CN202661546U - Electric energy data acquisition device based on double central processing units (CPU) - Google Patents

Abstract

The utility model discloses an electric energy data acquisition device based on dual CPUs, which comprises a power supply module, a data acquisition module, a communication module, a human-computer interaction module, a first CPU module for processing and analyzing the collected data, and a first CPU module for processing The second CPU module of human-computer interaction and communication functions; the power supply module and the data acquisition module are respectively connected with the first CPU module; the communication module and the human-computer interaction module are respectively connected with the second CPU module; the data acquisition module It is also connected with the power supply module; the first CPU module is connected with the second CPU module through SPI. The utility model improves the efficiency of electric energy collection and transmission by adopting dual CPUs, and the wireless communication and simplified design realized make it applicable to various distribution network environments, with low cost, high efficiency and strong applicability.

Description

An electric energy data acquisition device based on dual CPU

technical field

The utility model relates to an electric energy data acquisition device in a distribution network of an electric power system, in particular to a dual CPU-based electric energy data acquisition device for a distribution network capable of real-time communication.

Background technique

In the environment of energy saving and emission reduction, the power system needs a large number of intelligent terminals to collect electric energy data, especially the distribution network system with a large amount of data, as an important basis for energy-saving management and energy-saving monitoring. At present, there are many types of electric energy collection devices or meter reading systems on the market, but most of these products have the following shortcomings in the actual application of distribution networks: 1) Mainly designed for the main network, the cost is high, and the application in the distribution network is not very good Ideal; 2) Most of them only use one CPU for data processing and realizing human-computer interaction, communication and other functions, the speed is slow, and it is impossible to complete the real-time collection of multi-point and multi-point electric energy; 3) The communication means are single, and the technical means used It is relatively backward, which is not conducive to the realization of networked monitoring of distribution network power energy.

Utility model content

In order to overcome the above-mentioned shortcomings and deficiencies of the prior art, the purpose of this utility model is to provide a low-cost, high-efficiency dual-CPU-based electric energy data acquisition device developed for the distribution network.

The purpose of this utility model is achieved through the following technical solutions:

An electric energy data acquisition device based on dual CPUs, including a power supply module, a data acquisition module, a communication module, a human-computer interaction module, a first CPU module for processing and analyzing the collected data, and a first CPU module for processing human-computer interaction and communication function of the second CPU module;

The power supply module and the data acquisition module are respectively connected to the first CPU module;

The communication module and the human-computer interaction module are respectively connected to the second CPU module;

The data acquisition module is also connected with the power supply module;

The first CPU module is connected to the second CPU module through SPI.

The data acquisition module includes a current and voltage acquisition module and a frequency acquisition module, the current and voltage acquisition module and the frequency acquisition module are respectively connected to the first CPU module, and the current and voltage acquisition module is also connected to a power supply module.

The current and voltage acquisition module includes a three-phase and neutral line voltage and current signal acquisition channel interface, a signal conditioning circuit, a program-controlled amplifier circuit, a filter circuit, an A/D converter, and an external crystal oscillator circuit. The three-phase and neutral line voltage The current signal acquisition channel interface, the signal conditioning circuit, the program-controlled amplifier circuit, the filter circuit, and the A/D converter are connected in sequence, and the A/D converter is also connected with the power supply module and the first CPU module respectively.

The frequency acquisition module includes a frequency acquisition channel entrance, a signal conditioning circuit and a frequency tracker connected in sequence.

The communication module includes an RS232 communication unit and a Zigbee communication unit.

The A/D converter is composed of two MAX125AEAX chips.

The second CPU module is also connected with a temperature measurement module.

The second CPU module is also connected with an external real-time clock module, and the external real-time clock module is connected with a watchdog reset circuit.

Compared with the prior art, the utility model has the following advantages and beneficial effects:

(1) Dual CPUs are adopted, and the real-time monitoring result is obtained through the processing and analysis of the first CPU module, and the second CPU module reads the monitoring result through the SPI interface and controls the real-time response of the human-computer interaction module and the communication module. This working method improves the working efficiency of the CPU, realizes real-time data analysis without affecting the speed of human-computer interaction and uploading monitoring data, and facilitates the expansion of future functional modules.

(2) The data acquisition module adopts 4 voltage, 4 current and 1 frequency signal interfaces, and the device with simplified design is low in price and strong in applicability, especially for promotion in the distribution network;

(3) Using RS232 and Zigbee two communication methods, the Zigbee wireless network communication function realized, without wiring restrictions, can be applied to various distribution network environments, such as office buildings, residences, and various production enterprise workshops, etc., which helps to promote Distribution network data network monitoring;

(4) The data acquisition module adopts a program-controlled amplifying circuit, and the realized program-controlled amplifying function enhances the applicability of the utility model.

Description of drawings

Fig. 1 is a schematic diagram of the composition of the utility model based on dual-CPU electric energy data acquisition device.

FIG. 2 is a schematic diagram of the composition of the data acquisition module of the present invention.

Fig. 3 is the working flow diagram of the electric energy data acquisition device based on dual CPUs of the present invention.

Detailed ways

The utility model will be described in further detail below in conjunction with the embodiments and accompanying drawings, but the implementation of the utility model is not limited thereto.

Example

As shown in Figure 1, the present embodiment is an electric energy data acquisition device based on dual CPUs, including a power supply module, a data acquisition module, a communication module, a human-computer interaction module, a CPU module 1 for processing and analyzing the collected data, and a user The CPU module 2 for processing human-computer interaction and communication functions; the power supply module and the data acquisition module are respectively connected to the CPU module 1; the communication module and the human-computer interaction module are respectively connected to the CPU module 2; the data acquisition module is also connected It is connected with the power supply module; the second CPU module is also connected with an external real-time clock module and a temperature measurement module, and the external real-time clock module is connected with a watchdog reset circuit. The human-computer interaction module is provided with a liquid crystal display and a keyboard.

Both CPU module 1 and CPU module 2 are ATmega128-A, which are high-performance, low-power 8-bit microprocessors with advanced RISC structure, and meet the functional and economical requirements of this device. The data acquisition module collects and converts the external three-phase and neutral line voltage and current signals and frequency signals, and the CPU module 1 processes and analyzes the real-time monitoring results, and the CPU module 2 reads the monitoring results through the SPI interface and controls the human-computer interaction module and Real-time response of the communication module. This working method improves the working efficiency of the CPU, realizes real-time data analysis without affecting the speed of human-computer interaction and uploading monitoring data, and facilitates the expansion of future functional modules.

The external real-time clock module provides a real-time clock to the CPU module 2, and has a watchdog reset circuit to monitor the running program of the CPU module 2; the CPU module 2 is connected to the temperature measurement module, and the ambient temperature can be measured by connecting the external AD590; in the human-computer interaction module The keyboard can be used to input parameter settings, and the liquid crystal display adopts TG12864B-03T interface to realize the function of real-time display of monitoring data.

The communication module provides two communication methods (RS232 and Zigbee), and if necessary, one of the communication methods can be used to upload real-time monitoring data to the master station. Zigbee communication technology provides a low-power, short-distance wireless communication method, which is very suitable for the electric energy data collection device of the distribution network, and is conducive to the large-scale promotion and application of the electric energy collection device; and the RS232 communication unit can also be expanded to GPRS way of communication.

As shown in Figure 2, the data acquisition module includes a current and voltage acquisition module and a frequency acquisition module, the current and voltage acquisition module and the frequency acquisition module are respectively connected to the CPU module 1, and the current and voltage acquisition module is also connected to the power supply module connect.

As shown in Figure 2, the current and voltage acquisition module includes three-phase and neutral line voltage and current signal acquisition channel interfaces (including 4 voltage and 4 current real-time acquisition channel interfaces), a signal conditioning circuit, a program-controlled amplifier circuit, and a filter circuit , A/D converter, external crystal oscillator circuit, the three-phase and neutral line voltage and current signal acquisition channel interface, signal conditioning circuit, program-controlled amplifier circuit, filter circuit, and A/D converter are connected in sequence, and the A/D The converter is also connected to the power supply module and the CPU module 1 respectively; wherein the A/D converter is composed of two MAX125AEAX chips. The frequency acquisition module includes a frequency acquisition channel entrance, a signal conditioning circuit and a frequency tracker connected in sequence. The external initial signal can be obtained by the on-site secondary transformer or this device, in which the three-phase and neutral line voltage and current signals pass through the signal conditioning and program-controlled amplification circuit to obtain a signal suitable for the range of the electric energy meter used, and filter out the measurement range through the filter circuit The high-order harmonics are converted by a 10-bit A/D converter (using MAX125AEAX chip), and directly transmitted to the CPU module 1 after conversion; the voltage signal is adjusted by the signal conditioning circuit, and then processed by the frequency tracker to obtain The frequency signal is then sent to CPU module 1.

MAX125AEAX is powered by an external power supply module, and a 16MHz clock signal is provided by an external crystal oscillator circuit, and its sampling accuracy meets the requirements of this device. MAX125AEAX is a 4-channel 10-bit A/D device with high conversion precision, high conversion rate (133ksps), low power consumption, and its conversion results are output sequentially in the form of complement code, so MAX125AEAX fully meets the requirements of this device.

As shown in Figure 3, the working process of the utility model is as follows: after starting to work, at first initialize the hardware system and system self-diagnosis, CPU module 1 reads the information data after receiving the interrupt signal of the acquisition module, and judges whether the signal data is All are ready, if not all ready, continue to wait for the interrupt signal to read the signal data; if all are ready, CPU module 1 performs analysis and calculation of various electric energy; CPU module 2 reads the monitoring results through the SPI interface, and responds to interactive commands And save the setting parameters or display the monitoring information; if there are communication data events to be processed, the monitoring data will be sent to the master station according to the selected communication interface.

The above-mentioned embodiment is a preferred implementation mode of the present utility model, but the implementation mode of the present utility model is not limited by the described embodiment, and any other changes, modifications, modifications, Substitution, combination, and simplification should all be equivalent replacement methods, and are all included in the protection scope of the present utility model.

Claims (8)

1. A kind of electric energy data acquisition device based on double CPU, it is characterized in that, comprise power supply module, data acquisition module, communication module, human-computer interaction module, the first CPU module for processing and analyzing the collected data and for A second CPU module that handles human-computer interaction and communication functions; The power supply module and the data acquisition module are respectively connected to the first CPU module; The communication module and the human-computer interaction module are respectively connected to the second CPU module; The data acquisition module is also connected with the power supply module; The first CPU module is connected to the second CPU module through SPI. 2. the electric energy data acquisition device based on double CPU according to claim 1, is characterized in that, described data acquisition module comprises current and voltage acquisition module and frequency acquisition module, described current and voltage acquisition module, described frequency acquisition module They are respectively connected to the first CPU module, and the current and voltage acquisition module is also connected to the power supply module. 3. The electric energy data acquisition device based on dual CPUs according to claim 2, wherein the current and voltage acquisition module includes a three-phase and neutral line voltage and current signal acquisition channel interface, a signal conditioning circuit, and a program-controlled amplifier circuit , filter circuit, A/D converter, external crystal oscillator circuit, the three-phase and neutral line voltage and current signal acquisition channel interface, signal conditioning circuit, program-controlled amplifier circuit, filter circuit, A/D converter are connected in sequence, and the The A/D converter is also connected to the power module and the first CPU module respectively. 4. The electric energy data acquisition device based on dual CPUs according to claim 2, wherein the frequency acquisition module comprises a frequency acquisition channel entrance, a signal conditioning circuit and a frequency tracker connected in sequence. 5. The electric energy data acquisition device based on dual CPUs according to claim 1, wherein the communication module includes an RS232 communication unit and a Zigbee communication unit. 6. The electric energy data acquisition device based on dual CPUs according to claim 3, wherein the A/D converter is composed of two MAX125AEAX chips. 7. The electrical energy data acquisition device based on dual CPUs according to claim 1, wherein the second CPU module is also connected with a temperature measurement module. 8. The electric energy data acquisition device based on dual CPUs according to claim 1, wherein the second CPU module is also connected with an external real-time clock module, and the external real-time clock module is connected with a watchdog reset circuit .

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