DC Corona Ion Flow Micro-Power Energy Extraction Device, System and Method

Abstract

The present invention provides a micro-power energy harvesting device, system and method based on DC corona ion flow, including a connection conductor connected to a high-potential device, an energy harvesting box connected to the connection conductor, and a corona electrode connected to the energy harvesting box. Among them, the high-potential device is a DC transmission line, and the energy harvesting box includes a filtering module, a control and auxiliary module, and an energy harvesting module; the micro-power energy harvesting device is connected to the DC transmission line by the connection conductor, harvests energy through the DC corona ion flow released by the corona electrode, and uses the energy harvesting box to reduce the electromagnetic interference generated by corona pulses to protect the backend sensing and data transmission devices. The present invention solves the problem that it is difficult for wireless sensors to harvest energy in a DC constant field by utilizing the ion flow generated by the corona loss of high-voltage DC transmission lines, and has the advantages of small volume, flexible placement, stable output, etc., and has strong application prospects.

Description

Technical Field

[0001] The present invention relates to the field of electrical engineering, and in particular to a micro-power energy harvesting device, system and method based on DC corona ion flow. Background Art

[0002] In the process of the power system gradually developing towards large capacity, high voltage and intelligentization, safe and efficient operation has always been the top priority of the work. With the development of modern measurement, control and automation technologies, sensor technology has received extensive attention in the field of power systems.

[0003] At present, traditional sensor devices face great application limitations, while wireless sensors, as the most basic monitoring units, play an irreplaceable role in ensuring the safe and reliable operation of the power grid. With the rise of "digital new infrastructure", the sensor self-powered technology aiming to improve the maintenance-free operation life has increasingly become a research hotspot at home and abroad. The self-powered technology can obtain electricity from the power equipment body or the environment. The current mainstream applications are small-power or micro-power energy harvesting methods such as electric field and magnetic field energy harvesting. This type of method has become the most widely used self-powered technology at present due to its advantages such as simple structure, high reliability and easy application. However, since the energy source is an alternating electric field and magnetic field, it cannot meet the self-powered requirements of sensors in high-voltage DC scenarios. At the same time, to a certain extent, there are also technical defects such as unstable power supply and short life, which will have an adverse impact on the on-line monitoring of transmission lines.

[0004] In summary, there is a lack of a wireless sensor energy harvesting device in the prior art that can stably and safely harvest energy in high-voltage DC scenarios. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a micro-power energy harvesting device based on DC corona ion flow, which utilizes the ion flow generated by the corona loss of high-voltage DC transmission lines to solve the problem that it is difficult for wireless sensors to harvest energy in a DC constant field. It has the advantages of small volume, flexible placement, stable output, etc., and has strong application prospects.

[0006] In a first aspect, an embodiment of the present invention provides a micro-power energy harvesting device based on DC corona ion flow, including: a connection conductor connected to a high-potential device, an energy harvesting box connected to the connection conductor, and a corona electrode connected to the energy harvesting box, wherein the high-potential device includes a DC transmission line, and the energy harvesting box includes a filtering module, a control auxiliary module and an energy harvesting module;

[0007] The micro-power energy harvesting device is connected to the DC transmission line by using the connection conductor, harvests energy through the DC corona ion flow released by the corona electrode, and uses the energy harvesting box to reduce the electromagnetic interference generated by corona pulses to protect the back-end sensing and data transmission devices;

[0008] The connecting conductor includes a metal conductor hook and a wire. The energy-taking box includes a unipolar energy-taking box, and the unipolar energy-taking box includes a first filtering module, a first control auxiliary module, and a first energy-taking module. Among them, the output branch of the first filtering module includes a low-frequency component branch and a high-frequency component branch;

[0009] The first filtering module is connected to the DC transmission line through the metal conductor hook and the wire, and is used to filter out the high-frequency components in the energy-taking current flowing through the metal conductor hook, and provide branch component current for the first control auxiliary module. Among them, the branch component current includes a low-frequency component current for providing a stable reference current for the first control auxiliary module and a high-frequency component current for providing a small-power pulse signal for the first control auxiliary module;

[0010] The first control auxiliary module is respectively connected to the first energy-taking module and the corona electrode, and is used to provide corresponding control signals for the first energy-taking module according to the low-frequency component current;

[0011] The first energy-taking module stores the reference current according to the control signal.

[0012] Combined with the first aspect, the embodiment of the present invention provides a first possible implementation manner of the first aspect. Among them, the connecting conductor includes an insulating rope, the energy-taking box includes a bipolar energy-taking cocoon, the bipolar energy-taking cocoon includes a cocoon-shaped shielding box and an insulating ring, and the cocoon-shaped shielding box includes an upper plate, a lower plate, and a middle plate, and the plates are separated by the insulating ring.

[0013] Combined with the first possible implementation manner of the first aspect, the embodiment of the present invention provides a second possible implementation manner of the first aspect. Among them, the bipolar energy-taking cocoon further includes a second filtering module, a second control auxiliary module, and a second energy-taking module. Among them, the second filtering module is a high-pass filtering capacitor;

[0014] The upper plate is respectively connected to one end of the second control auxiliary module and the high-pass filtering capacitor, the lower plate is respectively connected to the second energy-taking module and the other end of the high-pass filtering capacitor, and the second control auxiliary module and the second energy-taking module are connected to control the storage of electric energy.

[0015] Combined with the first or second possible implementation manner of the first aspect, the embodiment of the present invention provides a third possible implementation manner of the first aspect. Among them, the unipolar energy-taking box is installed on the DC transmission line through the metal conductor hook for energy taking, the bipolar energy-taking cocoon is suspended in the air below the DC transmission line through the insulating rope for suspended energy taking, and the obtained energy is used by the subsequent sensing and data transmission device.

[0016] Combined with the first or second possible implementation manners of the first aspect, the embodiments of the present invention provide a fourth possible implementation manner of the first aspect, wherein the monopolar energy extraction box includes 1 corona point, the bipolar energy extraction cocoon includes 2 corona points, and the positions of the corona points of the bipolar energy extraction cocoon are respectively located at the corona electrodes of the upper plate and the lower plate.

[0017] Combined with the first aspect, the embodiments of the present invention provide a fifth possible implementation manner of the first aspect, wherein the corona electrode is a single-point corona electrode structure or a multi-point corona electrode structure, and the energy extraction box is a monopolar energy extraction box or a bipolar energy extraction cocoon.

[0018] Combined with the fifth possible implementation manner of the first aspect, the embodiments of the present invention provide a sixth possible implementation manner of the first aspect, wherein the multi-point corona electrode structure is a same-polarity multi-point corona generating device.

[0019] In the second aspect, the embodiments of the present invention provide a micro-power energy extraction system based on a DC corona ion flow, including the micro-power energy extraction device based on a DC corona ion flow as described above, and further including a sensing and data transmission device connected to the micro-power energy extraction device.

[0020] The present invention provides a micro-power energy extraction device and system based on a DC corona ion flow, including a connection conductor connected to a high-potential device, an energy extraction box connected to the connection conductor, and a corona electrode connected to the energy extraction box. The high-potential device includes a DC transmission line. The energy extraction box includes a filtering module, a control auxiliary module, and an energy extraction module. The micro-power energy extraction device is connected to the DC transmission line by the connection conductor, extracts energy through the DC corona ion flow released by the corona electrode, and uses the energy extraction box to reduce the electromagnetic interference generated by the corona pulse to protect the subsequent sensing and data transmission device. The present invention utilizes the ion flow generated by the corona loss of the high-voltage DC transmission line to solve the problem that it is difficult for wireless sensors to extract energy in a DC constant field, and has the following advantages: (1) It realizes the utilization of corona loss. (2) It realizes the self-power supply of sensors in high-voltage DC scenarios. (3) The output is stable and safe, reducing the influence of corona pulse electromagnetic interference and protecting the subsequent energy extraction circuit. (4) The installation position is arbitrary, the volume is small, and it can be used immediately after being placed.

[0021] Other features and advantages of the present invention will be described in the subsequent description, and part of them will become obvious from the description, or be understood by implementing the present invention. The objectives and other advantages of the present invention are achieved and obtained by the structures specifically pointed out in the description, the claims, and the drawings.

[0022] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following specifically enumerates preferred embodiments and, in conjunction with the accompanying drawings, provides a detailed description as follows. Description of the Drawings

[0023] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 Schematic diagram of the application scenario of the micro-power energy harvesting device provided by the embodiment of the present invention;

[0025] Figure 2 Schematic diagram of the structure of the unipolar energy harvesting box provided by the embodiment of the present invention;

[0026] Figure 3 Another schematic diagram of the structure of the unipolar energy harvesting box provided by the embodiment of the present invention;

[0027] Figure 4 Schematic diagram of the energy harvesting branch of the unipolar energy harvesting box provided by the embodiment of the present invention;

[0028] Figure 5 Schematic diagram of the structure of the bipolar energy harvesting cocoon provided by the embodiment of the present invention;

[0029] Figure 6 Flowchart of the micro-power energy harvesting method based on direct current corona ion flow provided by the embodiment of the present invention.

[0030] Icons: 1 - Unipolar energy harvesting box; 10 - First shielding box; 11 - First filtering module; 12 - First control auxiliary module; 13 - First energy harvesting module; 14 - Corona electrode; 2 - Bipolar energy harvesting cocoon; 20 - Second shielding box; 21 - Second filtering module; 22 - Second control auxiliary module; 23 - Second energy harvesting module; 24 - Upper electrode plate; 25 - Lower electrode plate; 26 - Intermediate electrode plate; 27 - Insulating ring. Detailed Embodiments

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0032] With the rapid development of the power system, traditional sensor devices face significant application limitations. As the most basic monitoring unit, wireless sensors play an irreplaceable role in ensuring the safe and reliable operation of the power grid. With the rise of "digital new infrastructure", the self-powered technology of sensors aiming to improve the maintenance-free operation life has increasingly become a research hotspot at home and abroad. The self-powered technology can draw power from the power equipment itself or the environment. Currently, the mainstream applications are small-power or micro-power energy harvesting methods such as electric field and magnetic field energy harvesting. Due to advantages such as simple structure, high reliability, and easy application, this type of method has become the most widely used self-powered technology without external power supply. However, since the energy source is alternating electric and magnetic fields, it cannot meet the self-power supply requirements of sensors in high-voltage DC scenarios. At the same time, to a certain extent, there are also technical defects such as unstable power supply and short lifespan, which will have an adverse impact on the on-line monitoring of transmission lines.

[0033] In summary, there is a lack of a wireless sensor energy harvesting device in the prior art that can stably and safely harvest energy in high-voltage DC scenarios. Based on this, the embodiments of the present invention provide a micro-power energy harvesting device, system, and method based on DC corona ion current, which utilize the ion current generated by the corona loss of high-voltage DC transmission lines to solve the problem that it is difficult to harvest energy for wireless sensors in a DC constant field, and has advantages such as small volume, flexible placement, and stable output.

[0034] Figure 1 It is a schematic diagram of the application scenario of the micro-power energy harvesting device provided by the embodiments of the present invention.

[0035] Referring to Figure 1 , the micro-power energy harvesting device based on DC corona ion current includes: a connection conductor connected to a high-potential device, an energy harvesting box connected to the connection conductor, and a corona electrode connected to the energy harvesting box. Among them, the high-potential device includes a DC transmission line, and the energy harvesting box includes a filtering module, a control auxiliary module, and an energy harvesting module;

[0036] The micro-power energy harvesting device is connected to the DC transmission line through the connection conductor, harvests energy through the DC corona ion current released by the corona electrode, and uses the energy harvesting box to reduce the electromagnetic interference generated by corona pulses to protect the backend sensing and data transmission devices. For high-voltage DC transmission lines, a certain amount of corona loss is allowed, which can form an ion current in space. This device utilizes this ion current to solve the problem that it is difficult to construct an energy harvesting circuit due to electrostatic induction caused by the DC constant field.

[0037] Figure 2 and Figure 3Schematic diagrams of the single-pole energy extraction box and the bipolar energy extraction cocoon provided by the embodiments of the present invention. The electric field micro-power energy extraction device in the high-voltage DC scenario proposed in this embodiment can extract energy by installing a single-electrode type energy extraction box on the wire (Embodiment 1), or can be fixed under the wire by an insulating fixing device through a bipolar energy extraction cocoon and extract energy in the air (Embodiment 2). The obtained energy can be used by the backend measurement device, realizing the utilization of corona loss, and is easy to install, providing a convenient research idea for the self-powered problem of DC electric field sensors. To facilitate those skilled in the art to understand the micro-power energy extraction device provided by the embodiments of the present invention, the following will be combined with Figure 2 and Figure 3 as shown, the structures and functions of the single-pole energy extraction box and the bipolar energy extraction cocoon will be described respectively.

[0038] Embodiment 1:

[0039] Referring to Figure 2 , the energy extraction box is a single-pole energy extraction box 1, and the connecting conductors are a metal conductor hook and a wire. The single-pole energy extraction box 1 is installed on the DC transmission line by using components such as a metal conductor hook to extract energy, and the obtained energy can be used by the backend sensing and data transmission device.

[0040] For the first shielding box 10 in the single-pole energy extraction box, it can be connected to the high-potential device (DC transmission line) through a metal conductor hook, and is connected to the energy extraction device through a metal wire via a filtering module. Specifically, the internal circuit functional units of the single-pole energy extraction box mainly include a first filtering module 11, a first control auxiliary module 12, and a first energy extraction module 13. Among them, the output branch of the first filtering module 11 includes a low-frequency component branch and a high-frequency component branch. The connection relationship and working principle between each module will be elaborated below.

[0041] The first filtering module 11 is connected to the DC transmission line through a metal conductor hook and a wire, and is used to filter out the high-frequency components in the energy extraction current flowing through the metal conductor hook and provide branch component current for the first control auxiliary module 12. Among them, the branch component current includes a low-frequency component current for providing a stable reference current for the first control auxiliary module 12 and a high-frequency component current for providing a small-power pulse signal for the first control auxiliary module 12;

[0042] Specifically, the filtering module of the unipolar energy extraction box can effectively filter out the high-frequency components in the energy extraction current, protect the components at the back end from overvoltage, and provide a stable reference current for the auxiliary control module. The output of the filtering module is divided into two branches. Among them, the low-frequency component branch can provide a stable reference current for the control auxiliary module, and the energy extraction branch is used for electrical energy storage; the high-frequency component provides a small-power pulse signal to the control auxiliary module. Briefly speaking, the filtering module outputs the current components separately according to high frequency and low frequency. The low-frequency component flows through the control auxiliary module (which can provide a reference voltage) to the energy extraction branch, and the energy is stored by the energy extraction capacitor; the other branch of the filtering module provides the trigger pulse for the switching element, and thus the purpose of energy extraction is achieved.

[0043] The first control auxiliary module 12 is respectively connected to the first energy extraction module 13 and the corona electrode 14, and is used to provide corresponding control signals for the first energy extraction module according to the low-frequency component current;

[0044] Specifically, the auxiliary control module can provide necessary control signals for the energy extraction branch.

[0045] The first energy extraction module 13 stores the reference current according to the control signal.

[0046] Specifically, as Figure 3 shown, the energy extraction device provided by the embodiment of the present invention is actually realized through a loop formed by the ground-tower-transmission line-shielding box-corona electrode-air-ground. The filtering module and the control auxiliary module actually form a two-port network, and the connection between the filtering module and the control auxiliary module in Figure 3 can be regarded as a port. One side port of it is connected to the DC transmission line and the corona electrode, and the other port is cascaded with the energy extraction branch. The energy extraction branch is also a two-port network, and its other port is connected to the wireless sensor.

[0047] To further facilitate the understanding of the energy extraction device provided by the embodiment of the present invention by those skilled in the art, Figure 4 FIG. is a schematic circuit diagram of the energy extraction branch provided by the embodiment of the present invention. As shown in the figure, it is a two-stage energy extraction loop, and controllable elements such as IGBT (Insulated Gate Bipolar Transistor) are used as switches. The IGBT adopts a pulse control conduction mode, and its pulse is given by the auxiliary control module when the first-stage capacitor (energy extraction capacitor) reaches the preset threshold voltage (the preset threshold voltage is given by the control auxiliary module). The controllable element receives the pulse signal and thus conducts, and the energy is transferred to the energy storage capacitor. The circuit adopts underdamped parameters and can automatically turn off at the current zero crossing, and thus completes the process of charging the energy storage capacitor from the energy extraction capacitor once.

[0048] In order to further improve the energy extraction efficiency, the embodiment of the present invention also provides an adoption such as Figure 2The homopolar multi-point corona generating device shown. The unipolar energy extraction box described in this embodiment includes 1 corona point, but it is not difficult to understand according to the Figure 2 corona electrode positions shown that the corona electrodes can be set as a homopolar multi-point corona generating device, thereby increasing the numerical level of corona ion flow in the space.

[0049] Embodiment 2:

[0050] Referring to Figure 5 , the energy extraction box is a bipolar energy extraction cocoon 2, and the connecting conductor is an insulating fixing device. The main component of the insulating fixing device is an insulating rope, which extracts energy in suspension by setting the energy extraction cocoon in the air below the DC transmission line. The obtained energy can be used by the subsequent sensing and data transmission devices. Since corona itself is only related to the surrounding electric field (direction, magnitude), the bipolar energy extraction cocoon provided in the embodiment of the present invention can reduce the direct connection with the main circuit of the power transmission, improving the safety of the main power transmission equipment.

[0051] Compared with the unipolar energy extraction box provided in the above embodiment, the bipolar energy extraction cocoon is different in its internal circuit connection relationship. The internal circuit functional units of the bipolar energy extraction cocoon mainly include a second filtering module 21, a second control auxiliary module 22, and a second energy extraction module 23. Among them, the second filtering module 21 is a high-pass filtering capacitor; the upper plate 24 is respectively connected to one end of the second control auxiliary module and the high-pass filtering capacitor, the lower plate 25 is respectively connected to the other end of the second energy extraction module and the high-pass filtering capacitor, and the second control auxiliary module 22 and the second energy extraction module 23 are connected to control the storage of electric energy. Compared with the unipolar energy extraction box, the auxiliary control module of the bipolar energy extraction cocoon is first connected in series with the energy extraction branch, and the whole formed by it is connected in parallel with the filtering module and then connected to the corona points on both sides of the device. Among them, the filtering module is essentially a high-pass filtering capacitor.

[0052] For the shielding box of the bipolar energy extraction box, the device is suspended under the high-potential device by an insulating rope. Its upper plate 24, middle plate 26, lower plate 25, and insulating ring 27 together constitute the second shielding box 20, and the plates are separated by the insulating ring 27; both ends of the energy extraction device are respectively connected to the upper and lower plates. Specifically, the mechanical structure of each component of the bipolar energy extraction cocoon mainly includes a spindle-shaped shielding box and an insulating ring. The spindle-shaped shielding box includes an upper plate 24, a lower plate 25, and a middle plate 26, and the plates are separated by the insulating ring 27. The second shielding box 20 of the bipolar energy extraction cocoon preferably has hemispherical upper and lower plates and a cylindrical insulating ring, and such a design can reduce the curvature radius of the second shielding box. According to Figure 6As can be seen from the positions of the corona electrodes shown, the bipolar energy extraction cocoon contains two corona points, and the positions of the corona points of the bipolar energy extraction cocoon are located at the corona electrodes of the upper plate and the lower plate respectively. It should be noted that the shielding box of the unipolar energy extraction box mentioned in the above embodiment has a similar mechanical structure design to that of the bipolar type, and is also a structure combining a hemispherical upper and lower plates and a cylindrical insulating ring to ensure the smoothness and uniformity of the shielding box shell and avoid corona on the shielding box shell.

[0053] Embodiments 1 and 2 of the present invention are only exemplary embodiments. It is not difficult to understand according to the technical solutions provided by the embodiments of the present invention that the energy extraction box of the micro-power energy extraction device can be a unipolar energy extraction box or a bipolar energy extraction box, and its corona electrode can be a single-point corona electrode structure or a multi-point corona electrode structure, and can be selected and designed according to the requirements of the energy extraction site for aspects such as scenarios and efficiency.

[0054] According to an exemplary embodiment of the present invention, the micro-power energy extraction system based on direct-current corona ion flow includes the micro-power energy extraction device based on direct-current corona ion flow as described above, and also includes a sensor device connected to the micro-power energy extraction device, etc.

[0055] Specifically, the power supply of the entire energy extraction device adopts the idea of "long-time charging and short-time discharging". The corona ion flow can be regarded as a current source. By using an energy extraction capacitor with a small capacitance value, the average energy extraction power can be increased, and the energy required for the sensor to work once is accumulated to the energy storage capacitor by discharging successively with a lower capacitor voltage, so as to realize the power supply to the sensor. The sensors at the back end mainly consider the application of non-electromagnetic quantity monitoring, such as the temperature of the switch action contact, the monitoring of the sag of the transmission line (distance from the ground), etc. Among them, the monitoring of the sag of the transmission line (distance from the ground) can be monitored through the energy extraction power level of itself and the action time of the sensor.

[0056] The micro-power energy extraction device based on direct-current corona ion flow provided by the present invention extracts energy by using the corona ion flow generated by the corona electrode, and the shielding box reduces the electromagnetic interference generated by the corona pulse to protect the sensing and data transmission devices at the end. It has the following several advantages:

[0057] (1) It realizes the self-power supply of the sensor under the application scenario of high-voltage direct current. By applying the direct-current corona ion flow, the problem of difficult construction of the energy extraction circuit caused by electrostatic induction caused by the direct-current constant field is solved.

[0058] (2) It realizes the utilization of corona loss. The low-frequency component provides a stable reference current for the control auxiliary module and is stored by the energy extraction branch, and the high-frequency component can be used to provide a pulse trigger signal.

[0059] (3) The output is stable. On the one hand, the influence of corona pulse electromagnetic interference is reduced by the shielding box. On the other hand, the high-frequency components in the current are filtered by the filtering module, protecting the subsequent energy-taking circuit and providing a stable reference current at the same time.

[0060] (4) The installation position is flexible, the volume is small, and it can be used immediately after being placed. The power supply is jointly generated by the high-voltage potential and the corona electrode. The "single-electrode type" energy-taking box device can be installed at the high-voltage equipment or the low-voltage equipment end such as the wire tower pole; it can also be suspended according to the "double-electrode type" energy-taking cocoon.

[0061] Embodiment 3:

[0062] Figure 6 This is the micro-power energy-taking method based on direct-current corona ion flow provided by the embodiment of the present invention.

[0063] Referring to Figure 6 , the micro-power energy-taking method based on direct-current corona ion flow includes:

[0064] Step S101, obtaining the energy-taking current of the direct-current transmission line by using a connecting conductor;

[0065] Step S102, filtering the current through a filtering module to obtain the branch component current, where the branch component current includes the low-frequency component current and the high-frequency component current;

[0066] Step S103, respectively forming a reference current and a small-power pulse signal according to the low-frequency component current and the high-frequency component current, and controlling the corona electrode and the energy-taking module by the control auxiliary module to realize self-energy-taking of the direct-current electric field by using corona loss.

[0067] Specifically, this method can be realized by using a filtering module, an auxiliary control module, and an energy-taking module. The high-frequency components in the energy-taking current are filtered by the filtering module to protect the subsequent components from overvoltage and provide a stable reference current for the auxiliary control module. The output can be divided into two branches. Among them, the low-frequency component branch can provide a stable reference current for the control auxiliary module and be stored by the energy-taking branch; the high-frequency component provides a small-power pulse signal for the control auxiliary module, and the control auxiliary module provides necessary control signals for the energy-taking branch, and then uses the corona ion flow generated by the corona electrode to take energy.

[0068] It should be noted that the micro-power energy-taking method based on direct-current corona ion flow provided by the embodiment of the present invention has the same technical features as the micro-power energy-taking device based on direct-current corona ion flow provided by the above embodiment, so it can also solve the same technical problems and achieve the same technical effects. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0069] Finally, it should be noted that the above-described embodiments are only specific embodiments of the present invention, used to illustrate the technical solutions of the present invention, rather than limiting it. The protection scope of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that any person skilled in the technical field of the present invention can still modify the technical solutions recorded in the foregoing embodiments or can easily think of changes, or perform equivalent replacements on some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A micro-power energy harvesting device based on DC corona ion flow, characterized in that, Including: A connecting conductor connected to a high-voltage device, an energy extraction box connected to the connecting conductor, and a corona electrode connected to the energy extraction box. Wherein, the high-voltage device includes a DC transmission line, and the energy extraction box includes a filtering module, a control auxiliary module, and an energy extraction module; The micro-power energy extraction device is connected to the DC transmission line by the connecting conductor, extracts energy through the DC corona ion flow released by the corona electrode, and uses the energy extraction box to reduce the electromagnetic interference generated by corona pulses to protect the subsequent sensing and data transmission devices; The connecting conductor includes a metal conductor hook and a wire, the energy extraction box includes a unipolar energy extraction box, and the unipolar energy extraction box includes a first filtering module, a first control auxiliary module, and a first energy extraction module. Wherein, the output branch of the first filtering module includes a low-frequency component branch and a high-frequency component branch; The first filtering module is connected to the DC transmission line through the metal conductor hook and the wire, and is used to filter out the high-frequency components in the energy extraction current flowing through the metal conductor hook, and provide branch component current for the first control auxiliary module. Wherein, the branch component current includes a low-frequency component current for providing a stable reference current for the first control auxiliary module and a high-frequency component current for providing a small-power pulse signal for the first control auxiliary module; The first control auxiliary module is respectively connected to the first energy extraction module and the corona electrode, and is used to provide corresponding control signals for the first energy extraction module according to the low-frequency component current; The first energy extraction module stores the reference current according to the control signal.

2. The micro-power energy harvesting device based on DC corona ion flow according to claim 1, characterized in that The connecting conductor includes an insulating rope, the energy extraction box includes a bipolar energy extraction cocoon, the bipolar energy extraction cocoon includes a cocoon-shaped shielding box and an insulating ring, and the cocoon-shaped shielding box includes an upper plate, a lower plate, and an intermediate plate, and the plates are separated by the insulating ring.

3. The micro-power energy harvesting device based on DC corona ion flow according to claim 2, characterized in that, The bipolar energy extraction cocoon further includes a second filtering module, a second control auxiliary module, and a second energy extraction module. Wherein, the second filtering module is a high-pass filtering capacitor; The upper plate is respectively connected to one end of the second control auxiliary module and the high-pass filtering capacitor, the lower plate is respectively connected to the second energy extraction module and the other end of the high-pass filtering capacitor, and the second control auxiliary module and the second energy extraction module are connected to control the storage of electric energy.

4. The micro-power energy harvesting device based on DC corona ion current according to claim 2, characterized in that The unipolar energy extraction box is installed on the DC transmission line through the metal conductor hook to extract energy, and the bipolar energy extraction cocoon is suspended in the air below the DC transmission line through the insulating rope to extract energy, and the obtained energy is all used by the subsequent sensing and data transmission devices.

5. The micro-power energy harvesting device based on DC corona ion flow according to claim 2, characterized in that, The unipolar energy extraction box contains 1 corona point, the bipolar energy extraction cocoon contains 2 corona points, and the positions of the corona points of the bipolar energy extraction cocoon are respectively located at the corona electrodes of the upper plate and the lower plate.

6. The micro-power energy harvesting device based on DC corona ion flow according to claim 1, characterized in that The corona electrode is a single-point corona electrode structure or a multi-point corona electrode structure, and the energy extraction box is a unipolar energy extraction box or a bipolar energy extraction cocoon.

7. The micro-power energy harvesting device based on DC corona ion flow according to claim 6, characterized in that, The multi-point corona electrode structure is a same-polarity multi-point corona generating device.

8. A micro-power energy harvesting system based on DC corona ion current, characterized in that, Comprising the micro-power energy harvesting device based on DC corona ion current according to any one of claims 1 to 7, further comprising a sensing and data transmission device connected to the micro-power energy harvesting device.

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