CN204425050U - Based on the low-voltage circuit breaker intelligent controlling device of LPC single-chip microcomputer - Google Patents

Abstract

The utility model is an intelligent control device for a low-voltage circuit breaker based on an LPC single-chip microcomputer, which mainly includes a main control processing module, an electric energy measurement module, an Ethernet communication module, and a data acquisition module. The circuit breaker intelligent control device collects current parameter information by the acquisition module, sends the collected data to the electric energy metering module, measures each parameter, and transmits the metering result to the main control processing module through the SPI bus, stores and analyzes the obtained data, and sends out control Instructions and alarm signals, the main control processing module communicates with the host computer through the Ethernet communication module, and sends the data to the monitoring center, which is convenient for managers to perform data processing, analysis and direct observation in the monitoring center. The low-voltage circuit breaker intelligent control device based on the LPC single-chip microcomputer of the utility model has the advantages of low cost, high precision, intelligence and the like.

Description

Intelligent control device of low-voltage circuit breaker based on LPC single-chip microcomputer

technical field

The utility model belongs to the technical field of Ethernet communication, and relates to the intelligentization and networking of low-voltage distribution system applications.

Background technique

With the rapid development of the national economy, electricity plays a very important role in industrial production and people's life. How to effectively ensure the stable operation of the power system, improve the quality of power supply, and protect electrical equipment and personal safety has become a topic of widespread concern. Circuit breakers, commonly known as automatic switches, are important electrical components in low-voltage power distribution systems. Their function is to protect electrical power distribution networks and industrial equipment from damage. Therefore, circuit breakers are widely used in power distribution systems, power transmission systems and electrical equipment, such as various power stations, substations, vehicle systems (including air-conditioned locomotives, electric repair vehicles), marine systems, etc. It is necessary to strengthen the intelligent control management of the power distribution system, so that the load current can be turned on or off under normal working conditions, and it is allowed to automatically cut off the circuit under abnormal conditions (overload, short circuit, undervoltage, etc.), so as to protect the electrical equipment and cables, etc.; after troubleshooting, the power supply can be quickly restored. The circuit breaker can be operated locally or remotely, and it is safe and convenient.

Contents of the invention

Purpose of the invention: In view of the above existing problems and defects, use the advantages of intelligent control to develop a low-voltage circuit breaker intelligent control device based on LPC single-chip microcomputer, realize the protection function of the circuit breaker in the low-voltage power distribution system, and realize the low power consumption and low power consumption of power distribution automation. cost, networking, and intelligence.

Technical solution: In order to achieve the purpose of the above invention, the utility model adopts the following technical solution: the low-voltage circuit breaker intelligent control device based on LPC single-chip microcomputer includes a main control processing module, an electric energy metering module, an Ethernet communication module and a data acquisition module. Wherein: the data acquisition module collects the current signal by the current transformer, and transmits it to the ATT7022B through the acquisition port; the electric energy metering module acquires the acquisition signal by the ATT7022B acquisition port, realizes the measurement of active power and reactive power parameters, and passes the SPI bus Realize the transmission of metering parameters to the main control processing module; the main control processing module analyzes and stores the received data, compares the current values and action time thresholds of various fault protections pre-stored in FLASH, and outputs various control commands and alarm signal, if it is judged that the circuit breaks down, it will send a tripping signal, which is completed by the executive circuit; the Ethernet communication module sends the summary parameter information data to the host computer monitoring center through the Ethernet, and the monitoring center Storage and analysis to improve smart controller stability and reliability.

As a further improvement, the LPC1788 chip is connected to the FLASH address lines through A0-A14, and D0-D31 are connected to the data lines.

As a preference, the SPI bus pin of the ATT7022B chip is connected to the SPI interface of the LPC1788 chip to realize power parameter transmission.

Beneficial effects: Compared with the prior art, the utility model integrates the latest intelligent control device in the fields of sensor technology, electronic technology, instrumentation, IIC bus, wireless communication technology, etc., and the utility model adopts serial and Ethernet communication modes , has the advantages of low cost, convenient maintenance, high degree of automation and intelligence, and is very suitable for the management of low-voltage power distribution systems. It has obvious effects on improving the level of automation management, saving manpower and tripping early warning, and has high engineering application value and The market promotion value has a very broad application prospect.

Description of drawings

Fig. 1 is a block diagram of the utility model.

Fig. 2 is a schematic diagram of the main control processing module of the utility model.

Fig. 3 is a schematic diagram of the Ethernet communication module of the present invention.

Fig. 4 is a schematic diagram of the electric energy metering module of the utility model.

Fig. 5 is a schematic diagram of the data acquisition module of the utility model.

detailed description

Below in conjunction with accompanying drawing and specific embodiment, further set forth the utility model, should be understood that these embodiments are only used for illustrating the utility model and are not intended to limit the scope of the utility model, after having read the utility model, those skilled in the art will understand this utility model The modifications of various equivalent forms of the utility model all fall within the scope defined by the appended claims of the present application.

With reference to Fig. 1, Fig. 1 represents the functional block diagram of the present utility model. The data acquisition module collects the current signal, sends it to the electric energy metering module, measures each parameter, and transmits it to the main control processing module through the SPI interface. Obtain communication with the host computer, send parameters and operation content to the monitoring center, and the monitoring center will store the data after obtaining them, and perform further processing, and transmit instructions to the main control module through the Ethernet network.

Referring to Fig. 2, Fig. 2 shows the principle diagram of the main control processing module of the present invention. The core chip is LPC1788 with Cortex-M3 as the core, which includes LCD controller, USB full-speed Device/Host/OTG controller, CAN bus controller, SPI, SSP, IIC, IIS and external storage controller EMC and other resources, The central processing unit obtains the measurement data through the SPI bus, and the Ethernet communication realizes the wired transmission of the data. The external storage of the main control processing module includes the AT24C16 storage unit of the IIC bus and the SD card reading of the MCI interface.

Referring to FIG. 3, FIG. 3 shows a schematic diagram of the terminal Ethernet communication module of the present invention. The core chip is the RTL8019AS Ethernet controller, which is a highly integrated Ethernet control chip produced by Realtek. It has an 8/16-bit bus mode and integrates the IEEE802. ) and physical layer performance, compatible with NE2000, supports Ethernet full-duplex communication mode, supports UTP, AUI and BNC automatic detection. The Ethernet communication module realizes the two-way communication between the main control processing module and the upper computer, and realizes parameter transmission and instruction issuance.

Referring to Fig. 4, Fig. 4 shows the schematic diagram of the utility model terminal electric energy metering module. The core chip is ATT7022B, which is a high-precision three-phase electric energy dedicated metering chip, suitable for three-phase three-wire and three-phase four-wire applications. Integrates six second-order sigma-delta ADCs, reference voltage circuits, and digital signal processing circuits for all power, energy, effective value, power factor, and frequency measurements. It can measure the active power, reactive power, apparent power, active energy and reactive energy of each phase and combined phase. At the same time, it can also measure the current, voltage effective value, power factor, phase angle and frequency parameters of each phase, fully satisfying The demand for three-phase multi-rate multi-function electric energy meter. This module provides an SPI interface to facilitate the transfer of metering parameters and meter calibration parameters with the main control processing module.

Referring to FIG. 5, FIG. 5 shows a schematic diagram of the terminal data acquisition module of the present invention. The core chip is the current transformer ZMCT102. The current transformer is based on the principle of electromagnetic induction and consists of a closed iron core and windings. It can convert the primary current with a large value into a secondary current with a small value through a certain transformation ratio. For protection, measurement and other purposes. The data acquisition module sends the collected current parameter signal to the acquisition interface of the electric energy metering module, and the electric energy metering module measures each parameter.

The utility model is an intelligent control device for a low-voltage circuit breaker based on an LPC single-chip microcomputer, and relates to a method of collecting current parameter information through a current transformer, transmitting the acquired data to a power metering module, and sending it to a main control processing module through an SPI interface. Collect data for analysis and storage, output various control and alarm signals, and communicate with the host computer through the Ethernet interface, which has a good human-computer interaction function.

Claims (2)

1. The low-voltage circuit breaker intelligent control device based on the LPC single-chip microcomputer is characterized in that: it includes a main control processing module, an electric energy metering module, an Ethernet communication module, and a data acquisition module, wherein: The data acquisition module realizes current signal acquisition and sends the data to the electric energy metering module; The electric energy metering module receives the acquisition signal of the data acquisition module, and realizes the measurement of active power and reactive power parameters; The main control processing module receives the current signal processed by ATT7022B; The Ethernet communication module realizes the wired transmission of data to the monitoring center. 2. A kind of low-voltage circuit breaker intelligent control device based on LPC single-chip microcomputer according to claim 1, it is characterized in that: the main control processing module adopts ARM chip LPC1788; The processing modules are connected by SPI bus communication; the data acquisition module adopts the chip ZMCT102, and is connected with the electric energy metering module through the ADC interface; the Ethernet communication module adopts the RTL8019AS controller, and the main control processing module Data transmission is realized through the Ethernet interface.