Multichannel ultrasonic water meter metering circuit
By introducing inductive filtering circuits, electrostatic discharge circuits, precision RC filtering network circuits and high-speed switching circuits into the multi-channel ultrasonic water metering circuit, the system's own error problem in the multi-channel metering processing method in the prior art is solved, and precise metering and accurate positioning of flow field changes are achieved.
Patent Information
- Application Number
- CN202421499673.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-28
- Publication Date
- 2025-03-25
- Estimated Expiration
- 2034-06-28
AI Technical Summary
The existing multi-channel metering processing methods have system-owned errors, especially in small signal acquisition circuits, which leads to inaccurate measurements, especially in large-diameter water metering, which will cause large water bill differences.
A multi-channel ultrasonic water meter metering circuit was designed. By introducing inductive filtering circuits, electrostatic discharge circuits, precision RC filtering network circuits and high-speed switching circuits, the water meter metering algorithm is reasonably controlled, the influence of signal attenuation on metrology accuracy is reduced, and the sensor is protected through electrostatic discharge circuits to prevent electrostatic breakdown.
Accurate positioning of flow field changes and accurate measurement is achieved, reducing the impact of signal attenuation on metrology accuracy, and by protecting the sensor, the risk of electrostatic breakdown is reduced and the reliability of measurement is improved.
Smart Images
Figure CN222671133U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a multi-channel ultrasonic water meter measuring circuit. Background Art
[0002] In the prior art, the processing method for realizing multi-channel metering is: according to each channel sensor, a metering module is introduced to realize multi-channel metering; the defects of this method are: different sensors and introduced metering modules are different, for analog circuits, especially small signal acquisition circuits, system inherent errors will be generated, and large diameters, especially ultra-large diameters, will cause large differences in water charges.
[0003] Therefore, a multi-channel ultrasonic water meter measurement circuit is provided. Utility Model Content
[0004] The utility model aims to overcome the existing defects and provide a multi-channel ultrasonic water meter measurement circuit, which can realize accurate positioning of flow field changes and accurate measurement.
[0005] The technical solution to achieve the above purpose is:
[0006] A multi-channel ultrasonic water meter measurement circuit comprises: a plurality of sensor signal interfaces, each of the sensor signal interfaces is connected to an inductive filter circuit, one of the inductive filter circuits is connected to an electrostatic discharge circuit, one of the electrostatic discharge circuits is connected to a precision RC filter network circuit, a plurality of the precision RC filter network circuits are connected to a high-speed switching circuit, and the high-speed switching circuit is connected to an MCU unit.
[0007] Preferably, each of the sensor signal interfaces comprises four ports.
[0008] Preferably, each of the inductive filtering circuits includes an UP circuit and a DOWN circuit, each of the UP circuit and DOWN circuit is composed of two inductors and is respectively connected to the four ports of the sensor signal interface, and one of the UP circuit and DOWN circuit is respectively connected to one of the electrostatic discharge circuits.
[0009] Preferably, each of the electrostatic discharge circuits comprises a bidirectional TVS tube, one end of the TVS tube is grounded, and the other end is connected to the precision RC filter network circuit, the two inductors of the UP circuit are respectively connected to one end of the TVS tube, and the two inductors of the DOWN circuit are respectively connected to one end of another TVS tube.
[0010] Preferably, each of the precision RC filter network circuits includes a resistor and a capacitor, the capacitor is connected in parallel across the resistor, one end of the TVS tube is connected to one end of the resistor, and the other end of the resistor is connected to the high-speed switching circuit.
[0011] Preferably, the high-speed switching circuit includes a plurality of switches, each of the resistors is respectively connected to one of the switches, and the other end of the switch is connected to the MCU unit.
[0012] The beneficial effects of the utility model are as follows: since ultrasonic wave propagation is affected by distance, the larger the aperture, the weaker the signal reception; the multi-channel ultrasonic water meter measurement circuit provided by the present invention introduces an inductive filter circuit, an electrostatic discharge circuit, a precision RC filter network circuit and a high-speed switching circuit, and reasonably controls the water meter measurement algorithm, which can reduce the influence of signal attenuation on the measurement accuracy; the electrostatic discharge circuit is connected between the inductive filter circuit and the precision RC filter network circuit, which can effectively protect the sensor and prevent electrostatic breakdown; the sensor is selected for surveying and mapping through a high-speed switching circuit analog switch, which realizes measurement and calculation in one, and can reduce the difference caused by multi-channel measurement. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a module diagram of a multi-channel ultrasonic water meter measurement circuit of the utility model;
[0014] Figure 2 The utility model discloses a circuit diagram of each module diagram in a multi-channel ultrasonic water meter measurement circuit. DETAILED DESCRIPTION
[0015] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.
[0016] The utility model will be further described below in conjunction with the accompanying drawings.
[0017] like Figure 1 As shown, a multi-channel ultrasonic water meter measurement circuit is characterized in that it includes: multiple sensor signal interfaces 1, each sensor signal interface 1 is connected to an inductive filter circuit 2, an inductive filter circuit 2 is connected to an electrostatic discharge circuit 4, an electrostatic discharge circuit 4 is connected to a precision RC filter network circuit 3, multiple precision RC filter network circuits 3 are connected to a high-speed switching circuit 5, and the high-speed switching circuit 5 is connected to an MCU unit 6.
[0018] like Figure 2 As shown, each sensor signal interface 1 includes four ports connected to the inductance of the inductive filter circuit 2 .
[0019] like Figure 2 As shown, each inductive filter circuit 2 includes an UP circuit and a DOWN circuit. Each UP circuit and DOWN circuit consists of two inductors and is respectively connected to four ports of the sensor signal interface 1. One UP circuit and one DOWN circuit are respectively connected to an electrostatic discharge circuit 4.
[0020] like Figure 2 As shown, each electrostatic discharge circuit 4 includes a bidirectional TVS tube, one end of the TVS tube is grounded, and the other end is connected to the precision RC filter network circuit 3, the two inductors of the UP circuit are respectively connected to one end of the TVS tube, and the two inductors of the DOWN circuit are respectively connected to one end of another TVS tube; the electrostatic discharge circuit is connected between the inductive filter circuit and the precision RC filter network circuit, which can effectively protect the sensor and prevent electrostatic breakdown.
[0021] like Figure 2 As shown, each precision RC filter network circuit 3 includes a resistor and a capacitor, the capacitor is connected in parallel at both ends of the resistor, one end of the TVS tube is connected to one end of the resistor, and the other end of the resistor is connected to the high-speed switching circuit 5.
[0022] like Figure 2 As shown, the high-speed switching circuit 5 includes multiple switches, each resistor is connected to a switch, and the other end of the switch is connected to the MCU unit 6; the MCU unit 6 outputs a control signal according to the excitation voltage currently input to the simulator, so that the switch in the high-speed switching circuit 5 is switched to the selected sensor circuit for measurement, realizing measurement and calculation in one, and can reduce the difference caused by multi-channel measurement.
[0023] The above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model is described in detail with reference to the above embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above embodiments, or replace some or all of the technical features therein with equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.
Claims
1. A multi-channel ultrasonic water meter measuring circuit, characterized in that: include: A plurality of sensor signal interfaces (1), each of the sensor signal interfaces (1) being connected to an inductive filter circuit (2), one of the inductive filter circuits (2) being connected to an electrostatic discharge circuit (4), one of the electrostatic discharge circuits (4) being connected to a precision RC filter network circuit (3), a plurality of the precision RC filter network circuits (3) being connected to a high-speed switching circuit (5), and the high-speed switching circuit (5) being connected to an MCU unit (6).
2. A multi-channel ultrasonic water meter measuring circuit according to claim 1, characterized in that: Each of the sensor signal interfaces (1) comprises four ports.
3. A multi-channel ultrasonic water meter measuring circuit according to claim 2, characterized in that: Each of the inductive filter circuits (2) comprises an UP circuit and a DOWN circuit, each of the UP circuit and the DOWN circuit is composed of two inductors and is respectively connected to four ports of the sensor signal interface (1), and one of the UP circuit and the DOWN circuit is respectively connected to one of the electrostatic discharge circuits (4).
4. A multi-channel ultrasonic water meter measuring circuit according to claim 3, characterized in that: Each electrostatic discharge circuit (4) comprises a bidirectional TVS tube, one end of the TVS tube is grounded, and the other end is connected to the precision RC filter network circuit (3), the two inductors of the UP circuit are respectively connected to one end of the TVS tube, and the two inductors of the DOWN circuit are respectively connected to one end of another TVS tube.
5. A multi-channel ultrasonic water meter measuring circuit according to claim 4, characterized in that: Each of the precision RC filter network circuits (3) comprises a resistor and a capacitor, the capacitor is connected in parallel at both ends of the resistor, one end of the TVS tube is connected to one end of the resistor, and the other end of the resistor is connected to the high-speed switching circuit (5).
6. A multi-channel ultrasonic water meter measuring circuit according to claim 5, characterized in that: The high-speed switching circuit (5) comprises a plurality of switches, each of the resistors is respectively connected to one of the switches, and the other end of the switch is connected to the MCU unit (6).