Wireless electric energy and signal simultaneous transmission coupling mechanism and system based on U-shaped magnetic core

Abstract

The invention provides a wireless electric energy and signal simultaneous transmission coupling mechanism and system based on a U-shaped magnetic core. The wireless charging system is used for solving the problems that an existing wireless charging system of the unmanned underwater vehicle is weak in rotation offset resistance and a coupling mechanism is complex in structure. The coupling mechanism comprises a signal receiving coil and an energy receiving coil which are arranged on the cylindrical magnetic core, and two groups of signal transmitting modules and two groups of energy transmitting modules which are fixedly arranged on the outer side of the receiving coil; each signal transmitting module comprises a first U-shaped magnetic core and two signal transmitting sub-coils which are respectively sleeved on two supporting legs of the first U-shaped magnetic core, and each energy transmitting module comprises a second U-shaped magnetic core and two energy transmitting sub-coils which are respectively sleeved on two supporting legs of the second U-shaped magnetic core. The coupling mechanism has 360-degree high rotation offset resistance, and overall mutual inductance stability of energy and signals can be achieved under dynamic rotation offset.

Description

Technical Field

[0001] The invention relates to the field of wireless power transmission, in particular to a wireless power and signal simultaneous transmission coupling mechanism and system based on a U-shaped magnetic core. Background Art

[0002] With its intelligent, high maneuverability and high load capacity, underwater unmanned vehicles are widely used in civil underwater exploration, marine exploration, environmental monitoring, submarine cable maintenance and military operations. However, the endurance of underwater unmanned vehicles is limited by their size and weight and is difficult to improve. The existing energy supply of underwater unmanned vehicles mainly includes manual salvage, that is, the underwater unmanned vehicle automatically floats to the surface when the battery is low, and then is salvaged by a salvage ship for replenishment, but this method is not only costly but also not conducive to the intelligence of underwater unmanned vehicles; in addition, there is also the underwater wet plug-in method, but this method has the problem of low reliability and also requires manual operation; in addition to the difficulty of energy supply, the data collected by the underwater unmanned vehicle can only be collected after salvage and cannot be uploaded in time.

[0003] In response to these problems, wireless power transmission technology based on magnetic coupling has gradually been applied to the design of wireless charging systems for underwater unmanned vehicles. However, the existing wireless charging systems for underwater unmanned vehicles have problems such as weak resistance to rotational offset and complex coupling mechanism structure. In addition, traditional communication methods such as Zig-Bee, Bluetooth and WIFI are difficult to transmit underwater. Summary of the invention

[0004] The purpose of the present invention is to provide a wireless power and signal transmission coupling mechanism and system based on a U-shaped magnetic core, which is used to solve the problems of weak rotation offset resistance and complex coupling mechanism structure in the existing wireless charging system for underwater unmanned vehicles.

[0005] A wireless power and signal simultaneous transmission coupling mechanism based on a U-shaped magnetic core, comprising a signal receiving coil and an energy receiving coil arranged on the outer wall of a cylindrical magnetic core, and two groups of signal transmitting modules and two groups of energy transmitting modules fixedly arranged outside the signal receiving coil and the energy receiving coil;

[0006] The signal transmitting modules all include a first U-shaped magnetic core and two signal transmitting sub-coils respectively mounted on two legs of the first U-shaped magnetic core; the energy transmitting modules all include a second U-shaped magnetic core and two energy transmitting sub-coils respectively mounted on two legs of the second U-shaped magnetic core.

[0007] Optionally, the signal receiving coil and the energy receiving coil are both cylindrical arc coils, and the signal receiving coil and the energy receiving coil are arranged to be rotated 180° along the axis of the cylindrical magnetic core.

[0008] Optionally, the arc angle of the signal receiving coil is 200°, and the arc angle of the energy receiving coil is 192.5°.

[0009] Optionally, the two groups of signal transmission modules and the two groups of energy transmission modules are alternately arranged by rotating 90° in sequence along the axis of the cylindrical magnetic core;

[0010] The two groups of signal transmitting modules and the two groups of energy transmitting modules are both located outside the signal receiving coil and the energy receiving coil.

[0011] Optionally, the two energy transmitting sub-coils are wound in opposite directions, and the energy receiving coil is formed by bending and winding a group of bipolar coils.

[0012] Optionally, the two signal transmitting sub-coils have the same coil winding direction, and the signal receiving coil is formed by bending and winding a unipolar coil.

[0013] Optionally, two signal transmitting sub-coils mounted on the same first U-shaped magnetic core are connected in series to form a signal transmitting coil, and two energy transmitting sub-coils mounted on the same second U-shaped magnetic core are connected in series to form a signal energy transmitting coil.

[0014] A wireless power and signal simultaneous transmission system based on a U-shaped magnetic core comprises the above-mentioned wireless power and signal simultaneous transmission coupling mechanism based on a U-shaped magnetic core.

[0015] Optionally, it also includes a primary side signal transmission circuit and a secondary side signal transmission circuit;

[0016] The input end of the primary signal transmission circuit is connected to the controller, the output end of the primary signal transmission circuit is connected to two groups of signal transmission modules, the input end of the secondary signal transmission circuit is connected to the signal receiving coil, and the output end of the secondary signal transmission circuit is connected to the execution terminal.

[0017] Optionally, it also includes a primary side energy transmission circuit and a secondary side energy transmission circuit;

[0018] The input end of the primary energy transmission circuit is connected to a DC power supply, the output end of the primary energy transmission circuit is connected to two groups of energy transmission modules, the input end of the secondary energy transmission circuit is connected to an energy receiving coil, and the output end of the secondary energy transmission circuit is connected to a load.

[0019] Due to the adoption of the above technical solution, the present invention has the following advantages:

[0020] The coupling mechanism of the present application has a high resistance to 360° rotational offset, and can achieve overall mutual inductance stability of energy and signal under dynamic rotational offset; the structure of the receiving end of the coupling mechanism is simple, which is conducive to the lightweight of the wireless charging system; at the same time, energy and signal are highly decoupled, which can realize parallel transmission of wireless energy and signals at high power.

[0021] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings of the present invention are as follows.

[0023] Figure 1 It is a structural schematic diagram of the coupling mechanism of the present invention.

[0024] Figure 2 This is a graph of the mutual inductance offset of a planar rectangular coil in the simulation of the present invention.

[0025] Figure 3 This is a mutual inductance rotation offset curve diagram when the arc angle of the receiving coil of the present invention is 180°.

[0026] Figure 4 This is a mutual inductance rotation offset curve diagram when the arc angle of the receiving coil of the present invention is 192.5°.

[0027] Figure 5 This is a mutual inductance rotation offset curve diagram of the signal receiving coil of the present invention when the arc angle is 200°.

[0028] In the figure: 1-signal receiving coil; 2-energy receiving coil; 3-first U-shaped magnetic core; 4-signal transmitting coil; 5-second U-shaped magnetic core; 6-energy transmitting coil; 7-cylindrical magnetic core. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0030] Embodiment 1:

[0031] like Figure 1 A wireless power and signal simultaneous transmission coupling mechanism based on a U-shaped magnetic core is shown, comprising a signal receiving coil and an energy receiving coil arranged on the outer wall of a cylindrical magnetic core, and two groups of signal transmitting modules and two groups of energy transmitting modules fixedly arranged outside the signal receiving coil and the energy receiving coil;

[0032] The signal transmitting modules all include a first U-shaped magnetic core 3, and two signal transmitting sub-coils 4 respectively mounted on two legs of the first U-shaped magnetic core 3; the energy transmitting modules all include a second U-shaped magnetic core 5, and two energy transmitting sub-coils 6 respectively mounted on two legs of the second U-shaped magnetic core 5.

[0033] In this embodiment, the current underwater unmanned aerial vehicle has insufficient endurance, high cost of conventional charging methods, low reliability, and difficulty in information exchange. This application is based on the base station docking charging scenario, and both the energy and signal circuits are set in a two-to-one form, that is, two sets of transmitting modules simultaneously transmit energy and signals to the secondary side, so as to achieve mutual inductance stability under rotational offset through its symmetry. Finally, wireless energy and signal parallel transmission with high rotational offset resistance is achieved.

[0034] In this embodiment, the two signal transmitting sub-coils 4 sleeved on the same first U-shaped magnetic core 3 are connected in series, and the signal transmitting sub-coils 4 on the two first U-shaped magnetic cores 3 are connected in series to form signal transmitting coils respectively. dp1 With L dp2 The two energy emitting sub-coils 6 sleeved on the same second U-shaped magnetic core 5 are connected in series. The energy emitting sub-coils 6 on the two second U-shaped magnetic cores 5 are connected in series to form energy emitting coils L. pp1 With L pp2 Define signal receiving coil 1 as L ds , define the energy receiving coil 2 as L ps . Then coil L ds With coil L dp1 and L dp2 Coupling forms a signal transmission loop, coil L ps With coil L pp1 With L pp2 The coupling forms an energy transmission loop.

[0035] like Figure 1 As shown, the signal receiving coil 1 and the energy receiving coil 2 are both cylindrical arc coils, and the signal receiving coil 1 and the energy receiving coil 2 are arranged 180° rotated along the axis of the cylindrical magnetic core 7. Two groups of signal transmitting modules and two groups of energy transmitting modules are arranged alternately 90° rotated along the axis of the cylindrical magnetic core 7;

[0036] The two groups of signal transmitting modules and the two groups of energy transmitting modules are both located outside the signal receiving coil 1 and the energy receiving coil 2 .

[0037] In this embodiment, the two energy transmitting sub-coils 6 on the same first U-shaped magnetic core 3 are wound in opposite directions to generate a magnetic field parallel to the coil plane; the energy receiving coil 2 is formed by a group of bipolar coils that are bent and wound. Thus, it can be coupled with the energy transmitting coil to complete the power transmission. The energy loop generates a magnetic field parallel to the coil through the reverse coil to act on the bipolar coil on the secondary side.

[0038] In this embodiment, the two signal transmitting sub-coils 4 on the same second U-shaped magnetic core 5 have the same coil winding direction to generate a magnetic field perpendicular to the coil plane; the signal receiving coil 1 is formed by bending and winding a unipolar coil, so that it can achieve a high degree of decoupling from the energy circuit while being coupled with the signal transmitting coil, and finally achieve parallel transmission of wireless power and signals. The signal circuit generates a magnetic field perpendicular to the coil through the same direction coil to act on the coil on the secondary side, thereby achieving decoupling of the energy and signal circuits. Compared with the existing wireless charging system, the coupling mechanism of the present application can achieve high rotational offset resistance at 360°, and can achieve a high degree of decoupling of the energy and signal circuits.

[0039] The in and out simulation verification of the above coupling mechanism:

[0040] From the structure and principle of the coupling mechanism, it can be seen that the coupling mechanism is similar to the planar rectangular coupling mechanism, and the rotation offset can correspond to the lateral offset of the plane. Therefore, the variation curve of its mutual inductance with the rotation offset should be the same as Figure 2 In order to achieve the high rotational offset resistance of the coupling mechanism proposed in this application, it is necessary to make the mutual inductance of a single transmitting coil and a receiving coil at the edge of the coil approximately equal to 0.5 times the mutual inductance when the center is facing each other. Based on this, this application first sets the arc angle of the energy receiving coil and the signal receiving coil to 180°, and the mutual inductance changes with the rotation angle as follows: Figure 3 shown. Figure 3 (a) is a graph showing the variation of mutual inductance of the energy transmission circuit with the rotation angle. pp1 、M pp2 Respectively represent the energy transmitting coil is divided into L pp1 and L pp2 With energy receiving coil L ps Mutual inductance, M pp is the total mutual inductance of the energy coil. Figure 3 (b) is a graph showing the change of mutual inductance of the signal transmission loop with the rotation angle, M dd1 、M dd2 Respectively represent the signal transmitting coil is divided into L dp1 and L dp2 With signal receiving coil L ds Mutual inductance, M dd is the total mutual inductance of the signal coil. Figure 3It can be seen that when the arc angle of the receiving coil is 180°, the energy coils have mutual inductance, so that the mutual inductance stability under rotation offset cannot be achieved.

[0041] Finally, through the simulation of different arc angles of the receiving coil, we obtained the following Figure 4 The mutual inductance offset curve shown in Figure 4 (a) is the mutual inductance offset curve of the energy transmission loop mutual inductance changing with the rotation angle. Figure 4 (b) is the mutual inductance offset curve of the signal transmission loop mutual inductance changing with the rotation angle. At this time, the energy receiving coil L ps With signal receiving coil L ds The arc angles are all 192.5°. As can be seen from the figure, the average mutual inductance of the energy coil at this time is 18.95uH, and the mutual inductance fluctuation rate is within ±1%; the average mutual inductance of the signal coil is 6.45uH, but the mutual inductance fluctuation is obvious. Analysis shows that the signal receiving coil is a unipolar coil, which has weaker lateral offset resistance than a bipolar coil, resulting in lower edge mutual inductance, so the arc angle of the signal receiving coil needs to be further optimized.

[0042] Finite element simulation is used to obtain the minimum signal receiving coil L required for mutual inductance stability under rotation offset. ds The radian angle is 200°, and the signal mutual inductance offset curve is as follows: Figure 5 As shown. Figure 5 It can be seen that the average mutual inductance of the signal at this time is 7.23uH, and the mutual inductance fluctuation rate is within ±3%, which means that high offset resistance of 360° rotation is achieved.

[0043] In summary, the coupling mechanism of the present application has a high resistance to 360° rotational offset, and can achieve overall mutual inductance stability of energy and signal under dynamic rotational offset; the structure of the receiving end of the coupling mechanism is simple, which is conducive to the lightweight of the wireless charging system; at the same time, energy and signal are highly decoupled, which can realize parallel transmission of wireless energy and signals at high power.

[0044] Embodiment 2:

[0045] A wireless power and signal simultaneous transmission system based on a U-shaped magnetic core, characterized by comprising the wireless power and signal simultaneous transmission coupling mechanism based on a U-shaped magnetic core described in Example 1.

[0046] It also includes a primary side signal transmission circuit and a secondary side signal transmission circuit;

[0047] The input end of the primary signal transmission circuit is connected to the controller, the output end of the primary signal transmission circuit is connected to two groups of signal transmission modules, the input end of the secondary signal transmission circuit is connected to the signal receiving coil 1, and the output end of the secondary signal transmission circuit is connected to the execution terminal.

[0048] Also includes a primary side energy transmission circuit and a secondary side energy transmission circuit;

[0049] The input end of the primary energy transmission circuit is connected to a DC power supply, the output end of the primary energy transmission circuit is connected to two groups of energy transmission modules, the input end of the secondary energy transmission circuit is connected to the energy receiving coil 2, and the output end of the secondary energy transmission circuit is connected to a load.

[0050] In this embodiment, the primary signal transmission circuit is a signal modulation circuit, and the secondary signal transmission circuit is a signal demodulation circuit. During signal transmission, the controller transmits data to the signal modulation circuit, which is modulated by the modulation circuit and then transmitted to the signal transmitting coil. The signal transmitting coil is coupled with the signal receiving coil to transmit the signal to the rotor side, and then demodulated by the signal demodulation circuit and then transmitted to the execution terminal of the underwater unmanned vehicle for execution. Signal transmission of the underwater unmanned vehicle is realized.

[0051] In this embodiment, the primary energy transmission circuit includes an inverter and a primary compensation circuit connected in sequence, and the secondary energy transmission circuit includes a secondary compensation circuit and a rectifier filter connected in sequence. The primary compensation circuit and the secondary compensation circuit can be symmetrically arranged LC or LCC topology structures. During power transmission, the DC power supply is inverted by the inverter and then transmitted to the primary compensation circuit. The power is transmitted to the energy transmitting coil through the primary compensation circuit. The energy transmitting coil is coupled with the energy receiving coil to transmit the power to the rotor side. The coupled power is then transmitted to the secondary compensation circuit and the rectifier filter in sequence to the load of the underwater unmanned vehicle. The power transmission of the underwater unmanned vehicle is realized.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A wireless power and signal transmission coupling mechanism based on a U-shaped magnetic core, characterized in that: It comprises a signal receiving coil (1) and an energy receiving coil (2) arranged on the outer wall of a cylindrical magnetic core (7), and two groups of signal transmitting modules and two groups of energy transmitting modules fixedly arranged outside the signal receiving coil (1) and the energy receiving coil (2); The signal transmission modules each comprise a first U-shaped magnetic core (3), and two signal transmission sub-coils (4) respectively sleeved on two legs of the first U-shaped magnetic core (3); the energy transmission modules each comprise a second U-shaped magnetic core (5), and two energy transmission sub-coils (6) respectively sleeved on two legs of the second U-shaped magnetic core (5).

2. According to the U-shaped magnetic core-based wireless power and signal transmission coupling mechanism of claim 1, characterized in that: The signal receiving coil (1) and the energy receiving coil (2) are both cylindrical arc coils, and the signal receiving coil (1) and the energy receiving coil (2) are arranged to be rotated 180 degrees along the axis of the cylindrical magnetic core (7).

3. According to claim 2, a wireless power and signal simultaneous transmission coupling mechanism based on a U-shaped magnetic core is characterized in that: The arc angle of the signal receiving coil (1) is 200°, and the arc angle of the energy receiving coil (2) is 192.5°.

4. According to the U-shaped magnetic core-based wireless power and signal simultaneous transmission coupling mechanism of claim 2, characterized in that: The two groups of signal transmission modules and the two groups of energy transmission modules are alternately arranged along the axis of the cylindrical magnetic core (7) and rotated by 90 degrees in sequence; Furthermore, the two groups of signal transmission modules and the two groups of energy transmission modules are both located outside the signal receiving coil (1) and the energy receiving coil (2).

5. The wireless power and signal transmission coupling mechanism based on a U-shaped magnetic core according to claim 1, characterized in that: The coil winding directions of the two energy transmitting sub-coils (6) are opposite, and the energy receiving coil (2) is formed by bending and winding a group of bipolar coils.

6. The wireless power and signal simultaneous transmission coupling mechanism based on a U-shaped magnetic core according to claim 1, characterized in that: The coil winding directions of the two signal transmitting sub-coils (4) are the same, and the signal receiving coil (1) is formed by bending and winding a single polarity coil.

7. The wireless power and signal transmission coupling mechanism based on a U-shaped magnetic core according to claim 1, characterized in that: Two signal transmitting sub-coils (4) sleeved on the same first U-shaped magnetic core (3) are connected in series to form a signal transmitting coil, and two energy transmitting sub-coils (6) sleeved on the same second U-shaped magnetic core (5) are connected in series to form an energy transmitting coil.

8. A wireless power and signal transmission system based on a U-shaped magnetic core, characterized in that: The invention comprises a wireless power and signal simultaneous transmission coupling mechanism based on a U-shaped magnetic core as described in any one of claims 1 to 7.

9. The wireless power and signal transmission system based on a U-shaped magnetic core according to claim 8, characterized in that: It also includes a primary side signal transmission circuit and a secondary side signal transmission circuit; The input end of the primary signal transmission circuit is connected to a controller, the output end of the primary signal transmission circuit is connected to two groups of signal transmission modules, the input end of the secondary signal transmission circuit is connected to a signal receiving coil (1), and the output end of the secondary signal transmission circuit is connected to an execution terminal.

10. The rotation-resistant wireless energy and signal simultaneous transmission system according to claim 8, characterized in that: Also includes a primary side energy transmission circuit and a secondary side energy transmission circuit; The input end of the primary energy transmission circuit is connected to a DC power supply, the output end of the primary energy transmission circuit is connected to two groups of energy transmission modules, the input end of the secondary energy transmission circuit is connected to an energy receiving coil (2), and the output end of the secondary energy transmission circuit is connected to a load.

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