NB-IOT wireless vibration sensor circuit with ultra-low power consumption

Abstract

The utility model relates to the technical field of sensor circuit structures, and particularly discloses an ultra-low power consumption NB-IOT wireless vibration sensor circuit, which comprises a sensor circuit, a power supply circuit, a main controller circuit, an NB-IOT wireless communication circuit and a level conversion circuit, and is characterized in that the NB-IOT wireless communication circuit comprises an NB-IOT wireless communication module; the sensor circuit is connected with the main controller circuit, the main controller circuit is connected with the NB-IOT wireless communication circuit through the level conversion circuit, and the power supply circuit comprises multiple paths of power supply outputs with different voltages which are respectively connected with the main controller circuit, the level conversion circuit, the sensor circuit and the NB-IOT wireless communication circuit to provide electric energy. The circuit structure supports the NB-IOT function, data are transmitted in a wireless mode, and compared with an existing vibration sensor circuit, power consumption can be greatly reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to sensor circuit structure technical field. BACKGROUND

[0002] The existing vibration sensor device is generally high in power consumption, so that the device can only be powered by an external power supply, which is not flexible when the device needs to be moved, and the device cannot operate normally when power failure or other special conditions occur.

[0003] The existing vibration sensor device generally transmits data in a wired mode, which increases the construction cost of the entire system, and the wired line is difficult to maintain, so that data cannot be transmitted once the line has a problem. In addition, the vibration sensor device generally works in an environment prone to vibration, so that the wired connection is prone to loosening during vibration, thereby causing the device to fail to work.

[0004] The existing vibration sensor using a wireless mode generally does not support NB-IOT function and cannot be compatible with cellular network, so that a wireless network needs to be redeployed, resulting in high deployment cost. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of NB-IOT wireless vibration sensor circuit of ultra-low power consumption, and the circuit structure supports NB-IOT function, and data is transmitted in a wireless mode, which can greatly reduce power consumption compared with the existing vibration sensor circuit.

[0006] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows: a kind of NB-IOT wireless vibration sensor circuit of ultra-low power consumption, including sensor circuit, power supply circuit, main controller circuit, NB-IOT wireless communication circuit and level conversion circuit, the NB-IOT wireless communication circuit includes NB-IOT wireless communication module, the sensor circuit and main controller circuit are connected, the main controller circuit is connected with NB-IOT wireless communication circuit by level conversion circuit, the power supply circuit includes the power supply output of multiple different voltages respectively connected main controller circuit, level conversion circuit, sensor circuit and NB-IOT wireless communication circuit to provide electric energy.

[0007] The power supply circuit includes a battery, the positive electrode of the battery is connected to power supply +BAT, the negative electrode of the battery is connected to ground through a fuse, and the battery outputs another power supply through a connection voltage reduction chip.

[0008] The sensor circuit includes a three-axis MEMS accelerometer chip.

[0009] The main controller circuit includes a single-chip microcomputer.

[0010] The level conversion circuit includes a level conversion chip U5.

[0011] The NB-IOT wireless communication circuit includes an NB-IOT wireless communication module chip.

[0012] The VIN pin of the step-down chip is connected to a power supply +BAT, the GND pin is connected to the ground, and another power supply is output through the VOUT pin.

[0013] The CS pin and VDD pin of the three-axis MEMS accelerometer chip are connected to the power supply output by the VOUT pin of the step-down chip, the GND pin and RES pin are connected to the ground, the SCL pin is connected to the PB10 pin of the single-chip microcomputer and connected to the power supply output by the VOUT pin of the step-down chip through the resistor R1, and the SDA pin of the three-axis MEMS accelerometer chip is connected to the PB11 pin of the single-chip microcomputer and connected to the power supply output by the VOUT pin of the step-down chip through the resistor R2.

[0014] The NB-IOT wireless communication module U4 is inserted into the SIM card slot SIM1 with a SIM card, connected to a cellular network, the VDD pin and VBAT pin are connected to the power supply +BAT, the GND pin is connected to the ground, the USIM_GND pin is connected to the GND pin of the SIM card slot SIM1, the USIM_DATA pin is connected to the I / O pin of the SIM card slot SIM1, the USIM_RST pin is connected to the RST pin of the SIM card slot SIM1, the USIM_CLK pin is connected to the CLK pin of the SIM card slot SIM1, the USIM_VDD pin is connected to the VCC pin of the SIM card slot SIM1, the RESET pin is connected to the power supply +BAT through a resistor, and the RF_ANT pin is connected to the SIG pin of the antenna connection seat.

[0015] The VCCA pin, OE pin of the level conversion chip are connected to the power supply output by the VOUT pin of the step-down chip, the VCCB pin is connected to the power supply +BAT, the GND pin is connected to the ground, the B2 pin is connected to the RXD pin of the NB-IOT wireless communication module, the B1 pin is connected to the TXD pin of the NB-IOT wireless communication module, the A2 pin is connected to the PA2 pin of the single-chip microcomputer, and the A1 pin is connected to the PA3 pin of the single-chip microcomputer.

[0016] The VLCD, VDDA, VDD1, VDD_2, and VDD_3 pins of the microcontroller are connected to the power output of the VOUT pin of the buck converter chip. The VSSA, VSS_1, VSS_2, and VSS_3 pins are connected to ground. The NRST pin is connected to the power output of the VOUT pin of the buck converter chip through a resistor. The BOOT0 pin is connected to ground through a resistor. The PH0-OSC_IN and PH0-OSC_OUT pins are connected to the crystal oscillator and then connected to ground through a capacitor.

[0017] The microcontroller is connected to the three-axis MEMS accelerometer via an I2C bus, and the microcontroller is connected to the level conversion chip via a UART bus.

[0018] The step-down chip is model XC6206P182MR; the fuse is model JK-SMD0603-100L; the triaxial MEMS accelerometer chip is model LIS2DS12; the NB-IOT wireless communication module U4 is model BC28CNVBA-I01-CNASA; the SIM card slot is model MICRO-SIM-6P-H1.35; the antenna connector is model U.FL-R-SMT-1(80); the microcontroller is model STM32L151; and the level conversion chip is model TXS0102DCUR.

[0019] By adopting the above technical solutions, the beneficial effects of this utility model are as follows: (1) Convenient transmission: This circuit structure supports NB-IoT function for wireless data transmission. Vibration data is transmitted to external terminals through the NB-IoT wireless communication circuit. It has the advantages of low cost, stable performance, good scalability and easy maintenance. Data transmission can be easily achieved without laying complex wired connections. (2) Low power consumption: The circuit structure uses an ultra-low power triaxial MEMS accelerometer, a microcontroller and an NB-IoT wireless communication module. In the test, the maximum instantaneous power consumption of the entire circuit did not exceed 0.36 watts and the average power consumption did not exceed 0.12 watts. Compared with the existing technology, it can significantly reduce power consumption. A 3300mAh battery can be used for more than 5 years. (3) Portability: This circuit structure uses battery power supply. The battery can be replaced at any time, which provides convenience for the movement of the device. The circuit structure does not need to use an external power supply and can ensure the normal operation of the device during power outages. (4) Stability: The software program of this circuit structure is highly efficient and does not have complex judgment logic. It only needs to read the data of the three-axis MEMS accelerometer and send the read data out through the NB-IOT wireless communication circuit to ensure the stability of the entire device operation. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the sensor circuit in an ultra-low power NB-IoT wireless vibration sensor circuit.

[0021] Figure 2 This is a schematic diagram of the power supply circuit in an ultra-low power NB-IoT wireless vibration sensor circuit.

[0022] Figure 3 This is a schematic diagram of the main controller circuit in an ultra-low power NB-IoT wireless vibration sensor circuit.

[0023] Figure 4 This is a schematic diagram of the NB-IoT wireless communication circuit in an ultra-low power NB-IoT wireless vibration sensor circuit.

[0024] Figure 5 This is a schematic diagram of the level conversion circuit in an ultra-low power NB-IoT wireless vibration sensor circuit.

[0025] In the picture:

[0026] Sensor circuit 1, power supply circuit 2, main controller circuit 3, NB-IoT wireless communication circuit 4, level conversion circuit 5. Detailed Implementation

[0027] To further explain the technical solution of this utility model, the following detailed description is provided through specific embodiments.

[0028] An ultra-low power NB-IoT wireless vibration sensor circuit includes a sensor circuit 1, a power supply circuit 2, a main controller circuit 3, an NB-IoT wireless communication circuit 4, and a level conversion circuit 5. The power supply circuit 2 includes a battery BT1 and a step-down chip U2. The main controller circuit 3 includes a microcontroller U3. The sensor circuit 1 includes a triaxial MEMS accelerometer chip U1. The level conversion circuit 5 includes a level conversion chip U5. The NB-IoT wireless communication circuit 4 includes an NB-IoT wireless communication module U4. The sensor circuit 1 and the main controller circuit 3 are connected. The main controller circuit 3 is connected to the NB-IoT wireless communication circuit 4 through the level conversion circuit 5. The power supply circuit 2 provides power to the main controller circuit 3, the level conversion circuit 5, the sensor circuit 1, and the NB-IoT wireless communication circuit 4. The following describes the circuit in conjunction with... Figures 1-5 The circuit structure of each circuit is described in detail.

[0029] The power supply circuit 2 is used to provide electrical energy to the entire sensor circuit of this utility model. The power supply circuit 2 is as follows: Figure 2 As shown, the circuit includes a battery BT1 (in this embodiment, a 3300mAh battery BT1 is used) and a step-down chip U2 (in this embodiment, an existing product with model number XC6206P182MR is used). The positive terminal of the battery BT1 is connected to the power supply +BAT, and the negative terminal of the battery BT1 is connected to ground GND through a fuse F1 (in this embodiment, an existing product with model number JK-SMD0603-100L is used). The fuse F1 provides safety protection for the entire sensor circuit. The third pin, VIN, of the step-down chip U2 is connected to the power supply +BAT. The step-down chip U2 outputs another power supply through its second pin, VOUT. As shown in the figure, the VOUT pin outputs a +1.8V power supply. This circuit converts the voltage through the step-down chip U2 and can provide power to chips in the sensor circuit that require lower voltage levels. Each circuit is connected to the corresponding power supply according to the required power supply voltage.

[0030] The sensor circuit 1, as follows Figure 1 As shown, it includes a three-axis MEMS accelerometer chip U1 (in this embodiment, an existing product of model LIS2DS12 is used). Its pin 2 (CS pin), pins 9 and 10 (VDD pins) are connected to the 1.8V power supply output from the VOUT pin of the buck converter chip U2. Its pins 6 and 8 (GND pins) and pin 7 (RES pin) are connected to ground GND. Its pin 1 (SCL pin) is connected to... Figure 1 Pin 21 (PB10 pin) of the microcontroller U3 in the main controller circuit 3 is connected to the 1.8V power supply output from the VOUT pin of the step-down chip U2 via resistor R1 (a 10K resistor is used in this embodiment). Pin 4 (SDA pin) of the triaxial MEMS accelerometer chip U1 is connected to pin 22 (PB11 pin) of the microcontroller U3 via resistor R2 (a 10K resistor is used in this embodiment) to the 1.8V power supply output from the VOUT pin of the step-down chip U2. The triaxial MEMS accelerometer U1 has extremely low power consumption, with a maximum operating current of only 150uA. It can acquire acceleration data of the device on the x, y, and z axes in real time and transmit high-precision triaxial acceleration information to the main controller U3 in real time via the I2C bus connected to the PB10 and PB11 pins of the microcontroller U3. The triaxial MEMS accelerometer U1 also has a self-test function to ensure stable operation of the accelerometer.

[0031] NB-IoT wireless communication circuit 4 enables data transmission with external terminals via wireless connection, specifically as follows: Figure 4As shown, it includes an NB-IoT wireless communication module U4 (an existing product with model number BC28CNVBA-I01-CNASA is used in the implementation of this embodiment). When using the wireless communication function, a SIM card needs to be inserted into the SIM card slot SIM1 (an existing product with model number MICRO-SIM-6P-H1.35 is used in the implementation of this embodiment). After inserting the SIM card, it can directly connect to the cellular network, thereby realizing the wireless communication function of accessing the cellular network and interacting with other NB-IoT wireless devices. No additional wireless network deployment is required, which reduces the deployment cost of the wireless network. The NB-IoT wireless communication circuit has extremely low power consumption, with an operating current of only 2uA in power-saving mode. Pin 24 (VDD pin) and pins 42 and 43 (VBAT pins) of the NB-IoT wireless communication module U4 are connected to the power supply +BAT. Pins 1, 27, 34, 36, 37, 40, and 41 (GND pins) are connected to ground (GND). Pin 10 (USIM_GND pin) is connected to the GND pins of pins 8, 9, 10, and 11 of the SIM card slot SIM1. Pin 11 (USIM_DATA pin) is connected to pin 7 (I / O pin) of the SIM card slot SIM1. Pin 12 (USIM_RST pin) is connected to pin 2 (R... The ST pin is connected to the 13th pin (USIM_CLK pin), the 3rd pin (CLK pin) of the SIM card slot SIM1 is connected to the 14th pin (USIM_VDD pin), the 1st pin (VCC pin) of the SIM card slot SIM1 is connected to the 15th pin (RESET pin), the 15th pin (RESET pin) is connected to the power supply +BAT through the resistor R5 (a 10K resistor is used in the embodiment), and the 35th pin (RF_ANT pin) is connected to the 1st pin (SIG pin) of the antenna connector J1 (an existing product with model number U.FL-R-SMT-1(80) is used in the embodiment).

[0032] The level conversion circuit 5, such as Figure 5As shown, the system includes a level conversion chip U5 (in this embodiment, an existing product with model number TXS0102DCUR is used). Its pins 3 (VCCA pin) and 6 (OE pin) are connected to the 1.8V power supply output from the VOUT pin of the step-down chip U2. Its pin 7 (VCCB pin) is connected to the power supply +BAT. Its pin 2 (GND pin) is connected to ground GND. Its pin 1 (B2 pin) is connected to pin 17 (RXD pin) of the NB-IOT wireless communication module U4. Its pin 8 (B1 pin) is connected to pin 18 (TXD pin) of the NB-IOT wireless communication module U4. Its pin 4 (A2 pin) is connected to pin 12 (PA2 pin) of the microcontroller U3. Its pin 5 (A1 pin) is connected to pin 13 (PA3 pin) of the microcontroller U3.

[0033] The main controller circuit 3, such as Figure 3As shown, the system includes a microcontroller U3 (an existing product, model STM32L151, is used in this embodiment). The microcontroller U3 has extremely low power consumption, with a working current of only 8.6uA when operating in low-power mode. The microcontroller U3 is connected to the triaxial MEMS accelerometer U1 via an I2C bus. It can obtain the acceleration data of the triaxial MEMS accelerometer U1 through the I2C bus and calculate the vibration data. The microcontroller U3 is connected to the NB-IoT wireless communication module U4 via a UART bus. It can transmit the calculated vibration data to the NB-IoT wireless communication circuit 4 in real time through the UART bus, and the NB-IoT wireless communication circuit 4 transmits the vibration data to the external terminal in real time. In the main controller circuit, pins 1 (VLCD), 9 (VDDA), 24 (VDD1), 36 (VDD2), and 48 (VDD3) of the microcontroller U3 are connected to the 1.8V power supply output from the VOUT pin of the step-down chip U2. Pins 8 (VSSA), 23 (VSS1), 35 (VSS2), and 47 (VSS3) are connected to ground (GND). Pin 7 (NRST) is connected to the ground through resistor R4 (used in the embodiment). A 10K resistor is connected to the 1.8V power supply output from the VOUT pin of the step-down chip U2. Pin 44 (BOOT0 pin) is connected to ground GND through resistor R3 (a 10K resistor is used in the embodiment). Pins 5 (PH0-OSC_IN pin) and 6 (PH0-OSC_OUT pin) are connected to crystal oscillator X1 (an existing product of model X50328MSB2GI is used in the embodiment), and connected to ground GND through capacitors C1 and C2 (a 33pF capacitor is used in the embodiment). In the aforementioned main controller circuit 3, the microcontroller U3 collects the triaxial acceleration information from the triaxial MEMS accelerometer U1 and calculates it to obtain vibration data such as vibration velocity and vibration distance on the three axes. The vibration data is then sent to the NB-IoT wireless communication module U4. Since the voltage levels of the microcontroller U3 and the NB-IoT wireless communication module U4 are different, the microcontroller U3 needs to use the level conversion chip U5 to convert the signals of different voltage levels when transmitting data with the NB-IoT wireless communication module U4 via the UART bus. The microcontroller U3 transmits the vibration data to the NB-IoT wireless communication module U4 in real time through the UART bus and the antenna connector J1 connected to the NB-IoT wireless communication module U4 to transmit the real-time vibration data wirelessly.

[0034] With the above sensor circuit structure, the power consumption of the entire sensor circuit can be significantly reduced compared to the existing vibration sensor circuit when the embodiment is implemented. The maximum instantaneous power consumption during the circuit structure test does not exceed 0.36 watts and the average power consumption does not exceed 0.12 watts.

[0035] The above embodiments and figures are not intended to limit the product form and style of this utility model. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of this utility model.

Claims

1. A low-power NB-IoT wireless vibration sensor circuit, characterized in that, It includes a sensor circuit, a power supply circuit, a main controller circuit, an NB-IoT wireless communication circuit, and a level conversion circuit. The NB-IoT wireless communication circuit includes an NB-IoT wireless communication module. The sensor circuit and the main controller circuit are connected. The main controller circuit is connected to the NB-IoT wireless communication circuit through the level conversion circuit. The power supply circuit includes multiple power outputs of different voltages, which are respectively connected to the main controller circuit, the level conversion circuit, the sensor circuit, and the NB-IoT wireless communication circuit to provide power.

2. The ultra-low power NB-IoT wireless vibration sensor circuit as described in claim 1, characterized in that, The power supply circuit includes a battery, with the positive terminal of the battery connected to the power supply +BAT and the negative terminal connected to ground via a fuse. The battery outputs another power source by stepping down the voltage through a step-down chip. Alternatively, the sensor circuit includes a three-axis MEMS accelerometer chip. Alternatively, the main controller circuit includes a microcontroller. Alternatively, the level conversion circuit includes a level conversion chip. Alternatively, the NB-IoT wireless communication circuit includes an NB-IoT wireless communication module chip.

3. The ultra-low power NB-IoT wireless vibration sensor circuit as described in claim 2, characterized in that, The VIN pin of the step-down chip is connected to the power supply +BAT, its GND pin is connected to ground, and another power supply is output through the VOUT pin. The CS and VDD pins of the triaxial MEMS accelerometer chip are connected to the power output of the VOUT pin of the step-down chip, the GND and RES pins are connected to ground, the SCL pin is connected to the PB10 pin of the microcontroller, and is connected to the power output of the VOUT pin of the step-down chip through resistor R1. The SDA pin of the triaxial MEMS accelerometer chip is connected to the PB11 pin of the microcontroller, and is connected to the power output of the VOUT pin of the step-down chip through resistor R2. The NB-IoT wireless communication module U4 inserts a SIM card into the SIM card slot and connects to the cellular network. Its VDD and VBAT pins are connected to the power supply +BAT, its GND pin is connected to ground, its USIM_GND pin is connected to the GND pin of the SIM card slot SIM1, its USIM_DATA pin is connected to the I / O pin of the SIM card slot SIM1, its USIM_RST pin is connected to the RST pin of the SIM card slot SIM1, its USIM_CLK pin is connected to the CLK pin of the SIM card slot, its USIM_VDD pin is connected to the VCC pin of the SIM card slot, its RESET pin is connected to the power supply +BAT through a resistor, and its RF_ANT pin is connected to the SIG pin of the antenna connector. The level conversion chip has its VCCA and OE pins connected to the power output of the VOUT pin of the step-down chip, its VCCB pin connected to the power supply +BAT, its GND pin connected to ground, its B2 pin connected to the RXD pin of the NB-IOT wireless communication module, its B1 pin connected to the TXD pin of the NB-IOT wireless communication module, its A2 pin connected to the PA2 pin of the microcontroller, and its A1 pin connected to the PA3 pin of the microcontroller. The VLCD, VDDA, VDD1, VDD_2, and VDD_3 pins of the microcontroller are connected to the power output of the VOUT pin of the buck converter chip. The VSSA, VSS_1, VSS_2, and VSS_3 pins are connected to ground. The NRST pin is connected to the power output of the VOUT pin of the buck converter chip through a resistor. The BOOT0 pin is connected to ground through a resistor. The PH0-OSC_IN and PH0-OSC_OUT pins are connected to the crystal oscillator and then connected to ground through a capacitor.

4. The ultra-low power NB-IoT wireless vibration sensor circuit as described in claim 3, characterized in that, The microcontroller is connected to the three-axis MEMS accelerometer via an I2C bus, and the microcontroller is connected to the level conversion chip via a UART bus.

5. The ultra-low power NB-IoT wireless vibration sensor circuit as described in claim 3, characterized in that, The step-down chip is of model XC6206P182MR; and / or, the fuse is of model JK-SMD0603-100L; and / or, the triaxial MEMS accelerometer chip is of model LIS2DS12; and / or, the NB-IOT wireless communication module U4 is of model BC28CNVBA-I01-CNASA; and / or, the SIM card slot is of model MICRO-SIM-6P-H1.35; and / or, the antenna connector is of model U.FL-R-SMT-1(80); and / or, the microcontroller is of model STM32L151; and / or, the level conversion chip is of model TXS0102DCUR.

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