A wireless energy information synchronous transmission device with strong decoupling offset adaptability

Abstract

The present invention discloses a wireless power and information synchronous transmission device with strong decoupling offset adaptability. The energy transmitting end is used in cooperation with the energy receiving end; the DC power supply is connected to the inverter circuit, the inverter circuit is respectively connected to the control circuit and the compensation circuit, and the compensation circuit is connected to the energy transmitting coil; the energy receiving coil is connected to the compensation capacitor C3, the compensation capacitor C3 is connected to the rectifying and filtering circuit, the rectifying and filtering circuit is connected to the voltage sensor, the voltage sensor is connected to the current sensor, and the current sensor is connected to the load; the information transmitting end is used in cooperation with the information receiving end; the peripheral processing circuit is connected to the information transmitting coil; the peripheral processing circuit is connected to the information receiving coil. The present invention aims to solve the problems of large interference of energy on information transmission, small transmission power, low information transmission rate, etc. in the existing wireless power transmission system.

Description

Technical Field

[0001] The invention belongs to the field of wireless power transmission, and in particular relates to a wireless power information synchronous transmission device with strong decoupling offset adaptability. Background Art

[0002] Wireless power transmission technology has gotten rid of the traditional wire connection and has obvious technical advantages in the fields of biomedicine, underwater operations, etc., and its future development space is very broad. In actual engineering applications, due to changes in load conditions and environmental conditions, most wireless power transmission devices need to transmit information while realizing power transmission to achieve output voltage feedback control, load detection, status monitoring, multi-controller synchronization and other functions.

[0003] At present, there are two parallel transmission modes of electric energy information: separate channel transmission and shared channel transmission. In the shared channel transmission mode, energy waves and signal waves coexist in the coupling mechanism. The filtering characteristics of the energy resonance circuit (bandpass characteristics of the series type and bandstop characteristics of the parallel type) will weaken the signal carrier. Moreover, as the current of the electric energy transmission loop increases, the pressure on the signal sending and receiving transformers increases, and even the signal carrier is submerged by the electric energy interference, which increases the complexity and difficulty of system design. In addition, the shared channel transmission mode usually adds a high-frequency wave blocker to prevent the signal from entering the energy transmission loop, which will cause a decrease in energy transmission efficiency. This communication technology is only suitable for low-power energy transmission. In the separate channel transmission, the energy transmission coil and the information transmission coil are independent of each other in physical structure, so that the energy transmission channel and the signal transmission channel are isolated from each other in space. In an ideal state, the energy transmission channel only realizes the energy transmission function, and the signal transmission channel only realizes the communication function. However, in practice, it is difficult to keep the relative position between the information transmitting side and the information receiving side constant, especially in dynamic wireless power supply systems. This will lead to increased cross-coupling between the energy coil and the information coil, and put forward higher requirements on the subsequent information demodulation circuit, which is not conducive to the development and popularization of wireless energy information synchronous transmission. Summary of the invention

[0004] The present invention proposes a wireless power information synchronous transmission device with strong decoupling offset adaptability, in order to solve the problems of large interference of energy on information transmission, low transmission power, low information transmission rate and so on in the existing wireless power transmission system; on the basis of realizing synchronous and efficient transmission of electric energy and information, it has strong offset decoupling between the energy coil and the information coil.

[0005] The present invention is achieved through the following technical solutions:

[0006] A wireless energy information synchronous transmission device with strong decoupling offset adaptability, the wireless energy information synchronous transmission device comprising an energy transmission device and an information transmission device; the energy transmission device comprises an energy transmitting end and an energy receiving end, the energy transmitting end is used in conjunction with the energy receiving end;

[0007] The energy transmitting end includes a DC power supply, an inverter circuit, a control circuit, a compensation circuit and an energy transmitting coil 1, wherein the DC power supply is connected to the inverter circuit, the inverter circuit is respectively connected to the control circuit and the compensation circuit, and the compensation circuit is connected to the energy transmitting coil 1;

[0008] The energy receiving end includes an energy receiving coil 3, a compensation capacitor C 3 , a rectifier filter circuit, a voltage sensor, a current sensor and a load, the energy receiving coil 3 and the compensation capacitor C 3 connected, the compensation capacitor C 3 connected to a rectifying and filtering circuit, the rectifying and filtering circuit is connected to a voltage sensor, the voltage sensor is connected to a current sensor, and the current sensor is connected to a load;

[0009] The information transmission device comprises an information transmitting end and an information receiving end, and the information transmitting end is used in conjunction with the information receiving end;

[0010] The information transmitting end includes a peripheral processing circuit D1 and an information transmitting coil 2, and the peripheral processing circuit D1 is connected to the information transmitting coil 2;

[0011] The information receiving end includes a peripheral processing circuit D2 and an information receiving coil 4 , and the peripheral processing circuit D2 is connected to the information receiving coil 4 .

[0012] Furthermore, the energy transmitting coil 1 and the energy receiving coil 3 are symmetrical in structure; the information transmitting coil 2 and the information receiving coil 4 are symmetrical in structure.

[0013] Furthermore, the inverter circuit provides high-frequency alternating current to the energy transmitting coil 1 through the compensation circuit, thereby stimulating a high-frequency alternating magnetic field. The energy receiving coil 3 resonates with the high-frequency alternating magnetic field to generate an induced electromotive force to power subsequent loads.

[0014] Furthermore, the compensation circuit includes an inductor L p1 , capacitor C p1 and capacitor C p2 , the inductance L p1 With capacitor C p1 Parallel resonance, the capacitor C p2 , capacitor C p1 Resonate with the energy transmitting coil 1.

[0015] Furthermore, the energy transmitting coil 1 and the energy receiving coil 3 are both planar circular coils.

[0016] Furthermore, the information transmitting coil 2 is composed of four square coils Coil1, Coil2, Coil3 and Coil4 connected in series, and the current directions of two adjacent square coils are opposite;

[0017] Furthermore, the square coil Coil1 and the square coil Coil2 form a 2D coil 1;

[0018] The square coil Coil3 and the square coil Coil4 form a 2D coil 2;

[0019] The square coils Coil1 and Coil4 form a 2D coil 3;

[0020] The square coils Coil2 and Coil3 form a 2D coil 4 .

[0021] Furthermore, the information transmitting coil 2 and the energy receiving coil 3 are arranged on the same plane;

[0022] The information receiving coil 4 and the energy transmitting coil 1 are arranged on the same plane.

[0023] Furthermore, the energy receiving coil 3 and the capacitor C 3 After being connected in series, the input end of the rectifier and filter circuit is connected, and the output end of the rectifier and filter circuit is connected to the load.

[0024] Furthermore, a magnetic core is provided at the energy transmitting coil 1 and / or the energy receiving coil 3 .

[0025] The beneficial effects of the present invention are:

[0026] 1. The present invention reduces or even eliminates the interference between electric energy and information transmission, improves the stability of power transmission and information transmission when the relative positions of the transmitting side and the receiving side change, and greatly expands the application prospects of wireless power supply technology.

[0027] 2. The energy coil and the information coil of the present invention are placed on the same plane and do not occupy additional space.

[0028] 3. The energy coil and the information coil of the present invention have strong offset decoupling, which improves the flexibility of the device.

[0029] 4. The present invention can realize high-power and high-speed synchronous transmission of electric energy information.

[0030] 5. The present invention realizes reliable transmission of information when the relative positions of the transmitting and receiving sides are offset. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a circuit schematic diagram of the energy transmission device of the present invention.

[0032] Figure 2 It is a circuit schematic diagram of the information transmission device of the present invention.

[0033] Figure 3 It is a schematic diagram of the current direction of the information transmitting coil and the information receiving coil according to a specific embodiment of the present invention.

[0034] Figure 4 It is the opposite-side cross-coupling mutual inductance between the information transmitting coil and the energy transmitting coil in the specific embodiment of the present invention, wherein (a) is a schematic diagram of the offset direction, (b) is the opposite-side cross-coupling mutual inductance offset in the X-axis direction, and (c) is the opposite-side cross-coupling mutual inductance offset in the Y-axis direction.

[0035] Figure 5 These are the offset mutual inductance curves between different information coils and energy coils in a specific embodiment 1, including: (a) DD information coil, (b) 2DD information coils in series, (c) curve of cross-coupling coefficient between DD information coil and energy coil changing with offset, (d) curve of cross-coupling coefficient between 2DD information coils in series and energy coil changing with offset, and (e) curve of cross-coupling coefficient between information coil and energy coil of the present invention changing with offset.

[0036] Figure 6 It is a simulation diagram of a circuit for synchronous transmission of electric energy information according to a specific embodiment 1.

[0037] Figure 7 It is the simulation result of the electric energy and information synchronous transmission circuit of the specific embodiment 1, wherein (a) electric energy output, (b) information output. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] Example 1

[0040] like Figure 1-2 As shown, a wireless energy information synchronous transmission device with strong decoupling offset adaptability, the wireless energy information synchronous transmission device includes an energy transmission device and an information transmission device; the energy transmission device includes an energy transmitting end and an energy receiving end, the energy transmitting end is used in conjunction with the energy receiving end;

[0041] The energy transmitting end includes a DC power supply, an inverter circuit, a control circuit, a compensation circuit and an energy transmitting coil 1, wherein the DC power supply is connected to the inverter circuit, the inverter circuit is respectively connected to the control circuit and the compensation circuit, and the compensation circuit is connected to the energy transmitting coil 1;

[0042] The energy receiving end includes an energy receiving coil 3, a compensation capacitor C 3 , a rectifier filter circuit, a voltage sensor, a current sensor and a load, the energy receiving coil 3 and the compensation capacitor C 3 connected, the compensation capacitor C 3 connected to a rectifying and filtering circuit, the rectifying and filtering circuit is connected to a voltage sensor, the voltage sensor is connected to a current sensor, and the current sensor is connected to a load;

[0043] The information transmission device comprises an information transmitting end and an information receiving end, and the information transmitting end is used in conjunction with the information receiving end;

[0044] The information transmitting end includes a peripheral processing circuit D1 and an information transmitting coil 2, and the peripheral processing circuit D1 is connected to the information transmitting coil 2;

[0045] The information receiving end includes a peripheral processing circuit D2 and an information receiving coil 4 , and the peripheral processing circuit D2 is connected to the information receiving coil 4 .

[0046] Furthermore, the energy transmitting coil 1 and the energy receiving coil 3 are symmetrical in structure; the information transmitting coil 2 and the information receiving coil 4 are symmetrical in structure.

[0047] Furthermore, the inverter circuit provides high-frequency alternating current to the energy transmitting coil 1 through the compensation circuit, thereby stimulating a high-frequency alternating magnetic field. The energy receiving coil 3 resonates with the high-frequency alternating magnetic field to generate an induced electromotive force to power subsequent loads.

[0048] Furthermore, the compensation circuit includes an inductor L p1 , capacitor C p1 and capacitor C p2 , the inductance L p1 With capacitor C p1 Parallel resonance, the capacitor C p2 , capacitor C p1 Resonate with the energy transmitting coil 1.

[0049] Furthermore, the energy transmitting coil 1 and the energy receiving coil 3 are both planar circular coils.

[0050] Further, such as Figure 3As shown, the information transmitting coil 2 is composed of four square coils Coil1, Coil2, Coil3 and Coil4 connected in series, and the current directions of two adjacent square coils are opposite;

[0051] The information transmitting coil 2 and the information receiving coil 4 have the same structure.

[0052] Furthermore, the square coil Coil1 and the square coil Coil2 form a 2D coil 1;

[0053] The square coil Coil3 and the square coil Coil4 form a 2D coil 2;

[0054] The square coils Coil1 and Coil4 form a 2D coil 3;

[0055] The square coils Coil2 and Coil3 form a 2D coil 4 .

[0056] Furthermore, the information transmitting coil 2 and the energy receiving coil 3 are arranged on the same plane;

[0057] The information receiving coil 4 and the energy transmitting coil 1 are arranged on the same plane.

[0058] Furthermore, the energy receiving coil 3 and the capacitor C 3 After being connected in series, the input end of the rectifier and filter circuit is connected, and the output end of the rectifier and filter circuit is connected to the load.

[0059] The electrical signal sensor on the energy receiving coil 3 side is used to measure the current value or voltage value output by the rectifier and filter circuit. The measured current value or voltage value is processed by the peripheral processing circuit as the input signal of the information transmitting coil 2. The signal is transmitted to the information receiving coil 4 through magnetic coupling. The output signal of the information receiving coil 4 is used as the input signal of the inverter control circuit through the peripheral processing circuit, which is used to control the conduction angle of the inverter circuit to output the set voltage value to the load.

[0060] Furthermore, a magnetic core is provided at the energy transmitting coil 1 and / or the energy receiving coil 3 .

[0061] Example 2

[0062] In order to ensure the effectiveness and safety of power transmission, the device often needs to have information transmission while transmitting power. The dual-coupled magnetic communication technology transmits information by adding a pair of communication coils, but there is cross-coupling between the signal coil and the energy coil, which causes great interference to the communication transmission, especially when the energy transmission power is large, the bit error rate of the communication system will be greatly increased. In addition, the relative position between the transmitting side and the receiving side in the actual device is difficult to keep constant, resulting in an increase in cross-coupling. The information transmitting coil 2 and the information receiving coil 4 proposed in this implementation case are respectively composed of two 2D coils, and the coupling between each 2D coil and the energy receiving coil 3 and the energy transmitting coil 1 is equal in magnitude and opposite in polarity, and the information coil and the energy coil are orthogonally decoupled. Furthermore, when offset in the X-axis direction, the square coil Coil1 and the square coil Coil2, the square coil Coil3 and the square coil Coil4 respectively form 2D coil 1 and 2D coil 2, and the coupling between the energy coils cancels each other. When offset in the Y-axis direction, square coil Coil1 and square coil Coil4, square coil Coil2 and square coil Coil3 form 2D coil 3 and 2D coil 4 respectively, and the coupling between the energy coil and the energy coil cancels each other. Due to this decoupling, the net cross coupling between the energy coil and the information coil is 0. Therefore, energy does not interfere with information transmission.

[0063] To further verify the feasibility and effectiveness of the present invention, a simulation model was established based on Ansoft Maxwell simulation software, with a maximum number of iterations of 10, an error requirement of 3%, a 30% encrypted unit ratio for each iteration, and a nonlinear residual of 0.001. The coil simulation parameters are shown in Table 1.

[0064] Table 1 Coil parameters

[0065]

[0066] Usually, before the device is installed, the relative positions of multiple coils on the same side are fixed. In addition, due to the symmetry of the device, only the cross-coupling between the information transmitting coil 2 and the energy transmitting coil 1 on the opposite side is analyzed below. It should be pointed out that the coupling characteristics between the information receiving coil 4 and the energy receiving coil 3 are the same as the coupling characteristics between the information transmitting coil 2 and the energy transmitting coil 1. The mutual inductance between the energy coil and the information coil on the same side is shown in Table 2. When the X-axis direction and the Y-axis direction are offset, the mutual inductance between the information transmitting coil 2 and the energy transmitting coil 1 is as follows Figure 4 shown.

[0067] Table 2 Same-side cross-coupling mutual inductance

[0068]

[0069] As can be seen from Table 2, the coupling between the two 2D coils formed under different combination modes of the square coils and the energy transmitting coil 1 is equal in magnitude and opposite in polarity, and the net coupling is 0, verifying that the device proposed in the present invention can eliminate the cross-coupling between the energy coils and information coils on the same side. Figure 4 As can be seen from (a), when offset in the X direction, the square coil Coil1 and the square coil Coil2, and the square coil Coil3 and the square coil Coil4 respectively form 2D coil 1 and 2D coil 2, and the coupling with the energy transmitting coil 1 cancels each other out. Figure 4 As can be seen from (b), when offset in the Y direction, the square coil Coil1 and the square coil Coil4, and the square coil Coil2 and the square coil Coil3 respectively form 2D coil 3 and 2D coil 4, and the coupling with the energy transmitting coil 1 cancels each other out, verifying that the device proposed in the present invention can eliminate the cross-coupling between the energy coils and information coils on the opposite side. Further, the offset decoupling characteristics of the DD information coil and the series 2DD information coil in the existing research are compared with the present invention, and the results are as Figure 5 shown. Among them, the energy coil structures in different information coil structures are the same, and the wire diameters, number of turns and outer diameters of the information coils are the same. Figure 5 It can be seen that in a large offset range (-50 mm < X < 50 mm, -50 mm < Y < 50 mm), the cross-coupling between the energy coil and the information coil of the device proposed in the present invention remains unchanged and is almost zero, having good decoupling offset adaptability.

[0070] To further verify the feasibility and effectiveness of the present invention, the synchronous transmission of electric energy and information is verified in the pspics simulation software with the coil parameters in Table 1. The circuit schematic diagram is as Figure 6 shown. The information output is taken from the voltage on the compensation capacitor of the information receiving coil 4. At this time, the axial distance between the transmitting side and the receiving side is 200 mm (in the Z-axis direction), the offset distance in the X direction is 50 mm, the load resistance is 30 ohms, and the electric energy output and information output results are as Figure 7 shown.

[0071] From Figure 7 it can be seen that without adding an additional filter circuit and a choke, the device proposed in the present invention realizes the synchronous transmission of electric energy and information. While transmitting a power of 3.3 kW, it realizes an information transmission rate of 50 kbps, and the information transmission is not interfered by the electric energy.

Claims

1. A wireless energy information synchronous transmission device with strong decoupling offset adaptability, characterized in that: The wireless energy information synchronous transmission device includes an energy transmission device and an information transmission device; the energy transmission device includes an energy transmitting end and an energy receiving end, and the energy transmitting end is used in conjunction with the energy receiving end; The energy transmitting end comprises a DC power supply, an inverter circuit, a control circuit, a compensation circuit and an energy transmitting coil (1), the DC power supply is connected to the inverter circuit, the inverter circuit is respectively connected to the control circuit and the compensation circuit, and the compensation circuit is connected to the energy transmitting coil (1); The energy receiving end comprises an energy receiving coil (3), a compensation capacitor C3, a rectifier filter circuit, a voltage sensor, a current sensor and a load, wherein the energy receiving coil (3) is connected to the compensation capacitor C3, the compensation capacitor C3 is connected to the rectifier filter circuit, the rectifier filter circuit is connected to the voltage sensor, the voltage sensor is connected to the current sensor, and the current sensor is connected to the load; The information transmission device comprises an information transmitting end and an information receiving end, and the information transmitting end is used in conjunction with the information receiving end; The information transmitting end comprises a peripheral processing circuit D1 and an information transmitting coil (2), wherein the peripheral processing circuit D1 is connected to the information transmitting coil (2); The information receiving end comprises a peripheral processing circuit D2 and an information receiving coil (4), wherein the peripheral processing circuit D2 is connected to the information receiving coil (4); The information transmitting coil (2) is composed of four square coils Coil1, Coil2, Coil3 and Coil4 connected in series, and the current directions of two adjacent square coils are opposite.

2. The wireless energy information synchronous transmission device according to claim 1, characterized in that: The energy transmitting coil (1) and the energy receiving coil (3) are symmetrical in structure; the information transmitting coil (2) and the information receiving coil (4) are symmetrical in structure.

3. The wireless energy information synchronous transmission device according to claim 1 or 2, characterized in that: The inverter circuit provides high-frequency alternating current to the energy transmitting coil (1) through the compensation circuit, thereby exciting a high-frequency alternating magnetic field. The energy receiving coil (3) resonates with the high-frequency alternating magnetic field to generate an induced electromotive force to supply power to subsequent loads.

4. The wireless energy information synchronous transmission device according to claim 1 or 2, characterized in that: The compensation circuit includes an inductor L p1 , capacitor C p1 and capacitor C p2 , the inductance L p1 With capacitor C p1 Parallel resonance, the capacitor C p2 , capacitor C p1 Resonate with the energy transmitting coil (1).

5. The wireless energy information synchronous transmission device according to claim 2, characterized in that: The energy transmitting coil (1) and the energy receiving coil (3) are both planar circular coils.

6. The wireless energy information synchronous transmission device according to claim 1, characterized in that: The square coil Coil1 and the square coil Coil2 form a 2D coil 1; The square coil Coil3 and the square coil Coil4 form a 2D coil 2; The square coils Coil1 and Coil4 form a 2D coil 3; The square coils Coil2 and Coil3 form a 2D coil 4 .

7. The wireless energy information synchronous transmission device according to claim 1, characterized in that: The information transmitting coil (2) and the energy receiving coil (3) are arranged on the same plane; The information receiving coil (4) and the energy transmitting coil (1) are arranged on the same plane.

8. The wireless energy information synchronous transmission device according to claim 1, characterized in that: The energy receiving coil (3) is connected in series with the capacitor C3 and then connected to the input end of the rectifying and filtering circuit, and the output end of the rectifying and filtering circuit is connected to the load.

9. The wireless energy information synchronous transmission device according to claim 2, characterized in that: The energy transmitting coil (1) and / or the energy receiving coil (3) are provided with a magnetic core.

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