CN112600316B - Low-electromagnetic-radiation vision prosthesis wireless charging system and control method thereof - Google Patents

Low-electromagnetic-radiation vision prosthesis wireless charging system and control method thereof Download PDF

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CN112600316B
CN112600316B CN202011504388.0A CN202011504388A CN112600316B CN 112600316 B CN112600316 B CN 112600316B CN 202011504388 A CN202011504388 A CN 202011504388A CN 112600316 B CN112600316 B CN 112600316B
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transmitting
voltage
coil
transmitting end
wireless charging
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CN112600316A (en
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李笑华
帅天姣
尹璐
王睿
石义鹭
张旭春
石金羽
郭巍
郭东青
徐艳敏
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Mudanjiang Medical University
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Mudanjiang Medical University
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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
    • 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
    • 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
    • A61N1/3605—Implantable neurostimulators for stimulating central or peripheral nerve system
    • A61N1/3606—Implantable neurostimulators for stimulating central or peripheral nerve system adapted for a particular treatment
    • 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
    • A61N1/3605—Implantable neurostimulators for stimulating central or peripheral nerve system
    • A61N1/36125—Details of circuitry or electric components
    • 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
    • A61N1/3605—Implantable neurostimulators for stimulating central or peripheral nerve system
    • A61N1/36128—Control systems

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Public Health (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Veterinary Medicine (AREA)
  • General Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Radiology & Medical Imaging (AREA)
  • Animal Behavior & Ethology (AREA)
  • Neurosurgery (AREA)
  • Neurology (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Ophthalmology & Optometry (AREA)
  • Prostheses (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Electrotherapy Devices (AREA)

Abstract

The invention relates to a low-electromagnetic-radiation vision prosthesis wireless charging system and a control method thereof. The invention relates to the technical field of biomedical engineering, in particular to a low-electromagnetic-radiation visual prosthesis wireless charging system which comprises an external transmitting end nickel-iron alloy spectacle frame, a lens type PCB transmitting end, a nickel-iron alloy spectacle leg, a receiving coil, a voltage sensor, a Bluetooth receiving module, a Bluetooth transmitting module, a DSP controller, a change-over switch, an E-type amplifier, a direct-current power supply, a compensation capacitor, an uncontrolled rectifying circuit and a microelectrode controller. The invention can provide stable energy transmission for the in-vivo implanted visual prosthesis in a wireless mode, so that a patient gets rid of the constraint of an in-vivo storage battery, the battery replacement operation is not required to be carried out periodically, and the operation risk and the operation cost which are born by the patient are reduced.

Description

Low-electromagnetic-radiation vision prosthesis wireless charging system and control method thereof
Technical Field
The invention relates to the technical field of biomedical engineering, in particular to a low-electromagnetic-radiation visual prosthesis wireless charging system and a control method thereof.
Background
The implanted medical device-vision prosthesis can help the vision-impaired people, especially the patients suffering from retinitis pigmentosa and senile macular degeneration to recover vision. As an artificial organ, the visual prosthesis can bypass the damaged part in the visual pathway of the human body, and external light sensation information is directly transmitted to the brain of the human body by functionally and electrically stimulating visual nerve tissues, so that the purpose of restoring vision is achieved, and a new road is expected to be opened for the blindman patient to know again.
The visual prosthesis is an artificial organ implanted in the body, and internal components such as a data transceiver unit, an electrode stimulation controller, a stimulation electrode and the like all need stable energy supply to maintain normal operation. At present, the visual prosthesis usually uses an implanted accumulator as an internal power supply. Limited by the low energy density and limited service life of existing batteries, blind patients need to replace the implanted batteries by performing a secondary operation periodically after a period of time for implanting the visual prosthesis in order to maintain the proper operation of the visual prosthesis. Frequent operations not only increase the pain that blind patients need to bear, but also require a great deal of operation cost, which greatly limits the popularization and application of visual prostheses. On the other hand, the implantable storage battery may have faults such as damage and leakage in the use process, and the leakage of the battery with corrosiveness can cause serious damage to human muscle and nerve tissues and even endanger life.
In order to solve the above problems, wireless power transmission technology applied to visual prostheses is receiving attention. The technology takes a high-frequency electromagnetic field as an energy transmission medium, and transmits energy to an implanted receiving end through the skin in a wireless mode through an external transmitting end device, so that stable energy supply is provided for the implanted visual prosthesis, and the visual prosthesis is free from constraint of an implanted storage battery.
At present, scholars at home and abroad have conducted relevant research around wireless power supply systems applied to visual prostheses. Patent publication No. CN 102258409A proposes a wireless energy and data transmission system for visual prostheses that can simultaneously transmit energy and an external light sensation signal to an implanted visual prosthesis. Patent publication No. CN 1961850a proposes a visual prosthesis wireless power supply device based on a solar cell panel as a power supply device. Patent publication No. CN102813999A proposes a visual prosthesis wireless transmission system with adaptive power adjustment function, which can automatically adjust the input power of a transmitting terminal device by predicting the energy required by an implanted stimulation electrode. The document [ research on wireless energy and data transmission devices in visual prostheses [ D ], Shanghai university of transportation, 2011 ] designs a wireless data and energy transmission charging device applied to visual prostheses. However, the wireless charging device applied to the visual prosthesis neglects the electromagnetic safety problem of the human body and has potential health risks. In order to ensure that enough power is transmitted, the sizes of the transmitting coils in the device are all larger than the size of the receiving coil by more than several times, so that the face of a human body is almost completely exposed to strong electromagnetic radiation generated by the transmitting coils in the normal working process of the system. Thus, the electromagnetic radiation generated by the transmitting coil produces thermal effects in the human tissue, which over time can damage the more sensitive organs and tissues within the human body.
Aiming at the defects in the existing research, the invention provides a visual prosthesis wireless charging device with low electromagnetic radiation and a charging control method thereof. The device provides stable energy transmission for the in vivo implanted visual prosthesis in a wireless mode through the in vitro transmitting end device, so that a patient gets rid of the constraint of an in vivo storage battery, and a battery replacement operation is not required to be performed periodically. Meanwhile, compared with the existing visual prosthesis wireless charging device, the device disclosed by the invention adopts the array type transmitting coils, and can effectively detect the position of the transmitting coil with the highest coupling degree with the receiving coil through a voltage injection method, so that the transmitting coils at the corresponding positions are accurately conducted, the main focusing field is realized, the purposes of reducing the electromagnetic radiation generated by a system on a human body and implanted electronic equipment and improving the system efficiency are achieved. In addition, the wireless charging device is also suitable for receiving coils with any shapes and any implantation positions, and has the advantages of high flexibility and wide applicability.
Disclosure of Invention
In order to solve the problems of poor electromagnetic safety, low transmission efficiency and the like in the conventional wireless power supply system applied to an implanted visual prosthesis, the invention provides the following technical scheme:
a visual prosthesis wireless charging system with low electromagnetic radiation comprises a nickel-iron alloy spectacle frame at an external transmitting end, a lens type PCB transmitting end, a nickel-iron alloy spectacle leg, a receiving coil, a voltage sensor, a Bluetooth receiving module, a Bluetooth transmitting module, a DSP controller, a change-over switch, an E-class amplifier, a direct-current power supply, a compensation capacitor, an uncontrolled rectifier circuit and a microelectrode controller;
the direct-current power supply is connected with an E-class amplifier, the E-class amplifier is connected with a change-over switch, the change-over switch is connected with a lens type PCB transmitting end, the lens type PCB transmitting end is installed in a nickel-iron alloy mirror frame of the external transmitting end, the DSP controller is connected with a control change-over switch, and the DSP controller is connected with a Bluetooth receiving module;
the lens formula PCB transmitting terminal passes through high frequency magnetic field coupling with receiving coil, receiving coil connects bluetooth transmitting module and voltage sensor, bluetooth transmitting module connects compensation electric capacity, the uncontrolled rectifier circuit is connected to compensation electric capacity, the no controlled rectifier circuit connects the microelectrode controller, the optic nerve false body is connected to the microelectrode controller, ferronickel mirror foot is connected to external transmitting terminal ferronickel mirror holder side.
Preferably, the lens type PCB transmitting terminal comprises an array transmitting coil and a transmitting terminal patch capacitor, the array transmitting coil is integrated on one surface of the lens type PCB transmitting terminal, an output end of the array transmitting coil is connected in series with the transmitting terminal patch capacitor, and the transmitting terminal patch capacitor is connected with the change-over switch.
Preferably, the array-type transmitting coil comprises N × M transmitting coils, wherein both N and M are greater than or equal to 2, the transmitting coils have the same size and are spatially and symmetrically distributed on the transmitting end surface of the lens-type PCB, and the transmitting coils are rectangular or circular coils.
Preferably, the lens type PCB emission end is a double-sided plate structure.
Preferably, the nickel-iron alloy spectacle frame at the external transmitting end comprises a nose support, a hinge and a lens shell, wherein the nose support is arranged on the inner side of the lens shell; the hinge is arranged on two sides of the lens shell and used for connecting the nickel-iron alloy glasses legs with the lens shell.
A wireless charging control method for a visual prosthesis with low electromagnetic radiation comprises the following steps:
step 1: the class-E amplifier is powered by a direct-current power supply, outputs high-frequency voltage and initially supplies power to the direct-current power supply;
step 2: sending a control signal to a selector switch through a DSP controller, and controlling a transmitting coil in a transmitting end of the lens type PCB to be connected with an E-class amplifier in series;
and step 3: the voltage sensor is used for detecting the effective value of the open-circuit voltage of the receiving coil, the Bluetooth sending module is used for sending the effective value of the open-circuit voltage to the Bluetooth receiving module, and the Bluetooth receiving module is used for transmitting the effective value of the open-circuit voltage to the DSP controller;
and 4, step 4: the DSP controller sequences the transmitting coils according to the amplitude of the detected open circuit voltage effective value and the sequence of the voltage amplitudes from large to small;
and 5: the DSP controller controls the switch according to the sequence and passes through Coil1To CoilkThe order of (c) indicates the transmitting Coil, and when k is 1, only the code Coil is turned on1The transmitting coil of (1), detecting an induced voltage in the receiving coil by a voltage sensor;
step 6: when the receiving coil is conducted, acquiring induction voltage information of the receiving coil; the induction voltage information is transmitted to the Bluetooth receiving module through the Bluetooth sending module, and then the induction voltage information is transmitted to the DSP controller through the Bluetooth receiving module;
and 7: judging whether the induction voltage is greater than or equal to the voltage required by charging through the DSP controller until the power supply of the class E amplifier is cut off;
and 8: the power supply voltage Udd of the direct current power supply meets the following conditions: u shapedd new＝Udd+ 1V; and (5) repeating the step (5) to the step (8) until the induction voltage is more than or equal to the voltage required by charging, supplying power to the microelectrode controller after the induction voltage is rectified by the compensation capacitor and the uncontrolled rectifying circuit, and stimulating the optic nerve prosthesis to generate a stimulation signal by the microelectrode controller until the SOC of the microelectrode controller is 1.
Preferably, only a single transmitting coil is turned on at the same time in the lens type PCB transmitting end in step 2, after the single transmitting coil is turned on for 3s, the switch connected with the transmitting coil is turned off, and then the DSP controls the next transmitting coil to be connected with the class E amplifier through the change-over switch until each transmitting coil unit in the lens type PCB transmitting end is turned on once and then stops.
Preferably, when the switch is turned on, each transmitting coil is connected in parallel with the output terminal of the class E amplifier, and the transmitting coils that are turned on have the same input voltage.
Preferably, when the SOC of the dc power supply is 1, the power supply of the class E amplifier is cut off.
Preferably, the step 7 specifically includes: the DSP controller judges whether the induction voltage is greater than or equal to the voltage required for charging, and when the induction voltage is greater than or equal to the voltage required for charging, wireless charging is carried out; and when the induced voltage is smaller than the voltage required by charging, making k equal to k +1, and repeating the steps 5 to 7 until k is larger than n.
The invention has the following beneficial effects:
the invention can provide stable energy transmission for the in-vivo implanted visual prosthesis in a wireless mode, so that a patient gets rid of the constraint of an in-vivo storage battery, the battery replacement operation is not required to be carried out periodically, and the operation risk and the operation cost which are born by the patient are reduced. Compared with the traditional visual prosthesis adopting a wired charging mode, the visual prosthesis can also avoid the problems of biological tissue infection, rejection reaction and the like caused by a wire interface. Meanwhile, compared with the existing visual prosthesis wireless charging device, the wireless charging device disclosed by the invention adopts an integrated design, integrates the transmitting end magnetic core, the transmitting coil and the transmitting end resonant capacitor in the external glasses, and has the advantages of small volume, convenience in wearing and flexibility in charging. Furthermore, the device of the invention adopts the array type transmitting coil, each coil is controlled independently, and the charging control method of the invention is matched, so that the position of the transmitting coil with the highest coupling degree with the receiving coil can be effectively detected, the transmitting coil at the corresponding position is accurately conducted, the generation of an ineffective leakage magnetic field is avoided, and the purposes of reducing the electromagnetic radiation of a system to a human body and implanted electronic equipment and improving the system efficiency are achieved. In addition, the wireless charging device is also suitable for receiving coils with any shapes and any implantation positions, and has the advantage of wide applicability.
Drawings
FIG. 1 is a system block diagram of a low electromagnetic radiation wireless charging system for a visual prosthesis;
FIG. 2 is a schematic structural diagram of a visual prosthesis wireless charging device;
FIG. 3 is a schematic side view of the assembly of the visual prosthesis wireless charging device;
FIG. 4 is a schematic structural diagram of a lens-type PCB emitting end;
FIG. 5 is a front view of the lens PCB emitter;
fig. 6 is a flowchart of a charging control method of a visual prosthesis wireless power supply system.
Detailed Description
The present invention will be described in detail with reference to specific examples.
The first embodiment is as follows:
referring to fig. 1 to 6, the present invention provides a visual prosthesis wireless charging system with low electromagnetic radiation and a control method thereof:
a visual prosthesis wireless charging system with low electromagnetic radiation comprises an external transmitting end nickel-iron alloy spectacle frame 1, a lens type PCB transmitting end 2, a nickel-iron alloy spectacle leg 3, a receiving coil 4, a voltage sensor 5, a Bluetooth receiving module, a Bluetooth transmitting module, a DSP controller, a change-over switch, an E-class amplifier, a direct-current power supply, a compensation capacitor, an uncontrolled rectifying circuit and a microelectrode controller;
the direct current power supply is connected with an E-type amplifier, the E-type amplifier is connected with a change-over switch, the change-over switch is connected with a lens type PCB transmitting end 2, the lens type PCB transmitting end 2 is installed in a nickel-iron alloy mirror frame 1 of an external transmitting end, the DSP controller is connected with a control change-over switch, and the DSP controller is connected with a Bluetooth receiving module;
the lens formula PCB transmitting terminal 2 passes through high frequency magnetic field coupling with receiving coil 4, bluetooth transmitting module and voltage sensor 5 are connected to receiving coil 4, bluetooth transmitting module connects compensation electric capacity, the uncontrolled rectifier circuit is connected to compensation electric capacity, the uncontrolled rectifier circuit connects the microelectrode controller, optic nerve prosthesis is connected to the microelectrode controller, ferronickel mirror foot is connected to external transmitting terminal ferronickel mirror holder side.
The lens type PCB transmitting end comprises an array type transmitting coil 21 and a transmitting end patch capacitor 22, wherein the array type transmitting coil 21 is integrated on one surface of the lens type PCB transmitting end, the output end of the array type transmitting coil 21 is connected with the transmitting end patch capacitor 22 in series, and the transmitting end patch capacitor is connected with a change-over switch.
The array type transmitting coil comprises N multiplied by M transmitting coils, wherein N and M are both more than or equal to 2, the transmitting coils are the same in size and are symmetrically distributed on the transmitting end face of the lens type PCB in space, and the transmitting coils are rectangular or circular coils.
The lens type PCB transmitting end is of a double-sided plate structure.
The nickel-iron alloy spectacle frame at the external transmitting end comprises a nose support, a hinge and a lens shell, wherein the nose support is arranged on the inner side of the lens shell; the hinge is arranged on two sides of the lens shell and used for connecting the nickel-iron alloy glasses legs with the lens shell.
A wireless charging control method for a visual prosthesis with low electromagnetic radiation comprises the following steps:
step 1: the class-E amplifier is powered by a direct-current power supply, outputs high-frequency voltage and initially supplies power to the direct-current power supply;
step 2: sending a control signal to a selector switch through a DSP controller, and controlling a transmitting coil in a transmitting end of the lens type PCB to be connected with an E-class amplifier in series;
and 2, only one transmitting coil is conducted in the lens type PCB transmitting end at the same time, after the single transmitting coil is conducted for 3s, a switch connected with the transmitting coil is closed, and then the next transmitting coil is controlled by the DSP through a change-over switch to be connected with the class-E amplifier until each transmitting coil unit in the lens type PCB transmitting end is conducted once and then the transmission is stopped.
And step 3: the voltage sensor is used for detecting the effective value of the open-circuit voltage of the receiving coil, the Bluetooth sending module is used for sending the effective value of the open-circuit voltage to the Bluetooth receiving module, and the Bluetooth receiving module is used for transmitting the effective value of the open-circuit voltage to the DSP controller;
and 4, step 4: the DSP controller sequences the transmitting coils according to the amplitude of the detected open circuit voltage effective value and the sequence of the voltage amplitudes from large to small;
and 5: the DSP controller controls the switch according to the sequence and passes through Coil1To CoilkThe order of (c) indicates the transmitting Coil, and when k is 1, only the code Coil is turned on1The transmitting coil of (1), detecting an induced voltage in the receiving coil by a voltage sensor;
step 6: when the receiving coil is conducted, acquiring induction voltage information of the receiving coil; the induction voltage information is transmitted to the Bluetooth receiving module through the Bluetooth sending module, and then the induction voltage information is transmitted to the DSP controller through the Bluetooth receiving module;
and 7: judging whether the induction voltage is greater than or equal to the voltage required by charging through the DSP controller until the power supply of the class E amplifier is cut off;
the step 7 specifically comprises the following steps: the DSP controller judges whether the induction voltage is greater than or equal to the voltage required for charging, and when the induction voltage is greater than or equal to the voltage required for charging, wireless charging is carried out; and when the induced voltage is smaller than the voltage required by charging, making k equal to k +1, and repeating the steps 5 to 7 until k is larger than n.
And 8: the power supply voltage Udd of the direct current power supply meets the following conditions: u shapedd new＝Udd+ 1V; and (5) repeating the step (5) to the step (8) until the induction voltage is more than or equal to the voltage required by charging, supplying power to the microelectrode controller after the induction voltage is rectified by the compensation capacitor and the uncontrolled rectifying circuit, and stimulating the optic nerve prosthesis to generate a stimulation signal by the microelectrode controller until the SOC of the microelectrode controller is 1.
When the switch is switched on, each transmitting coil is connected in parallel with the output end of the class E amplifier, and the transmitting coils which are switched on have the same input voltage.
And when the SOC of the direct current power supply is 1, cutting off the power supply of the class E amplifier.
The second embodiment is as follows:
the invention aims to solve the problems of poor electromagnetic safety, low transmission efficiency and the like in the conventional wireless power supply system applied to an implanted visual prosthesis, and provides a visual prosthesis wireless charging device with low electromagnetic radiation and a charging control method thereof. The following describes an embodiment of the present invention with reference to fig. 1 to 6.
The system block diagram of the low electromagnetic radiation wireless charging system applied to the visual prosthesis is shown in the attached figure 1; on the circuit structure, the class-E amplifier is supplied with power through a direct current power supply in vitro, and then outputs high-frequency voltage with fixed frequency at MHz level; then, the conduction of each array type transmitting coil in the transmitting end of the lens type PCB is controlled through a selector switch, and a class-E amplifier generates high-frequency alternating current in the conducted transmitting coil so as to excite a high-frequency magnetic field in space to supply power to the implanted receiving coil;
the receiving coil is implanted in the human body and is rectangular or circular; after the high-frequency magnetic field excited by the transmitting coil induces high-frequency output voltage in the implanted receiving coil, the high-frequency output voltage supplies power to the implanted microelectrode controller after passing through the receiving end compensation capacitor and the uncontrolled rectifying current, so that the micro-stimulation electrode is controlled to generate stimulation signals for the visual nerve; the receiving end compensation capacitor is used for compensating the self-inductance of the receiving coil, eliminating the reactive power in the system and improving the power factor of the system;
the implantable voltage sensor is arranged in a human body and used for detecting the output voltage of the receiving coil, then sending the detected output voltage signal to the external Bluetooth receiving module through the internal Bluetooth sending module and further transmitting the output voltage signal to the external DSP controller;
the external DSP controller controls the on-off of the selector switch by comparing the induced voltage with the preset voltage required by charging; the charge control method can effectively detect the transmitting coil position with the highest coupling degree with the receiving coil, thereby accurately conducting the transmitting coil at the corresponding position through the DSP controller, avoiding the generation of an invalid leakage magnetic field, and achieving the purposes of reducing the electromagnetic radiation of the system to the human body and the implanted electronic equipment and improving the system efficiency;
the low-electromagnetic-radiation vision prosthesis wireless charging device is shown in the attached figures 2 and 3, the appearance of the device is of a glasses structure and is composed of three parts, wherein the first part is a nickel-iron alloy mirror frame at an external transmitting end, the second part is a lens type PCB transmitting end, and the third part is a nickel-iron alloy mirror foot; the function of the device is to generate a high-frequency alternating magnetic field in space and transmit energy to an electric energy receiving end device;
the spectacle frame at the external transmitting end consists of a nose support, a hinge and a lens shell, and all materials are made of nickel-iron alloy; the lens shell is in a lens shape, the size of the lens shell is slightly larger than that of the lens PCB transmitting end, and the lens PCB transmitting end can be embedded in the lens shell; the nose pads are arranged on the inner sides of the two lens shells and play a role in connecting the two lens shells and fixing the appearance; the hinges are arranged on two sides of the lens shell and are used for connecting the nickel-iron alloy lens legs with the lens shell; the ferronickel frame at the external transmitting end plays a role in supporting on one hand, and plays a role in guiding the direction of magnetic lines generated by the transmitting coil on the other hand, and shapes a main magnetic field generated by the transmitting coil, so that the mutual inductance and the coupling coefficient between the transmitting coil and the implanted receiving coil are enhanced, and a leakage magnetic field generated by the transmitting coil is shielded; the nickel-iron alloy is adopted for the purposes that on one hand, the material has higher magnetic conductivity and can effectively shape a magnetic field, and on the other hand, the material has smaller loss in a high-frequency magnetic field and can effectively improve the transmission efficiency of a wireless power supply system;
the lens type PCB transmitting terminal adopts a printed circuit board process as shown in attached figures 4 and 5, is of a double-sided board structure, consists of two parts of an array type transmitting coil and a transmitting terminal patch capacitor, and is embedded in a ferronickel alloy spectacle frame at the external transmitting terminal; the transmitting coil is integrated on one surface of the lens type PCB transmitting end through a printed circuit board process, and the output end of the transmitting coil is connected with the transmitting end patch capacitor in series and then connected with an external selector switch; the number of the transmitting terminal patch capacitors is the same as that of the array transmitting coils, the transmitting terminal patch capacitors are welded on the other surface of the transmitting terminal of the lens type PCB, and each transmitting terminal patch capacitor is connected with a single transmitting coil in series on a circuit and used for compensating the self inductance of the transmitting coil and eliminating reactive power in a system;
furthermore, each lens type PCB is integrated with N multiplied by M transmitting coils, wherein N and M are both more than or equal to 2; the transmitting coils are completely the same in size and are symmetrically distributed on the lens type PCB in space; the transmitting coil is a rectangular or circular coil; the number of turns of the transmitting coil is Np and is determined by the output voltage and the transmission power required by the system;
furthermore, the lens type PCB transmitting end is connected with an external change-over switch and an E-type amplifier on a circuit; the conduction of each array type transmitting coil in the transmitting end of the lens type PCB is controlled by an external selector switch;
the invention also provides a charging control method of the low-electromagnetic-radiation vision prosthesis wireless charging device, which comprises the following 6 basic steps:
step 1: initializing a system, enabling k to be 1, supplying power to an E-class amplifier by an external direct-current power supply, and outputting high-frequency voltage by the E-class amplifier; the initial power supply voltage Udd of the external direct current power supply is 5V;
step 2: the DSP controller sends a control signal to the selector switch, so that a transmitting coil in a transmitting end of the lens type PCB is sequentially connected with the class-E power amplifier in series, and a high-frequency magnetic field is excited to supply power to the implanted receiving coil;
and step 3: during the process of conducting the single transmitting coil unit, effective values of the open-circuit voltage of the receiving coil at the moment are detected by the implanted voltage sensor, which are respectively recorded as U1., Ui., Un, wherein i is 1 and 2 … n; u1., Ui. Un is sent to an external Bluetooth receiving module through an internal Bluetooth sending module and is transmitted to a DSP controller;
and 4, step 4: the DSP controller sorts the transmitting coils according to the amplitude of the detected induction voltage U1., Ui., Un and the sequence of the amplitude of the induction voltage from large to small, and the transmitting coils are marked as Coil1, Coilj, Coiln, j being 1 and 2 … n, wherein Coil1 represents the transmitting Coil corresponding to the maximum induction voltage, and Coiln represents the transmitting Coil corresponding to the minimum induction voltage; a
And 5: the DSP controller controls the switch to conduct a transmitting Coil with the number of Coil1.. Coilk (when k is 1, only the transmitting Coil with the number of Coil1 is conducted), and then an implanted voltage sensor detects the induced voltage Uout in the receiving Coil;
step 6: detecting induction voltage information of a receiving coil when the transmitting coil1. Coilk is simultaneously conducted, and recording the induction voltage information as Uout; the voltage information Uout is transmitted to an external Bluetooth receiving module through a Bluetooth sending module, and then the induced voltage information is transmitted to a DSP controller;
and 7: the DSP judges whether the induction voltage Uout is larger than or equal to the required charging voltage Uned, if the Uout is larger than or equal to the required charging voltage Uned, the current state is kept for wireless charging, and the power supply of the class E amplifier is cut off until the SOC of the battery is 1; if Uout < unneed, let k equal to k +1, repeat steps 5 to 7 until k > n;
and 8: the power supply voltage Udd of the external direct current power supply meets the following conditions: udd + 1V; repeating the steps 5 to 8 until Uout is more than or equal to Uneed, and keeping the state for wireless charging until the SOC of the battery is 1;
further, only a single transmitting coil is conducted at the same time in the lens type PCB transmitting end in the step 2; after a single transmitting coil is conducted for 3s, a switch connected with the coil is closed, and then the DSP controls the next transmitting coil to be connected with the class E amplifier through a change-over switch until each transmitting coil unit in the lens type PCB transmitting end is conducted once and then is stopped;
further, in step 6, when the switch is turned on, each transmitting coil1.. Coilk is connected in parallel with the output end of the class E amplifier, and the turned-on transmitting coils have the same input voltage;
the above description is only a preferred embodiment of the wireless charging system for the visual prosthesis with low electromagnetic radiation and the control method thereof, and the protection scope of the wireless charging system for the visual prosthesis with low electromagnetic radiation and the control method thereof is not limited to the above embodiments, and all technical solutions belonging to the idea belong to the protection scope of the present invention. It should be noted that modifications and variations which do not depart from the gist of the invention will be those skilled in the art to which the invention pertains and which are intended to be within the scope of the invention.

Claims (7)

1. A low-electromagnetic-radiation visual prosthesis wireless charging control method is based on a low-electromagnetic-radiation visual prosthesis wireless charging system, and the system comprises an external transmitting end nickel-iron alloy spectacle frame, a lens type PCB transmitting end, a nickel-iron alloy spectacle leg, a receiving coil, a voltage sensor, a Bluetooth receiving module, a Bluetooth transmitting module, a DSP controller, a change-over switch, an E-type amplifier, a direct-current power supply, a compensation capacitor, an uncontrolled rectifier circuit and a microelectrode controller;
the direct-current power supply is connected with an E-class amplifier, the E-class amplifier is connected with a change-over switch, the change-over switch is connected with a lens type PCB transmitting end, the lens type PCB transmitting end is installed in a nickel-iron alloy mirror frame of the external transmitting end, the DSP controller is connected with a control change-over switch, and the DSP controller is connected with a Bluetooth receiving module;
the lens type PCB transmitting end is coupled with a receiving coil in a high-frequency magnetic field, the receiving coil is connected with a Bluetooth transmitting module and a voltage sensor, the Bluetooth transmitting module is connected with a compensation capacitor, the compensation capacitor is connected with an uncontrolled rectifying circuit, the uncontrolled rectifying circuit is connected with a microelectrode controller, the microelectrode controller is connected with an optic nerve prosthesis, and the side surface of a nickel-iron alloy spectacle frame at the external transmitting end is connected with a nickel-iron alloy spectacle leg;
the lens type PCB transmitting end comprises an array type transmitting coil and a transmitting end patch capacitor, the array type transmitting coil is integrated on one surface of the lens type PCB transmitting end, the output end of the array type transmitting coil is connected with the transmitting end patch capacitor in series, and the transmitting end patch capacitor is connected with the change-over switch;
the array type transmitting coil comprises N multiplied by M transmitting coils, wherein N and M are both more than or equal to 2, the transmitting coils are the same in size and are symmetrically distributed on the transmitting end face of the lens type PCB in space, and the transmitting coils are rectangular or circular coils and are characterized in that: the method comprises the following steps:
step 1: the class-E amplifier is powered by a direct-current power supply, outputs high-frequency voltage and initially supplies power to the direct-current power supply;
step 2: sending a control signal to a selector switch through a DSP controller, and controlling a transmitting coil in a transmitting end of the lens type PCB to be connected with an E-class amplifier in series;
and step 3: the voltage sensor is used for detecting the effective value of the open-circuit voltage of the receiving coil, the Bluetooth sending module is used for sending the effective value of the open-circuit voltage to the Bluetooth receiving module, and the Bluetooth receiving module is used for transmitting the effective value of the open-circuit voltage to the DSP controller;
and 4, step 4: the DSP controller sequences the transmitting coils according to the amplitude of the detected open circuit voltage effective value and the sequence of the voltage amplitudes from large to small;
and 5: the DSP controller controls the switch according to the sequence and passes through Coil1To CoilkThe order of (c) indicates the transmitting Coil, and when k is 1, only the code Coil is turned on1The transmitting coil of (1), detecting an induced voltage in the receiving coil by a voltage sensor;
step 6: when the receiving coil is conducted, acquiring induction voltage information of the receiving coil; the induction voltage information is transmitted to the Bluetooth receiving module through the Bluetooth sending module, and then the induction voltage information is transmitted to the DSP controller through the Bluetooth receiving module;
and 7: judging whether the induction voltage is greater than or equal to the voltage required by charging through the DSP controller until the power supply of the class E amplifier is cut off;
and 8: the power supply voltage Udd of the direct current power supply meets the following conditions: u shapedd new＝Udd+ 1V; and (5) repeating the step (5) to the step (8) until the induction voltage is more than or equal to the voltage required by charging, supplying power to the microelectrode controller after the induction voltage is rectified by the compensation capacitor and the uncontrolled rectifying circuit, and stimulating the optic nerve prosthesis to generate a stimulation signal by the microelectrode controller until the SOC of the microelectrode controller is 1.
2. The wireless charging control method for the visual prosthesis with low electromagnetic radiation according to claim 1, characterized in that: the lens type PCB transmitting end is of a double-sided plate structure.
3. The wireless charging control method for the visual prosthesis with low electromagnetic radiation according to claim 1, characterized in that: the nickel-iron alloy spectacle frame at the external transmitting end comprises a nose support, a hinge and a lens shell, wherein the nose support is arranged on the inner side of the lens shell; the hinge is arranged on two sides of the lens shell and used for connecting the nickel-iron alloy glasses legs with the lens shell.
4. The wireless charging control method for the visual prosthesis with low electromagnetic radiation according to claim 1, characterized in that: and 2, only one transmitting coil is conducted in the lens type PCB transmitting end at the same time, after the single transmitting coil is conducted for 3s, a switch connected with the transmitting coil is closed, and then the next transmitting coil is controlled by the DSP through a change-over switch to be connected with the class-E amplifier until each transmitting coil unit in the lens type PCB transmitting end is conducted once and then the transmission is stopped.
5. The wireless charging control method for the visual prosthesis with low electromagnetic radiation according to claim 1, characterized in that:
when the switch is switched on, each transmitting coil is connected in parallel with the output end of the class E amplifier, and the transmitting coils which are switched on have the same input voltage.
6. The wireless charging control method for the visual prosthesis with low electromagnetic radiation according to claim 1, characterized in that: and when the SOC of the direct current power supply is 1, cutting off the power supply of the class E amplifier.
7. The wireless charging control method for the visual prosthesis with low electromagnetic radiation according to claim 1, characterized in that: the step 7 specifically comprises the following steps: the DSP controller judges whether the induction voltage is greater than or equal to the voltage required for charging, and when the induction voltage is greater than or equal to the voltage required for charging, wireless charging is carried out; and when the induced voltage is smaller than the voltage required by charging, making k equal to k +1, and repeating the steps 5 to 7 until k is larger than n.
CN202011504388.0A 2020-12-17 2020-12-17 Low-electromagnetic-radiation vision prosthesis wireless charging system and control method thereof Active CN112600316B (en)

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