A wearable smart body temperature measurement device

Abstract

The utility model relates to intelligent body temperature measurement technical field, especially a wearable intelligent body temperature measurement device, including bracelet body and watchband, the bracelet body includes the shell, the chamber is opened in the shell, be equipped with PCB board in the chamber, integrate rectifier circuit, super capacitor, lithium cell and communication module on the PCB board, be equipped with heat power generation unit below the chamber, the output end of heat power generation unit is connected to the input of rectifier circuit, the output of rectifier circuit is linked with super capacitor, the positive pole of super capacitor is accessed power input end of communication module with lithium cell, super capacitor still accesses the charging loop of lithium cell.

Description

Technical Field

[0001] This utility model relates to the field of intelligent body temperature measurement technology, and in particular to a wearable intelligent body temperature measurement device. Background Technology

[0002] With the popularization of smart wearable devices, body temperature monitoring devices have been widely used in the field of health management. Existing body temperature measurement devices are mainly divided into two categories: one is traditional contact thermometers, such as mercury thermometers and electronic thermometers; the other is smart body temperature monitoring devices based on wearable devices, such as smart bracelets and smartwatches. For example, the utility model patent with publication number CN213364078U – a wireless thermometer based on a Bluetooth module. However, the inventors of this application have found the following problems in practical applications of the above-mentioned prior art: Existing smart body temperature measurement devices usually rely on lithium batteries for power. Although lithium battery technology is relatively mature, in scenarios of continuous body temperature monitoring, the device's battery life is still insufficient to meet the needs of long-term use. Especially in the scenario of children's body temperature monitoring, frequent battery replacement or charging may affect the user experience and even lead to monitoring interruption; Smart body temperature measurement devices usually need to communicate with terminal devices such as mobile phones via Bluetooth or Wi-Fi modules to transmit body temperature data in real time. However, the communication module requires a large current pulse at startup or data transmission, and lithium batteries are prone to voltage drops under high load, leading to communication interruption or data loss. Summary of the Invention

[0003] In view of the above-mentioned prior art, the present invention provides a wearable intelligent body temperature measurement device, which mainly solves the technical problems existing in the background art.

[0004] To achieve the above objectives, the technical solution of this utility model embodiment is implemented as follows:

[0005] A wearable smart body temperature measurement device includes a wristband body and a strap. The wristband body includes a shell with a cavity inside. A PCB board is installed in the cavity. A rectifier circuit, a supercapacitor, a lithium battery, and a communication module are integrated on the PCB board. A thermoelectric power generation unit is located below the cavity. The output terminal of the thermoelectric power generation unit is connected to the input terminal of the rectifier circuit. The output terminal of the rectifier circuit is connected to the supercapacitor. The positive terminal of the supercapacitor and the lithium battery are connected to the power input terminal of the communication module. The supercapacitor is also connected to the charging circuit of the lithium battery.

[0006] Optionally, the thermoelectric power generation unit includes a heat sink, a thermoelectric element, and a heat-conducting element. The hot end of the thermoelectric element is connected to the inner surface of the heat-conducting element through thermally conductive adhesive. The outer surface of the heat-conducting element is in contact with human skin. Heat sinks are connected to both sides of the cold end of the thermoelectric element. The heat sinks are connected to the side wall of the outer casing.

[0007] Optionally, the sidewalls of the housing are made of a metallic material.

[0008] Optionally, the wristband body also includes a bottom cover, in which the heat-conducting sheet and temperature sensor are embedded, and the heat-conducting sheet and temperature sensor are in contact with human skin through thermally conductive silicone.

[0009] Optionally, the temperature sensor is located away from the heat-conducting sheet on the bottom cover.

[0010] Optionally, the rectifier circuit includes an active rectifier bridge composed of a first JFET device and a second JFET device. The positive terminal of the thermoelectric element is connected to the source of the first JFET device, and the negative terminal of the thermoelectric element is connected to the drain of the second JFET device. The drain of the first JFET device and the source of the second JFET device are connected to the positive terminal of the supercapacitor.

[0011] Optionally, the supercapacitor is connected to the charging circuit of the lithium battery via a current-limiting resistor R1 and a diode D1 connected in series.

[0012] Optionally, the PCB board also integrates a central controller, which is electrically connected to the temperature sensor and the communication unit respectively.

[0013] Optionally, a touch screen is fixedly connected to the upper end of the housing, and the touch screen is connected to the central controller.

[0014] The beneficial effects of this utility model are as follows: The body temperature detection device in this application monitors the child's body temperature in real time through a temperature sensor. The human body temperature output collected by the temperature sensor is transmitted to the central controller. When the device establishes a communication connection with the parent's mobile terminal through the communication unit, the corresponding temperature data is sent to the parent's mobile terminal, making it convenient for the parent to understand the child's dynamic body temperature. Secondly, the thermal power generation unit continuously generates electricity using the temperature difference between the child's body temperature and the ambient temperature (ΔT≥1℃). After conversion by the rectifier circuit, the electricity is preferentially stored in the supercapacitor. The positive terminal of the supercapacitor is directly connected to the power input terminal of the communication module, which can provide a large current pulse at the moment of communication module startup or data transmission, avoiding communication interruption caused by voltage drop. Furthermore, it can charge the lithium battery when the supercapacitor is fully charged, thereby improving the overall battery life and stability of the body temperature measurement device. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the ring body in the embodiments of this application;

[0016] Figure 2 This is a schematic diagram showing the circuit connection between the rectifier circuit, the supercapacitor, and the lithium battery in the embodiments of this application;

[0017] Figure 3 This is a schematic diagram of the bottom of the bottom cover in an embodiment of this application.

[0018] Explanation of icon numbers:

[0019] 1. Housing; 2. Chamber; 3. PCB board; 4. Rectifier circuit; 5. Supercapacitor; 6. Lithium battery; 7. Communication module; 8. Heat sink; 9. Thermoelectric element; 10. Thermal conductive sheet; 11. Thermal conductive adhesive; 12. Bottom cover; 13. Temperature sensor; 14. Central controller; 15. Touch screen; 16. First JFET device; 17. Second JFET device. Detailed Implementation

[0020] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used in this specification of this utility model is for the purpose of describing particular embodiments only and is not intended to limit the utility model. In the following description, the expression "some embodiments" refers to a subset of all possible embodiments; however, it should be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments and can be combined with each other without conflict.

[0021] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with the present invention.

[0022] It should be understood that this invention can be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, providing these embodiments will make the disclosure thorough and complete, and will fully convey the scope of this invention to those skilled in the art. Furthermore, the terminology used herein is intended only to describe particular embodiments and is not intended to limit the invention. When used herein, the singular forms “a,” “an,” and “the” are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “compose” and / or “comprising,” when used in this specification, identify the presence of the stated features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups. When used herein, the term “and / or” includes any and all combinations of the associated listed items.

[0023] It should also be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "inner," "outer," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0024] To fully understand this utility model, a detailed structure will be presented in the following description to illustrate the technical solution proposed by this utility model. Optional embodiments of this utility model are described in detail below; however, in addition to these detailed descriptions, this utility model may have other embodiments.

[0025] Please refer to the attached document. Figures 1 to 3 This application provides a wearable smart body temperature measurement device, including a wristband body and a strap. The wristband body includes a shell 1, and a cavity 2 is opened in the shell 1. A PCB board 3 is provided in the cavity 2. A rectifier circuit 4, a supercapacitor 5, a lithium battery 6 and a communication module 7 are integrated on the PCB board 3. A thermoelectric power generation unit is provided below the cavity 2. The output terminal of the thermoelectric power generation unit is connected to the input terminal of the rectifier circuit 4. The output terminal of the rectifier circuit 4 is connected to the supercapacitor 5. The positive terminal of the supercapacitor 5 and the lithium battery 6 are connected to the power input terminal of the communication module 7. The supercapacitor 5 is also connected to the charging circuit of the lithium battery 6.

[0026] The wearable smart body temperature measuring device provided in this application is fixed to the wrist of a child user via a watchband. Both the watchband and the watchband are made of medical-grade silicone. After the wristband is worn, its thermal power generation unit and temperature sensor 13 are in close contact with the user's skin. The temperature sensor 13 monitors the child's body temperature in real time and sends the corresponding temperature data to the parent's mobile phone terminal after connecting to the communication module 7, so that the parent can know the child's dynamic body temperature. The thermal power generation unit continuously generates electricity using the temperature difference between the child's body temperature and the ambient temperature (ΔT≥1℃). After conversion by the rectifier circuit 4, the electricity is preferentially stored in the supercapacitor 5. The positive terminal of the supercapacitor 5 is directly connected to the power input terminal of the communication module 7, which can provide a large current pulse at the moment of communication module 7 startup or data transmission, avoiding communication interruption caused by voltage drop. Secondly, it can charge the lithium battery 6 when the supercapacitor 5 is fully charged, thereby improving the overall battery life of the body temperature measuring device.

[0027] Furthermore, the communication module 7 includes a Bluetooth communication module 7 and a WIFI communication module 7.

[0028] In an optional embodiment, the thermal power generation unit includes a heat sink 8, a thermoelectric element 9, and a heat-conducting element 10. The hot end of the thermoelectric element 9 is connected to the inner surface of the heat-conducting element 10 through thermally conductive adhesive 11. The outer surface of the heat-conducting element 10 is in contact with human skin. The heat sink 8 is connected to both sides of the cold end of the thermoelectric element 9. The heat sink 8 is connected to the side wall of the outer casing 1, and the side wall of the outer casing 1 is made of metal material.

[0029] Specifically, the heat-conducting sheet 10 serves as the hot end medium, with its outer surface directly adhering to human skin. Heat is efficiently transferred to the hot end surface of the thermoelectric sheet 9 via the highly thermally conductive adhesive 11, ensuring maximum heat capture. Based on the Seebeck effect, the thermoelectric sheet 9 generates a potential difference when a temperature gradient is formed between the hot end on the skin side and the cold end where the heat sink 8 is located, outputting a DC voltage proportional to the temperature difference. The heat sink 8, connected to both sides of the cold end, is made of porous aluminum-based composite material and is directly connected to the sidewall of the metal outer shell 1. The high thermal conductivity of the metal rapidly conducts heat from the cold end to the outside air, increasing the contact area with the ambient air and accelerating heat dissipation, further enhancing the heat dissipation capacity of the heat sink 8, reducing the temperature at the cold end, and improving power generation efficiency. The current generated by the thermoelectric sheet 9 flows into the supercapacitor 5 through the rectifier circuit 4.

[0030] In an optional embodiment, the rectifier circuit 4 includes an active rectifier bridge composed of a first JFET device 16 and a second JFET device 17. The positive terminal of the thermoelectric element 9 is connected to the source of the first JFET device 16, and the negative terminal of the thermoelectric element 9 is connected to the drain of the second JFET device 17. The drain of the first JFET device 16 and the source of the second JFET device 17 are connected together to the positive terminal of the supercapacitor 5.

[0031] When the thermoelectric element 9 generates an alternating current due to the temperature difference between the human body and the environment, the source of the first JFET device 16 receives the positive half-cycle signal and conducts under forward bias. The current flows along the source-drain path to the positive terminal of the supercapacitor 5. During the negative half-cycle, the polarity of the thermoelectric element 9 reverses, and the drain-source channel of the second JFET device 17 is automatically cut off due to reverse bias, while the first JFET device 16 is simultaneously turned off. At this time, the current forms a freewheeling path through the second JFET device 17, preventing energy backflow. Through the active conduction characteristics of the JFET device, the rectified voltage drop is reduced to below 50mV, significantly improving the energy capture efficiency under low temperature difference (ΔT≥1℃) conditions. The positive terminal of the supercapacitor 5 is directly connected to the output nodes of the first JFET device 16 and the second JFET device 17, allowing the rectified pulsating DC to be directly stored without additional filtering circuitry, reducing energy loss in intermediate stages. Furthermore, to address voltage instability caused by temperature fluctuations during children's daily activities, the high-frequency response characteristics of the active rectifier bridge composed of the first JFET device 16 and the second JFET device 17 can quickly follow the output polarity changes of the thermoelectric element 9, completing the conduction state switching within microseconds to ensure continuous energy injection into the supercapacitor 5. In addition, the negative temperature coefficient of the JFET devices can automatically compensate for the impact of ambient temperature changes on rectification efficiency. When the device heats up internally due to children's vigorous activity, the JFET on-resistance decreases, further optimizing energy transfer capabilities under high-temperature environments.

[0032] Furthermore, the wristband body also includes a bottom cover 12, in which the heat-conducting sheet 10 and the temperature sensor 13 are embedded. Both the heat-conducting sheet 10 and the temperature sensor 13 are in contact with human skin through thermally conductive silicone. The temperature sensor 13 is located away from the heat-conducting sheet 10 on the bottom cover 12, maintaining a physical distance of ≥5mm from the heat-conducting sheet 10 to avoid thermal interference when the thermoelectric element 9 is working.

[0033] Furthermore, the supercapacitor 5 is connected to the charging circuit of the lithium battery 6 via a current-limiting resistor R1 and a diode D1 connected in series. When the electrical energy generated by the thermoelectric power generation unit is rectified and stored in the supercapacitor 5, the voltage of the supercapacitor 5 gradually increases with energy accumulation. When its positive terminal voltage exceeds the sum of the lithium battery 6 voltage and the forward voltage drop of the diode, the charging circuit is turned on, and the supercapacitor 5 charges the lithium battery 6. The cathode of the diode D1 is connected to the positive terminal of the lithium battery 6, and its unidirectional conduction characteristic prevents the lithium battery 6 from discharging in reverse to the supercapacitor 5, ensuring that energy flows only in one direction. When the supercapacitor 5 experiences a sudden increase in load, such as when Bluetooth is activated causing a momentary voltage drop, the diode D1 is automatically turned off due to reverse bias. At this time, the lithium battery 6 does not participate in power supply, and the supercapacitor 5 independently handles the high transient current demand, maintaining the system voltage stability.

[0034] Furthermore, the PCB board 3 also integrates a central controller 14, which is electrically connected to the temperature sensor 13 and the communication unit. The human body temperature output collected by the temperature sensor 13 is transmitted to the central controller 14. When the device establishes a communication connection with the parent's mobile terminal through the communication unit, the corresponding temperature data is sent to the parent's mobile terminal, so that the parent can understand the child's dynamic body temperature.

[0035] Furthermore, a touch screen 15 is fixedly connected to the upper end of the outer shell 1. The touch screen 15 is connected to the central controller 14, and the wearer can operate and set the bracelet body through the function area on the touch screen 15.

[0036] It should be noted that the electronic components used in this device are all conventional and general-purpose devices in this field, without relying on specific models or customized components. The design of the parameters of each component follows general industry technical standards, and their selection only needs to meet basic electrical performance requirements. Functional adaptation can be achieved through conventional circuit design methods. The connection relationship and topology of the above-mentioned components are the core innovation of this solution. Their combination is not limited by specific models, and any similar standard device that meets the functional requirements can be substituted.

[0037] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. The protection scope of this utility model should be determined by the protection scope of the stated claims.

Claims

1. A wearable smart body temperature measurement device, comprising a wristband body and a strap, characterized in that, The bracelet body includes a shell with a cavity inside. A PCB board is installed in the cavity, and a rectifier circuit, a supercapacitor, a lithium battery, and a communication module are integrated on the PCB board. A thermoelectric power generation unit is installed below the cavity. The output terminal of the thermoelectric power generation unit is connected to the input terminal of the rectifier circuit. The output terminal of the rectifier circuit is connected to the supercapacitor. The positive terminal of the supercapacitor and the lithium battery are connected to the power input terminal of the communication module. The supercapacitor is also connected to the charging circuit of the lithium battery.

2. The wearable intelligent body temperature measuring device according to claim 1, characterized in that, The thermoelectric power generation unit includes a heat sink, a thermoelectric element, and a heat-conducting element. The hot end of the thermoelectric element is connected to the inner surface of the heat-conducting element through thermally conductive adhesive. The outer surface of the heat-conducting element is in contact with human skin. Heat sinks are connected to both sides of the cold end of the thermoelectric element. The heat sinks are connected to the side wall of the outer casing.

3. The wearable intelligent body temperature measuring device according to claim 1, characterized in that, The sidewalls of the outer casing are made of metal.

4. A wearable intelligent body temperature measuring device according to claim 2, characterized in that, The bracelet body also includes a bottom cover, in which the heat-conducting sheet and temperature sensor are embedded, and the heat-conducting sheet and temperature sensor are in contact with human skin through thermally conductive silicone.

5. A wearable intelligent body temperature measuring device according to claim 4, characterized in that, The temperature sensor is located away from the heat-conducting sheet on the bottom cover.

6. A wearable intelligent body temperature measuring device according to claim 2, characterized in that, The rectifier circuit includes an active rectifier bridge composed of a first JFET device and a second JFET device. The positive terminal of the thermoelectric element is connected to the source of the first JFET device, and the negative terminal of the thermoelectric element is connected to the drain of the second JFET device. The drain of the first JFET device and the source of the second JFET device are connected to the positive terminal of the supercapacitor.

7. A wearable intelligent body temperature measuring device according to claim 2, characterized in that, The supercapacitor is connected to the charging circuit of the lithium battery through a current-limiting resistor R1 and a diode D1 connected in series.

8. A wearable intelligent body temperature measuring device according to claim 4, characterized in that, The PCB board also integrates a central controller, which is electrically connected to the temperature sensor and the communication module.

9. A wearable intelligent body temperature measuring device according to claim 8, characterized in that, A touch screen is fixedly connected to the upper end of the housing, and the touch screen is connected to the central controller.

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