensor nodes within a specified period.

[0009] In the wireless sensor network RF charging system as described above, each wireless sensor node includes a receiving antenna, an impedance matching unit, a rectifier unit, and a power supply battery; the receiving antenna is used to collect RF energy in space; the impedance matching unit is used to transmit the RF energy collected by the receiving antenna to the rectifier unit; and the rectifier unit is used to convert AC power into DC power to charge the power supply battery.

[0010] In the wireless sensor network RF charging system as described above, one or more wireless sensor nodes feed back node power parameters to a ground mobile RF charging device, the mobile ground RF charging device receives the node power parameters, and the setting unit sets the control unit to automatically control the awakening of one or more wireless sensor nodes and charge the one or more wireless sensor nodes by monitoring the battery power parameters.

[0011] In the wireless sensor network RF charging system as described above, when the battery power parameter is lower than a specified threshold, the control unit in the mobile RF charging device is configured to automatically wake up one or more wireless sensor nodes.

[0012] A method for radio frequency charging of a wireless sensor network comprises the following steps: a ground mobile radio frequency charging device wakes up one or more wireless sensor nodes in the wireless sensor network; after the ground mobile radio frequency charging device wakes up the one or more wireless sensor nodes in the wireless sensor network, it generates a radio frequency source signal and sends it to the one or more wireless sensor nodes in the wireless sensor network; and the one or more wireless sensor nodes convert the sent radio frequency source signal into direct current and charge the device.

[0013] The method for RF charging of a wireless sensor network as described above further includes: one or more wireless sensor nodes feeding back node power parameters to a ground mobile RF charging device; the ground mobile RF charging device receives the node power parameters; and by monitoring the battery power parameters, a control unit is set to automatically control the awakening of the one or more wireless sensor nodes and charge the one or more wireless sensor nodes.

[0014] This application has the following beneficial effects:

[0015] This application enables simple and convenient charging of wireless sensor network nodes, extending the service life of the wireless sensor network, reducing the tedious work of battery replacement, and avoiding product reliability issues caused by regular wired charging or battery replacement. It also ensures the application life of wireless sensor networks at different stages of application in special scenarios such as launch vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in this application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0017] Figure 1 Schematic diagram of the internal structure of a wireless sensor network radio frequency charging system provided according to an embodiment of the present application;

[0018] Figure 2 is another internal structure diagram of the wireless sensor network RF charging system provided according to an embodiment of the present application;

[0019] Figure 3 is another internal structure diagram of the wireless sensor network RF charging system provided according to an embodiment of the present application;

[0020] Figure 4 This is a flowchart of a method for wireless sensor network radio frequency charging provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0021] The following is a clear and complete description of the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0022] Example 1

[0023] like Figure 1 As shown, this embodiment provides a wireless sensor network radio frequency charging system, including a wireless sensor network 110 and a ground mobile radio frequency charging device 120 for transmitting radio frequency energy to charge the wireless sensor network.

[0024] The wireless sensor network includes one or more wireless sensor nodes, and the ground mobile radio frequency charging device can charge a single wireless sensor node in the wireless sensor network, or can charge multiple wireless sensor nodes in the wireless sensor network at the same time.

[0025] Specifically, if Figure 2 As shown, the ground mobile radio frequency charging device 110 includes a power supply and oscillation unit 210 , a power amplification unit 220 , a directional transmitting antenna 230 and a control unit 240 .

[0026] The power supply and oscillation unit 210 is used to generate a radio frequency signal above 1 MHz.

[0027] The transmission distance of the radio frequency signal can reach 1,000 meters without any obstacles.

[0028] The power amplification unit 220 is connected to the power supply and oscillation unit 210 and is used to increase the power of the radio frequency signal generated by the power supply and oscillation unit so as to generate more energy to be transmitted to one or more wireless sensor nodes.

[0029] The directional transmitting antenna 230 is connected to the power amplifying unit 220 and is used to transmit the radio frequency signal after power amplification so that one or more wireless sensor nodes can receive it.

[0030] The control unit 240 is configured to wake up one or more wireless sensor nodes to start receiving radio frequency energy.

[0031] As another embodiment, the control unit 240 is connected to the directional transmitting antenna 230 and is configured to wake up one or more wireless sensor nodes after the directional transmitting antenna transmits the power-amplified radio frequency signal.

[0032] Still as another embodiment, a setting unit (not shown) is further included. In the scenario of outdoor application, the setting unit sets the control unit 240 to a mode of regularly waking up one or more wireless sensor nodes, and one or more wireless sensor network nodes can be regularly charged.

[0033] This embodiment uses a directional transmitting antenna to enable nodes within a certain range to be charged, which, to a certain extent, improves the energy loss caused by single-point charging. In addition, the directional antenna has a strong ability to concentrate energy radiation.

[0034] Specifically, if Figure 3 As shown, each wireless sensor node includes a receiving antenna 310 , an impedance matching unit 320 , a rectifying unit 330 and a power supply battery 340 .

[0035] The receiving antenna 310 is used to collect radio frequency energy in space.

[0036] The impedance matching unit 320 is connected to the receiving antenna 310 and is used to transmit the radio frequency energy collected by the receiving antenna to the rectifying unit with maximum efficiency.

[0037] The rectifier unit 330 is connected to the impedance matching unit 320 and is used to convert AC power into DC power, and finally charge the power supply battery.

[0038] The impedance matching unit 320 can be understood as an impedance matching circuit. In order to obtain maximum power output and convert the received RF signal into electrical energy more effectively, the impedance matching circuit parameters are selected to ensure that the load impedance and the signal source impedance are conjugate complex numbers. Distributed parameter matching can be performed using microstrip lines during design.

[0039] Rectifier unit 330 can be understood as a rectifier circuit. The rectifier module utilizes Schottky diodes, which offer low threshold voltage, low on-resistance, and low junction capacitance, making them ideal for conditioning small signals. The rectifier circuit utilizes voltage-doubling rectification, which not only converts AC signals into DC signals but also increases the output voltage, significantly improving energy conversion efficiency.

[0040] Furthermore, one or more wireless sensor nodes can periodically feed back node power parameters to the mobile RF charging device through a receiving antenna, and the mobile RF charging device receives the node power parameters through a directional transmitting antenna. The setting unit sets the control unit to automatically control the awakening of one or more wireless sensor nodes by monitoring the battery power parameters, and automatically charges the one or more wireless sensor nodes in the above manner.

[0041] For example, when the battery power parameter is lower than a specified threshold, the setting unit sets the control unit to automatically wake up one or more wireless sensor nodes.

[0042] After the wireless sensor network is assembled on the rocket, for safety and reliability reasons, it is not suitable to replace the battery or connect it to the rocket with a cable for charging. At this time, the mobile RF charging device of this embodiment is placed within a certain range of multiple nodes of the wireless sensor network on the rocket, and the control circuit is used to wake up one or more wireless sensor nodes on the rocket. Then, the RF signal emitted by the mobile RF charging device is received, and after impedance matching and voltage doubling rectification, the RF signal is converted into a DC signal to charge and replenish the batteries of one or more wireless sensor nodes.

[0043] Example 2

[0044] like Figure 4 As shown, this embodiment provides a method for radio frequency charging of a wireless sensor network, which specifically includes the following steps:

[0045] Step S1: The ground mobile radio frequency charging device wakes up one or more wireless sensor nodes in the wireless sensor network.

[0046] Step S2: After waking up one or more wireless sensor nodes in the wireless sensor network, the ground mobile radio frequency charging device generates a radio frequency source signal and sends it to the one or more wireless sensor nodes in the wireless sensor network.

[0047] Step S3: One or more wireless sensor nodes convert the transmitted RF source signal into direct current and charge the device.

[0048] Furthermore, one or more wireless sensor nodes feed back node power parameters to the ground mobile RF charging device, and the ground mobile RF charging device receives the node power parameters, and sets the control unit to automatically control the awakening of one or more wireless sensor nodes by monitoring the battery power parameters, and charges the one or more wireless sensor nodes.

[0049] This application has the following beneficial effects:

[0050] This application enables simple and convenient charging of wireless sensor network nodes, extending the service life of the wireless sensor network, reducing the tedious work of battery replacement, and avoiding product reliability issues caused by regular wired charging or battery replacement. It also ensures the application life of wireless sensor networks at different stages of application in special scenarios such as launch vehicles.

[0051] Although the present application has been described with reference to examples, this is for illustrative purposes only and is not intended to limit the present application, and changes, additions and / or deletions to the embodiments may be made without departing from the scope of the present application.

[0052] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A wireless sensor network radio frequency charging system, characterized in that: Including wireless sensor networks and ground mobile radio frequency charging devices; The wireless sensor network includes one or more wireless sensor nodes; The ground mobile radio frequency charging device charges one or a single wireless sensor node in the wireless sensor network.

2. The wireless sensor network radio frequency charging system according to claim 1, wherein: Mobile radio frequency charging device envelope control unit, power supply and oscillation unit, power amplifier unit, and directional transmitting antenna; A power supply and oscillation unit for generating a radio frequency signal; A power amplifier unit, used to amplify the power of the radio frequency signal generated by the power supply and oscillation unit; Directional transmitting antenna, used to transmit the radio frequency signal after power amplification; The control unit is used to wake up one or more wireless sensor nodes to start receiving radio frequency energy.

3. The wireless sensor network radio frequency charging system according to claim 2, wherein: The radio frequency signal is a radio frequency signal above 1 MHz.

4. The wireless sensor network radio frequency charging system according to claim 2, wherein: The control unit is connected to the directional transmitting antenna and is used to wake up one or more wireless sensor nodes after the directional transmitting antenna transmits the radio frequency signal after power amplification.

5. The wireless sensor network radio frequency charging system according to claim 2, wherein: The system also includes a setting unit, which sets the control unit to wake up one or more wireless sensor nodes within a specified period.

6. The wireless sensor network radio frequency charging system according to claim 2, wherein: Each wireless sensor node includes a receiving antenna, an impedance matching unit, a rectifier unit, and a power supply battery; a receiving antenna for collecting radio frequency energy in space; An impedance matching unit, used to transmit the radio frequency energy collected by the receiving antenna to the rectifier unit; The rectifier unit is used to convert AC power into DC power to charge the power supply battery.

7. The wireless sensor network radio frequency charging system according to any one of claims 1 to 6, wherein: One or more wireless sensor nodes feed back node power parameters to the ground mobile RF charging device, the mobile ground RF charging device receives the node power parameters, and the setting unit sets the control unit to automatically control the awakening of one or more wireless sensor nodes and charge the one or more wireless sensor nodes by monitoring the battery power parameters.

8. The wireless sensor network radio frequency charging system according to claim 7, wherein: When the battery power parameter is lower than a specified threshold, the control unit in the mobile radio frequency charging device is set to automatically wake up one or more wireless sensor nodes.

9. A method for radio frequency charging of a wireless sensor network, characterized in that: The following steps are involved: The ground mobile radio frequency charging device wakes up one or more wireless sensor nodes in the wireless sensor network; After the ground mobile radio frequency charging device wakes up one or more wireless sensor nodes in the wireless sensor network, it generates a radio frequency source signal and sends it to the one or more wireless sensor nodes in the wireless sensor network; One or more wireless sensor nodes convert the transmitted RF source signal into direct current and charge the device.

10. The wireless sensor network radio frequency charging method according to claim 9, characterized in that: It also includes one or more wireless sensor nodes feeding back node power parameters to a ground mobile radio frequency charging device, the ground mobile radio frequency charging device receiving the node power parameters, and automatically controlling the control unit to wake up one or more wireless sensor nodes and charge the one or more wireless sensor nodes by monitoring the battery power parameters.

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