In-vitro charger and temperature control method thereof

Abstract

The invention provides an in-vitro charger and a temperature control method thereof, and is applied to the field of medical equipment charging. The method comprises the following steps: acquiring the environment temperature T0 of the in-vitro charger; a charging transmitting coil in the in-vitro charger is used for wirelessly charging the implantable medical device at the maximum power Pmax; calculating a transmitting power control target Pref according to the environment temperature T0 and the temperature threshold Tref; in a wireless charging process, collecting a current I of the charging transmitting coil; calculating the heating power P of the charging transmitting coil according to the current I and the internal resistance R; charging parameters are adjusted according to the difference between the heating power P and the transmitting power control target Pref so as to limit the temperature rise of the in-vitro charger, and the charging parameters are parameters for determining the transmitting power Pi of the in-vitro charger. The external charger responds to the environment temperature change during charging each time, the problem that the external charger is overheated due to insufficient heat dissipation is effectively solved, and the safety of a patient in the using process is guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of medical equipment charging, and in particular to an in vitro charger and a temperature control method thereof. Background Art

[0002] In implantable medical systems, wireless charging technology has been widely used due to its convenience without the need for physical connection. Wireless charging usually uses magnetic coupling or magnetic resonance technology to transfer the energy of the external charger to the coil of the implantable medical device through an alternating magnetic field, thereby powering the implantable medical device or charging its internal battery.

[0003] In order to achieve a longer wireless charging distance, the in vitro wireless charger needs to increase the coil current as much as possible to enhance the transmitting magnetic field. The common method is to use an LC resonant circuit. At the resonant frequency point, the impedance of the resonant circuit is minimum and the coil current reaches the maximum. To further improve the charging efficiency and distance, the key is to reduce the equivalent series resistance (ESR) of the coil and the resonant capacitor to optimize the frequency selection characteristics of the circuit, thereby achieving a higher coil current at the resonant frequency point.

[0004] However, in actual applications, due to the complex and diverse environment in which patients live, especially in different seasons and climate conditions, the ambient temperature will have a significant impact on the working state of the external charger. For example, in the hot summer environment, the heat dissipation of the device is affected, and the external charger may heat up faster. These environmental changes not only affect the efficiency and stability of the external charger, but also pose a potential risk to the safety of the patient. Summary of the invention

[0005] In view of this, the present invention provides a temperature control method for an external charger, comprising:

[0006] S1, collecting the ambient temperature T0 of the external charger;

[0007] S2, wirelessly charging the implantable medical device with a maximum power Pmax using the charging transmitting coil in the external charger;

[0008] S3, calculating a transmit power control target Pref according to the ambient temperature T0 and the temperature threshold Tref;

[0009] S4, during the wireless charging process, collecting the current I of the charging transmitting coil;

[0010] S5, calculating the heating power P of the charging transmitting coil according to the current I and the internal resistance R;

[0011] S6, adjusting a charging parameter according to a difference between the heating power P and the transmission power control target Pref to limit a temperature rise of the external charger, wherein the charging parameter is a parameter that determines the transmission power Pi of the external charger.

[0012] Optionally, the charging parameters include a charging voltage V and a transmitting frequency f.

[0013] Optionally, adjusting the charging parameters according to the difference between the heating power P and the transmission power control target Pref includes:

[0014] S601A, determining whether the heating power P exceeds the transmission power control target Pref, if so, executing step S602A;

[0015] S602A, adjusting the transmitting frequency f to deviate from the resonant frequency F, so as to reduce the current I of the charging transmitting coil;

[0016] S603A, determining whether the adjusted transmission frequency f exceeds the transmission frequency threshold Fref, if so, executing step S604A;

[0017] S604A, stop adjusting the transmitting frequency f, and reduce the charging voltage V to reduce the current I of the charging transmitting coil, and return to step S4.

[0018] Optionally, before adjusting the charging parameter according to the difference between the heating power P and the transmission power control target Pref, the method further includes:

[0019] S601B, collecting the current temperature T of the charging transmitting coil;

[0020] The charging voltage V and the transmitting frequency f are adjusted according to the comparison control between the charging transmitting coil temperature T and the temperature threshold Tref.

[0021] Optionally, the charging voltage V and the transmitting frequency f are adjusted according to the comparison control of the charging transmitting coil temperature T and the temperature threshold Tref, including:

[0022] S602B, determining whether the temperature T of the charging transmitting coil exceeds the temperature threshold Tref, if so, executing step S603B;

[0023] S603B, adjusting the transmitting frequency f to deviate from the resonant frequency F, so as to reduce the current I of the charging transmitting coil;

[0024] S604B, determine whether the adjusted transmission frequency f exceeds the transmission frequency threshold Fref, if so, execute step S605B;

[0025] S605B, stop adjusting the transmitting frequency f, and reduce the charging voltage V to reduce the current I of the charging transmitting coil, and return to step S4.

[0026] Optionally, if the charging transmitting coil temperature T does not exceed the temperature threshold Tref, step S606B is executed to determine whether the heating power P exceeds the transmitting power control target Pref, and if so, step S603B is executed.

[0027] Optionally, when the heating power P does not exceed the transmission power control target Pref, return to step S4.

[0028] Optionally, when the heating power P does not exceed the transmission power control target Pref, the method further includes:

[0029] S607B, calculating the difference between the transmit power control target Pref and a preset power difference ΔP;

[0030] S608B, determining whether the heating power P does not exceed the difference, if so, executing step S609B, otherwise, returning to step S4;

[0031] S609B, increasing the charging voltage V to increase the current I of the charging transmitting coil.

[0032] Optionally, after the charging voltage V is increased, the method further includes step S610B, determining whether the increased charging voltage V reaches the maximum charging voltage Vmax, if so, executing step S611B, otherwise, returning to step S4;

[0033] S611B, stop increasing the charging voltage V, and adjust the transmitting frequency f to be close to the resonant frequency F to increase the current I of the charging transmitting coil, and return to step S4.

[0034] A second aspect of the present invention provides an in vitro charger, which includes: a charging transmitting coil, a temperature measuring unit, a current measuring unit and a drive control unit, wherein the charging transmitting coil is used to wirelessly charge an implanted neural device, the temperature measuring unit is used to measure the temperature before and after wireless charging, the current measuring unit is used to measure the current of the charging transmitting coil, and the drive control unit is used to execute any one of the in vitro charger temperature control methods described.

[0035] The present invention effectively solves the problem of the external charger heating up during wireless charging. First, the initial conditions are set by measuring the ambient temperature T0, which helps to adapt to the charging needs in different seasons and climatic conditions, and then wireless charging is performed at the maximum power Pmax, which ensures high efficiency and fast charging; the present invention determines the transmission power control target Pref by combining the ambient temperature T0 and the temperature threshold Tref calculation, and monitors the transmitting coil current I, adjusts the charging parameters, and thus adjusts the current of the charging transmitting coil to ensure that the temperature of the external charger is within a safe range. This not only optimizes the efficiency and speed of wireless charging, but also improves the safety and reliability of the charging equipment. By responding to changes in ambient temperature each time charging, the problem of overheating of the external charger caused by poor environmental heat dissipation is effectively prevented, and the safety of patients during use is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 is a structural diagram of an external charger in an embodiment of the present invention;

[0038] Figure 2 is a flow chart of a temperature control method of an external charger in an embodiment of the present invention;

[0039] Figure 3 This is a flow chart of the first method of adjusting charging parameters in an embodiment of the present invention;

[0040] Figure 4 This is a flow chart of the second method of adjusting charging parameters in an embodiment of the present invention;

[0041] Figure 5 This is a flowchart of the third method of adjusting charging parameters in an embodiment of the present invention. DETAILED DESCRIPTION

[0042] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0044] like Figure 1 As shown, an embodiment of the present invention provides an in vitro charger, including: a charging transmitting coil 1, a temperature measuring unit 2, a current measuring unit 3 and a driving control unit 4, wherein the charging transmitting coil 1 is used to wirelessly charge an implantable medical device, the temperature measuring unit 2 is used to measure the ambient temperature of the in vitro charger, the current measuring unit 3 is used to measure the current of the charging transmitting coil, and the driving control unit 4 is used to execute the following in vitro charger temperature control method.

[0045] like Figure 2 As shown, an embodiment of the present invention provides a temperature control method for an external charger, which is performed by the external charger and specifically includes:

[0046] S1 , collecting the ambient temperature T0 of the external charger. The ambient temperature T0 is the temperature of the medium in which the external charger is located, such as the indoor temperature, and can be collected by the temperature measurement unit 2 .

[0047] S2, using the charging transmitting coil in the external charger to wirelessly charge the implantable medical device at a maximum power Pmax.

[0048] Wireless charging is achieved by generating an alternating magnetic field through the charging transmitter coil in the external charger, which forms a magnetic resonance coupling with the receiving coil in the implanted medical device to achieve efficient energy transmission. The purpose of wireless charging with maximum power Pmax is to achieve maximum energy transmission efficiency and charging speed under the conditions of optimal resonant frequency and impedance matching. Among them, the maximum power Pmax can be determined by the maximum charging voltage Vmax and the resonant frequency F.

[0049] S3, calculating a transmit power control target Pref according to the ambient temperature T0 and the temperature threshold Tref.

[0050] Where Pref = k(Tref-T0), k is the thermal conductivity. When charging, considering that the ambient temperature will affect the heat dissipation, it is necessary to ensure that the device is maintained within a safe temperature range. The temperature difference calculated by the ambient temperature T0 and the temperature threshold Tref is combined with the influence of the ambient thermal conductivity k to determine the transmission power control target Pref, so that in subsequent charging, the device can be prevented from overheating due to excessive heating power to ensure charging efficiency and patient safety. In this embodiment, different k values ​​can be selected according to the wearing method of the external charger, such as placing the bare device outside the body, placing it outside the body with the help of different types of wearable accessories, wearing it inside outer clothing, etc. Different k values ​​can be preset according to each wearing method for users to choose when charging.

[0051] S4, during the wireless charging process, collecting the current I of the charging transmitting coil.

[0052] The current measuring unit is used to measure the current I of the charging transmitting coil in real time. In actual use, the current I of the charging transmitting coil may change due to changes in the position of the coil inside and outside the body caused by the user's posture, etc.

[0053] S5, calculating the heating power P of the charging transmitting coil according to the current I and the internal resistance R.

[0054] S6, adjusting the charging parameters according to the difference between the heating power P and the transmission power control target Pref to limit the temperature rise of the external charger. The charging parameters are parameters that determine the transmission power Pi of the external charger. The charging parameters include the charging voltage V and the transmission frequency f.

[0055] The present invention adjusts the current of the charging transmitting coil by adjusting the charging parameters according to the difference between the heating power P and the transmitting power control target Pref, thereby controlling the temperature rise of the external charger.

[0056] The present invention effectively solves the problem of external charger heating up during wireless charging. First, the initial conditions are set by measuring the ambient temperature T0, which helps to adapt to the charging needs in different seasons and climatic conditions, and then wireless charging is performed at the maximum power Pmax, which ensures high efficiency and fast charging. However, in practical applications, the impact of ambient temperature on the external charger cannot be ignored. Especially in high temperature environments, the external charger may accelerate the temperature rise due to poor heat dissipation, which in turn leads to safety hazards. The present invention determines the transmission power control target Pref by combining the ambient temperature T0 and the temperature threshold Tref calculation, and monitors the transmitting coil current I, adjusts the charging parameters, and thus adjusts the current of the charging transmitting coil to ensure that the temperature of the external charger is within a safe range. This not only optimizes the efficiency and speed of wireless charging, but also improves the safety and reliability of the charging equipment. By responding to changes in ambient temperature each time charging, the problem of overheating of the external charger caused by poor environmental heat dissipation is effectively prevented, and the safety of patients during use is guaranteed.

[0057] In one embodiment, according to the measured charging transmitter coil current I and the known charging transmitter coil internal resistance R, step S5 calculates the heating power P of the charging transmitter coil in the following manner:

[0058] P = I × I × R / 2.

[0059] like Figure 3 As shown, in one embodiment, step S6 specifically includes:

[0060] S601A, determine whether the heating power P exceeds the transmission power control target Pref. If the heating power P exceeds the transmission power control target Pref, execute step S602A; if the heating power P does not exceed the transmission power control target Pref, return to step S4 and continue to monitor whether the heating power P of the charging transmission coil exceeds the transmission power control target Pref.

[0061] S602A, adjusting the transmitting frequency f to deviate from the resonant frequency F, so as to reduce the current I of the charging transmitting coil.

[0062] If P≥Pref, it indicates that the heating power at this time exceeds the heat dissipation capacity of the current environment. Continuous high heating power may cause the temperature to gradually rise, increasing the risk of overheating. Therefore, it is necessary to reduce the current I of the charging transmitting coil.

[0063] After step S602A, the method further includes step S603A:

[0064] S603A, determining whether the adjusted transmission frequency f exceeds the transmission frequency threshold Fref.

[0065] When adjusting the transmission frequency f to reduce the current I of the charging transmission coil, it is necessary to monitor the frequency and determine the relationship with the frequency threshold. If the adjusted transmission frequency f does not exceed the transmission frequency threshold Fref, return to step S4 and continue to monitor whether the heating power P of the charging transmission coil exceeds the transmission power control target Pref; otherwise, if the adjusted transmission frequency f exceeds the transmission frequency threshold Fref, execute step S604A.

[0066] S604A, stop adjusting the transmission frequency f, and reduce the charging voltage V to reduce the current I of the charging transmitting coil, and return to step S4, and continue to monitor whether the heating power P of the charging transmitting coil exceeds the transmission power control target Pref.

[0067] If the transmitting frequency f exceeds the transmitting frequency threshold Fref, it means that the transmitting frequency f can no longer be adjusted and the charging voltage V needs to be further reduced to reduce the current I of the charging transmitting coil. After the charging voltage V is subsequently reduced, return to step S4 to ensure that the external charger continues to operate normally under the new setting.

[0068] This embodiment achieves precise management of the temperature of the external charger during long-distance wireless charging from the outside of the body to the inside of the body. First, the excessive heating is identified by judging whether the heating power P exceeds the control target Pref, and then the frequency selection characteristics of the high Q value coil are given priority, and the transmission frequency f is adjusted to reduce the current I of the charging transmission coil, so that the heating can be reduced quickly and effectively. In order to ensure the normal operation of the external charger, if the transmission frequency can no longer be adjusted, the current is further reduced by reducing the charging voltage V. This series of steps ensures that the external charger can be maintained within a safe temperature range, greatly improves the safety of the charging process, and avoids personal injury caused by excessive heating of the equipment.

[0069] like Figure 4 As shown, in another embodiment, step S6 specifically includes:

[0070] S601B, collecting the temperature T of the current charging transmitting coil. In this step, the temperature T of the current charging transmitting coil may be measured by a temperature measuring unit.

[0071] S602B, determine whether the charging transmitting coil temperature T exceeds the temperature threshold Tref. If the charging transmitting coil temperature T exceeds the temperature threshold Tref, execute step S603B.

[0072] S603B, adjusting the transmitting frequency f to deviate from the resonant frequency F, so as to reduce the current I of the charging transmitting coil.

[0073] If T≥Tref, it indicates that the temperature of the external charger is too high and needs to be cooled down, so the current I of the charging transmitting coil needs to be reduced.

[0074] After step S603B, the method further includes step S604B:

[0075] S604B, determining whether the adjusted transmission frequency f exceeds the transmission frequency threshold Fref.

[0076] If the current transmission frequency f does not exceed the transmission frequency threshold Fref, return to step S4 and continue to monitor the charging transmission coil temperature T and the heating power P; otherwise, if the current transmission frequency f exceeds the transmission frequency threshold Fref, execute step S605B.

[0077] S605B, stop adjusting the transmitting frequency f, and reduce the charging voltage V to reduce the current I of the charging transmitting coil, and return to step S4, and continue to monitor the temperature T and heating power P of the charging transmitting coil.

[0078] Furthermore, in step S602B, it further includes: if the charging transmitting coil temperature T does not exceed the temperature threshold Tref, step S606B needs to be executed.

[0079] S606B, determine whether the heating power P exceeds the transmission power control target Pref.

[0080] If T<Tref, it indicates that the temperature of the charging transmitting coil is normal at this time, but the heating power P needs to be monitored again, because long-term high heating power will gradually accumulate heat and increase the risk of overheating. Therefore, the heating power P needs to be monitored when the temperature is normal.

[0081] If the heating power P exceeds the transmission power control target Pref, the process proceeds to step S603B to adjust the transmission frequency f to deviate from the resonance frequency F, so as to reduce the current I of the charging transmission coil.

[0082] If the heating power P does not exceed the transmitting power control target Pref, the current external charger power is normal, and the process returns to step S4, and continues to monitor the charging transmitting coil temperature T and the heating power P.

[0083] This embodiment realizes real-time dynamic management and optimization of the temperature of the external charger. First, by collecting the temperature T of the charging transmitting coil and comparing it with the temperature threshold Tref, it is ensured that the transmitting frequency f is adjusted in time to reduce the current I when the temperature of the charging transmitting coil is too high, thereby effectively reducing the heat. If the transmitting frequency can no longer be adjusted, the current is further controlled by reducing the charging voltage V. Even when the temperature T of the charging transmitting coil is normal, the heating power P is continuously monitored to prevent the risk of overheating caused by the accumulation of heat due to long-term high heating power. This series of measures ensures that the external charger remains within a safe temperature range, greatly improving the safety of the charging process.

[0084] like Figure 5 As shown, when the heating power P does not exceed the transmission power control target Pref, it also includes:

[0085] S607B, calculating the difference between the transmit power control target Pref and the preset power difference ΔP.

[0086] The above difference is expressed as Pref-ΔP; if P < Pref, it means that the temperature is normal and the heating power does not exceed the target Pref, that is, it is in a low current state. At this time, it is necessary to determine whether the current charging power is very low. When the temperature and heating power are within a safe range, power optimization can prevent the problem of insufficient charging power. Keeping the charging power in the best state for a long time helps to extend the life of the equipment and improve the stability of the system.

[0087] After step S607B, the method further includes step S608B:

[0088] S608B, determine whether the heating power P does not exceed the difference. If the heating power P does not exceed the difference, execute step S609B; otherwise, if the heating power P exceeds the difference, the current external charger temperature and heating power are normal, return to step S4, and continue to monitor the temperature T and heating power P of the charging transmitter coil.

[0089] S609B, increase the charging voltage V to increase the current I of the charging transmitting coil.

[0090] If P<Pref-ΔP, it indicates that the heating power is not within a reasonable range, which means that there is room for improvement in the charging power. The charging voltage V needs to be increased to increase the current I of the charging transmitting coil. The charging power can be increased while ensuring that the temperature and heating power are within a safe range.

[0091] Furthermore, after step S609B, the method further includes:

[0092] S610B, determining whether the increased charging voltage V reaches the maximum charging voltage Vmax.

[0093] The purpose of judging whether the increased charging voltage V reaches the maximum charging voltage Vmax is to ensure that the upper limit of the safety voltage of the device is not exceeded when the charging voltage is increased, so as to prevent overvoltage from damaging the device. If the current charging voltage V reaches the maximum charging voltage Vmax, step S611B is executed; otherwise, if the current charging voltage V does not reach the maximum charging voltage Vmax, step S4 is returned, and the charging transmitting coil temperature T and heating power P are continuously monitored.

[0094] S611B, stop increasing the charging voltage V, and adjust the transmitting frequency f to be close to the resonant frequency F to increase the current I of the charging transmitting coil, and return to step S4, and continue to monitor the charging transmitting coil temperature T and heating power P.

[0095] In this embodiment, if V=Vmax, it indicates that the charging voltage has reached the maximum safe voltage at this time. Continuing to increase the voltage may cause overvoltage to damage the device. Therefore, it is necessary to stop increasing the voltage first, and then adjust the transmitting frequency f to be close to the resonant frequency F, so as to increase the current I of the charging transmitting coil, and use a higher current I to increase the charging power. If the charging voltage has not yet reached the maximum value Vmax, the temperature and heating power will continue to be monitored so that further adjustments can be made when necessary. In the current callback process of this embodiment, because the excitation condition of the closed-loop regulation is closer to the ideal power range, the voltage regulation is performed first, and then the frequency regulation is performed, so that the charging power response can be more stable. In other embodiments, the frequency can be adjusted first and then the voltage can be adjusted to achieve faster adjustment.

[0096] This embodiment dynamically adjusts the charging voltage and transmission frequency under different temperature and power environments to achieve optimal charging performance and system safety. First, the temperature of the charging transmission coil is collected in real time and adjusted according to the target control temperature to ensure that the temperature is within a safe range. When the temperature is too high, the system adjusts the transmission frequency to reduce the current to prevent overheating; when the power is insufficient, the transmission frequency and voltage are increased to optimize the power output. Through this dynamic adjustment mechanism, the problems of overheating and insufficient power are effectively prevented, the life of the external charger is extended, and the stability is improved. By judging in real time whether the voltage has reached the maximum safe value and adjusting accordingly, it is ensured that the charging process is always in an efficient and safe state.

[0097] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0098] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0099] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0100] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0101] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A method for controlling the temperature of an external charger, characterized in that: include: S1, collecting the ambient temperature T0 of the external charger; S2, wirelessly charging the implantable medical device with a maximum power Pmax using the charging transmitting coil in the external charger; S3, calculating a transmit power control target Pref according to the ambient temperature T0 and the temperature threshold Tref; S4, during the wireless charging process, collecting the current I of the charging transmitting coil; S5, calculating the heating power P of the charging transmitting coil according to the current I and the internal resistance R; S6, adjusting a charging parameter according to a difference between the heating power P and the transmission power control target Pref to limit a temperature rise of the external charger, wherein the charging parameter is a parameter that determines the transmission power Pi of the external charger.

2. The method according to claim 1, characterized in that The charging parameters include charging voltage V and transmitting frequency f.

3. The method according to claim 2, characterized in that Adjusting the charging parameters according to the difference between the heating power P and the transmission power control target Pref includes: S601A, determining whether the heating power P exceeds the transmission power control target Pref, if so, executing step S602A; S602A, adjusting the transmitting frequency f to deviate from the resonant frequency F, so as to reduce the current I of the charging transmitting coil; S603A, determining whether the adjusted transmission frequency f exceeds the transmission frequency threshold Fref, if so, executing step S604A; S604A, stop adjusting the transmitting frequency f, and reduce the charging voltage V to reduce the current I of the charging transmitting coil, and return to step S4.

4. The method according to claim 2, characterized in that: Before adjusting the charging parameter according to the difference between the heating power P and the transmission power control target Pref, the method further includes: S601B, collecting the current temperature T of the charging transmitting coil; The charging voltage V and the transmitting frequency f are adjusted according to the comparison control between the charging transmitting coil temperature T and the temperature threshold Tref.

5. The method according to claim 4, characterized in that The charging voltage V and the transmitting frequency f are adjusted according to the comparison control of the charging transmitting coil temperature T and the temperature threshold Tref, including: S602B, determining whether the temperature T of the charging transmitting coil exceeds the temperature threshold Tref, if so, executing step S603B; S603B, adjusting the transmitting frequency f to deviate from the resonant frequency F, so as to reduce the current I of the charging transmitting coil; S604B, determine whether the adjusted transmission frequency f exceeds the transmission frequency threshold Fref, if so, execute step S605B; S605B, stop adjusting the transmitting frequency f, and reduce the charging voltage V to reduce the current I of the charging transmitting coil, and return to step S4.

6. The method according to claim 5, characterized in that If the charging transmitting coil temperature T does not exceed the temperature threshold Tref, step S606B is executed to determine whether the heating power P exceeds the transmitting power control target Pref. If so, step S603B is executed.

7. The method according to claim 6, characterized in that When the heating power P does not exceed the transmission power control target Pref, the process returns to step S4.

8. The method according to claim 6, characterized in that When the heating power P does not exceed the transmission power control target Pref, the method further includes: S607B, calculating the difference between the transmit power control target Pref and a preset power difference ΔP; S608B, determining whether the heating power P does not exceed the difference, if so, executing step S609B, otherwise, returning to step S4; S609B, increasing the charging voltage V to increase the current I of the charging transmitting coil.

9. The method according to claim 8, characterized in that After the charging voltage V is increased, the process further includes step S610B, determining whether the increased charging voltage V reaches the maximum charging voltage Vmax, if so, executing step S611B, otherwise, returning to step S4; S611B, stop increasing the charging voltage V, and adjust the transmitting frequency f to be close to the resonant frequency F to increase the current I of the charging transmitting coil, and return to step S4.

10. An external charger, characterized in that: include: A charging transmitting coil, a temperature measuring unit, a current measuring unit and a driving control unit, wherein the charging transmitting coil is used to wirelessly charge an implantable medical device, the temperature measuring unit is used to measure the ambient temperature of the external charger, the current measuring unit is used to measure the current of the charging transmitting coil, and the driving control unit is used to execute the external charger temperature control method according to any one of claims 1 to 9.

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