A method for wireless power control of an implanted device, extracorporeal treatment device, system

Abstract

The application discloses a kind of implanted device wireless power supply control method, extracorporeal treatment device, system, belong to biomedical technical field.The application is gradually boosted to maximum value in boost section by segmented power supply voltage control method, relieve the resonance loop of extracorporeal treatment device when starting appears big load impact;In the step-down section, gradually reduce from the maximum value of power supply voltage to rated value, relieve the resonance loop of implanted device in the body when starting appears big load impact, and power is judged in combination with the current monitoring of resonance loop, avoid transient thermal injury and bioelectric or electrochemical interference, realize efficient and stable power transmission under the premise of guaranteeing biological safety.

Description

Technical Field

[0001] This invention belongs to the field of biomedical technology, and more specifically, relates to a wireless power supply control method, an external processing device, and a system for implantable devices. Background Technology

[0002] Implantable devices are electronic devices that are surgically placed permanently inside the body, 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. With technological advancements, implantable devices have become more powerful, leading to increased power consumption. Traditional passive or battery-powered solutions for implantable devices can no longer meet these higher power consumption demands, giving rise to wireless power supply solutions.

[0003] Commercial wireless power supply technologies are mostly designed for high-power devices, including mobile phones. Direct application to implantable devices with excessively high power can easily lead to safety issues and fail to meet biosafety requirements. Existing wireless power supply solutions for implantable devices lack system design for power supply safety, especially regarding the large load impulse generated by the LC resonant circuit during startup, which may cause transient thermal damage and bioelectrical or electrochemical interference. As implantable medical devices become increasingly miniaturized, achieving efficient power transmission while ensuring biosafety has become a bottleneck restricting technological development. Summary of the Invention

[0004] To address the aforementioned deficiencies or improvement needs of existing technologies, this invention provides a wireless power supply control method, an external processing device, and a system for implantable devices. The purpose is to reduce the large load impact during the resonance establishment process by gradually increasing the voltage of the resonant circuit of the external processing device, and gradually decreasing it from its highest value to its rated value to reduce the load impact during the load startup of the implantable device. Furthermore, current monitoring is used to avoid transient thermal damage and ensure biosafety. This solves the biosafety risk problem inherent in existing wireless power supply technologies for implantable devices.

[0005] To achieve the above objectives, according to one aspect of the present invention, a wireless power supply control method for an implantable device is provided, comprising the following steps:

[0006] Upon receiving the power-on command, the supply voltage of the first resonant circuit is gradually increased to the highest voltage value and maintained for a preset time. Then, the supply voltage of the first resonant circuit is gradually reduced to the rated voltage value.

[0007] Maintain the supply voltage of the first resonant circuit at the rated voltage value, and supply power to the second resonant circuit;

[0008] Upon receiving the power-down command, the first resonant circuit is deenabled, and the settings of the first power conversion circuit are reset.

[0009] Preferably, before receiving the power-down command, the wireless power supply control method for the implanted device further includes: monitoring the current value of the first resonant circuit; if it is determined that the load state is overcurrent or undercurrent, then the first resonant circuit is deenabled and the settings of the first power conversion circuit are reset.

[0010] Preferably, monitoring the current value of the first resonant circuit specifically includes: monitoring the current of the first resonant circuit during the phase of gradually increasing the supply voltage of the first resonant circuit after receiving the power-on command, and determining the load status; and,

[0011] The current is monitored during the preset duration period when the supply voltage of the first resonant circuit is at its highest value to determine the load status; and

[0012] During the process 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 status.

[0013] Preferably, the method further includes: during the stage of gradually increasing the power supply voltage of the first resonant circuit after receiving the power-on command, when the current value of the first resonant circuit is detected to be 1.5 times or more of the maximum rated current, the load condition is determined to be overcurrent.

[0014] During the preset time period of maintaining the power supply voltage of the first resonant circuit at the highest voltage value, if the current value of the first resonant circuit is detected to be 1.2 times or more of the maximum rated current, the load condition is determined to be overcurrent.

[0015] The process 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 stage, when the current value of the first resonant circuit is detected to be 1.1 times or more of the maximum rated current, the load condition is determined to be overcurrent; when the current value of the first resonant circuit is detected to be 0.9 times or less of the minimum rated current, the load condition is determined to be undercurrent.

[0016] Preferably, the method further includes: gradually increasing the supply voltage of the first resonant circuit after receiving the power-on command means increasing it to the highest voltage value within 500ms; the highest voltage value is 1.2 to 1.5 times the rated voltage value; maintaining the highest value for a preset time so that the current value of the first resonant circuit tends to stabilize.

[0017] Preferably, the method further includes the following steps:

[0018] When the hardware protection circuit detects that the current value of the first resonant circuit exceeds the hardware protection threshold for a preset duration, it locks the output of the first power conversion circuit to cut off the power supply to the first resonant circuit until the system is powered down.

[0019] According to another aspect of the present invention, an external processing device for an implantable device is provided, including a first resonant circuit, a first power conversion circuit, a current sensing circuit, and an MCU control circuit.

[0020] The MCU control circuit receives instructions at its signal input terminal, 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 located between the first power conversion circuit and the first resonant circuit, and its output voltage signal is connected to the MCU control circuit.

[0021] The first power conversion circuit is used during startup to convert the power supply voltage into a supply voltage that conforms to the boost curve according to the output voltage control signal and supply it to the first resonant circuit.

[0022] The current sensing circuit is used to detect the current in the first resonant circuit and output a voltage signal characterizing its magnitude.

[0023] 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 output voltage control signals and enable signals according to the instructions and the load status.

[0024] 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.

[0025] Preferably, the implantable device external processing unit further includes: an energy storage circuit provided between the power supply and the first power conversion circuit;

[0026] The energy storage circuit is used to stabilize the input voltage of the first power conversion circuit and resist the instantaneous load surge when resonance is established.

[0027] Preferably, the current sensing circuit includes a sampling resistor and a differential amplifier.

[0028] Preferably, the external processing device for the implanted device further includes a hardware protection circuit;

[0029] The hardware protection circuit is connected to the output voltage signal of the current sensing circuit and 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, the circuit 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.

[0030] According to another aspect of the present invention, an implantation system is provided, comprising an external unit and an implantation device, wherein the external unit includes an external processing device for the implantation device provided by the present invention, and the implantation device has a wireless receiving end.

[0031] Preferably, the wireless receiver includes a second resonant circuit, a rectifier circuit, and a second power conversion circuit;

[0032] 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;

[0033] The second power conversion circuit includes an input DC-DC chip with a wide input voltage range for providing a base power rail.

[0034] Preferably, the second power conversion circuit employs multi-stage voltage conversion and further includes a low-dropout linear regulator for converting the base power rail into other power rails required by the load.

[0035] Preferably, the wireless receiver further 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, wherein the voltage divider circuit connects the detected power voltage signal to the MCU voltage monitoring circuit.

[0036] In summary, compared with the prior art, the above-described technical solutions conceived by this invention can achieve the following beneficial effects:

[0037] The wireless power supply control method, external processing device, and system for implantable devices provided by this invention utilize a segmented power supply voltage control method. In the boost phase, the voltage is gradually increased to the maximum value to alleviate the large load impact on the resonant circuit of the external processing device during startup. In the step-down phase, the power supply voltage is gradually reduced from the maximum value to the rated value to alleviate the large load impact on the resonant circuit of the implantable device during startup. Power judgment is performed in conjunction with the current monitoring of the resonant circuit to avoid transient thermal damage and bioelectric or electrochemical interference, thereby achieving efficient and stable power transmission while ensuring biosafety. Attached Figure Description

[0038] Figure 1 This is a circuit diagram of the external processing device of the implantation system provided by the present invention;

[0039] Figure 2 This is a schematic diagram of the wireless receiver circuit of the implantation device in the implantation system provided by the present invention;

[0040] Figure 3 This is a circuit diagram of the external processing device of the implantation system provided in an embodiment of the present invention;

[0041] Figure 4 This is a circuit structure diagram of the energy storage circuit of the external processing device provided in an embodiment of the present invention;

[0042] Figure 5 This is a schematic diagram of the wireless receiver circuit of the implantation device in the implantation system provided in this embodiment of the invention. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0044] The wireless power supply control method for implantable devices provided by this invention includes the following steps:

[0045] Startup: Upon receiving the power-on command, the supply voltage of the first resonant circuit is gradually increased to its maximum value and maintained for a preset duration. Then, the supply voltage of the first resonant circuit is gradually decreased to its rated value. During this period, the current of the first resonant circuit is monitored to determine the load status.

[0046] Specifically, the first resonant circuit includes a transmitting coil;

[0047] Upon receiving the power-on command, the current of the first resonant circuit is monitored as the supply voltage is gradually increased to determine the load status. Specifically, when the current value of the first resonant circuit is detected to be 1.5 times or more of the maximum rated current, the load status is determined to be overcurrent.

[0048] The current of the first resonant circuit is monitored during the preset period of the highest voltage value to determine the load status; specifically as follows: when the current value of the first resonant circuit is detected to be 1.2 times or more of the maximum rated current, the load status is determined to be overcurrent.

[0049] The power supply voltage of the first resonant circuit is gradually reduced to the rated voltage value, and the current is monitored to determine the load status. Specifically, when the current value of the first resonant circuit is 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 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 within the preset power-on current range, the load is determined to be normal, and a successful power-on is reported.

[0050] When the load status is determined to be overcurrent or undercurrent, an exception handling procedure is performed.

[0051] Preferably, the supply voltage of the first resonant circuit is raised to the highest voltage value within 500ms; the highest voltage value is 1.2 to 1.5 times the rated voltage value; the highest value is maintained for a preset time so that the current value of the first resonant circuit tends to stabilize.

[0052] In this embodiment, a soft start is achieved by gradually increasing the supply voltage of the first resonant circuit during startup, which reduces the impact of large load surges during LC resonance establishment. Furthermore, raising 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 load surges during startup and can establish a relatively stable coupling power supply between the first and second resonant circuits. Simultaneously, real-time monitoring of the first resonant circuit current enables overcurrent protection, undercurrent protection, and metal detection protection. Only when the current remains within the normal range is a correct load detected and a voltage is output, gradually increasing the voltage-current ratio. Wireless power supply is terminated upon detecting undercurrent or overcurrent to prevent further damage from load faults. Moreover, when an abnormal metal object is detected, the first resonant circuit terminates wireless power supply to prevent itself from being damaged by overcurrent. Each power establishment process ensures the circuit safety of the implanted device through a power-controllable soft start.

[0053] Normal operation: Maintain the 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 as follows: when the current value of the first resonant circuit is 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 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, abnormal handling steps are performed.

[0054] The rated current range of this embodiment is typically 15 to 35 mA.

[0055] Power-down: Upon receiving the power-down command, the first resonant circuit is deenabled, the settings of the first power conversion circuit are reset, and then the power-down is reported as successful.

[0056] Abnormal handling: Report power-on failure or power supply abnormality, deenable the first resonant circuit and reset the first power conversion circuit settings; specifically, if the load status is determined to be overcurrent or undercurrent during the startup phase, report power-on failure; if the load status is determined to be overcurrent or undercurrent during the normal operation phase, report power supply abnormality.

[0057] Hardware protection: When the hardware protection circuit detects that the load current exceeds the hardware protection threshold for a preset duration, and the MCU control circuit fails to properly handle the overcurrent anomaly, the output of the first power conversion circuit is locked to cut off the power supply to the first resonant circuit until the system is powered down.

[0058] This invention employs a segmented power supply voltage control method. In the boost phase, the voltage is gradually increased to the maximum value to alleviate the large load impact on the first resonant circuit during startup. In the buck phase, the voltage is gradually reduced from the maximum value to the rated value to alleviate the large load impact on the second resonant circuit of the implanted device during startup. Power judgment is performed in conjunction with the current monitoring of the first resonant circuit to avoid transient thermal damage and bioelectric or electrochemical interference, thus achieving efficient and stable power transmission while ensuring biosafety.

[0059] The implantable device external processing device provided by this invention, such as Figure 1 As shown, it includes a first resonant circuit, a first power conversion circuit, a current sensing circuit, and an MCU control circuit.

[0060] The MCU control circuit receives instructions at its signal input terminal, 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 located between the first power conversion circuit and the first resonant circuit, and its output voltage signal is connected to the MCU control circuit.

[0061] A preferred embodiment further includes an energy storage circuit between the power supply and the first power conversion circuit;

[0062] A preferred embodiment 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 terminal of the main power switch.

[0063] in:

[0064] The first power conversion circuit preferably uses a DC-DC chip with programmable output voltage, which is used during startup to convert the power supply voltage into a supply voltage that conforms to the boost curve according to the output voltage control signal and supply it to the first resonant circuit.

[0065] The current sensing circuit includes a sampling resistor and a differential amplifier, used to detect the current in the first resonant circuit and output a voltage signal characterizing its magnitude.

[0066] 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 output voltage control signals and enable signals based on the instructions and load status. The MCU control circuit can also record the operating status and key events of the system according to actual needs.

[0067] 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.

[0068] The energy storage circuit, including a capacitor and a Schottky diode, is used to stabilize the input voltage of the first power conversion circuit and resist the instantaneous load surge during resonance establishment.

[0069] The hardware protection circuit is connected to the output voltage signal of the current sensing circuit and 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, the output of the first power conversion circuit is locked to cut off the power supply to 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 duration.

[0070] The implantation system provided by the present invention includes an external unit and an implantation device. The external unit includes an external processing device for the implantation device provided by the present invention, and the implantation device has a wireless receiving end.

[0071] The wireless receiver, 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.

[0072] 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 other power rails required by the load. The wide input voltage of the first resonant circuit maximizes the power supply distance and reduces the impact of large load surges on the implanted organism during the establishment of resonant coupling between the first and second resonant circuits. Correspondingly, the wireless receiver uses a low-rated-power input transformer DC-DC chip to ensure normal operation even with significant changes in distance from the external processing device, while maintaining high power efficiency. The input voltage range of the transformer DC-DC chip is 4.5-45V, preferably 4.5-20V.

[0073] Preferably, the wireless receiver further 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. The voltage divider circuit connects the detected power voltage signal to the MCU voltage monitoring circuit.

[0074] The following is an example:

[0075] The implantation system provided in this embodiment is a wireless brain-computer interface, including an external unit and an implantation device. The implantation device is an implantable brain-computer interface, and the external unit includes an external processing device for using high-frequency AC power of about 500kHz to power the implantable brain-computer interface.

[0076] Extracorporeal treatment device, structure as follows Figure 3 As shown, it includes a first resonant circuit, a first power conversion circuit, a current sensing circuit, a main power switch (power MOSFET), an MCU control circuit, an energy storage circuit, and a hardware protection circuit.

[0077] The MCU control circuit receives commands through a 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 located 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 from the current sensing circuit and is connected to the control terminal of the main power switch.

[0078] The first power conversion circuit uses a DC-DC chip with programmable output voltage. During startup, it is used to convert the power supply voltage into a supply voltage that conforms to the boost curve according to the output voltage control signal and supply it to the first resonant circuit.

[0079] The current sensing circuit, including a sampling resistor and a differential amplifier, employs an analog current sensor to detect the current in the first resonant circuit and output a voltage signal characterizing its magnitude.

[0080] In this embodiment, real-time detection of the current in the first resonant circuit enables overcurrent protection, undercurrent protection, and metal detection protection. Only when the current remains within the normal range is a correct load detected, and a voltage is output, gradually increasing the voltage-current ratio. Wireless power supply is terminated when undercurrent or overcurrent is detected to prevent further damage from load faults. When an abnormal metal object is detected, the first resonant circuit terminates wireless power supply to prevent itself from being damaged by overcurrent. Each power supply establishment process utilizes a power-controllable soft-start mechanism to ensure the circuit safety of the implanted device.

[0081] 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 output voltage control signals and enable signals according to the instructions and load status. The MCU control circuit can also be used to record the operating status and key events of the system according to actual needs.

[0082] The first resonant circuit is used to wirelessly power the second resonant circuit according to an enable signal, driven by the first power conversion circuit. Specifically, in this embodiment, the current of the first resonant circuit during normal operation is 15~20mA@8~10V (no load) and 25~35mA@8~10V (operation). The instantaneous current can reach 80mA. The rated voltage of the first resonant circuit is 9V, and the rated current is 30mA. (The first resonant circuit allows an input voltage of 5~18V, but in application, it is generally 7~10V. During startup, it uses 10~12V, meaning the maximum voltage is 10~12V.)

[0083] Energy storage circuits, such as Figure 4 As shown, the circuit includes capacitors and Schottky diodes to stabilize the input voltage of the first power conversion circuit and resist the instantaneous load surge during resonance establishment. Without an energy storage circuit, excessively high power at startup would cause a significant load surge to the power supply from the first resonant circuit.

[0084] The hardware protection circuit, connected to the output voltage signal of the current sensing circuit and the control terminal of the main power switch, is used to lock the output of the first power conversion circuit to cut off the power supply to the first resonant circuit 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. 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, the hardware protection circuit forcibly locks the wireless power supply, which can only be restored after the system is powered off, ensuring the safety of the system after a fault. 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 shows that the current of the first resonant circuit reaches 37.5mA and the duration exceeds 0.2s, it is judged as an overcurrent, and the output of the first power conversion circuit is locked to cut off the power supply to the first resonant circuit.

[0085] 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.

[0086] The second power conversion circuit includes an input DC-DC chip with a wide input voltage range to provide the base power rail, and employs multi-stage voltage conversion. It also includes a low-dropout linear regulator (LDO) chip to convert the base power rail into other power rails required by the load. The transformer DC-DC chip has a nominal input voltage range of 4.5-45V. This wide input voltage range ensures that the implanted device can operate normally even with significant changes in distance from the external processing device, while maintaining high power efficiency.

[0087] The basic power rail of the wireless receiver is output by a DC-DC chip, ensuring high energy conversion efficiency; while the extended power rail is output through a low dropout linear regulator (LDO). The LDO has a high startup speed and can still ensure a reasonable power-on sequence in the case of power cascading, ensuring the normal startup of subsequent loads.

[0088] 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, which also monitors the current. If there is an overcurrent or undercurrent, the MCU voltage monitoring circuit will send an abnormal current signal to the MCU control circuit of the external processing device via wireless communication. The MCU control circuit of the external processing device reports a power-on failure, disables the first resonant circuit, and resets the settings of the first power conversion circuit.

[0089] Because the wireless receiver circuit of the implanted device is a purely passive design, the system's wireless power-on, power-off, and power-off processes are controlled by the external processing unit of the implanted device, as follows:

[0090] start up:

[0091] S1. After the system starts up and receives the power-on command, the MCU control circuit of the implanted device's external processing 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.

[0092] S2. The voltage of the first resonant circuit is gradually increased to the highest value by the first power conversion circuit. During this process, the MCU control circuit monitors whether there is an overcurrent in the input current of the first power conversion circuit from the current sensing circuit. If there is, it jumps to S5.

[0093] Specifically, in this embodiment, the maximum voltage is 12V. The voltage needs to be gradually increased to 12V within 500ms. If the current exceeds 1.5 times or more of the rated current during the process of increasing the voltage to 12V, it is judged as an overcurrent. In this embodiment, the rated current is 30mA. That is, during this process, when the current exceeds 45mA, it is judged as an overcurrent.

[0094] S3. The first power conversion circuit maintains the voltage of the first resonant circuit at its highest value for a certain period of time. During this process, the MCU control circuit monitors the input current of the first power conversion circuit from the current sensing circuit to see if there is an overcurrent. If so, it jumps to S5.

[0095] Specifically, in this embodiment, the voltage of the first resonant circuit is maintained at 12V until its current value tends to stabilize. During this process, the MCU control circuit monitors the input current of the first power conversion circuit from the current sensing circuit to see if there is an overcurrent. If the current exceeds 1.2 times or more of the rated current maximum value, it is judged as an overcurrent. That is, in this embodiment, the rated current is 30mA, and when the current exceeds 36mA, it is judged as an overcurrent.

[0096] S4. The first power conversion circuit gradually reduces the voltage of the first resonant circuit to the rated value. During this process, the MCU control circuit monitors the input current of the first power conversion circuit from the current sensing circuit to see if there is overcurrent or undercurrent. If there is, it jumps to S5. If there is no overcurrent, it reports that the power-on is successful.

[0097] In this embodiment, the rated voltage 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 rated current maximum value, it is judged as overcurrent. If the current is less than 0.9 times or less of the rated current maximum value, it is judged as undercurrent. That is, in this embodiment, the rated current is 30mA. When the current exceeds 33mA, it is judged as overcurrent. When the current is less than 27mA, it is judged as undercurrent.

[0098] Exception handling:

[0099] S5. The MCU control circuit reports a power-on failure and de-enables the first resonant circuit, while resetting the settings of the first power conversion circuit.

[0100] Normal operation:

[0101] 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 the input current of the first power conversion circuit from the current sensing circuit to see if there is overcurrent or undercurrent. If there is overcurrent or undercurrent, it reports a power supply abnormality, de-enables the first resonant circuit, and resets the settings of the first power conversion circuit.

[0102] 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 rated current maximum value, it is judged as overcurrent. If the current is less than 0.9 times or less of the rated current maximum value, 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. When the current is less than 27mA, it is judged as undercurrent.

[0103] Power off:

[0104] S7. After receiving the power-down command, de-enable the first resonant circuit, reset the settings of the first power conversion circuit, and then report that the power-down was successful.

[0105] Hardware protection:

[0106] S8. During or after power-on, the hardware protection circuit continuously monitors for overcurrent. If overcurrent exists and persists for a certain period, it indicates that S5 or S6 has not handled the abnormal situation correctly. In this case, the output of the first power conversion circuit is locked to cut off the power supply to the first resonant circuit. The system recovers after power-down. 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 shows that the current of the first resonant circuit reaches 37.5mA and the duration exceeds 0.2s, it is judged as an overcurrent, and the output of the first power conversion circuit is locked to cut off the power supply to the first resonant circuit.

[0107] Those skilled in the art will readily understand 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 within the scope of protection of the present invention.

Claims

1. A wireless power supply control method for an implantable device, characterized in that, Includes the following steps: Upon receiving the power-on command, the supply voltage of the first resonant circuit is gradually increased to the highest voltage value and maintained for a preset time. The highest voltage value is 1.2 or more of the rated voltage value. The current value of the first resonant circuit is stabilized by maintaining the highest value for a preset time. Then, the supply voltage of the first resonant circuit is gradually reduced to the rated voltage value. Maintain the supply voltage of the first resonant circuit at the rated voltage value, and supply power to the second resonant circuit; Upon receiving the power-down command, the first resonant circuit is deenabled, and the settings of the first power conversion circuit are reset.

2. The wireless power supply control method for implantable devices as described in claim 1, characterized in that, Before receiving the power-down command, the method further includes: monitoring the current value of the first resonant circuit; if it is determined that the load state is overcurrent or undercurrent, then deactivating the first resonant circuit and resetting the settings of the first power conversion circuit.

3. The wireless power supply control method for implantable devices as described in claim 2, characterized in that, The monitoring of the current value of the first resonant circuit specifically includes: monitoring the current of the first resonant circuit during the phase of gradually increasing the supply voltage of the first resonant circuit after receiving the power-on command, and determining the load status; and, During the preset duration period when the supply voltage of the first resonant circuit is maintained at its highest value, the current is monitored to determine the load status; and, The load status is determined by 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 stage.

4. The wireless power supply control method for implantable devices as described in claim 3, characterized in that, The monitoring of the current value of the first resonant circuit specifically includes: during the stage of gradually increasing the power supply voltage of the first resonant circuit after receiving the power-on command, when the current value of the first resonant circuit is detected to be 1.5 times or more of the maximum rated current, the load condition is determined to be overcurrent. During the preset time period of maintaining the power supply voltage of the first resonant circuit at the highest voltage value, if the current value of the first resonant circuit is detected to be 1.2 times or more of the maximum rated current, the load condition is determined to be overcurrent. The process 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 stage, when the current value of the first resonant circuit is detected to be 1.1 times or more of the maximum rated current, the load condition is determined to be overcurrent; when the current value of the first resonant circuit is detected to be 0.9 times or less of the minimum rated current, the load condition is determined to be undercurrent.

5. The wireless power supply control method for implantable devices as described in claim 2, characterized in that, It also includes 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 duration, it locks the output of the first power conversion circuit to cut off the power supply to the first resonant circuit until the system is powered down.

6. An external processing device for an implantable device, employing the wireless power supply control method for an implantable device as described in any one of claims 1 to 5, characterized in that, It includes a first resonant circuit, a first power conversion circuit, a current sensing circuit, and an MCU control circuit; The MCU control circuit receives instructions at its signal input terminal, 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 located 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 during startup to convert the power supply voltage into a supply voltage that conforms to the boost curve according to the output voltage control signal and supply it to the first resonant circuit. The current sensing circuit is used to detect the current in the first resonant circuit and output a voltage signal characterizing its magnitude. 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 output voltage control signals and enable signals according to the instructions and the load status. 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 extracorporeal processing device for implantable devices as described in claim 6, characterized in that, It also includes an energy storage circuit 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 surge when resonance is established.

8. The extracorporeal processing device for implantable devices as described in claim 6, characterized in that, The current sensing circuit includes a sampling resistor and a differential amplifier.

9. The extracorporeal processing device for implantable devices as described in claim 6, characterized in that, It also includes hardware protection circuitry; The hardware protection circuit is connected to the output voltage signal of the current sensing circuit and 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, the circuit 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.

10. An implantation system, characterized in that, It includes an external machine and an implantable device, wherein the external machine includes an external processing device for the implantable device as described in any one of claims 6 to 9, and the implantable device has a wireless receiver.

11. The implantation system as claimed in claim 10, characterized in that, The wireless receiver 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 DC-DC chip with a wide input voltage range for providing a base power rail.

12. The implantation system as claimed in claim 11, characterized in that, The second power conversion circuit employs multi-stage voltage conversion and also includes a low-dropout linear regulator for converting the base power rail into other power rails required by the load.

13. The implantation system as claimed in claim 11, characterized in that, The wireless receiver 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. The voltage divider circuit connects the detected power voltage signal to the MCU voltage monitoring circuit.

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