Ultrasonic Internet of Things water meter signal tester

Abstract

The utility model discloses an ultrasonic wave Internet of Things water meter signal tester. The ultrasonic wave Internet of Things water meter signal tester comprises a main control module, a charging module, an NB-IOT module, a card selection module, a Bluetooth module, a key module and a communication power supply control circuit, the input end of the main control module is electrically connected with the output end of the charging module, the output end of the main control module is electrically connected with the input ends of the NB-IOT module, the card selection module, the Bluetooth module and the key module, and the output end of the NB-IOT module is electrically connected with the input end of the card selection circuit. The output end of the card selection circuit is connected with multiple types of Internet of Things cards; the communication power supply control circuit is electrically connected with the main control module and the NB-IOT module. The ultrasonic water meter tester solves the technical problems that an existing ultrasonic water meter tester of the internet of things is poor in electric power storage capacity and can not carry out selection and data comparison on multiple types of cards of the internet of things at the same time.

Description

Technical Field

[0001] This utility model relates to the field of IoT water meter technology, and in particular to an ultrasonic IoT water meter signal tester. Background Technology

[0002] With the widespread application of NB-IoT devices across various industries, the success rate of network reporting varies significantly among different devices. Before installation, manufacturers, for example with ultrasonic IoT water meters, need to test the installation environment using an NB signal tester. Currently, NB signal testers on the market have high standby power consumption and short battery life. If carried outdoors, they require two or more recharges, increasing user costs. For example, a patent document with application number 202122287763.7 discloses a testing fixture system for an ultrasonic water meter motherboard. When testing the NB signal in the environment to select the type of IoT card used by the device, i.e., conducting selective testing for telecom, mobile, and interoperable networks, a single-step card replacement and installation test is required. The IoT cards are inserted into the card slots one by one, and each is reported. The data from the three types is then compared to determine network quality, making the process time-consuming and labor-intensive. In enclosed installation environments, using a handheld tester requires opening the cover, which results in large signal errors and unreliable data. Therefore, there is an urgent need to develop an ultrasonic IoT water meter signal tester to solve the technical problems of poor power storage capacity and inability to simultaneously select and compare data from multiple types of IoT cards in existing ultrasonic IoT water meter testers. Utility Model Content

[0003] The main purpose of this invention is to propose an ultrasonic IoT water meter signal tester, which aims to solve the technical problems of poor power storage capacity and inability to simultaneously select and compare data from multiple types of IoT cards in existing ultrasonic IoT water meter testers.

[0004] To achieve the above objectives, this utility model provides an ultrasonic IoT water meter signal tester, wherein the ultrasonic IoT water meter signal tester includes:

[0005] The system comprises a main control module, a charging module, an NB-IoT module, a card selection module, a Bluetooth module, a button module, and a communication power control circuit. The input terminal of the main control module is electrically connected to the output terminal of the charging module. The output terminal of the main control module is electrically connected to the input terminals of the NB-IoT module, the card selection module, the Bluetooth module, and the button module, respectively. The output terminal of the NB-IoT module is electrically connected to the input terminal of the card selection circuit, and the output terminal of the card selection circuit is connected to multiple types of IoT cards. The communication power control circuit is electrically connected to both the main control module and the NB-IoT module.

[0006] In one preferred embodiment, the charging module includes a charging circuit, a power conversion circuit, and a battery voltage detection circuit; one end of the charging circuit is connected to an external power source via an interface, and the other end of the charging circuit is electrically connected to both the power conversion circuit and the battery voltage detection circuit, both of which are electrically connected to the main control module.

[0007] In one preferred embodiment, the charging circuit includes an interface U2; pins 2 and 11 of the interface U2 are connected to a TVS diode TV1, a power supply terminal, a capacitor C9, pin 4 of a battery charging management chip U3, and a resistor R9, respectively; the other end of the resistor R9 is connected to the anode of a light-emitting diode LED1, and the cathode of the light-emitting diode LED1 is connected to pin 1 of the battery charging management chip U3; pin 5 of the battery charging management chip U3 is connected to a resistor R8, and the other end of the resistor R8, capacitor C9, and TVS diode TV1 is grounded; pin 2 of the battery charging management chip U3 is connected to the lithium battery and ground, respectively; pin 3 of the battery charging management chip U3 is connected to a power conversion circuit, a battery voltage detection circuit, and the lithium battery, respectively; pins 1, 12, 13, 14, 16, and 18 of the interface U2 are grounded.

[0008] In one preferred embodiment, the power conversion circuit includes a voltage regulator U4; pin 1 of the voltage regulator U4 is connected to resistor R10, the cathode of diode D1, the cathode of diode D2, and capacitor C10 respectively; the other end of resistor R10 is connected to pin 3 of the voltage regulator U4; the anode of diode D1 is connected to the lithium battery; and the anode of diode D2 is connected to the charging circuit; pin 5 of the voltage regulator U4 is connected to resistor R11 and capacitor C12 respectively; the other end of resistor R11 is connected to the main control module and capacitor C14 respectively; pin 4 of the voltage regulator U4 is connected to capacitor C11; and the other ends of capacitors C11, C12, C14, and C10 are grounded.

[0009] In one preferred embodiment, the battery voltage detection circuit includes transistors V1 and V2, resistors R12, R13, R14, R15, and capacitor C15. The emitter of transistor V1 is connected to the lithium battery, the base of transistor V1 is connected to resistor R13, the other end of resistor R13 is connected to the collector of transistor V2, and the base of transistor V2 is connected to the main control module through resistor R12. The collector of transistor V1 is connected to resistor R14, the other end of resistor R14 is connected to the main control module, resistor R15, and capacitor C15, respectively, and the emitter of transistor V2, the other end of resistor R15, and capacitor C15 are grounded.

[0010] In one preferred embodiment, the card selection module includes a first card selection circuit, a second card selection circuit, and a third card selection circuit; the first card selection circuit, the second card selection circuit, and the third card selection circuit are electrically connected to various types of IoT cards, a main control module, and an NB-IoT module, respectively.

[0011] In one preferred embodiment, the first card selection circuit, the second card selection circuit, and the third card selection circuit have the same circuit structure; the first card selection circuit includes a switching transistor Q4; the gate of the switching transistor Q4 is connected to resistors R33 and R34 respectively, and the other end of resistor R34 is connected to the main control module; the source of the switching transistor Q4 is connected to the NB-IoT module and the other end of resistor R33 respectively; the drain of the switching transistor Q4 is connected to the first IoT card.

[0012] In one preferred embodiment, the Bluetooth module includes a Bluetooth chip U6;

[0013] Pins 8 and 9 of the Bluetooth chip U6 are connected to resistors R27 and R28 respectively, and the other ends of resistors R27 and R28 are connected to the main control module.

[0014] Pin 14 of the Bluetooth chip U6 is connected to capacitor C18 and the drain of switching transistor Q2. The gate of switching transistor Q2 is connected to resistors R25 and R26. The source of switching transistor Q2 is connected to the other end of resistor R26 and the power supply terminal. The other end of resistor R25 is connected to the main control module. Pin 15 of the Bluetooth chip and the other end of capacitor C18 are grounded.

[0015] In one preferred embodiment, the button module includes a button K1; pin 1 of the button K1 is connected to resistors R6 and R7 respectively, the other end of resistor R6 is connected to the power supply terminal, and the other end of resistor R7 is connected to capacitor C8 and the main control module respectively; pins 2, 3, and 4 of the button K1 and the other end of capacitor C8 are grounded.

[0016] In one preferred embodiment, the ultrasonic IoT water meter signal tester further includes an indicator light circuit; the input terminal of the indicator light circuit is connected to the output terminal of the main control module; the indicator light circuit includes LED2, LED3, resistor R16, and resistor R17; one end of LED2 is connected to LED3 and the power supply terminal respectively, the other end of LED2 is connected to resistor R16, the other end of resistor R16 is connected to the main control module, and the other end of LED3 is connected to the main control module through resistor R17.

[0017] In the above technical solution of this utility model, the ultrasonic IoT water meter signal tester includes: a main control module, a charging module, an NB-IoT module, a card selection module, a Bluetooth module, a button module, and a communication power control circuit; the input terminal of the main control module is electrically connected to the output terminal of the charging module, the output terminal of the main control module is electrically connected to the input terminals of the NB-IoT module, the card selection module, the Bluetooth module, and the button module, respectively, the output terminal of the NB-IoT module is electrically connected to the input terminal of the card selection circuit, and the output terminal of the card selection circuit is connected to multiple types of IoT cards; the communication power control circuit is electrically connected to the main control module and the NB-IoT module. This invention allows users to charge and use the device simultaneously via a charging module, improving the lifespan of lithium batteries. It also enables remote control commands to be sent to the Bluetooth module via a terminal, such as a mobile phone, simplifying operation. Furthermore, by setting a card selection module, it can simultaneously support the operation of three types of IoT cards (China Telecom, China Mobile, and China Unicom) and acquire comparative data for these three network types for user selection. This solves the technical problems of existing ultrasonic IoT water meter testers, such as poor battery capacity and the inability to simultaneously select and compare data from multiple types of IoT cards. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of an ultrasonic IoT water meter signal tester according to an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the main control module in an embodiment of the present utility model;

[0021] Figure 3 This is a schematic diagram of the charging circuit according to an embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the power conversion circuit according to an embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram of the battery voltage detection circuit according to an embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram of the button module according to an embodiment of the present utility model;

[0025] Figure 7This is a schematic diagram of the indicator light circuit in an embodiment of the present invention;

[0026] Figure 8 This is a schematic diagram of the download port circuit in an embodiment of this utility model;

[0027] Figure 9 This is a schematic diagram of an NB-IoT module according to an embodiment of the present invention;

[0028] Figure 10 This is a schematic diagram of the communication power control circuit according to an embodiment of the present invention;

[0029] Figure 11 This is a schematic diagram of the communication serial port conversion circuit according to an embodiment of the present invention;

[0030] Figure 12 This is a schematic diagram of the first card selection circuit according to an embodiment of the present utility model;

[0031] Figure 13 This is a schematic diagram of the second card selection circuit according to an embodiment of the present invention;

[0032] Figure 14 This is a schematic diagram of the third card selection circuit in an embodiment of the present invention;

[0033] Figure 15 This is a schematic diagram of the first Internet of Things embodiment of the present utility model;

[0034] Figure 16 This is a schematic diagram of the second Internet of Things according to an embodiment of the present invention;

[0035] Figure 17 This is a schematic diagram of the third Internet of Things embodiment of this utility model;

[0036] Figure 18 This is a schematic diagram of the Bluetooth module in an embodiment of the present invention.

[0037] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the implementation methods and with reference to the accompanying drawings. Detailed Implementation

[0038] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0040] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0041] See Figures 1-18 According to one aspect of this utility model, this utility model provides an ultrasonic IoT water meter signal tester, wherein the ultrasonic IoT water meter signal tester includes:

[0042] The system comprises a main control module, a charging module, an NB-IoT module, a card selection module, a Bluetooth module, a button module, and a communication power control circuit. The input terminal of the main control module is electrically connected to the output terminal of the charging module. The output terminal of the main control module is electrically connected to the input terminals of the NB-IoT module, the card selection module, the Bluetooth module, and the button module, respectively. The output terminal of the NB-IoT module is electrically connected to the input terminal of the card selection circuit, and the output terminal of the card selection circuit is connected to multiple types of IoT cards. The communication power control circuit is electrically connected to both the main control module and the NB-IoT module.

[0043] Specifically, in this embodiment, the charging module includes a charging circuit, a power conversion circuit, and a battery voltage detection circuit; one end of the charging circuit is connected to an external power source through an interface, and the other end of the charging circuit is electrically connected to the power conversion circuit and the battery voltage detection circuit, respectively. Both the power conversion circuit and the battery voltage detection circuit are electrically connected to the main control module.

[0044] Specifically, in this embodiment, the charging circuit includes an interface U2; pins 2 and 11 of the interface U2 are respectively connected to the TVS diode TV1, the power supply terminal, capacitor C9, pin 4 of the battery charging management chip U3, and resistor R9. The other end of resistor R9 is connected to the anode of the light-emitting diode LED1, and the cathode of the light-emitting diode LED1 is connected to pin 1 of the battery charging management chip U3; pin 5 of the battery charging management chip U3 is connected to resistor R8, and the other end of resistor R8, capacitor C9, and TVS diode TV1 is grounded; the battery charging management... Pin 2 of chip U3 is connected to the lithium battery and ground respectively; pin 3 of the battery charging management chip U3 is connected to the power conversion circuit, the battery voltage detection circuit and the lithium battery respectively; pins 1, 12, 13, 14, 16 and 18 of interface U2 are grounded; in this utility model, interface U2 adopts a Type-C interface, which is not specifically limited in this utility model and can be set as needed; the charging circuit can be connected to an external power supply through this Type-C interface to continuously charge the lithium battery, thereby providing power to the main control module and other functional modules.

[0045] Specifically, in this embodiment, the power conversion circuit includes a voltage regulator U4; pin 1 of the voltage regulator U4 is connected to resistor R10, the cathode of diode D1, the cathode of diode D2, and capacitor C10, respectively; the other end of resistor R10 is connected to pin 3 of the voltage regulator U4; the anode of diode D1 is connected to the lithium battery; the anode of diode D2 is connected to pin 2 of the charging circuit interface U2; pin 5 of the voltage regulator U4 is connected to resistor R11 and capacitor C12, respectively; the other end of resistor R11 is connected to the main control module and capacitor C14, respectively; pin 4 of the voltage regulator U4 is connected to capacitor C11, and the capacitor C11... The other ends of capacitors C12, C14, and C10 are grounded. The power conversion module is used to convert the energy stored in the lithium battery into the voltage required by the main control module. In this invention, the power conversion circuit is used to convert the 5V voltage into the 3.3V voltage required by the main control module. This invention is not specifically limited and can be set according to needs. In this invention, the lithium battery is a 505050 high-capacity 1600mA lithium battery. Diodes D1 and D2 are used to allow users to charge and use the device simultaneously when the battery is low, providing continuous power for users to use the instrument. The standby power consumption is designed to be in the μA range, and the standby life is more than 1 year.

[0046] Specifically, in this embodiment, the battery voltage detection circuit includes transistors V1 and V2, resistors R12, R13, R14, R15, and capacitor C15; the emitter of transistor V1 is connected to the lithium battery, the base of transistor V1 is connected to resistor R13, the other end of resistor R13 is connected to the collector of transistor V2, and the base of transistor V2 is connected to the main control module through resistor R12; the collector of transistor V1 is connected to resistor R14, and resistor R15... The other end of 4 is connected to the main control module, resistor R15, and capacitor C15 respectively. The emitter of transistor V2, the other end of resistor R15, and capacitor C15 are grounded. The battery voltage detection circuit is used to detect the voltage of the lithium battery, ensure that the lithium battery works within a safe range, and provide corresponding signals or circuit protection in abnormal conditions. For example, if the power line voltage is abnormal, a signal is output to the main control module to convey the abnormal state. The abnormal state can be judged or the instrument can be stopped, thereby protecting the equipment and extending the battery life.

[0047] Specifically, in this embodiment, the card selection module includes a first card selection circuit, a second card selection circuit, and a third card selection circuit; the first card selection circuit, the second card selection circuit, and the third card selection circuit are electrically connected to various types of IoT cards, a main control module, and an NB-IoT module, respectively; this utility model can realize one-click full network connectivity testing through the first card selection circuit, the second card selection circuit, and the third card selection circuit, thereby completing the test synchronously in a short time.

[0048] Specifically, in this embodiment, the first card selection circuit, the second card selection circuit, and the third card selection circuit have the same circuit structure;

[0049] The first card selection circuit includes a switching transistor Q4; the gate of the switching transistor Q4 is connected to resistors R33 and R34 respectively, and the other end of resistor R34 is connected to the main control module; the source of the switching transistor Q4 is connected to the NB-IoT module and the other end of resistor R33 respectively; the drain of the switching transistor Q4 is connected to the first IoT card.

[0050] The second card selection circuit includes a switching transistor Q5; the gate of the switching transistor Q5 is connected to resistors R35 and R36 respectively, and the other end of resistor R36 is connected to the main control module; the source of the switching transistor Q5 is connected to the NB-IoT module and the other end of resistor R35 respectively; the drain of the switching transistor Q5 is connected to the second IoT card.

[0051] The third card selection circuit includes a switching transistor Q6; the gate of the switching transistor Q6 is connected to resistors R37 and R38 respectively, and the other end of resistor R38 is connected to the main control module; the source of the switching transistor Q6 is connected to the NB-IoT module and the other end of resistor R37 respectively; the drain of the switching transistor Q6 is connected to the third IoT card.

[0052] The first, second, and third IoT cards are China Telecom, China Mobile, and China Unicom cards, respectively. The VDD power supply of the IoT cards is switched via the switching transistors Q4, Q5, and Q6 of the first, second, and third card selection circuits. The NB-IoT module uses a China Mobile MN326-X. A one-button start-up reporting test is initiated by turning on the communication power control circuit's switching transistor Q3, turning on Q4, and turning off both Q4 and Q6. The first IoT card is selected for the reporting test. After the test, the module power supply is turned off by switching transistor Q3, and transistor V8 is turned on to discharge the load, allowing the capacitor voltage to drop rapidly to below 0.5V. If the voltage is 1V or higher, the NB-IoT module will fail to start. Switching transistor Q5 is then turned on, and switching transistors Q4 and Q6 are turned off. The second IoT card is then selected for the reporting test. The third IoT card test is conducted similarly. To ensure successful reporting across the three networks within a short time, a supercapacitor C14 provides stable power.

[0053] Specifically, in this embodiment, the ultrasonic IoT water meter signal tester further includes a communication power control circuit; the communication power control circuit is connected to the NB-IoT module and the main control module respectively; the communication power control circuit includes a switch Q3, a resistor R29, and a resistor R30; the gate of the switch Q3 is connected to the resistor R29 and the resistor R30 respectively, the other end of the resistor R29 is connected to the power supply terminal and the source of the switch Q3 respectively, the drain of the switch Q3 is connected to the NB-IoT module, and the other end of the resistor R30 is connected to the main control module.

[0054] Specifically, in this embodiment, the Bluetooth module includes a Bluetooth chip U6; pins 8 and 9 of the Bluetooth chip U6 are connected to resistors R27 and R28 respectively, and the other ends of resistors R27 and R28 are connected to the main control module; pin 14 of the Bluetooth chip U6 is connected to capacitor C18 and the drain of switching transistor Q2 respectively, the gate of switching transistor Q2 is connected to resistors R25 and R26 respectively, the source of switching transistor Q2 is connected to the other end of resistor R26 and the power supply terminal respectively, and the other end of resistor R25 is connected to the main control module; pin 15 of the Bluetooth chip and the other end of capacitor C18 are grounded; one end of the Bluetooth module is connected to the main control module, and the other end of the Bluetooth module can be connected to an external terminal. By connecting to the Bluetooth module through an external terminal, human-machine separation can be achieved. Control commands can be issued and data can be displayed on the terminal. Especially in a closed installation environment, the tester can completely simulate the actual application environment of the product by controlling the test through Bluetooth connection.

[0055] Specifically, in this embodiment, the button module includes a button K1; pin 1 of the button K1 is connected to resistors R6 and R7 respectively, the other end of resistor R6 is connected to the power supply, and the other end of resistor R7 is connected to capacitor C8 and the main control module respectively; pins 2, 3, and 4 of the button K1 and the other end of capacitor C8 are grounded; the button module adopts a one-button function for convenient operation. When the button press duration is greater than 1 second, the Bluetooth function is enabled; when the button press duration is greater than 5 seconds, the data of various IoT cards is synchronously reported in a short time, ensuring the real-time performance of the data.

[0056] Specifically, in this embodiment, the ultrasonic IoT water meter signal tester further includes an indicator light circuit; the input terminal of the indicator light circuit is connected to the output terminal of the main control module; the indicator light circuit includes LED2, LED3, resistor R16, and resistor R17; one end of LED2 is connected to LED3 and the power supply terminal respectively, the other end of LED2 is connected to resistor R16, the other end of resistor R16 is connected to the main control module, and the other end of LED3 is connected to the main control module through resistor R17; the indicator light circuit is used to indicate the running and stopping status of the tester through LED2 and LED3, and to monitor whether the power supply of the control circuit is normal.

[0057] Specifically, in this embodiment, the ultrasonic IoT water meter signal tester further includes a download port circuit; the download port circuit is connected to the main control module, and the download port circuit includes a socket XS1, pin 1 of the socket XS1 is grounded, pin 2 of the socket XS1 is short-connected to the power supply, pin 3 of the socket XS1 is connected to resistor R5 and the main control module respectively, pin 4 of the socket XS1 is connected to resistor R4 and the main control module respectively, the other ends of resistors R4 and R5 are connected to the power supply, and pin 5 of the socket XS1 is connected to the main control module; the download port circuit is used by the user to download data from the ultrasonic IoT water meter signal tester.

[0058] Specifically, in this embodiment, the NB-IoT module includes module U7;

[0059] Pin 1 of module U7 is connected to ground, the emitter of transistor V8, capacitors C19, C20, and C21, respectively. The base of transistor V8 is connected to resistor R45, the other end of which is connected to the main control module. The collector of transistor V8 is connected to resistor R31, the other end of which is connected to capacitors C19, C20, and C21, as well as pins 42 and 43 of module U7, respectively. Pins 11, 12, and 13 of module U7 are connected to the first IoT card. The second and third IoT cards are connected; pin 14 of module U7 is connected to the first card selection circuit, the second card selection circuit, and the third card selection circuit respectively; pins 15, 17, 18, and 19 of module U7 are connected to the communication serial port conversion circuit; pin 24 of module U7 is connected to capacitor C22 and the communication serial port conversion circuit respectively; in this utility model, module U7 adopts the China Mobile IoT module of model MN326-X. This utility model does not impose specific limitations, and the specific settings can be configured as needed.

[0060] Specifically, in this embodiment, the communication serial port conversion circuit is used to realize the conversion between different serial port communication protocols, and to trigger the device through specific signals or conditions to restore its working state;

[0061] The communication serial port conversion circuit includes transistors V5, V6, and V7, resistors R39, R40, R41, R42, and R43, diode D4, and diode D5.

[0062] The base of transistor V5 is connected to resistor R39, the other end of resistor R39 is connected to the main control module, the collector of transistor V5 is connected to pin 15 of module U7, and the emitter of transistor V5 is grounded.

[0063] The base of transistor V6 is connected to the main control module through resistor R40, the collector of transistor V6 is connected to pin 19 of module U7, and the emitter of transistor V6 is grounded.

[0064] The base of transistor V7 is connected to pin 24 of module U7 via resistor R43, the emitter of transistor V7 is connected to pin 18 of module U7, the collector of transistor V7 is connected to resistors R42 and R41 respectively, the other end of resistor R42 is connected to the power supply terminal, and the other end of resistor R41 is connected to the main control module.

[0065] The cathode of diode D4 is connected to the main control module, the anode of diode D4 is connected to resistor R44 and pin 17 of module U7, the other end of resistor R44 is connected to the cathode of diode D5, and the anode of diode D5 is connected to pin 24 of module U7.

[0066] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. An ultrasonic IoT water meter signal tester, characterized in that, include: The system comprises a main control module, a charging module, an NB-IoT module, a card selection module, a Bluetooth module, a button module, and a communication power control circuit. The input terminal of the main control module is electrically connected to the output terminal of the charging module. The output terminal of the main control module is electrically connected to the input terminals of the NB-IoT module, the card selection module, the Bluetooth module, and the button module, respectively. The output terminal of the NB-IoT module is electrically connected to the input terminal of the card selection circuit, and the output terminal of the card selection circuit is connected to multiple types of IoT cards. The communication power control circuit is electrically connected to both the main control module and the NB-IoT module.

2. The ultrasonic IoT water meter signal tester according to claim 1, characterized in that, The charging module includes a charging circuit, a power conversion circuit, and a battery voltage detection circuit; one end of the charging circuit is connected to an external power source through an interface, and the other end of the charging circuit is electrically connected to the power conversion circuit and the battery voltage detection circuit, respectively. Both the power conversion circuit and the battery voltage detection circuit are electrically connected to the main control module.

3. The ultrasonic IoT water meter signal tester according to claim 2, characterized in that, The charging circuit includes an interface U2; pins 2 and 11 of the interface U2 are connected to the TVS diode TV1, the power supply terminal, capacitor C9, pin 4 of the battery charging management chip U3, and resistor R9, respectively. The other end of resistor R9 is connected to the anode of LED1, and the cathode of LED1 is connected to pin 1 of the battery charging management chip U3; pin 5 of the battery charging management chip U3 is connected to resistor R8, and the other end of resistor R8, capacitor C9, and TVS diode TV1 is grounded; pin 2 of the battery charging management chip U3 is connected to the lithium battery and ground, respectively; pin 3 of the battery charging management chip U3 is connected to the power conversion circuit, the battery voltage detection circuit, and the lithium battery, respectively; pins 1, 12, 13, 14, 16, and 18 of the interface U2 are grounded.

4. The ultrasonic IoT water meter signal tester according to claim 2, characterized in that, The power conversion circuit includes a voltage regulator U4; pin 1 of the voltage regulator U4 is connected to resistor R10, the cathode of diode D1, the cathode of diode D2, and capacitor C10, respectively; the other end of resistor R10 is connected to pin 3 of the voltage regulator U4; the anode of diode D1 is connected to the lithium battery; and the anode of diode D2 is connected to the charging circuit; pin 5 of the voltage regulator U4 is connected to resistor R11 and capacitor C12, respectively; the other end of resistor R11 is connected to the main control module and capacitor C14, respectively; pin 4 of the voltage regulator U4 is connected to capacitor C11; and the other ends of capacitors C11, C12, C14, and C10 are grounded.

5. The ultrasonic IoT water meter signal tester according to claim 2, characterized in that, The battery voltage detection circuit includes transistors V1 and V2, resistors R12, R13, R14, R15, and capacitor C15. The emitter of transistor V1 is connected to the lithium battery, the base of transistor V1 is connected to resistor R13, the other end of resistor R13 is connected to the collector of transistor V2, and the base of transistor V2 is connected to the main control module through resistor R12. The collector of transistor V1 is connected to resistor R14, the other end of resistor R14 is connected to the main control module, resistor R15, and capacitor C15, respectively, and the emitter of transistor V2, the other end of resistor R15, and capacitor C15 are grounded.

6. An ultrasonic IoT water meter signal tester according to any one of claims 1-5, characterized in that, The card selection module includes a first card selection circuit, a second card selection circuit, and a third card selection circuit; the first card selection circuit, the second card selection circuit, and the third card selection circuit are electrically connected to various types of IoT cards, a main control module, and an NB-IoT module, respectively.

7. The ultrasonic IoT water meter signal tester according to claim 6, characterized in that, The first card selection circuit, the second card selection circuit, and the third card selection circuit have the same circuit structure. The first card selection circuit includes a switching transistor Q4; the gate of the switching transistor Q4 is connected to resistors R33 and R34 respectively, and the other end of resistor R34 is connected to the main control module; the source of the switching transistor Q4 is connected to the NB-IoT module and the other end of resistor R33 respectively; the drain of the switching transistor Q4 is connected to the first IoT card.

8. An ultrasonic IoT water meter signal tester according to any one of claims 1-5, characterized in that, The Bluetooth module includes a Bluetooth chip U6; Pins 8 and 9 of the Bluetooth chip U6 are connected to resistors R27 and R28 respectively, and the other ends of resistors R27 and R28 are connected to the main control module. Pin 14 of the Bluetooth chip U6 is connected to capacitor C18 and the drain of switching transistor Q2. The gate of switching transistor Q2 is connected to resistors R25 and R26. The source of switching transistor Q2 is connected to the other end of resistor R26 and the power supply terminal. The other end of resistor R25 is connected to the main control module. Pin 15 of the Bluetooth chip and the other end of capacitor C18 are grounded.

9. An ultrasonic IoT water meter signal tester according to any one of claims 1-5, characterized in that, The button module includes a button K1; pin 1 of the button K1 is connected to resistors R6 and R7 respectively, the other end of resistor R6 is connected to the power supply, and the other end of resistor R7 is connected to capacitor C8 and the main control module respectively; pins 2, 3, and 4 of the button K1 and the other end of capacitor C8 are grounded.

10. An ultrasonic IoT water meter signal tester according to any one of claims 1-5, characterized in that, The ultrasonic IoT water meter signal tester also includes an indicator light circuit; the input terminal of the indicator light circuit is connected to the output terminal of the main control module; the indicator light circuit includes LED2, LED3, resistor R16, and resistor R17; one end of LED2 is connected to LED3 and the power supply terminal respectively, the other end of LED2 is connected to resistor R16, the other end of resistor R16 is connected to the main control module, and the other end of LED3 is connected to the main control module through resistor R17.

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