Ultrasonic dual-powered water meter with emc protection

Abstract

The present disclosure provides an ultrasonic dual power supply water meter with EMC protection, which comprises an EMC protection module, a first isolation filter module, a second isolation filter module, a battery, a power supply switching module, a control module, a metering module and a wireless communication module. The power supply switching module is used to enable the battery to supply power to the control module, the metering module and the wireless communication module when the mains power is disconnected. The ultrasonic dual power supply water meter with EMC protection provided by the present disclosure enables the water meter to realize automatic switching of dual power supply of mains power and battery, realizes seamless switching of power supply, guarantees the safety and stability of data, improves the anti-interference ability of the water meter, reduces the requirements of the infrared equipment on the environment during related operations, improves the applicability of the water meter, reduces the interference and damage of the mains power on each power module in the water meter, improves the accuracy of data, and increases the service life of the water meter.

Description

Technical Field

[0001] This disclosure relates to the field of smart water meter technology, and in particular to an ultrasonic dual-power water meter with EMC protection. Background Technology

[0002] Ultrasonic waves, characterized by high frequency, directionality, and strong anti-interference properties, can be used to measure fluid flow velocity. Existing ultrasonic dual-power water meters with EMC protection have the following drawbacks:

[0003] (1) Usually, a single power supply design is adopted. Water meters powered by the mains power will lose network and data when the mains power fails, resulting in poor stability. Water meters powered by pure batteries have short battery life and increased maintenance costs.

[0004] (2) Water meters usually require special infrared equipment for calibration and parameter configuration, which limits the application environment of water meters. Infrared equipment needs to be aligned in a straight line, which further increases the requirements for the working environment of calibration and configuration. Configuration generally requires the use of a host computer. In outdoor environments, only laptops can be used. Laptops have limited battery life, which causes inconvenience to water meter calibration and parameter configuration.

[0005] (3) The current ultrasonic dual-power water meters with EMC protection have no access control, and there is a great risk to data security.

[0006] (4) Water meters powered by mains electricity are susceptible to interference from power grid surges, pulse groups, voltage drops, etc., which can lead to abnormal data, system crashes, or even circuit board chip breakdown. The noise generated by the water meter itself can also pollute the power grid through the power line. Thunderstorms are more likely to damage the circuit board chip. Utility Model Content

[0007] This disclosure addresses the aforementioned issues by proposing an ultrasonic dual-power supply water meter with EMC protection.

[0008] To solve at least one of the above-mentioned technical problems, this disclosure proposes the following technical solution:

[0009] We offer ultrasonic dual-power water meters with EMC protection, including:

[0010] The system comprises an EMC protection module, a first isolation filter module, a second isolation filter module, a battery, a power switching module, a control module, a metering module, and a wireless communication module. The input of the EMC protection module is connected to the mains power. The output of the EMC protection module is connected to the input of the first isolation filter module. The output of the first isolation filter module is connected to the input of the second isolation filter module. The output of the second isolation filter module and the battery are connected to the power switching module. The output of the power switching module is connected to the power inputs of the control module, metering module, and wireless communication module. The power switching module enables the battery to power the control module, metering module, and wireless communication module when the mains power is disconnected. The wireless communication module is connected to the control module, and the metering module is also connected to the control module.

[0011] In some implementations, the EMC protection module includes a surge suppression circuit, a filter circuit, and a clamping circuit. The input terminal of the surge suppression circuit is connected to the mains power, the output terminal of the surge suppression circuit is connected to the input terminal of the filter circuit, the output terminal of the filter circuit is connected to the input terminal of the clamping circuit, and the output terminal of the clamping circuit serves as the output terminal of the EMC protection module and is connected to the first isolation filter module.

[0012] In some implementations, the surge suppression circuit is used to absorb surges and includes a gas discharge tube and a varistor. The gas discharge tube is connected to the protective grounding wire, and varistors are installed between each pair of the neutral wire, the live wire, and the protective grounding wire. The filtering circuit includes a common-mode filter. The input terminals of the common-mode filter are connected to the neutral wire and the live wire, respectively. The output terminal of the common-mode filter is connected to the input terminal of the AC / DC power module. The output terminal of the AC / DC power module is connected to a clamping circuit. The clamping circuit includes a diode, a ferrite bead, and a transient suppression diode. The diode is located at the input terminal of the clamping circuit, and the ferrite bead is located at the output terminal of the EMC protection module. One end of the transient suppression diode is connected to the ferrite bead, and the other end is grounded.

[0013] In some implementations, the first isolation filter module includes a linear voltage regulator chip U1, which is used to filter the input voltage once.

[0014] In some implementations, the second isolation filter module includes a transient suppression diode, a diode, and a capacitor connected in parallel. The second isolation filter module is used to perform secondary filtering and electrical isolation on the input voltage.

[0015] In some implementations, the power switching module includes a field-effect transistor (FET) Q1. The gate of the FET is connected to the output terminal of the second isolation filter module, the drain of the FET is connected to the battery, and the source of the FET is connected to the output terminal of the second isolation filter module through a diode. The source of the FET is connected to the power input terminals of the control module, the metering module, and the wireless communication module, respectively.

[0016] In some implementations, the wireless communication module is at least one of a Bluetooth chip or a 4G communication module, and the wireless communication module is communicatively connected to the control module.

[0017] In some implementations, the control module can obtain request information from the remote operation device through the wireless communication module. According to the preset request information level, the control module sends a verification command to the remote operation device through the wireless communication module. The control module judges the correctness of the verification information based on the verification information returned by the wireless communication module. Based on the result of the correctness judgment, the control module executes or does not execute the request information.

[0018] The beneficial effects of this disclosure are as follows: by setting up a power switching module, the water meter can automatically switch between mains power and battery power, achieving seamless power supply switching, ensuring data security and stability, and improving the water meter's anti-interference capability; by setting up a wireless communication module, remote water meter calibration and parameter configuration are achieved, reducing the environmental requirements of infrared devices when performing related operations and improving the applicability of the water meter; by setting up an EMC protection module, a first isolation filter module, and a second isolation filter module, interference and damage from mains power to various electrical modules in the water meter are reduced, improving data accuracy and increasing the water meter's service life.

[0019] Furthermore, unless otherwise specified in this disclosure, all technical solutions can be implemented using conventional methods in the field. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the specific embodiments of this disclosure or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of an ultrasonic dual-power water meter with EMC protection provided in one embodiment of the present disclosure.

[0022] Figure 2 The circuit diagram of the EMC protection module in an ultrasonic dual-power water meter with EMC protection provided in one embodiment of this disclosure is shown.

[0023] Figure 3 The circuit diagram of the first isolation filter module in an ultrasonic dual-power water meter with EMC protection provided in one embodiment of this disclosure is shown.

[0024] Figure 4The circuit diagram of the second isolation filter module in an ultrasonic dual-power water meter with EMC protection provided in one embodiment of this disclosure is shown.

[0025] Figure 5 This is a circuit diagram of a power switching module in an ultrasonic dual-power water meter with EMC protection, provided as an embodiment of the present disclosure. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this disclosure clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only some, not all, of the embodiments of this disclosure, and are used merely to explain this disclosure and are not intended to limit it. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without inventive effort are within the scope of protection of this disclosure.

[0027] It should be noted that the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or server that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0028] Example 1:

[0029] Reference manual attached Figure 1-5 This application illustrates an embodiment of an ultrasonic dual-power water meter with EMC protection, comprising: an EMC protection module 1, a first isolation filter module 2, a second isolation filter module 3, a battery 4, a power switching module 5, a control module 6, a metering module 7, and a wireless communication module 8.

[0030] The input terminal of EMC protection module 1 is connected to the mains power, the output terminal of EMC protection module 1 is connected to the input terminal of the first isolation filter module 2, the output terminal of the first isolation filter module 2 is connected to the input terminal of the second isolation filter module 3, and the output terminal of the second isolation filter module 3 is connected to the power switching module 5. Thus, the 220V mains power is sequentially converted into 3.3V DC power after passing through EMC protection module 1, the first isolation filter module 2, and the second isolation filter module 3, and then input to the power switching module 5.

[0031] Battery 4 is connected to power switching module 5. The output of power switching module 5 is connected to the power input of control module 6, metering module 7 and wireless communication module 8 respectively. Power switching module 5 is used to enable battery 4 to supply power to control module 6, metering module 7 and wireless communication module 8 when the mains power is disconnected. Wireless communication module 8 is connected to control module 6.

[0032] The ultrasonic transducer can be connected to the metering module 7, which calculates the flow rate. The metering module 7 is also connected to the control module 6 to send the metering results.

[0033] Reference manual attached Figure 2 In an optional embodiment, the EMC protection module 1 may include a surge suppression circuit, a filtering circuit, and a clamping circuit.

[0034] The input of the surge suppression circuit is connected to the mains power supply, which includes the live wire (L), neutral wire (N), and protective earth wire (PE). The protective earth wire (PE) is connected to the live wire (L) through a gas discharge tube (U4) and a varistor (R4). The protective earth wire (PE) is also connected to the neutral wire (N) through the gas discharge tube (U4) and a varistor (R3). A varistor (R2) is installed between the live wire (L) and the neutral wire (N). Therefore, when a surge voltage or pulse group is input from the live wire (L), the neutral wire (N), and the protective earth wire (PE), the gas discharge tube (U4) first breaks down and conducts, discharging most of the energy to the ground wire (PE). The varistors (R2, R3, and R4) further clamp the voltage. The surge suppression circuit can absorb high-voltage, high-energy surges caused by lightning strikes, inductive load switching, etc.

[0035] The output of the surge suppression circuit is connected to the input of the filter circuit, which includes a common-mode filter U5. The input of the common-mode filter U5 is connected to the live wire L and the neutral wire N, respectively, and is also connected to the input of the AC / DC power module U7. Therefore, the common-mode inductor in the common-mode filter U5 provides high impedance to high-frequency common-mode noise from both the preceding and following stages. Combined with the capacitor in the common-mode filter U5, this bypasses the noise to ground, effectively suppressing differential-mode and common-mode interference, especially high-frequency noise.

[0036] The U7 AC / DC power module is used to convert 220V AC power to 5V DC power. The AC / DC power module can be any AC / DC power module on the market that can convert 220V AC power to 5V DC power.

[0037] The output terminal of AC / DC power module U7 is connected to the input terminal of clamping circuit. Clamping circuit includes diode D5, diode D7, ferrite bead L2, and transient suppression diode D0. The anode of diode D5 is connected to the positive output terminal of AC / DC power module U7, and the cathode of diode D7 is connected to the negative output terminal of AC / DC power module U7. The cathode of diode D5 is connected to the output terminal of EMC protection module 1 via inductor L1 and ferrite bead L2, and is connected to the first isolation filter module 2. The output terminal of EMC protection module 1 outputs a 5V DC voltage.

[0038] The anode of diode D7 is grounded, one end of transient suppression diode D0 is grounded, and the other end is connected to the end of ferrite bead L2 that is not connected to the first isolation filter module 2. Ferrite bead L2 is used to filter out high-frequency noise on the power line and chip. Diodes D5, D7, and transient suppression diode D0 quickly clamp electrostatic discharge or fast transient pulse groups that may be encountered at the port of AC / DC power module U7 to a safe voltage, protecting the DC output of AC / DC power module U7.

[0039] Therefore, the AC / DC power module used in EMC protection module 1 isolates the mains power from the various power modules of the water meter, completely cuts off the interference path, reduces the impact of unstable interference factors in the mains power on the water meter, improves the reliability and stability of water meter measurement, and extends the service life of the water meter.

[0040] In an optional embodiment, the first isolation filter module 2 includes a linear voltage regulator chip U1, which is used to filter the input voltage once. The first isolation filter module 2 is used to convert the unstable and noisy 5V DC power supply from the previous stage into a clean and stable 3.3V DC power supply, and to provide basic surge and noise protection for the subsequent stages.

[0041] The linear regulator chip U1 can be selected as the LM1117-3.3. The linear regulator chip U1 is used to stabilize a 5V input voltage to an output voltage of 3.3V. Linear regulator chips have lower noise and faster response.

[0042] The input terminal of the linear voltage regulator chip U1 is grounded through capacitors C1 and C2 connected in parallel. Capacitor C1 can quickly discharge the high-frequency energy generated by static electricity to ground. Capacitor C2 is connected in parallel to the output terminal of the linear voltage regulator chip U1, which can make the output of the linear voltage regulator chip U1 more stable and filter out low- and mid-frequency noise. When used with capacitor C1, it can achieve noise filtering over a wider frequency range.

[0043] The input terminal of the linear regulator chip U1 is grounded through the transient suppression diode U2, which provides electromagnetic compatibility protection.

[0044] The linear regulator chip U1 also has diodes D1 and D2 at its input terminal. Diodes D1 and D2 are used to clamp the pulse voltage and protect the electronic components.

[0045] Reference manual attached Figure 4In an optional embodiment, the second isolation filter module 3 includes a transient suppression diode U3, a diode D3, a capacitor C3, and a capacitor C4. The second isolation filter module 3 is used for secondary filtering and electrical isolation of the 3.3V voltage output by the linear regulator chip U1. The transient suppression diode U3 can remove interference from surges and pulse groups, and when combined with the 1N4148 diode D3, complete isolation of pulse groups is achieved. The capacitor C3 can match the electrostatic test frequency filtering, further improving measurement accuracy and anti-interference capability.

[0046] Battery 4 can be a lithium battery.

[0047] In an optional embodiment, the power switching module 5 includes a field-effect transistor Q1. The gate of the field-effect transistor Q1 is connected to the output terminal of the second isolation filter module 3, the drain of the field-effect transistor Q1 is connected to the battery 4, and the source of the field-effect transistor Q1 is connected to the output terminal of the second isolation filter module 3 through a diode D4. The source of the field-effect transistor Q1 is connected to the power input terminals of the control module 6, the metering module 7, and the wireless communication module 8, respectively.

[0048] When mains power is available, the output voltage of the second isolation filter module 3 is current-limited by resistor R1, and the gate voltage of the field-effect transistor Q1 is at a high level. At this time, the 3.3V DC voltage output by the second isolation filter module 3 supplies power to the control module 6, metering module 7 and wireless communication module 8 through diode D4. The field-effect transistor Q1 can also prevent the 3.3V DC voltage from flowing to the battery.

[0049] When the mains power is disconnected, the gate voltage of the field-effect transistor Q1 is low, and the field-effect transistor Q1 is turned on. At this time, the battery supplies power to the control module 6, the metering module 7 and the wireless communication module 8 through the turned-on field-effect transistor Q1.

[0050] In an optional embodiment, the control module 6 may be a microcontroller of model FM33LG048.

[0051] In an optional embodiment, the metering module 7 may be an ultrasonic metering chip of model MS1030.

[0052] In an optional embodiment, the wireless communication module 8 is at least one of a Bluetooth chip or a 4G communication module, and the wireless communication module 8 is communicatively connected to the control module 6.

[0053] This increases the communication distance between water meters and remotely operated equipment in industrial environments, thereby improving the applicability of water meters.

[0054] In an optional embodiment, the control module 6 can communicate with a remote operating device via the wireless communication module 8. The remote operating device includes, but is not limited to, mobile phones, tablets, desktop computers, and laptops.

[0055] Taking a mobile phone as an example, a corresponding APP, Alipay mini-program, or WeChat mini-program can be installed on the phone to communicate with the control module 6 through the wireless communication module 8 on the water meter. When the wireless communication module 8 is a Bluetooth chip, a Bluetooth serial port transparent transmission chip of model CH9141K can be used.

[0056] The control module 6 allows for the pre-setting of the relationships between request information, permissions, and verification information. For example, when an operator sends a request on their mobile phone, the request information can be categorized into three types: data query, parameter setting, and curve calibration, corresponding to Level 1, Level 2, and Level 3 permissions, respectively. Level 1 permissions require no verification or no password verification, Level 2 permissions require password verification and / or fingerprint verification, and Level 3 permissions, in addition to Level 2 permission verification, also require Level 2 password verification and verification against accidental touches.

[0057] Therefore, the control module 6 can obtain the request information sent by the remote operation device through the wireless communication module 8. According to the preset request information level, the control module 6 sends the verification command corresponding to the permission level to the remote operation device through the wireless communication module 8. The control module 6 judges the correctness of the verification information based on the verification information returned by the wireless communication module 8. Based on the result of the correctness judgment of the verification information, the control module 6 executes or does not execute the request information.

[0058] For example, when an operator sends a data query request on their mobile phone, control module 6 may execute the data query request without sending verification information. Alternatively, control module 6 may send a simple graphical verification message. If the verification information received by control module 6 is correct, control module 6 executes the data query request. If the verification information received by control module 6 is incorrect, control module 6 does not execute the data query request.

[0059] When the operator sends a request on the mobile phone that is a parameter setting request, such as a pipe diameter setting request, the control module 6 can send at least one of password verification information and fingerprint verification information. When the verification information received by the control module 6 is correct, the control module 6 executes the parameter setting request. When the verification information received by the control module 6 is incorrect, the control module 6 does not execute the parameter setting request.

[0060] When an operator sends a request on their mobile phone that is a curve calibration request, such as a traffic curve calibration request, the control module 6 can send at least one of password verification information and fingerprint verification information. If the verification information received by the control module 6 is incorrect, the control module 6 will not execute the curve calibration request. If the verification information received by the control module 6 is correct, the control module 6 will continue to send secondary password verification and non-accidental touch verification information. When both the secondary password verification and non-accidental touch verification received by the control module 6 are correct, the control module 6 will execute the curve calibration request.

[0061] Therefore, by managing permissions through the control module 6, it is possible to effectively prevent operators or third parties from tampering with the key data of the water meter, thereby improving the security and reliability of the water meter.

[0062] The beneficial effects of this disclosure are as follows: by setting up a power switching module, the water meter can automatically switch between mains power and battery power, achieving seamless power supply switching, ensuring data security and stability, and improving the water meter's anti-interference capability; by using a wireless communication module, remote water meter calibration and parameter configuration are achieved, reducing the environmental requirements of infrared devices during related operations, improving the water meter's applicability, and reducing configuration costs; through the setting of EMC protection modules, first isolation filter modules, and second isolation filter modules, multiple filtering, surge suppression, and isolation protection ensure stable operation of the water meter in complex electromagnetic environments, reduce mains power interference and damage to various electrical modules in the water meter, improve data accuracy, and increase the water meter's service life.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit them. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this disclosure.

Claims

1. An ultrasonic dual powered water meter with EMC protection, characterized in that, include: The system comprises an EMC protection module (1), a first isolation filter module (2), a second isolation filter module (3), a battery (4), a power switching module (5), a control module (6), a metering module (7), and a wireless communication module (8). The input terminal of the EMC protection module (1) is connected to the mains power, the output terminal of the EMC protection module (1) is connected to the input terminal of the first isolation filter module (2), and the output terminal of the first isolation filter module (2) is connected to the input terminal of the second isolation filter module (3). The output of the second isolation filter module (3) and the battery (4) are respectively connected to the power switching module (5). The output of the power switching module (5) is respectively connected to the power input of the control module (6), the metering module (7) and the wireless communication module (8). The power switching module (5) is used to enable the battery (4) to supply power to the control module (6), the metering module (7) and the wireless communication module (8) when the mains power is disconnected. The wireless communication module (8) is connected to the control module (6). The metering module (7) is connected to the control module (6).

2. The ultrasonic dual powered water meter with EMC protection according to claim 1, characterized in that, The EMC protection module (1) includes a surge suppression circuit, a filter circuit, and a clamping circuit. The input terminal of the surge suppression circuit is connected to the mains power, the output terminal of the surge suppression circuit is connected to the input terminal of the filter circuit, the output terminal of the filter circuit is connected to the input terminal of the clamping circuit, and the output terminal of the clamping circuit is connected to the first isolation filter module (2) as the output terminal of the EMC protection module (1).

3. The ultrasonic dual-power water meter with EMC protection according to claim 2, characterized in that, The surge suppression circuit is used to absorb surges and includes a gas discharge tube and a varistor. The gas discharge tube is connected to the protective grounding wire, and varistors are installed between each pair of the neutral wire, the live wire, and the protective grounding wire. The filtering circuit includes a common-mode filter, whose input terminals are connected to the neutral and live wires, respectively. The output terminal of the common-mode filter is connected to the input terminal of the AC / DC power module, and the output terminal of the AC / DC power module is connected to the clamping circuit. The clamping circuit includes a diode, a ferrite bead, and a transient suppression diode. The diode is located at the input end of the clamping circuit, and the ferrite bead is located at the output end of the EMC protection module (1). One end of the transient suppression diode is connected to the ferrite bead, and the other end is grounded.

4. The ultrasonic dual-power water meter with EMC protection according to claim 1, characterized in that, The first isolation filter module (2) includes a linear voltage regulator chip U1, and the first isolation filter module (2) is used to filter the input voltage once.

5. The ultrasonic dual-power water meter with EMC protection according to claim 1, characterized in that, The second isolation filter module (3) includes a transient suppression diode, a diode and a capacitor, which are connected in parallel. The second isolation filter module (3) is used to perform secondary filtering and electrical isolation on the input voltage.

6. The ultrasonic dual-power water meter with EMC protection according to claim 1, characterized in that, The power switching module (5) includes a field-effect transistor Q1. The gate of the field-effect transistor is connected to the output terminal of the second isolation filter module (3). The drain of the field-effect transistor is connected to the battery (4). The source of the field-effect transistor is connected to the output terminal of the second isolation filter module (3) through a diode. The source of the field-effect transistor is connected to the power input terminals of the control module (6), the metering module (7), and the wireless communication module (8), respectively.

7. The ultrasonic dual-power water meter with EMC protection according to claim 1, characterized in that, The wireless communication module (8) is at least one of a Bluetooth chip or a 4G communication module, and the wireless communication module (8) is communicatively connected to the control module (6).

8. The ultrasonic dual-power water meter with EMC protection according to claim 7, characterized in that, The control module (6) can obtain the request information of the remote operation device through the wireless communication module (8). The control module (6) sends a verification command to the remote operation device through the wireless communication module (8) according to the preset request information level. The control module (6) judges the correctness of the verification information based on the verification information returned by the wireless communication module (8). The control module (6) executes or does not execute the request information based on the result of the correctness judgment of the verification information.

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