Intelligent electric meter based on current and voltage sampling

Abstract

The utility model relates to an intelligent electric meter based on current and voltage sampling, and the electric meter comprises an electric meter housing which is used for packaging internal devices of the electric meter; the acquisition board is fixedly arranged in the electric meter shell, and a current sampling circuit, a voltage sampling circuit, an analog-to-digital conversion circuit and a data processing unit are integrated in the acquisition board; the current sampling circuit is used for measuring current and comprises a sampling resistor, a power battery, a positive bus, a negative bus, a positive charging end, a negative charging end and a plurality of loads. The intelligent electric meter based on current and voltage sampling has the capability of measuring current and voltage in real time and calculating electric energy consumption through data processing, also has the functions of data storage, display and communication, can realize accurate electric energy monitoring and management service, improves the accuracy and reliability of electric energy measurement, and is suitable for popularization and application. And a convenient electric energy monitoring service is provided.

Description

Technical Field

[0001] The utility model relates to the technical field of smart meters, in particular to a smart meter based on current and voltage sampling. Background Art

[0002] With the development of society, new energy vehicles are becoming more and more popular. New energy vehicles mainly change the way of providing power by traditional gasoline and diesel, and use electric energy to provide power for vehicles. Compared with diesel and gasoline, electric energy is relatively more environmentally friendly.

[0003] With the popularization of new energy vehicles, charging piles are also gradually popularized. An electric vehicle intelligent charging pile is a system for charging electric vehicles, and a smart meter is a device for measuring and monitoring power consumption. Traditional meters usually only provide the reading of the total power consumption and cannot monitor power consumption in real time or provide detailed power consumption information. In recent years, with the intelligent and automated development of the power system, smart meters have gradually replaced traditional meters and become an important part of the power system.

[0004] Existing smart meters usually measure current and voltage data through a current transformer (CT) and a voltage transformer (VT), and calculate the power consumption through a data processing circuit. These smart meters usually have data storage and can transmit the data to a server or user equipment for users to query and analyze.

[0005] However, currently during the charging stage, the charging gun is connected to the positive busbar, to the power battery, and returns to the charging negative through a sampling resistor and then through the negative busbar. The reference ground of the sampling circuit is the charging negative, and the ground is stable; during the non-charging stage, the charging gun is disconnected, the reference ground of the sampling circuit is the charging negative, and the charging negative is in a floating state, with unstable voltage, which will cause ground fluctuations, and the acquisition circuit will acquire false voltages, resulting in false alarms, as Figure 3 shown. Summary of the Utility Model

[0006] Therefore, the technical problem to be solved by the utility model is to overcome the problem that there may be certain errors in the power calculation of smart meters in the prior art and the product quality needs to be continuously improved.

[0007] To solve the above technical problems, the present utility model provides an intelligent electric meter based on current and voltage sampling, comprising: an electric meter outer casing for encapsulating the internal components of the electric meter; a collection board fixedly arranged inside the electric meter outer casing, wherein a current sampling circuit, a voltage sampling circuit, an analog-to-digital conversion circuit and a data processing unit are integrated in the collection board; the current sampling circuit is used for measuring current, and the current sampling circuit comprises a sampling resistor, a power battery, a positive bus bar, a negative bus bar, a positive charging terminal, a negative charging terminal and a plurality of loads, the positive charging terminal is connected to one end of the power battery through the positive bus bar after being connected in series with the sampling resistor, the negative charging terminal is connected to the other end of the power battery through the negative bus bar, the plurality of loads are connected in parallel and then connected in series to both ends of the power battery, and the positive bus bar serves as the reference ground of the current sampling circuit. The intelligent electric meter based on current and voltage sampling of the present utility model is an intelligent meter for calculating electric energy based on current and voltage sampling, so as to improve the accuracy and reliability of electric energy measurement.

[0008] In an embodiment of the present utility model, a switch is provided between the plurality of loads connected in parallel and the power battery connected in series.

[0009] In an embodiment of the present utility model, the voltage sampling circuit is used for measuring voltage.

[0010] In an embodiment of the present utility model, the analog-to-digital conversion circuit is used for converting the analog signals of current and voltage into digital signals.

[0011] In an embodiment of the present utility model, the data processing unit is used for receiving the digital signals output by the analog-to-digital converter, calculating the instantaneous power and integrating the instantaneous power to obtain the electric energy consumption.

[0012] In an embodiment of the present utility model, a remote data terminal module is provided inside the electric meter outer casing, and the remote data terminal module is used for storing the calculated electric energy consumption and historical data.

[0013] In an embodiment of the present utility model, a display module is provided inside the electric meter outer casing, and the display module is used for displaying the electric energy consumption value in real time.

[0014] In an embodiment of the present utility model, a communication module is provided inside the electric meter outer casing, and the communication module transmits data in a wired or wireless manner to realize communication with external devices.

[0015] In an embodiment of the present utility model, the data processing unit comprises an electric energy calculation module and a data management module.

[0016] In an embodiment of the present utility model, the electric energy calculation module is used to calculate the instantaneous power and integrate the instantaneous power to obtain the electric energy consumption, and the data management module is used to manage the storage and transmission of electric energy data.

[0017] The above technical solution of the present utility model has the following beneficial effects compared with the prior art:

[0018] The intelligent electric meter based on current and voltage sampling described in the present utility model includes a current and voltage sampling circuit, a signal processing unit, a data calculation unit, a data transmission module, a display unit, and a data storage unit. It has the ability to measure current and voltage in real time and calculate the electric energy consumption through data processing. The intelligent electric meter also has functions of data storage, display, and communication, can realize accurate electric energy monitoring and management services, improve the accuracy and reliability of electric energy measurement, and provide convenient electric energy monitoring services. Description of the Drawings

[0019] In order to make the content of the present utility model easier to be clearly understood, the following further details the present utility model according to the specific embodiments of the present utility model in conjunction with the drawings, where

[0020] Figure 1 is the mechanical structure diagram of the intelligent electric meter based on current and voltage sampling in the preferred embodiment of the present utility model;

[0021] Figure 2 is the schematic diagram of the current sampling circuit in the preferred embodiment of the present utility model;

[0022] Figure 3 is the schematic diagram of the prior art of the current sampling circuit in the preferred embodiment of the present utility model.

[0023] Description of the reference numerals in the drawings: meter housing 100, acquisition board 1, sampling resistor 11, power battery 12, positive busbar 13, negative busbar 14, positive charging terminal 15, negative charging terminal 16, load 17, switch 18, remote data terminal module 2, display module 3, high-voltage negative interface 4, high-voltage positive current outlet 5, high-voltage positive current inlet 6, shunt 7, low-voltage interface 8. Detailed Embodiments

[0024] The following further illustrates the present utility model in conjunction with the drawings and specific embodiments, so that those skilled in the art can better understand the present utility model and be able to implement it, but the embodiments cited do not limit the present utility model.

[0025] Refer to Figure 1 、 2As shown in the figure, the intelligent electric meter based on current and voltage sampling of the present utility model includes: an electric meter outer casing 100 for encapsulating internal devices of the electric meter; a collection board 1 fixedly arranged inside the electric meter outer casing 100. The collection board 1 integrates a current sampling circuit, a voltage sampling circuit, an analog-to-digital conversion circuit, and a data processing unit. The current sampling circuit is used to measure current, and the current sampling circuit includes a sampling resistor 11, a power battery 12, a positive bus bar 13, a negative bus bar 14, a positive charging terminal 15, a negative charging terminal 16, and several loads 17. The positive charging terminal 15 is connected in series with the sampling resistor 11 and then connected to one end of the power battery 12 through the positive bus bar 13. The negative charging terminal 16 is connected to the other end of the power battery 12 through the negative bus bar 14. The several loads 17 are connected in parallel and then connected in series to both ends of the power battery 12. The positive bus bar 13 serves as the reference ground of the current sampling circuit. A switch 18 is provided between the several loads 17 connected in parallel and the power battery 12 connected in series. The bus bar current collection is to connect a high-precision sampling resistor to the high-voltage positive bus bar, and the high-voltage positive pole serves as the reference ground of the sampling circuit (most on the market are connected to the high-voltage negative bus bar, with the high-voltage negative pole serving as the reference ground of the sampling circuit).

[0026] The above-mentioned sampling resistor is on the positive bus bar, as Figure 2 shown:

[0027] During the charging stage, the charging gun is connected to the sampling resistor, passes through the positive bus bar, reaches the power battery, and returns to the negative charging through the negative bus bar. The reference position of the sampling circuit is the high-voltage positive bus bar, and the ground is stable; during the non-charging stage, the charging gun is disconnected, and the reference ground of the sampling circuit is the positive bus bar, and the voltage is stable, which will not cause ground fluctuations either.

[0028] The above-mentioned voltage sampling circuit is used to measure voltage. The analog-to-digital conversion circuit is used to convert the analog signals of current and voltage into digital signals. VT converts the measured voltage into a voltage signal with a smaller ratio and transmits it to the subsequent signal processing circuit.

[0029] The above-mentioned analog-to-digital conversion circuit is used to receive the analog signals from the current and voltage sampling circuits, convert them into digital signals for use by the subsequent data processing unit.

[0030] The above-mentioned data processing unit is used to receive the digital signals output by the analog-to-digital converter, calculate the instantaneous power, and integrate the instantaneous power to obtain the power consumption. The data processing unit includes an electric energy calculation module and a data management module. The electric energy calculation module is used to calculate the instantaneous power and integrate the instantaneous power to obtain the power consumption. The data management module is used to manage the storage and transmission of electric energy data.

[0031] Inside the above-mentioned electricity meter housing 100, there is a remote data terminal module 2, and the remote data terminal module 2 is used to store the calculated power consumption and historical data. The data storage unit can adopt flash memory or other data storage devices to save data for a long time. Inside the electricity meter housing 100, there is a display module 3, and the display module 3 is used to display the power consumption value in real time. The display module 3 is usually a liquid crystal display or an LED screen, which is convenient for users to view the electricity meter reading and other information.

[0032] Inside the electricity meter housing 100, there is a communication module. The communication module transmits data through wired or wireless means to achieve communication with external devices. The CAN communication protocol is adopted to meet the communication on vehicles.

[0033] In addition, on the electricity meter housing 100, there are a high-voltage negative interface 4, a high-voltage positive current outlet 5, a high-voltage positive current inlet 6, a shunt 7 for collecting current signals, and a low-voltage interface 8. The low-voltage interface 8 is an interface for providing the working power supply of the electricity meter and external communication.

[0034] Obviously, the above embodiments are only examples for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present utility model.

Claims

1. A smart meter based on current and voltage sampling, characterized in that: include, The outer shell of the electric meter is used to encapsulate the internal components of the electric meter; The acquisition board is fixedly arranged in the outer shell of the electric meter, and the acquisition board integrates a current sampling circuit, a voltage sampling circuit, an analog-to-digital conversion circuit and a data processing unit; The current sampling circuit is used to measure current, and the current sampling circuit includes a sampling resistor, a power battery, a positive bus, a negative bus, a positive charging terminal, a negative charging terminal and a plurality of loads. The positive charging terminal is connected in series with the sampling resistor and then connected to one end of the power battery through the positive bus. The negative charging terminal is connected to the other end of the power battery through the negative bus. The plurality of loads are connected in parallel and then connected in series to the two ends of the power battery. The positive bus serves as a reference ground for the current sampling circuit.

2. The smart electric meter based on current and voltage sampling according to claim 1 is characterized in that: A switch is provided between the plurality of loads connected in parallel and the power batteries connected in series.

3. The smart electric meter based on current and voltage sampling according to claim 1, characterized in that: The voltage sampling circuit is used to measure voltage.

4. The smart electric meter based on current and voltage sampling according to claim 1, characterized in that: The analog-to-digital conversion circuit is used to convert analog signals of current and voltage into digital signals.

5. The smart electric meter based on current and voltage sampling according to claim 1, characterized in that: The data processing unit is used for receiving the digital signal output by the analog-to-digital converter, calculating the instantaneous power and integrating the instantaneous power to obtain the electric energy consumption.

6. The smart electric meter based on current and voltage sampling according to claim 1, characterized in that: A remote data terminal module is arranged in the outer shell of the electric meter, and the remote data terminal module is used to store the calculated electric energy consumption and historical data.

7. The smart electric meter based on current and voltage sampling according to claim 1, characterized in that: A display module is arranged in the outer shell of the electric meter, and the display module is used for displaying the electric energy consumption value in real time.

8. The smart electric meter based on current and voltage sampling according to claim 1, characterized in that: A communication module is arranged in the outer shell of the electric meter, and the communication module transmits data via a wired or wireless method to achieve communication with external equipment.

9. The smart electric meter based on current and voltage sampling according to claim 1, characterized in that: The data processing unit includes an electric energy calculation module and a data management module.

10. The smart electric meter based on current and voltage sampling according to claim 9, characterized in that: The electric energy calculation module is used to calculate instantaneous power and integrate the instantaneous power to obtain electric energy consumption, and the data management module is used to manage the storage and transmission of electric energy data.

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