An electrical energy metering apparatus
Patent Information
- Application Number
- CN202521212990.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-13
- Publication Date
- 2026-10-09
- Estimated Expiration
- 2035-06-13
AI Technical Summary
[0002]目前电能测量用计量仪表存在以下缺陷：1、计量方案上选用计量芯片+MCU配合，通过计量芯片搭配外围计量电路采集相关参数，通过计量芯片和MCU之间的通讯将相关参数数据传输给MCU并存储到相关存储芯片中，传输速率较慢
[0014]本实用新型的优点和有益效果在于：电能计量仪表的安装结构采用导轨式安装和嵌入式安装兼容的方式，能更好的适应不同现场的安装环境；通过电流互感器转换电流信号然后通过电流采集电路进行采样，通过电压采集电路采样电压信号，使得计量芯片可以通过比较电压信号和电流信号的相位差判断电能流动方向，实现双向计量。另外，选用电参量数据的传输时间小于100ms的计量芯片RN7302，解决电参量数据传输速率较慢的问题。
Smart Images
Figure CN224840337U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of electrical energy measurement technology, and specifically to an electrical energy metering instrument. Background Technology
[0002] Currently, metering instruments for electrical energy measurement have the following drawbacks: 1. The metering scheme uses a combination of a metering chip and an MCU. Relevant parameters are collected through the metering chip and external metering circuits. The data is transmitted to the MCU and stored in a relevant memory chip via communication between the metering chip and the MCU, resulting in a slow transmission rate. 2. Due to the specific needs of the electrical measurement industry, bidirectional metering of electrical energy is required. Conventional metering instruments typically only perform forward active energy metering and cannot achieve bidirectional metering. 3. Traditional metering instruments are limited by their installation environment, requiring either DIN rail mounting or embedded mounting, making it impossible to achieve compatibility between the two installation methods. Utility Model Content
[0003] The purpose of this utility model is to overcome the defects in the existing technology and provide an energy metering instrument that is compatible with both rail mounting and embedded mounting.
[0004] To achieve the above objectives, the technical solution of this utility model is to design an electrical energy meter, comprising: a housing assembly, a circuit module assembly, and an installation adapter assembly; The housing assembly includes a middle housing and a lower housing; the mounting adapter assembly includes a rail mounting component and an embedded mounting component; and the circuit module assembly includes a display circuit board, a power circuit board, and a signal circuit board. The middle housing and the lower housing are connected by a snap-fit structure to form a cavity, which is used to assemble the circuit module assembly. The guide rail mounting component or the embedded mounting component can be assembled on the top of the middle housing. The guide rail mounting component is used for guide rail mounting, and the embedded mounting component is used for embedded mounting. The power circuit board is provided with a power supply unit and a communication unit, and the signal circuit board is provided with a CPU unit, a metering unit and a storage unit. The power supply unit is electrically connected to the communication unit, the CPU unit, the metering unit, the storage unit and the display circuit board respectively, and the CPU unit is electrically connected to the communication unit, the metering unit, the storage unit and the display circuit board respectively.
[0005] Furthermore, the guide rail mounting component includes a guide rail mounting housing and a guide rail mounting locking component. The guide rail mounting housing can cover and clamp the top of the middle housing and is locked and fixed by the guide rail mounting locking component.
[0006] Furthermore, the embedded mounting component includes an embedded mounting assembly, an embedded bracket, an embedded waterproof perforated gasket, and an embedded mounting surface adhesive. The embedded mounting assembly can cover and clamp the top of the middle housing and is fixed by the embedded mounting surface adhesive. The embedded bracket and the embedded waterproof perforated gasket are used to cooperate with the embedded mounting assembly for embedded installation.
[0007] Furthermore, the housing assembly also includes a module housing, the circuit module assembly also includes a module circuit board, and the mounting adapter assembly also includes a first side panel, a second side panel, and a plug; The module housing is used to assemble the module circuit board. The module housing is provided with an expansion function interface. The plug is used to seal the expansion function interface. The module housing can be spliced to the bottom of the lower housing and fixed by attaching a first and a second adhesive to both sides of the module housing. The module circuit board is provided with connection interfaces that are electrically connected to the display circuit board, power circuit board and signal circuit board respectively, and the module circuit board is used to install expansion function modules.
[0008] Furthermore, the CPU unit is model GD32F425RET6.
[0009] Furthermore, the display circuit board is provided with a display unit and a button unit. The display unit is a dot matrix LCD screen, and the dot matrix LCD screen communicates with the CPU unit through a parallel interface.
[0010] Furthermore, the storage unit includes a storage chip and peripheral circuitry. The storage chip is connected to the CPU unit through the peripheral circuitry, and the CPU unit reads and stores data with the storage chip through the peripheral circuitry. The storage chip is model MB85RC64.
[0011] Furthermore, the communication unit is a three-optical-coupled isolated communication unit, including an optical coupler and a communication chip, wherein the optical coupler is model LTV-816S and the communication chip is model BL3085.
[0012] Furthermore, the metering unit includes a metering chip, a voltage acquisition circuit, a current acquisition circuit, a pulse output circuit, and a current transformer; The metering chip is electrically connected to the voltage acquisition circuit, the current acquisition circuit, and the pulse output circuit, respectively, and the current transformer is electrically connected to the current acquisition circuit. The voltage acquisition circuit is used to sample the voltage signal of the circuit under test and transmit it to the metering chip. The current transformer is used to convert the current in the circuit under test and transmit it to the current acquisition circuit for sampling. The current acquisition circuit is used to transmit the sampled current signal to the metering chip. The pulse output circuit is used to output an active pulse to check the energy accuracy level. The metering chip is used to convert the sampled voltage signal and current data into electrical parameter data and record the electrical parameter data.
[0013] Furthermore, the metering chip is model RN7302.
[0014] The advantages and beneficial effects of this utility model are as follows: The installation structure of the power meter adopts a compatible method of DIN rail mounting and embedded mounting, which can better adapt to different on-site installation environments; the current signal is converted by a current transformer and then sampled by a current acquisition circuit, and the voltage signal is sampled by a voltage acquisition circuit, so that the metering chip can determine the direction of power flow by comparing the phase difference between the voltage signal and the current signal, thus realizing bidirectional metering. In addition, the RN7302 metering chip with a transmission time of less than 100ms is selected to solve the problem of slow power parameter data transmission rate. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the structure of the electrical energy metering instrument of this utility model; Figure 2 This is a modular architecture diagram of the electrical energy metering instrument of this utility model.
[0016] In the diagram: 1-1, Guide rail mounting housing; 1-2, Embedded mounting assembly; 2-1, Guide rail mounting locking element; 2-2, Embedded mounting bracket; 3, Embedded mounting faceplate; 4, Display circuit board; 5, Power circuit board; 6, Signal circuit board; 7, Middle housing; 8-1, Embedded waterproof opening 88*88 gasket; 8-2, Embedded waterproof opening 92*92 gasket; 9, Lower housing; 10, Plug; 11, Module circuit board; 12, Module housing; 13, First faceplate; 14, Second faceplate; 6.2, CPU unit; 5.1, Power supply unit; 4.1, Display unit; 6.3, Storage unit; 4.2, Button unit; 5.3, Communication unit; 6.1, Metering unit. Detailed Implementation
[0017] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.
[0018] according to Figures 1-2As shown, this utility model is an electrical energy meter, including: a housing assembly, a circuit module assembly, and a mounting adapter assembly; the housing assembly includes a middle housing 7 and a lower housing 9, the mounting adapter assembly includes a guide rail mounting component and an embedded mounting component, and the circuit module assembly includes a display circuit board 4, a power circuit board 5, and a signal circuit board 6; The middle housing 7 and the lower housing 9 are connected by a snap-fit structure to form a cavity. The cavity is used to assemble circuit module components. The guide rail mounting component or the embedded mounting component can be assembled on the top of the middle housing 7. The guide rail mounting component is used for guide rail mounting, and the embedded mounting component is used for embedded mounting. The power circuit board 5 is equipped with a power supply unit 5.1 and a communication unit 5.3. The signal circuit board 6 is equipped with a CPU unit 6.2, a metering unit 6.1 and a storage unit 6.3. The power supply unit 5.1 is electrically connected to the communication unit 5.3, the CPU unit 6.2, the metering unit 6.1, the storage unit 6.3 and the display circuit board 4 respectively. The CPU unit 6.2 is electrically connected to the communication unit 5.3, the metering unit 6.1, the storage unit 6.3 and the display circuit board 4 respectively.
[0019] The bottom surface of the middle housing 7 and the lower housing 9 are connected by a snap-fit structure to form the outer shell. The top can be fitted with two types of mounting accessories: guide rail mounting parts and guide rail mounting parts. Three circuit boards 4, 5, and 6 are installed inside the outer shell.
[0020] When the electricity meter is in operation, it draws power from the power grid by connecting its power port to the grid. The power from the external grid is directly input to the power supply unit, which converts it into a small voltage signal to power the communication unit and other units. The power supply unit is a switching power supply with two isolated outputs: one for the communication unit and the other for the other units.
[0021] The display circuit board 4 is equipped with a display unit 4.1 and a button unit 4.2, which are electrically connected to the power supply unit and the CPU unit, respectively.
[0022] When the electricity meter is working, the voltage acquisition circuit of the metering unit samples the voltage data and inputs it into the metering unit. The current signal passes through the built-in current transformer, converting the large current into a small current, and then passes through the current sampling circuit, inputting the sampled current data into the metering unit. The display unit on the display circuit board can display relevant power parameters. The button unit is directly connected to the CPU unit. Through the button unit, instructions can be input to the CPU unit to control the display unit to display information in rotation. The communication unit can establish communication with external devices and exchange data. The storage unit is used to store relevant data.
[0023] To facilitate guide rail installation, the preferred embodiment of this utility model is that the guide rail mounting component includes a guide rail mounting housing 1-1 and a guide rail mounting locking component 2-1. The guide rail mounting housing 1-1 can cover and clamp the top of the middle housing 7 and is locked and fixed by the guide rail mounting locking component 2-1.
[0024] When performing rail mounting, the power circuit board 5 and signal circuit board 6 are placed inside the middle housing 7. Then, the display circuit board 4 is installed into the middle housing 7 from the front. The rail mounting housing 1-1 is then covered and secured. The upper and lower housings 9 are then covered. Finally, the locking piece 2-1 is inserted into the rail mounting housing 1-1 to complete the main assembly.
[0025] To facilitate embedded installation, a preferred embodiment of this utility model is that the embedded mounting component includes an embedded mounting assembly 1-2, an embedded bracket 2-2, an embedded waterproof perforated gasket, and an embedded mounting surface 3. The embedded mounting assembly 1-2 can cover and clamp the top of the middle housing 7 and is fixed by the embedded mounting surface 3. The embedded bracket 2-2 and the embedded waterproof perforated gasket are used to cooperate with the embedded mounting assembly for embedded installation.
[0026] Embedded waterproof perforated gaskets include embedded waterproof perforated 88*88 gasket 8-1 and embedded waterproof perforated 92*92 gasket 8-2.
[0027] During embedded installation, the power circuit board 5 and signal circuit board 6 are placed inside the middle housing 7. Then, the display circuit board 4 is installed into the middle housing 7 from the front. The embedded mounting assembly 1-2 is then placed on top and secured. The upper and lower housings 9 are then closed, and the embedded mounting surface sticker 3 is attached to the top of the embedded mounting assembly 1-2, completing the main assembly. The embedded waterproof opening gasket 88*88 and embedded waterproof opening gasket 92*92 are selected according to the size of the embedded installation opening on site. The embedded mounting bracket 2-2 is installed on site.
[0028] To facilitate the functional expansion of the electricity metering instrument, a preferred embodiment of this utility model is that the housing assembly further includes a module housing 12, the circuit module assembly further includes a module circuit board 11, and the mounting adapter assembly further includes a first adhesive strip 13, a second adhesive strip 14, and a plug 10; the module housing 12 is used to assemble the module circuit board 11, the module housing 12 is provided with an expansion function interface, the plug 10 is used to seal the expansion function interface, the module housing 12 can be spliced to the bottom of the lower housing 9, and fixed by the first adhesive strip 13 and the second adhesive strip 14 attached to both sides of the module housing 12; the module circuit board 11 is provided with connection interfaces that are electrically connected to the display circuit board 4, the power circuit board 5, and the signal circuit board 6 respectively, and the module circuit board 11 is used to install the expansion function module.
[0029] After the main body assembly is completed, if an expandable module needs to be assembled, the module circuit board 11 is installed into the module housing 12, the first side sticker 13 and the second side sticker 14 are attached to the side panel areas of the module housing 12 to complete the expansion module assembly, and finally the module is spliced onto the main body, and the plug 10 is inserted into the corresponding position of the module housing 12 to block the expansion function interface.
[0030] The modular circuit board allows for hardware expansion, supporting external sensors (such as gas concentration sensors and vibration monitoring modules) or actuators (such as relay output modules), thus breaking through the physical boundaries of basic functions. It is protocol compatible, supporting different industrial protocols through reserved interfaces (such as CAN bus and Ethernet PHY chips) to adapt to the needs of different scenarios. It can enhance the instrument's computing power, for example, by integrating edge computing chips to process local tasks and reduce reliance on the cloud.
[0031] To make data processing more efficient, the preferred embodiment of this utility model is that the CPU unit is model GD32F425RET6.
[0032] The CPU unit 6.2 is connected to the other units. Its chip model is GD32F425RET6, which is a 32-bit controller based on the ARM core, used for control and signal processing. The CPU unit communicates with the metering unit through USART, and exchanges and processes the current and voltage signal data collected by the metering unit with the CPU unit.
[0033] To reduce power consumption and cost, the preferred embodiment of this utility model is that the display circuit board 4 is provided with a display unit 4.1 and a button unit 4.2. The display unit 4.1 is a dot matrix LCD screen, which communicates with the CPU unit 6.2 through a parallel interface.
[0034] Display unit 4.1 is a dot-matrix LCD screen that communicates with CPU unit 6.2 via a parallel interface. Its anti-static capability reaches 12KV, and with the addition of a surface-mount panel, the product's anti-static capability far exceeds industry requirements. The advantages of dot-matrix LCDs lie in their low power consumption and low cost, making them suitable for scenarios requiring high-information, dynamic, and long-lasting displays.
[0035] The button unit 4.2 is a touch button. By pressing the button, commands can be sent to the CPU unit to control the screen display information.
[0036] To improve the performance of the storage unit, a preferred embodiment of this utility model is that the storage unit includes a storage chip and peripheral circuits. The storage chip is connected to the CPU unit through the peripheral circuits, and the CPU unit reads and stores data with the storage chip through the peripheral circuits. The storage chip is model MB85RC64.
[0037] The memory chip, paired with peripheral circuitry, enables the CPU chip to read and store data. The selected memory chip is the MB85RC64, and the communication method is I2C. Its advantages include high-speed read and write, ultra-long erase and write life, low power consumption, and non-volatility. Combined with the convenience of the I2C interface, it is suitable for scenarios such as power meters that require frequent data updates, high-reliability storage, and low-power operation.
[0038] To achieve both electrical isolation and interference-resistant transmission, and to adapt to high-altitude environments, the preferred embodiment of this utility model is that the communication unit 5.3 is a three-optical-coupled isolated communication unit, including an optical coupler and a communication chip, wherein the optical coupler is of model LTV-816S and the communication chip is of model BL3085.
[0039] The communication unit 5.3 adopts a three-optical-coupler isolation communication scheme. The optical coupler used is model LTV-816S. The optical coupler solves the problem of high-altitude insulation and anti-interference and can meet the high-altitude isolation requirements. The communication chip is model BL3085, which is widely used in industrial products and is more practical and reliable.
[0040] To achieve bidirectional metering, high-precision metering, and wide-range adaptability, the preferred embodiment of this utility model is that the metering unit 6.1 includes a metering chip, a voltage acquisition circuit, a current acquisition circuit, a pulse output circuit, and a current transformer; the metering chip is electrically connected to the voltage acquisition circuit, the current acquisition circuit, and the pulse output circuit respectively, and the current transformer is electrically connected to the current acquisition circuit; the voltage acquisition circuit is used to sample the voltage signal of the circuit under test and transmit it to the metering chip; the current transformer is used to convert the current in the circuit under test and transmit it to the current acquisition circuit for sampling; the current acquisition circuit is used to transmit the sampled current signal to the metering chip; the pulse output circuit is used to output an active pulse to verify the energy accuracy level; and the metering chip is used to convert the sampled voltage signal and current data into electrical parameter data and record the electrical parameter data.
[0041] The metering chip selected is the RN7302, which can record rapid changes in electrical parameters with a response time of less than 100ms. The voltage acquisition circuit converts the voltage directly connected to the grid into a small signal via resistive voltage division before inputting it to the metering chip. An internal current transformer converts a large current into a small current, which is then sampled and input to the metering chip. The metering chip can determine the direction of energy flow by comparing the phase difference between the voltage and current signals, achieving bidirectional metering. The pulse output circuit outputs active pulses to verify the accuracy level of the electrical energy. The isolation scheme uses an LTV-816 optocoupler for more stable isolation.
[0042] To achieve a rapid dynamic response, the preferred embodiment of this utility model is that the metering chip 6.1 is model RN7302.
[0043] The metering chip with model number RN7302 can record rapid changes in electrical parameters, and its response time is much less than 100ms, which can achieve the effect of less than 100ms transmission time of electrical parameter data of the metering chip.
[0044] All the components selected above meet the requirements for operation over a wide temperature range and are suitable for harsh environments such as high-altitude locations.
[0045] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.
Claims
1. An electrical energy meter, characterized in that, Includes: housing assembly, circuit module assembly, and mounting adapter assembly; The housing assembly includes a middle housing and a lower housing; the mounting adapter assembly includes a rail mounting component and an embedded mounting component; and the circuit module assembly includes a display circuit board, a power circuit board, and a signal circuit board. The middle housing and the lower housing are connected by a snap-fit structure to form a cavity, which is used to assemble the circuit module assembly. The guide rail mounting component or the embedded mounting component can be assembled on the top of the middle housing. The guide rail mounting component is used for guide rail mounting, and the embedded mounting component is used for embedded mounting. The power circuit board is provided with a power supply unit and a communication unit, and the signal circuit board is provided with a CPU unit, a metering unit and a storage unit. The power supply unit is electrically connected to the communication unit, the CPU unit, the metering unit, the storage unit and the display circuit board respectively, and the CPU unit is electrically connected to the communication unit, the metering unit, the storage unit and the display circuit board respectively.
2. The electricity metering instrument according to claim 1, characterized in that, The guide rail mounting component includes a guide rail mounting housing and a guide rail mounting locking component. The guide rail mounting housing can cover and clamp the top of the middle housing and is locked and fixed by the guide rail mounting locking component.
3. The electricity metering instrument according to claim 1, characterized in that, The embedded mounting component includes an embedded mounting assembly, an embedded bracket, an embedded waterproof perforated gasket, and an embedded mounting surface adhesive. The embedded mounting assembly can cover and clamp the top of the middle housing and is fixed by the embedded mounting surface adhesive. The embedded bracket and the embedded waterproof perforated gasket are used to cooperate with the embedded mounting assembly for embedded installation.
4. The electricity metering instrument according to claim 1, characterized in that, The housing assembly further includes a module housing, the circuit module assembly further includes a module circuit board, and the mounting adapter assembly further includes a first side panel, a second side panel, and a plug; The module housing is used to assemble the module circuit board. The module housing is provided with an expansion function interface. The plug is used to seal the expansion function interface. The module housing can be spliced to the bottom of the lower housing and fixed by attaching a first and a second adhesive to both sides of the module housing. The module circuit board is provided with connection interfaces that are electrically connected to the display circuit board, power circuit board and signal circuit board respectively, and the module circuit board is used to install expansion function modules.
5. The electricity metering instrument according to claim 1, characterized in that, The CPU unit is model GD32F425RET6.
6. The electricity metering instrument according to claim 1, characterized in that, The display circuit board is equipped with a display unit and a button unit. The display unit is a dot matrix LCD screen, which communicates with the CPU unit through a parallel interface.
7. The electricity metering instrument according to claim 1, characterized in that, The storage unit includes a storage chip and peripheral circuits. The storage chip is connected to the CPU unit through the peripheral circuits. The CPU unit reads and stores data with the storage chip through the peripheral circuits. The storage chip is model MB85RC64.
8. The electricity metering instrument according to claim 1, characterized in that, The communication unit is a three-optical-coupled isolated communication unit, including an optical coupler and a communication chip. The optical coupler is model LTV-816S and the communication chip is model BL3085.
9. The electricity metering instrument according to claim 1, characterized in that, The metering unit includes a metering chip, a voltage acquisition circuit, a current acquisition circuit, a pulse output circuit, and a current transformer. The metering chip is electrically connected to the voltage acquisition circuit, the current acquisition circuit, and the pulse output circuit, respectively, and the current transformer is electrically connected to the current acquisition circuit. The voltage acquisition circuit is used to sample the voltage signal of the circuit under test and transmit it to the metering chip. The current transformer is used to convert the current in the circuit under test and transmit it to the current acquisition circuit for sampling. The current acquisition circuit is used to transmit the sampled current signal to the metering chip. The pulse output circuit is used to output an active pulse to check the energy accuracy level. The metering chip is used to convert the sampled voltage signal and current data into electrical parameter data and record the electrical parameter data.
10. The electricity metering instrument according to claim 9, characterized in that, The metering chip is model RN7302.