CN112564312B - Visual prosthesis wireless power supply system with self-shielding function and control method thereof - Google Patents
Visual prosthesis wireless power supply system with self-shielding function and control method thereof Download PDFInfo
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- 230000000007 visual effect Effects 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000006243 chemical reaction Methods 0.000 claims abstract description 17
- 230000001105 regulatory effect Effects 0.000 claims abstract description 14
- 230000005670 electromagnetic radiation Effects 0.000 claims abstract description 8
- 238000001514 detection method Methods 0.000 claims description 53
- 230000000638 stimulation Effects 0.000 claims description 22
- 230000006698 induction Effects 0.000 claims description 8
- 230000001276 controlling effect Effects 0.000 claims description 7
- 230000004907 flux Effects 0.000 claims description 5
- 230000005855 radiation Effects 0.000 claims description 4
- 238000001356 surgical procedure Methods 0.000 claims description 4
- 210000005036 nerve Anatomy 0.000 claims description 3
- 230000004936 stimulating effect Effects 0.000 claims description 3
- 230000001939 inductive effect Effects 0.000 claims description 2
- 238000009434 installation Methods 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 abstract description 9
- 208000015181 infectious disease Diseases 0.000 abstract description 3
- 210000001519 tissue Anatomy 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000006378 damage Effects 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001727 in vivo Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 208000022873 Ocular disease Diseases 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007943 implant Substances 0.000 description 1
- 238000000338 in vitro Methods 0.000 description 1
- 210000000944 nerve tissue Anatomy 0.000 description 1
- 210000001328 optic nerve Anatomy 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 210000000239 visual pathway Anatomy 0.000 description 1
- 230000004400 visual pathway Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/18—Applying electric currents by contact electrodes
- A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
- A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
- A61N1/36046—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation of the eye
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
- H02J50/402—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/70—Circuit arrangements or systems for wireless supply or distribution of electric power involving the reduction of electric, magnetic or electromagnetic leakage fields
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
Abstract
The invention discloses a visual prosthesis wireless power supply system with a self-shielding function and a control method thereof, and belongs to the field of biomedical engineering. The visual prosthesis wireless power supply system with the self-shielding function comprises an implantable visual prosthesis, wherein the visual prosthesis wireless power supply system comprises an external electric energy transmitting end device, an external leakage magnetic field regulating device and an implantable electric energy receiving end device, and the external electric energy transmitting end device is used for generating a high-frequency alternating magnetic field in a space and transmitting energy to the implantable electric energy receiving end device; the external leakage magnetic field regulating device is used for detecting and generating a counteracting magnetic field so as to shield the leakage magnetic field generated by the external electric energy transmitting end device on the face of the human body and reduce electromagnetic radiation; the implantable electric energy receiving end device is used for receiving the energy sent by the external electric energy transmitting end device and supplying power to the implantable visual prosthesis. The invention avoids the problems of biological tissue infection, rejection reaction and the like caused by the wire interface in the traditional wired transmission, and reduces the operation risk.
Description
Technical Field
The invention relates to a visual prosthesis wireless power supply system with a self-shielding function and a control method thereof, belonging to the field of biomedical engineering.
Background
For some ocular disorders caused by damage to the visual system, microcurrent stimulation of optic nerve tissue may be used to restore vision to blind patients. With the development of the related art, an implantable medical device, namely a visual prosthesis, becomes an effective treatment scheme. The scheme can bypass the damaged part in the human visual pathway, and the undamaged nerve tissue is stimulated by micro-current generated by the implanted stimulation electrode, so that the purpose of restoring vision is achieved.
The implanted portions of the ocular prosthesis, such as the data receiving unit, the microcurrent stimulation controller and the stimulation electrodes, etc., all require a steady supply of energy to function properly, and conventional in vivo energy supply devices typically employ implanted batteries. Limited by the limited energy density and short service life of the battery, patients often need to perform secondary surgery periodically to replace the implanted battery after a period of time to install the visual prosthesis, which increases the risk of the surgery that the patient needs to bear, increases the cost of the surgery, and increases the pain of the patient. The development of wireless power transmission technology provides a good solution to the above problems. The technology takes a magnetic field as a medium, and energy is transmitted into a receiving coil in the body in a wireless way through an external transmitting coil, so that the stable energy supply of the implantable visual prosthesis is realized.
At present, students at home and abroad develop related researches around a wireless power supply system applied to a visual prosthesis. Patent publication No. CNIO2813999a proposes a visual prosthesis wireless transmission system with a power adaptive adjustment function, which adjusts the input power of a transmitting coil by predicting the energy required to implant a stimulation electrode. Patent publication number CNIO3272329 proposes an artificial visual prosthesis device with wireless energy transmission function, through which an embedded controller can invoke an implanted storage battery to supply power to the visual prosthesis device when wireless charging is cut off. The literature [ design of wireless transmission system of energy in visual prosthesis [ D ]. University of western electrotechnical university, 2019 ] devised a wireless power supply system for visual prosthesis, by adding an in vivo data reverse transmission unit, the charging state of the implantable visual prosthesis can be monitored in real time. However, the prior art focuses on basic functions such as transmission power and transmission efficiency of the wireless power supply system, ignores the harm of electromagnetic radiation generated by the wireless power supply system during normal operation to human bodies, and does not consider related electromagnetic shielding measures, so that the face of a patient is completely exposed to a high-frequency electromagnetic environment during the charging process. On the one hand, the leakage magnetic field generated by the coil can generate a thermal effect in human tissues to damage more sensitive organs or tissues. On the other hand, the high-frequency leakage magnetic field may generate electromagnetic interference to the devices such as the implanted micro-current stimulation controller and the stimulation electrode, and affect the normal operation of the devices.
Disclosure of Invention
Aiming at the defects existing in the existing research, the invention provides a wireless power supply system of a visual prosthesis with a self-shielding function and a control method thereof, and provides power supply for the implanted visual prosthesis in a wireless mode through mutual inductance coupling between a transmitting coil and a receiving coil, thereby avoiding the problems of biological tissue infection, rejection reaction and the like caused by a wire interface in the traditional wired transmission and reducing the operation risk. Meanwhile, through the magnetic field detection coil and the active shielding coil, the leakage magnetic field generated by the coupling coil can be effectively shielded in the normal working process of the system, so that the main magnetic flux is focused, the purpose of reducing the leakage magnetic flux is achieved, the electromagnetic radiation generated by the system to a human body and implanted electronic equipment is reduced, and the self-shielding function of the wireless power supply system is achieved.
The visual prosthesis wireless power supply system with the self-shielding function comprises an implantable visual prosthesis, wherein the visual prosthesis wireless power supply system comprises an external electric energy transmitting end device, an external leakage magnetic field regulating device and an implantable electric energy receiving end device,
the external electric energy transmitting end device is used for generating a high-frequency alternating magnetic field in space and transmitting energy to the implanted electric energy receiving end device;
the external leakage magnetic field regulating device is used for detecting and generating a counteracting magnetic field so as to shield the leakage magnetic field generated by the external electric energy transmitting end device on the face of the human body and reduce electromagnetic radiation;
the implantable electric energy receiving end device is used for receiving the energy sent by the external electric energy transmitting end device and supplying power to the implantable visual prosthesis.
Further, the external electric energy transmitting end device comprises an E-type amplifier, a compensating circuit and a transmitting coil, wherein the output end of the E-type amplifier is connected with the compensating circuit, the output end of the compensating circuit is connected with the transmitting coil,
the class E amplifier is used for outputting high-frequency voltage of MHz level;
the compensation circuit is used for compensating the self inductance of the transmitting coil and eliminating reactive power in the system;
the transmitting coil is used for exciting a high-frequency magnetic field in space after high-frequency current is introduced.
Further, the external leakage magnetic field regulating device comprises an active shielding coil, a magnetic field detection coil, a signal conversion device, a DSP controller, a unit control circuit and a shielding coil compensation circuit, wherein the magnetic field detection coil, the signal conversion device, the DSP controller, the unit control circuit, the shielding coil compensation circuit and the active shielding coil are connected in sequence,
the magnetic field detection coil is used for detecting a voltage signal sent by the transmitting coil;
the signal conversion device is used for converting the detected voltage signal into a magnetic field signal;
the DSP controller and the unit control circuit are used for controlling the conduction of the active shielding coil according to the magnetic field signal;
the active shielding coil is used for being controlled by the unit control circuit to be conducted and generating a counteracting magnetic field.
Further, the visual prosthesis wireless power supply system further comprises an eye shield, and the magnetic field detection coil and the active shielding coil are integrated in the eye shield.
Further, the plurality of magnetic field detection coils are arranged on one side, close to a human body, of the eye cover, are rectangular or circular, the sizes of the coils in the plurality of coils are the same, and the output end of each magnetic field detection coil is connected with the signal conversion device positioned outside the eye cover; the active shielding coils are arranged on the outer sides of the eyeshade and correspond to the magnetic field detection coils one by one; each active shielding coil is connected with the compensation circuit respectively.
Further, the implantable electric energy receiving end device is implanted in the human body through operation and comprises a receiving coil, a compensating circuit, a rectifying circuit, an implantable battery, a microelectrode stimulation controller and a stimulation electrode, wherein the receiving coil, the compensating circuit, the rectifying circuit, the implantable battery, the microelectrode stimulation controller and the stimulation electrode are connected in sequence,
the receiving coil is used for inducing high-frequency voltage in the high-frequency magnetic field;
the compensation circuit is used for compensating the self inductance of the receiving coil and reducing the inductance of the receiving coil;
the rectification circuit is used for converting alternating current energy into direct current energy;
the implantable battery is used for storing electric energy;
the microelectrode stimulation controller is used for generating a control signal to control the stimulation electrode;
the stimulating electrode is used for repairing the visual nerve.
Further, the compensation circuit adopts series compensation.
Further, the rectifying circuit is an uncontrolled rectifying circuit.
A control method of a visual prosthesis wireless power supply system with a self-shielding function, based on the visual prosthesis wireless power supply system with the self-shielding function, the control method comprises the following steps:
step 1, initializing a system, enabling k=0, supplying power to an E-type amplifier in an external power transmitting end device, and generating a magnetic field by a transmitting coil, wherein k represents a calculation step length and satisfies k=0, 1,2 and 3 …;
step 2, reading the induction voltage value U in each coil of the n magnetic field detection coils 1 ..U i ..U n Wherein i=1, 2 … n;
step 3, the voltage signal U in the magnetic field detection coil is converted by the signal conversion device 1 ..U i ..U n Converted into magnetic field signal B 1 ..B i ..B n ；
Step 4: contrast magnetic field signal B i Maximum magnetic field limit B specified in international standard max If all the magnetic field signals are smaller than the specified magnetic field maximum limit value, the system leakage magnetic field meets the requirement, and an active shielding coil is not required to be opened; if the magnetic field signal is larger than the specified magnetic field maximum limit value, determining the position of a detection coil with the exceeding magnetic field, and further determining the region with the exceeding magnetic field;
step 5: based on the determined region with the exceeding magnetic field, the active shielding coil of the region is conducted through the DSP controller and the unit control circuit;
step 6: judging whether all the active shielding coils are all started, if so, repeating the steps 2 to 5 until all the magnetic field signals are smaller than the specified magnetic field maximum limit value; if all the active shielding coils are conducted, enabling k=k+1;
step 7: judging whether k is greater than 1, if k is greater than 1, indicating that the system magnetic leakage radiation still exceeds the standard when all the active shielding coils are opened, outputting a magnetic field exceeding signal at the moment, and closing an E-type amplifier in the external electric energy transmitting end device; if k is less than or equal to 1, the step 2 is repeated, and magnetic field signals in the coils are detected until all the magnetic field signals are smaller than the specified magnetic field maximum limit value.
Further, the method for converting the voltage signal into the magnetic field signal in the step 3 specifically includes the following steps:
in a high-frequency magnetic field environment, the expression of the effective value U of the induced voltage in the single magnetic field detection coil satisfies the following conditions:
U＝ω·Φ＝ω·B av ·S·N t (1)
where ω represents the operating angular frequency of the system, Φ represents the total magnetic flux through the magnetic field sensing coil, B av Represents the average magnetic induction intensity passing through the magnetic field detection coil, S represents the area of the detection coil, N t Indicating the number of turns of the detection coil;
thus, the average magnetic induction through the magnetic field detection coil is calculated by:
by the above formula, the voltage signal measured in the magnetic field detection coil is converted into a magnetic field signal.
The invention has the main advantages that: the invention can supply power for the implantable visual prosthesis in a wireless mode, avoids the problems of biological tissue infection, rejection reaction and the like caused by a wire interface in the traditional visual prosthesis adopting a wired charging mode, and reduces the operation risk and operation cost which need to be born by patients. Meanwhile, the magnetic field detection coil in the system can detect the size of the face magnetic leakage radiation in real time in the working process of the system, and the active shielding coil is controlled to generate a counteracting magnetic field, so that magnetic field regulation and control are carried out, electromagnetic radiation to human face tissues and implanted electronic equipment in the working process of the system is reduced, and the electromagnetic safety of the system is improved. In addition, the active shielding coil adopts an array coil structure, and each coil is independently controlled, so that modularization of magnetic field regulation and control can be realized, and the control can be accurately performed on an electromagnetic radiation exceeding area.
Drawings
FIG. 1 is a system block diagram of a visual prosthesis wireless power supply system with self-shielding function according to the present invention;
FIG. 2 is a schematic structural diagram of an external leakage magnetic field control device according to the present invention;
FIG. 3 is a schematic diagram of a magnetic field detecting coil according to the present invention;
FIG. 4 is a schematic diagram of an active shielding coil according to the present invention;
fig. 5 is a flowchart of a control method of a wireless power supply system for a visual prosthesis with a self-shielding function according to the present invention.
Wherein 1 is an in-vitro electric energy transmitting end device; 2 is an external leakage magnetic field regulating device; 21 is the outer side surface of the external leakage magnetic field regulating device; 22 is the inner side surface of the external leakage magnetic field regulating device; 3 is an implantable power receiving device; 4 is a magnetic field detection coil; and 5 is an active shielding coil.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, the visual prosthesis wireless power supply system with the self-shielding function comprises three parts, wherein the first part is an external electric energy transmitting end device 1, the second part is an external leakage magnetic field regulating and controlling device 2, and the third part is an implanted electric energy receiving end device 3; the external electric energy transmitting end device 1 has the functions of generating a high-frequency alternating magnetic field in space and transmitting energy to the electric energy receiving end device 3; the external leakage magnetic field regulating and controlling device 2 has the functions of detecting and generating a counteracting magnetic field to effectively shield the leakage magnetic field generated by the transmitting coil on the face of a human body and reduce electromagnetic radiation; the implantable electric energy receiving end device 3 is implanted into the human body through operation and has the functions of receiving energy and supplying power to the implantable visual prosthesis;
the external electric energy transmitting end device 1 comprises an E-type amplifier, a compensation circuit and a transmitting coil; the E-class amplifier is powered by a direct-current power supply, the output end of the E-class amplifier is connected with the compensation circuit, and the E-class amplifier outputs a MHz-level high-frequency voltage with constant amplitude to provide constant power input for the transmitting coil; the output end of the compensation circuit is connected with the transmitting coil, and can adopt series compensation, parallel compensation and compound compensation according to the circuit characteristics of the system, and the compensation circuit is used for compensating the self inductance of the transmitting coil and eliminating reactive power in the system; meanwhile, the resonant frequency of the compensation network is consistent with the working frequency of the system; the transmitting coil is a round coil or a rectangular coil wound by multi-turn litz wires, and the number of turns of the coil is determined by the transmitting current and the charging voltage required by the implanted battery; a high-frequency current with a constant effective value is introduced into the transmitting coil, a high-frequency magnetic field is generated in the space, and power is supplied to the visual prosthesis;
as shown in fig. 2 and 3, the external leakage magnetic field regulating device 2 comprises an eye shield integrated with a magnetic field detection coil 4 and an active shielding coil 5, an external signal conversion device, a DSP controller, a unit control circuit and a shielding coil compensation circuit; the magnetic field detection coil 4 is arranged on the inner surface 22 of the eyeshade, is connected with a signal conversion device and a DSP controller outside the eyeshade, and converts the voltage signal in the magnetic field detection coil 3 into a magnetic field signal through reading the voltage signal in the magnetic field detection coil 3, so that the DSP controller is used for controlling the conduction of each coil in the active shielding coil 4 to generate a counteracting magnetic field;
further, the magnetic field detection coil 4 is a plurality of rectangular or circular coils, and is mounted on the inner side 22 of the eye shield, and includes n independent sub-coils, where n is a positive integer; the sizes of all the sub-coils are identical, and the output ends of the sub-coils are connected with a signal conversion device outside the eyeshade;
as shown in fig. 2 and 4, the active shielding coil 5 is mounted on the outer side 21 of the eye shield, and includes n independent sub-shielding coils, where n is a positive integer; the structure of the active shielding coil 5 is a rectangular or circular coil, the active shielding coil is the same as the structure of the magnetic field detection coil 4, and the installation position of each sub shielding coil corresponds to the position of the magnetic field detection coil 4; each active shielding coil is respectively connected with the compensation circuit, and then is connected with the unit control circuit; the control unit circuit is connected in parallel with the output end of the class E power amplifier, so that the current phase in the active shielding coil 5 is guaranteed to be in phase with the current phase in the transmitting coil;
furthermore, in the working process of the wireless power supply system, a patient needs to wear an eye shield, so that the magnetic field detection and leakage magnetic field shielding functions are realized;
the implantable electric energy receiving end device 3 is implanted into the human body through operation and comprises a receiving coil, a compensation circuit, a rectifying circuit, an implanted battery, a microelectrode stimulation controller and a stimulation electrode; the axis of the receiving coil is parallel to the transmitting coil, and the area of the receiving coil is S and smaller than that of the transmitting coil; after a magnetic field generated by the transmitting coil induces high-frequency voltage in the receiving coil, the high-frequency voltage is supplied to the implanted battery through the compensating circuit and the rectifying circuit, then a control signal is generated through the microelectrode stimulation controller, and the visual nerve is repaired through the stimulating electrode;
further, the receiving end compensation circuit adopts series compensation, and is used for compensating the self inductance of the receiving coil, reducing the inductance of the receiving end, and the resonant frequency of the compensation circuit is consistent with the working frequency of the system;
further, the rectification circuit is an uncontrolled rectification circuit;
the invention also provides a control method of the visual prosthesis wireless power supply system with the self-shielding function, a flow chart of which is shown in figure 5, and the method is characterized in that:
the control method of the visual prosthesis wireless power supply system with the self-shielding function comprises the following 7 basic steps:
step 1: initializing a system, enabling k=0, supplying power to an E-type amplifier in an external power transmitting end device, and generating a magnetic field by a transmitting coil;
step 2: reading the induced voltage value U in each of the n magnetic field detection coils 1 ..U i ..U n Wherein i=1, 2 … n;
step 3: the voltage signal U in the magnetic field detection coil is converted by the signal conversion device 1 ..U i ..U n Converted into magnetic field signal B 1 ..B i ..B n ；
Step 4: contrast magnetic field signal B i Maximum magnetic field limit B specified in international standard max If all the magnetic field signals are smaller than the specified magnetic field maximum limit value, the system leakage magnetic field meets the requirement, and an active shielding coil is not required to be opened; if the magnetic field signal is larger than the specified magnetic field maximum limit value, determining the position of a detection coil with the exceeding magnetic field, and further determining the region with the exceeding magnetic field;
step 5: based on the determined region with the exceeding magnetic field, the active shielding coil of the region is conducted through the DSP controller and the unit control circuit;
step 6: judging whether all the active shielding coils are all started, if so, repeating the steps 2 to 5 until all the magnetic field signals are smaller than the specified magnetic field maximum limit value; if all the active shielding coils are conducted, enabling k=k+1;
step 7: judging whether k is greater than 1, if k is greater than 1, indicating that the system magnetic leakage radiation still exceeds the standard when all the active shielding coils are opened, outputting a magnetic field exceeding signal at the moment, and closing an E-type amplifier in the external electric energy transmitting end device; if k is less than or equal to 1, returning to the step 2, and detecting magnetic field signals in each coil until all the magnetic field signals are smaller than the specified magnetic field maximum limit value;
detailed description of the preferred embodiments
The first embodiment will be further described. In the control method of the visual prosthesis wireless power supply system with the self-shielding function, the method for converting the voltage signal into the magnetic field signal in the step 3 is specifically as follows
In a high-frequency magnetic field environment, the expression of the effective value U of the induced voltage in a single detection coil meets the following conditions:
U＝ω·Φ＝ω·B av ·S·N t (3)
where ω represents the operating angular frequency of the system, Φ represents the total magnetic flux through the magnetic field sensing coil, B av Represents the average magnetic induction intensity passing through the magnetic field detection coil, S represents the area of the detection coil, N t Indicating the number of turns of the detection coil;
thus, the average magnetic induction through the detection coil can be calculated by:
the voltage signal measured in the detection coil can be converted into a magnetic field signal by the above equation.
Claims (9)
1. A control method of a visual prosthesis wireless power supply system with a self-shielding function, which is based on a visual prosthesis wireless power supply system with a self-shielding function, wherein the visual prosthesis wireless power supply system with the self-shielding function comprises an implantable visual prosthesis, the visual prosthesis wireless power supply system comprises an external electric energy transmitting end device (1), an external leakage magnetic field regulating device (2) and an implantable electric energy receiving end device (3), wherein the external electric energy transmitting end device (1) is used for generating a high-frequency alternating magnetic field in a space and transmitting energy to the implantable electric energy receiving end device (3); the external leakage magnetic field regulating device (2) is used for detecting and generating a counteracting magnetic field so as to shield the leakage magnetic field generated by the external electric energy transmitting end device (1) on the face of a human body and reduce electromagnetic radiation; the implantable electric energy receiving end device (3) is used for receiving the energy sent by the external electric energy transmitting end device (1) and supplying power to the implantable visual prosthesis,
the control method is characterized by comprising the following steps:
step 1, initializing a system, enabling k=0, supplying power to an E-type amplifier in an external power transmitting end device (1), and generating a magnetic field by a transmitting coil, wherein k represents a calculation step length and satisfies k=0, 1,2 and 3 …;
step 2, reading the induction voltage value U in each coil in the n magnetic field detection coils (4) 1 ..U i ..U n Wherein i=1, 2 … n;
step 3, the voltage signal U in the magnetic field detection coil (4) is converted by a signal conversion device 1 ..U i ..U n Converted into magnetic field signal B 1 ..B i ..B n ；
Step 4: contrast magnetic field signal B i Maximum magnetic field limit B specified in international standard max If all magnetic field signals are smaller than the specified magnetic field maximum limit value, the system leakage magnetic field meets the requirement, and an active shielding coil (5) is not required to be opened; if the magnetic field signal is larger than the specified magnetic field maximum limit value, determining the position of a detection coil with the exceeding magnetic field, and further determining the region with the exceeding magnetic field;
step 5: based on the determined region with the exceeding magnetic field, the active shielding coil (5) of the region is conducted through the DSP controller and the unit control circuit;
step 6: judging whether all the active shielding coils (5) are all started, if the active shielding coils (5) which are not started exist, repeating the steps 2 to 5 until all the magnetic field signals are smaller than the specified magnetic field maximum limit value; if all the active shielding coils (5) are conducted, enabling k=k+1;
step 7: judging whether k is greater than 1, if k is greater than 1, indicating that the system magnetic leakage radiation still exceeds the standard when all the active shielding coils (5) are opened, outputting a magnetic field exceeding signal at the moment, and closing an E-type amplifier in the external electric energy transmitting end device (1); if k is less than or equal to 1, the step 2 is repeated, and magnetic field signals in the coils are detected until all the magnetic field signals are smaller than the specified magnetic field maximum limit value.
2. The method for controlling a wireless power supply system for a visual prosthesis with a self-shielding function according to claim 1, wherein the method for converting the voltage signal into the magnetic field signal in the step 3 is specifically as follows:
in a high-frequency magnetic field environment, the expression of the effective value U of the induced voltage in the single magnetic field detection coil (4) is as follows:
U＝ω·Φ＝ω·B av ·S·N t (1)
wherein ω represents the operating angular frequency of the system, Φ represents the total magnetic flux through the magnetic field sensing coil (4), B av Represents the average magnetic induction intensity passing through the magnetic field detection coil (4), S represents the area of the detection coil, N t Indicating the number of turns of the detection coil;
thus, the average magnetic induction through the magnetic field detection coil (4) is calculated by the following formula:
by the above formula, the voltage signal measured in the magnetic field detection coil (4) is converted into a magnetic field signal.
3. A control method of a visual prosthesis wireless power supply system with self-shielding function according to claim 1, characterized in that the external power transmitting end device (1) comprises a class E amplifier, a compensation circuit and a transmitting coil, the output end of the class E amplifier is connected with the compensation circuit, the output end of the compensation circuit is connected with the transmitting coil, wherein,
the class E amplifier is used for outputting high-frequency voltage of MHz level;
the compensation circuit is used for compensating the self inductance of the transmitting coil and eliminating reactive power in the system;
the transmitting coil is used for exciting a high-frequency magnetic field in space after high-frequency current is introduced.
4. The control method of a visual prosthesis wireless power supply system with a self-shielding function according to claim 1, wherein the external leakage magnetic field regulating device (2) comprises an active shielding coil (5), a magnetic field detection coil (4), a signal conversion device, a DSP controller, a unit control circuit and a shielding coil compensation circuit, wherein the magnetic field detection coil (4), the signal conversion device, the DSP controller, the unit control circuit, the shielding coil compensation circuit and the active shielding coil (5) are sequentially connected,
the magnetic field detection coil (4) is used for detecting a voltage signal sent by the transmitting coil;
the signal conversion device is used for converting the detected voltage signal into a magnetic field signal;
the DSP controller and the unit control circuit are used for controlling the conduction of the active shielding coil (5) according to the magnetic field signal;
and the active shielding coil (5) is used for being controlled to be conducted by the unit control circuit to generate a counteracting magnetic field.
5. The control method of a wireless power supply system for a visual prosthesis having a self-shielding function according to claim 4, further comprising an eye mask, wherein the magnetic field detection coil (4) and the active shielding coil (5) are integrated in the eye mask.
6. The control method of a visual prosthesis wireless power supply system with a self-shielding function according to claim 5, wherein a plurality of magnetic field detection coils (4) are arranged on one side of the eye shield close to a human body, the magnetic field detection coils are rectangular or circular, the sizes of the coils in the plurality of coils are the same, and the output end of each magnetic field detection coil (4) is connected with the signal conversion device positioned outside the eye shield; the active shielding coils (5) are arranged on the outer sides of the eyeshields, and the active shielding coils (5) are in one-to-one correspondence with the installation positions of the magnetic field detection coils (4); each active shielding coil (5) is connected with the compensation circuit respectively.
7. The control method of a visual prosthesis wireless power supply system with a self-shielding function according to claim 1, wherein the implantable power receiving end device (3) is implanted in a human body through surgery and comprises a receiving coil, a compensating circuit, a rectifying circuit, an implantable battery, a microelectrode stimulation controller and a stimulation electrode, wherein the receiving coil, the compensating circuit, the rectifying circuit, the implantable battery, the microelectrode stimulation controller and the stimulation electrode are sequentially connected,
the receiving coil is used for inducing high-frequency voltage in the high-frequency magnetic field;
the compensation circuit is used for compensating the self inductance of the receiving coil and reducing the inductance of the receiving coil;
the rectification circuit is used for converting alternating current energy into direct current energy;
the implantable battery is used for storing electric energy;
the microelectrode stimulation controller is used for generating a control signal to control the stimulation electrode;
the stimulating electrode is used for repairing the visual nerve.
8. The method of claim 7, wherein the compensation circuit is a series compensation circuit.
9. The method for controlling a wireless power supply system for a visual prosthesis with a self-shielding function according to claim 8, wherein the rectifying circuit is an uncontrolled rectifying circuit.
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| US5935155A (en) * | 1998-03-13 | 1999-08-10 | John Hopkins University, School Of Medicine | Visual prosthesis and method of using same |
| KR20120082768A (en) * | 2011-01-14 | 2012-07-24 | 한국과학기술원 | Loop type emf shielding apparatus comprising automatic controller |
| CN103272329A (en) * | 2013-05-06 | 2013-09-04 | 上海交通大学 | Artificial vision prosthetic device with wireless energy transmission function |
| EP3700316A1 (en) * | 2017-10-19 | 2020-08-26 | Nio Nextev Limited | Dynamic active flux leakage shielding device and method |
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| CA2807733A1 (en) * | 2010-09-26 | 2012-03-29 | Access Business Group International Llc | Selectively controllable electromagnetic shielding |
| US9118357B2 (en) * | 2011-02-17 | 2015-08-25 | Qualcomm Incorporated | Systems and methods for controlling output power of a wireless power transmitter |
| US9819228B2 (en) * | 2013-03-01 | 2017-11-14 | Qualcomm Incorporated | Active and adaptive field cancellation for wireless power systems |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5935155A (en) * | 1998-03-13 | 1999-08-10 | John Hopkins University, School Of Medicine | Visual prosthesis and method of using same |
| KR20120082768A (en) * | 2011-01-14 | 2012-07-24 | 한국과학기술원 | Loop type emf shielding apparatus comprising automatic controller |
| CN103272329A (en) * | 2013-05-06 | 2013-09-04 | 上海交通大学 | Artificial vision prosthetic device with wireless energy transmission function |
| EP3700316A1 (en) * | 2017-10-19 | 2020-08-26 | Nio Nextev Limited | Dynamic active flux leakage shielding device and method |
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