Electromagnetic water meter power supply circuit

Abstract

The utility model relates to the field of electromagnetic water meters, and particularly discloses an electromagnetic water meter power supply circuit which comprises an external power supply, a voltage stabilization module, a voltage detection module, a built-in battery, a power supply switching module, an MCU power supply management module and a communication module. Wherein the voltage stabilization module is used for carrying out voltage reduction conversion on the voltage of an external power supply so as to prevent circuit devices from being burnt out; the voltage detection module is used for detecting the voltage of the built-in battery and the external power supply; the power supply switching module is used for controlling and selecting power supplies and also used for blocking cross conduction current between the two power supplies; the MCU power supply management module is used for supplying power to the MCU power supply management chip and the communication module; the built-in battery and the external power supply are used for supplying power to the electromagnetic water meter; and the communication module is used for carrying out data interaction with a water meter management system through a wireless network. According to the utility model, the error rate and the maintenance rate in the aspect of power supply are reduced, and material resources and manpower cost are saved.

Description

Technical Field

[0001] The utility model relates to the field of electromagnetic water meters, in particular to a power supply circuit for electromagnetic water meters. Background Art

[0002] Electromagnetic water meters have the advantages of low operating flow, large range ratio, small pressure loss, long-term stable metering accuracy, self-alarm function, automatic data reporting platform, etc. They can be installed in urban water supply pipelines, community master meters, water resource intake monitoring, industrial sites, etc. With the national policy support for smart water meters and market expansion, electromagnetic water meters have been widely used and popularized as one of the popular categories of smart water meters.

[0003] In actual use, although the electromagnetic water meter is powered by an internal independent lithium battery and is not affected by external power supply issues such as the mains power supply of the electromagnetic flowmeter, due to the complex working environment on site and inside the water meter, such as low signal strength, strong magnetic field, large circuit board current, high excitation frequency requirements, etc., the battery life will be limited by factors such as small fixed volume capacity, high power consumption of measurement and communication terminals, resulting in the battery life being far lower than the theoretical life. Therefore, how to provide long-term and stable power supply for electromagnetic water meters has become an urgent problem to be solved. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, the purpose of the utility model is to provide an electromagnetic water meter power supply circuit, and additionally provide an external power supply that can cross-power the internal lithium battery, and through the reasonable control of the power supply by the electromagnetic water meter MCU, the optimal configuration of the power supply of each working module of the water meter is achieved, so as to extend the actual use time of the electromagnetic water meter power supply and ensure the stability and sustainability of the power supply.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] An electromagnetic water meter power supply circuit, comprising:

[0007] External power supply, voltage stabilization module, voltage detection module, built-in battery, power switching module, MCU power management module and communication module;

[0008] Among them, the voltage stabilization module is used to step down the voltage of the external power supply to avoid burning out the circuit components; the voltage detection module is used to detect the voltage of the built-in battery and the external power supply; the power switching module is used to control the selection of the power supply, and is also used to block the cross-conduction current between the two power supplies; the MCU power management module is used to power the MCU power management chip and the communication module; the built-in battery and the external power supply are used to power the electromagnetic water meter; the communication module is used to exchange data with the water meter management system through a wireless network.

[0009] Preferably, the power switching module includes a power management chip and two semiconductor diodes; the power supply end of the built-in battery and the power supply end of the external power supply are respectively connected to input ends VIN1 and VIN2, and are connected to an enable end EN through the diodes.

[0010] Preferably, the model of the power management chip is GLF4020.

[0011] Preferably, the built-in battery is a lithium battery.

[0012] Preferably, the external power source is electrical energy converted from solar energy or wind energy.

[0013] Preferably, the MCU power supply management module comprises an MCU power supply management chip and four capacitors; the four capacitors are connected in parallel.

[0014] Preferably, the voltage detection module includes an external power supply detection circuit, a battery voltage detection circuit and an ADC conversion circuit.

[0015] Preferably, the voltage stabilization module is connected to the external power supply to stabilize the voltage output of the external power supply to 3.8V.

[0016] The beneficial effects of the utility model are:

[0017] Compared with the existing single power supply electromagnetic water meters on the market, an additional external power supply is provided and a power supply control selection device is used to select the power supply. On the one hand, it can extend the service life of the battery, reduce the error rate and maintenance rate of power supply, and save material and labor costs; on the other hand, solar power is used as an external power supply, and the energy source is renewable, pollution-free, and can be used sustainably. The power switching is controlled by the module, with fast response speed and automatic realization, without manual operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 This is a structural block diagram of a power supply system of an electromagnetic water meter provided by the utility model;

[0020] Figure 2 It is a circuit diagram of a power switching module in a power supply circuit of an electromagnetic water meter provided by an embodiment of the utility model;

[0021] Figure 3It is a circuit diagram of an MCU power supply management module in an electromagnetic water meter power supply circuit provided by an embodiment of the utility model;

[0022] Figure 4 It is a circuit diagram of a voltage stabilization module in a power supply circuit of an electromagnetic water meter provided by an embodiment of the utility model;

[0023] Figure 5 It is a circuit diagram of external power supply detection in an electromagnetic water meter power supply circuit provided by an embodiment of the utility model;

[0024] Figure 6 The utility model provides a circuit diagram of battery voltage detection in an electromagnetic water meter power supply circuit. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] The flowcharts shown in the accompanying drawings are only examples and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps may also be decomposed, combined or partially merged, so the actual execution order may change according to actual conditions.

[0027] In the description of the present invention, the terms "first / second" involved are merely used to distinguish similar objects and do not represent a specific order for the objects. It can be understood that "first / second" can be interchanged with a specific order or sequence where permitted, so that the embodiments of the present invention described herein can be implemented in an order other than that illustrated or described herein.

[0028] It should be understood that the orientation or position relationship is based on the orientation or position relationship shown in the drawings. These orientation terms 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0029] Below, the technical solutions in the embodiments of the present disclosure will be clearly and completely described in conjunction with the drawings in the embodiments of the present disclosure.

[0030] Figure 1This is a structural block diagram of a power supply system of an electromagnetic water meter provided by the utility model, which mainly includes an external power supply, a voltage stabilization module, a voltage detection module, a built-in battery, a power switching module, an MCU power supply management module and a communication module. Among them, the voltage stabilization module is used to step down the voltage of the external power supply to avoid burning out the circuit components; the voltage detection module is used to detect the voltage of the built-in battery and the external power supply; the power switching module is used to control the selection of the power supply, and is also used to block the cross-conduction current between the two power supplies; the MCU power supply management module is used to power the MCU power management chip and the communication module; the built-in battery and the external power supply are used to power the electromagnetic water meter; the communication module is used to exchange data with the water meter management system through a wireless network.

[0031] In a specific embodiment of the utility model, the external power source can be electric energy converted from solar energy or wind energy. Compared with the existing electromagnetic water meters with a single power supply on the market, the utility model provides an additional external power supply and uses a power supply control selection device to select the power supply. On the one hand, it can extend the battery life, reduce the error rate and maintenance rate in power supply, and save material and labor costs; on the other hand, solar energy and wind energy are used as external power sources. The energy source is renewable, pollution-free, and can be used sustainably, and the power switching is controlled by the module, with a fast response speed and automatic realization without manual operation.

[0032] At the same time, in a specific embodiment of the utility model, considering that the outer shell of the electromagnetic water meter is mostly made of metal, which will indirectly isolate the sunlight, and the actual installation environment of the electromagnetic water meter is buried underground or underground, the solar power supply panel can be designed as a transparent waterproof backpack and connected to a position where it can receive sunlight through a long wiring.

[0033] Figure 2 This is a circuit diagram of a power switching module in an electromagnetic water meter power supply circuit provided by an embodiment of the utility model. The power switching circuit includes a power management chip and two semiconductor diodes. Specifically, the model of the power management chip is GLF4020. VBAT is the internal lithium battery power supply terminal, POWER_IN is the external power supply terminal, which are respectively connected to the input terminals VIN1 and VIN2, and the enable terminal EN through the dual diode VD2. The diode ensures the unidirectional conduction of the power supply, so that the power supply terminal with a high voltage is turned on to enable the power switching module. The EN input terminal is used together with the SEL selection terminal, and the selection terminal SEL is grounded for automatic selection mode. In the automatic selection mode, GLF4020 automatically selects the higher input voltage source from the two input DC power supplies, which is equivalent to an analog switch. There is no need to perform additional voltage detection and comparison and cut off the circuit to control the power switching.

[0034] Figure 3This is a circuit diagram of an MCU power supply management module in an electromagnetic water meter power supply circuit provided by an embodiment of the utility model. The circuit mainly adopts a design of four capacitors in parallel. The parallel combination of capacitors plays a stabilizing role, which can remove the ripple generated when the power supply is switched, and charge the circuit when there is a short power outage in the step-down condition (i.e., switching from solar energy to lithium battery power supply).

[0035] Figure 4 This is a circuit diagram of a voltage stabilization module in an electromagnetic water meter power supply circuit provided by an embodiment of the utility model. When a solar power source is collected, the solar DC power supply is connected to the voltage stabilization module circuit. The operating voltage of the voltage stabilization module is 4.5V~28V input. At this time, the voltage value of the voltage stabilization module is reached, and it will be buck-converted and the output voltage will be stabilized. The module realizes synchronous buck conversion through an integrated circuit, and stabilizes the output of the solar power supply voltage POWER_IN to 3.8V. Among them, the input circuit F2 fuse will heat up and melt when a short circuit occurs, automatically cutting off the circuit to protect the circuit; the transient suppression diode TVS1 plays a protective role in overvoltage conditions; the enable end EN is connected to a resistor and the POWER end is connected in parallel with a capacitor to reduce the impedance of the high-frequency signal and improve the response speed.

[0036] Figure 5-6 It is a circuit diagram of a voltage detection module in an electromagnetic water meter power supply circuit provided by an embodiment of the utility model, specifically including an ADC conversion circuit, an external power supply detection circuit and a battery voltage detection circuit. The ADC conversion circuit converts the analog voltage signal into a digital signal that can be processed by the MCU, and can detect the voltage value when powered by solar energy or lithium battery, so as to determine which power supply is used; when solar energy is not collected, the external power supply voltage is 0, the lithium battery voltage is large, and the GLF will automatically select the lithium battery VBAT power supply end for power supply, and the enable end EN is also powered by the lithium battery VBAT power supply end. When solar energy is collected (the collected voltage value is ≤3.6V at this time), the internal circuit of the solar panel CN3767 charging management chip connected to the external power supply will switch between three different modes: trickle charging, floating charging, and new charging cycle. The typical charging voltage of this charging management module is 14.8V and 13.55V, which is higher than the lithium battery voltage, and is generally equipped with lead-acid batteries or colloidal batteries. At this time, GLF will automatically select the POWER_IN power supply terminal for power supply, and the enable terminal EN is also powered by the POWER_IN power supply terminal (the voltage value collected at this time is 3.8V).

[0037] The communication module exchanges data with the smart water platform through the operator network. The water meter and the platform follow the relevant data transmission protocol to transmit and analyze monitoring data, equipment parameters and other information. Based on the communication module, the water platform can monitor the water meter and understand the working status of the water meter in a timely manner.

[0038] It should be understood that the references to "one embodiment" or "an embodiment" throughout the specification mean that specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present disclosure. Therefore, the references to "in some embodiments" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0039] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0040] In the several embodiments provided in the present disclosure, it should be understood that the disclosed devices can be implemented in other ways. The device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as: multiple units or components can be combined, or can be integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the components shown or discussed can be through some interfaces, and the indirect coupling or communication connection of the devices or units can be electrical, mechanical or other forms.

[0041] The units described above as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units; they may be located in one place or distributed on multiple network units; some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0042] In addition, all functional units in the embodiments of the present disclosure may be integrated into one processing unit, or each unit may be separately configured as a unit, or two or more units may be integrated into one unit; the above-mentioned integrated units may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0043] The above description is only an implementation mode of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure.

[0044] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. An electromagnetic water meter power supply circuit, characterized in that: include: External power supply, voltage stabilization module, voltage detection module, built-in battery, power switching module, MCU power management module and communication module; Among them, the voltage stabilization module is used to step down the voltage of the external power supply to avoid burning out the circuit components; the voltage detection module is used to detect the voltage of the built-in battery and the external power supply; the power switching module is used to control the selection of the power supply, and is also used to block the cross-conduction current between the two power supplies; the MCU power management module is used to power the MCU power management chip and the communication module; the built-in battery and the external power supply are used to power the electromagnetic water meter; the communication module is used to exchange data with the water meter management system through a wireless network.

2. The electromagnetic water meter power supply circuit as claimed in claim 1, characterized in that: The power switching module includes a power management chip and two semiconductor diodes; the power supply end of the built-in battery and the power supply end of the external power supply are respectively connected to the input ends VIN1 and VIN2, and are connected to the enable end EN through the diodes.

3. The electromagnetic water meter power supply circuit as claimed in claim 2, characterized in that: The model of the power management chip is GLF4020.

4. The electromagnetic water meter power supply circuit as claimed in claim 1, characterized in that: The built-in battery is a lithium battery.

5. The electromagnetic water meter power supply circuit as claimed in claim 1, characterized in that: The external power source is electric energy converted from solar energy or wind energy.

6. The electromagnetic water meter power supply circuit as claimed in claim 1, characterized in that: The MCU power supply management module includes an MCU power supply management chip and four capacitors; the four capacitors are connected in parallel.

7. The electromagnetic water meter power supply circuit as claimed in claim 1, characterized in that: The voltage detection module includes an external power supply detection circuit, a battery voltage detection circuit and an ADC conversion circuit.

8. The electromagnetic water meter power supply circuit as claimed in claim 1, characterized in that: The voltage stabilization module is connected to the external power supply and outputs the voltage of the external power supply at a stable value of 3.8V.

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