A channel flow measurement device based on energy recovery

Abstract

The present application discloses a channel flow measurement device based on energy recovery, which is applied to the irrigation channel of the agricultural irrigation system, and is characterized in that the channel flow measurement device includes a piezoelectric generator, an energy collection circuit, a power distribution power supply, a wireless transmission unit, an ultrasonic probe, an analog front-end unit, a processor and a storage unit. The piezoelectric generator generates electrical energy under the action of water pressure and supplies power to various electrical devices after being sorted by the energy collection circuit. The processor calculates the flow data based on the water flow velocity signal of the ultrasonic probe at different positions, and sends the flow data to the irrigation control system through the wireless transmission unit to realize the measurement of the flow in the irrigation channel. Through this device, the current flow of water in the channel can be obtained without manual measurement and calculation, thereby improving the measurement efficiency.

Description

Technical Field

[0001] The present application relates to the field of agricultural technology, and more specifically, to a channel flow measurement device based on energy recovery. Background Art

[0002] With the development of agricultural modernization, the requirements for intensive and intelligent management of all aspects of agriculture are becoming increasingly higher. Agricultural irrigation is an important link in agricultural production. In order to achieve water conservation and refined water use, it is necessary to measure the flow of irrigation channels deep into the fields. However, there is currently no dedicated equipment to measure the channel flow in real time. The current flow can only be obtained by manual calculation based on the water level of the channel, and the measurement efficiency is extremely low. Summary of the invention

[0003] In view of this, the present application provides a channel flow measurement device based on energy recovery, which is used to detect the flow of water in a channel to improve the measurement efficiency of the channel flow.

[0004] In order to achieve the above objectives, the proposed solution is as follows:

[0005] A channel flow measurement device based on energy recovery is applied to an irrigation channel of an agricultural irrigation system. The channel flow measurement device includes a piezoelectric generator, an energy collection circuit, a power distribution power supply, a wireless transmission unit, an ultrasonic probe, an analog front-end unit, a processor and a storage unit, wherein:

[0006] The piezoelectric generator is arranged below the water surface in the irrigation channel;

[0007] The energy collection circuit is provided with an energy collection end and an energy output end, the energy collection end is electrically connected to the output end of the piezoelectric generator, and the energy output end is electrically connected to the input end of the power distribution power supply;

[0008] The power distribution power supply is used to supply power to the power consumption unit in the channel flow measurement device based on the received power energy;

[0009] The ultrasonic probe is arranged in the irrigation channel and outputs water flow velocity signals reflecting different water layers in the channel;

[0010] The analog front end unit is connected to the ultrasonic probe signal, and is used to receive the water flow velocity signal, filter and amplify the water flow velocity signal, and output the filtered and amplified water flow velocity signal to the processor;

[0011] The processor is provided with a signal input terminal, a first data output terminal and a second data output terminal, the signal input terminal is used to receive the water flow velocity signal, the first data output terminal is used to output flow data, and the second data output terminal is used to output the flow data;

[0012] The storage unit is signal-connected to the first data output terminal, and is used to receive and store the flow data;

[0013] The wireless transmission unit is signal-connected to the second data output terminal, and is used to send the flow data to the irrigation control system wirelessly, and is also used to receive a data request instruction sent by the irrigation control system.

[0014] Optionally, the piezoelectric generator is arranged in a steady flow section of the irrigation channel.

[0015] Optionally, the power distribution power supply includes a DC-DC transformer module.

[0016] Optionally, the energy harvesting circuit includes a first-stage circuit and a second-stage circuit, wherein:

[0017] The input end of the first-stage circuit is used as the energy collection end, and the output end is electrically connected to the input end of the second-stage circuit;

[0018] The output end of the second stage circuit is used as the energy output end.

[0019] Optionally, the first-stage circuit includes a first inductor, a first MOS transistor, a first diode and a first capacitor, wherein:

[0020] One end of the first inductor is used as the input end of the first stage circuit and is connected to one end of the piezoelectric generator, and the other end of the first inductor is connected to the anode of the first diode and one end of the first MOS tube;

[0021] The cathode of the first diode is used as the output end of the first stage circuit and is respectively connected to one end of the first capacitor;

[0022] The other end of the first MOS tube is connected to the other end of the piezoelectric generator and the other end of the first capacitor;

[0023] The first MOS transistor is used to perform a switching action based on a control signal of the processor.

[0024] Optionally, the second-stage circuit includes a second inductor, a second MOS transistor, a second diode and a second capacitor, wherein:

[0025] One end of the second inductor is used as the input end of the second stage circuit and is connected to the output end of the first stage circuit, and the other end of the second inductor is connected to the anode of the second diode and one end of the second MOS tube;

[0026] The cathode of the second diode is used as the output end of the second stage circuit and is respectively connected to one end of the second capacitor;

[0027] The other end of the second MOS tube is connected to the other end of the piezoelectric generator and the other end of the second capacitor;

[0028] The second MOS tube is used to perform a switching action based on a control signal of the processor.

[0029] Optionally, a third MOS tube is also included, wherein:

[0030] One end of the third MOS tube is connected to the wireless transmission unit, and the other end is connected to the connection point between the first-level circuit and the second-level circuit. The third MOS tube is configured to be disconnected based on the control signal of the processor when the wireless transmission unit sends data, and to be closed based on the control signal of the processor when the wireless transmission unit is idle.

[0031] Optionally, it also includes an energy storage unit, wherein:

[0032] The energy storage unit is electrically connected to the energy output end of the energy collection unit.

[0033] Optionally, the energy storage unit includes a supercapacitor.

[0034] It can be seen from the above technical solutions that the present application discloses a channel flow measurement device based on energy recovery, which is applied to the irrigation channel of the agricultural irrigation system, and is characterized in that the channel flow measurement device includes a piezoelectric generator, an energy collection circuit, a power distribution power supply, a wireless transmission unit, an ultrasonic probe, an analog front-end unit, a processor and a storage unit. The piezoelectric generator generates electrical energy under the action of water pressure and supplies power to various electrical equipment after being sorted by the energy collection circuit. The processor calculates the flow data based on the water flow velocity signal of the ultrasonic probe at different positions, and sends the flow data to the irrigation control system through the wireless transmission unit to realize the measurement of the flow in the irrigation channel. Through this device, the current flow of water in the channel can be obtained without manual measurement and calculation, thereby improving the measurement efficiency.

[0035] In addition, since the electric energy used by the device comes from an energy recovery system based on water flow pressure, including a piezoelectric generator, an energy collection circuit, a distribution power supply and a wireless transmission unit, it can operate in a field environment without an external power supply, thereby improving its adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 A schematic diagram of a channel flow measurement device based on energy recovery according to an embodiment of the present application;

[0038] Figure 2 This is a schematic diagram of the installation of a piezoelectric generator and an ultrasonic probe according to an embodiment of the present application;

[0039] Figure 3 A structural diagram of a piezoelectric generator according to an embodiment of the present application;

[0040] Figure 4 is an equivalent circuit diagram of a piezoelectric generator according to an embodiment of the present application;

[0041] Figure 5 A circuit diagram of an energy harvesting circuit according to an embodiment of the present application;

[0042] Figure 6 A circuit diagram of another energy harvesting circuit according to an embodiment of the present application;

[0043] Figure 7 A schematic diagram of a power distribution power supply according to an embodiment of the present application;

[0044] Figure 8 A schematic diagram of another channel flow measurement device based on energy recovery according to an embodiment of the present application;

[0045] Fig. 9 This is a working mode diagram of the channel flow measurement device according to an embodiment of the present application;

[0046] Fig.10 Flow chart of the measurement process of the channel flow measurement device according to an embodiment of the present application. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only 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 ordinary technicians in this field without creative work are within the scope of protection of this application.

[0048] Figure 1This is a schematic diagram of a channel flow measurement device based on energy recovery according to an embodiment of the present application.

[0049] like Figure 1 As shown, the channel flow measurement device provided in this embodiment is applied in an irrigation channel to detect the flow in the channel and send the flow data to the nearest wireless base station by wireless means, and the wireless base station sends the flow data to the irrigation control system. The device includes a piezoelectric generator 10, an energy collection circuit 20, a power distribution power supply 2030, a wireless transmission unit 40, an ultrasonic probe 50, an analog front end unit 60, a processor 70 and a storage unit 80.

[0050] The piezoelectric generator is set below the water surface in the irrigation channel, specifically in the steady flow section of the irrigation channel, such as Figure 2 As shown in the figure, multiple layers of piezoelectric generators are evenly arranged from the bottom to the top to collect water pressure energy. The water inlet flare is in the shape of an open trumpet, which plays the role of guiding the water flow. Next to the water inlet is the steady flow section, the main function of which is to regulate the water flow to facilitate the flow measurement of the next stage. The ultrasonic probe is a sensor for measuring flow, which is arranged at intervals from the bottom to the top, mainly located in the flow measurement section of the measuring device structure, and is used to output the detected water flow velocity signal.

[0051] The two ends of the piezoelectric generator are connected to the input end of the energy collection circuit to output the electrical signal generated by the piezoelectric generator under the action of water pressure to the energy collection circuit. Figure 3 Its equivalent circuit is shown as Figure 4 shown.

[0052] The piezoelectric generator is divided into a structural layer, which mainly receives the pressure of the water flow. The electrode + and the electrode - correspond to the positive and negative of the power supply respectively, and the piezoelectric layer is in the middle of the electrode. The outer shell shielding layer is the outer shell of the entire piezoelectric generator. The equivalent circuit of the piezoelectric generator is shown in the figure. After the water flow pressure passes through the piezoelectric generator, it is equivalent to a current source in parallel with a capacitor and an equivalent internal resistance. Through this equivalent circuit, the appropriate circuit and control can be selected in the energy collection circuit to perform energy conversion.

[0053] The energy collection circuit is provided with an energy collection end and an energy output end. The energy collection end is electrically connected to the output end of the piezoelectric generator, and the energy output end is electrically connected to the input end of the power distribution power supply.

[0054] The energy harvesting circuit includes a first-stage circuit and a second-stage circuit. Figure 5 The input end of the first stage circuit is used as an energy collection end, and the other end is used as its output end and connected to the input end of the second stage circuit. The output end of the second stage circuit is used as the energy output end of the energy collection circuit.

[0055] The first-stage circuit includes a first inductor L1, a first MOS transistor M1, a first diode D1, and a first capacitor C1. One end of the first inductor is used as the input terminal of the first-stage circuit, and the other end is electrically connected to the positive electrode of the first diode, one end of the first MOS transistor, specifically the drain or source; the negative electrode of the first diode is used as the output terminal of the first-stage circuit.

[0056] The other end of the first MOS transistor, specifically the source or drain, is connected to the other end of the piezoelectric generator and is also connected to the other end of the first capacitor. The gate of the first MOS transistor is connected to the corresponding port of the processor through a drive circuit, and the control signal output by this port is used to control the opening and closing of the first MOS transistor.

[0057] The second-stage circuit includes a second inductor L2, a second MOS transistor M2, a second diode D2, and a second capacitor C2. One end of the first inductor is used as the input terminal of the second-stage circuit, and the other end is electrically connected to the positive electrode of the second diode, one end of the second MOS transistor, specifically the drain or source; the negative electrode of the second diode is used as the output terminal of the second-stage circuit.

[0058] The other end of the second MOS transistor, specifically the source or drain, is connected to the other end of the piezoelectric generator and is also connected to the other end of the second capacitor. The gate of the second MOS transistor is connected to the corresponding port of the processor through a drive circuit, and the control signal output by this port is used to control the opening and closing of the second MOS transistor.

[0059] The working process of the first-stage circuit includes:

[0060] When the first MOS transistor is in the on state under the control of the processor, the energy generated by the piezoelectric transducer charges the first inductor, and the first inductor stores energy; the first capacitor discharges to provide energy to the load, that is, the second-stage circuit. When the first MOS switch is turned off, the energy transfer process is more complex. The energy transfer among the first inductor, the first capacitor, and the load is closely related to the size of the first inductor. There is a critical inductor LC. When L < LC, the first-stage circuit operates in the discontinuous current mode; when L > LC, the first-stage circuit operates in the continuous current mode.

[0061] When the first-stage circuit operates in the continuous current mode, it can be divided into two stages. When the first MOS transistor is on, it is the energy storage stage of the first inductor. At this time, the power supply does not provide energy to the load, that is, the second-stage circuit, and the second-stage circuit operates by the energy stored in the first capacitor. When the first MOS transistor is blocked, the piezoelectric generator and the inductor jointly supply power to the second-stage circuit and also charge the first capacitor. Here, we need to use a suitable inductor so that the first-stage circuit can operate in the continuous current mode.

[0062] The working principle and mode of the second-stage circuit are the same as those of the first-stage circuit, and will not be elaborated here.

[0063] The input of the second stage circuit also introduces the energy collection of the wireless transmission unit, such as Figure 6 As shown, the antenna of the wireless transmission unit receives the signal transmitted by the base station, and at the same time, the energy is appropriately transformed and sent to the second-stage circuit through the impedance circuit of the third inductor L3, the third capacitor C3 and the fourth capacitor C4. The third MOS tube M3 is used to connect the wireless transmission unit to the input end of the second-stage circuit, and plays the role of collecting energy and receiving signal conversion. When the third MOS tube is turned off, the signal received by the antenna is mainly used for communication, and when the third MOS tube is turned on, it is mainly used for energy collection.

[0064] The distribution power supply is used to supply power to power-consuming units in the channel flow measurement device based on the received electric energy, such as supplying power to the voltage input terminal of the processor, the wireless transmission unit, the ultrasonic probe and other power-consuming devices.

[0065] Since the output voltage of the energy collection unit undergoes two-stage conversion, the voltage fluctuates greatly with changes in the external environment, and its output voltage is 9 to 36 volts. In order to adapt to the different voltage requirements of other electrical equipment, a distribution power supply is required for voltage conversion. The distribution power supply here includes a DC-DC power converter, which is used to convert the fluctuating voltage into a stable 5V, 3.3V, 1.8V for use by the equipment, such as Figure 7 shown.

[0066] The input end of the analog front-end unit is connected to the ultrasonic probe signal, and is used to receive the water flow velocity signal, filter and amplify the water flow velocity signal, and output the filtered and amplified water flow velocity signal to the processor;

[0067] The processor is provided with a signal input terminal, a first data output terminal and a second data output terminal. The signal input terminal is connected to the output terminal of the analog front-end unit for receiving a water flow velocity signal. According to the difference in the state of the ultrasonic probe with water and without water, the approximate submerged position of the water flow can be judged. The flow calculation formula can be selected according to different layers to obtain the flow of the corresponding water layer, and the total flow is obtained by summing the flow of each layer.

[0068] The processor is connected to the storage unit via its first data output terminal, and is used to output the flow data to the memory, so that the memory stores the sequentially generated flow data in a certain data format for subsequent query.

[0069] The second output end of the processor is connected to the wireless transmission unit, which is used to send the flow data to the irrigation control system wirelessly, and is also used to receive the data request instruction sent by the irrigation control system, which is used to control the processor to retrieve the historical flow data from the memory and send it to the irrigation control system. Since the system energy mainly comes from the pressure of the water flow, the wireless transmission unit must have both low power consumption and a long transmission distance. At present, the 5G NB-IOT network is an ideal means.

[0070] It can be seen from the above technical solution that this embodiment provides a channel flow measurement device based on energy recovery, which is applied to the irrigation channel of the agricultural irrigation system, and is characterized in that the channel flow measurement device includes a piezoelectric generator, an energy collection circuit, a power distribution power supply, a wireless transmission unit, an ultrasonic probe, an analog front-end unit, a processor and a storage unit. The piezoelectric generator generates electrical energy under the action of water pressure and supplies power to various electrical equipment after being sorted by the energy collection circuit. The processor calculates the flow data based on the water flow velocity signal of the ultrasonic probe at different positions and sends the flow data to the irrigation control system through the wireless transmission unit to realize the measurement of the flow in the irrigation channel. Through this device, the current flow of water in the channel can be obtained without manual measurement and calculation, thereby improving the measurement efficiency.

[0071] Since the electric energy used by the device comes from an energy recovery system based on water flow pressure, including a piezoelectric generator, an energy collection circuit, a distribution power supply and a wireless transmission unit, it can work in a field environment without an external power supply, thereby improving its adaptability.

[0072] In addition, the device in this embodiment can also be equipped with a corresponding energy storage unit 90, such as Figure 8 As shown. The energy storage unit is used to output the electric energy to the energy storage unit for storage when the electric energy collected by the energy collection circuit exceeds the system's needs, so that the system can output it to the outside when it is underpowered. The energy storage unit can be implemented using a supercapacitor.

[0073] The working mode of the measuring device in this application is as follows Fig. 9 As shown. The working mode of the entire measurement device is divided into 4 stages, sleep mode, energy collection mode, operation mode and shutdown mode. In sleep mode, the processor stops and retains data. This reduces the dynamic current consumption of the processor.

[0074] In energy collection mode, when there is water pressure or wireless signal, the processor controls the MOS tube of the energy collection circuit to perform switching action and detects the voltage on the energy storage unit. After energy collection, the system enters the operation mode.

[0075] In the operation mode, the sensor probe is mainly used to detect the flow. After the collection is completed, the collected data is transmitted through the wireless transmission unit.

[0076] When there is no water pressure energy, the system is in shutdown mode. At this time, the system does not detect the flow rate, but only communicates with the data center through the wireless transmission unit at regular intervals.

[0077] The flow measurement process in the operating mode of this application is as follows Fig.10 As shown. Since the energy collectors of the piezoelectric transformer are evenly distributed on the inner wall of the steady flow section, when water flows through the piezoelectric transformer, the piezoelectric transformer can generate energy, so we can determine the water level according to whether the piezoelectric transformer generates energy.

[0078] According to the water level, the number of layers where the ultrasonic sensor is submerged can be obtained. According to the different number of layers, the flow calculation formula is selected. The instantaneous flow is calculated. After the instantaneous flow is calculated, filtering is required to ensure the smoothness and stability of the output data. Then the flow value is updated, and the next measurement cycle is waited for to arrive, and the next measurement is performed.

[0079] 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.

[0080] It will be appreciated by those skilled in the art that the embodiments of the present invention may be provided as methods, devices, or computer program products. Therefore, the embodiments of the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the embodiments of the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0081] The embodiments of the present invention are described with reference to the flowcharts and / or block diagrams of the methods, terminal devices (systems), and computer program products according to the embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of the processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing terminal device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing terminal device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0082] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing terminal device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0083] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal device so that a series of operating steps are executed on the computer or other programmable terminal device to produce a computer-implemented process, thereby providing instructions for executing on the computer or other programmable terminal device to implement the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0084] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present invention.

[0085] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0086] The technical solution provided by the present invention is introduced in detail above. Specific examples are used in this article to illustrate the principle and implementation mode of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. 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 mode and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A channel flow measurement device based on energy recovery, applied to irrigation channels of agricultural irrigation systems, characterized in that: The channel flow measurement device includes a piezoelectric generator, an energy collection circuit, a power distribution power supply, a wireless transmission unit, an ultrasonic probe, an analog front end unit, a processor and a storage unit, wherein: The piezoelectric generator is arranged below the water surface in the irrigation channel, and the energy collectors of the piezoelectric generator are evenly distributed on the inner wall of the steady flow section of the irrigation channel. When water flows through the piezoelectric generator, the piezoelectric generator can generate energy, so that the processor can determine the water level according to whether the piezoelectric generator generates energy; The energy collection circuit is provided with an energy collection end and an energy output end, the energy collection end is electrically connected to the output end of the piezoelectric generator, and the energy output end is electrically connected to the input end of the power distribution power supply; The power distribution power supply is used to supply power to the power consumption unit in the channel flow measurement device based on the received power energy; The ultrasonic probe is arranged in the irrigation channel and outputs water flow velocity signals reflecting different water layers in the channel; The analog front end unit is connected to the ultrasonic probe signal, and is used to receive the water flow velocity signal, filter and amplify the water flow velocity signal, and output the filtered and amplified water flow velocity signal to the processor; The processor is provided with a signal input terminal, a first data output terminal, and a second data output terminal, the signal input terminal is used to receive the water flow velocity signal, the first data output terminal is used to output flow data, and the second data output terminal is used to output the flow data, the processor is used to obtain the number of layers in which the ultrasonic probe is submerged according to the water level height, and select a flow calculation formula according to different numbers of layers to calculate the flow data; The storage unit is signal-connected to the first data output terminal, and is used to receive and store the flow data; The wireless transmission unit is signal-connected to the second data output terminal, and is used to send the flow data to the irrigation control system wirelessly, and is also used to receive a data request instruction sent by the irrigation control system.

2. The channel flow measurement device according to claim 1, characterized in that: The piezoelectric generator is arranged in the steady flow section of the irrigation channel.

3. The channel flow measurement device according to claim 1, characterized in that: The power distribution power supply includes a DC-DC transformer module.

4. The channel flow measurement device according to claim 1, characterized in that: The energy harvesting circuit comprises a first-stage circuit and a second-stage circuit, wherein: The input end of the first-stage circuit is used as the energy collection end, and the output end is electrically connected to the input end of the second-stage circuit; The output end of the second stage circuit is used as the energy output end.

5. The channel flow measurement device according to claim 4, characterized in that: The first-stage circuit includes a first inductor, a first MOS transistor, a first diode and a first capacitor, wherein: One end of the first inductor is used as the input end of the first stage circuit and is connected to one end of the piezoelectric generator, and the other end of the first inductor is connected to the anode of the first diode and one end of the first MOS tube; The cathode of the first diode is used as the output end of the first stage circuit and is respectively connected to one end of the first capacitor; The other end of the first MOS tube is connected to the other end of the piezoelectric generator and the other end of the first capacitor; The first MOS transistor is used to perform a switching action based on a control signal of the processor.

6. The channel flow measurement device according to claim 4, characterized in that: The second stage circuit includes a second inductor, a second MOS tube, a second diode and a second capacitor, wherein: One end of the second inductor is used as the input end of the second stage circuit and is connected to the output end of the first stage circuit, and the other end of the second inductor is connected to the anode of the second diode and one end of the second MOS tube; The cathode of the second diode is used as the output end of the second stage circuit and is respectively connected to one end of the second capacitor; The other end of the second MOS tube is connected to the other end of the piezoelectric generator and the other end of the second capacitor; The second MOS tube is used to perform a switching action based on a control signal of the processor.

7. The channel flow measurement device according to claim 4, characterized in that: Also includes a third MOS tube, wherein: One end of the third MOS tube is connected to the wireless transmission unit, and the other end is connected to the connection point between the first-level circuit and the second-level circuit. The third MOS tube is configured to be disconnected based on the control signal of the processor when the wireless transmission unit sends data, and to be closed based on the control signal of the processor when the wireless transmission unit is idle.

8. The channel flow measurement device according to claim 1, characterized in that: Also included is an energy storage unit, wherein: The energy storage unit is electrically connected to the energy output end of the energy collection circuit.

9. The channel flow measurement device according to claim 8, characterized in that: The energy storage unit includes a supercapacitor.

Images