Single-phase intelligent electric meter

Abstract

The utility model is suitable for the technical field of intelligent electric meters, and relates to a single-phase intelligent electric meter, which comprises a management MCU (Microprogrammed Control Unit), a metering IC (Integrated Circuit), a live wire current manganese-copper sampling module, a zero line current CT (Current Transformer) sampling module, a voltage sampling module and a power supply module, the live wire current manganese-copper sampling module, the zero line current CT sampling module and the voltage sampling module are electrically connected with the metering IC respectively; the management MCU and the metering IC are electrically connected with the power supply module respectively; the UART serial port communication circuit of the metering IC comprises a sending line TX used for data sending and a receiving line RX used for data receiving, the sending line TX is connected with a serial port receiving line of the management MCU, high-speed baud rate communication is adopted, high-speed optocoupler isolation is adopted, the receiving line RX is connected with a serial port sending line of the management MCU, low-speed baud rate communication is adopted, and low-speed optocoupler isolation is adopted. The utility model has the advantages of simple structure and high transmission efficiency, improves the metering IC data transmission capability, and greatly improves the ammeter data transmission rate.

Description

Technical Field

[0001] The utility model belongs to the technical field of smart electric meters, and in particular relates to a single-phase smart electric meter. Background Art

[0002] At present, mainstream single-phase smart meters in China all use the "management MCU + metering IC" implementation method. The UART serial port is used for communication between chips. The communication rate of the UART serial port is usually 9600bps or lower, resulting in very limited data obtained by the management MCU from the metering IC per unit time and a low data transmission rate.

[0003] The patent application with publication number CN105118258A provides a dual-mode communication smart energy meter and a centralized meter reading networking method, wherein the dual-mode communication smart energy meter includes: an MCU control module, a switching power supply module and an external communication module; the switching power supply module is a power board including a built-in communication module; the built-in communication module and the external communication module communicate with the MCU control module through their respective corresponding UART serial ports. This patent application realizes the dual-mode communication of the smart energy meter through two internal and external communication modules, and the two communication modules communicate with the MCU control module through two UART serial ports. The problem solved is the data congestion problem at the data interface of the energy meter caused by the dual-mode module using the same serial port in the prior art. However, the two-way communication still uses the ordinary UART serial port in the prior art, and the data transmission rate is low, which has the same disadvantages as the prior art.

[0004] Therefore, how to provide a smart electric meter with a high data transmission rate is an urgent problem to be solved by people in this technical field. Utility Model Content

[0005] In view of the deficiencies of the prior art, the purpose of the utility model is to provide a single-phase smart meter to solve the problem of low data transmission rate of the smart meter in the prior art.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] The utility model provides a single-phase smart electric meter, comprising:

[0008] Management MCU, metering IC, live current manganese copper sampling module, neutral current CT sampling module, voltage sampling module and power module, the management MCU is electrically connected to the metering IC, the live current manganese copper sampling module, neutral current CT sampling module, and voltage sampling module are electrically connected to the metering IC respectively, and the management MCU and metering IC are electrically connected to the power module respectively;

[0009] The UART serial communication circuit of the metering IC includes a transmission line TX for data transmission and a receiving line RX for data reception. The transmission line TX is connected to the serial port receiving line of the management MCU, adopts high-speed baud rate communication, and is isolated by a high-speed optical coupler. The receiving line RX is connected to the serial port transmission line of the management MCU, adopts low-speed baud rate communication, and is isolated by a low-speed optical coupler.

[0010] Furthermore, it also includes a key input module for human-computer interaction, and the key input module is electrically connected to the management MCU.

[0011] Furthermore, it also includes a liquid crystal display module for human-computer interaction, and the liquid crystal display module is electrically connected to the management MCU.

[0012] Furthermore, it also includes an ESAM encryption module for data encryption, and the ESAM encryption module is electrically connected to the management MCU.

[0013] Furthermore, it also includes an ESAM encryption module for data encryption and an internal card storage module for data storage, and the internal card storage module is electrically connected to the management MCU.

[0014] Furthermore, the model of the measurement IC is RN8209D.

[0015] Compared with the prior art, the single-phase smart electric meter provided by the utility model has at least the following beneficial effects:

[0016] In the prior art, smart meters all use the "management MCU + metering IC" implementation method, and the UART serial port is used for inter-chip communication. The communication rate of the UART serial port is usually 9600bps or lower, resulting in very limited data obtained by the management MCU from the metering IC per unit time, and a low data transmission rate. The utility model has a simple structure and efficient transmission, and adopts a UART serial communication method with a high-speed data transmission line and a low-speed data receiving line. This communication method optimizes the current mainstream low-speed UART serial communication. By increasing the metering IC serial port transmission line rate and retaining the receiving line rate, it not only reasonably guarantees the material cost, but also improves the metering IC data transmission capacity. The increase in data per unit time greatly improves the meter data transmission rate, allowing the management MCU to obtain power grid data in real time, which is conducive to further analysis of power grid harmonics and power quality related data. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the scheme of the utility model, a brief introduction is given below to the figures required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A structural block diagram of a single-phase smart meter provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0019] Unless otherwise defined, all technical and scientific terms used in this document have the same meaning as commonly understood by technicians in the technical field of the present invention; the terms used in this specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. For example, the directions or positions indicated by terms such as "length", "width", "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", and "outside" are based on the directions or positions shown in the drawings, which are only for the convenience of description and cannot be understood as limitations on the present technical solution.

[0020] The terms "including" and "having" and any variations thereof in the specification and claims of the utility model and the above-mentioned drawings are intended to cover non-exclusive inclusions; the terms "first", "second", etc. in the specification and claims of the utility model or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In the specification and claims of the utility model and the above-mentioned drawings, when an element is referred to as "fixed to" or "mounted on" or "disposed on" or "connected to" another element, it may be directly or indirectly located on the other element. For example, when an element is referred to as "connected to" another element, it may be directly or indirectly connected to the other element.

[0021] In addition, the reference to "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0022] The utility model provides a single-phase smart meter, which is applied in the process of collecting electricity consumption data. The single-phase smart meter includes:

[0023] Management MCU, metering IC, live current manganese copper sampling module, neutral current CT sampling module, voltage sampling module and power module. The management MCU is electrically connected to the metering IC. The live current manganese copper sampling module, neutral current CT sampling module and voltage sampling module are electrically connected to the metering IC respectively. The management MCU and metering IC are electrically connected to the power module respectively. The UART serial port communication circuit of the metering IC includes a transmitting line TX for data transmission and a receiving line RX for data reception. The transmitting line TX is connected to the serial port receiving line of the management MCU, adopts high-speed baud rate communication, and is isolated by a high-speed optical coupler. The receiving line RX is connected to the serial port transmitting line of the management MCU, adopts low-speed baud rate communication, and is isolated by a low-speed optical coupler.

[0024] The utility model has a simple structure and high transmission efficiency, improves the data transmission capacity of the measurement IC, and greatly improves the data transmission rate of the electric meter.

[0025] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiments of the utility model will be clearly and completely described below in conjunction with the accompanying drawings.

[0026] The utility model provides a single-phase smart meter, which is used in the process of collecting electricity consumption data, such as Figure 1 As shown, in this embodiment, the single-phase smart meter includes:

[0027] Management MCU, metering IC, live current manganese copper sampling module, neutral current CT sampling module, voltage sampling module and power module. The management MCU is electrically connected to the metering IC. The live current manganese copper sampling module, neutral current CT sampling module and voltage sampling module are electrically connected to the metering IC respectively. The management MCU and metering IC are electrically connected to the power module respectively. The power module supplies power to the smart meter. The management MCU interacts with the key input module and the LCD display module. The metering IC samples the electric energy data of the live current manganese copper sampling module, the neutral current CT sampling module and the voltage sampling module, and sends the processed data to the management MCU through the UART serial port. The metering IC adopts the Renergy company's type The chip No. is RN8209D, and the UART serial communication mode is adopted between the metering IC and the management MCU. The UART serial communication circuit of the metering IC includes a sending line TX for data transmission and a receiving line RX for data reception. The sending line TX is connected with the serial port receiving line of the management MCU, adopts high-speed baud rate communication, and is isolated by a high-speed optical coupler. The receiving line RX is connected with the serial port sending line of the management MCU, adopts low-speed baud rate communication, and is isolated by a low-speed optical coupler. Compared with the traditional low-speed UART transceiver communication mode, the communication mode in this embodiment increases the amount of data received by the management MCU per unit time, so that the management MCU can obtain more metering sampling data and perform harmonic and power quality analysis.

[0028] Furthermore, in this embodiment, it also includes a key input module, a liquid crystal display module, an ESAM encryption module and an internal card storage module that are electrically connected to the management MCU respectively. The key input module and the liquid crystal display module are used for human-computer interaction, the ESAM encryption module is used to implement the data encryption function of the electric meter, and the internal card storage module is used for data storage of the electric meter.

[0029] The single-phase smart meter described in the above embodiment is compared with the prior art. In the prior art, all smart meters use the "management MCU + metering IC" implementation method. The UART serial port is used for inter-chip communication. The communication rate of the UART serial port is usually 9600bps or lower, which results in very limited data obtained by the management MCU from the metering IC per unit time, and the data transmission rate is low. The utility model has a simple structure and efficient transmission. It adopts a UART serial communication method with a high-speed data transmission line and a low-speed data receiving line. This communication method optimizes the current mainstream low-speed UART serial communication. By increasing the metering IC serial port transmission line rate and retaining the receiving line rate, it not only reasonably guarantees the material cost, but also improves the metering IC data transmission capacity. The increase in data per unit time greatly improves the meter data transmission rate, so that the management MCU can obtain power grid data in real time, which is conducive to further analysis of power grid harmonics and power quality related data.

[0030] Obviously, the embodiments described above are only preferred embodiments of the utility model, rather than all embodiments. The preferred embodiments of the utility model are given in the accompanying drawings, but they do not limit the patent scope of the utility model. The utility model can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the utility model more thorough and comprehensive. Although the utility model is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to replace some of the technical features therein with equivalents. Any equivalent structure made using the contents of the utility model specification and the accompanying drawings, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the utility model.

Claims

1. A single-phase smart meter, characterized in that: include: Management MCU, metering IC, live current manganese copper sampling module, neutral current CT sampling module, voltage sampling module and power module, the management MCU is electrically connected to the metering IC, the live current manganese copper sampling module, neutral current CT sampling module, and voltage sampling module are electrically connected to the metering IC respectively, and the management MCU and metering IC are electrically connected to the power module respectively; The UART serial communication circuit of the metering IC includes a transmission line TX for data transmission and a receiving line RX for data reception. The transmission line TX is connected to the serial port receiving line of the management MCU, adopts high-speed baud rate communication, and is isolated by a high-speed optical coupler. The receiving line RX is connected to the serial port transmission line of the management MCU, adopts low-speed baud rate communication, and is isolated by a low-speed optical coupler.

2. The single-phase smart meter according to claim 1, characterized in that: It also includes a key input module for human-computer interaction, and the key input module is electrically connected to the management MCU.

3. The single-phase smart meter according to claim 2, characterized in that: It also includes a liquid crystal display module for human-computer interaction, and the liquid crystal display module is electrically connected to the management MCU.

4. The single-phase smart meter according to claim 1, characterized in that: It also includes an ESAM encryption module for data encryption, and the ESAM encryption module is electrically connected to the management MCU.

5. The single-phase smart meter according to claim 1, characterized in that: It also includes an internal card storage module for data storage, and the internal card storage module is electrically connected to the management MCU.

6. The single-phase smart meter according to claim 1, characterized in that: The model of the metering IC is RN8209D.

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