CN205353681U - Embedded converter control structure based on STM32 - Google Patents

Abstract

The utility model discloses an embedded frequency converter control structure based on STM32, which includes a master station and a slave station, the master station includes a control device, the slave station includes a frequency converter, the control device includes a control chip module, and a device connected to the control chip module Interface module, input module, output module; the interface module includes the master station RS485 interface, the frequency converter is provided with the slave station RS485 interface matching the master station RS485 interface, the control chip module includes the STM32 control chip; it also includes the control chip module connected to the control chip, Power supply modules for interface modules, input modules and output modules. The inverter can be operated through the key input unit of the input module, and remote monitoring can also be realized through the computer connected by Ethernet or the Internet.

Description

An embedded frequency converter control structure based on STM32

technical field

The utility model belongs to the field of frequency converter control, in particular to an embedded frequency converter control structure based on STM32.

Background technique

At present, frequency converters have been widely used in the field of motor speed regulation. With the development of frequency converter technology, frequency converters have realized more and more functions, and correspondingly more and more parameters need to be set and modified, which brings a lot of inconvenience to users. , technicians also need to spend a lot of time to set the parameters. Usually, the inverter is equipped with an SPI keyboard, but the reliable transmission distance of SPI is only 1-3m, which cannot be transmitted over a long distance and has low anti-interference ability. In addition, in industrial applications, it is often necessary to use several or even dozens of units to operate. When initializing in the traditional way, it is necessary to set parameters one by one, and to modify parameters one by one, which is extremely inefficient. The function of the inverter parameter replicator based on the single-chip microcomputer is limited, and when there are multiple inverters, each inverter works independently. The monitoring and management of multiple frequency converters brings great inconvenience.

Invention content:

The purpose of this utility model is to provide a kind of embedded frequency converter control structure based on STM32, can, to overcome the problem existing in the background technology.

In order to achieve the above object, the technical solution of the utility model is:

An STM32-based embedded inverter control structure, including a master station and a slave station, the master station includes a control device, the slave station includes a frequency converter, the control device includes a control chip module, and an interface module and an input module connected to the control chip module , output module; the interface module includes the RS485 interface of the master station, the frequency converter is equipped with a slave station RS485 interface matching the RS485 interface of the master station, and the control chip module includes an STM32 control chip; it also includes a control chip module, an interface module, and an input module connected to the and the power module of the output module.

Preferably, the interface module also includes an Ethernet interface for connecting the computer and the Internet.

Preferably, the Ethernet interface includes an ENC28J60 Ethernet card.

Preferably, the slave station includes several frequency converters, each of which is provided with a slave station RS485 interface, and each slave station RS485 interface is connected to the master station RS485 interface.

Preferably, the output module includes a status indication unit and a digital tube display unit.

Preferably, the status indication unit is an LED lamp.

Preferably, the digital tube display unit is a three-segment digital tube 3361AH.

Preferably, the input module includes a knob speed regulating unit and a key input unit.

Preferably, the knob speed regulating unit includes an adjustable potentiometer.

The beneficial effect of the utility model is that it provides an embedded inverter control device based on STM32, which is used to realize the functions of reading, writing and copying inverter parameters and has a remote monitoring function, and can also control the start and stop of the motor through buttons. The speed can be adjusted directly through the knob, and even the remote monitoring can be carried out through the Internet and the running status and parameters can be saved in real time. The structure described in this practical information can be used alone with one inverter of the slave station through the control device of the master station, and can also be used in a network with multiple inverters of the slave station. The frequency converter can be operated through the key input unit of the input module, and remote monitoring can also be realized through the computer connected by Ethernet or the Internet.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the utility model embodiment,

Fig. 2 is a schematic structural diagram of a control device according to an embodiment of the present invention.

In the figure: 1-control device, 2-inverter, 3-master station RS485 interface, 4-slave station RS485 interface, 5-Ethernet interface, 6-interface module, 7-control chip module, 8-output module, 8.1 -status indication unit, 8.2-digital tube display unit, 9-input module, 9.1-key input unit, 9.2-knob speed control unit, 10-computer, 11-Internet.

detailed description

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

An STM32-based embedded frequency converter control structure, including a master station and a slave station, the master station includes a control device 1, the slave station includes a frequency converter 2, the control device 1 includes a control chip module 7, and the control chip module 7 is connected The interface module 6 , the input module 9 and the output module 8 also include a power module connected to the control chip module 7 , the interface module 6 , the input module 9 and the output module 8 .

The slave station includes several frequency converters 2 , each of which is provided with a slave station RS485 interface 4 , and each slave station RS485 interface 4 is connected to the master station RS485 interface 3 . The control device 1 acts as the ModBus master station, and the inverter 2 acts as the ModBus slave station. It supports a maximum of 247 slave stations, but generally no more than 32 in order to reduce the consultation time. Using the RS485 interface, the longest transmission distance is about 1219m. Using this device can realize long-distance control without connecting to Ethernet, which greatly facilitates the operator.

The control chip module 7 includes an STM32 control chip. The chip chooses STM32L151C6. The chip comes with 4KEEPROM storage space to reduce the use of EEPROM chips. The 4KEEPROM storage space that comes with the chip can store 1,000 parameter values and register addresses, which is enough for inverter 2 parameter storage. The μC/OS-II embedded operating system is transplanted into the STM32 chip. The μC/OS-II has the characteristics of convenient transplantation, small code size, strong real-time performance, high reliability, and the kernel can be tailored. Resource management can be effectively realized through the μC/OS-II operating system. The ModBus-RTU mode is used to transmit between the control device 1 and the frequency converter 2, and the real-time performance is strong.

The interface module 6 includes a master station RS485 interface 3 and an Ethernet interface 5 . The inverter 2 is equipped with a slave station RS485 interface 4 matching the master station RS485 interface 3, and the Ethernet interface 5 includes an ENC28J60 Ethernet card for connecting the computer 10 and the Internet 11, and the ENC28J60 is used as the Ethernet of any controller equipped with SPI Interface 5, the data transmission rate is up to 10Mb/s, and the ENC28J60 is connected to the SPI2 interface of the STM32. The Ethernet module in the control device 1 can be connected to the Ethernet, and the centralized monitoring and management of the inverter 2 can be realized through the PC terminal in the Ethernet, and the remote monitoring of the inverter 2 can be realized by connecting to the Internet. Connect with a computer or INTERNET through a network cable to realize PC-side control and INTERNET remote control, and communicate according to the TCP/IP protocol.

The output module 8 includes a status indicating unit 8.1 and a digital tube display unit 8.2, the status indicating unit 8.1 is an LED light, and the LED light of the status indicating unit 8.1 indicates the type of the digital tube display parameter and the motor running/stopping, forward/reverse by turning on and off state. The digital tube display unit 8.2 is a three-segment digital tube 3361AH, which can display 3-digit numbers, 8-bit segment selection, and 6-bit chip selection. It uses 74LS14 as the segment selection driver and an ordinary triode as the chip selection driver. It can display various parameter values and motor parameters. Operating status.

The input module 9 includes a knob speed regulating unit 9.2 and a key input unit 9.1, and the knob speed regulating unit 9.2 includes an adjustable potentiometer. The key input unit 9.1 can directly operate the frequency converter 2 through key selection, such as start, stop, parameter copy and other operations. The adjustable potentiometer of the knob speed control unit 9.2, after the potential value is converted by AD, the corresponding motor speed can be assigned to the register through the ModBus protocol, so that the motor speed can be directly adjusted by adjusting the potentiometer.

Status indication unit 8.1 uses ordinary LED lamps to indicate the running status of the motor, selects the operation parameters of the nixie tube display by pressing the button, and controls the output status of the inverter 2 to control the motor by pressing the button. At the same time, the parameters in the frequency converter 2 can be written into the EEPROM of the control device 1 of the frequency converter 2 for storage, or the parameters in the EEPROM can be written into the register of the frequency converter 2 .

It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should belong to the protection scope of the appended claims of the present utility model. Parts not described in detail in this specification belong to the prior art known to those skilled in the art.

Claims (9)

1. the embedded Frequency Converter Control structure based on STM32, it is characterized in that: include main website and slave station, described main website includes controlling device (1), described slave station includes converter (2), described control device (1) includes control chip module (7), and is connected to the interface module (6) of described control chip module (7), input module (9), output module (8)；Described interface module (6) includes main website RS485 interface (3), described converter (2) is provided with slave station RS485 interface (4) matched with described main website RS485 interface (3), and described control chip module (7) includes STM32 control chip；Also include the power module being connected to described control chip module (7), interface module (6), input module (9) and output module (8).

2. a kind of embedded Frequency Converter Control structure based on STM32 according to claim 1, it is characterised in that: described interface module (6) also includes the Ethernet interface (5) for connecting computer (10) and the Internet (11).

3. a kind of embedded Frequency Converter Control structure based on STM32 according to claim 2, it is characterised in that: described Ethernet interface (5) includes ENC28J60 Ethernet card.

4. a kind of embedded Frequency Converter Control structure based on STM32 according to claim 1, it is characterized in that: described slave station includes several converter (2), several described converters (2) are respectively provided with slave station RS485 interface (4) described in, and each described slave station RS485 interface (4) is connected to described main website RS485 interface (3).

5. a kind of embedded Frequency Converter Control structure based on STM32 according to claim 1, it is characterised in that: described output module (8) includes state indication unit (8.1) and charactron display unit (8.2).

6. a kind of embedded Frequency Converter Control structure based on STM32 according to claim 5, it is characterised in that: described state indication unit (8.1) is LED.

7. a kind of embedded Frequency Converter Control structure based on STM32 according to claim 5, it is characterised in that: described numeral method unit (8.2) is three segment numeral pipe 3361AH.

8. a kind of embedded Frequency Converter Control structure based on STM32 according to claim 1, it is characterised in that: described input module (9) includes knob speed adjustment unit (9.2) and key-press input unit (9.1).

9. a kind of embedded Frequency Converter Control structure based on STM32 according to claim 8, it is characterised in that: described knob speed adjustment unit (9.2) includes scalable potentiometer.