A design method for magnetic coupling communication circuit

Abstract

The present invention discloses a magnetic coupling communication circuit design method, which belongs to the field of wireless charging. The method comprises the following steps: obtaining electromagnetic simulation parameters based on the diameter of an underwater vehicle and the axial distance between a charging cabin; calculating the compensation inductance and capacitance value of the primary side of the information and the capacitance value of the secondary side based on the electromagnetic simulation parameters to obtain compensation parameters; obtaining the optimal information transient response adjustment resistor based on the electromagnetic simulation parameters and the compensation parameters; obtaining the optimal signal-to-noise ratio and the optimal information transmission gain of the communication circuit based on the optimal information transient response adjustment resistor and circuit parameters. The present invention can reasonably adjust the value of the information receiving resistor so that the system has a higher signal-to-noise ratio and information transmission gain, and effectively reduces the information bit error rate.

Description

Technical Field

[0001] The present invention belongs to the technical field of wireless charging, and in particular relates to a magnetic coupling communication circuit design method. Background Art

[0002] Underwater vehicles are important tools for exploring marine resources and are usually used for underwater surveys, salvage or engineering operations. During the seabed exploration process, due to the internal space limitations of underwater equipment and the limited energy it carries, it is necessary to return to the underwater base station in time for power replenishment and transmit the detection information back. Traditional power replenishment uses cable wet plug-in technology, which has poor flexibility and low safety, and has problems such as joint leakage and wear; traditional underwater communication methods such as hydroacoustic communication, optical communication, and radio frequency communication have shortcomings such as low communication rate, susceptibility to hydrological conditions, and easy to be eavesdropped. The underwater wireless energy transmission technology uses the principle of electromagnetic induction to transfer power and information from one side to the other through a coil. It has low cost, no need for additional openings and installation, and a simple architecture, which can realize the simultaneous transmission of power and information for underwater vehicles. Existing underwater wireless energy transmission systems mostly use two sets of coils to transmit power and information respectively. Although the initial decoupling of the power channel and the information channel can be completed through the optimization design of the coupling mechanism, the strong electromagnetic interference caused by power transmission to information transmission cannot be ignored. In order to ensure that the system can achieve high-speed and low-error information transmission, it is necessary to optimize the design of the information circuit to improve the success rate of information demodulation. Therefore, the present invention provides a magnetic coupling communication circuit design method. Summary of the invention

[0003] In order to solve the above technical problems, the present invention proposes a magnetic coupling communication circuit design method to solve the above problems existing in the prior art.

[0004] To achieve the above object, the present invention provides a magnetic coupling communication circuit design method, comprising:

[0005] Electromagnetic simulation parameters are obtained based on the diameter of the underwater vehicle and the axial distance of the charging cabin;

[0006] Obtain compensation parameters based on the electromagnetic simulation parameter calculation information, the compensation inductance and capacitance value of the primary side and the capacitance value of the secondary side;

[0007] Obtaining an optimal information transient response adjustment resistor based on the electromagnetic simulation parameters and the compensation parameters;

[0008] The optimal signal-to-noise ratio and the optimal information transmission gain of the communication circuit are obtained by adjusting the resistance and the circuit parameters based on the optimal information transient response.

[0009] Optionally, the electromagnetic simulation parameters include: self-inductance of the information transmitting coil, self-inductance of the information receiving coil and mutual inductance between the information transmitting and receiving coils.

[0010] Optionally, based on the electromagnetic simulation parameters, the compensation inductance and capacitance values ​​of the primary side and the secondary side are calculated using the LCC-S compensation structure to obtain compensation parameters;

[0011] Among them, the compensation parameters include: information primary side series compensation inductance, information primary side parallel compensation capacitance, information primary side series compensation capacitance and secondary side series compensation capacitance.

[0012] Optionally, the process of obtaining the optimal information transient response adjustment resistance based on the electromagnetic simulation parameters and the compensation parameters includes:

[0013] Constructing a complex frequency domain equivalent circuit model of an information transmission loop based on the electromagnetic simulation parameters and the compensation parameters;

[0014] Solving the Laplace equation in the complex frequency domain equivalent circuit model of the information transmission loop to obtain the dominant pole of the information output voltage transfer function;

[0015] By changing the information transient response adjusting resistor to adjust the dominant pole of the information output voltage transfer function, the information transient response time under different information transient response adjusting resistors is calculated to obtain the optimal information transient response adjusting resistor.

[0016] Optionally, the expression for calculating the dominant pole of the information output voltage transfer function is: S=a+bj;

[0017] The expression for calculating the information transient response time under different information transient response adjustment resistances is: ;

[0018] Where S represents the dominant pole, t transient It represents the information transient response time in seconds, a represents the real part of the dominant pole, b represents the imaginary part coefficient of the dominant pole, and j represents the imaginary number sign.

[0019] Optionally, the process of obtaining an optimal signal-to-noise ratio and an optimal information transmission gain of a communication circuit includes:

[0020] By adjusting the value of the information receiving resistor, according to the equivalent circuit diagram of the information receiving end, the relationship between the system signal-to-noise ratio, the information transmission gain and the information receiving resistor is obtained, wherein the circuit parameters include the value of the information receiving resistor;

[0021] Based on the relationship between the system signal-to-noise ratio, information transmission gain and information receiving resistance, an optimal signal-to-noise ratio and an optimal information transmission gain are obtained.

[0022] Optionally, the expression for calculating the optimal signal-to-noise ratio is:

[0023] ;

[0024] In the formula, SNR represents the optimal signal-to-noise ratio, U N It represents the noise voltage from the interference of power transmission, in volts, U S Indicates the effective information voltage of the normal transmission of the information circuit, the unit is volt, P S It represents the noise power from the power transmission interference, in watts, P N It indicates the effective information power of normal transmission of information loop, measured in watts.

[0025] The present invention also provides a computer terminal device, comprising:

[0026] one or more processors;

[0027] A memory, coupled to the processor, for storing one or more programs;

[0028] When the one or more programs are executed by the one or more processors, the one or more processors implement a magnetic coupling communication circuit design method.

[0029] The present invention also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, a magnetic coupling communication circuit design method is implemented.

[0030] Compared with the prior art, the present invention has the following advantages and technical effects:

[0031] The magnetic coupling communication circuit design method provided by the present invention realizes the design of a communication circuit with high signal-to-noise ratio and fast transient response through accurate electromagnetic simulation parameter acquisition and compensation parameter calculation. The method first obtains key parameters through electromagnetic simulation according to the specific size requirements of the underwater vehicle, thereby ensuring the accuracy and adaptability of the design. Then, these parameters are used to calculate the compensation inductance and capacitance values ​​on the primary and secondary sides, and the dynamic performance of the circuit is optimized. Furthermore, by adjusting the information transient response adjustment resistor, the optimal value is found, thereby shortening the transient response time of information transmission and improving the response speed of the system. Finally, combined with the optimal adjustment resistor and other circuit parameters, a high signal-to-noise ratio and high information transmission gain of the communication circuit are achieved, effectively reducing the information bit error rate and improving the reliability and efficiency of underwater communication. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0033] Figure 1 The circuit structure of the wireless energy signal simultaneous transmission system for underwater vehicles according to an embodiment of the present invention;

[0034] Figure 2 is an equivalent circuit diagram of an information transmission circuit according to an embodiment of the present invention;

[0035] Figure 3 It is a complex frequency domain equivalent circuit diagram of an information transmission loop according to an embodiment of the present invention;

[0036] Figure 4 A diagram showing the relationship between transient response time and information transient response adjustment resistance according to an embodiment of the present invention;

[0037] Figure 5 is an equivalent circuit diagram of an information receiving end according to an embodiment of the present invention;

[0038] Figure 6 The relationship between the signal-to-noise ratio and information transmission gain and the information receiving resistance of the embodiment of the present invention;

[0039] Figure 7 The information transmission circuit design process of the wireless energy signal simultaneous transmission system according to the embodiment of the present invention;

[0040] Figure 8 This is a simulation diagram of information transmission in a simultaneous interpretation system according to an embodiment of the present invention;

[0041] Fig. 9 This is a diagram showing the FFT analysis results of the voltage across the information receiving resistor according to an embodiment of the present invention. DETAILED DESCRIPTION

[0042] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0043] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0044] Embodiment 1:

[0045] Based on the initial decoupling of the power channel and the information channel by optimizing the design of the coupling mechanism, the present invention further designs a magnetic coupling communication circuit to ensure a high success rate in information demodulation and a low bit error rate in information transmission, while shortening the transient response time, which helps to increase the information transmission rate.

[0046] This embodiment provides a magnetic coupling communication circuit design method, including the following steps:

[0047] (1) According to the requirements of the diameter of the underwater vehicle and the axial distance between the charging cabin, a three-dimensional model of the coupling mechanism is designed in Ansys Maxwell software and electromagnetic simulation is performed to obtain the self-inductance L1 of the information transmitting coil, the self-inductance L2 of the receiving coil and the mutual inductance M of the two coils. 12 The electromagnetic simulation parameters.

[0048] (2) Based on the LCC-S (Inductance-series Capacitance-parallel Capacitance-series and Series) compensation structure, the compensation parameters are calculated. The compensation parameters include: Information primary side series compensation inductor L f1 , parallel compensation capacitor C f1 , series compensation capacitor C1 and secondary side series compensation capacitor C2.

[0049] (3) Based on the electromagnetic simulation parameters and compensation parameters, the optimal information transient response adjustment resistor is obtained. Based on the complex frequency domain form of Kirchhoff's voltage and current laws, the Laplace equation of the information transmission loop is listed, the dominant pole of the information output voltage transfer function is obtained, and the information transient response adjustment resistor R is continuously changed. transient , using formula (8) to obtain the information transient response time, R transient The value corresponds to the point when the transient response time of the information is the shortest.

[0050] (4) Based on the optimal information transient response, the resistor and circuit parameters are adjusted to obtain the optimal signal-to-noise ratio and optimal information transmission gain of the communication circuit. According to the equivalent circuit diagram of the information receiving end, the system signal-to-noise ratio and information transmission gain G and the information receiving resistor R are obtained. d The relationship between d Take appropriate values ​​to ensure that the system has a high signal-to-noise ratio and information transmission gain. Substitute the above parameters into the circuit model and use Simulink software to perform circuit simulation to verify the effectiveness of the information transmission circuit design method.

[0051] Figure 1This is the circuit structure of the wireless energy and information transmission system for underwater vehicles, which consists of two parts: the power transmission circuit and the information transmission circuit. During the power transmission process, the primary-side DC power supply is first converted into AC power through the inverter, and then the reactive power is eliminated through the LCC (Inductance-series Capacitance-parallel Capacitance-series) compensation topology to improve the power transmission efficiency. At the same time, the rich high-frequency harmonic components in the inverter output are filtered out to reduce interference with information transmission, and then the power transmitting coil is stimulated to generate a steady electromagnetic field. After the power receiving coil on the secondary side induces an electromotive force, the reactive power is eliminated through the LCC compensation topology, and then the AC power is converted into DC power through the rectifier to provide power for the battery. Information transmission adopts the LCC-S compensation topology. Among them, L fp , C fp , C p are the series compensation inductor, parallel compensation capacitor and series compensation capacitor at the power transmitter end, L fs , C fs , C s are the series compensation inductor, parallel compensation capacitor and series compensation capacitor at the power receiving end, respectively. p is the self-inductance of the electric energy transmitting coil, L s is the self-inductance of the power receiving coil, M ps is the mutual inductance between the power transmitting and receiving coils, U in and U out are the input and output DC voltages respectively, R is the load resistance, S1, S2, S3, S4 are the inverter switches, D1, D2, D3, D4 are the rectifier switches, U p is the inverter output AC voltage, U s is the AC voltage at the rectifier input.

[0052] M p1 、M p2 、M s1 、M s2 They are the mutual inductances between the power transmission and information transmission coils, the power transmission and information reception coils, the power reception and information transmission coils, and the power reception and information reception coils. L1 is the self-inductance of the information transmission coil, L2 is the self-inductance of the information reception coil, and M 12 is the mutual inductance between the information transmitting and receiving coils, L f1 , C f1 C1 and C2 are the series compensation inductor, parallel compensation capacitor and series compensation capacitor of the information transmitting end, respectively; C2 is the series compensation capacitor of the information receiving end; R d is the information receiving resistor, U1 is the high-frequency carrier signal carrying information, R transient Adjust the resistance for information transient response.

[0053] In order to improve the system power transmission efficiency and information transmission rate, some of the above parameters satisfy the following formula:

[0054] (1)

[0055] (2)

[0056] (3)

[0057] In the above formula is the power transmission frequency, High frequency carrier frequency for information transmission.

[0058] Furthermore, the process of obtaining the optimal information transient response adjusting resistor based on the electromagnetic simulation parameters and the compensation parameters includes: constructing a complex frequency domain equivalent circuit model of the information transmission loop based on the electromagnetic simulation parameters and the compensation parameters; solving the Laplace equation in the complex frequency domain equivalent circuit model of the information transmission loop to obtain the dominant poles of the information output voltage transfer function; adjusting the dominant poles of the information output voltage transfer function by changing the information transient response adjusting resistor, calculating the information transient response time under different information transient response adjusting resistors to obtain the optimal information transient response adjusting resistor.

[0059] As a specific implementation of this embodiment, Figure 2 The equivalent circuit diagram of the information transmission loop is shown in Figure 1. The information transmitting coil self-inductance L1 is connected in series with the compensation capacitor C1, and the information transient response adjustment resistor R transient With compensation inductance L f1 Series connection, compensation capacitor C f1 With compensation inductance L f1 The information receiving coil self-inductance L2 and the information receiving resistor R d , and compensation capacitor C2 are connected in series. Z1, Z2, Z3 and Z4 are the equivalent input impedances of each port when viewed from left to right. The information transmission gain G can be calculated by formula (4):

[0060] (4)

[0061] in:

[0062] (5)

[0063] Figure 3 This is the equivalent circuit diagram of the information transmission loop in the complex frequency domain. The parameters in the figure satisfy the following formula:

[0064] (6)

[0065] We can get:

[0066] (7)

[0067] Solve the dominant pole of the high-order system transfer function shown in equation (7). The dominant pole S can be expressed as S = a + bj, where a represents the real part of the dominant pole, b represents the imaginary part coefficient of the dominant pole, and j represents the imaginary number sign.

[0068] Then the transient response time t transient Its value can be given by the following formula:

[0069] (8)

[0070] Figure 4 It is the relationship diagram between transient response time and information transient response adjustment resistance. It can be seen that when the information transient response adjustment resistance R transient When R increases, the transient response time decreases first and then increases. transient , which can improve the transient response of the information transmission channel, shorten the waveform rise time and fall time, and increase the success rate of information demodulation without affecting the steady-state transmission gain of the information.

[0071] Figure 5 Is the equivalent circuit diagram of the information receiving end in the present invention. p M p2 I p (jω p M p2 I s ) represents the interference voltage of the electric energy transmitting and receiving coils coupled to the information receiving coil, jω1M 12 I1 represents the effective information coupled from the information transmitting coil to the information receiving coil, U d is the information receiving resistor R d The voltage across the two ends is composed of the noise voltage U from the power transmission interference N And information voltage U S Superposition formation.

[0072] The signal-to-noise ratio of the wireless energy signal transmission system in the present invention is defined as:

[0073] (9)

[0074] In the formula, SNR represents the optimal signal-to-noise ratio, U N Represents the noise voltage from power transmission interference, U S Indicates the effective information voltage of the normal transmission of the information circuit, P S Represents the noise power from power transmission interference, P N Indicates the effective information power of normal transmission of the information loop.

[0075] Among them, each parameter satisfies:

[0076] (10)

[0077] Figure 6 The relationship between the signal-to-noise ratio and information transmission gain of the wireless energy signal transmission system in the present invention and the information receiving resistance. It can be seen that as the information receiving resistance increases, the information transmission gain increases slowly and the system signal-to-noise ratio drops sharply. This is because although the LCC-S topology can achieve constant voltage output, this system additionally introduces the information transient adjustment resistor R transient , affecting the original constant voltage output characteristics; at the same time R d The reduction of reduces the interference voltage at both ends, so the signal-to-noise ratio drops sharply.

[0078] Figure 7 The design process of the information transmission circuit of the wireless energy signal transmission system in the present invention is as follows. First, the three-dimensional model of the coupling mechanism is designed in Ansys Maxwell software and electromagnetic simulation is performed to obtain the self-inductance L1 of the information transmitting coil, the self-inductance L2 of the receiving coil and the mutual inductance M of the two coils. 12 Secondly, based on the LCC-S compensation structure, the information primary side series compensation inductor L is calculated. f1 , parallel compensation capacitor C f1 , series compensation capacitor C1 and secondary side series compensation capacitor C2. Then, the Laplace equation of the information transmission loop is listed to find the dominant pole of the information output voltage transfer function, and the information transient response adjustment resistor R is continuously changed. transient , using formula (8) to obtain the information transient response time, R transient The value corresponds to the point when the transient response time of the information is the shortest.

[0079] Finally, according to the equivalent circuit diagram of the information receiving end, the system signal-to-noise ratio, information transmission gain G and information receiving resistance R are obtained. d The relationship between d Take appropriate values ​​to ensure that the system has a high signal-to-noise ratio and information transmission gain. Substitute the above parameters into the circuit model and use Simulink software to perform circuit simulation to verify the effectiveness of the information transmission circuit design method.

[0080] Figure 8 This is the simulation result of information transmission in the wireless energy communication system. The rising and falling times of the waveform of the effective information to be demodulated after transmission are short, and the transient response time is about 3.5μs, which is consistent with the theoretical analysis. The noise voltage is very small and has almost no effect on the information demodulation effect.

[0081] Fig. 9This is the FFT (Fast Fourier Transform) analysis result of the voltage across the information receiving resistor. The proportion of the high-frequency carrier frequency component is much larger than the power transmission working frequency component, which verifies the effectiveness of the high signal-to-noise ratio information transmission circuit design method proposed in the present invention.

[0082] The present invention proposes a magnetic coupling communication circuit design method, which can not only quickly adjust the information transient response time, reduce the rise and fall time of the information waveform, and improve the success rate of information demodulation. At the same time, the information transmission loop adopts an LCC-S compensation structure, and the system can have a higher signal-to-noise ratio and information transmission gain by reasonably adjusting the value of the information receiving resistance, effectively reducing the information bit error rate, and the effectiveness of the information transmission circuit design method is verified by simulation tests.

[0083] The information transmission circuit design method mentioned in the present invention adds a transient response adjustment resistor to the information loop, obtains the transfer function and obtains the dominant pole through the complex frequency domain analysis method, can quickly realize the information transient response time adjustment, and improve the success rate of information demodulation. Compared with the existing wireless energy signal transmission system, the information transmission circuit mostly adopts the SS topology structure, and its information transmission gain and interference voltage are both related to the information receiving resistor R d When there are multiple transmission indicators in the system, it is very unfavorable for parameter design. The information transmission circuit of the present invention adopts the LCC-S compensation structure, and the information voltage is less affected by the information receiving resistance, while the interference voltage is positively correlated with the information receiving resistance. Therefore, by reasonably adjusting the value of the information receiving resistance, the system can have a higher signal-to-noise ratio and information transmission gain, and effectively reduce the information bit error rate.

[0084] Embodiment 2:

[0085] This embodiment also provides a computer terminal device, including:

[0086] one or more processors;

[0087] A memory, coupled to the processor, for storing one or more programs;

[0088] When one or more programs are executed by one or more processors, the one or more processors implement a magnetic coupling communication circuit design method.

[0089] This embodiment also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, a method for designing a magnetic coupling communication circuit is implemented.

[0090] The above are only preferred specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A magnetic coupling communication circuit design method, characterized in that: The following steps are involved: Electromagnetic simulation parameters are obtained based on the diameter of the underwater vehicle and the axial distance of the charging cabin; The electromagnetic simulation parameters include: the self-inductance of the information transmitting coil, the self-inductance of the information receiving coil and the mutual inductance between the information transmitting and receiving coils; Based on the electromagnetic simulation parameters, the compensation inductance and capacitance value of the information primary side and the capacitance value of the secondary side are calculated by using the LCC-S compensation structure to obtain compensation parameters; wherein the compensation parameters include: the information primary side series compensation inductance, the information primary side parallel compensation capacitance, the information primary side series compensation capacitance and the secondary side series compensation capacitance; Obtaining an optimal information transient response adjustment resistor based on the electromagnetic simulation parameters and the compensation parameters; The process of obtaining the optimal information transient response regulating resistor includes: constructing a complex frequency domain equivalent circuit model of the information transmission loop based on the electromagnetic simulation parameters and the compensation parameters; solving the Laplace equation in the complex frequency domain equivalent circuit model of the information transmission loop to obtain the dominant poles of the information output voltage transfer function; adjusting the dominant poles of the information output voltage transfer function by changing the information transient response regulating resistor to calculate the information transient response time under different information transient response regulating resistors to obtain the optimal information transient response regulating resistor; The optimal signal-to-noise ratio and the optimal information transmission gain of the communication circuit are obtained by adjusting the resistance and the circuit parameters based on the optimal information transient response.

2. The magnetic coupling communication circuit design method according to claim 1, characterized in that: The expression for calculating the dominant pole of the information output voltage transfer function is: S = a + b j; The expression for calculating the information transient response time under different information transient response adjustment resistances is: ； In the formula, S represents the dominant pole, t transient Indicates the transient response time of information, in seconds. a represents the real part of the dominant pole, b represents the imaginary coefficient of the dominant pole, and j represents the imaginary number sign.

3. The magnetic coupling communication circuit design method according to claim 1, characterized in that: The process of obtaining the optimal signal-to-noise ratio and the optimal information transmission gain of the communication circuit includes: By adjusting the value of the information receiving resistor, according to the equivalent circuit diagram of the information receiving end, the relationship between the system signal-to-noise ratio, the information transmission gain and the information receiving resistor is obtained, wherein the circuit parameters include the value of the information receiving resistor; Based on the relationship between the system signal-to-noise ratio, information transmission gain and information receiving resistance, an optimal signal-to-noise ratio and an optimal information transmission gain are obtained.

4. The magnetic coupling communication circuit design method according to claim 3, characterized in that: The expression for calculating the optimal signal-to-noise ratio is: ； In the formula, SNR represents the optimal signal-to-noise ratio, U N Represents the noise voltage from power transmission interference, in volts, U S Indicates the effective information voltage of the normal transmission of the information circuit, the unit is volt, P S It represents the noise power from the interference of power transmission, in watts, P N It indicates the effective information power of normal transmission of information loop, measured in watts.

5. A computer terminal device, characterized in that: include: one or more processors; A memory, coupled to the processor, for storing one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the magnetic coupling communication circuit design method as claimed in claim 1.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the magnetic coupling communication circuit design method as claimed in claim 1 is implemented.

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