CN117220723A - Device and method for solving magnetic resonance communication detuning problem of wearable equipment - Google Patents
Device and method for solving magnetic resonance communication detuning problem of wearable equipment Download PDFInfo
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- CN117220723A CN117220723A CN202311317075.8A CN202311317075A CN117220723A CN 117220723 A CN117220723 A CN 117220723A CN 202311317075 A CN202311317075 A CN 202311317075A CN 117220723 A CN117220723 A CN 117220723A
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Abstract
The invention relates to a device and a method for solving the problem of magnetic resonance communication detuning of wearable equipment. The method that the working frequency changes along with the resonance frequency of the coil is adopted, so that the problem of coil detuning is solved. The design does not need to design an impedance matching module, does not need to obtain matching network parameters through iteration, has the advantages of simple implementation mode, miniaturization and low power consumption, and is more suitable for solving the detuning problem of magnetic resonance communication of wearable equipment.
Description
Technical Field
The invention relates to a device and a method for solving the problem of magnetic resonance communication detuning of wearable equipment.
Background
The magnetic resonance communication of the wearable equipment is a novel communication mode of interaction among the wearable equipment, and the mode needs a coil for exciting a magnetic field in the equipment to work at a resonant frequency so as to exert the advantage of low path loss. However, the resonance frequency of the coil is changed due to the influence of the capacitance effect between the coil and the wearer, and the change is also influenced by the physiological parameter difference of the wearer, the change of the movement state and the like. This phenomenon may result in the coil not operating in a resonant state, resulting in a large increase in path loss between wearable devices. The current solution to the problem of coil detuning is generally to add an automatic impedance matching module to the coil. The design mode of the automatic impedance matching module is realized by taking a stepping motor, an adjustable capacitor and an adjustable inductor as cores; the other is realized by taking a capacitor inductance array and a large number of relays as cores. Both methods can cause the overall size of the module to be too large and the power consumption to be too high, and are not suitable for the field of wearable equipment focusing on light weight and low power consumption. In addition, the two methods need to obtain the capacitance value and the inductance value of the impedance matching network through iterative computation, the iterative computation time is long, and the method is not suitable for being applied to magnetic resonance wearable equipment with resonance points easy to change.
Disclosure of Invention
Aiming at the defects of the prior scheme, the invention provides a device and a method for solving the problem of magnetic resonance communication detuning of wearable equipment, and the method for changing the working frequency along with the change of the resonance frequency of a coil is adopted to solve the problem of detuning of the coil. Compared with the existing solution, the design does not need to design an impedance matching module or obtain matching network parameters through iteration, has the advantages of simple implementation mode, miniaturization and low power consumption, and is more suitable for solving the detuning problem of magnetic resonance communication of wearable equipment.
In order to achieve the above purpose, the technical scheme of the invention is as follows: the device for solving the magnetic resonance communication detuning problem of the wearable equipment comprises a direct digital frequency synthesizer module, a directional coupler module, an amplitude discrimination circuit module, an ADC module, a microcontroller module and a switch, wherein a first output end of the microcontroller module is connected with a signal input end of the switch through the direct digital frequency synthesizer module, a second output end of the microcontroller module is directly connected with a signal control end of the switch, a first output end of the switch is connected with a first end and a coil of the directional coupler module, a second output end of the switch is connected with a second end of the directional coupler module, and a third end and a fourth end of the directional coupler module are connected with two input ends of the amplitude discrimination circuit module; wherein,
the direct digital frequency synthesizer module is used for generating a signal with a designated frequency;
the directional coupler module is used for separating an incident signal and a reflected signal of the coil;
the amplitude discrimination circuit module is used for calculating a reflection coefficient by carrying out ratio operation on the separated incident signal and the reflection signal, and outputting a voltage value corresponding to the reflection coefficient, wherein the larger the reflection coefficient is, the larger the output voltage value is;
the ADC module is used for collecting the output voltage value of the amplitude discrimination circuit module;
the microcontroller module controls each module to work and processes the data sampled by the ADC module to obtain a frequency value corresponding to the minimum reflection coefficient.
In an embodiment of the present invention, the design of the amplitude discrimination circuit module refers to an AD8302 module.
In an embodiment of the present invention, the implementation manner of the device is: when the device tracks the resonant frequency, the signal input end of the switch is directly connected with the second output end of the switch, the microcontroller controls the direct digital frequency synthesizer module to sweep the frequency and transmit the sweep-frequency transmission signal to the coil through the directional coupler module, meanwhile, the directional coupler module separates the incident signal and the reflected signal of the coil, the amplitude discrimination circuit module outputs the reflection coefficient of the coil under each frequency signal according to the incident signal and the reflected signal, the microcontroller module obtains the magnitude of the reflection coefficient under each frequency signal by using the ADC module, the frequency corresponding to the coil with the minimum reflection coefficient is the resonant frequency according to the principle of a time domain reflection method, and then the microcontroller module enables the frequency corresponding to the minimum reflection coefficient to be the working frequency, so that the coil is in a resonant working state; and then the signal input end of the switch is directly connected with the first output end of the switch, the device performs normal communication work, when the resonance frequency of the coil changes, the new resonance frequency is acquired again, the working frequency changes along with the change of the resonance frequency of the coil, and the coil can be kept in a resonance state all the time.
The invention also provides a method for solving the problem of magnetic resonance communication detuning of the wearable equipment, which adopts the device and performs the following operations on the device:
after the device is started, the device enters a resonant frequency tracking state, the microcontroller module controls the signal input end of the switch to be directly connected with the second output end of the switch through the signal control end of the switch, and the microcontroller module generates a frequency-sweeping signal according to the preset upper and lower limits (f 1 ~f n ) The frequency sweep step length microcontroller module controls the direct digital frequency synthesizer module to generate signals in a frequency sweep mode according to a preset time interval and output the signals to the signal input end of the switch, and the signals of each frequency flow out from the first end of the directional coupler module through the second end of the directional coupler module and flow into the coil; at this time, the directional coupler module separates an incident signal and a reflected signal of the coil under the current frequency signal, and outputs the incident signal and the reflected signal to the amplitude discrimination circuit module from the third end and the fourth end of the directional coupler module, and the amplitude discrimination circuit obtains the coil reflection coefficient according to the incident signal and the reflected signal which flow in and outputs a voltage value corresponding to the reflection coefficient; the microcontroller module collects the voltage value output by the amplitude discrimination circuit module by using the ADC module, and the frequency corresponding to the minimum position of the voltage value is the resonance frequency of the coil; then, the microcontroller module controls the signal input end of the switch to be directly connected with the first output end of the switch through the signal control end of the switch to perform normal communication, and the frequency of the working signal generated by the direct digital frequency synthesizer module is the resonant frequency of the tracking coil, so that the primary resonant frequency tracking is completed; in a normal communication state, the device enters a monitoring state with T as a period, and in the monitoring state, the microcontroller module controls the signal input end of the switch to be directly connected with the second output end of the switch through the signal control end of the switch, so that the reflection coefficient of the coil at the current working frequency is obtained, and is compared with a preset threshold value in the device, and whether the coil is detuned at the working frequency is judged; if it is not tuned, it will start the tuning againAnd if the vibration frequency is not in resonance, the signal input end of the switch is controlled to be directly connected with the first output end of the switch through the signal control end of the switch, and normal communication is continued.
Compared with the prior art, the invention has the following beneficial effects:
the existing solution to the detuning problem generally adopts an automatic impedance matching method, and the automatic impedance matching scheme needs to design a matching module, but the module is too complex and difficult to realize, the iteration time required by matching is relatively long, and the method is not suitable for magnetic resonance communication wearable equipment which pays attention to light weight, low power consumption and easy change of resonance points. The device only needs to change the signal frequency, and does not need to carry out key design on the matching module, so that the whole scale of the device can be reduced, the power consumption can be reduced, and the time for tracking the resonant frequency can be shortened. The microcontroller module, the ADC module and the direct digital frequency synthesizer module are generally arranged in the wearable device, so that the device can be implanted in the wearable device under the optimal condition by only additionally adding the directional coupler module, the amplitude discrimination circuit module and the switching circuit module in the wearable device. In conclusion, the design is very suitable for solving the detuning problem of magnetic resonance communication of the wearable equipment, realizes automatic tracking of resonance frequency, ensures that a communication system always works in an optimal state, effectively reduces path loss, improves communication efficiency, and provides a safe, reliable and effective communication scheme for a structural body domain sensor network of the wearable equipment in key fields such as medical health, military training and the like.
Drawings
Fig. 1 is a time domain reflectometry.
Fig. 2 is a system block diagram of the device of the present invention.
Fig. 3 is a functional flow chart of the device of the present invention.
Detailed Description
The technical scheme of the invention is specifically described below with reference to the accompanying drawings.
As shown in fig. 2, the present invention provides a device for solving the problem of magnetic resonance communication mismatch of a wearable device, wherein a direct digital frequency synthesizer module is used for generating a signal with a specified frequency; the directional coupler module is used for separating an incident signal and a reflected signal of the coil; the amplitude discrimination circuit module is used for calculating a reflection coefficient by carrying out ratio operation on the separated incident signal and the reflection signal, outputting a voltage value corresponding to the reflection coefficient, wherein the larger the reflection coefficient is, the larger the output voltage value is, and the design of the amplitude discrimination circuit module can refer to the AD8302 module; the ADC module is used for collecting the output voltage value of the amplitude discrimination circuit module; the microcontroller module is used as a microprocessor to control the work of each module and process the data sampled by the ADC to obtain a frequency value corresponding to the minimum reflection coefficient.
When the device tracks the resonant frequency, the switch 9 is turned on and the switch 8 is turned off, the microcontroller controls the sending signal of the direct digital frequency synthesizer sweep frequency to be transmitted to the coil through the directional coupler, meanwhile, the directional coupler separates the incident and reflected signals of the coil, the amplitude discrimination module outputs the reflection coefficient of the coil under each frequency signal according to the incident and reflected signals, and the microcontroller obtains the reflection coefficient under each frequency signal by using the ADC. According to the principle of the time domain reflectometry shown in fig. 1, the frequency corresponding to the minimum coil reflection coefficient is the resonant frequency. And then the microcontroller takes the frequency corresponding to the minimum reflection coefficient as the working frequency, so that the coil is in a resonant working state. The switches 8 are then turned on and 9 are turned off and the device performs normal communication operation. When the resonance frequency of the coil changes, the new resonance frequency is acquired again through the mode, so that the working frequency changes along with the change of the resonance frequency of the coil, and the coil can be kept in a resonance state all the time.
The invention also provides a method for solving the problem of magnetic resonance communication detuning of the wearable equipment, which adopts the device, and the following operations are executed on the device, and the functional flow chart of the device is shown in figure 3:
after the device is started, the device enters a resonant frequency tracking state, and the microcontroller controls the switch 9 to be conducted through the switches 2 and 7 (the switch 6 is a signal input end, the switch 6 is directly connected with the switch 9 when the switch 9 is conducted, and the switch 6 is directly connected with the switch 8 when the switch 8 is conducted), and the device is controlled to be in a resonant frequency tracking state according to the preset upper and lower sweep limits (f 1 ~f n ) And the sweep frequency step length is controlled by 1 and 4 to generate signals by a direct digital frequency synthesizer according to a certain time interval and output the signals by 5. Each frequency ofThe signal will flow through 10 into the directional coupler and out 11 and into the coil 14. The directional coupler separates the incident signal and the reflected signal of the coil at the current frequency signal and outputs the incident signal and the reflected signal from 12, 13 to the amplitude discrimination circuit module. The amplitude discrimination circuit finds the coil reflection coefficient from the incident signals and the reflected signals flowing in 15, 16, and outputs a voltage value corresponding to the reflection coefficient from 17. The microcontroller collects the voltage value output by the amplitude discrimination circuit module 17 through 3 by using the ADC module, and the frequency corresponding to the minimum voltage value is the resonance frequency of the coil. Then, the microcontroller switches on the switch 8 to conduct normal communication, and the frequency of the working signal generated by the direct digital frequency synthesizer is the tracked resonant frequency, so that the tracking of the resonant frequency is completed. In the normal communication state, the device enters the monitoring state with the period of T. The microcontroller switches on the switch 9 in the monitoring state, acquires the reflection coefficient of the coil at the current working frequency, and compares the reflection coefficient with a preset threshold value in the interior so as to judge whether the coil is detuned at the working frequency. If the resonance frequency is not tuned, the resonance frequency tracking is started again, and if the resonance frequency is not tuned, the switch is switched back to 8 to conduct, and normal communication is continued.
The device of the invention is used in the following modes: before using the function of the device, the upper and lower limits of the sweep frequency, the frequency step length and the monitoring period T are set. The smaller the step size, the closer the resulting resonant frequency is to the truly shifted resonant frequency, but too small a step size also increases the resonant frequency tracking time. The monitoring period is the time interval during which the device monitors whether the coil is detuned, once per period. After the parameters are set, the function of the device can be used, and the device can automatically judge whether the frequency of the signal needs to be adjusted according to the internal voltage threshold value, so that the problem of detuning of the coil is solved.
The above is a preferred embodiment of the present invention, and all changes made according to the technical solution of the present invention belong to the protection scope of the present invention when the generated functional effects do not exceed the scope of the technical solution of the present invention.
Claims (4)
1. The device for solving the magnetic resonance communication detuning problem of the wearable equipment is characterized by comprising a direct digital frequency synthesizer module, a directional coupler module, an amplitude discrimination circuit module, an ADC module, a microcontroller module and a switch, wherein a first output end of the microcontroller module is connected with a signal input end of the switch through the direct digital frequency synthesizer module, a second output end of the microcontroller module is directly connected with a signal control end of the switch, a first output end of the switch is connected with a first end and a coil of the directional coupler module, a second output end of the switch is connected with a second end of the directional coupler module, and a third end and a fourth end of the directional coupler module are connected with two input ends of the amplitude discrimination circuit module; wherein,
the direct digital frequency synthesizer module is used for generating a signal with a designated frequency;
the directional coupler module is used for separating an incident signal and a reflected signal of the coil;
the amplitude discrimination circuit module is used for calculating a reflection coefficient by carrying out ratio operation on the separated incident signal and the reflection signal, and outputting a voltage value corresponding to the reflection coefficient, wherein the larger the reflection coefficient is, the larger the output voltage value is;
the ADC module is used for collecting the output voltage value of the amplitude discrimination circuit module;
the microcontroller module controls each module to work and processes the data sampled by the ADC module to obtain a frequency value corresponding to the minimum reflection coefficient.
2. The apparatus for solving the problem of magnetic resonance communication mismatch of a wearable device according to claim 1, wherein the design of the amplitude discrimination circuit module refers to an AD8302 module.
3. The device for solving the problem of magnetic resonance communication mismatch of a wearable device according to claim 1, wherein the implementation manner of the device is as follows: when the device tracks the resonant frequency, the signal input end of the switch is directly connected with the second output end of the switch, the microcontroller controls the direct digital frequency synthesizer module to sweep the frequency and transmit the sweep-frequency transmission signal to the coil through the directional coupler module, meanwhile, the directional coupler module separates the incident signal and the reflected signal of the coil, the amplitude discrimination circuit module outputs the reflection coefficient of the coil under each frequency signal according to the incident signal and the reflected signal, the microcontroller module obtains the magnitude of the reflection coefficient under each frequency signal by using the ADC module, the frequency corresponding to the coil with the minimum reflection coefficient is the resonant frequency according to the principle of a time domain reflection method, and then the microcontroller module enables the frequency corresponding to the minimum reflection coefficient to be the working frequency, so that the coil is in a resonant working state; and then the signal input end of the switch is directly connected with the first output end of the switch, the device performs normal communication work, when the resonance frequency of the coil changes, the new resonance frequency is acquired again, the working frequency changes along with the change of the resonance frequency of the coil, and the coil can be kept in a resonance state all the time.
4. A method for solving the problem of magnetic resonance communication detuning of a wearable device, characterized in that the following operations are performed on the device by adopting the device as claimed in claims 1-3:
after the device is started, the device enters a resonant frequency tracking state, the microcontroller module controls the signal input end of the switch to be directly connected with the second output end of the switch through the signal control end of the switch, and the microcontroller module generates a frequency-sweeping signal according to the preset upper and lower limits (f 1 ~f n ) The frequency sweep step length microcontroller module controls the direct digital frequency synthesizer module to generate signals in a frequency sweep mode according to a preset time interval and output the signals to the signal input end of the switch, and the signals of each frequency flow out from the first end of the directional coupler module through the second end of the directional coupler module and flow into the coil; at this time, the directional coupler module separates an incident signal and a reflected signal of the coil under the current frequency signal, and outputs the incident signal and the reflected signal to the amplitude discrimination circuit module from the third end and the fourth end of the directional coupler module, and the amplitude discrimination circuit obtains the coil reflection coefficient according to the incident signal and the reflected signal which flow in and outputs a voltage value corresponding to the reflection coefficient; the microcontroller module collects the voltage value output by the amplitude discrimination circuit module by using the ADC module, and the frequency corresponding to the minimum position of the voltage value is the resonance frequency of the coil; along with itThe microcontroller module is directly connected with the first output end of the switch through the signal input end of the switch controlled by the signal control end of the switch to perform normal communication, and the frequency of the working signal generated by the direct digital frequency synthesizer module is the resonant frequency of the tracking coil, so that the primary resonant frequency tracking is completed; in a normal communication state, the device enters a monitoring state with T as a period, and in the monitoring state, the microcontroller module controls the signal input end of the switch to be directly connected with the second output end of the switch through the signal control end of the switch, so that the reflection coefficient of the coil at the current working frequency is obtained, and is compared with a preset threshold value in the device, and whether the coil is detuned at the working frequency is judged; if the resonance frequency tracking is not tuned, the signal input end of the switch is controlled to be directly connected with the first output end of the switch through the signal control end of the switch, and normal communication is continued.
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| CN202311317075.8A CN117220723A (en) | 2023-10-12 | 2023-10-12 | Device and method for solving magnetic resonance communication detuning problem of wearable equipment |
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| CN202311317075.8A CN117220723A (en) | 2023-10-12 | 2023-10-12 | Device and method for solving magnetic resonance communication detuning problem of wearable equipment |
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