CN115767459A - A flexible and wearable wireless sensor system - Google Patents

Abstract

The invention discloses a self-powered flexible wearable wireless sensing system, which belongs to the technical field of flexible wearable physiological monitoring equipment. The system realizes the close fit of the flexible wearable equipment and the skin of each part of the human body, reduces the foreign body sensation of a user, and can detect more human body sign data.

Description

A flexible and wearable wireless sensor system

technical field

The invention belongs to the technical field of flexible wearable devices, and in particular relates to a flexible wearable wireless sensor system.

Background technique

In recent years, with the continuous improvement of people's living standards, people pay more and more attention to their own health problems, and with the rapid development of smart phones and low-power short-distance wireless communication technologies, there have been real-time detection of human physiological indicators in the market. Smart wearable devices, these wearable devices play an important role in health care, disease prediction, and human-computer interaction.

However, the current wearable devices are almost all made of traditional non-flexible materials, so they cannot be kept in close contact with the skin of the human body, causing the user to have an obvious foreign body sensation, resulting in low wearability and limited wearing range. It is relatively small, which limits the types of human body signs that it can detect.

Contents of the invention

In view of this, the present invention provides a flexible wearable wireless sensor system. The flexible wearable wireless sensor system utilizes flexible electronic technology to embed wireless sensor nodes in a flexible substrate to realize the connection between flexible wearable devices and the human body. The tight fit of the skin everywhere reduces the user's foreign body sensation and can detect more human body sign data.

The present invention adopts following technical scheme:

A flexible wearable wireless sensor system, the system includes a flexible substrate and a wireless sensor network;

The flexible substrate can be attached to human skin;

The wireless sensor network includes wireless sensor nodes, which are embedded in the flexible substrate and used to collect human body sign data.

Further, the wireless sensor node includes a sensor module, a processor module, a communication module and a power supply module;

The sensor module can collect data of human body signs, and send the collected data of human body signs to the processor module;

The processor module is capable of processing and analyzing the received body sign data, and sending the processed and analyzed body sign data to the communication module;

The communication module can send the received physical sign data to a terminal in the wireless sensor network;

The power supply module is used to supply power to the sensor module, the processor module and the communication module.

Further, the sensor module can also collect the speed and acceleration of human body movement.

Further, the power supply module is a solar power supply module, a piezoelectric power supply module or a thermoelectric power supply module.

Further, the solar power module includes a flexible solar panel;

The flexible solar panel can be arranged on the flexible substrate close to the chest, back, calf or arm.

Further, the piezoelectric power supply module includes a miniature pressure generator;

The micro pressure generator is arranged on the flexible substrate close to the joints of the human body, and can generate electric energy through the movement of the joints of the human body.

Further, the thermoelectric power supply module includes a flexible thermoelectric generation sheet;

The temperature difference between the human skin and the air around the human body makes the flexible thermoelectric generating sheet generate electric energy.

Further, the power module also includes a flexible supercapacitor;

The flexible supercapacitor can store the electric energy generated by the solar power module, the thermoelectric power module or the piezoelectric power module.

Further, the power supply module, the piezoelectric power supply module or the thermoelectric power supply module all use a maximum power point tracking algorithm to charge the flexible supercapacitor.

Further, the wireless sensor network also includes a data perception layer, a network transport layer, a relay layer and an application service layer;

The data perception layer includes the sensor module, the processor module and the communication module, which are used to collect and process the human body sign data;

The network transport layer includes BLE and Zigbee networks for realizing wireless communication between the data perception layer and the relay layer;

The relay layer includes a mobile device capable of manipulating the data perception layer in real time and uploading the human body sign data to the application service layer in real time;

The application service layer includes a server capable of storing the received human physiological sign data.

Beneficial effect:

1. The flexible substrate can closely adhere to the skin of the human body, reduce the foreign body sensation of the user when using it, and can be worn on various parts of the human body as needed, so that the wireless sensor nodes embedded in the flexible substrate can collect blood oxygen, Various physical signs data including ECG, heart rate and body temperature.

2. In addition to collecting physiological sign data such as blood oxygen, ECG, heart rate and body temperature, the sensor module can also collect the speed and acceleration of human body movement, so that the wireless sensor system can be applied to medical rehabilitation and big data motion analysis and other fields .

3. The power supply module includes a solar power supply module, a piezoelectric power supply module and a thermoelectric power supply module, which enables the wearable wireless sensor system to achieve self-supply and no additional power supply is required, thereby improving the reliability of real-time monitoring of human body sign data.

4. The flexible solar panel can be placed on the flexible substrate close to the chest, back, calf or arm, so that the wearable wireless sensor system can make full use of green and renewable solar energy for power supply.

5. The micro pressure generator is set on the flexible substrate close to the joints of the human body, which can generate electric energy through the movement of the human body joints, so that the human body can also provide electric energy to the wearable wireless sensor system during walking or running.

6. The temperature difference power supply module includes a flexible thermoelectric power generation sheet, so that the temperature difference between the human skin and the air around the human body can also make the flexible thermoelectric generation sheet generate electricity. In this way, even in cloudy days and when the human body is in a non-moving state, the wearable wireless The sensing system can also be self-powered.

7. The power module is equipped with a flexible supercapacitor. The flexible supercapacitor can store the electric energy generated by the solar power module, thermoelectric power module and piezoelectric power module. In this way, the stability of the three-in-one self-energy supply of the wearable wireless sensor system is further improved. and reliability.

8. The relay layer in the wireless sensor network includes mobile devices that can control the data perception layer in real time, so that the operation of the user is facilitated, and the relay layer can upload the physical signs data obtained by the data perception layer to the application service layer in real time , and then be able to carry out long-term and large-capacity storage, and provide big data support for related scientific research activities.

Description of drawings

Fig. 1 is a schematic diagram of a network structure of a flexible wearable wireless sensor system in an embodiment of the present invention;

Fig. 2 is a schematic diagram of the hardware circuit principle of the wireless sensor node in Fig. 1;

Fig. 3 is the equivalent circuit diagram of photovoltaic power generation;

Fig. 4 is the simulation characteristic curve of flexible solar panel in the embodiment of the present invention;

Fig. 5 is a schematic diagram of the energy supply principle of the solar power module in the implementation of the present invention.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and examples.

As shown in Figures 1 to 5, a flexible and wearable wireless sensor system includes a flexible substrate and a wireless sensor network, in which:

The flexible substrate can be attached to the human skin (the flexible substrate can be made into the shape of clothing, insoles, etc., and can be cut according to actual needs); the wireless sensor network includes wireless sensor nodes, which are embedded in the flexible substrate to collect human body information. Sign data, specifically, it can collect human body sign data including blood oxygen, ECG, heart rate and body temperature.

In this way, the flexible substrate can be kept in close contact with the skin of the human body, reducing the foreign body sensation of the user when using it, and can be worn on various parts of the human body as needed, so that the wireless sensor nodes embedded in the flexible substrate can collect data including blood oxygen, Various physical signs data including ECG, heart rate and body temperature.

Specifically, from the perspective of the functional modules of the wireless sensor node, it includes a sensor module, a processor module, a communication module, and a power supply module, wherein the sensor module can collect human body sign data and send the collected human body sign data to the processor module The processor module (CC2652R is selected in this embodiment) can process and analyze the received human body sign data, and send the processed and analyzed human body sign data to the communication module; the communication module can send the received human body sign data to the wireless sensor network Terminals (such as mobile phones, computers and servers, etc.); the power supply module can supply power to the sensor module, processor module and communication module.

More specifically, as shown in Figure 2, from the perspective of the hardware circuit of the wireless sensor node, it includes a human physiological sign detection circuit, a 2.4GHz radio frequency circuit, a power supply circuit, a display circuit, a button circuit, a main control MCU circuit and a reset circuit, Among them, the human physiological sign detection node circuit is used for real-time collection of human physiological sign data, specifically including an electrocardiographic detection circuit for collecting human heart rate data, a heart rate detection circuit for collecting human heart rate data, and a heart rate detection circuit for collecting human body temperature. The data body temperature detection circuit also includes a motion state detection circuit for collecting acceleration and angular velocity data of the human body; a 2.4GHz radio frequency circuit is used to realize the conversion of electromagnetic wave signals and digital signals, and complete the receiving and sending of data in the main control MCU circuit; The power supply circuit is used to provide power to the sensor module, processor module and communication module in the wireless sensor node; the display circuit is used to display the real-time status of human physiological signs, which is convenient for observing the status of the current detection node; the button circuit is used to realize the user Control of wireless sensor nodes; the main control MCU circuit is used to receive the instructions sent by the mobile terminal in real time. For example, when the MCU receives the data collection instruction sent by the mobile terminal, it starts the data collection task and transmits the collected data in real time through Bluetooth. sent to the mobile terminal, when the MCU receives the command to close the collection sent by the mobile terminal, the wireless sensor node closes all signal collection tasks and enters a low power consumption state. Control and data acquisition, and then control the ADC (analog-to-digital conversion chip) peripherals to obtain the output signal of the vital signs detection circuit; the reset circuit is used to reset the program and initialize the data of the main control MCU circuit. It should be noted that each of the above hardware circuits is a flexible circuit.

As shown in Figure 1, the wireless sensor network specifically includes a data perception layer, a network transport layer, a relay layer, and an application service layer. The data perception layer includes the above-mentioned sensor module, processor module, and communication module. And process the data of human body signs, specifically, the data collected by the ECG detection circuit is transmitted to the mobile terminal through the BLE protocol, and the data collected by the heart rate detection circuit, body temperature detection circuit and exercise state detection circuit are all transmitted to the mobile terminal through the Zigbee protocol. In this way, different types of data collected are transmitted through a suitable network, and the fusion of two protocols is used to solve the problem that the size and frequency of data packets to be transmitted are not fixed; the network transmission layer includes BLE and Zigbee networks, It is used to realize the wireless communication between the data perception layer and the relay layer; the relay layer includes mobile devices, which can control the data perception layer in real time, and can upload the data of human body signs to the application service layer in real time, so that it is convenient to use The operation of personnel; the application service layer includes a server, which can store the received data of human physiological signs, and then can store the data of human physical signs for a long time and in large capacity, and provide big data support for relevant scientific research activities. Moreover, in this embodiment Among them, the application service layer uses the TCP transmission protocol, and the service layer and the corresponding mobile device use 4G, 5G or wifi network for long-distance communication, which has the advantages of fast data transmission speed and large data transmission volume.

More specifically, in this implementation, the mobile terminal in the wireless sensor network adopts a cross-platform mobile design scheme, and uses the Unity game engine as a development tool. The relay layer is used to realize the real-time visualization and real-time upload of the human body sign data to the application service layer, and the application service layer is used to realize the persistent application of the human body sign data uploaded by the relay layer, that is, the transmission network transmits the data to the company terminal The server performs data backup and archiving for persistent applications. For example, the collected data can be used for a series of scientific research or convenience services such as big data medical treatment and big data motion analysis.

It can be seen that the wireless sensor network structure is mainly four-layer structure: data perception layer, network transmission layer, relay layer and application service layer. The application service layer adopts the integration of BLE and Zigbee protocols, and combines mobile terminal technology and Internet service technology to form a wireless sensor system network structure integrating collection, low-power wireless transmission, real-time visualization and cloud storage.

In this embodiment, the power supply module is a solar power supply module, a piezoelectric power supply module or a thermoelectric power supply module. In this way, the wearable wireless sensor system realizes self-supply, and no additional power supply is needed, thereby improving the real-time performance of human body sign data. The reliability of supervision realizes the use of ubiquitous energy for power supply, making the flexible wearable wireless sensor system self-sufficient in energy, and solves the problem that flexible wearable devices cannot carry a large number of charging devices when they are in use, the energy of wireless sensor nodes is limited, and the standby time is short. The problem,

Wherein, the above-mentioned solar power module includes a flexible solar panel, and the flexible solar panel can be arranged on the flexible substrate close to the chest, back, calf or arm, so that the wearable wireless sensor system can make full use of Powered by green renewable solar energy. Specifically, solar power generation is a technology that directly converts solar energy into electrical energy by using the photovoltaic effect of photovoltaic semiconductor materials. The solar power generation model can use the equivalent modeling of a diode connected in parallel with a current source. However, due to the photovoltaic module itself Internal resistance and leakage resistance and other factors, the actual model needs to introduce a parallel high resistance Rsh and a series low resistance Rs, Figure 3 shows the equivalent circuit diagram of photovoltaic power generation. Perform MATLAB simulation on the flexible solar panel to obtain the characteristic curve in Figure 4, and then select the perturbation and observation method as the maximum power point tracking algorithm for the characteristic curve of the flexible solar panel, and select SEPIC transformation after a detailed analysis of its principle The circuit acts as an equivalent load for the maximum power point tracking algorithm. Fig. 5 shows a schematic diagram of the energy supply principle of the solar power module in the flexible wearable wireless sensor system.

The above-mentioned piezoelectric power supply module includes a miniature pressure generator, which is arranged on the flexible substrate close to the joints of the human body, and can generate electric energy through the movement of the joints of the human body. The wearable wireless sensing system provides power.

The above-mentioned temperature difference power supply module is based on the Seebecker effect to realize the conversion of thermal energy into electrical energy, and specifically includes a flexible thermoelectric power generation sheet. The temperature difference between the human skin and the air around the human body makes the flexible thermoelectric generation sheet generate electrical energy. In addition, ceramic thermoelectric generating sheets can also be selected to be combined with the clothing worn (installed on the chest, abdomen or legs) to provide electrical energy. In this way, the wearable wireless sensing system can be self-powered even on cloudy days and when the human body is in a non-moving state.

Moreover, the power module of this embodiment is also equipped with a flexible supercapacitor, which can store the electric energy generated by the solar power module, thermoelectric power module and piezoelectric power module, thus further improving the three-in-one wearable wireless sensor system. 1. Stability and reliability of self-supply.

To sum up, the above are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. A flexible wearable wireless sensing system is characterized by comprising a flexible substrate and a wireless sensor network;

the flexible substrate can be attached to the skin of a human body;

the wireless sensor network comprises wireless sensor nodes, and the wireless sensor nodes are embedded in the flexible substrate and used for collecting human body sign data.

2. The flexible wearable wireless sensing system of claim 1, wherein the wireless sensor node comprises a sensor module, a processor module, a communication module, and a power module;

the sensor module can collect human body sign data and send the collected human body sign data to the processor module;

the processor module can process and analyze the received human body sign data and send the processed and analyzed human body sign data to the communication module;

the communication module can send the received human body sign data to a terminal in the wireless sensor network;

the power module is used for supplying power for the sensor module, the processor module and the communication module.

3. The flexible wearable wireless sensing system of claim 2, wherein the sensor module is further capable of acquiring velocity and acceleration of human body movement.

4. The flexible wearable wireless sensing system of claim 2, wherein the power module is a solar power module, a piezoelectric power module, or a temperature differential power module.

5. The flexible wearable wireless sensing system of claim 4, wherein the solar power module comprises a flexible solar panel;

the flexible solar cell panel can be disposed on the flexible substrate at a location proximate to the chest, back, lower leg, or arm.

6. The flexible wearable wireless sensing system of claim 4, wherein the piezoelectric power module comprises a miniature pressure generator;

the miniature pressure type generator is arranged at the position, close to the human joint, of the flexible substrate, and can generate electric energy through the motion of the human joint.

7. The flexible wearable wireless sensing system of claim 4, wherein the thermoelectric power module comprises a flexible thermoelectric power generation sheet;

the temperature difference between the human skin and the air around the human body enables the flexible thermoelectric power generation piece to generate electric energy.

8. The flexible wearable wireless sensing system of claim 4, wherein the power module further comprises a flexible supercapacitor;

the flexible super capacitor can store electric energy generated by the solar power module, the temperature difference power module or the piezoelectric power module.

9. The flexible wearable wireless sensing system of claim 4, wherein the power module, the piezoelectric power module, or the thermoelectric power module each use a maximum power point tracking algorithm to charge the flexible supercapacitor.

10. The flexible wearable wireless sensing system according to any one of claims 1-9, wherein the wireless sensor network further comprises a data awareness layer, a network transport layer, a relay layer, and an application service layer;

the data perception layer comprises the sensor module, the processor module and the communication module and is used for acquiring and processing the human body sign data;

the network transmission layer comprises BLE and Zigbee networks and is used for realizing wireless communication between the data perception layer and the relay layer;

the relay layer comprises mobile equipment, can control the data perception layer in real time, and can upload the human body sign data to the application service layer in real time;

the application service layer comprises a server and can store the received human body physiological sign data.

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