Implanted device wireless power supply control method, in-vitro processing device and system

Abstract

The invention discloses an implanted device wireless power supply control method, an in-vitro processing device and an in-vitro processing system, and belongs to the technical field of biomedicine. Through a sectional type power supply voltage control method, the voltage is gradually increased to the maximum value in a boosting section, and large load impact of a resonance circuit of the in-vitro processing device during starting is relieved; the maximum value of the power supply voltage is gradually reduced to a rated value in the voltage reduction section, large load impact of a resonance circuit of the in-vivo implanted device during starting is relieved, power judgment is carried out in combination with current monitoring of the resonance circuit, transient thermal damage and bioelectricity or electrochemical interference are avoided, and the reliability of the in-vivo implanted device is improved. And high-efficiency and stable electric energy transmission is realized on the premise of ensuring biological safety.

Description

Technical Field

[0001] The present invention belongs to the field of biomedical technology, and more specifically, relates to a wireless power supply control method for an implantable device, an in vitro processing device, and a system. Background Art

[0002] Implantable devices are electronic devices surgically placed in the body for extended periods of time. They are primarily used in the medical or biomedical fields, such as pacemakers, cochlear implants, physiological electrodes, and brain-computer interfaces. These devices must meet stringent biosafety requirements. As technology advances, the functionality of implantable devices becomes more powerful, and power consumption continues to increase. Traditional passive or battery-powered solutions for implantable devices cannot meet these higher power requirements, leading to the emergence of wireless power solutions.

[0003] Commercial wireless power technologies are primarily designed for high-power devices, including mobile phones. Directly applying them to implantable devices results in excessive power, potentially leading to safety concerns and failing to meet biosafety requirements. Existing wireless power solutions for implantable devices lack systemic design considerations for power supply safety, particularly during startup, when the large load impulses generated by the LC resonant circuit can cause transient thermal damage and bioelectrical or electrochemical interference. As implantable medical devices continue to miniaturize, achieving efficient power transmission while ensuring biosafety has become a bottleneck restricting technological development. Summary of the Invention

[0004] In response to the above-mentioned defects or improvement needs of the prior art, the present invention provides a wireless power supply control method for an implantable device, an in vitro processing device, and a system. The purpose is to control the voltage of the resonant circuit of the in vitro processing device to gradually increase to reduce the large load impact occurring during the resonance establishment process, and gradually reduce it from the maximum value to the rated value to reduce the load impact at the start-up of the implantable device load, and combine current monitoring to avoid transient thermal damage and ensure biosafety, thereby solving the technical problem of biosafety risks in the existing wireless power supply technology for implantable devices.

[0005] To achieve the above object, according to one aspect of the present invention, a method for controlling wireless power supply of an implantable device is provided, comprising the following steps: After receiving the power-on instruction, gradually increase the supply voltage of the first resonant circuit to the maximum voltage value and maintain it for a preset time, and then gradually reduce the supply voltage of the first resonant circuit to the rated voltage value; Maintaining the supply voltage of the first resonant circuit at a rated voltage value and supplying power to the second resonant circuit; After receiving the power-off instruction, the first resonant circuit is disabled and the first power conversion circuit setting is reset.

[0006] Preferably, before receiving the power-off instruction, the wireless power supply control method for the implant device further includes: monitoring the current value of the first resonant circuit, and if it is determined that the load state is overcurrent or undercurrent, disabling the first resonant circuit and resetting the first power conversion circuit setting.

[0007] Preferably, the monitoring of the current value of the first resonant circuit specifically includes: monitoring the current during the stage of gradually increasing the supply voltage of the first resonant circuit after receiving the power-on instruction to determine the load state; and During the period of maintaining the power supply voltage of the first resonant circuit at the maximum voltage value for a preset period of time, the current is monitored to determine the load state; and During the step of gradually reducing the supply voltage of the first resonant circuit to the rated voltage value and maintaining the supply voltage of the first resonant circuit at the rated voltage value, the current is monitored to determine the load state.

[0008] Preferably, the method further comprises: in the stage of gradually increasing the supply voltage of the first resonant circuit after receiving the power-on instruction, when the current value of the first resonant circuit is monitored to be 1.5 times or more of the maximum rated current, determining that the load state is overcurrent; During the period of maintaining the supply voltage of the first resonant circuit at the maximum voltage value for a preset time, when the current value of the first resonant circuit is monitored to be 1.2 times or more of the maximum rated current, the load state is determined to be overcurrent; In the step of gradually reducing the supply voltage of the first resonant circuit to the rated voltage value and maintaining the supply voltage of the first resonant circuit at the rated voltage value, when the current value of the first resonant circuit is monitored to be 1.1 times or more of the maximum rated current, the load state is judged to be overcurrent; when the current value of the first resonant circuit is monitored to be 0.9 times or less of the minimum rated current, the load state is judged to be undercurrent.

[0009] Preferably, the method also includes: gradually increasing the supply voltage of the first resonant circuit after receiving the power-on command, which means increasing it to the maximum voltage value within 500ms; the maximum voltage value is 1.2 to 1.5 times the rated voltage value; maintaining the maximum value for a preset time so that the current value of the first resonant circuit tends to stabilize.

[0010] Preferably, the method further comprises the following steps: When the hardware protection circuit detects that the current value of the first resonant circuit exceeds the hardware protection threshold for a preset time period, the output of the first power conversion circuit is locked to cut off the power supply of the first resonant circuit until the system is powered off.

[0011] According to another aspect of the present invention, there is provided an in vitro processing device for an implantable device, comprising a first resonant circuit, a first power conversion circuit, a current sensing circuit, and an MCU control circuit; The signal input terminal of the MCU control circuit is connected to the instruction, which generates an output voltage control signal and an enable signal. The output voltage control signal is connected to the first power conversion circuit, and the enable signal is connected to the first resonant circuit. The current sensing circuit is arranged between the first power conversion circuit and the first resonant circuit, and its output voltage signal is connected to the MCU control circuit; The first power conversion circuit is used to convert the power supply voltage into a supply voltage that complies with the boost curve according to the output voltage control signal during startup and provide the supply voltage to the first resonant circuit; The current sensing circuit is used to detect the first resonant circuit current and output a voltage signal representing the magnitude of the current; The MCU control circuit is used to receive instructions, determine the load state according to the output voltage signal of the current sensing circuit, and output a voltage control signal and an enable signal according to the instructions and the load state; The first resonant circuit includes a transmitting coil, which is used to wirelessly power the second resonant circuit according to an enable signal under the drive of the first power conversion circuit.

[0012] Preferably, the implantable device in vitro processing device further comprises: an energy storage circuit provided between the power supply and the first power conversion circuit; The energy storage circuit is used to stabilize the input voltage of the first power conversion circuit and resist the instantaneous load impulse when resonance is established.

[0013] Preferably, the current sensing circuit includes a sampling resistor and a differential amplifier.

[0014] Preferably, the implant device in vitro processing device further comprises a hardware protection circuit; The hardware protection circuit is connected to the output voltage signal of the current sensing circuit and is connected to the control end of the main power switch. When it is detected that the voltage signal output by the current sensing circuit exceeds its protection threshold for a preset time period, it is used to lock the output of the first power conversion circuit to cut off the power supply of the first resonant circuit; the hardware protection circuit includes a voltage divider circuit for adjusting the protection threshold and a resistor network for adjusting the preset time period.

[0015] According to another aspect of the present invention, an implantation system is provided, comprising an external machine and an implantation device, wherein the external machine comprises the external processing device of the implantation device provided by the present invention, and the implantation device has a wireless receiving end.

[0016] Preferably, the wireless receiving end includes a second resonant circuit, a rectifier circuit, and a second power conversion circuit; The second resonant circuit includes a receiving coil, and the power supply is connected to the second power conversion circuit after passing through the second resonant circuit and the rectifier circuit; The second power conversion circuit includes an input DCDC chip with a wide input voltage range, which is used to provide a basic power rail.

[0017] Preferably, the second power conversion circuit adopts multi-stage voltage conversion and further includes a low voltage dropout linear regulator for converting a basic power rail into other power rails required by the load.

[0018] Preferably, the wireless receiving end also includes a voltage detection circuit; the voltage detection circuit is connected in parallel with the second power conversion circuit, and the voltage detection circuit includes a voltage divider circuit and an MCU voltage monitoring circuit, and the voltage divider circuit connects the detected power supply voltage signal to the MCU voltage monitoring circuit.

[0019] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art: The wireless power supply control method for implantable devices, the in vitro processing device, and the system provided by the present invention use a segmented power supply voltage control method to gradually increase the voltage to the maximum value in the boost section, thereby alleviating the large load impact on the resonant circuit of the in vitro processing device during startup. In the step-down section, the power supply voltage is gradually reduced from the maximum value to the rated value, thereby alleviating the large load impact on the resonant circuit of the in vivo implantable device during startup. Power judgment is performed in combination with current monitoring of the resonant circuit, thereby avoiding transient thermal damage and bioelectric or electrochemical interference, thereby achieving efficient and stable power transmission while ensuring biosafety. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a circuit diagram of an in vitro processing device for an implant device of an implant system provided by the present invention; Figure 2 This is a schematic diagram of a wireless receiving end circuit of an implant device of the implant system provided by the present invention; Figure 3 This is a circuit diagram of an in vitro processing device for an implant device of an implant system provided by an embodiment of the present invention; Figure 4 is a circuit structure diagram of an energy storage circuit of an in vitro treatment device provided by an embodiment of the present invention; Figure 5 The figure is a circuit diagram of a wireless receiving end of an implant device of an implant system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0021] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0022] The present invention provides a method for controlling wireless power supply of an implantable device, comprising the following steps: Startup: After receiving the power-on command, the supply voltage of the first resonant circuit is gradually increased to the maximum voltage value and maintained for a preset time, and then the supply voltage of the first resonant circuit is gradually reduced to the rated voltage value; during this period, the current of the first resonant circuit is monitored to determine the load status: Specifically, the first resonant circuit includes a transmitting coil; After receiving the power-on command, the supply voltage of the first resonant circuit is gradually increased, and its current is monitored to determine the load status; specifically, when the current value of the first resonant circuit is monitored to be 1.5 times or more of the rated maximum current, the load status is determined to be overcurrent; Maintaining the supply voltage of the first resonant circuit at its maximum voltage for a preset period of time and monitoring its current to determine the load state; specifically, when the monitored current value of the first resonant circuit is 1.2 times or more of the rated maximum current, determining that the load state is overcurrent; The supply voltage of the first resonant circuit is gradually reduced to the rated voltage value, and its current is monitored to determine the load status; specifically, when the current value of the first resonant circuit is monitored to be 1.1 times or more of the maximum rated current, the load status is determined to be overcurrent; when the current value of the first resonant circuit is monitored to be 0.9 times or less of the minimum rated current, the load status is determined to be undercurrent; when the current value of the first resonant circuit is monitored to be within the preset power-on current range, the load is determined to be normal, and a power-on success is reported; When it is determined that the load state is overcurrent or undercurrent, an abnormality handling step is performed.

[0023] Preferably, the supply voltage of the first resonant circuit is increased to a maximum voltage value within 500ms; the maximum voltage value is 1.2 to 1.5 times the rated voltage value; and the maximum value is maintained for a preset time to stabilize the current value of the first resonant circuit.

[0024] In this embodiment, soft-start is achieved by gradually increasing the supply voltage of the first resonant circuit during the startup process. This can reduce the impact of large load impulses during the LC resonance establishment process. Furthermore, increasing the supply voltage of the first resonant circuit to its maximum value and maintaining it for a period of time ensures that the implanted device can withstand the load impulses caused by load startup and relatively stably establish coupled power supply from the first resonant circuit to the second resonant circuit. Simultaneously, real-time detection of the current in the first resonant circuit implements overcurrent protection, undercurrent protection, and metal detection protection. Only when the current remains within the normal range is the correct load detected and the voltage output is gradually increased. If undercurrent or overcurrent is detected, wireless power supply is terminated to prevent further damage caused by the load fault. Furthermore, if an abnormal metal object is detected, the first resonant circuit terminates wireless power supply, thereby preventing damage due to overcurrent. Each power establishment process ensures circuit safety of the implanted device through power-controlled soft-start.

[0025] Normal operation: Maintain the power supply voltage of the first resonant circuit at the rated voltage value, supply power to the second resonant circuit, and monitor the current of the first resonant circuit during this period to determine the load status; specifically: when the current value of the first resonant circuit is monitored to be 1.1 times or more of the maximum rated current, the load status is determined to be overcurrent; when the current value of the first resonant circuit is monitored to be 0.9 times or less of the minimum rated current, the load status is determined to be undercurrent; when the load status is determined to be overcurrent or undercurrent, perform the abnormal handling steps.

[0026] The rated current range of this embodiment is generally 15 to 35 mA.

[0027] Power off: After receiving the power off command, the first resonant circuit is disabled, the first power conversion circuit settings are reset, and then the power off success is reported; Exception handling: Report power-on failure or power supply abnormality, disable the first resonant circuit and reset the first power conversion circuit setting; specifically, when the load status is judged to be overcurrent or undercurrent during the startup phase, report power-on failure; when the load status is judged to be overcurrent or undercurrent during the normal operation phase, report power supply abnormality.

[0028] Hardware protection: When the hardware protection circuit detects that the load current exceeds the hardware protection threshold for a preset period of time and the MCU control circuit does not correctly handle the overcurrent anomaly, the output of the first power conversion circuit is locked to cut off the power supply of the first resonant circuit until the system is powered off.

[0029] The embodiment of the present invention uses a segmented power supply voltage control method to gradually increase the voltage to the maximum value in the boost section to alleviate the large load impact of the first resonant circuit during startup. In the step-down section, the power supply voltage is gradually reduced from the maximum value to the rated value to alleviate the large load impact of the second resonant circuit of the implanted device in the body during startup. The power judgment is performed in combination with the current monitoring of the first resonant circuit to avoid transient thermal damage and bioelectric or electrochemical interference, thereby achieving efficient and stable power transmission while ensuring biosafety.

[0030] The in vitro treatment device for implantable devices provided by the present invention is as follows: Figure 1 As shown, it includes a first resonant circuit, a first power conversion circuit, a current sensing circuit and an MCU control circuit; The signal input terminal of the MCU control circuit is connected to the instruction, which generates an output voltage control signal and an enable signal. The output voltage control signal is connected to the first power conversion circuit, and the enable signal is connected to the first resonant circuit. The current sensing circuit is arranged between the first power conversion circuit and the first resonant circuit, and its output voltage signal is connected to the MCU control circuit; The preferred solution further includes providing an energy storage circuit between the power supply and the first power conversion circuit; The preferred solution further includes a hardware protection circuit; the hardware protection circuit is connected to the output voltage signal of the current sensing circuit and is connected to the control end of the main power switch.

[0031] in: The first power conversion circuit preferably uses a DCDC chip with programmable output voltage, which is used to convert the power voltage into a supply voltage that meets the boost curve according to the output voltage control signal during startup and provide it to the first resonant circuit; The current sensing circuit includes a sampling resistor and a differential amplifier, and is used to detect the first resonant circuit current and output a voltage signal representing the magnitude of the current.

[0032] The MCU control circuit is used to receive instructions, determine the load status based on the output voltage signal of the current sensing circuit, and generate an output voltage control signal and an enable signal based on the instructions and the load status; the MCU control circuit can also complete the recording of the operating status and key events of the system according to actual needs; The first resonant circuit includes a transmitting coil, which is used to wirelessly power the second resonant circuit according to an enable signal under the drive of the first power conversion circuit.

[0033] The energy storage circuit includes a capacitor and a Schottky diode, which is used to stabilize the input voltage of the first power conversion circuit and resist instantaneous load impulse when resonance is established.

[0034] The hardware protection circuit is connected to the output voltage signal of the current sensing circuit and is connected to the control end of the main power switch. When it is detected that the voltage signal output by the current sensing circuit exceeds its protection threshold for a preset time period and the MCU control circuit does not correctly handle the overcurrent anomaly, it locks the output of the first power conversion circuit to cut off the power supply of the first resonant circuit; specifically, the hardware protection circuit includes a voltage divider circuit for adjusting the protection threshold and a resistor network for adjusting the preset time period.

[0035] The implantation system provided by the present invention comprises an external machine and an implantation device, wherein the external machine comprises an external processing device for the implantation device provided by the present invention, and the implantation device has a wireless receiving end.

[0036] The wireless receiving end, such as Figure 2 As shown, it includes a second resonant circuit, a rectifier circuit, and a second power conversion circuit; the power supply is connected to the second power conversion circuit after passing through the second resonant circuit and the rectifier circuit; The second power conversion circuit includes an input DC-DC chip with a wide input voltage range to provide a base power rail. Preferably, the second power conversion circuit employs multi-stage voltage conversion and also includes a low-dropout linear regulator (LDO) and / or a DC-DC chip to convert the base power rail into additional power rails required by the load. The wide input voltage of the first resonant circuit maximizes the power supply range and reduces the impact of large load impulses on the implanted body caused by the establishment of resonant coupling between the first and second resonant circuits. Accordingly, the wireless receiver utilizes a low-power-rated input transformer DC-DC chip to ensure normal operation despite significant variations in distance from the external processing device and maintain high power efficiency. The input voltage range of the transformer DC-DC chip is 4.5-45V, preferably 4.5-20V.

[0037] Preferably, the wireless receiving end also includes a voltage detection circuit, which is connected in parallel with the second power conversion circuit. The voltage detection circuit includes a voltage divider circuit and an MCU voltage monitoring circuit, and the voltage divider circuit connects the detected power supply voltage signal to the MCU voltage monitoring circuit.

[0038] The following are examples: The implant system provided in this embodiment is a wireless computer-powered interface, including an external machine and an implanted device. The implanted device is an implantable brain-computer interface. The external machine includes an external processing device of the implanted device, which is used to use high-frequency alternating current of about 500kHz to power the implantable brain-computer interface.

[0039] Extracorporeal treatment device, structure such as Figure 3As shown, it includes a first resonant circuit, a first power conversion circuit, a current sensing circuit, a main power switch (power MOS tube), an MCU control circuit, an energy storage circuit and a hardware protection circuit; The signal input terminal of the MCU control circuit receives instructions through the control interface, generating an output voltage control signal and an enable signal. The output voltage control signal is connected to the first power conversion circuit, and the enable signal is connected to the first resonant circuit. The current sensing circuit is arranged between the first power conversion circuit and the first resonant circuit, and its output voltage signal is connected to the MCU control circuit; the energy storage circuit is connected between the power supply and the first power conversion circuit. The hardware protection circuit receives the output voltage signal of the current sensing circuit and is connected to the control terminal of the main power switch.

[0040] A first power conversion circuit, using a DCDC chip with programmable output voltage, is used to convert the power voltage into a supply voltage that complies with the boost curve according to the output voltage control signal during startup and provide it to the first resonant circuit; The current sensing circuit includes a sampling resistor and a differential amplifier, and adopts an analog current sensor to detect the current of the first resonant circuit and output a voltage signal representing the magnitude of the current.

[0041] In this embodiment, real-time monitoring of the first resonant circuit current provides overcurrent, undercurrent, and metal detection protection. Only when the current remains within the normal range is the correct load detected and the voltage output gradually increased, gradually increasing the voltage-current ratio. If undercurrent or overcurrent is detected, wireless power supply is terminated to prevent further damage caused by the load failure. If an abnormal metal object is detected, the first resonant circuit terminates wireless power supply, preventing damage from overcurrent. Each power supply establishment process uses a power-controlled soft start to ensure circuit safety for the implanted device.

[0042] The MCU control circuit is used to receive instructions, determine the load status based on the output voltage signal of the current sensing circuit, and generate an output voltage control signal and an enable signal based on the instructions and the load status. The MCU control circuit can also be used to complete the recording of the operating status and key events of the system according to actual needs; The first resonant circuit is configured to wirelessly power the second resonant circuit under the drive of the first power conversion circuit and in accordance with an enable signal. Specifically, in this embodiment, the current of the first resonant circuit during normal operation is 15-20 mA @ 8-10 V (no-load) and 25-35 mA @ 8-10 V (operating), with an instantaneous current of up to 80 mA. The rated voltage of the first resonant circuit is 9 V, and the rated current is 30 mA. (The first resonant circuit allows an input voltage of 5-18 V, generally 7-10 V in application, and 10-12 V during startup, i.e., the maximum voltage is 10-12 V.) Energy storage circuits, such as Figure 4 As shown, the first power conversion circuit includes a capacitor and a Schottky diode to stabilize the input voltage of the first power conversion circuit and resist the instantaneous load impulse when the resonance is established. Without the energy storage circuit, the power at the start-up moment is too high, and the first resonant circuit will cause a large load impulse to the power supply.

[0043] The hardware protection circuit receives the output voltage signal of the current sensing circuit and is connected to the control terminal of the main power switch. When the voltage signal output by the current sensing circuit exceeds its protection threshold for a preset duration and the MCU control circuit fails to properly handle the overcurrent anomaly, it locks the output of the first power conversion circuit to cut off the power supply to the first resonant circuit. The hardware protection circuit includes a voltage divider circuit for adjusting the protection threshold and a resistor network for adjusting the preset duration. When the MCU control circuit fails to trigger the overcurrent protection normally due to an anomaly, the hardware protection circuit forcibly locks the wireless power supply, and the system can only be restored after power is disconnected, ensuring the safety of the system after a fault occurs. In this embodiment, the protection threshold of the hardware protection circuit is 1.25 times the maximum rated current, and the preset duration is 0.2s. That is, when the signal collected by the current sensing circuit indicates that the current of the first resonant circuit reaches 37.5mA and lasts for more than 0.2s, it is determined to be an overcurrent, and the output of the first power conversion circuit is locked to cut off the power supply to the first resonant circuit.

[0044] Wireless receiver, such as Figure 5 As shown, it includes a second resonant circuit, a rectifier circuit, a second power conversion circuit and a voltage detection circuit; the power supply is connected to the second power conversion circuit after passing through the second resonant circuit and the rectifier circuit; the voltage detection circuit is connected in parallel with the second power conversion circuit; The second power conversion circuit includes a wide-input voltage range input DC-DC chip to provide the base power rail, utilizing multi-stage voltage conversion. It also includes a low-dropout linear regulator (LDO) chip to convert the base power rail into the additional power rails required by the load. The DC-DC chip's nominal input voltage range is 4.5-45V. This wide input voltage range ensures the implanted device operates normally despite significant variations in distance from the external processing device, while maintaining high power efficiency.

[0045] The basic power rail of the wireless receiver is output by the DCDC chip, ensuring high energy conversion efficiency; the extended power rail is output by a low-dropout linear regulator (LDO). The LDO has a high startup speed and can still ensure a reasonable power-on timing in the case of power cascade, ensuring the normal startup of subsequent loads.

[0046] The voltage detection circuit includes a voltage divider circuit and an MCU voltage monitoring circuit. The voltage divider circuit connects the detected power supply voltage signal to the MCU voltage monitoring circuit. The MCU voltage monitoring circuit also performs current monitoring. If there is overcurrent or undercurrent, the MCU voltage monitoring circuit will send the abnormal current signal to the MCU control circuit of the extracorporeal processing device through wireless communication. The MCU control circuit of the extracorporeal processing device reports a power-on failure, disables the first resonant circuit, and resets the first power conversion circuit setting.

[0047] Since the wireless receiving circuit of the implanted device is a purely passive design, the system's wireless power-up, power-down, and power-down processes are controlled by the implanted device's external processing device. The specific methods are as follows: start up: S1. After the system is started and a power-on command is received, the MCU control circuit of the in vitro processing device of the implanted device generates an output voltage control signal and an enable signal. The output voltage control signal is connected to the first power conversion circuit, and the enable signal is connected to the first resonant circuit. S2. The first power conversion circuit gradually increases the voltage of the first resonant circuit to the maximum value. During this process, the MCU control circuit monitors whether the input current of the first power conversion circuit is overcurrent through the current sensing circuit. If so, jump to S5.

[0048] Specifically, in this embodiment, the maximum voltage is 12V, and the voltage needs to be gradually increased to 12V within 500ms. If the current is detected to be 1.5 times or more of the rated current maximum value during the process of increasing the voltage to 12V, it is judged as overcurrent; the rated current of this embodiment is 30mA, that is, in this process, when the current exceeds 45mA, it is judged as overcurrent.

[0049] S3. The first power conversion circuit maintains the voltage of the first resonant circuit at the highest value for a certain period of time. During this process, the MCU control circuit monitors whether the input current of the first power conversion circuit is overcurrent through the current sensing circuit. If so, jump to S5.

[0050] Specifically, this embodiment maintains the voltage of the first resonant circuit at 12V until its current value tends to stabilize. During this process, the MCU control circuit monitors whether the input current of the first power conversion circuit is overcurrent through the current sensing circuit. If the current exceeds 1.2 times or more of the maximum rated current, it is judged as overcurrent. That is, the rated current of this embodiment is 30mA, and when the current exceeds 36mA, it is judged as overcurrent.

[0051] S4. The first power conversion circuit gradually reduces the voltage of the first resonant circuit to a rated value. During this process, the MCU control circuit monitors the input current of the first power conversion circuit through the current sensing circuit to determine whether there is overcurrent or undercurrent. If so, the process jumps to S5. If not, the process reports that power-on is successful. The voltage rating in this embodiment is 9V; during this process, the MCU control circuit monitors the input current of the first power conversion circuit from the current sensing circuit. If the current exceeds 1.1 times or more of the maximum rated current, it is judged as overcurrent; if the current is lower than 0.9 times or less of the maximum rated current, it is judged as undercurrent; that is, the rated current in this embodiment is 30mA, when the current exceeds 33mA, it is judged as overcurrent, and when the current is lower than 27mA, it is judged as undercurrent.

[0052] Exception handling: S5, the MCU control circuit reports a power-on failure, disables the first resonant circuit, and resets the settings of the first power conversion circuit; Normal operation: S6. Maintain the power supply voltage of the first resonant circuit at the rated voltage value; at the same time, during this process, the MCU control circuit monitors whether the input current of the first power conversion circuit is overcurrent or undercurrent through the current sensing circuit. If overcurrent or undercurrent exists, the power supply abnormality is reported, the first resonant circuit is disabled, and the settings of the first power conversion circuit are reset; In this embodiment, the MCU control circuit monitors the input current of the first power conversion circuit from the current sensing circuit. If the current exceeds 1.1 times or more of the maximum rated current, it is judged as overcurrent; if the current is lower than 0.9 times or less of the maximum rated current, it is judged as undercurrent; that is, the rated current of this embodiment is 30mA, when the current exceeds 33mA, it is judged as overcurrent, and when the current is lower than 27mA, it is judged as undercurrent.

[0053] Power off: S7: After receiving the power-off instruction, the first resonant circuit is disabled, the first power conversion circuit is reset, and then the power-off success is reported; Hardware protection: During or after power-on, the hardware protection circuit detects overcurrent in real time. If overcurrent persists for a certain period of time, indicating that S5 or S6 has not properly addressed the abnormality, the output of the first power conversion circuit is locked to cut off power to the first resonant circuit. The system recovers after powering off. The protection threshold of the hardware protection circuit in this embodiment is 1.25 times the maximum rated current, and the preset duration is 0.2s. That is, when the signal collected by the current sensing circuit indicates that the current in the first resonant circuit reaches 37.5mA and lasts for more than 0.2s, it is determined to be overcurrent, and the output of the first power conversion circuit is locked to cut off power to the first resonant circuit.

[0054] It will be easily understood by those skilled in the art that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A wireless power supply control method for an implantable device, characterized in that: The following steps are involved: After receiving the power-on instruction, gradually increase the supply voltage of the first resonant circuit to the maximum voltage value and maintain it for a preset time, and then gradually reduce the supply voltage of the first resonant circuit to the rated voltage value; Maintaining the supply voltage of the first resonant circuit at a rated voltage value and supplying power to the second resonant circuit; After receiving the power-off instruction, the first resonant circuit is disabled and the first power conversion circuit setting is reset.

2. The wireless power supply control method for an implant device according to claim 1, wherein: Before receiving the power-off instruction, the method further includes: monitoring the current value of the first resonant circuit, and if it is determined that the load state is overcurrent or undercurrent, disabling the first resonant circuit and resetting the first power conversion circuit setting.

3. The wireless power supply control method for an implant device according to claim 2, wherein: The monitoring of the current value of the first resonant circuit specifically includes: monitoring the current during the stage of gradually increasing the supply voltage of the first resonant circuit after receiving the power-on instruction to determine the load state; and During the period of maintaining the power supply voltage of the first resonant circuit at the maximum voltage value for a preset period of time, the current is monitored to determine the load state; and When the supply voltage of the first resonant circuit is gradually reduced to the rated voltage value, and when the supply voltage of the first resonant circuit is maintained at the rated voltage value, the current is monitored to determine the load state.

4. The wireless power supply control method for an implant device according to claim 3, wherein: The method further includes: in the stage of gradually increasing the supply voltage of the first resonant circuit after receiving the power-on instruction, when the current value of the first resonant circuit is monitored to be 1.5 times or more of the rated current maximum value, determining that the load state is overcurrent; During the period of maintaining the supply voltage of the first resonant circuit at the maximum voltage value for a preset time, when the current value of the first resonant circuit is monitored to be 1.2 times or more of the maximum rated current, the load state is determined to be overcurrent; In the step of gradually reducing the supply voltage of the first resonant circuit to the rated voltage value and maintaining the supply voltage of the first resonant circuit at the rated voltage value, when the current value of the first resonant circuit is monitored to be 1.1 times or more of the maximum rated current, the load state is judged to be overcurrent; when the current value of the first resonant circuit is monitored to be 0.9 times or less of the minimum rated current, the load state is judged to be undercurrent.

5. The wireless power supply control method for an implant device according to claim 2, wherein: The following steps are also included: When the hardware protection circuit detects that the current value of the first resonant circuit exceeds the hardware protection threshold for a preset time period, the output of the first power conversion circuit is locked to cut off the power supply of the first resonant circuit until the system is powered off.

6. An in vitro treatment device for an implantable device, characterized in that: The wireless power supply control method for an implantable device according to any one of claims 1 to 5 is applied, comprising a first resonant circuit, a first power conversion circuit, a current sensing circuit, and an MCU control circuit; The signal input terminal of the MCU control circuit is connected to the instruction, which generates an output voltage control signal and an enable signal. The output voltage control signal is connected to the first power conversion circuit, and the enable signal is connected to the first resonant circuit. The current sensing circuit is arranged between the first power conversion circuit and the first resonant circuit, and its output voltage signal is connected to the MCU control circuit; The first power conversion circuit is used to convert the power supply voltage into a supply voltage that complies with the boost curve according to the output voltage control signal during startup and provide the supply voltage to the first resonant circuit; The current sensing circuit is used to detect the first resonant circuit current and output a voltage signal representing the magnitude of the current; The MCU control circuit is used to receive instructions, determine the load state according to the output voltage signal of the current sensing circuit, and output a voltage control signal and an enable signal according to the instructions and the load state; The first resonant circuit includes a transmitting coil, which is used to wirelessly power the second resonant circuit according to an enable signal under the drive of the first power conversion circuit.

7. The in vitro treatment device for an implantable device according to claim 6, wherein: It also includes an energy storage circuit provided between the power supply and the first power conversion circuit; The energy storage circuit is used to stabilize the input voltage of the first power conversion circuit and resist the instantaneous load impulse when resonance is established.

8. The in vitro treatment device for an implantable device according to claim 6, wherein: The current sensing circuit includes a sampling resistor and a differential amplifier.

9. The in vitro treatment device for an implantable device according to claim 6, wherein: Also includes hardware protection circuitry; The hardware protection circuit is connected to the output voltage signal of the current sensing circuit and is connected to the control end of the main power switch. When it is detected that the voltage signal output by the current sensing circuit exceeds its protection threshold for a preset time period, it is used to lock the output of the first power conversion circuit to cut off the power supply of the first resonant circuit; the hardware protection circuit includes a voltage divider circuit for adjusting the protection threshold and a resistor network for adjusting the preset time period.

10. An implant system, characterized in that: It comprises an external machine and an implant device, wherein the external machine comprises the external processing device of the implant device according to any one of claims 6 to 9, and the implant device has a wireless receiving end.

11. The implant system according to claim 10, wherein: The wireless receiving end includes a second resonant circuit, a rectifier circuit, and a second power conversion circuit; The second resonant circuit includes a receiving coil, and the power supply is connected to the second power conversion circuit after passing through the second resonant circuit and the rectifier circuit; The second power conversion circuit includes an input DCDC chip with a wide input voltage range, which is used to provide a basic power rail.

12. The implant system according to claim 11, wherein The second power conversion circuit adopts multi-stage voltage conversion and also includes a low voltage dropout linear regulator for converting a basic power rail into other power rails required by the load.

13. The implant system according to claim 11, wherein The wireless receiving end also includes a voltage detection circuit; the voltage detection circuit is connected in parallel with the second power conversion circuit, and the voltage detection circuit includes a voltage divider circuit and an MCU voltage monitoring circuit, and the voltage divider circuit connects the detected power supply voltage signal to the MCU voltage monitoring circuit.

Images