A digital display meter based on electric energy metering and measuring power grid quality

Abstract

The utility model provides a kind of digital display table based on electric energy measurement and measurement power grid quality, it solves the problems such as poor electric energy meter monitoring communication stability, it includes main control MCU module IC2, current voltage sampling and measurement module are connected to main control MCU module IC2, main control MCU module IC2 is connected with relay output and pulse output module, main control MCU module IC2 is equipped with Y-BUS communication module and RS485 communication module, main control MCU module IC2 is equipped with remote signaling input module, button and storage module and power module.The utility model has the advantages of good monitoring communication stability, rich function etc..

Description

Technical Field

[0001] This utility model belongs to the field of power metering technology, specifically relating to a digital display meter based on power metering and measuring power grid quality. Background Technology

[0002] Electricity meters are core devices in power systems for measuring electrical energy consumption. They convert electrical energy signals into measurable physical quantities, ultimately calculating the consumed energy through cumulative calculations. Voltage and current transformers collect voltage and current signals from the circuit, converting them into small-range analog electrical signals. These sampled analog signals are then converted into digital signals by an A / D converter and sent to a microprocessor for calculation. The microprocessor calculates instantaneous power using algorithms, integrates it over time to obtain the electrical energy, and finally displays the result through a mechanical counter or electronic display. However, in practical use, existing electricity meters suffer from poor communication stability and inaccurate monitoring of critical power grid circuit conditions, affecting the final accuracy of electricity measurement.

[0003] To address the shortcomings of existing technologies, people have conducted long-term explorations and proposed various solutions. For example, Chinese patent literature discloses an energy meter data communication display device [200810209780.5], which consists of a communication module, a central data processing unit, a security authentication module, a display unit, a keyboard input unit, and a coupling transformer. The energy meter data communication display device establishes a communication connection with the energy meter by plugging its power plug into any power outlet of the user, and can then read and sequentially display data such as active energy, current, tariff status, and remaining power of the corresponding energy meter.

[0004] The above solution has solved the problem of electricity metering and display to some extent, but it still has many shortcomings, such as poor stability of monitoring communication. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a reasonably designed digital display meter that monitors communication stability and measures power grid quality based on electricity metering.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a digital display meter based on power metering and measuring power grid quality, comprising a main control MCU module IC2, the main control MCU module IC2 being connected to a current and voltage sampling and metering module, the main control MCU module IC2 being connected to a relay output and pulse output module, the main control MCU module IC2 being equipped with a Y-BUS communication module and an RS485 communication module, the main control MCU module IC2 being equipped with a remote signaling input module, a button and storage module, and a power supply module.

[0007] In the aforementioned digital display meter based on electricity metering and power grid quality measurement, the main control MCU module IC2 is connected to interface J1, and the main control MCU module IC2 is equipped with a reference voltage circuit consisting of transistor Q2 and light-emitting diode LCD1.

[0008] In the aforementioned digital display meter based on electricity metering and power grid quality measurement, the current and voltage sampling and metering module includes a metering chip IC1, which is equipped with an interface JP1 and connected to several sampling circuits.

[0009] In the aforementioned digital display meter based on electricity metering and power grid quality measurement, the main control MCU module IC2 communicates with the metering chip IC1 via SPI.

[0010] In the aforementioned digital display meter based on electricity metering and power grid quality measurement, the relay output and pulse output module includes transistors Q5 and Q6, as well as relays RELAY1 and RELAY2. The relay output and pulse output module has an optocoupler U3, and the optocoupler U3 is connected to transistor Q3.

[0011] In the aforementioned digital display meter based on electricity metering and power grid quality measurement, the Y-BUS communication module includes a dual-channel MOSFET gate driver IC7, which is connected to operational amplifiers IC13 and IC15, and operational amplifier IC15 is connected to transistors Q12 and Q13.

[0012] In the aforementioned digital display meter based on electricity metering and power grid quality measurement, the remote signaling input module includes clamping units Z2 and Z3. Clamping unit Z2 is connected to adjustable resistors RT4 and RT5, and clamping unit Z3 is connected to adjustable resistors RT6 and RT7.

[0013] In the aforementioned digital display meter based on electricity metering and power grid quality measurement, the buttons and storage module have a storage chip IC14 and a conversion chip IC11, and the buttons and storage module have switches SW1-SW4.

[0014] In the aforementioned digital display meter based on electricity metering and power grid quality measurement, the RS485 communication module includes a communication chip IC3 and a clamping unit Z1.

[0015] In the aforementioned digital display meter based on electricity metering and power grid quality measurement, the power module includes a power chip IC5 and the power chip IC5 is connected to a transformer B1. The power chip IC5 is connected to a bridge rectifier BRIDGE1 through an inductor L1. The power module also has a voltage regulator chip IC4.

[0016] Compared with existing technologies, the advantages of this invention are as follows: the relay output provides remote control capability, and the configurable remote signaling input can monitor various external status signals, thereby ensuring the stability of power grid monitoring communication; a dedicated metering chip is used to handle core power calculation, and communication with the MCU via SPI ensures metering accuracy and real-time performance; the combination of the Y-BUS communication module and the RS485 communication module ensures compatibility and interoperability with mainstream monitoring systems, while meeting the needs of specific application scenarios and enhancing communication reliability and anti-interference capabilities. Attached Figure Description

[0017] Figure 1 This is a circuit diagram of the main control MCU module of this utility model;

[0018] Figure 2 This is a circuit diagram of the current and voltage sampling and metering module of this utility model;

[0019] Figure 3 This is a circuit diagram of the relay output and pulse output module of this utility model;

[0020] Figure 4 This is a circuit diagram of the Y-BUS communication module of this utility model;

[0021] Figure 5 This is a circuit diagram of the remote signaling input module of this utility model;

[0022] Figure 6 This is a circuit diagram of the button and storage module of this utility model;

[0023] Figure 7 This is a circuit diagram of the RS485 communication module of this utility model;

[0024] Figure 8 This is a circuit diagram of the power module of this utility model. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0026] like Figure 1-8As shown, a digital display meter based on electricity metering and grid quality measurement includes a main control MCU module IC2, designed based on an ARM Cortex-M0 core, integrating up to 512KB of embedded flash memory and up to 80KB of SRAM for low power consumption and high precision multi-functional metering chip design. The main control MCU module IC2 is connected to a high-precision current and voltage sampling and metering module, and simultaneously drives relay output and pulse output modules to achieve load control and electricity pulse metering. To meet industrial communication requirements, the main control MCU module IC2 integrates a Y-BUS communication module and an RS485 communication module, and is equipped with a remote signaling input module for status monitoring, a button and storage module supporting local parameter configuration, and a high-reliability power supply module.

[0027] Specifically, the main control MCU module IC2 expands peripherals through interface J1. Its internal reference source is provided by a reference voltage circuit composed of transistor Q2 and light-emitting diode LCD1, which outputs a stable reference voltage.

[0028] In detail, the current and voltage sampling and metering module uses a dedicated metering chip IC1, which connects to an external CT / PT sensor via interface JP1. Its sampling circuit includes voltage sampling, current sampling, and signal conditioning circuits.

[0029] Furthermore, the main control MCU module IC2 and the metering chip IC1 communicate via high-speed SPI to transmit parameters such as voltage / current RMS values, active / reactive power, power factor, and harmonic distortion rate in real time.

[0030] Furthermore, the relay output and pulse output module includes a driver stage consisting of transistors Q5 and Q6 and relays RELAY1 and RELAY2. The relay output and pulse output module has an optocoupler U3, and the optocoupler U3 is connected to transistor Q3 to form a pulse output layer. The relay coil is connected in parallel with a freewheeling diode.

[0031] In addition, the Y-BUS communication module includes a dual-channel MOSFET gate driver IC7 to build a half-duplex bus. The dual-channel MOSFET gate driver IC7 is connected to a comparator formed by operational amplifiers IC13 and IC15 for shaping. The operational amplifier IC15 is connected to transistors Q12 and Q13 for push-pull output to ensure reliable communication via cable.

[0032] Meanwhile, the remote signaling input module includes clamping units Z2 and Z3 for high-voltage clamping. Clamping unit Z2 is connected to adjustable resistors RT4 and RT5, and clamping unit Z3 is connected to adjustable resistors RT6 and RT7 to set the input threshold.

[0033] As can be seen, the button and storage module supports local information query and setting. It has a storage chip IC14 to store metering data and a conversion chip IC11 to expand 4-way buttons. The button and storage module has switches SW1-SW4 for parameter setting.

[0034] Clearly, the RS485 communication module reads and sets the data and parameters of this table. The communication chip IC3 and clamping unit Z1 provide ESD protection and support automatic matching of terminating resistors.

[0035] Preferably, the power module adopts a three-stage conversion architecture, specifically including a power chip IC5 and a transformer B1 connected to the power chip IC5 to achieve AC-DC isolation conversion. The power chip IC5 is connected to a bridge rectifier BRIDGE1 through an inductor L1 for filtering. The power module has a voltage regulator chip IC4 to provide stable digital power. It is powered by a lithium battery to maintain the RTC during power outages.

[0036] In summary, the principle of this embodiment is as follows: the main control MCU module IC2 obtains the current and voltage sampling signals processed by the metering chip IC1 through the SPI bus, and after power quality analysis, drives the relay output module to perform load control and triggers the pulse output module to generate metering pulses. At the same time, the communication protocol is encapsulated through the Y-BUS module and RS485 module, and data interaction is realized in conjunction with the remote signaling input module and the button storage module. Finally, the power supply module provides multi-stage regulated energy supply.

[0037] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0038] Although this document frequently uses terms such as current and voltage sampling and metering module, relay output and pulse output module, remote signaling input module, button and storage module, and power supply module, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A digital display meter based on electricity metering and power grid quality measurement, comprising a main control MCU module IC2, wherein the main control MCU module IC2 is connected to a current and voltage sampling and metering module, characterized in that, The main control MCU module IC2 is connected to a relay output and a pulse output module. The main control MCU module IC2 is equipped with a Y-BUS communication module and an RS485 communication module. The main control MCU module IC2 is also equipped with a remote signaling input module, a button and storage module, and a power supply module.

2. A digital display meter for measuring electricity and power grid quality according to claim 1, characterized in that, The main control MCU module IC2 is connected to interface J1, and the main control MCU module IC2 is equipped with a reference voltage circuit consisting of transistor Q2 and light-emitting diode LCD1.

3. A digital display meter for measuring electricity and grid quality according to claim 1, characterized in that, The current and voltage sampling and metering module includes a metering chip IC1, which is equipped with an interface JP1 and connected to several sampling circuits.

4. A digital display meter for measuring electricity and power grid quality according to claim 1, characterized in that, The main control MCU module IC2 communicates with the metering chip IC1 via SPI.

5. A digital display meter for measuring electricity and grid quality according to claim 1, characterized in that, The relay output and pulse output module includes transistors Q5 and Q6, and relays RELAY1 and RELAY2. The relay output and pulse output module has an optocoupler U3 and the optocoupler U3 is connected to transistor Q3.

6. A digital display meter for measuring electricity energy and power grid quality according to claim 1, characterized in that, The Y-BUS communication module includes a dual-channel MOSFET gate driver IC7, which is connected to operational amplifiers IC13 and IC15. The operational amplifier IC15 is connected to transistors Q12 and Q13.

7. A digital display meter for measuring electricity and power grid quality according to claim 1, characterized in that, The remote signaling input module includes clamping units Z2 and Z3. The clamping unit Z2 is connected to adjustable resistors RT4 and RT5, and the clamping unit Z3 is connected to adjustable resistors RT6 and RT7.

8. A digital display meter for measuring electricity energy and power grid quality according to claim 1, characterized in that, The button and storage module have a storage chip IC14 and a conversion chip IC11, and the button and storage module have switches SW1-SW4.

9. A digital display meter for measuring electricity energy and power grid quality according to claim 1, characterized in that, The RS485 communication module includes a communication chip IC3 and a clamping unit Z1.

10. A digital display meter for measuring electricity energy and power grid quality according to claim 1, characterized in that, The power module includes a power chip IC5 and the power chip IC5 is connected to a transformer B1. The power chip IC5 is connected to a bridge rectifier BRIDGE1 through an inductor L1. The power module also has a voltage regulator chip IC4.

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