Low-power-consumption wearable electrocardiogram monitoring system and control method thereof

Abstract

The invention discloses a low-power-consumption wearable electrocardiogram monitoring system and a control method thereof.The low-power-consumption wearable electrocardiogram monitoring system comprises a plantar piezoelectric energy collecting device, a back photovoltaic energy collecting device, a power management module and an electrocardiogram signal monitoring module, and mechanical energy generated by user movement is converted into electric energy through the plantar piezoelectric energy collecting device; solar energy in an illumination environment is converted into electric energy through the back photovoltaic energy collection device, and the electric energy collected by the sole piezoelectric energy collection device and the back photovoltaic energy collection device is subjected to voltage stabilization and collection through the micro energy collection unit. The electric energy collected by the micro-energy collecting unit is stored and output-controlled through the energy control management unit, so that the electric energy is provided for the electrocardiosignal monitoring module, and electrocardiosignals of a user are collected through the electrocardiosignal monitoring module and processed to obtain electrocardiosignal monitoring data. The battery life, the energy conversion efficiency and the user experience of the electrocardiogram monitoring system are improved, and the method can be applied to the technical field of electrocardiogram monitoring.

Description

Technical Field

[0001] The present invention relates to the technical field of electrocardiogram monitoring, and in particular to a low-power wearable electrocardiogram monitoring system and a control method thereof. Background Art

[0002] As an important physiological signal acquisition device, ECG monitoring system is widely used in medical health monitoring, disease diagnosis, sports monitoring and other fields. Traditional ECG monitoring systems usually rely on external batteries or regularly charged batteries to provide energy, which not only increases the maintenance cost of the equipment, but also due to the limitation of battery life, users may face the problem of insufficient power or frequent battery replacement during long-term use. In addition, traditional ECG monitoring equipment usually has the problems of large size and poor comfort, and the convenience of long-term wearing and user experience are relatively neglected.

[0003] With the rapid development of wearable technology, many ECG monitoring systems try to reduce energy consumption and improve the system's endurance through low-power chips and wireless transmission technology. However, existing low-power ECG monitoring systems still face the following challenges: First, the battery life problem is still prominent. Although the use of low-power chips can reduce power consumption, the continuous operation of the ECG monitoring system still requires stable power support. Traditional batteries have a short service life, are inconvenient to charge, and need to be replaced regularly, which increases the burden on device users. Second, some existing ECG monitoring systems try to supplement the battery deficiency through external energy harvesting methods or built-in energy harvesting devices, but these methods have low energy conversion efficiency and usually depend on specific environmental conditions, such as sunlight intensity or user exercise intensity. Finally, most current ECG monitoring devices rely on large-capacity batteries or battery modules, which makes the device larger and inconvenient to wear for a long time, affecting the user's comfort. Summary of the invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide a wearable ECG monitoring system with high efficiency and low power consumption, which does not require regular charging. The system realizes continuous monitoring of the user's ECG signals through a piezoelectric energy harvesting device on the sole of the foot, a photovoltaic energy harvesting device on the back, a micro energy collection unit, an energy control management unit and an ECG signal monitoring module, and also improves the battery life, energy conversion efficiency and user experience of the ECG monitoring system.

[0005] The first technical solution adopted by the present invention is:

[0006] A low-power wearable ECG monitoring system includes a foot piezoelectric energy harvesting device, a back photovoltaic energy harvesting device, a power management module and an ECG signal monitoring module, wherein:

[0007] The power management module includes a micro energy collection unit and an energy control management unit. The output end of the plantar piezoelectric energy collection device and the output end of the back photovoltaic energy collection device are both connected to the input end of the micro energy collection unit, and the output end of the micro energy collection unit is connected to the input end of the energy control management unit. The energy control management unit is electrically connected to the electrocardiogram signal monitoring module. The plantar piezoelectric energy collection device can be worn on the sole of the user's foot, and is used to convert the mechanical energy generated by the user's movement into electrical energy. The back photovoltaic energy collection device can be worn on the user's back, and is used to convert solar energy in a lighting environment into electrical energy. The micro energy collection unit is used to stabilize and collect the electrical energy collected by the plantar piezoelectric energy collection device and the back photovoltaic energy collection device. The energy control management unit is used to store and output control the electrical energy collected by the micro energy collection unit. The electrocardiogram signal monitoring module is used to collect the user's electrocardiogram signal and process it to obtain electrocardiogram monitoring data.

[0008] Furthermore, the plantar piezoelectric energy harvesting device includes a bicrystalline silicon circular piezoelectric piece and a first energy output interface, and the bicrystalline silicon circular piezoelectric piece is connected to the input end of the micro energy collection unit through the first energy output interface.

[0009] Furthermore, the back photovoltaic energy collection device includes a flexible amorphous silicon solar panel and a second energy output interface, and the flexible amorphous silicon solar panel is connected to the input end of the micro energy collection unit through the second energy output interface.

[0010] Furthermore, the micro energy collection unit includes a full-wave rectifier module, a piezoelectric energy collection chip and a photovoltaic energy collection chip. The output end of the plantar piezoelectric energy collection device is connected to the input end of the full-wave rectifier module, the output end of the full-wave rectifier module is connected to the input end of the piezoelectric energy collection chip, the output end of the piezoelectric energy collection chip is connected to the input end of the energy control management unit, the output end of the back photovoltaic energy collection device is connected to the input end of the photovoltaic energy collection chip, and the output end of the photovoltaic energy collection chip is connected to the input end of the energy control management unit.

[0011] Furthermore, the energy control management unit includes an energy grading storage module, a timer chip, a DC-DC chip and a threshold judgment module. The input end of the energy grading storage module is connected to the output end of the micro energy collection unit, the output end of the energy grading storage module is connected to the voltage input end of the DC-DC chip through the threshold judgment module, the output end of the timer chip is connected to the enable end of the DC-DC chip, and the output end of the DC-DC chip is electrically connected to the electrocardiogram signal monitoring module. The energy grading storage module is used to perform hierarchical storage of the electric energy collected by the micro energy collection unit, the timer chip is used to output a high level signal to the enable end of the DC-DC chip according to a preset time interval, and the threshold judgment module is used to connect the output end of the energy grading storage module to the voltage input end of the DC-DC chip when the voltage of the energy grading storage module reaches a preset threshold, and the DC-DC chip is used to perform voltage conversion on the electric energy output by the energy grading storage module and provide it to the electrocardiogram signal monitoring module.

[0012] Further, the energy hierarchical storage module includes a first super capacitor, a second super capacitor, a third super capacitor, a fourth super capacitor, a first PMOS tube, a second PMOS tube, a third PMOS tube, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor, the capacities of the first super capacitor, the second super capacitor, the third super capacitor and the fourth super capacitor increase in sequence, the positive electrode of the first super capacitor and the source electrode of the first PMOS tube are both connected to the output end of the micro energy collection unit, the positive electrode of the second super capacitor and the source electrode of the second PMOS tube are both connected to the drain electrode of the first PMOS tube, the positive electrode of the third super capacitor and the source electrode of the third PMOS tube are both connected to the drain electrode of the second PMOS tube, The positive electrode of the fourth super capacitor is connected to the drain of the third PMOS tube, the gate of the first PMOS tube is connected to one end of the first resistor, the gate of the second PMOS tube is connected to one end of the second resistor, the gate of the third PMOS tube is connected to one end of the third resistor, the negative electrode of the first super capacitor, the negative electrode of the second super capacitor, the negative electrode of the third super capacitor, the negative electrode of the fourth super capacitor, the other end of the first resistor, the other end of the second resistor and the other end of the third resistor are all grounded, the fourth resistor is connected between the source and the gate of the first PMOS tube, the fifth resistor is connected between the source and the gate of the second PMOS tube, and the sixth resistor is connected between the source and the gate of the third PMOS tube.

[0013] Furthermore, the ECG signal monitoring module includes three-lead electrodes, an ECG signal acquisition chip, a main control chip and a data transmission unit, the input end of the ECG signal acquisition chip is connected to the three-lead electrodes, the output end of the ECG signal acquisition chip is connected to the input end of the main control chip, the main control chip is signal-connected to the data transmission unit, the ECG signal acquisition chip and the main control chip are both electrically connected to the energy control management unit, the three-lead electrodes are used to collect the user's ECG signals, the ECG signal acquisition chip is used to amplify and filter the user's ECG signals, and the main control chip is used to transmit the ECG monitoring data to a host computer through the data transmission unit.

[0014] Furthermore, the ECG signal acquisition chip is an AD8232 chip, the main control chip is an STM32L151C8T6 chip, and the data transmission unit is a DX-BT24 Bluetooth module.

[0015] The second technical solution adopted by the present invention is:

[0016] A control method for a low-power wearable ECG monitoring system, which is used to be executed by the above-mentioned low-power wearable ECG monitoring system, comprises the following steps:

[0017] The mechanical energy generated by the user's movement is converted into electrical energy through the foot piezoelectric energy harvesting device;

[0018] The solar energy in the lighting environment is converted into electrical energy through the back photovoltaic energy collection device;

[0019] The electric energy collected by the foot piezoelectric energy collection device and the back photovoltaic energy collection device is stabilized and collected by the micro energy collection unit;

[0020] The energy control management unit is used to store and output the electric energy collected by the micro energy collection unit, thereby providing electric energy for the electrocardiogram signal monitoring module;

[0021] The ECG signal monitoring module collects the user's ECG signal and processes it to obtain ECG monitoring data.

[0022] Furthermore, the energy control management unit includes an energy classification storage module, a timer chip, a DC-DC chip and a threshold judgment module, and the storage and output control of the electric energy collected by the micro energy collection unit specifically includes:

[0023] The electric energy collected by the micro energy collection unit is stored in a hierarchical manner through the energy hierarchical storage module;

[0024] Outputting a high level signal to the enable terminal of the DC-DC chip according to a preset time interval through the timer chip;

[0025] When the voltage of the energy grading storage module reaches a preset threshold, the output end of the energy grading storage module is connected to the voltage input end of the DC-DC chip through the threshold judgment module;

[0026] When a high-level signal is input to the enable end of the DC-DC chip and the voltage input end of the DC-DC chip is connected to the output end of the energy grading storage module, the DC-DC chip performs voltage conversion on the electric energy output by the energy grading storage module and provides it to the electrocardiogram signal monitoring module.

[0027] The beneficial effects of the present invention are as follows: the low-power wearable ECG monitoring system of the present invention comprises a piezoelectric energy harvesting device at the sole of the foot, a photovoltaic energy harvesting device at the back, a power management module and an ECG signal monitoring module, the power management module comprises a micro-energy harvesting unit and an energy control management unit, the mechanical energy generated by the user's movement is converted into electrical energy through the piezoelectric energy harvesting device at the sole of the foot, the solar energy in the lighting environment is converted into electrical energy through the photovoltaic energy harvesting device at the back, the electrical energy collected by the piezoelectric energy harvesting device at the sole of the foot and the photovoltaic energy harvesting device at the back is stabilized and collected by the micro-energy harvesting unit, the electrical energy collected by the micro-energy harvesting unit is stored and output controlled by the energy control management unit, thereby providing electrical energy for the ECG signal monitoring module, and the ECG signal of the user is collected and processed by the ECG signal monitoring module to obtain ECG monitoring data. The low-power wearable ECG monitoring system of the present invention does not require regular charging and is highly efficient. Through the piezoelectric energy harvesting device on the sole of the foot, the photovoltaic energy harvesting device on the back, the micro-energy collection unit, the energy control management unit and the ECG signal monitoring module, it realizes continuous monitoring of the user's ECG signals, and also improves the battery life, energy conversion efficiency and user experience of the ECG monitoring system. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of module connections of a low-power wearable ECG monitoring system provided by an embodiment of the present invention;

[0029] Figure 2 A circuit diagram of a micro energy harvesting unit provided by an embodiment of the present invention;

[0030] Figure 3 A circuit structure diagram of an energy hierarchical storage module provided in an embodiment of the present invention;

[0031] Figure 4 A circuit diagram of an energy control management unit provided in an embodiment of the present invention;

[0032] Figure 5 A flowchart of a control method for a low-power wearable electrocardiogram monitoring system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The step numbers in the following embodiments are only provided for the convenience of explanation and description, and the order between the steps is not limited in any way. The execution order of each step in the embodiment can be adaptively adjusted according to the understanding of those skilled in the art.

[0034] In the description of the present invention, the meaning of "a plurality" is more than two. If there is a description of "a first" or "a second", it is only used to distinguish the technical features, and it cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features. In addition, unless otherwise defined, all technical and scientific terms used in this article have the same meaning as those commonly understood by those skilled in the art. The terms used in this specification are only for describing specific embodiments, not for limiting the present invention.

[0035] Reference Figure 1 The embodiment of the present invention provides a low-power wearable ECG monitoring system, including a foot piezoelectric energy harvesting device, a back photovoltaic energy harvesting device, a power management module and an ECG signal monitoring module, wherein:

[0036] The power management module includes a micro energy collection unit and an energy control management unit. The output end of the plantar piezoelectric energy collection device and the output end of the back photovoltaic energy collection device are both connected to the input end of the micro energy collection unit, the output end of the micro energy collection unit is connected to the input end of the energy control management unit, the energy control management unit is electrically connected to the electrocardiogram signal monitoring module, the plantar piezoelectric energy collection device can be worn on the sole of the user's foot, and is used to convert the mechanical energy generated by the user's movement into electrical energy, the back photovoltaic energy collection device can be worn on the user's back, and is used to convert solar energy in a lighting environment into electrical energy, the micro energy collection unit is used to stabilize and collect the electrical energy collected by the plantar piezoelectric energy collection device and the back photovoltaic energy collection device, the energy control management unit is used to store and output control the electrical energy collected by the micro energy collection unit, and the electrocardiogram signal monitoring module is used to collect the user's electrocardiogram signal and process it to obtain electrocardiogram monitoring data.

[0037] The low-power wearable ECG monitoring system of the present invention does not require regular charging and is highly efficient. Through the piezoelectric energy harvesting device on the sole of the foot, the photovoltaic energy harvesting device on the back, the micro-energy collection unit, the energy control management unit and the ECG signal monitoring module, it realizes continuous monitoring of the user's ECG signals, and also improves the battery life, energy conversion efficiency and user experience of the ECG monitoring system.

[0038] Reference Figure 1 As an optional implementation, the plantar piezoelectric energy harvesting device includes a bicrystalline silicon circular piezoelectric piece and a first energy output interface, and the bicrystalline silicon circular piezoelectric piece is connected to the input end of the micro energy collection unit through the first energy output interface.

[0039] Specifically, the plantar piezoelectric energy harvesting device is one of the key components of the embodiment of the present invention, and is mainly used to collect mechanical energy from the irregular movements of the user and convert it into electrical energy. The device uses a bicrystalline silicon circular piezoelectric piece made of a relatively efficient piezoelectric ceramic material. The pressure applied by the user during walking or stepping causes the piezoelectric piece to deform to achieve the conversion of mechanical energy into electrical energy. The piezoelectric energy harvesting device of the embodiment of the present invention is relatively small in size. In actual use, the plantar piezoelectric energy harvesting device only needs to be placed on the sole of the shoe and connected to the first energy output interface to achieve energy harvesting, which greatly enhances the portability and portability of the embodiment of the present invention.

[0040] Reference Figure 1 As an optional implementation, the back photovoltaic energy collection device includes a flexible amorphous silicon solar panel and a second energy output interface, and the flexible amorphous silicon solar panel is connected to the input end of the micro energy collection unit through the second energy output interface.

[0041] Specifically, the back photovoltaic energy harvesting device is another key component of the embodiment of the present invention, which is mainly used to collect solar energy through the photovoltaic effect under illumination and convert it into electrical energy. The device uses a flexible amorphous silicon solar panel, which can provide stable power supplement for the system under different illumination conditions, and is particularly suitable for wearable devices that are worn for a long time and are inconvenient to charge.

[0042] Amorphous silicon material is a semiconductor material widely used in solar cells, with excellent photoelectric conversion efficiency and low production cost. Compared with crystalline silicon solar cells, amorphous silicon has higher flexibility and adjustable spectral response range, and is therefore suitable for use in flexible photovoltaic devices. The embodiment of the present invention applies amorphous silicon material to a flexible substrate, and the solar panel not only has good photoelectric conversion capability, but also has strong adaptability, and can maintain high performance in a bent, folded or twisted state.

[0043] The design of the flexible amorphous silicon solar panel in the embodiment of the present invention fully considers the comfort and practical use requirements of wearable devices. The solar panel adopts a thin film structure, combined with a flexible substrate, so that it can flexibly fit the user's back or other wearing parts without adding extra volume and weight. This design ensures that the device will not cause discomfort to the user during wearing, nor will it restrict the user's activities.

[0044] Reference Figure 1 As an optional implementation, the micro energy collection unit includes a full-wave rectifier module, a piezoelectric energy collection chip and a photovoltaic energy collection chip. The output end of the sole piezoelectric energy collection device is connected to the input end of the full-wave rectifier module, the output end of the full-wave rectifier module is connected to the input end of the piezoelectric energy collection chip, the output end of the piezoelectric energy collection chip is connected to the input end of the energy control management unit, the output end of the back photovoltaic energy collection device is connected to the input end of the photovoltaic energy collection chip, and the output end of the photovoltaic energy collection chip is connected to the input end of the energy control management unit.

[0045] Specifically, the micro energy collection unit is one of the core parts of the power management module of the embodiment of the present invention, which is mainly responsible for collecting and converting the mechanical energy and light energy obtained from external energy sources (including the piezoelectric energy collection device on the sole and the photovoltaic energy collection device on the back) to ensure that the system can work continuously and stably. The design goal of the micro energy collection unit is to maximize the energy collection efficiency and provide sufficient power support for the system through efficient power conversion and storage solutions.

[0046] like Figure 2 The figure shows a circuit diagram of a micro energy collection unit provided by an embodiment of the present invention. The piezoelectric energy collected by the two sole piezoelectric energy collection devices corresponding to the left foot and the right foot first passes through two full-wave rectifier modules respectively, and then passes through an anti-reverse connection diode, and then is connected in parallel with the photovoltaic energy collected by the back photovoltaic energy collection device and input into different types of micro energy collection chips, wherein the piezoelectric energy collected by the sole piezoelectric energy collection device is input into the piezoelectric energy collection chip, and the photovoltaic energy collected by the back photovoltaic energy collection device is input into the photovoltaic energy collection chip; the micro energy collected by the micro energy collection chip is first stabilized by an LDO circuit, and then stored in a small capacitor. When the voltage of the small capacitor reaches a certain threshold, it will transmit electric energy to the energy control management unit. When the voltage is lower than the threshold voltage, it will stop transmitting electric energy to the energy control management unit, and collect electric energy again, switching the working mode repeatedly. This working mode can fully improve the efficiency and performance of the system in collecting energy.

[0047] Reference Figure 1, further as an optional implementation, the energy control management unit includes an energy grading storage module, a timer chip, a DC-DC chip and a threshold judgment module, the input end of the energy grading storage module is connected to the output end of the micro energy collection unit, the output end of the energy grading storage module is connected to the voltage input end of the DC-DC chip through the threshold judgment module, the output end of the timer chip is connected to the enable end of the DC-DC chip, the output end of the DC-DC chip is electrically connected to the electrocardiogram signal monitoring module, the energy grading storage module is used to perform grading storage on the electric energy collected by the micro energy collection unit, the timer chip is used to output a high level signal to the enable end of the DC-DC chip according to a preset time interval, the threshold judgment module is used to connect the output end of the energy grading storage module to the voltage input end of the DC-DC chip when the voltage of the energy grading storage module reaches a preset threshold, and the DC-DC chip is used to perform voltage conversion on the electric energy output by the energy grading storage module and provide it to the electrocardiogram signal monitoring module.

[0048] Reference Figure 3 As an optional embodiment, the energy hierarchical storage module includes a first super capacitor C30, a second super capacitor C40, a third super capacitor C50, a fourth super capacitor C60, a first PMOS tube Q13, a second PMOS tube Q14, a third PMOS tube Q15, a first resistor R86, a second resistor R89, a third resistor R91, a fourth resistor R87, a fifth resistor R88 and a sixth resistor R90. The capacities of the first super capacitor C30, the second super capacitor C40, the third super capacitor C50 and the fourth super capacitor C60 increase in sequence. The positive electrode of the first super capacitor C30 and the source electrode of the first PMOS tube Q13 are both connected to the output end of the micro energy collection unit, the positive electrode of the second super capacitor C40 and the source electrode of the second PMOS tube Q14 are both connected to the drain electrode of the first PMOS tube Q13, and the positive electrode of the third super capacitor C50 and the source electrode of the third PMOS tube Q15 are both connected to the drain electrode of the first PMOS tube Q13. The fourth super capacitor C60 is connected to the drain of the second PMOS tube Q14, the positive electrode of the fourth super capacitor C60 is connected to the drain of the third PMOS tube Q15, the gate of the first PMOS tube Q13 is connected to one end of the first resistor R86, the gate of the second PMOS tube Q14 is connected to one end of the second resistor R89, the gate of the third PMOS tube Q15 is connected to one end of the third resistor R91, the negative electrode of the first super capacitor C30, the negative electrode of the second super capacitor C40, the negative electrode of the third super capacitor C50, the negative electrode of the fourth super capacitor C60, the other end of the first resistor R86, the other end of the second resistor R89 ​​and the other end of the third resistor R91 are all grounded, the fourth resistor R87 is connected between the source and the gate of the first PMOS tube Q13, the fifth resistor R88 is connected between the source and the gate of the second PMOS tube Q14, and the sixth resistor R90 is connected between the source and the gate of the third PMOS tube Q15.

[0049] Specifically, the piezoelectric energy and photovoltaic energy collected by the micro energy collection unit are input into the energy control management unit in parallel through the anti-reverse connection diode. The energy control management unit has a total of four super capacitors with capacities from small to large. The energy will first be stored in the first super capacitor C30 with small capacity. Due to the dynamic allocation function of the PMOS tube, the first PMOS tube Q13, the second PMOS tube Q14 and the third PMOS tube Q15 are all in the closed state at this time, and the voltage of the first super capacitor C30 continues to increase. When it increases to the threshold voltage, the first PMOS tube Q13 is turned on, and the energy begins to be transmitted to the second super capacitor C40. At this time, the second PMOS tube Q14 and the third PMOS tube Q15 are still in the closed state. By analogy, the power will only be charged to the subsequent super capacitor when the previous super capacitor is fully charged. At the same time, due to the parasitic diode characteristics of the PMOS tube, when the voltage of the small-capacity super capacitor is lower than the voltage of the large-capacity super capacitor, the large-capacity super capacitor will also charge the small-capacity super capacitor. Use small-capacity supercapacitors to power ultra-low power chips such as timer chips, and large-capacity supercapacitors to power chips that require higher power consumption such as microcontrollers or ECG acquisition chips, so that the entire system can respond quickly.

[0050] like Figure 4 The figure shows a circuit diagram of the energy control management unit provided by an embodiment of the present invention, wherein the timer chip U17 is configured to start once every 30 minutes and output a high level to the enable terminal EN of the low-power DC-DC chip U21. At the same time, the freewheeling diode D24 constitutes a threshold judgment circuit. Only when the voltage of the large-capacity supercapacitor reaches the threshold voltage and the timer chip U17 gives an enable signal, the DC-DC chip U21 will output a voltage to power the entire system.

[0051] Reference Figure 1 As an optional implementation, the ECG signal monitoring module includes three-lead electrodes, an ECG signal acquisition chip, a main control chip and a data transmission unit. The input end of the ECG signal acquisition chip is connected to the three-lead electrodes, the output end of the ECG signal acquisition chip is connected to the input end of the main control chip, the main control chip is signal-connected to the data transmission unit, the ECG signal acquisition chip and the main control chip are both electrically connected to the energy control management unit, the three-lead electrodes are used to collect the user's ECG signals, the ECG signal acquisition chip is used to amplify and filter the user's ECG signals, and the main control chip is used to transmit the ECG monitoring data to the host computer through the data transmission unit.

[0052] As a further optional implementation, the ECG signal acquisition chip is an AD8232 chip, the main control chip is an STM32L151C8T6 chip, and the data transmission unit is a DX-BT24 Bluetooth module.

[0053] Specifically, the ECG signal monitoring module is the core part of the embodiment of the present invention, which is responsible for collecting ECG signals from the human body, amplifying, filtering, and processing the signals, and transmitting the processed ECG data to the host computer for further analysis. The module uses the low-power AD8232 ECG acquisition chip, which can minimize energy consumption while ensuring monitoring accuracy, thereby extending the service life of the system.

[0054] Through the AD8232 ECG acquisition chip, weak ECG signals are acquired from the human body and amplified and filtered to ensure the quality and accuracy of the signal; the low-power STM32L151C8T6 main control chip is responsible for further processing and analysis of the ECG signals, and controls the operating status of the system, including timed acquisition of ECG signals, control of sleep and wake-up, etc.; the low-power DX-BT24 Bluetooth module is used to wirelessly transmit the processed ECG signals to the host computer, which is convenient for doctors or users to conduct remote monitoring and data analysis.

[0055] The ECG signal monitoring module uses the AD8232 chip, which has highly integrated functions and is specifically used to obtain low-voltage, low-frequency ECG signals from the human body. The input end of the AD8232 contacts the human skin through a standard three-lead heart electrode, and the collected ECG signals are usually very weak, about tens of microvolts. In order to ensure the accuracy of the signal, the AD8232 chip first amplifies the signal to a level suitable for further processing.

[0056] AD8232 also has built-in high-pass and low-pass filters, which can effectively remove external interference such as electromyographic noise and power frequency interference to ensure the clarity of ECG signals. After filtering and amplification, the collected ECG signals are sent to the main control chip for subsequent processing.

[0057] The system structure and working principle of the low-power wearable ECG monitoring system of the embodiment of the present invention are described above. It can be recognized that the present invention adopts the sole piezoelectric energy harvesting device and the back photovoltaic energy harvesting device to achieve complete self-power supply. The system does not rely on external batteries or regular charging, eliminating the problem of insufficient battery power or inconvenient charging. Energy is collected through daily activities (such as walking or sunlight exposure) to ensure that the device can operate stably for a long time; the power management module includes a micro energy collection circuit and an energy control management circuit, which can maximize the use of energy collected from the piezoelectric device and the solar panel. Through efficient rectification, voltage regulation and maximum power point tracking (MPPT) technology, the system ensures maximum energy collection, and through intelligent energy storage management, ensures continuous and stable operation of the system and avoids waste. In addition, the core components of the system are designed with low power consumption, such as AD823 2 ECG acquisition chip, STM32L151C8T6 main control chip and low-power DX-BT24 Bluetooth module. Through these low-power chips, the system can efficiently complete the ECG signal acquisition and data transmission tasks while maintaining low energy consumption; the low-power wearable ECG monitoring system of the present invention can accurately collect weak ECG signals from the human body through the high-precision, low-power AD8232 ECG acquisition chip, and amplify and filter them to ensure the high quality and reliability of the signals. The processed data can be transmitted to the host computer in real time through the low-power Bluetooth module, and users or doctors can conveniently perform remote health monitoring and medical analysis. In addition, the system adopts intelligent timing acquisition and sleep management, automatically collects ECG signals every 30 minutes and transmits data, and maintains low power consumption or sleep state for the rest of the time to avoid unnecessary energy waste, further extending the service life of the equipment.

[0058] The low-power wearable ECG monitoring system of the present invention does not require regular charging and is highly efficient. Through the piezoelectric energy harvesting device on the sole of the foot, the photovoltaic energy harvesting device on the back, the micro-energy collection unit, the energy control management unit and the ECG signal monitoring module, the continuous monitoring of the user's ECG signal is achieved, and the battery life, energy conversion efficiency and user experience of the ECG monitoring system are improved. The present invention solves the problems of battery life, comfort and convenience of traditional ECG monitoring systems through innovative energy collection and management technology, low-power design, high-precision ECG monitoring and wireless transmission technology, greatly improving the performance and user experience of the system. The system has broad application prospects and is suitable for medical health monitoring, telemedicine, sports health management and other fields.

[0059] Reference Figure 5 The embodiment of the present invention provides a control method for a low-power wearable ECG monitoring system, which is used to be executed by the above-mentioned low-power wearable ECG monitoring system, and includes the following steps:

[0060] S101, converting mechanical energy generated by the user's movement into electrical energy through a foot piezoelectric energy harvesting device;

[0061] S102, converting solar energy in a lighting environment into electrical energy through a back photovoltaic energy collection device;

[0062] S103, stabilizing and collecting the electric energy collected by the sole piezoelectric energy collection device and the back photovoltaic energy collection device through a micro energy collection unit;

[0063] S104, storing and outputting the electric energy collected by the micro energy collection unit through the energy control management unit, thereby providing electric energy for the electrocardiogram signal monitoring module;

[0064] S105 , collecting the user's ECG signal through the ECG signal monitoring module and processing it to obtain ECG monitoring data.

[0065] As an optional implementation, the energy control management unit includes an energy classification storage module, a timer chip, a DC-DC chip and a threshold judgment module, which stores and outputs the electric energy collected by the micro energy collection unit, which specifically includes:

[0066] S1041, hierarchically storing the electric energy collected by the micro energy collection unit through an energy hierarchical storage module;

[0067] S1042, outputting a high level signal to the enable terminal of the DC-DC chip according to a preset time interval through the timer chip;

[0068] S1043, when the voltage of the energy grading storage module reaches a preset threshold, the output end of the energy grading storage module is connected to the voltage input end of the DC-DC chip through the threshold judgment module;

[0069] S1044. When a high-level signal is input to the enable end of the DC-DC chip and the voltage input end of the DC-DC chip is connected to the output end of the energy grading storage module, the DC-DC chip performs voltage conversion on the electric energy output by the energy grading storage module and provides it to the ECG signal monitoring module.

[0070] It can be understood that the contents of the above system embodiments are all applicable to the present method embodiments, the functions specifically implemented by the present method embodiments are the same as those of the above system embodiments, and the beneficial effects achieved are also the same as those achieved by the above system embodiments.

[0071] It should be appreciated that embodiments of the present invention may be implemented or enforced by computer hardware, a combination of hardware and software, or by computer instructions stored in a non-transitory computer-readable memory. The above methods may be implemented in a computer program using standard programming techniques, including a non-transitory computer-readable storage medium configured with a computer program, wherein the storage medium so configured causes the computer to operate in a specific and predefined manner, according to the methods and drawings described in the specific embodiments. Each program may be implemented in a high-level procedural or object-oriented programming language to communicate with a computer system. However, if desired, the program may be implemented in an assembly or machine language. In any case, the language may be a compiled or interpreted language. In addition, the program may be run on a programmed dedicated integrated circuit for this purpose.

[0072] Furthermore, the operations of the processes described herein may be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The processes described herein (or variations and / or combinations thereof) may be performed under the control of one or more computer systems configured with executable instructions, and may be implemented as code (e.g., executable instructions, one or more computer programs, or one or more applications) that is executed collectively on one or more processors, by hardware, or a combination thereof. The computer programs described above include a plurality of instructions that may be executed by one or more processors.

[0073] Further, the above method can be implemented in any type of computing platform that is operably connected to a suitable computer, including but not limited to a personal computer, a minicomputer, a mainframe, a workstation, a network or distributed computing environment, a separate or integrated computer platform, or in communication with a charged particle tool or other imaging device, etc. Various aspects of the present invention can be implemented in machine-readable code stored on a non-transitory storage medium or device, whether removable or integrated into a computing platform, such as a hard disk, an optical read and / or write storage medium, a RAM, a ROM, etc., so that it can be read by a programmable computer, and when the storage medium or device is read by the computer, it can be used to configure and operate the computer to perform the process described herein. In addition, the machine-readable code, or a portion thereof, can be transmitted via a wired or wireless network. When such media includes instructions or programs that implement the steps described above in conjunction with a microprocessor or other data processor, the invention described herein includes these and other different types of non-transitory computer-readable storage media. When programmed according to the methods and techniques described in the present invention, the present invention also includes the computer itself.

[0074] The computer program can be applied to input data to perform the functions described herein, thereby converting the input data to generate output data stored in a non-volatile memory. The output information can also be applied to one or more output devices such as a display. In a preferred embodiment of the present invention, the converted data represents physical and tangible objects, including specific visual depictions of physical and tangible objects produced on the display.

[0075] The above is only a preferred embodiment of the present invention. The present invention is not limited to the above implementation. As long as the technical effect of the present invention is achieved by the same means, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of protection of the present invention. Within the scope of protection of the present invention, its technical scheme and / or implementation method may have various modifications and changes.

Claims

1. A low-power wearable ECG monitoring system, characterized in that: It includes a piezoelectric energy harvesting device on the sole of the foot, a photovoltaic energy harvesting device on the back, a power management module and an ECG signal monitoring module, wherein: The power management module includes a micro energy collection unit and an energy control management unit. The output end of the plantar piezoelectric energy collection device and the output end of the back photovoltaic energy collection device are both connected to the input end of the micro energy collection unit, and the output end of the micro energy collection unit is connected to the input end of the energy control management unit. The energy control management unit is electrically connected to the electrocardiogram signal monitoring module. The plantar piezoelectric energy collection device can be worn on the sole of the user's foot, and is used to convert the mechanical energy generated by the user's movement into electrical energy. The back photovoltaic energy collection device can be worn on the user's back, and is used to convert solar energy in a lighting environment into electrical energy. The micro energy collection unit is used to stabilize and collect the electrical energy collected by the plantar piezoelectric energy collection device and the back photovoltaic energy collection device. The energy control management unit is used to store and output control the electrical energy collected by the micro energy collection unit. The electrocardiogram signal monitoring module is used to collect the user's electrocardiogram signal and process it to obtain electrocardiogram monitoring data.

2. A low-power wearable ECG monitoring system according to claim 1, characterized in that: The plantar piezoelectric energy harvesting device comprises a bicrystalline silicon circular piezoelectric sheet and a first energy output interface, and the bicrystalline silicon circular piezoelectric sheet is connected to the input end of the micro energy collection unit through the first energy output interface.

3. A low-power wearable ECG monitoring system according to claim 1, characterized in that: The back photovoltaic energy collection device includes a flexible amorphous silicon solar panel and a second energy output interface, and the flexible amorphous silicon solar panel is connected to the input end of the micro energy collection unit through the second energy output interface.

4. A low-power wearable ECG monitoring system according to claim 1, characterized in that: The micro energy collection unit includes a full-wave rectifier module, a piezoelectric energy collection chip and a photovoltaic energy collection chip. The output end of the plantar piezoelectric energy collection device is connected to the input end of the full-wave rectifier module, the output end of the full-wave rectifier module is connected to the input end of the piezoelectric energy collection chip, the output end of the piezoelectric energy collection chip is connected to the input end of the energy control management unit, the output end of the back photovoltaic energy collection device is connected to the input end of the photovoltaic energy collection chip, and the output end of the photovoltaic energy collection chip is connected to the input end of the energy control management unit.

5. A low-power wearable ECG monitoring system according to claim 1, characterized in that: The energy control management unit includes an energy grading storage module, a timer chip, a DC-DC chip and a threshold judgment module. The input end of the energy grading storage module is connected to the output end of the micro energy collection unit, the output end of the energy grading storage module is connected to the voltage input end of the DC-DC chip through the threshold judgment module, the output end of the timer chip is connected to the enable end of the DC-DC chip, and the output end of the DC-DC chip is electrically connected to the electrocardiogram signal monitoring module. The energy grading storage module is used to perform hierarchical storage on the electric energy collected by the micro energy collection unit, the timer chip is used to output a high level signal to the enable end of the DC-DC chip according to a preset time interval, and the threshold judgment module is used to connect the output end of the energy grading storage module to the voltage input end of the DC-DC chip when the voltage of the energy grading storage module reaches a preset threshold, and the DC-DC chip is used to perform voltage conversion on the electric energy output by the energy grading storage module and provide it to the electrocardiogram signal monitoring module.

6. A low-power wearable ECG monitoring system according to claim 5, characterized in that: The energy hierarchical storage module includes a first super capacitor, a second super capacitor, a third super capacitor, a fourth super capacitor, a first PMOS tube, a second PMOS tube, a third PMOS tube, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor. The capacities of the first super capacitor, the second super capacitor, the third super capacitor and the fourth super capacitor increase in sequence. The positive electrode of the first super capacitor and the source electrode of the first PMOS tube are both connected to the output end of the micro energy collection unit, the positive electrode of the second super capacitor and the source electrode of the second PMOS tube are both connected to the drain electrode of the first PMOS tube, the positive electrode of the third super capacitor and the source electrode of the third PMOS tube are both connected to the drain electrode of the second PMOS tube, and the The positive electrode of the fourth super capacitor is connected to the drain of the third PMOS tube, the gate of the first PMOS tube is connected to one end of the first resistor, the gate of the second PMOS tube is connected to one end of the second resistor, the gate of the third PMOS tube is connected to one end of the third resistor, the negative electrode of the first super capacitor, the negative electrode of the second super capacitor, the negative electrode of the third super capacitor, the negative electrode of the fourth super capacitor, the other end of the first resistor, the other end of the second resistor and the other end of the third resistor are all grounded, the fourth resistor is connected between the source and the gate of the first PMOS tube, the fifth resistor is connected between the source and the gate of the second PMOS tube, and the sixth resistor is connected between the source and the gate of the third PMOS tube.

7. A low-power wearable ECG monitoring system according to claim 1, characterized in that: The ECG signal monitoring module includes three-lead electrodes, an ECG signal acquisition chip, a main control chip and a data transmission unit. The input end of the ECG signal acquisition chip is connected to the three-lead electrodes, the output end of the ECG signal acquisition chip is connected to the input end of the main control chip, the main control chip is signal-connected to the data transmission unit, the ECG signal acquisition chip and the main control chip are both electrically connected to the energy control management unit, the three-lead electrodes are used to acquire the user's ECG signals, the ECG signal acquisition chip is used to amplify and filter the user's ECG signals, and the main control chip is used to transmit the ECG monitoring data to a host computer through the data transmission unit.

8. A low-power wearable ECG monitoring system according to claim 7, characterized in that: The electrocardiogram signal acquisition chip is an AD8232 chip, the main control chip is an STM32L151C8T6 chip, and the data transmission unit is a DX-BT24 Bluetooth module.

9. A control method for a low-power wearable ECG monitoring system, for execution by the low-power wearable ECG monitoring system according to any one of claims 1 to 8, characterized in that: The following steps are involved: The mechanical energy generated by the user's movement is converted into electrical energy through the foot piezoelectric energy harvesting device; The solar energy in the lighting environment is converted into electrical energy through the back photovoltaic energy collection device; The electric energy collected by the foot piezoelectric energy collection device and the back photovoltaic energy collection device is stabilized and collected by the micro energy collection unit; The energy control management unit is used to store and output the electric energy collected by the micro energy collection unit, thereby providing electric energy for the electrocardiogram signal monitoring module; The ECG signal monitoring module collects the user's ECG signal and processes it to obtain ECG monitoring data.

10. A control method for a low-power wearable electrocardiogram monitoring system, characterized in that: The energy control management unit includes an energy classification storage module, a timer chip, a DC-DC chip and a threshold judgment module, and the storage and output control of the electric energy collected by the micro energy collection unit specifically includes: The electric energy collected by the micro energy collection unit is stored in a hierarchical manner through the energy hierarchical storage module; Outputting a high level signal to the enable terminal of the DC-DC chip according to a preset time interval through the timer chip; When the voltage of the energy grading storage module reaches a preset threshold, the output end of the energy grading storage module is connected to the voltage input end of the DC-DC chip through the threshold judgment module; When a high-level signal is input to the enable end of the DC-DC chip and the voltage input end of the DC-DC chip is connected to the output end of the energy grading storage module, the DC-DC chip performs voltage conversion on the electric energy output by the energy grading storage module and provides it to the electrocardiogram signal monitoring module.

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