Noise suppression system of wireless energy and information simultaneous transmission system based on magnetic circuit impedance balance

Abstract

The invention discloses a noise suppression system of a wireless energy and information simultaneous transmission system based on magnetic circuit impedance balance, and belongs to the technical field of power electronics and wireless energy and information simultaneous transmission. The system analyzes system channel characteristics by simplifying an impedance model, realizes impedance balance by adopting a split capacitor and split inductor structure, effectively suppresses noise interference, and meanwhile, improves the noise suppression efficiency. According to the invention, the magnetic circuit optimization design is combined, the split inductor is decoupled, the magnetic integration effect is realized, the system power density is improved, collaborative optimization is carried out from the two dimensions of the circuit and the magnetic circuit, noise suppression and energy transmission efficiency are considered, the method is suitable for various system structures, the engineering application value is high, and the application prospect is wide.

Description

Technical Field

[0001] The present invention belongs to the fields of power electronics and wireless power and signal transmission, and particularly relates to a noise suppression system of a wireless power and signal transmission system based on magnetic circuit impedance balance. Background Art

[0002] With the rapid development of science and technology, electricity demand is increasing dramatically in environments such as underwater, in mines, and outdoors. Wireless power transmission technology, with its contactless nature, enables unattended and mobile power supply, making it a reliable energy supply solution in these challenging environments.

[0003] In practical applications, wireless power transmission systems contain a wealth of electromagnetic interference signals, which pose new challenges to the system's charging performance and control methods. Therefore, for wireless power transmission systems, in addition to establishing a reliable power transmission channel, it is also necessary to pay attention to noise interference. For example, the existing patent document CN 117691763 A discloses "a dual-coupled full-duplex power transmission system", which uses a notch filter unit to suppress the impact of high-frequency multiplication noise in the inverter unit on the communication circuit. Since the notch filter unit requires a high Q value to achieve the filtering function, the capacitance parameter is small, which is not conducive to the design of the main coil (transmitting coil Lp and receiving coil Ls) system and is not suitable for use in high-power wireless power transmission systems.

[0004] Another patent, CN 116260485 A, discloses a "two-stage wireless simultaneous transmission system and method," which can separate the timing of the simultaneous transmission system into a communication transmission protection zone and a prohibited zone. Double-pole double-throw switches are used to adjust the communication transmission time to ensure the reliability of information extraction. However, this solution has a low communication rate and is easily affected by electromagnetic fields in space.

[0005] In summary, the noise suppression part of the trustworthy simultaneous interpretation system still needs to be improved. Summary of the Invention

[0006] In order to solve the above problems, the present invention discloses a noise suppression system for a wireless power communication simultaneous transmission system based on magnetic circuit impedance balance. This system effectively realizes magnetic decoupling between coils, reduces energy loss caused by magnetic coupling, and achieves magnetic circuit integration. It optimizes circuit elements through circuit topology split capacitor and split inductor structure, adjusts the magnetic circuit characteristic impedance of the wireless power communication simultaneous transmission system, and thus suppresses electromagnetic noise caused by magnetic circuit impedance mismatch, thereby significantly improving the quality of communication signals.

[0007] In order to achieve the above object, the technical solution of the present invention is as follows:

[0008] The present invention discloses a noise suppression system for a wireless energy communication simultaneous transmission system based on magnetic circuit impedance balance, comprising a primary transmitting coil module and a secondary magnetic circuit balancing module. The primary transmitting coil module includes an absorbing material, on which an auxiliary ferrite substrate, an auxiliary coil Lp1, an auxiliary ferrite substrate, an auxiliary coil Lp2, a ferrite skeleton, and a transmitting coil Lp are sequentially stacked upward. The secondary magnetic circuit balancing module includes an absorbing material, on which an auxiliary ferrite substrate, an auxiliary coil Lp1, an auxiliary ferrite substrate, an auxiliary coil Lp2, a ferrite skeleton, and a receiving coil Ls are sequentially stacked upward. The auxiliary ferrite substrates are each embedded with ferrite, and the auxiliary ferrite substrates and the ferrite skeleton are distributedly stacked or stacked, with the auxiliary coils Lp1 and Lp2 both positioned within the transmitting coil Lp and the receiving coil Ls.

[0009] This magnetic circuit optimization design facilitates the controllable direction of the magnetic circuit by rationally configuring the stacked or distributed stacking methods of each part, thereby changing the mutual inductance between the auxiliary coils Lp1 / Lp2 and the auxiliary coils Ls1 / Ls2 and the main coils Lp / Ls. This effectively realizes magnetic decoupling between the coils, reduces the energy loss caused by magnetic coupling, and achieves magnetic circuit integration. By designing the circuit topology to realize split capacitor and split inductor structures, the circuit elements are optimized, and the magnetic circuit characteristic impedance of the wireless energy communication system is adjusted, especially in the conducted noise frequency band, thereby suppressing the electromagnetic noise caused by magnetic circuit impedance mismatch and significantly improving the communication signal quality.

[0010] The auxiliary coils Lp1 and Lp2 are designed inside the transmitting coil Lp and receiving coil Ls, respectively, eliminating the need for additional components associated with split inductors. This saves space and helps simplify the circuit system, achieving a high energy density design. This simplifies the problem to how to achieve decoupling between the main coils (transmitting coil Lp and receiving coil Ls) and the auxiliary coils, thereby maintaining the original circuit design and reducing magnetic circuit losses.

[0011] As a further improvement of the present invention, the system further includes a compensation circuit, which includes SS, LCL, and LCC, and calculates the parameters of the split capacitance and split inductance of the coil compensation circuit by using balanced impedance theory.

[0012] Magnetic integration is achieved through magnetic circuit decoupling, and magnetic circuit balance is achieved through a distributed circuit structure, thereby achieving the noise suppression purpose of the simultaneous transmission system. This is not limited to compensation circuit structures such as Series-Series (SS), LCL, and LCC. By designing circuit topology to achieve split capacitors and split inductors, noise suppression of the simultaneous transmission system can be achieved.

[0013] As a further improvement of the present invention, the distributed stacking is to stack the auxiliary coils Lp1 and Lp2 horizontally along the central axis of the transmitting coil Lp and the receiving coil Ls, and adjust the coil sizes to achieve mutual inductance decoupling.

[0014] As a further improvement of the present invention, the stacked arrangement is to stack the auxiliary coils Lp1 and Lp2 vertically along the central axis of the transmitting coil Lp and the receiving coil Ls, and adjust the coil sizes to achieve mutual inductance decoupling.

[0015] As a further improvement of the present invention, the transmitting coil Lp, receiving coil Ls, auxiliary coils Lp1 and Lp2 and auxiliary ferrite substrate are all symmetrical models perpendicular to the central axis, thereby achieving the purpose of distributed capacitance and distributed inductance in the circuit structure.

[0016] As a further improvement of the present invention, the transmitting coil Lp and the receiving coil Ls have the same shape, and are both rectangular or circular structures.

[0017] The noise suppression system of the wireless energy communication simultaneous transmission system based on magnetic circuit impedance balance of the present invention effectively realizes magnetic decoupling between coils, reduces energy loss caused by magnetic coupling, and achieves magnetic circuit integration at the same time. It optimizes circuit elements by realizing split capacitor and split inductor structures through circuit topology, adjusts the magnetic circuit characteristic impedance of the wireless energy communication simultaneous transmission system, and thereby suppresses electromagnetic noise caused by magnetic circuit impedance mismatch, significantly improving the communication signal quality. It can be used in wireless energy communication simultaneous transmission systems of both large and small powers, and has a wide range of applicable scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 (a) Schematic diagram of the wireless simultaneous transmission system architecture based on stacked inductor design;

[0019] Figure 1 (b) Figure 1 (a) Exploded view of the transmitting coil structure on the transmitting side;

[0020] Figure 2 (a) Schematic diagram of the SS structure with no balanced impedance and simultaneous interpretation system;

[0021] Figure 2 (b) is a schematic diagram of the structure of the LCC structure with no balanced impedance and simultaneous interpretation system;

[0022] Figure 2 (c) is a schematic diagram of the structure of the LCL structure with no balanced impedance and simultaneous interpretation system;

[0023] Figure 3 (a) is the distributed capacitance model of the wireless energy communication system;

[0024] Figure 3(b) Simplified analysis model of noise impedance of wireless communication system;

[0025] Figure 4 (a) is the common mode noise analysis model of the wireless communication system;

[0026] Figure 4 (b) A simplified analysis model of the common-mode noise channel of a wireless communication and simultaneous transmission system;

[0027] Figure 5 A simplified circuit model of a universal channel for wireless simultaneous transmission systems;

[0028] Figure 6 (a) LCC, LCL, and SS structures without balanced impedance;

[0029] Figure 6 (b) LCC, LCL, and SS structures with balanced impedance;

[0030] Figure 7 (a) Noise suppression analysis of LCC structures with and without balanced impedance;

[0031] Figure 7 (b) Noise suppression analysis of LCL structures with and without balanced impedance;

[0032] Figure 7 (c) Analysis of SS structure noise suppression with and without balanced impedance;

[0033] Figure 8 (a) (b) Impedance analysis of unbalanced compensation circuit and balanced compensation circuit under LCC compensation;

[0034] Figure 8 (c) (d) Impedance analysis of unbalanced compensation circuit and balanced compensation circuit under LCL compensation;

[0035] Figure 8 (e) (f) Impedance analysis of unbalanced compensation circuit and balanced compensation circuit under SS compensation;

[0036] Figure 9 (a) Schematic diagram of electromagnetic simulation model of the magnetic integration scheme of laminated auxiliary coils;

[0037] Figure 9 (b) Schematic diagram of the electromagnetic simulation model of the distributed auxiliary coil magnetic integration scheme. DETAILED DESCRIPTION

[0038] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0039] like Figure 1As shown in (a) and (b), the noise suppression system of the wireless energy communication simultaneous transmission system based on magnetic circuit impedance balance disclosed in the present invention is composed of a primary transmitting coil module and a secondary magnetic circuit balance module, the primary transmitting coil module includes an absorbing material, on which an auxiliary ferrite substrate, an auxiliary coil Lp1, an auxiliary ferrite substrate, an auxiliary coil Lp2, a ferrite skeleton and a transmitting coil Lp are stacked upward in sequence, the secondary magnetic circuit balance module includes an absorbing material, on which an auxiliary ferrite substrate, an auxiliary coil Lp1, an auxiliary ferrite substrate, an auxiliary coil Lp2, a ferrite skeleton and a receiving coil Ls are stacked upward in sequence, the auxiliary ferrite substrates are all embedded with ferrite, the auxiliary ferrite substrates and the ferrite skeleton are distributedly stacked or stacked, and the two auxiliary coils Lp1 and Lp2 are both placed inside the transmitting coil Lp and the receiving coil Ls.

[0040] This magnetic circuit optimization design facilitates the controllable direction of the magnetic circuit by rationally configuring the stacked or distributed stacking of each part, thereby changing the mutual inductance between the auxiliary coils Lp1 / Lp2 and the auxiliary coils Lp1 / Lp2 and the main coils Lp / Ls. This effectively achieves magnetic decoupling between the coils, reduces the energy loss caused by magnetic coupling, and achieves magnetic circuit integration. It uses split capacitor and split inductor structures to optimize circuit elements and adjust the magnetic circuit characteristic impedance of the wireless energy transmission system, especially in the conducted noise frequency band, thereby suppressing electromagnetic noise caused by magnetic circuit impedance mismatch and significantly improving communication signal quality.

[0041] The auxiliary coils Lp1 and Lp2 are designed inside the transmitting coil Lp and receiving coil Ls, respectively, eliminating the need for additional components associated with split inductors. This saves space and facilitates high energy density design. The problem is simplified to how to achieve decoupling between the main coils (transmitting coil Lp and receiving coil Ls) and the auxiliary coils to maintain the original circuit design and reduce magnetic circuit losses.

[0042] The following is a brief description of the two stacking methods. Figure 9 As shown in (b), the distributed stacking is to stack the auxiliary coils Lp1 and Lp2 horizontally along the central axis of the transmitting coil Lp and the receiving coil Ls, and adjust the coil size to achieve mutual inductance decoupling, as shown in Figure 9 As shown in (a), the stacked arrangement is to stack the auxiliary coils Lp1 and Lp2 vertically along the central axis of the transmitting coil Lp and the receiving coil Ls, and adjust the coil sizes to achieve mutual inductance decoupling.

[0043] The system includes a compensation circuit. For high-power wireless simultaneous transmission systems, the common compensation circuit structure is as follows: Figure 2(a)(b)(c) show the wireless energy transfer (IPT) system structures of the three compensation circuits: SS, LCL, and LCC. The figures show the system structure schematics when the three compensation circuits have unbalanced impedance.

[0044] Noise suppression principle of wireless energy signal transmission system based on balanced impedance

[0045] The transmitting coil in the IPT system serves as the "power output port" of the IPT system. Its design directly affects the magnetic field strength and transmission distance. The receiving coil serves as the "power input port" of the IPT system. Its efficiency determines the final available power. The parasitic capacitance generated between the two provides a path for common-mode noise, as shown in Equation (1-1):

[0046] (1-1)

[0047] Generally, the self-inductance of each winding is proportional to its number of turns, capacitance, and length. This means that in an IPT system's transmitting coil, the inductance and distributed capacitance to ground are unequal for each turn, resulting in unequal CM impedance across the coil. To address this issue, a distributed coil model is proposed, which considers the transmitting coil as a series coupling of multiple coil units. Each coil unit has self-inductance, distributed capacitance to ground, and mutual inductance.

[0048] Take the two-distribution model as an example to illustrate the asymmetric characteristics of the coil used in the IPT system. The N turns of the transmitting coil are equivalent to the outer coil N / 2 turns L tx1 With inner ring N / 2 turns L tx2 The series coupling of the IPT transmitting coil and the asymmetric common mode impedance model are as follows: Figure 1 As shown in Table 1, the measured values of the parameters of the dichotomous model are shown in Table 1.

[0049] Table 1 Parameter measurement values in the two-distributed coil model

[0050]

[0051] In the wireless energy signal transmission system, the longitudinal axis distance between the transmitting coil and the receiving coil is large, and the parasitic capacitance Ctr1-4 between the two is relatively small and can be ignored. Figure 3 As shown in (a) and 3(b), the CM impedance Z at the upper (outer) and lower (inner) ends of the transmitting coil to ground coila and Z coilb It can be deduced from formulas (1-2) and (1-3):

[0052] (1-2)

[0053] (1-3)

[0054] Simplifying equations (1-2) and (1-3) we can get the CM impedance Z coila and Z coilb The analytical expressions are shown in (1-4) and (1-5):

[0055] (1-4)

[0056] (1-5) in, .

[0057] The Line Impedance Stabilization Network (LISN) can isolate radio interference, provide stable test impedance, and act as a filter. It is an important auxiliary equipment in the electromagnetic compatibility test of power equipment. To test the common mode noise suppression capability of the IPT system, its input voltage terminal is connected to the LISN, and a CM noise model is established. Figure 4 shown.

[0058] C inv1 and C inv2 is the parasitic capacitance between the power switch and the heat sink, which are approximately equal in value, approximately 200pF. A variety of compensation networks can be used on the primary side of the IPT system, such as LCC, LCL, and SS circuits. Considering that CM noise is high-frequency, the inductor and capacitor in the noise model can be considered open and short circuits, respectively. Draw a blue dashed line to depict the CM noise path, as shown in Figure 1. Figure 4 According to this path, the CM noise model is simplified, and the LISN is regarded as a 25Ω resistor. The simplified circuit is as follows: Figure 4 As shown in (b), the CM impedances of the two bridge arms of the inverter to the ground through the primary side of the IPT are Z ina and Z inb .

[0059] CM noise is mainly caused by displacement current flowing through high dv / dt nodes and parasitic capacitance between these nodes and the ground. Therefore, a common-mode noise current source can be used to replace the high dv / dt node. inv1 and C inv2 Relative Z ina and Z inb The impedance is extremely large, so when solving Z ina and Z inb can be ignored. Further simplification Figure 4 (b) and plot the common-mode current noise and pathways, such as Figure 5 shown.

[0060] because and Respectively Figure 4 (a) The switching noise of S2 and S4, so the two have a 180° phase difference. If the two bridge arms of the inverter are balanced by the CM impedance of the primary side of the IPT to ground, that is, , then the common mode noise can be offset. Based on this impedance balance idea, balanced compensation circuits are designed for LCC, LCL and SS topologies, as shown in Figure 6 (a) and 6(b),

[0061] (1) For unbalanced compensation LCC structure:

[0062] Resonant inductor L f1 The resonant capacitor C1 only exists on one output bridge arm of the inverter, and the unbalanced impedance and As shown in formula (1-6):

[0063] (1-6)

[0064] In order to achieve CM impedance balance, the compensation network structure needs to be optimized and the resonant inductor L f1 Divided into L f1a 、L f1b Two parts, the resonant capacitor C1 is divided into C 1a 、C 1b Two parts, and scattered on two branches, C f1 Used as a differential element, its impact on CM impedance is ignored. At this time, the impedance is balanced. and As shown in formula (1-7):

[0065] (1-7)

[0066] In order to ensure that the balanced impedance is equal and the resonant inductance and capacitance remain unchanged, equation (1-8) must hold:

[0067] (1-8)

[0068] A set of feasible solutions that satisfy equation (1-8) is given as follows:

[0069] (1-9)

[0070] (2) For the LCL structure, analogy with the LCC analysis process:

[0071] Resonant inductor L in asymmetric compensation circuit f2 It only exists on one output bridge arm of the inverter. In order to achieve CM impedance balance, the resonant inductor L f2 Divided into L f2a 、L f2bTwo parts, and scattered on two branches, C f2 Used as a differential element, its effect on CM impedance is ignored. Unbalanced impedance and and balanced impedance and As shown in formulas (1-10) and (1-11) respectively:

[0072] (1-10)

[0073] (1-11)

[0074] In order to achieve equal balanced impedance and ensure that the resonant inductance and capacitance remain unchanged, equation (1-12) is required to hold:

[0075] (1-12)

[0076] A set of feasible solutions that satisfy equation (1-12) is given as follows:

[0077] (1-13)

[0078] Among them, there are Get established.

[0079] (3) For SS structure:

[0080] In the asymmetric compensation circuit, the resonant capacitor C3 only exists on one output bridge arm of the inverter. In order to achieve CM impedance balance, the resonant capacitor C3 is divided into C 3a 、C 3b Two parts, and distributed in two branches. Its unbalanced impedance and and balanced impedance and As shown in formulas (1-14) and (1-15) respectively:

[0081] (1-14)

[0082] (1-15)

[0083] In order to ensure that the balanced impedance is equal and the resonant inductance and capacitance remain unchanged, the formula (1-16) is required to be established:

[0084] (1-16)

[0085] A set of feasible solutions that satisfy equation (1-16) is given as follows:

[0086] (1-17)

[0087] Solving the system of equations (1-17), we find and There is a real number solution only below 350kHz, and the SS structure does not have a balanced resonant inductor to make its CM impedance equal at high frequencies. Therefore, the SS structure balanced compensation circuit can only achieve CM impedance balance near 350kHz. For high frequencies (>1MHz), CM impedance equality cannot be achieved, making it difficult to suppress high-frequency CM noise.

[0088] Depend on Figure 4 (b) It can be obtained that the common-mode noise current of S2 is Common mode noise current with S4 As shown in formula (1-18):

[0089] (1-18)

[0090] (4) Solve the characteristic impedance of the channel according to the superposition theorem:

[0091] The total CM current noise flowing through the 25Ω resistor in the LISM device is and The sum of superposition is shown in formula (1-19):

[0092] (1-19)

[0093] When the CM impedance of the two bridge arms of the inverter is balanced, that is, hour, can be eliminated. At this time, the system CM current noise The voltage source is defined as .pass , simplify to get CM impedance Z CM The expression is:

[0094] (1-20)

[0095] Design of distributed inductor structure based on magnetic integration model

[0096] Based on the first part, split capacitors and split inductors are used to achieve noise suppression in the energy-signaling simultaneous transmission system. However, considering that split inductors will increase the use of devices, occupy space, and increase the complexity of the entire system, which is not conducive to achieving the goal of high energy density design, it is considered to design the auxiliary coils (Lp1, Lp2) inside the main coils (transmitting coil Lp and receiving coil Ls), thereby simplifying the problem to how to achieve decoupling between the main coils (transmitting coil Lp and receiving coil Ls) and the auxiliary coils to maintain the original circuit design and reduce magnetic circuit losses.

[0097] The structure needs to meet the following design requirements:

[0098] (1) Mutual inductance M between the auxiliary coils (Lp1, Lp2) and the main coils (transmitting coil Lp and receiving coil Ls) p1 、M s1 、M ps1 and M sp1 The mutual inductance is approximately 0, and the transmission properties of the main coils (transmitting coil Lp and receiving coil Ls) are maintained;

[0099] (2) In the case of coil offset, M p1 、M s1 、M ps1 and M sp1 The mutual inductance is approximately 0, ensuring that there will be no crosstalk in the event of displacement.

[0100] (3) Since the auxiliary coils (Lp1, Lp2) are behind the main coils (transmitting coil Lp and receiving coil Ls), it is necessary to test the mutual inductance crosstalk effect of the improved model.

[0101] Based on adjusting the position relationship between the auxiliary ferrite substrate and the ferrite skeleton, the mutual inductance decoupling is achieved. It can be divided into two structures: distributed stacking and layered stacking. The so-called distributed stacking is to stack the auxiliary coils horizontally along the central axis of the main coil. By adjusting the coil size, the mutual inductance decoupling is achieved. Figure 9 (b) As shown; the so-called stacking is to stack the auxiliary coils vertically along the central axis of the main coil to achieve mutual inductance decoupling, as shown in Figure 9 As shown in (a).

[0102] From the above two parts, it can be seen that the noise suppression system of the simultaneous interpretation system based on magnetic circuit impedance balance disclosed by the present invention adjusts the circuit structure and uses split capacitors and split inductors to achieve the function of magnetic circuit impedance balance, thereby suppressing the conducted noise of the simultaneous interpretation system.

[0103] The magnetic circuit impedance balancing principle of the magnetic integrated type is as follows:

[0104] Through the positional relationship of the ferrite skeleton, such as stacked and distributed, by changing the direction of the magnetic circuit, the mutual inductance value between the coils is affected, and the decoupling between the auxiliary coils and the auxiliary coils, and the auxiliary coils and the main coil is achieved, thereby realizing magnetic circuit integration and reducing energy loss caused by magnetic coupling.

[0105] By adjusting the circuit elements and the circuit structure (split capacitor, split inductor structure), the magnetic circuit characteristic impedance of the wireless energy transmission system within the conducted noise range is improved, thereby reducing the impact of electromagnetic noise caused by the magnetic circuit impedance on the communication system.

[0106] In this embodiment, the transmitting part and the receiving part are not electrically connected, and energy is transmitted only through the magnetic field.

[0107] Formulas (1-9), (1-13), and (1-17) can be used to calculate the calculation schemes for split capacitance and split inductance respectively. Taking the data given in Table 1 as an example, the capacitance and inductance values required for the balanced impedance design of the three structures of SS, LCL, and LCC can be calculated. The calculation results are recorded in Table 2-4.

[0108] Table 2 SS unbalanced and balanced compensation circuit parameter design

[0109]

[0110] Table 3 LCL unbalanced and balanced compensation circuit parameter design

[0111]

[0112] Table 4 LCC unbalanced and balanced compensation circuit parameter design

[0113]

[0114] Through (1-20), we can analyze the noise suppression effect of SS, LCC, and LCL circuits using balanced impedance circuits on wireless energy communication systems, and test the effect of the balanced technology proposed in this article in LCC, LCL, and SS topologies. Spectral distribution of voltage drop across LISN resistor and observation Figure 7 (a) (b) It is found that the balancing technology applied to LCC and LCL topologies basically achieves CM noise suppression across the entire frequency band, which is consistent with the Figure 8 The balanced compensation circuit of LCC and LCL topology is shown in and The whole frequency band is approximately equal and consistent. Figure 7 As shown in (c), the balancing technology under the SS topology only achieves CM noise suppression below 1MHz and has no effect on CM noise above 1MHz, which is consistent with the Figure 8 The SS balance compensation circuit shown can only achieve and This is consistent with the situation where impedance matching is equal near low frequencies but cannot be achieved at high frequencies.

[0115] After completing the design of a set of main coil (transmitting coil Lp and receiving coil Ls) and auxiliary coil inductances based on balanced impedance, a suitable magnetic integrated circuit structure is designed based on the distributed and stacked magnetic circuit optimization strategy with the help of electromagnetic simulation software to realize the design of the magnetic circuit. For example, Table 5 shows the parameter results of a set of main coils (transmitting coil Lp and receiving coil Ls) and auxiliary coils under distributed and stacked designs. The results show that both design schemes meet the theoretical analysis.

[0116] Table 5 Parameter design of magnetic integration based on distributed and stacked structure

[0117]

[0118] It should be noted that the above content merely illustrates the technical idea of the present invention and cannot be used to limit the scope of protection of the present invention. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications all fall within the scope of protection of the claims of the present invention.

Claims

1. The noise suppression system of the wireless energy signal transmission system based on magnetic circuit impedance balance is composed of a primary and secondary side transmitting coil module, a magnetic circuit balance module and a coil compensation circuit, and is characterized by: The primary transmitting coil module and the primary magnetic circuit balance module include an absorbing material, on which an auxiliary ferrite substrate, an auxiliary coil Lp1, an auxiliary ferrite substrate, an auxiliary coil Lp2, a ferrite skeleton, a transmitting coil Lp, and a coil compensation circuit are sequentially stacked upward; The secondary transmitting coil module and the secondary magnetic circuit balancing module include an absorbing material, on which an auxiliary ferrite substrate, an auxiliary coil Ls1, an auxiliary ferrite substrate, an auxiliary coil Ls2, a ferrite skeleton, a receiving coil Ls, and a coil compensation circuit are sequentially stacked upward; The auxiliary ferrite substrate and the ferrite skeleton are distributedly stacked or layered, and the two auxiliary coils (Lp1, Ls1) and the auxiliary coils (Lp2, Ls2) are both placed inside the transmitting coil Lp and the receiving coil Ls; The coil compensation circuit transforms the original circuit structure by using the split capacitance and split inductance calculated by the balanced impedance theory, thereby forming a complete noise suppression system with balanced magnetic circuit impedance.

2. The noise suppression system of the wireless energy signal transmission system based on magnetic circuit impedance balance according to claim 1 is characterized in that: The compensation circuit includes SS, LCC, and LCL, and the parameters of the split capacitance and split inductance of the coil compensation circuit are calculated by balanced impedance theory.

3. The noise suppression system of the wireless energy signal transmission system based on magnetic circuit impedance balance according to claim 2, characterized in that: The split capacitor and split inductor structure is used to optimize the circuit components and adjust the magnetic circuit characteristic impedance of the wireless energy communication system in the conducted noise frequency band, thereby suppressing the electromagnetic noise caused by the magnetic circuit impedance mismatch and improving the communication quality.

4. The noise suppression system of the wireless energy signal transmission system based on magnetic circuit impedance balance according to claim 3 is characterized in that: The compensation circuit achieves balanced impedance by splitting the capacitor and splitting the inductor, wherein the split compensation inductor is divided into two types of decoupling schemes: distributed stacking and horizontal stacking.

5. The noise suppression system of the wireless energy signal transmission system based on magnetic circuit impedance balance according to claim 4 is characterized in that: The distributed stacking is to stack the auxiliary coils (Lp1, Ls1, Lp2, Ls2) horizontally along the central axis of the transmitting coil Lp and the receiving coil Ls, and adjust the coil sizes to achieve mutual inductance decoupling.

6. The noise suppression system of the wireless energy signal transmission system based on magnetic circuit impedance balance according to claim 4, characterized in that: The horizontal stacking is to stack the auxiliary coils (Lp1, Ls1, Lp2, Ls2) vertically along the central axis of the transmitting coil Lp and the receiving coil Ls, and adjust the coil sizes to achieve mutual inductance decoupling.

7. The noise suppression system of the wireless energy signal transmission system based on magnetic circuit impedance balance according to any one of claims 5 and 6, characterized in that: The transmitting coil Lp, receiving coil Ls, auxiliary coils (Lp1, Ls1, Lp2, Ls2) and auxiliary ferrite substrate are all vertical central axis symmetrical models.

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