Wireless electric energy and information synchronous transmission system capable of resisting coaxial offset

Abstract

The invention relates to an anti-coaxial offset wireless electric energy and information synchronous transmission system, which is characterized by comprising a wireless electric energy transmission channel and a wireless information transmission channel, the wireless electric energy transmission channel comprises a high-frequency full-bridge inverter circuit, a primary side electric energy impedance matching network, a primary side electric energy magnetic coupling mechanism, a secondary side electric energy magnetic coupling mechanism, a secondary side electric energy impedance matching network, a load matching network and a full-bridge rectifier circuit; the wireless information transmission system comprises an information modulation module, a primary side information impedance matching network, a primary side information magnetic coupling mechanism, a secondary side information magnetic coupling mechanism, a secondary side information impedance matching network and an information demodulation module; the information modulation module is connected with the primary information impedance matching network, the primary information impedance matching network is connected with the primary information magnetic coupling mechanism, the primary information magnetic coupling mechanism is coupled with the secondary information magnetic coupling mechanism, and the secondary information magnetic coupling mechanism is connected with the secondary information impedance matching network. And the secondary side information impedance matching network is connected with the information demodulation module.

Description

Technical Field

[0001] The present invention relates to the technical field of downhole equipment, and particularly to a wireless power and information synchronous transmission system resistant to coaxial offset. Background Art

[0002] Currently, brushes and slip rings are the main power transmission methods for downhole intelligent valves. However, this contact-type wired transmission method faces risks such as coil exposure and easy generation of electric sparks. Long-term wear will lead to poor contact and unstable power transmission, severely restricting the stable power supply of rotating equipment. At the same time, while ensuring stable power supply, it is also necessary to meet the transmission of control signals for the opening and closing of intelligent valves. Traditional radio frequency communication technologies are easily interfered with, costly, and have large delays, making it difficult to meet the information transmission requirements of downhole application scenarios. In contrast, wireless power and information synchronous transmission technology is based on the principle of magnetic coupling resonance, avoiding contact between cables, and has the advantages of safety and reliability, and is widely used in multiple fields.

[0003] However, the above advantages are all based on the relative static state of the primary and secondary magnetic coupling mechanisms of the wireless power and information synchronous transmission system. In actual rotating working conditions, due to the disturbance of the external complex environment, the magnetic coupling mechanism inevitably has offset. For the wireless power and information synchronous transmission system, the radial offset has little impact on the mutual inductance and coupling coefficient of the magnetic coupling mechanism. However, under coaxial offset, the mutual inductance and coupling coefficient of the magnetic coupling mechanism change significantly, resulting in a decrease in transmission voltage and efficiency, a decrease in information transmission rate, and a significant deterioration in the stability of the system. Summary of the Invention

[0004] The present invention provides a wireless power and information synchronous transmission system resistant to coaxial offset, which uses DD-solenoid coils and a composite load matching network, and through parameter optimization design, maintains the stability and efficiency of energy and information output under the condition of coaxial offset of the system.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] In a first aspect, the present application provides a wireless power and information synchronous transmission system resistant to coaxial offset, which is characterized by comprising: a wireless power transmission channel and a wireless information transmission channel that are decoupled from each other; wherein,

[0007] The wireless power transmission channel includes a high-frequency full-bridge inverter circuit, a primary-side power impedance matching network, a primary-side power magnetic coupling mechanism, a secondary-side power magnetic coupling mechanism, a secondary-side power impedance matching network, a load matching network, and a full-bridge rectifier circuit; the high-frequency full-bridge inverter circuit is used to connect to a constant-voltage DC power supply and connect to the primary-side power impedance matching network; the primary-side power impedance matching network is connected to the primary-side power magnetic coupling mechanism; the primary-side power magnetic coupling mechanism is coupled with the secondary-side power magnetic coupling mechanism; the secondary-side power magnetic coupling mechanism is connected to the secondary-side power impedance matching network, the secondary-side power impedance matching network is connected to the load matching network, and the load matching network is connected to the full-bridge rectifier circuit; the full-bridge rectifier circuit is used to connect to a load;

[0008] The wireless information transmission system includes an information modulation module, a primary-side information impedance matching network, a primary-side information magnetic coupling mechanism, a secondary-side information magnetic coupling mechanism, a secondary-side information impedance matching network, and an information demodulation module; the information modulation module is connected to the primary-side information impedance matching network, the primary-side information impedance matching network is connected to the primary-side information magnetic coupling mechanism, the primary-side information magnetic coupling mechanism is coupled with the secondary-side information magnetic coupling mechanism, the secondary-side information magnetic coupling mechanism is connected to the secondary-side information impedance matching network, and the secondary-side information impedance matching network is connected to the information demodulation module.

[0009] In one implementation, the primary-side power magnetic coupling mechanism includes a first coil L1 and a third coil L3. The first coil L1 and the third coil L3 are connected to the primary-side impedance matching network, and the internal resistance of the first coil L1 is R L1 , and the internal resistance of the third coil L3 is R L3 ;

[0010] The secondary-side power magnetic coupling mechanism includes a second coil L2 and a fourth coil L4. The second coil L2 and the fourth coil L4 are connected to the secondary-side impedance matching network, and the internal resistance of the second coil L2 is R L2 , and the internal resistance of the fourth coil L4 is R L4 .

[0011] In one implementation, the primary-side power impedance matching network includes a first capacitor C1, a third capacitor C3, and a seventh capacitor C7. The input end of the first capacitor C1 is connected to the high-frequency full-bridge inverter circuit. The first capacitor C1 is connected in series with the first coil L1. The third capacitor C3 is connected in series with the third coil L3. The seventh capacitor C7 is connected in parallel with the third capacitor C3 and the third coil L3. The other end of the first coil L1 is connected to the parallel connection point of the seventh capacitor C7, the third capacitor C3, and the third coil L3. The other parallel connection point of the seventh capacitor C7, the third capacitor C3, and the third coil L3 is connected to the high-frequency full-bridge inverter circuit.

[0012] In one implementation, the secondary-side power impedance matching network includes a second capacitor C2, a fourth capacitor C4, an eighth capacitor C8, and an eighth inductor L8. The second capacitor C2 is in series with the second coil L2. The eighth capacitor C8 is in parallel with the second capacitor C2 and the second coil L2. One end of the parallel connection point of the eighth capacitor C8, the second capacitor C2, and the second coil L2 is connected to the eighth inductor L8. One end of the fourth coil L4 is connected to the fourth capacitor C4, and the other end of the fourth coil L4 is connected to the other end of the parallel connection point of the eighth capacitor C8, the second capacitor C2, and the second coil L2. The other end of the fourth capacitor C4 is connected to the other end of the eighth inductor L8.

[0013] In one implementation, the load matching network includes a first matching inductor LT1, a second matching inductor LT2, and a first matching capacitor CT. One end of the first matching inductor LT1 is connected to the eighth inductor L8. The other end of the first matching inductor LT1 is simultaneously connected to one end of the second matching inductor LT2 and one end of the first matching capacitor CT. The other end of the second matching inductor LT2 is connected to the full-bridge rectifier circuit. The other end of the first matching capacitor CT is simultaneously connected to the fourth coil and the full-bridge rectifier circuit.

[0014] In one implementation, the primary-side information magnetic coupling mechanism includes a fifth coil L5, and the secondary-side information magnetic coupling mechanism includes a sixth coil L6.

[0015] The primary-side information impedance matching network includes a fifth capacitor C5. One end of the fifth capacitor C5 is connected to the information modulation module, and the other end of the fifth capacitor C5 is connected to the fifth coil L5.

[0016] The secondary-side information impedance matching network includes a sixth capacitor C6. One end of the sixth capacitor C6 is connected to the information demodulation module, and the other end of the sixth capacitor C6 is connected to the sixth coil L6.

[0017] In one implementation, the primary-side power magnetic coupling mechanism and the secondary-side power magnetic coupling mechanism constitute a power magnetic coupling mechanism. The primary-side information magnetic coupling mechanism and the secondary-side information magnetic coupling mechanism constitute an information magnetic coupling mechanism. The power magnetic coupling mechanism and the information magnetic coupling mechanism constitute a magnetic coupling mechanism. The magnetic coupling mechanism is composed of a DD coil and a solenoid coil. The DD coil is used for energy transmission, and the solenoid coil is used for information transmission.

[0018] In one implementation, the mutual inductance between the coils of the power magnetic coupling mechanism and the information magnetic coupling mechanism is decoupled.

[0019] The coupling mutual inductance M between the first coil L1 and the second coil L2 in the power magnetic coupling mechanism 12 and the coupling mutual inductance M between the third coil L3 and the fourth coil L4 34, when the magnetic coupling mechanism is offset, M 12 and M 34 satisfy:

[0020] M 12 = aM 34 + b;

[0021] where a and b are parameters that can be obtained by measuring and fitting the mutual inductance of M 12 and M 34 , and M 12 and M 34 show a linear relationship.

[0022] In one implementation, the internal resistances of the four coils of the electric energy magnetic coupling mechanism, and the optimal load R of the composite topology opt are:

[0023]

[0024] where Z M_12 is the impedance of the coupling mutual inductance M 12 between the first coil L1 and the second coil L2, Z M_34 is the impedance of the coupling mutual inductance M 34 between the third coil L3 and the fourth coil L4, and Z L_8 is the impedance of the eighth inductor L8.

[0025] In one implementation, it is characterized in that if the optimal load R opt is not within the actual change range of the load, a load matching circuit is applied to adjust the optimal load. The relationship between the equivalent loads at both ends of the load matching circuit is:

[0026]

[0027] where R hyb is the equivalent load at the input end of the load matching circuit, R out is the equivalent load at the output end of the load matching circuit, and Z T is the impedance of a single arm of the load matching circuit, and it satisfies:

[0028]

[0029] Due to the adoption of the above technical solutions, the present invention has the following advantages:

[0030] 1. When the magnetic coupling mechanism for wireless power and information synchronous transmission has a coaxial offset, the present invention can achieve a constant output independent of the load within an acceptable range through the primary and secondary impedance matching networks, improving the stability and robustness of the system;

[0031] 2. When the coaxial offset occurs in the magnetic coupling mechanism for synchronous wireless power and information transmission of the present invention, the load matching within an acceptable range can be achieved through the load matching circuit, thus achieving efficient power transmission.

[0032] 3. The magnetic coupling mechanism based on the DD-solenoid coil realizes the decoupling of the mutual inductance of the three groups of coils, avoids the cross-disturbance between power and information transmission, and can ensure the stability of power transmission and the efficient transmission of information. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic structural diagram of a wireless power and information synchronous transmission system resistant to coaxial offset in an embodiment of the present invention;

[0034] Figure 2 It is a three-dimensional schematic diagram of the magnetic coupling mechanism in an embodiment of the present invention;

[0035] Figure 3 It is an axial expansion schematic diagram of the magnetic coupling mechanism in an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present invention fall within the scope of protection of the present invention.

[0037] In view of the defects and problems of the prior art, the present application provides a wireless power and information synchronous transmission system resistant to coaxial offset, which is characterized by including: a wireless power transmission channel and a wireless information transmission channel that are decoupled from each other; wherein,

[0038] The wireless power transmission channel includes a high-frequency full-bridge inverter circuit, a primary-side power impedance matching network, a primary-side power magnetic coupling mechanism, a secondary-side power magnetic coupling mechanism, a secondary-side power impedance matching network, a load matching network, and a full-bridge rectifier circuit; the high-frequency full-bridge inverter circuit is used to connect to a constant-voltage DC power supply and connect to the primary-side power impedance matching network; the primary-side power impedance matching network is connected to the primary-side power magnetic coupling mechanism; the primary-side power magnetic coupling mechanism is coupled with the secondary-side power magnetic coupling mechanism; the secondary-side power magnetic coupling mechanism is connected to the secondary-side power impedance matching network, the secondary-side power impedance matching network is connected to the load matching network, and the load matching network is connected to the full-bridge rectifier circuit; the full-bridge rectifier circuit is used to connect to a load;

[0039] The wireless information transmission system includes an information modulation module, a primary-side information impedance matching network, a primary-side information magnetic coupling mechanism, a secondary-side information magnetic coupling mechanism, a secondary-side information impedance matching network, and an information demodulation module; the information modulation module is connected to the primary-side information impedance matching network, the primary-side information impedance matching network is connected to the primary-side information magnetic coupling mechanism, the primary-side information magnetic coupling mechanism is coupled with the secondary-side information magnetic coupling mechanism, the secondary-side information magnetic coupling mechanism is connected to the secondary-side information impedance matching network, and the secondary-side information impedance matching network is connected to the information demodulation module.

[0040] The above modules will be described in a more detailed embodiment in combination with more drawings, and their effects will be described.

[0041] Detailed Embodiment

[0042] This embodiment discloses a wireless power and information synchronous transmission system resistant to coaxial offset. As Figure 1 shown, the device includes two parts: a wireless power transmission channel and a wireless information transmission channel that are decoupled from each other; the wireless power transmission channel includes a high-frequency full-bridge inverter circuit, a primary-side power impedance matching network, a primary-side power magnetic coupling mechanism, a secondary-side power magnetic coupling mechanism, a secondary-side power impedance matching network, a load matching network, and a full-bridge rectifier circuit; the wireless information transmission channel includes an information modulation module, a primary-side information impedance matching network, a primary-side information magnetic coupling mechanism, a secondary-side information magnetic coupling mechanism, a secondary-side information impedance matching network, and an information demodulation module; the high-frequency full-bridge inverter circuit is connected to a constant-voltage DC power supply, the high-frequency full-bridge inverter circuit is connected to the primary-side power impedance matching network, the primary-side power impedance matching network is connected to the primary-side power magnetic coupling mechanism, the secondary-side power magnetic coupling mechanism is connected to the secondary-side power impedance matching network, the secondary-side power impedance matching network is connected to the load matching network, the load matching network is connected to the full-bridge rectifier circuit, and the full-bridge rectifier circuit is connected to the load; the information modulation module is connected to the primary-side information impedance matching network, the primary-side information impedance matching network is connected to the primary-side information magnetic coupling mechanism, the secondary-side information magnetic coupling mechanism and the secondary-side information impedance matching network, and the secondary-side information impedance matching network and the information demodulation module.

[0043] The primary-side power magnetic coupling mechanism includes a first coil L1 and a third coil L3. The first coil L1 and the third coil L3 are connected to the primary-side impedance matching network, where the internal resistance of the first coil L1 is R L1 , and the internal resistance of the third coil L3 is R L3 .

[0044] The secondary-side power magnetic coupling mechanism includes a second coil L2 and a fourth coil L4. The second coil L2 and the fourth coil L4 are connected to the secondary-side impedance matching network, where the internal resistance of the second coil L2 is R L2 , and the internal resistance of the fourth coil L4 is R L4 .

[0045] The primary-side power impedance matching network includes a first capacitor C1, a third capacitor C3, and a seventh capacitor C7. The input end of the first capacitor C1 is connected to the high-frequency full-bridge inverter circuit. The first capacitor C1 is in series with a first coil L1. The third capacitor C3 is in series with a third coil L3. The seventh capacitor C7 is in parallel with the third capacitor C3 and the third coil L3. The other end of the first coil L1 is connected to the parallel connection point of the seventh capacitor C7, the third capacitor C3, and the third coil L3. The other parallel connection point of the seventh capacitor C7, the third capacitor C3, and the third coil L3 is connected to the high-frequency full-bridge inverter circuit.

[0046] The secondary-side power impedance matching network includes a second capacitor C2, a fourth capacitor C4, an eighth capacitor C8, and an eighth inductor L8. The second capacitor C2 is in series with a second coil L2. The eighth capacitor C8 is in parallel with the second capacitor C2 and the second coil L2. The parallel connection point of the eighth capacitor C8, the second capacitor C2, and the second coil L2 is connected to the eighth inductor L8. One end of a fourth coil L4 is connected to the fourth capacitor C4. The other end of the fourth coil L4 is connected to the other parallel connection point of the eighth capacitor C8, the second capacitor C2, and the second coil L2. The other end of the fourth capacitor C4 is connected to the other end of the eighth inductor L8.

[0047] The load matching network includes a first matching inductor L T1 , a second matching inductor L T2 , and a first matching capacitor C T . One end of the first matching inductor L T1 is connected to the eighth inductor L8. The other end of the first matching inductor L T1 is simultaneously connected to one end of the second matching inductor L T2 and one end of the first matching capacitor C T . The other end of the second matching inductor L T2 is connected to the full-bridge rectifier circuit. The other end of the first matching capacitor C T is simultaneously connected to the fourth coil and the full-bridge rectifier circuit.

[0048] The primary-side information magnetic coupling mechanism includes a fifth coil L5.

[0049] The secondary-side information magnetic coupling mechanism includes a sixth coil L6.

[0050] The primary-side information impedance matching network includes a fifth capacitor C5. One end of the fifth capacitor C5 is connected to the information modulation module. The other end of the fifth capacitor C5 is connected to the fifth coil L5.

[0051] The secondary-side information impedance matching network includes a sixth capacitor C6. One end of the sixth capacitor C6 is connected to the information demodulation module. The other end of the sixth capacitor C6 is connected to the sixth coil L6.

[0052] The three-dimensional schematic diagram of the magnetic coupling mechanism is as shown in Figure 2As shown, the axial expansion schematic diagram of the magnetic coupling mechanism is as Figure 3 shown. The primary-side electrical energy magnetic coupling mechanism and the secondary-side electrical energy magnetic coupling mechanism constitute the electrical energy magnetic coupling mechanism. The primary-side information magnetic coupling mechanism and the secondary-side information magnetic coupling mechanism constitute the information magnetic coupling mechanism. The electrical energy magnetic coupling mechanism and the information magnetic coupling mechanism constitute the magnetic coupling mechanism. The magnetic coupling mechanism is composed of a DD coil and a solenoid coil. The DD coil is used for energy transmission, and the solenoid coil is used for information transmission.

[0053] The mutual inductance between the coils of the electrical energy magnetic coupling mechanism and the information magnetic coupling mechanism is decoupled, and the mutual inductance is 0.

[0054] The coupling mutual inductance M between the first coil L1 and the second coil L2 in the electrical energy magnetic coupling mechanism 12 , the coupling mutual inductance M between the third coil L3 and the fourth coil L4 34 , under the condition of magnetic coupling mechanism offset, M 12 and M 34 satisfy:

[0055] M 12 = aM 34 + b;

[0056] where a and b are parameters, which can be obtained by measuring and fitting the mutual inductance of M 12 and M 34 . M 12 and M 34 show a linear relationship.

[0057] The DD coil is made by winding two multi-turn square coils in opposite directions into a ring shape. The solenoid coil is made by helically winding a wire.

[0058] Based on the parameter design method of the magnetic coupling mechanism, the design parameters of the coil are obtained, where the design parameters include wire diameter, coil diameter, coil height, number of turns of the electrical energy magnetic coupling mechanism coil, and number of turns of the information magnetic coupling mechanism coil.

[0059] The parameter design method of the magnetic coupling mechanism includes:

[0060] S1. Based on the given usage environment and size requirements of the magnetic coupling mechanism, determine the coil diameter and coil height, where the coils include the first coil L1, the second coil L2, the third coil L3, the fourth coil L4, the fifth coil L5, and the sixth coil L6;

[0061] S2. Determine the wire diameter according to the magnitude of the power transmitted by electricity;

[0062] S3. Take the number of turns of the electrical energy magnetic coupling structure coil as the optimization variable, simulate and analyze the mutual inductance change rate of the magnetic coupling mechanism under the condition of coaxial offset, and obtain the number of turns of the electrical energy magnetic coupling structure coil corresponding to the minimum change rate;

[0063] S4. With the number of turns of the information magnetic coupling structure coil as the optimization variable, simulate and analyze the mutual inductance change rate of the magnetic coupling mechanism under the condition of coaxial offset, and obtain the number of turns of the information magnetic coupling structure coil corresponding to the minimum change rate.

[0064] Embodiment 2

[0065] Based on the same inventive concept, this embodiment discloses a load matching method for a wireless power and information synchronous transmission system resistant to coaxial offset. Using any one of the above wireless power and information synchronous transmission systems resistant to coaxial offset, it includes the following steps:

[0066] S1. According to the output characteristics of the composite topology, its output voltage gain G is

[0067]

[0068] where Z M_12 is the impedance of the coupling mutual inductance M 12 between the first coil L1 and the second coil L2, Z M_34 is the impedance of the coupling mutual inductance M 34 between the third coil L3 and the fourth coil L4, Z L_7 is the impedance of the seventh inductor L7, Z L_8 is the impedance of the eighth inductor L8, and ω is the working angular frequency of the system;

[0069] Z M_12 、Z M_34 、Z L_7 、Z L_8 are defined as:

[0070] Z M_12 =jωM 12 ;

[0071] Z M_34 =jωM 34 ;

[0072] Z L_7 =jωL7

[0073] Z L_8 =jωL8.

[0074] S2. According to the given output voltage gain G of the load under the offset condition and the maximum gain change range Δ, calculate the impedance Z L_7 of the seventh inductor L7 and the impedance Z L_8 of the eighth inductor L8:

[0075]

[0076] where A = [(1 + Δ)G]-2 , B = -4aZ M_34_0 / G - 2ωb / [(1 + Δ)G], C = 4aZ M_34_0 (4aZ M_34_0 + ωb) + ω 2 b 2 ;

[0077] Z M_34_0 is defined as the impedance of the coupled mutual inductance M 34 when there is no offset.

[0078] S3, calculate the values of other components to satisfy:

[0079]

[0080] S4, obtain the optimal load under the efficient output condition of the composite topology. According to the internal resistances of the four coils of the electromagnetic coupling mechanism, deduce the optimal load R of the composite topology opt is

[0081]

[0082] S5, determine whether it is within the actual change range of the load, then

[0083] apply the load matching circuit to adjust the optimal load R opt to the actual change range of the load to achieve the adjustment of the optimal load. The relationship between the equivalent loads at both ends of the load matching circuit is:

[0084]

[0085] wherein, R hyb is the equivalent load at the input end of the load matching circuit, and R out is the equivalent load at the output end of the load matching circuit, and Z T is the impedance of a single arm of the load matching circuit, and it satisfies:

[0086]

[0087] In several embodiments provided by the present invention, it should be understood that the disclosed method can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the above division of units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point, the displayed or discussed mutual coupling or direct coupling or communication connection can be through some interfaces, and the indirect coupling or communication connection of devices or units can be in electrical, mechanical or other forms.

[0088] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A wireless power and information synchronous transmission system resistant to coaxial offset, characterized in that, Comprising: A wireless power transfer channel and a wireless information transfer channel that are decoupled from each other; wherein, The wireless power transfer channel includes a high-frequency full-bridge inverter circuit, a primary power impedance matching network, a primary power magnetic coupling mechanism, a secondary power magnetic coupling mechanism, a secondary power impedance matching network, a load matching network, and a full-bridge rectifier circuit; The high-frequency full-bridge inverter circuit is used to connect to a constant-voltage DC power supply and connect to the primary power impedance matching network; The primary power impedance matching network is connected to the primary power magnetic coupling mechanism; The primary power magnetic coupling mechanism is coupled to the secondary power magnetic coupling mechanism; The secondary power magnetic coupling mechanism is connected to the secondary power impedance matching network, the secondary power impedance matching network is connected to the load matching network, and the load matching network is connected to the full-bridge rectifier circuit; The full-bridge rectifier circuit is used to connect to the load; The wireless information transfer system includes an information modulation module, a primary information impedance matching network, a primary information magnetic coupling mechanism, a secondary information magnetic coupling mechanism, a secondary information impedance matching network, and an information demodulation module; The information modulation module is connected to the primary information impedance matching network, the primary information impedance matching network is connected to the primary information magnetic coupling mechanism, the primary information magnetic coupling mechanism is coupled to the secondary information magnetic coupling mechanism, the secondary information magnetic coupling mechanism is connected to the secondary information impedance matching network, and the secondary information impedance matching network is connected to the information demodulation module.

2. The wireless power and information synchronous transmission system for resisting coaxial offset according to claim 1, wherein The primary-side electrical magnetic coupling mechanism includes a first coil L1 and a third coil L3. The first coil L1 and the third coil L3 are connected to a primary-side impedance matching network, and the internal resistance of the first coil L1 is R L1 , and the internal resistance of the third coil L3 is R L3 ; The secondary-side electrical energy magnetic coupling mechanism includes a second coil L2 and a fourth coil L4. The second coil L2 and the fourth coil L4 are connected to a secondary-side impedance matching network, and the internal resistance of the second coil L2 is R L2 , and the internal resistance of the fourth coil L4 is R L4 .

3. The wireless power and information synchronous transmission system for resisting coaxial offset according to claim 2, wherein The primary power impedance matching network includes a first capacitor C1, a third capacitor C3, and a seventh capacitor C7, wherein the input end of the first capacitor C1 is connected to the high-frequency full-bridge inverter circuit, the first capacitor C1 is connected in series with a first coil L1, the third capacitor C3 is connected in series with a third coil L3, the seventh capacitor C7 is connected in parallel with the third capacitor C3 and the third coil L3, the other end of the first coil L1 is connected to the parallel connection point of the seventh capacitor C7 with the third capacitor C3 and the third coil L3, and the parallel connection point of the seventh capacitor C7 with the third capacitor C3 and the third coil L3 is connected to the high-frequency full-bridge inverter circuit.

4. The wireless power and information synchronous transmission system for resisting coaxial offset according to claim 3, characterized in that The secondary-side power impedance matching network includes a second capacitor C2, a fourth capacitor C4, an eighth capacitor C8, and an eighth inductor L8. Among them, the second capacitor C2 is connected in series with the second coil L2, and the eighth capacitor C8 is connected to the second capacitor C2 and the second In parallel with coil L2, the eighth capacitor C8 is connected to the eighth capacitor at the parallel connection point of the second capacitor C2 and one end of the second coil L2 inductor L8. One end of the fourth coil L4 is connected to the fourth capacitor C4, and the other end of the fourth coil L4 is connected to the parallel connection point of the eighth capacitor C8 and the other ends of the second capacitor C2 and the second coil L2. The other end of the fourth capacitor C4 is connected to the other end of the eighth inductor L8.

5. The wireless power and information synchronous transmission system for resisting coaxial offset according to claim 4, characterized in that, The load matching network includes a first matching inductor LT1, a second matching inductor LT2, and a first matching capacitor CT, wherein one end of the first matching inductor LT1 is connected to an eighth inductor L8, the other end of the first matching inductor LT1 is simultaneously connected to one end of the second matching inductor LT2 and one end of the first matching capacitor CT, the other end of the second matching inductor LT2 is connected to the full-bridge rectifier circuit, and the other end of the first matching capacitor CT is simultaneously connected to a fourth coil and the full-bridge rectifier circuit.

6. The wireless power and information synchronous transmission system for resisting coaxial offset according to claim 1, wherein The primary information magnetic coupling mechanism includes a fifth coil L5, and the secondary information magnetic coupling mechanism includes a sixth coil L6; The primary information impedance matching network includes a fifth capacitor C5, wherein one end of the fifth capacitor C5 is connected to the information modulation module, and the other end of the fifth capacitor C5 is connected to the fifth coil L5; The secondary information impedance matching network includes a sixth capacitor C6, wherein one end of the sixth capacitor C6 is connected to the information demodulation module, and the other end of the sixth capacitor C6 is connected to the sixth coil L6.

7. The wireless power and information synchronous transmission system for resisting coaxial offset according to claim 6, wherein The primary-side electrical energy magnetic coupling mechanism and the secondary-side electrical energy magnetic coupling mechanism constitute the electrical energy magnetic coupling mechanism. The primary-side information magnetic coupling mechanism and the secondary-side information magnetic coupling mechanism constitute the information magnetic coupling mechanism. The electrical energy magnetic coupling mechanism and the information magnetic coupling mechanism constitute the magnetic coupling mechanism. The magnetic coupling mechanism is composed of a DD coil and a solenoid coil, wherein the DD coil is used for energy transmission and the solenoid coil is used for information transmission.

8. The wireless power and information synchronous transmission system for resisting coaxial offset according to claim 7, characterized in that The mutual inductance between the coils of the electrical energy magnetic coupling mechanism and the information magnetic coupling mechanism is decoupled; The mutual inductance M of coupling between the first coil L1 and the second coil L2 in the electromagnetic coupling mechanism 12 , the mutual inductance M of coupling between the third coil L3 and the fourth coil L4 34 , in the case of the offset of the electromagnetic coupling mechanism, M 12 and M 34 Satisfy: M 12 = aM 34 + b; where a and b are parameters that can be obtained from the mutual inductance measurement and fitting of M 12 and M 34 , and the mutual inductance of M 12 and M 34 shows a linear relationship.

9. The wireless power and information synchronous transmission system for resisting coaxial offset according to claim 8, wherein Internal resistance of the four coils of the electromagnetic coupling mechanism for electric energy, optimal load R of the composite topology opt is as follows: Among them, Z M_12 is the coupling mutual inductance M 12 between the first coil L1 and the second coil L2, and Z M_34 is the coupling mutual inductance M 34 between the third coil L3 and the fourth coil L4, and Z L_8 is the impedance of the eighth inductor L8.

10. The wireless power and information synchronous transmission system for anti-coaxial offset according to claim 8, characterized in that It is characterized in that Optimal load R opt If it is not within the actual change range of the load, a load matching circuit is applied to adjust the optimal load. The relationship between the equivalent loads at both ends of the load matching circuit is as follows: Among them, R hyb is the equivalent load at the input end of the load matching circuit, and R out is the equivalent load at the output end of the load matching circuit. Z T is the impedance of a single arm of the load matching circuit, and it satisfies:

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