Implantable medical device and charging control method thereof

Abstract

The invention provides implantable medical equipment and a charging control method thereof. The invention is applied to the medical equipment charging field. The method comprises the steps that in the process that an in-vitro charger conducts wireless charging on the implantable medical equipment, charging current I collection and battery voltage V collection are collected; calculating a calibration voltage V according to the battery voltage V acquisition, the charging current I acquisition and a battery internal resistance R of the implantable medical device, the battery internal resistance R being an internal resistance value corresponding to the battery voltage V acquisition and / or the charging current I acquisition obtained according to a battery internal resistance calibration test; and acquiring and judging whether the implantable medical equipment is fully charged or not according to the calibration voltage V and the charging current I. According to the invention, accurate monitoring of the electric quantity state of the battery and efficient management of the charging process are realized.

Description

Technical Field

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

[0002] With the development of modern medical technology, implantable medical devices (such as cardiac pacemakers, brain pacemakers, etc.) play an increasingly important role in the treatment of chronic diseases. These devices usually rely on rechargeable batteries to ensure their long-term stable operation. In order to meet the charging needs of these devices, in vitro wireless charging technology has emerged. This technology transmits electrical energy from outside the body to the body through magnetic coupling or magnetic resonance transmission to charge the battery inside the implantable medical device.

[0003] The battery charging process includes a constant current charging stage and a constant voltage charging stage. In the constant current charging stage, the battery receives a stable current input until the battery voltage reaches a preset value; then it enters the constant voltage charging stage, the battery voltage remains constant, and the current gradually decreases until the charging is completed. To improve charging efficiency, current implantable medical devices can support high-power charging. However, when charging at high power, the voltage drop problem on the battery's internal resistance becomes non-negligible. For example, at a charging current of 100mA, an internal resistance of 1 to 2Ω may cause a voltage drop of 0.1 to 0.2V, which directly affects the voltage measurement at the battery end.

[0004] The voltage drop across the battery's internal resistance causes inaccurate power detection, making it difficult to judge the charging status, which not only brings inconvenience and misjudgment to users, but also affects the battery's charging efficiency and life. Summary of the invention

[0005] In view of this, the present invention provides, on one hand, a charging control method for an implantable medical device, comprising:

[0006] When the external charger is wirelessly charging the implanted medical device, the charging current I 采集 and battery voltage V 采集 ;

[0007] According to the battery voltage V 采集 , the charging current I 采集 and the battery internal resistance R of the implantable medical device to calculate the calibration voltage V, wherein the battery internal resistance R is obtained according to the battery internal resistance calibration test and the battery voltage V 采集 and / or charging current I 采集 Corresponding internal resistance value;

[0008] According to the calibration voltage V and the charging current I 采集 Determine if an implantable medical device is fully charged.

[0009] Optionally, before calculating the calibration voltage V, the following steps are included:

[0010] For the constant current charging stage, the battery voltage before charging and the battery voltage V during the constant current charging stage are collected. 采集 ;

[0011] According to the battery voltage before charging and the battery voltage V in the constant current charging stage 采集 Calculate the voltage difference ΔV before and after charging during the constant current charging stage;

[0012] Calculate the battery internal resistance Ri according to the voltage difference ΔV and the constant current charging current Icc;

[0013] Monitor whether it enters the constant voltage charging stage;

[0014] After entering the constant voltage charging stage, charging is suspended and the battery voltage V before charging is suspended is collected. 采集 and charging current I 采集 , and the battery voltage after charging is suspended;

[0015] Calculate the voltage difference ΔV' before and after the charging is suspended in the constant voltage charging stage according to the battery voltage before and after the charging is suspended;

[0016] According to the voltage difference ΔV' and the charging current I 采集 Calculate the battery internal resistance Ro;

[0017] Determine the battery internal resistance Ri and battery voltage V during the constant current charging stage according to the battery internal resistance Ri and battery internal resistance Ro 采集 The corresponding relationship Ri=f(V 采集 ).

[0018] Optionally, before calculating the calibration voltage V, the following steps are included:

[0019] For the constant current charging stage, the battery voltage before charging and the battery voltage V during the constant current charging stage are collected. 采集 ;

[0020] According to the battery voltage before charging and the battery voltage V in the constant current charging stage 采集 Calculate the voltage difference ΔV before and after charging during the constant current charging stage;

[0021] Calculate the battery internal resistance Ri according to the voltage difference ΔV and the constant current charging current Icc;

[0022] When the external charger performs constant current charging on the implantable medical device, the charging is periodically paused and resumed, and the battery voltage V before and after each charging is collected. 采集 ;

[0023] The voltage difference ΔV is calculated based on the battery voltage before and after each charging, and the battery internal resistance Ri is calculated based on the constant current charging current Icc;

[0024] The battery internal resistance Ri and battery voltage V during the constant current charging phase are determined based on the battery internal resistance Ri calculated when charging is resumed after each pause. 采集 The corresponding relationship Ri=f(V 采集 ).

[0025] Optionally, before calculating the calibration voltage V, the following steps are included:

[0026] In the constant voltage charging stage, when the external charger is charging the implantable medical device at a constant voltage, the charging is periodically suspended, and the battery voltage V before the charging is suspended is collected. 采集 and charging current I 采集 , and the battery voltage after charging is suspended;

[0027] The voltage difference ΔV' is calculated based on the battery voltage before and after each charging pause, and the charging current I 采集 Calculate the battery internal resistance Ro;

[0028] Determine the battery internal resistance Ro and charging current I during the constant voltage charging stage according to the battery internal resistance Ro during each charging pause. 采集 The corresponding relationship Ro=f(I 采集 ).

[0029] Optionally, the voltage difference ΔV is calculated according to the battery voltage before and after each charging, and the battery internal resistance Ri is calculated according to the constant current charging current Icc, including:

[0030] The battery internal resistance Ri1 is calculated using the voltage difference ΔV1 before and after each charging pause and the constant current charging current Icc;

[0031] The battery internal resistance Ri2 is calculated using the voltage difference ΔV2 before and after each charging start and the constant current charging current Icc;

[0032] The battery internal resistance Ri is obtained by averaging the battery internal resistance Ri1 and the battery internal resistance Ri2.

[0033] Optionally, the voltage difference ΔV' is calculated according to the battery voltage before and after each charging pause, and the charging current I 采集 Calculate the battery internal resistance Ro, including:

[0034] Using the charging current I before stopping charging 采集 , the voltage difference ΔV1' before and after stopping charging, calculate the battery internal resistance Ro1;

[0035] The voltage difference ΔV2' before and after recovery charging and the charging current I after recovery charging are used. 采集 Calculate the battery internal resistance Ro2;

[0036] The battery internal resistance Ro is obtained by averaging the battery internal resistance Ro1 and the battery internal resistance Ro2.

[0037] Optionally, according to the battery voltage V 采集 , the charging current I 采集 The calibration voltage V is calculated based on the battery internal resistance R of the implantable medical device, including:

[0038] During the constant current charging phase, according to the battery voltage V 采集 And the corresponding relationship Ri=f(V 采集 ) Determine the battery internal resistance Ri and calculate the calibration voltage V = V 采集 -Icc·Ri, where Icc is the constant current charging current.

[0039] Optionally, according to the battery voltage V 采集 , the charging current I 采集 The calibration voltage V is calculated based on the battery internal resistance R of the implantable medical device, including:

[0040] In the constant voltage charging stage, according to the charging current I 采集 And the corresponding relationship Ro = f(I 采集 ) Determine the battery internal resistance Ro and calculate the calibration voltage V = Vc-I 采集 ·Ro, where Vc is the constant voltage charging voltage.

[0041] Optionally, according to the calibration voltage V and the charging current I 采集 Determine if the implantable medical device is fully charged:

[0042] Determine whether the calibration voltage V reaches the full charge threshold voltage V full , and judge the charging current I 采集 Is it less than or equal to the full charge threshold current I full .

[0043] A second aspect of the present invention provides an implantable medical device, which includes: a processor and a memory connected to the processor; wherein the memory stores instructions executable by the processor, and the instructions are executed by the processor so that the processor executes the above-mentioned implantable medical device charging control method.

[0044] The present invention acquires the corresponding battery internal resistance by real-time acquisition of charging current and battery voltage, thereby calculating and calibrating the actual voltage, thereby achieving accurate monitoring of the battery status and efficient management of the charging process. This method ensures the display accuracy of the charging power during each charging process by regularly calibrating the battery internal resistance, thereby improving the overall reliability of the charging system.

[0045] In addition, this solution only needs to calibrate the battery internal resistance R during the battery internal resistance calibration test, and does not frequently interrupt the charging operation to calculate the internal resistance during each charging process. This effectively avoids the problem of excessive load changes caused by frequent charging interruptions, thereby significantly improving the stability of the closed-loop control response of the wireless charging system. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] 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.

[0047] Figure 1 is a flow chart of a charging control method for an implantable medical device in an embodiment of the present invention;

[0048] Figure 2 A diagram of a voltage acquisition method in a constant current charging stage in an embodiment of the present invention;

[0049] Figure 3 A diagram of a voltage acquisition method for suspending charging in a constant voltage charging stage in an embodiment of the present invention;

[0050] Figure 4 This is a diagram of a voltage acquisition method for suspending charging during a constant current charging stage in an embodiment of the present invention. DETAILED DESCRIPTION

[0051] 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.

[0052] 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.

[0053] like Figure 1 As shown, an embodiment of the present invention provides a charging control method for an implantable medical device, which is executed by the implantable medical device and specifically includes:

[0054] S1, when the external charger is wirelessly charging the implantable medical device, the charging current I is collected 采集 and battery voltage V 采集 .

[0055] The external charger includes a transmitting coil, and the implantable medical device includes a receiving coil, a rechargeable battery, and a microcontroller. The external charger uses magnetic coupling / magnetic resonance technology to wirelessly charge the implantable medical device. The transmitting coil of the external charger transfers energy to the receiving coil of the implantable medical device through an alternating magnetic field, thereby charging the rechargeable battery. Before charging, the external charger will send a charging instruction to the implantable medical device and wirelessly charge the implantable medical device. During the wireless charging process, the battery voltage V can be collected in real time by the microcontroller in the implantable medical device. 采集 and charging current I 采集 .

[0056] S2, according to the battery voltage V 采集 、Charging current I 采集 The calibration voltage V is calculated based on the battery internal resistance R of the implantable medical device, where the battery internal resistance R is obtained based on the battery internal resistance calibration test and the battery voltage V 采集 and / or charging current I 采集 Corresponding internal resistance value. During the battery internal resistance calibration test, the battery internal resistance value is calculated based on the battery voltage difference and the corresponding charging current before and after the in vitro charger wirelessly charges the implantable medical device.

[0057] Due to the internal resistance of the battery in the implantable medical device, the collected battery voltage V 采集 It cannot reflect the actual battery power, so it is necessary to calculate the battery voltage V according to the battery internal resistance R. 采集 The battery internal resistance R is obtained based on the battery internal resistance calibration test performed during the previous charging process. The test will obtain a number of battery voltages V 采集 -Charging current I 采集 -The corresponding relationship between the battery internal resistance R. When wireless charging is performed later, according to the collected battery voltage V 采集 and / or charging current I 采集 Find the corresponding battery internal resistance R to calculate the calibration voltage V. Specifically, the calibration voltage V can be calculated using the following formula:

[0058] V=V 采集 -I 采集 ×R

[0059] It is understandable that the above V 采集 In the constant voltage charging stage of the battery, the constant voltage charging voltage Vc can be taken; the above I 采集During the constant current charging stage of the battery, the value can be taken as the constant current charging current Icc.

[0060] S3, based on the calibration voltage V and charging current I 采集 Determine whether the implantable medical device is fully charged. If it is determined to be fully charged, stop charging. In one embodiment, step S3 specifically includes: determining whether the calibration voltage V reaches the full charge threshold voltage V full , and judge the charging current I 采集 Is it less than or equal to the full charge threshold current I full Among them, I full Usually it is 1 / 20 to 1 / 6 of the constant current charging current Icc.

[0061] In the actual charging process of this embodiment, it is determined in real time whether the calibration voltage V reaches the voltage V in the fully charged state. full , and judge whether the charging current I is less than or equal to the full charge threshold current I full The method ensures accurate monitoring of key parameters during the battery charging process, so that it can accurately identify whether the battery has reached a fully charged state. By monitoring and comparing voltage and current data in real time, the system can optimize the charging strategy, avoid overcharging, improve the safety and efficiency of battery charging, and extend the battery life.

[0062] The present invention collects the charging current I in real time 采集 and battery voltage V 采集 The corresponding battery internal resistance is obtained to calculate and calibrate the actual voltage V, thus realizing accurate monitoring of the battery status and efficient management of the charging process. This method ensures the accuracy of the charging power, realizes automatic control of the charging process by accurately judging the charging status, avoids overcharging and misjudgment of power, and improves the overall safety and reliability of the charging system.

[0063] In the actual charging process, before calculating the calibration voltage V in step S2, it is necessary to obtain the battery voltage V 采集 and / or charging current I 采集 The corresponding battery internal resistance R, the battery voltage V 采集 、Charging current I 采集 The battery voltage V obtained from the battery internal resistance calibration test 采集 -Charging current I 采集 -The corresponding relationship of the battery internal resistance R is matched to obtain the corresponding battery internal resistance R.

[0064] In addition, users do not need to perform battery internal resistance calibration test every time they charge. Users can choose whether to update the battery voltage V according to actual conditions. 采集 -Charging current I 采集-The corresponding relationship of the battery internal resistance R. When an update is required, the external charger issues an internal resistance calibration instruction during charging, and updates the corresponding relationship in the constant current charging stage and the constant voltage charging stage. Once updated, the battery resistance R is determined according to the latest updated corresponding relationship during the actual charging process.

[0065] In other battery voltage calibration methods, the battery charging process can be suspended periodically, and the battery voltage after pausing charging for a period of time is used as the battery voltage display during the battery charging process. However, since the charging process needs to be frequently interrupted, the load variation is too large for the wireless charging system, which is not conducive to the closed-loop control response of the wireless charging system. In comparison, the improvement made in this solution only requires the calibration of the battery internal resistance R during the battery internal resistance calibration test, and does not frequently interrupt the charging operation to calculate the internal resistance during each charging process, effectively avoiding the problem of excessive load variation caused by frequent charging interruptions, thereby significantly improving the stability of the closed-loop control response of the wireless charging system.

[0066] The following are some methods to calculate the battery internal resistance R and charging current I in a charging process. 采集 and battery voltage V 采集 method of relationship.

[0067] The first calculation method includes the following specific steps:

[0068] For the constant current charging stage, the battery voltage before charging and the battery voltage V during the constant current charging stage are collected. 采集 .

[0069] According to the battery voltage before charging and the battery voltage V in the constant current charging stage 采集 Calculate the voltage difference ΔV before and after charging during the constant current charging stage.

[0070] The battery internal resistance Ri is calculated based on the voltage difference ΔV and the constant current charging current Icc.

[0071] Monitor whether it enters the constant voltage charging stage.

[0072] After entering the constant voltage charging stage, charging is suspended and the battery voltage V before charging is suspended is collected. 采集 and charging current I 采集 , and the battery voltage after charging is suspended.

[0073] The voltage difference ΔV′ before and after the charging is suspended in the constant voltage charging stage is calculated according to the battery voltage before and after the charging is suspended.

[0074] According to the voltage difference ΔV' and the charging current I 采集 Calculate the battery internal resistance Ro.

[0075] Determine the battery internal resistance Ri and battery voltage V during the constant current charging stage according to the battery internal resistance Ri and battery internal resistance Ro 采集 Corresponding relationship Ri=f(V 采集 ).

[0076] Specifically, the wireless charging process will go through a constant current charging stage and a constant voltage charging stage. In this embodiment, the battery internal resistance R and the battery voltage V in the constant current stage are determined. 采集 Such as Figure 2 As shown, first, the battery voltage of the implantable medical device before charging is collected. After the external charger starts charging, the battery voltage V is collected after a preset time Δt1 (Δt1 has a value range of 1 to 5s). 采集 Since the constant current charging stage is charged with a constant charging current Icc, the battery internal resistance mainly changes with the battery voltage. Therefore, the battery internal resistance Ri=ΔV / Icc is calculated based on the voltage difference before and after charging (i.e., the voltage difference ΔV corresponding to Δt1) and the constant current charging current Icc.

[0077] Then, monitor whether the implantable medical device enters the constant voltage charging stage, monitor the charging voltage in real time, and judge the charging voltage V in real time. 采集 Whether the constant voltage charging voltage Vc is reached. If the constant voltage charging voltage Vc is reached, the implantable medical device is determined to enter the constant voltage charging stage. At this time, the implantable medical device sends a charging pause command to the external charger, and the external charger will stop charging and start timing. The external charger will automatically resume charging the implantable medical device after a preset time Δt2 (Δt2 ranges from 1 to 5s). Collect the battery voltage V before suspending charging 采集 and charging current I 采集 , and collect the battery voltage after the preset charging pause time Δt3 (Δt3<Δt2), and according to the voltage difference before and after the charging pause ( Figure 3 The voltage difference ΔV' before and after the pause and the charging current I 采集 Calculate the battery internal resistance Ro = ΔV' / I 采集 .

[0078] The battery internal resistance Ri can be considered as the battery internal resistance at the start of the constant current charging phase, and the battery internal resistance Ro can be considered as the battery internal resistance at the end of the constant current charging phase. 采集 ), using the linear fitting method, the battery internal resistance R and the battery voltage V during the constant current charging stage can be determined according to the battery internal resistance Ri and the battery internal resistance Ro. 采集 The corresponding relationship Ri=f(V 采集 ).

[0079] This embodiment calculates the battery internal resistance R by the voltage difference before and after charging in the constant current charging stage and when charging is suspended just after entering the constant voltage charging stage, and uses the linear interpolation method to establish the battery internal resistance Ri and the battery voltage V 采集 The corresponding relationship between the constant current charging state and the charging state can be monitored and calibrated in real time during actual charging according to the relationship, so that the charging can be accurately controlled.

[0080] The second calculation method:

[0081] For the constant current charging stage, the battery voltage before charging and the battery voltage V during the constant current charging stage are collected. 采集 ;

[0082] According to the battery voltage before charging and the battery voltage V in the constant current charging stage 采集 Calculate the voltage difference ΔV before and after charging during the constant current charging stage.

[0083] The battery internal resistance Ri is calculated based on the voltage difference ΔV and the constant current charging current Icc.

[0084] When the external charger performs constant current charging on the implantable medical device, the charging is periodically paused and resumed, and the battery voltage V before and after each charging is collected. 采集 .

[0085] The voltage difference ΔV is calculated based on the battery voltage before and after each charging, and the battery internal resistance Ri=ΔV / Icc is calculated based on the constant current charging current Icc.

[0086] The specific process of suspending charging is to stop charging, maintain for a period of time (several seconds), and start charging. Regarding the voltage difference ΔV, the voltage difference ΔV can be calculated by using the voltage before stopping charging and the voltage after maintaining for a period of time; or the voltage difference ΔV can be calculated by using the voltage maintained for a period of time and the voltage after starting charging. In the calculation process described above, only the latter is used as an example. It can be understood that the voltage difference before and after suspending charging can also be used in other embodiments, and the effect is similar.

[0087] In this embodiment, the battery internal resistance Ri and the battery voltage V during the constant current charging stage are determined according to the battery internal resistance Ri calculated when charging is resumed after each pause. 采集 The corresponding relationship Ri=f(V 采集 ).

[0088] like Figure 4 As shown, the difference from the first calculation method is that the second calculation method performs periodic charging suspension during the constant current charging stage. This embodiment first collects the battery voltage before charging and the battery voltage V during the constant current charging stage (after the charging starts for a preset time Δt1) 采集, calculate the battery internal resistance Ri based on the voltage difference. When charging is suspended periodically, collect the battery voltage before and after charging is resumed V 采集 , calculate the battery internal resistance Ri according to the voltage difference, thereby obtaining the battery internal resistance at each charging pause, and finally obtaining a number of battery internal resistances Ri in the constant current charging stage. After obtaining the data at the starting point of the constant current charging stage and the data when charging is paused multiple times during the constant current charging stage, these data can be fitted to obtain the battery voltage V in the entire constant current charging stage. 采集 The relationship between the internal resistance Ri of the battery and Ri=f(V 采集 ).

[0089] In this embodiment, based on the battery voltage data collected multiple times, the battery internal resistance Ri and the battery voltage V can be accurately fitted according to the multiple battery internal resistances Ri. 采集 In the actual charging process, the battery status in the constant current charging stage can be monitored in real time according to the corresponding relationship to ensure that the power display of the implantable medical device is accurate.

[0090] In a preferred embodiment, the periodic suspension and resumption of charging not only "calculates the voltage difference ΔV according to the battery voltage before and after each charging, and calculates the battery internal resistance Ri according to the constant current charging current Icc", but also includes:

[0091] The battery internal resistance Ri1 is calculated using the voltage difference ΔV1 before and after each charging pause and the constant current charging current Icc.

[0092] The battery internal resistance Ri2 is calculated using the voltage difference ΔV2 before and after each charging start and the constant current charging current Icc.

[0093] The battery internal resistance Ri is obtained by averaging the battery internal resistance Ri1 and the battery internal resistance Ri2.

[0094] Specifically, charging suspension includes stopping and starting actions. The voltage difference at one stop and the voltage difference at the next start of charging may be different, so the calculated internal resistance is different. This embodiment calculates the battery internal resistance by the voltage difference before and after the charging is suspended and the voltage difference before and after the charging is restarted, and takes the average value as the battery internal resistance Ri in the constant current charging stage. This method can more accurately calculate the battery internal resistance in the constant current charging stage, so that the fitting relationship Ri=f(V 采集 ) is more accurate, and thus the battery voltage can be accurately monitored during the actual charging process to optimize charging management and control. 采集 It can correspond to the voltage V collected before charging is suspended 采集1 , or the voltage V collected before and after restarting charging 采集2 , preferably V 采集1and V 采集2 The average value of .

[0095] The third calculation method:

[0096] In the constant voltage charging stage, when the external charger is charging the implantable medical device at a constant voltage, the charging is periodically suspended, and the battery voltage V before the charging is suspended is collected. 采集 and charging current I 采集 , and the battery voltage after charging is suspended.

[0097] The voltage difference ΔV' is calculated based on the battery voltage before and after each charging pause, and the charging current I 采集 Calculate the battery internal resistance Ro. The specific process of suspending charging is to stop charging, maintain for a period of time (several seconds), and start charging. Regarding the voltage difference ΔV', the voltage difference ΔV' can be calculated by using the voltage before stopping charging and the voltage maintained for a period of time; or the voltage difference ΔV' can be calculated by using the voltage maintained for a period of time and the voltage after starting charging. In the calculation process described above, only the former is used as an example. It can be understood that the voltage difference before and after suspending charging can also be used in other embodiments, and the effect is similar.

[0098] Determine the battery internal resistance Ro and charging current I during the constant voltage charging stage according to the battery internal resistance Ro during each charging pause. 采集 The corresponding relationship Ro=f(I 采集 ).

[0099] like Figure 3 As shown, after the wireless charging enters the constant voltage charging stage, it performs periodic charging suspension, and collects the battery voltage before and after each charging suspension and the charging current I before the charging suspension 采集 The battery voltage before the pause is a constant charging voltage Vc. Since the charging current will gradually decrease after the charging is paused, the collected charging current is the charging current at the pause time.

[0100] Then, the battery voltage is collected again after the preset time Δt3 (Δt3 ranges from 1 to 5 seconds) after the charging is suspended. The voltage difference ΔV' before and after the charging is suspended and the charging current I 采集 Calculate the battery internal resistance Ro, and finally fit the battery internal resistance Ro and charging current I during the constant voltage charging stage according to the several battery internal resistances Ro calculated during each charging pause. 采集 The corresponding relationship of .

[0101] This embodiment calculates the battery internal resistance Ro = ΔV' / I based on the voltage difference before and after each charging pause 采集 , and the battery internal resistance Ro and charging current I during the constant voltage charging stage are fitted according to the several battery internal resistances Ro obtained by periodic pauses.采集 The corresponding relationship includes a relational expression or a comparison table. The relational expression fitted by multiple battery internal resistances Ro is more accurate, so that the battery voltage can be accurately monitored during the actual charging process, and the charging management and control can be optimized.

[0102] In a preferred embodiment, during the periodic suspension of charging, not only "the voltage difference ΔV' is calculated based on the battery voltage before and after each suspension of charging, but also the charging current I 采集 Calculate the battery internal resistance Ro", but include:

[0103] Using the charging current I before stopping charging 采集 , the voltage difference ΔV1' before and after stopping charging, and calculate the battery internal resistance Ro1.

[0104] The voltage difference ΔV2' before and after recovery charging and the charging current I after recovery charging are used. 采集 Calculate the battery internal resistance Ro2.

[0105] The battery internal resistance Ro is obtained by averaging the battery internal resistance Ro1 and the battery internal resistance Ro2.

[0106] In this embodiment, each periodic charging suspension process includes two processes: stopping charging and starting charging. The voltage difference at one stop and the voltage difference at the next start of charging may be different, so the calculated internal resistance is different. This embodiment calculates the battery internal resistance according to the voltage difference before and after the charging suspension and the voltage difference before and after the charging continuation, and calculates the average value as the battery internal resistance Ro in the constant voltage charging stage. This method can more accurately calculate the battery internal resistance Ro in the constant voltage charging stage, so that the fitting relationship Ro=f(I 采集 ) is more accurate, and thus the battery voltage can be accurately monitored during the actual charging process, optimizing charging management and control. 采集 It can correspond to the current I collected before charging is suspended 采集1 , or the current I collected after continuing to charge 采集2 , preferably 1 采集1 and I 采集2 The average value of .

[0107] It should be noted that the above three calculation methods can be used one by one or in combination. For example, the third method of calculating the relationship between the constant voltage charging stage can be arbitrarily combined with the first or second method of calculating the relationship between the constant current charging stage, thereby obtaining the battery internal resistance data of the complete charging process including constant current charging and constant voltage charging. In addition, the second method of "calculating the battery internal resistance before and after resuming charging after each pause" can be replaced by calculating the battery internal resistance before and after each pause of charging. The third method of "calculating the battery internal resistance before and after each pause of charging" can be replaced by calculating the battery internal resistance before and after resuming charging after each pause.

[0108] It should also be noted that the charging process for calibrating the battery internal resistance and the charging process in the above steps S1 to S3 are two independent processes. In actual application, the charging process for calibrating the battery internal resistance can be performed once in a while, instead of having to calibrate the internal resistance before each charging.

[0109] As an example, an embodiment of a charging process that first performs internal resistance calibration and then performs normal charging operation is as follows:

[0110] After receiving the internal resistance calibration instruction from the external charger, the implantable medical device first collects the battery voltage before charging, and then collects the battery voltage V again after the external charger charges the implantable medical device, that is, after the constant current charging starts at Δt1 time. 采集 , calculate the voltage difference ΔV before and after charging, and then calculate the battery internal resistance Ri based on the voltage difference ΔV and the constant current charging current Icc; the implantable medical device will collect the battery voltage V in real time 采集 To determine whether to enter the constant voltage charging stage, if the voltage reaches the constant current charging voltage Vc, it is determined to enter the constant voltage charging stage. At this time, the implantable medical device will send a periodic charging instruction to the external charger, and the external charger will suspend charging. At this time, the implantable medical device will collect the battery voltage V before suspending charging. 采集 and charging current I 采集 , and the battery voltage after Δt3 time after charging is suspended, according to the voltage difference ΔV' and the charging current I 采集 Calculate the battery internal resistance Ro, and perform linear interpolation calculation based on the battery internal resistance Ri and the battery internal resistance Ro to obtain the battery internal resistance Ri and the battery voltage V during the constant current charging stage. 采集 The corresponding relationship Ri=f(V 采集 ).

[0111] At the same time, the external charger will automatically count down after pausing charging, and will automatically resume charging after t2 time has passed, and will then suspend charging periodically until charging is completed. The relationship in the constant voltage charging stage is mainly calculated based on the periodic suspension. Whenever charging is suspended, the charging current I before the suspension is collected. 采集 The voltage difference ΔV' before and after the charging is suspended for Δt3 is calculated, and then the battery internal resistance Ro is calculated each time the charging is suspended. Finally, the battery internal resistance Ro during several charging suspensions is fitted to obtain the battery internal resistance Ro and charging current I during the constant voltage charging stage. 采集 The corresponding relationship Ro=f(I 采集 ).

[0112] In the actual charging process, step S2, according to the battery voltage V 采集 、Charging current I 采集 The calibration voltage V is calculated based on the battery internal resistance R of the implantable medical device, where the battery internal resistance R is obtained based on the battery internal resistance calibration test and the battery voltage V 采集 and / or charging current I 采集 The corresponding internal resistance value is:

[0113] For the constant current charging stage, according to the battery voltage V 采集 And the corresponding relationship Ri=f(V 采集 ) Determine the battery internal resistance Ri and calculate the calibration voltage V = V 采集 -Icc.Ri.

[0114] In the actual charging process, during the constant current charging stage, the collected battery voltage V 采集 Substitute into the corresponding relationship Ri=f(V 采集 ), the battery internal resistance Ri in the constant current charging stage is obtained, and then the actual battery voltage of the charge is calibrated according to the voltage error caused by the battery internal resistance Ri. By calculating and adjusting the voltage error caused by the battery internal resistance Ri in real time during the constant current charging stage, the accurate battery voltage can be obtained, so that the charging can be accurately controlled and the current power can be accurately displayed.

[0115] For the constant voltage charging stage, according to the charging current I 采集 And the corresponding relationship Ro = f(I 采集 ) Determine the battery internal resistance Ro and calculate the calibration voltage V = Vc-I 采集 ·Ro.

[0116] In the actual charging process, after the charging enters the constant voltage charging stage, the collected charging current I 采集 Substitute into the corresponding relationship Ro = f(I 采集), the battery internal resistance Ro in the constant voltage charging stage is obtained, and then the actual battery voltage of the charge is calibrated according to the voltage error caused by the battery internal resistance Ro. By calculating and adjusting the voltage error caused by the battery internal resistance Ro in real time during the constant current charging stage, a more accurate charging voltage can be obtained, so that the charging can be precisely controlled, the current power can be accurately displayed, overcharging can be avoided, and the battery life can be improved.

[0117] In step S3, the calibration voltage V is determined in real time based on whether it reaches the full charge threshold voltage V full , charging current I 采集 Is it less than or equal to the full charge threshold current I full , it can determine whether it is fully charged and control the charging process in time to avoid overcharging and improve the battery life and safety.

[0118] In the above embodiment, the first calculation method and the third calculation method are applied to calibrate the internal resistance of the battery in the full charging stage. In other embodiments, the second calculation method and the third calculation method can also be combined, which will not be described in detail here.

[0119] 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.

[0120] 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.

[0121] 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 1A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0122] 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. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0123] 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 charging control method for an implantable medical device, characterized in that: include: When the external charger is wirelessly charging the implanted medical device, the charging current I 采集 and battery voltage V 采集 ; According to the battery voltage V 采集 , the charging current I 采集 and the battery internal resistance R of the implantable medical device to calculate the calibration voltage V, wherein the battery internal resistance R is obtained according to the battery internal resistance calibration test and the battery voltage V 采集 and / or charging current I 采集 Corresponding internal resistance value; According to the calibration voltage V and the charging current I 采集 Determine if the implantable medical device is fully charged.

2. The method according to claim 1, characterized in that Before calculating the calibration voltage V, include: For the constant current charging stage, the battery voltage before charging and the battery voltage V during the constant current charging stage are collected. 采集 ; According to the battery voltage before charging and the battery voltage V in the constant current charging stage 采集 Calculate the voltage difference ΔV before and after charging during the constant current charging stage; Calculate the battery internal resistance Ri according to the voltage difference ΔV and the constant current charging current Icc; Monitor whether it enters the constant voltage charging stage; After entering the constant voltage charging stage, charging is suspended and the battery voltage V before charging is suspended is collected. 采集 and charging current I 采集 , and the battery voltage after charging is suspended; Calculate the voltage difference ΔV' before and after the charging is suspended in the constant voltage charging stage according to the battery voltage before and after the charging is suspended; According to the voltage difference ΔV' and the charging current I 采集 Calculate the battery internal resistance Ro; Determine the battery internal resistance Ri and battery voltage V during the constant current charging stage according to the battery internal resistance Ri and battery internal resistance Ro 采集 The corresponding relationship Ri=f(V 采集 ).

3. The method according to claim 1, characterized in that Before calculating the calibration voltage V, include: For the constant current charging stage, the battery voltage before charging and the battery voltage V during the constant current charging stage are collected. 采集 ; According to the battery voltage before charging and the battery voltage V in the constant current charging stage 采集 Calculate the voltage difference ΔV before and after charging during the constant current charging stage; Calculate the battery internal resistance Ri according to the voltage difference ΔV and the constant current charging current Icc; When the external charger performs constant current charging on the implantable medical device, the charging is periodically paused and resumed, and the battery voltage V before and after each charging is collected. 采集 ; The voltage difference ΔV is calculated based on the battery voltage before and after each charging, and the battery internal resistance Ri is calculated based on the constant current charging current Icc; The battery internal resistance Ri and battery voltage V during the constant current charging phase are determined based on the battery internal resistance Ri calculated when charging is resumed after each pause. 采集 The corresponding relationship Ri=f(V 采集 ).

4. The method according to any one of claims 1 to 3, characterized in that Before calculating the calibration voltage V, include: In the constant voltage charging stage, when the external charger is charging the implantable medical device at a constant voltage, the charging is periodically suspended, and the battery voltage V before the charging is suspended is collected. 采集 and charging current I 采集 , and the battery voltage after charging is suspended; The voltage difference ΔV' is calculated based on the battery voltage before and after each charging pause, and the charging current I 采集 Calculate the battery internal resistance Ro; Determine the battery internal resistance Ro and charging current I during the constant voltage charging stage according to the battery internal resistance Ro during each charging pause. 采集 The corresponding relationship Ro=f(I 采集 ).

5. The method according to claim 3, characterized in that: The voltage difference ΔV is calculated based on the battery voltage before and after each charge, and the battery internal resistance Ri is calculated based on the constant current charging current Icc, including: The battery internal resistance Ri1 is calculated using the voltage difference ΔV1 before and after each charging pause and the constant current charging current Icc; The battery internal resistance Ri2 is calculated using the voltage difference ΔV2 before and after each charging start and the constant current charging current Icc; The battery internal resistance Ri is obtained by averaging the battery internal resistance Ri1 and the battery internal resistance Ri2.

6. The method according to claim 4, characterized in that The voltage difference ΔV' is calculated based on the battery voltage before and after each charging pause, and the charging current I 采集 Calculate the battery internal resistance Ro, including: Using the charging current I before stopping charging 采集 , the voltage difference ΔV1' before and after stopping charging, calculate the battery internal resistance Ro1; The voltage difference ΔV2' before and after recovery charging and the charging current I after recovery charging are used. 采集 Calculate the battery internal resistance Ro2; The battery internal resistance Ro is obtained by averaging the battery internal resistance Ro1 and the battery internal resistance Ro2.

7. The method according to claim 2 or 3, characterized in that: According to the battery voltage V 采集 , the charging current I 采集 The calibration voltage V is calculated based on the battery internal resistance R of the implantable medical device, including: During the constant current charging phase, according to the battery voltage V 采集 And the corresponding relationship Ri=f(V 采集 ) Determine the battery internal resistance Ri and calculate the calibration voltage V = V 采集 -Icc·Ri, where Icc is the constant current charging current.

8. The method according to claim 4, characterized in that According to the battery voltage V 采集 , the charging current I 采集 The calibration voltage V is calculated based on the battery internal resistance R of the implantable medical device, including: In the constant voltage charging stage, according to the charging current I 采集 And the corresponding relationship Ro = f(I 采集 ) Determine the battery internal resistance Ro and calculate the calibration voltage V = Vc-I 采集 ·Ro, where Vc is the constant voltage charging voltage.

9. The method according to claim 1, characterized in that: According to the calibration voltage V and the charging current I 采集 Determine whether the implantable medical device is fully charged, including: Determine whether the calibration voltage V reaches the full charge threshold voltage V full , and judge the charging current I 采集 Is it less than or equal to the full charge threshold current I full .

10. An implantable medical device, characterized in that: include: A processor and a memory connected to the processor; wherein the memory stores instructions executable by the processor, and the instructions are executed by the processor so that the processor executes the implantable medical device charging control method as described in any one of claims 1-9.

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