CN204649816U - A kind of intelligent electric meter - Google Patents

Abstract

The utility model discloses a kind of intelligent electric meter, comprise: electric current and voltage sampling module, EMI filtration module, key-press module, system power failure detection/battery undervoltage detection module, electric energy metering module, RS485 communication interface, display module, storage unit, clock module, infrared communication interface, automatic alarm module, controller, adopt 32 High Performance SCM LPC1766 to be core controller, coordinate peripheral circuit to realize multi-functional, the high reliability of electric energy meter; Compared with prior art, the utility model has reasonable in design, and high performance controller and domestic computation chip realize intelligent electric meter, and cost performance is high, have wide market outlook.

Description

a smart meter

technical field

The utility model belongs to the field of smart electric meters, in particular to a smart electric meter.

Background technique

The demand for energy in today's society is increasing, and non-renewable fossil energy is gradually being exhausted; while energy consumption is also producing a large amount of greenhouse gases, the environment is deteriorating year by year. Therefore, energy conservation, emission reduction, green energy and sustainable development have become important challenges for human energy development. It is under this severe situation that the smart grid is proposed.

Smart Grid (Smart Grid) is based on the physical grid, built on an integrated, high-speed two-way communication network, and integrates modern advanced sensing and measurement technology, communication technology, information technology, computer technology and control technology with the physical grid. The connotation of the new power grid formed is to realize the informatization, digitization, automation and interaction of the power grid. The main advantages of the smart grid are: strong, self-healing, compatible, interactive, safe, economical, clean, efficient, integrated, optimized, etc. The application of smart grid can effectively manage electric energy, distribute electric energy, coordinate peak and valley periods of electric energy, etc.

As a large energy consuming country, due to various reasons in the past, my country's overall energy utilization rate was low, and the transmission loss on the grid accounted for about 7% of the total electricity. The application of smart meters can first reduce losses. The traditional inductive meter has a power loss of about 2W, but the smart meter cancels most of the mechanical links of the inductive meter, which greatly reduces the power loss; secondly, the automatic meter reading system of the smart meter can save human resources to a certain extent; Or, the use of smart meters can effectively manage and distribute electric energy to a certain extent, especially in times of power shortage. In general, smart meters and smart interactive terminals are smart electronic devices applied to the user side, with power metering, remote control, two-way communication, remote meter reading, event alarm, power consumption information and parameter display, power quality monitoring, user A series of functions such as side distributed power monitoring, optimizing smart meters can not only better serve the people and enterprises; it is also an important step in my country's smart grid construction, making my country's smart grid more influential in the world .

Utility model content

Aiming at the above shortcomings, the utility model designs a smart meter with LPC1766 32-bit single-chip microcomputer as the core of the controller, and calculates the voltage and current sampling signals through the power metering module to obtain power consumption information such as active power, reactive power, electricity charges, etc. ;All electricity consumption information is stored in the storage module for users to query; the infrared communication interface sends the electricity consumption information to the meter reading personnel, which can improve work efficiency; through the RS485 communication interface, the electricity consumption information of residents and the electricity price information of the power supply company can be exchanged Two-way communication not only improves the work efficiency of the power supply company, reduces costs, but also guides users to use electricity reasonably to achieve the goal of energy saving.

The technical scheme that the utility model adopts is:

A smart meter, characterized in that it comprises:

Voltage and current sampling module, used to collect user voltage and current data;

EMI filter module, used to suppress harmonic pollution and accurately measure user power;

The button module provides related buttons for energy information query and electricity price information query;

System power-off detection/battery under-voltage detection module, used for reliable power supply for storage units in the case of grid power failure;

The energy metering module uses the ATT7022B energy metering chip to calculate the voltage and current sampling signals to obtain electricity consumption information such as active energy, reactive energy, etc.;

RS485 communication interface, used to transmit energy information and electricity price information between the energy meter and the host computer;

The display module is used to display digital information of electricity consumption, electricity price information, and user setting information;

The storage unit is used to store the user's electric energy information and the electricity price information sent by the upper computer;

The clock module is used to generate real-time time, so that users can reasonably arrange electricity consumption time and accurate measurement of electricity charges according to the principle of peak and valley electricity prices;

The infrared communication interface is used to facilitate the staff of the power supply company to quickly read the power consumption information at close range with the hand-held power reading device;

The alarm module enables the smart meter to have automatic alarm functions such as unexpected harsh environments and man-made damage;

The controller, according to the real-time clock signal and electricity price information, receives and processes the energy information sent by the energy metering module, calculates and stores the user's electricity fee, and is also used to control the display module and alarm module, and can send through the RS485 communication interface and infrared communication interface electricity usage information.

As one of the optimizations: It also includes a power supply module, which is used to supply power to each module in the smart meter.

As the second optimization: the controller adopts LPC1766 32-bit single-chip microcomputer.

As the third optimization: the display module adopts LCD12864 liquid crystal display, and is electrically connected with the controller.

As the fourth optimization: the storage unit adopts EEPROM anti-power-down data memory, and is electrically connected with the controller.

As the fifth optimization: it also includes a hand-held power reading device, which is used to quickly read power consumption information at close range.

Description of drawings

Fig. 1 shows a schematic structural view of a smart meter of the present invention;

In the figure: 1. Voltage and current sampling module, 2. EMI filter module, 3. Energy metering module, 4. Controller, 5. Button module, 6. System power-down detection/battery undervoltage detection module, 7. Power module, 8. RS485 communication interface, 9. Display module, 10. Storage unit, 11. Alarm module, 12. Clock module, 13. Infrared communication interface, 14. Host computer, 15. Handheld power reading device.

Detailed ways

The utility model is described in detail below in conjunction with specific embodiments.

The following examples will help those skilled in the art to further understand the utility model, but do not limit the utility model in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present utility model. These all belong to the protection domain of the present utility model.

Example 1:

As shown in Figure 1, a smart meter includes:

The voltage and current sampling module 1 is used to collect user voltage and current data, and convert the analog information of electricity consumption in the meter into digital information of electricity consumption. The voltage and current sampling module 1 is electrically connected to the EMI filter module 2 . The EMI filter module is used to suppress harmonic pollution and accurately measure user power. The power consumption information filtered by the EMI filter module 2 is sent to the power metering module 3. The sampled voltage and current are used to calculate the electric energy, and the electric energy is calculated. The accuracy level of the electric energy metering module 3 is: active energy level 0.2; reactive energy level 1.0. The electricity consumption information obtained by the electric energy metering module 3 is processed by the controller 4, and the electric energy, unit price, and total electric energy consumption price are transmitted to the upper computer 14 through the RS485 communication interface 8 on the one hand, and the upper computer 14 passes The real-time monitoring screen displays the operating status of the smart meter in real time. At the same time, the upper computer 14 can also send a series of control commands to the controller 4 through the RS485 communication interface 8. For example, if the smart meter is working in an abnormal state, the upper computer 14 can A command is sent to the controller 4, and the meter returns to the normal state through the calibration device; on the other hand, it is displayed through the display module 9, and the display module 9 adopts an LCD12864 liquid crystal display. The controller 4 uses a 32-bit high-performance single-chip microcomputer LPC1766 as the core controller, and cooperates with peripheral circuits to realize the multi-function and high reliability of the electric energy meter. Using the infrared communication interface 13 to send and receive signals, the electric energy displayed on the meter is automatically transcribed, and the transcriber can quickly read the electricity consumption information at close range through the hand-held electric energy reading device 15, which is convenient, efficient, and accurate, and saves a lot of human resources; the alarm module 11 It is electrically connected with the controller 4, so that the smart meter has automatic alarm functions such as sudden encounter with harsh environments and man-made sabotage. For example, when a fire is detected by infrared, an alarm signal is sent through the controller 4, and the alarm module 11 is driven to alarm. At the same time, through the RS485 communication interface 8. Send the alarm information to the upper computer 14, and inform the electric power department to take measures. At the same time, in order to further strengthen the safety of the ammeter, a system power-off detection/battery under-voltage detection module 6 is also designed to provide reliable power supply for the storage unit in the case of power-off of the power grid, so as to ensure reliable sampling of voltage and current, and has a self-test function. It can actively provide corresponding alarm signal output to the upper computer 14, such as TV (PT) loss of voltage, TA (CT) disconnection, abnormal power supply, self-test failure, etc. The storage unit 10 is electrically connected with the controller 4, and the storage unit 10 adopts EEPROM power-down prevention data memory, which is more convenient for data storage, and the data is not lost when the electric meter is powered off, and the data is still maintained after power-on again. The clock module 12 is electrically connected with the controller 4, and the high-precision clock circuit generates real-time time, so that the user can reasonably arrange the electricity consumption time and the accurate measurement of electricity charges according to the principle of peak and valley electricity prices; the button module 5 provides relevant buttons for querying electric energy information and electricity price information , the good human-computer interaction interface design makes the query and setting operation of the meter more convenient and concise; the power module 7 transforms and stabilizes the 220v single-phase AC power to supply power to each module in the meter, and the overall structure of the circuit is optimized to make the system Its own power consumption is minimal.

Claims (6)

1. A kind of smart meter, is characterized in that, comprises: Voltage and current sampling module, used to collect user voltage and current data; EMI filter module, used to suppress harmonic pollution and accurately measure user power; The button module provides related buttons for energy information query and electricity price information query; System power-off detection/battery under-voltage detection module, used for reliable power supply for storage units in the case of grid power failure; The energy metering module uses the ATT7022B energy metering chip to calculate the voltage and current sampling signals to obtain electricity consumption information such as active energy, reactive energy, etc.; RS485 communication interface, used to transmit energy information and electricity price information between the energy meter and the host computer; The display module is used to display digital information of electricity consumption, electricity price information, and user setting information; The storage unit is used to store the user's electric energy information and the electricity price information sent by the upper computer; The clock module is used to generate real-time time, so that users can reasonably arrange electricity consumption time and accurate measurement of electricity charges according to the principle of peak and valley electricity prices; The infrared communication interface is used to facilitate the staff of the power supply company to quickly read the power consumption information at close range with the hand-held power reading device; The alarm module enables the smart meter to have automatic alarm functions such as unexpected harsh environments and man-made damage; The controller, according to the real-time clock signal and electricity price information, receives and processes the energy information sent by the energy metering module, calculates and stores the user's electricity fee, and is also used to control the display module and alarm module, and can send through the RS485 communication interface and infrared communication interface electricity usage information. 2. A kind of smart meter according to claim 1, characterized in that: it also includes a power supply module, which is used to supply power to each module in the smart meter. 3. A kind of intelligent electric meter according to claim 1, is characterized in that: described controller adopts LPC1766 32 single-chip microcomputers. 4. A smart meter according to claim 1, characterized in that: the display module adopts an LCD12864 liquid crystal display and is electrically connected to the controller. 5 . The smart meter according to claim 1 , wherein the storage unit is an EEPROM anti-power-off data memory, and is electrically connected to the controller. 6. The smart meter according to claim 1, further comprising a hand-held power reading device for quickly reading power consumption information at a short distance.