CN115591124A - Output power self-adaptive control system for magnetic stimulation and control method thereof - Google Patents
Output power self-adaptive control system for magnetic stimulation and control method thereof Download PDFInfo
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- CN115591124A CN115591124A CN202211335373.5A CN202211335373A CN115591124A CN 115591124 A CN115591124 A CN 115591124A CN 202211335373 A CN202211335373 A CN 202211335373A CN 115591124 A CN115591124 A CN 115591124A
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- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N2/00—Magnetotherapy
- A61N2/02—Magnetotherapy using magnetic fields produced by coils, including single turn loops or electromagnets
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N2/00—Magnetotherapy
- A61N2/004—Magnetotherapy specially adapted for a specific therapy
- A61N2/006—Magnetotherapy specially adapted for a specific therapy for magnetic stimulation of nerve tissue
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
- H05K7/20136—Forced ventilation, e.g. by fans
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
- H05K7/20209—Thermal management, e.g. fan control
Abstract
The invention relates to an output power self-adaptive control system for magnetic stimulation and a control method thereof, which mainly solve the problem that when the magnetic stimulation is output, the strength can be infinitely adjusted to cause that the coil is overheated, the output of a magnetic field has to be stopped to wait for cooling, thereby influencing the clinical use. The existing scheme mostly limits the maximum strength which can be achieved under a certain frequency or a certain parameter scheme by cutting, and the scheme adaptively calculates the maximum strength which can be output under the parameters according to the frequency, the output time, the interval time and the type of the stimulating coil, so that the magnetic stimulation equipment can normally and continuously output without the phenomenon of insufficient strength or frequent over-temperature, and the experience of clinical application is ensured.
Description
Technical Field
The invention relates to the technical field of magnetic stimulation, in particular to an output power self-adaptive control system for magnetic stimulation and a control method thereof.
Background
The application of the magnetic stimulation technology is mature, along with the constant innovation of the technology, not only mental rehabilitation, nervous rehabilitation and now increasingly approved postpartum rehabilitation, but also the maximum magnetic field intensity which can be achieved by the application of the magnetic stimulation is higher and higher, the frequency of the magnetic stimulation pulse output by the magnetic stimulation equipment is also increased, and therefore the balance between the output of high intensity and high frequency becomes a problem to be considered.
The magnetic stimulation output circuit mainly comprises a main control board, a silicon controlled rectifier, a boosting power supply, an energy storage pulse capacitor, a resistance-capacitance absorption board, a coil and the like. The main control board controls the boosting power supply to start boosting, the charging circuit in the boosting power supply charges the energy storage pulse capacitor, the main control board turns on the silicon controlled rectifier after charging is completed, the pulse capacitor discharges through the coil, and a space magnetic field is generated when current passes through the coil.
When the output magnetism is amazing, there is heavy current pulse to flow through the coil, makes the temperature rise in the coil, but the cooling capacity of the cooling system of coil is limited, and when the repeated amazing of high frequency and high strength, the temperature can rise fast, if surpass safe temperature equipment and will stop exporting, just can resume work after waiting the temperature to descend, not only influences the use and also can accelerate the coil ageing.
The current magnetic stimulators either do not take this problem into account, or else use a magnetic stimulation that is limited to a certain intensity at a certain fixed stimulation parameter or above a certain stimulation frequency, with the disadvantage of not taking into account the difference between the effective output power and the coil. For example, when the stimulation is performed at a high frequency, the stimulation time is short, the stimulation interval is long, the output duty ratio is small, and in this case, the heat dissipation is not actually problematic, but the intensity is limited, and the expected effect may not be achieved; different magnetic stimulation coils have different functional applications, different structures, different Q values and different heat dissipation effects, so that the difference between the different coils is not considered due to simple and general limitations, the limitation is not high, and the highest value of the equipment cannot be exerted.
Disclosure of Invention
The invention aims to provide an output power self-adaptive control system for magnetic stimulation and a control method thereof, wherein when the relationship between the stimulation interval time and the intensity of the output frequency of the magnetic stimulation and the stimulation output time is balanced, the heat dissipation system of the magnetic stimulation equipment can meet the continuous and stable work of the equipment so as to meet the normal use of the equipment by people, and simultaneously can also play the highest level of the equipment so as to solve the problems in the background technology.
In order to achieve the purpose, the technical scheme of the invention is as follows:
an output power self-adaptive control system for magnetic stimulation comprises an upper computer subsystem, a lower computer subsystem and a heat dissipation system, wherein the upper computer subsystem is connected with the lower computer subsystem, and the heat dissipation system is respectively connected with the upper computer subsystem and the lower computer subsystem;
the upper computer subsystem comprises a core board and a man-machine interaction module connected with the core board, and is used for editing parameters of magnetic stimulation output, controlling the start and the end of magnetic stimulation, adjusting the intensity of the stimulation output during the magnetic stimulation output and displaying magnetic stimulation information;
the lower computer subsystem comprises a main control module, a power supply filter and at least one path of magnetic stimulation coil, wherein each path of magnetic stimulation coil is respectively connected with the main control module and the power supply filter, and the lower computer subsystem is used for generating a pulse magnetic field;
the cooling system comprises a cooling control module and a cooling device, the input end of the cooling control module is connected with the core board, the output end of the cooling control module is connected with the cooling device, and the cooling system is used for cooling the stimulation coil and the host.
In the above scheme, the master control module in the lower computer subsystem receives the stimulation output parameters issued by the upper computer subsystem and sequentially outputs the pulsed magnetic field; the upper computer subsystem adjusts the intensity of the stimulation output and sends the intensity to the lower computer subsystem, and the lower computer subsystem adjusts the charging voltage according to the intensity.
As a preferred scheme, each of the magnetic stimulation coils includes at least one path of boosting power supply and one path of coil, an output end of each of the boosting power supplies is connected to one path of pulse capacitor, and the pulse capacitor is connected to the coil.
As a preferred scheme, each of the magnetic stimulation coils includes one path of boosting power supply and at least one path of coil, an output end of the boosting power supply is connected to one path of pulse capacitor, and the pulse capacitor is connected to the at least one path of coil.
In the above scheme, the heat dissipation device comprises a pump, a water tank and a fan, wherein the output end of the heat dissipation control module is respectively connected with the pump, the water tank and the fan, and the pump is connected with the water tank through a flow sensor; the heat dissipation control module is connected with the water tank through a liquid level sensor; the water tank is connected with the lower computer subsystem through the separator, and the fan is connected with the heat dissipation control module through the rotating speed feedback module.
A control method of an output power adaptive control system for magnetic stimulation, comprising the steps of:
s1: selecting the type of the magnetic stimulation coil, and acquiring related parameters of the current magnetic stimulation coil;
s2: editing stimulation output parameters and issuing the stimulation output parameters;
s3: starting stimulation output, judging whether the stimulation intensity changes or not, and calculating the current output intensity W if the stimulation intensity changes;
s4: and judging whether the intensity adjusted by the system is greater than the current intensity W or not, if so, prompting that the adjustment is not allowed, otherwise, issuing the intensity, and repeating the step S3.
In the above scheme, after the actual system parameters are obtained, the maximum output power P of the system is kept unchanged, and the maximum output intensity W of the system at that time is calculated when other system parameters are changed.
Further, the maximum output power P of the system is the joule power of the whole stimulation coil:
wherein N is the number of circles in the coil, the big circle N is 1, the splayed N is 2, rho is the conductivity of the winding wire, b is the thickness of the coil, and R is out Is the outer diameter of the coil, R in Is the coil inner diameter, and T is the total time of one stimulation cycleD is duty cycle, T P Duration of a single stimulation pulse, T G Is the interval time of two adjacent pulses, U m Is the highest voltage of the system, R S W is the output intensity for the total equivalent resistance of the system.
Compared with the prior art, the invention has the beneficial effects that: the maximum strength capable of being output under the parameters is calculated adaptively according to the frequency, the output time, the interval time and the type of the stimulating coil of the magnetic stimulation, so that the magnetic stimulation equipment can output normally and continuously without the phenomenon of insufficient strength or frequent over-temperature, and the experience of clinical application is ensured.
Drawings
The disclosure of the present invention is illustrated with reference to the accompanying drawings. It is to be understood that the drawings are designed solely for the purposes of illustration and not as a definition of the limits of the invention. In the drawings, like reference numerals are used to refer to like elements throughout. Wherein:
fig. 1 is a schematic diagram of the overall structure of the magnetic stimulation system of the present invention;
FIG. 2 is a schematic diagram of the overall structure of the magnetic stimulation system in one embodiment of the present invention;
FIG. 3 is a schematic view of a heat dissipation system of the present invention;
FIG. 4 is a flow chart of a control method of the magnetic stimulation system of the present invention;
FIG. 5 is a temperature rise curve chart of a large 8-word coil under the same parameter;
FIG. 6 is a temperature rise plot of a large 8-word coil using power limiting under different parameters;
FIG. 7 is a graph of temperature rise for a large 8-word coil without power limitation under different parameters;
FIG. 8 is a temperature rise curve chart of a large circular coil and a large 8-word coil under the same parameter.
Detailed Description
In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the invention is further described in detail with reference to the attached drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution to which the present invention relates.
According to the technical scheme of the invention, a plurality of alternative structural modes and implementation modes can be provided by a person with ordinary skill in the art without changing the essential spirit of the invention. Therefore, the following detailed description and the accompanying drawings are merely illustrative of the technical aspects of the present invention, and should not be construed as limiting or restricting the technical aspects of the present invention.
The technical solution of the present invention is further described in detail with reference to the accompanying drawings and examples.
Embodiment 1, as shown in fig. 1, an output power adaptive control system for magnetic stimulation includes an upper computer subsystem, a lower computer subsystem, and a heat dissipation system, where the upper computer subsystem and the lower computer subsystem are in communication connection in a wired manner, the heat dissipation system is respectively connected to the upper computer subsystem and the lower computer subsystem, and a main control module in the lower computer subsystem receives stimulation output parameters sent by the upper computer subsystem and outputs a pulsed magnetic field in order.
The upper computer subsystem comprises a core board and a human-computer interaction module connected with the core board, and is used for editing parameters of magnetic stimulation output, controlling the start and the end of magnetic stimulation, adjusting the strength of the stimulation output during the magnetic stimulation output, and displaying magnetic stimulation information such as stimulation time, a stimulation state, coil temperature and the like.
The lower computer subsystem comprises a main control module, a power supply filter and at least one path of magnetic stimulation coil, wherein each path of magnetic stimulation coil is respectively connected with the main control module and the power supply filter, and the lower computer subsystem is used for generating a pulse magnetic field.
The heat dissipation system comprises a heat dissipation control module and a heat dissipation device, wherein the input end of the heat dissipation control module is connected with the core board, the output end of the heat dissipation control module is connected with the heat dissipation device, and the heat dissipation system is used for cooling the stimulation coil and the host.
The main control module in the lower computer subsystem receives the stimulation output parameters sent by the upper computer subsystem and outputs the pulse magnetic field in sequence; the upper computer subsystem adjusts the intensity of the stimulation output and sends the intensity to the lower computer subsystem, and the lower computer subsystem adjusts the charging voltage according to the intensity.
Specifically, the stimulation output parameters received by the main control module from the upper computer subsystem include the number of circles in the coil, the conductivity of the winding lead, the thickness of the coil, the outer diameter of the coil, the inner diameter of the coil, the total time of one stimulation cycle, the duty ratio, the duration of a single stimulation pulse, the interval time between two adjacent pulses, the maximum voltage of the system, the total equivalent resistance of the system, the stimulation intensity and other magnetic stimulation information. Then the main control module enters a stimulation output preparation state, after the upper computer subsystem issues a start instruction, the lower computer subsystem main control module controls the boosting power supply to charge the pulse capacitor and output a pulse magnetic field according to preset stimulation output parameters, at the moment, the upper computer can adjust the strength of stimulation output and issue the strength to the lower computer subsystem, and the lower computer subsystem adjusts the charging voltage according to the strength.
Through the mode, when the relationship between the magnetic stimulation output frequency and the stimulation output time and the stimulation interval time and the strength is balanced, the heat dissipation system of the magnetic stimulation equipment can meet the requirement of continuous and stable work of the equipment so as to meet the normal use of the equipment by people, and the highest level of the magnetic stimulation equipment can be exerted.
As a preferred scheme, each magnetic stimulation coil includes at least one path of boosting power supply and one path of coil, an output end of each path of boosting power supply is connected with one path of pulse capacitor, and the pulse capacitor is connected with the coil.
For example, multiple magnetic stimulation coils are arranged, wherein a first path of boosting power supply is connected with the first path of coil through a first path of pulse capacitor; the second path of boosting power supply is connected with the second path of coil through the second path of pulse capacitor; the third path of boosting power supply is connected with the third path of coil through a third path of pulse capacitor; and so on.
Referring to fig. 2, as a preferred scheme, each magnetic stimulation coil includes a boosting power supply and at least one coil, an output end of the boosting power supply is connected to a pulse capacitor, and the pulse capacitor is connected to the at least one coil.
For example, after one path of boost power supply is connected with one path of pulse capacitor, the pulse capacitor is connected with multiple paths of coils, such as a first path of coil, a second path of coil and a third path of coil, wherein the winding speed is 8230
Referring to fig. 3, in the above solution, the heat dissipation device includes a pump, a water tank, and a fan, and the output end of the heat dissipation control module is respectively connected to the pump, the water tank, and the fan to control each heat dissipation device one by one, so as to adjust the heat dissipation device in time according to the feedback data. The pump is connected with the water tank through a flow sensor, and the flow sensor can also transmit data to the heat dissipation control module; the heat dissipation control module is connected with the water tank through a liquid level sensor so as to obtain the liquid level of the water tank; the water tank is connected with the lower computer subsystem through the separator, and can be used for connecting each coil in the lower computer subsystem one by one, and each coil feeds back heat data to the impeller pump or the heat dissipation control module so as to further control the output function of the heat dissipation device; the fan is connected with the heat dissipation control module through the rotating speed feedback module so as to obtain the output power of the fan, and the rotating speed of the fan can be adjusted to further change the output power of the fan. In addition, the fan not only acts on the host equipment, but also acts on the water tank to dissipate heat for the water tank.
Embodiment 2, referring to fig. 4, a control method of an output power adaptive control system for magnetic stimulation includes the following steps:
s1: selecting the type of magnetic stimulation coil, obtaining relevant parameters of the current magnetic stimulation coil, such as obtaining N, rho, b, R out ，R in ,R S The like;
s2: editing stimulus output parameters and issuing stimulus output parameters, e.g. issuing T, D, T P ，T G ，U m W and the like;
s3: starting stimulation output, judging whether the stimulation intensity changes or not, and calculating the current output intensity W if the stimulation intensity changes; if not, continuously monitoring whether the intensity changes;
s4: judging whether the intensity adjusted by the system is greater than the current intensity W, if so, prompting that the adjustment is not allowed, and issuing the intensity; if not, directly issuing the intensity; and finally, continuously repeating the steps S3 and S4, and continuously monitoring the intensity.
In the above scheme, after the actual system parameters are obtained, the maximum output power P of the system is kept unchanged, and the maximum output intensity W of the system at that time is calculated when other system parameters are changed.
Further, the maximum output power P of the system is the joule power of the whole stimulation coil:
the maximum output intensity W obtained by conversion is:
wherein N is the number of circles in the coil, the big circle N is 1, the splayed N is 2, rho is the conductivity of the winding wire, b is the thickness of the coil, and R is out Is the outer diameter of the coil, R in Is the coil inner diameter, T is the total time of one stimulation cycle, D is the duty cycle (the ratio of the stimulation output time to the total cycle), T P Duration of a single stimulation pulse, T G Is the interval time of two adjacent pulses, U m Is the highest voltage of the system, R S W is the output intensity for the total equivalent resistance of the system.
In embodiment 3, when a control method of an output power adaptive control system for magnetic stimulation is applied, because the composition of a heat dissipation system is different between different types of devices, for example, the heat dissipation capability is different between different heat dissipation modes, or the heat dissipation systems designed in different application scenarios of a transcranial magnetic stimulator and a pelvic floor magnetic stimulator are different. The scheme is used for various types of magnetic stimulation equipment, but the strong correlation with a heat dissipation system is involved, so that actual tests need to be carried out on different types of equipment, and the actual tests also need to be carried out on the same equipment type when different coil types are used.
The following description is based on the same heat dissipation system:
for example, a certain magnetic stimulation device is provided with a certain coil, a parameter of stimulation output which can continuously work is fitted according to the maximum intensity of the stimulation coil, the Q value of the stimulation coil, the heat dissipation capacity of the device, application requirements, application scenes, application environments and the like, and actual verification is carried out according to the stimulation parameter.
Firstly, recording the starting temperature of the coil before stimulation is started, starting stimulation output, recording the temperature change of the coil in the process, and then observing whether the coil exceeds the safe temperature. The scheme can use 40 ℃ as the safe temperature, and if the temperature of the system does not exceed the safe temperature all the time, whether the system reaches the thermal equilibrium or not is observed, and the temperature rise when the system reaches the thermal equilibrium is what. And then, continuously adjusting the parameters of the stimulation output, namely the magnetic stimulation frequency and the stimulation output time, and the stimulation interval time according to the test result to finally obtain a power parameter which can continuously work for the system of the type.
The coil types are changed and the test is carried out again, but the temperature rise curves of similar coil types such as a large circle coil, a large 8-word coil and the like are directly compared by using coils with basically the same maximum strength and application, and if the difference is not large, the temperature rise curves can be simply and uniformly planned.
Different device types or different heat dissipation systems may also operate as described above.
In order to verify the accuracy and effectiveness of the power limiting strategy provided by the invention, the magnetic stimulation equipment, namely a heat dissipation system is used for determining, and actual test is carried out. By way of example, reference is made to fig. 5 to 8 for comparative data obtained.
Fig. 5 shows the same stimulation output parameters using a large 8-word coil: n =2, output T G The output duty ratio is 0.2, the output duty ratio is 100%, the stimulation intensity is 100%, the temperature change trend under different initial temperatures is tested, the graph shows that the stimulation output and the initial temperature under the same condition have no relation, the heat balance can be achieved within 60 minutes, and the temperature rise is basically the same.
FIG. 6 is a graph of using a power limiting strategy with T for a large 8-word coil G (1) =0.2, d (1) =100%, W (1) =100%, and T is calculated G (2)＝0.05，D(2)＝At 50%, W (2) =100% temperature change curve, and it can be seen in the figure that the temperature change curves are the same, which indicates that the accuracy of the strategy is high.
FIG. 7 shows the unused power limit strategy using a large 8 word coil, denoted T G (3) =0.2,d (3) =100%, W (3) =100%, when T is satisfied G (4) The temperature change curve of the power-limiting strategy is directly W (4) =100%, the temperature rise of the curve without limitation is fast, the safety temperature is reached after more than 20 minutes, and the output is stopped, so that the strategy is high in effectiveness.
Fig. 8 is a temperature change curve of the large circular coil and the large 8-word coil when the large circular coil and the large 8-word coil output under the same stimulation parameters, because the maximum strength of the large circular coil and the large 8-word coil is the same, and the application is also similar, the graph shows that the temperature rise curves of the large circular coil and the large 8-word coil are similar, and the temperature reduction effect of the large circular coil is obviously better than that of the large 8-word coil. If the reference of the large 8-word coil can meet the clinical application of the large circle coil, the large circle can use one set of reference with the large 8-word coil, or test verification can be carried out independently.
When the existing equipment is used for magnetic stimulation output, the strength can be infinitely adjusted to cause that the coil is overheated, the magnetic field output has to be stopped to wait for cooling, and therefore clinical use is influenced. The existing scheme mostly limits the maximum strength which can be achieved under a certain frequency or a certain parameter scheme by cutting, and the scheme adaptively calculates the maximum strength which can be output under the parameters according to the frequency, the output time, the interval time and the type of the stimulating coil, so that the magnetic stimulation equipment can normally and continuously output without the phenomenon of insufficient strength or frequent over-temperature, and the experience of clinical application is ensured.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. An output power adaptive control system for magnetic stimulation, characterized by: the system comprises an upper computer subsystem, a lower computer subsystem and a heat dissipation system, wherein the upper computer subsystem is connected with the lower computer subsystem, and the heat dissipation system is respectively connected with the upper computer subsystem and the lower computer subsystem;
the upper computer subsystem comprises a core board and a man-machine interaction module connected with the core board, and is used for editing parameters of magnetic stimulation output, controlling the start and the end of magnetic stimulation, adjusting the intensity of the stimulation output during the magnetic stimulation output and displaying magnetic stimulation information;
the lower computer subsystem comprises a main control module, a power supply filter and at least one path of magnetic stimulation coil, wherein each path of magnetic stimulation coil is respectively connected with the main control module and the power supply filter, and the lower computer subsystem is used for generating a pulse magnetic field;
the cooling system comprises a cooling control module and a cooling device, wherein the input end of the cooling control module is connected with the core board, the output end of the cooling control module is connected with the cooling device, and the cooling system is used for cooling the stimulating coil and the host.
2. An adaptive control system for output power of magnetic stimulation according to claim 1, characterized by: the main control module in the lower computer subsystem receives the stimulation output parameters issued by the upper computer subsystem and outputs the pulse magnetic field in sequence; the upper computer subsystem adjusts the intensity of the stimulation output and sends the intensity to the lower computer subsystem, and the lower computer subsystem adjusts the charging voltage according to the intensity.
3. An adaptive control system for output power of magnetic stimulation according to claim 1, characterized by: each magnetic stimulation coil comprises at least one path of boosting power supply and one path of coil, the output end of each path of boosting power supply is connected with one path of pulse capacitor, and the pulse capacitor is connected with the coil.
4. An output power adaptive control system for magnetic stimulation according to claim 3, characterized in that: each magnetic stimulation coil comprises a boosting power supply and at least one coil, the output end of the boosting power supply is connected with a pulse capacitor, and the pulse capacitor is connected with the at least one coil.
5. An output power adaptive control system for magnetic stimulation according to claim 1, characterized in that: the heat dissipation device comprises a pump, a water tank and a fan, wherein the output end of the heat dissipation control module is respectively connected with the pump, the water tank and the fan, and the pump is connected with the water tank through a flow sensor; the heat dissipation control module is connected with the water tank through a liquid level sensor; the water tank is connected with the lower computer subsystem through the separator, and the fan is connected with the heat dissipation control module through the rotating speed feedback module.
6. The control method of the output power adaptive control system for magnetic stimulation according to claim 1, characterized by comprising the steps of:
s1: selecting the type of the magnetic stimulation coil, and acquiring related parameters of the current magnetic stimulation coil;
s2: editing stimulation output parameters and issuing the stimulation output parameters;
s3: starting stimulation output, judging whether the stimulation intensity changes or not, and calculating the current output intensity W if the stimulation intensity changes;
s4: and judging whether the intensity adjusted by the system is greater than the current intensity W or not, if so, prompting that the adjustment is not allowed, otherwise, issuing the intensity, and repeating the step S3.
7. The adaptive control method of output power for magnetic stimulation according to claim 6, wherein: and after obtaining the actual parameters of the system, keeping the highest output power P of the system unchanged, and calculating the highest output intensity W of the system at the moment when other parameters of the system are changed.
8. The adaptive control method of output power for magnetic stimulation according to claim 7, wherein: the maximum output power P of the system is the Joule power of the whole stimulating coil:
wherein N is the number of circles in the coil, the big circle N is 1, the splayed N is 2, rho is the conductivity of the winding wire, b is the thickness of the coil, and R is out Is the outer diameter of the coil, R in Is the coil inner diameter, T is the total time of one stimulation cycle, D is the duty cycle, T P Duration of a single stimulation pulse, T G Is the interval time of two adjacent pulses, U m Is the highest voltage of the system, R S W is the output intensity for the total equivalent resistance of the system.
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| US11794029B2 (en) | 2016-07-01 | 2023-10-24 | Btl Medical Solutions A.S. | Aesthetic method of biological structure treatment by magnetic field |
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