USB thermometer device

Abstract

A USB thermometer device is characterized in that the USB thermometer device comprises a thermometer body and a USB interface, and the thermometer body can detect the temperature and display the detected temperature in real time; the USB interface is fixedly arranged on the thermometer main body and is electrically connected with the thermometer main body; and the USB interface can be inserted into the USB interface socket to take electricity and supply power to the thermometer main body so as to display the detected temperature in real time. The USB thermometer device provided by the utility model is provided with the USB power supply unit and the USB interface, the USB interface can be inserted into the USB interface socket to take electricity and supply power to the thermometer, and the USB power supply is adopted, so that the power supply design can be simplified, the power supply is more convenient, and the purpose of using as required can be realized. The USB thermometer device has the advantages of being simple in structure, practical in function, convenient to use, high in practicability and suitable for being popularized vigorously.

Description

[Technical Field]

[0001] This application relates to thermometers, and more particularly to a USB thermometer device. [Background Technology]

[0002] Existing common electronic thermometers are typically powered by batteries, such as button batteries. For thermometers that need to continuously display temperature data in real time, battery power requires periodic battery replacement. Even with a low power consumption design, the battery still needs to be replaced periodically. Users don't always carry button batteries, often resulting in the inability to find a spare battery when needed, thus impacting the user experience. Therefore, existing battery-powered electronic thermometers need improvement in power supply maintenance to ensure they are readily available to users. Furthermore, the power supply circuitry of existing thermometers is relatively complex and still has room for improvement. [Utility Model Content]

[0003] The present invention aims to solve the above problems by providing a USB thermometer device that is powered by USB and can be used on demand.

[0004] To address the above problems, this utility model provides a USB thermometer device, characterized in that it comprises:

[0005] The thermometer body, which can detect temperature and display the detected temperature in real time;

[0006] A USB interface is fixedly mounted on the thermometer body and electrically connected to the thermometer body.

[0007] The USB interface can be inserted into a USB interface socket to draw power to the thermometer body so as to display the detected temperature in real time.

[0008] Furthermore, the USB interface is one of TYPE A, TYPE B, or TYPE C interfaces.

[0009] Furthermore, the thermometer body contains:

[0010] Main control unit

[0011] A temperature sensing unit, electrically connected to the main control unit, is used to detect temperature in real time;

[0012] An LED display unit is electrically connected to the main control unit and is used to display the detected temperature in real time under the control of the main control unit.

[0013] The USB interface is electrically connected to the main control unit via a USB power supply unit, thereby providing power to at least the main control unit.

[0014] Furthermore, the USB power supply unit includes a step-down diode D1 and filter capacitors C5 and C6;

[0015] The positive terminal of the step-down diode D1 is connected to the power pin VBUS of the USB interface, and the negative terminal is connected to the voltage pin VDD of the main control unit.

[0016] One end of the filter capacitors C5 and C6 is grounded, and the other end is connected to the negative terminal of the step-down diode D1.

[0017] The input voltage obtained by the USB interface from the USB interface socket is stepped down by the step-down diode D1 and then supplied to the main control unit for power supply.

[0018] Furthermore, the filter capacitor C5 has a capacitance of 4.7uF and is used for low-frequency filtering;

[0019] The filter capacitor C6 has a capacitance of 0.1uF and is used for high-frequency decoupling.

[0020] Furthermore, the temperature sensing unit includes a standard reference resistor R3, a thermistor RT, and an impedance measurement capacitor C4.

[0021] The standard reference resistor R3 and the impedance measurement capacitor C4 form the first RC network;

[0022] The thermistor RT and the impedance measurement capacitor C4 form a second RC network;

[0023] The main control unit can reverse-calibrate the actual capacitance value of the impedance measurement capacitor C4 by measuring the charge and discharge time constant of the first RC network.

[0024] The main control unit can calculate the real-time resistance of the thermistor RT by measuring the charge and discharge time constant of the second RC network and combining it with the actual capacitance value of the calibrated impedance measurement capacitor C4.

[0025] Furthermore, one end of the standard reference resistor R3 is connected to pin 1 PA4 of the main control unit, and the other end is connected to the first end of the impedance measurement capacitor C4;

[0026] One end of the thermistor RT is connected to pin 2 PA3 of the main control unit, and the other end is connected to the first end of the impedance measurement capacitor C4.

[0027] The second terminal of the impedance measuring capacitor C4 is grounded;

[0028] The main control unit obtains data from the temperature sensing unit through the first pin PA4 and the second pin PA3, and can calculate the temperature value based on the data.

[0029] Furthermore, the LED display unit includes two common cathode LED displays. The cathodes of the two LED displays are respectively connected to the two digit selection pins COM1 and COM2 of the main control unit. The positive terminals of the light-emitting diode units of each LED display are respectively connected to the seven or eight segment selection pins of the main control unit to multiplex the segment selection pins. The first LED display is used to display the ten digits of the temperature, and the second LED display is used to display the digits of the temperature.

[0030] Furthermore, the LED display unit also includes light-emitting diodes 3A, 3B, 3C, 3D, 3E, 3F, and 3G, whose negative terminals are connected to the bit selection pin COM3 of the main control unit, and whose positive terminals are connected to the seven segment selection pins of the main control unit and multiplexed with the segment selection pins of the digital tube; wherein, light-emitting diode 3A is used to display the symbol for negative temperature; light-emitting diode 3B is used to indicate the symbol for Celsius temperature; light-emitting diode 3C is used to indicate the symbol for Fahrenheit temperature; light-emitting diodes 3D and 3E are used to display the hundreds digit of the temperature as 1; light-emitting diodes 3F and 3G are flashing indicator lights used to indicate the operating status.

[0031] The beneficial contribution of this utility model lies in its effective solution to the aforementioned problems. The USB thermometer device of this utility model is equipped with a USB power supply unit and a USB interface. The USB interface can be inserted into a USB socket to draw power for the thermometer. Using USB power not only simplifies the power supply design but also makes power supply more convenient and accessible, achieving the goal of immediate use. Furthermore, this utility model simplifies the circuit structure of the temperature sensing unit and the LED display unit. The USB thermometer device of this utility model is characterized by its simple structure, practical function, and ease of use, making it highly practical and worthy of widespread promotion. [Attached Image Description]

[0032] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0033] Figure 2 This is a schematic diagram of the principle structure of this utility model.

[0034] Figure 3 This is the circuit diagram of the temperature sensing unit.

[0035] Figure 4 This is the circuit diagram of the main control unit.

[0036] Figure 5 This is the circuit diagram of the USB power supply unit.

[0037] Figure 6 This is the circuit diagram of the LED display unit.

[0038] The attached diagram shows: thermometer body 10, main control unit 11, temperature sensing unit 12, LED display unit 13, USB power supply unit 14, and USB interface 20.

Detailed Implementation Methods

[0039] The following embodiments are further explanations and supplements to the present invention and do not constitute any limitation on the present invention.

[0040] like Figures 1-6 As shown, the USB thermometer device of this utility model includes a thermometer body 10 and a USB interface 20. The USB body can detect temperature and display the detected temperature in real time. The USB interface 20 is fixedly mounted on the thermometer body 10 and electrically connected to the thermometer body 10. The USB interface 20 can be inserted into a USB interface 20 socket to draw power to the thermometer body 10 for real-time display of the detected temperature.

[0041] The USB thermometer of this application is powered by plugging into a corresponding USB port 20 socket via a USB interface 20, instead of the conventional battery power supply. It can be used immediately upon plugging in, without worrying about battery power. For example, it can be powered by plugging into a computer's USB port 20 socket or a mobile phone charger's USB port 20 socket. Since USB port 20 sockets are widely used, plugging in power via USB port 20 is very convenient, providing easy power supply and convenient use, achieving the goal of immediate use upon request.

[0042] The USB interface 20 can be one of TYPE A, TYPE B, or TYPE C interfaces. In this embodiment, the USB interface 20 is a TYPE A standard interface.

[0043] The shape of the thermometer body 10 can be set as needed. In this embodiment, the thermometer body 10 and the USB interface 20 are integrated into the shape of a USB flash drive, which can be easily plugged into an existing USB interface 20 socket for use to detect the ambient temperature in real time.

[0044] The thermometer body 10 is provided with a shell, and inside the shell are a main control unit 11, a temperature sensing unit 12, an LED display unit 13 and a USB power supply unit 14.

[0045] The temperature sensing unit 12 is electrically connected to the main control unit 11 and is used to detect the temperature in real time.

[0046] The LED display unit 13 is electrically connected to the main control unit 11 and is used to display the detected temperature in real time under the control of the main control unit 11.

[0047] The USB interface 20 is electrically connected to the main control unit 11 through the USB power supply unit 14, thereby supplying power to at least the main control unit 11.

[0048] Furthermore, the USB power supply unit 14 includes a step-down diode D1 and filter capacitors C5 and C6. The positive terminal of the step-down diode D1 is connected to the power supply pin VBUS of the USB interface 20, and the negative terminal is connected to the voltage pin VDD of the main control unit 11; the D+ and D- pins of the USB interface 20 are left floating, and the GND pin is grounded. One end of the filter capacitors C5 and C6 is grounded, and the other end is connected to the negative terminal of the step-down diode D1; the input voltage obtained by the USB interface 20 from the USB interface 20 socket is stepped down by the step-down diode D1 and then supplied to the main control unit 11 for power supply.

[0049] The step-down diode D1 also prevents reverse connection damage to the circuit. Capacitors C5 and C6 suppress power supply noise and ensure accurate sampling by the temperature sensing unit 12.

[0050] Furthermore, the filter capacitor C5 has a capacitance of 4.7uF and is used for low-frequency filtering; the filter capacitor C6 has a capacitance of 0.1uF and is used for high-frequency decoupling.

[0051] Furthermore, the temperature sensing unit 12 includes a standard reference resistor R3, a thermistor RT, and an impedance measurement capacitor C4. The standard reference resistor R3 and the impedance measurement capacitor C4 form a first RC network; the thermistor RT and the impedance measurement capacitor C4 form a second RC network; the main control unit 11 can reverse-calibrate the actual capacitance value of the impedance measurement capacitor C4 by measuring the charge and discharge time constant of the first RC network; then, it can calculate the real-time resistance value of the thermistor RT by measuring the charge and discharge time constant of the second RC network and combining it with the calibrated actual capacitance value of the impedance measurement capacitor C4.

[0052] Furthermore, one end of the standard reference resistor R3 is connected to the first pin PA4 of the main control unit 11, and the other end is connected to the first end of the impedance measurement capacitor C4; one end of the thermistor RT is connected to the second pin PA3 of the main control unit 11, and the other end is connected to the first end of the impedance measurement capacitor C4; the second end of the impedance measurement capacitor C4 is grounded.

[0053] The main control unit 11 obtains data from the temperature sensing unit 12 through the first pin PA4 and the second pin PA3, and can calculate the temperature value based on the data.

[0054] In this embodiment, the temperature sensing unit 12 significantly improves the accuracy of temperature measurement by comparing the measurements of the first and second RC networks and combining this with the detection of the RC time constant. This application eliminates power supply drift errors through dual-channel sampling, with alternating measurements at pin 2 PA4 and pin 1 PA3. Furthermore, this application enhances anti-interference capabilities by converting the resistance change of the thermistor RT into a time difference signal.

[0055] The LED display unit 13 includes two common-cathode LED displays. The cathodes of the two LED displays are connected to the units digit selection pins COM1 and COM2 of the main control unit 11, respectively. The anode of the LED unit of each LED display is connected to one of the seven or eight segment selection pins of the main control unit 11, thus multiplexing the segment selection pins. The first LED display is used to display the tens digit of the temperature, and the second LED display is used to display the digits of the temperature. In this embodiment, the LED display is a seven-segment display, and the anodes of its LEDs are connected to the segment selection pins A, B, C, D, E, F, and G of the main control unit 11, respectively.

[0056] Furthermore, the LED display unit 13 also includes light-emitting diodes 3A, 3B, 3C, 3D, 3E, 3F, and 3G, whose negative terminals are connected to the bit selection pin COM3 of the main control unit 11, and whose positive terminals are connected to the segment selection pins A, B, C, D, E, F, and G of the main control unit 11, and thus share segment selection pins with the digital tube. Specifically, light-emitting diode 3A is used to display the negative temperature symbol "-", and it is positioned in front of the digital tube displaying the temperature value. Light-emitting diode 3B is used to indicate the Celsius temperature symbol, and it is positioned at the upper rear corner of the digital tube displaying the temperature value. Light-emitting diode 3C is used to indicate the Fahrenheit temperature symbol, and it is positioned behind the digital tube displaying the temperature value and below light-emitting diode 3B. Light-emitting diodes 3D and 3E are used to display the hundreds digit of the temperature data, and they are positioned in front of the digital tube and behind light-emitting diode 3A. LEDs 3F and 3G are flashing indicator lights used to indicate the operating status. They are located behind the digital tube displaying the temperature value and below LED 3C.

[0057] During operation, the main control unit 11 can cycle through and activate the bit selection pins COM1, COM2, and COM3 at a set frequency. During each activation cycle of a bit selection pin, the main control unit 11 outputs the corresponding segment code data through the segment selection pin, achieving a stable display effect through the persistence of vision.

[0058] For example, when the external temperature is detected to be <0℃, a segment code is output during the activation cycle of the bit select pin COM3 to light up the LED 3A.

[0059] In this embodiment, the LED display unit 13 shares the AG segment line and achieves multi-digit display by time-division multiplexing COM1, COM2, and COM3, which can reduce IO usage: the display of data only requires 3 bit selection signals COM1, COM2, and COM3 and 7 segment selection signals AG. By utilizing the persistence of vision effect of the human eye, each LED is lit up in time-division, which can greatly reduce power consumption.

[0060] The main control unit 11 is connected to the USB power supply unit 14, the LED display unit 13 and the temperature sensing unit 12 respectively. It can receive data from the temperature sensing unit 12 and control the LED display unit 13 to display the temperature in real time.

[0061] In this embodiment, the main control unit 11U is provided with bit selection pins COM1, COM2, and COM3, segment selection pins A, B, C, D...G, and temperature sensing pins PA4 and PA3. Bit selection pin COM1 is connected to the negative terminals of LEDs 1A...1G, bit selection pin COM2 is connected to the negative terminals of LEDs 2A...2G, bit selection pin COM3 is connected to the negative terminals of LEDs 3A...3G, segment selection pin A is connected to the positive terminals of LEDs 1A, 2A, and 3A, and segment selection pin B is connected to the positive terminals of LEDs 1B, 2B, and 3B. The connection methods of segment selection pins C, D, E, F, and G are similar.

[0062] Thus, the USB thermometer device of this utility model is constituted. It adopts USB power supply, which simplifies the power supply design and can also simplify the appearance design, making power supply more convenient and easier to use, and achieving the purpose of being ready to use as needed.

[0063] In addition, the temperature sensing unit 12 can also be designed as a probe, which is electrically connected to the main control unit 11 via a cable, thus enabling the function of measuring the temperature of a specific target object.

[0064] Although the present invention has been disclosed through the above embodiments, the scope of the present invention is not limited thereto. Without departing from the concept of the present invention, the above components can be replaced by similar or equivalent elements known to those skilled in the art.

Claims

1. A USB thermometer device, characterized in that, It includes: The thermometer body (10) can detect temperature and display the detected temperature in real time; A USB interface (20) is fixedly mounted on the thermometer body (10) and electrically connected to the thermometer body (10); The USB interface (20) can be inserted into the USB interface (20) socket to draw power to the thermometer body (10) so as to display the detected temperature in real time.

2. The USB thermometer device as described in claim 1, characterized in that, The USB interface (20) is one of TYPE A, TYPE B, or TYPE C interfaces.

3. The USB thermometer device as described in claim 1, characterized in that, The thermometer body (10) contains: Main control unit (11), Temperature sensing unit (12) is electrically connected to the main control unit (11) and is used to detect temperature in real time; The LED display unit (13) is electrically connected to the main control unit (11) and is used to display the detected temperature in real time under the control of the main control unit (11). The USB interface (20) is electrically connected to the main control unit (11) via the USB power supply unit (14) to supply power to at least the main control unit (11).

4. The USB thermometer device as described in claim 3, characterized in that, The USB power supply unit (14) includes a step-down diode D1 and filter capacitors C5 and C6; The positive terminal of the step-down diode D1 is connected to the power pin VBUS of the USB interface (20), and the negative terminal is connected to the voltage pin VDD of the main control unit (11). One end of the filter capacitors C5 and C6 is grounded, and the other end is connected to the negative terminal of the step-down diode D1. The input voltage obtained from the USB interface (20) socket is stepped down by the step-down diode D1 and then supplied to the main control unit (11) for power supply.

5. The USB thermometer device as described in claim 4, characterized in that, The filter capacitor C5 has a capacitance of 4.7uF and is used for low-frequency filtering. The filter capacitor C6 has a capacitance of 0.1uF and is used for high-frequency decoupling.

6. The USB thermometer device as described in claim 3, characterized in that, The temperature sensing unit (12) includes a standard reference resistor R3, a thermistor RT, and an impedance measurement capacitor C4. The standard reference resistor R3 and the impedance measurement capacitor C4 form the first RC network; The thermistor RT and the impedance measurement capacitor C4 form a second RC network; The main control unit (11) can reverse calibrate the actual capacitance value of the impedance measurement capacitor C4 by measuring the charging and discharging time constant of the first RC network; The main control unit (11) can calculate the real-time resistance of the thermistor RT by measuring the charging and discharging time constant of the second RC network and combining it with the actual capacitance value of the calibrated impedance measurement capacitor C4.

7. The USB thermometer device as described in claim 6, characterized in that, One end of the standard reference resistor R3 is connected to the first pin PA4 of the main control unit (11), and the other end is connected to the first end of the impedance measurement capacitor C4; One end of the thermistor RT is connected to the second pin PA3 of the main control unit (11), and the other end is connected to the first end of the impedance measurement capacitor C4; The second terminal of the impedance measuring capacitor C4 is grounded; The main control unit (11) obtains data from the temperature sensing unit (12) through the first pin PA4 and the second pin PA3, and can calculate the temperature value based on the data.

8. The USB thermometer device as described in claim 7, characterized in that, The LED display unit (13) includes a 2-digit common cathode LED display. The cathodes of the 2-digit LED display are respectively connected to the two bit selection pins COM1 and COM2 of the main control unit (11). The positive terminal of the light-emitting diode unit of each digital tube is connected to 7 or 8 segment selection pins of the main control unit (11) to reuse the segment selection pins; The first digit of the LED display shows the tens digit of the temperature, and the second digit shows the digits of the temperature.

9. The USB thermometer device as described in claim 8, characterized in that, The LED display unit (13) also includes light-emitting diodes 3A, 3B, 3C, 3D, 3E, 3F, and 3G, whose negative terminals are respectively connected to the bit selection pin COM3 of the main control unit (11), and whose positive terminals are respectively connected to the seven segment selection pins of the main control unit (11) and multiplexed with the segment selection pins of the digital tube. Among them, LED 3A is used to display the symbol for negative temperature; The LED 3B is used as a symbol to indicate temperature in degrees Celsius. The symbol for LED 3C used to indicate Fahrenheit temperature; LEDs 3D and 3E are used to display the hundreds digit of the temperature data. LEDs 3F and 3G are flashing indicator lights used to indicate the operating status.

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