CN217767222U - CAN and 485 communication conversion circuit for coal mining machine - Google Patents

Abstract

The utility model discloses a CAN and 485 communication converting circuit for coal-winning machine, include: the controller comprises a core control module, an RS485 interface module, a CAN bus interface module and a power module which are arranged on a frequency converter mainboard, wherein the RS485 interface module, the CAN bus interface module and the power module are respectively connected with the core control module; the core control module is communicated with the main controller through a CAN bus interface module; the core control module is communicated with the frequency converter through an RS485 interface module in an RS485 manner; the power supply module is used for supplying power to the core control module. Can realize the interconversion of CAN and 485 signals between master controller and the converter through this communication converting circuit, realize data transmission, each part snap-on of circuit is on the converter mainboard, and the signal does not need the transfer, reduces the signal transmission link, reduces the fault point.

Description

CAN and 485 communication conversion circuit for coal mining machine

Technical Field

The utility model relates to a colliery excavating machinery technical field especially relates to a CAN and 485 communication converting circuit for coal-winning machine.

Background

An ACS880 series frequency converter for the existing coal mining machine is communicated with a main controller in a CAN bus mode, and an original FCAN-01 communication module is used in the frequency converter and is used for finishing communication control between the main controller and the frequency converter.

In practical application, the FCAN-01 module only has one screw fixing position, a contact pin between the FCAN-01 module and a main board of a frequency converter is short, and a communication signal between a main controller and the frequency converter is interrupted occasionally in a coal mining process, so that a coal mining machine stops traction automatically.

SUMMERY OF THE UTILITY MODEL

In order to solve the partial or whole technical problem that exists among the above-mentioned prior art, the utility model provides a CAN and 485 communication converting circuit for coal-winning machine. The technical scheme is as follows:

the utility model provides a CAN and 485 communication converting circuit for coal-winning machine, includes: the controller comprises a core control module, an RS485 interface module, a CAN bus interface module and a power module which are arranged on a frequency converter mainboard, wherein the RS485 interface module, the CAN bus interface module and the power module are respectively connected with the core control module; the core control module is communicated with the main controller through the CAN bus interface module; the core control module is in RS485 communication with the frequency converter through the RS485 interface module; the power supply module is used for supplying power to the core control module.

In some optional implementations, the CAN bus interface module comprises CTM1051/CTM1051A chips with DC2500V isolation function.

In some optional implementations, the RS485 interface module includes an SP3481E chip, pins RE and DE of which control transceiving conversion, and pins RXD and TXD are used for data transmission and reception.

In some optional implementation manners, the system further comprises an RS422 interface module, the RS485 interface module is connected with the main frequency converter, and the RS422 interface module is connected between the main frequency converter and the slave frequency converter to perform master-slave control.

In some optional implementations, the RS422 interface module includes an SP1490E chip.

In some optional implementations, the SP1490E chip is isolated from the core control module by the admm 1201B, and performs anti-surge protection and current protection.

In some optional implementation manners, the core control module includes an STM32 single chip microcomputer.

In some optional implementations, the core control module is further configured to identify the models of the master and the frequency converter, so as to achieve an encryption handshake protocol between the frequency converter and the master.

The utility model discloses technical scheme's main advantage as follows:

the utility model provides a CAN and 485 communication converting circuit for coal-winning machine CAN realize CAN and 485 signal interconversion between master controller and the converter, realizes data transmission, and each part snap-on of circuit is on the converter mainboard, and the signal does not need the transfer, CAN cancel FCAN-01 module, reduces the signal transmission link, reduces the fault point. The circuit is fixed by adopting multi-point fixing, so that the fixing is more reliable, and the signal transmission is more reliable.

Drawings

The accompanying drawings, which are set forth herein, serve to provide a further understanding of the embodiments of the present invention and constitute a part of this specification, and the exemplary embodiments and descriptions thereof are illustrative of the invention and do not constitute a limitation on the invention. In the drawings:

fig. 1 is a schematic diagram of a CAN and 485 communication conversion circuit for a coal mining machine according to an embodiment of the present invention connected between a frequency converter and a master controller;

fig. 2 is a schematic diagram illustrating a connection relationship between modules of a CAN and 485 communication conversion circuit for a coal mining machine according to an embodiment of the present invention;

fig. 3 is a schematic front view of a circuit board of a CAN and 485 communication conversion circuit for a coal mining machine according to an embodiment of the present invention;

fig. 4 is a schematic reverse side view of a circuit board of a CAN and 485 communication conversion circuit for a coal mining machine according to an embodiment of the present invention.

Detailed Description

To make the purpose, technical solution and advantages of the present invention clearer, the following will combine the embodiments of the present invention and the corresponding drawings to clearly and completely describe the technical solution of the present invention. It is obvious that the described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

The technical solution provided by the embodiments of the present invention is described in detail below with reference to the accompanying drawings.

The embodiment of the utility model provides a CAN and 485 communication converting circuit for coal-winning machine, as shown in figure 1 and figure 2, include: the controller comprises a core control module, an RS485 interface module, a CAN bus interface module and a power module which are arranged on a frequency converter mainboard, wherein the RS485 interface module, the CAN bus interface module and the power module are respectively connected with the core control module; the core control module is in CAN communication with the master controller through the CAN bus interface module; the core control module is communicated with the frequency converter through an RS485 interface module in an RS485 manner; the power supply module is used for supplying power to the core control module.

When in use, the switching circuit is connected between the main controller and the frequency converter. The instruction that the master controller sent leads to CAN bus and sends to CAN bus interface module, then reaches the core control module, and RS485 communication is carried out through RS485 interface module between with the converter to the core control module, sends corresponding command signal to the converter, and the converter carries out the instruction of master controller. Meanwhile, the frequency conversion sends operation data to the core control module through RS485 communication, after the operation data reaches the core control module, the core control module sends the operation data to the main controller through CAN bus communication, and the main controller CAN monitor the operation condition of the frequency converter.

It is visible, the embodiment of the utility model provides a CAN and 485 communication converting circuit for coal-winning machine CAN realize CAN and 485 signal interconversion between master controller and the converter, realizes data transmission, and each part snap-on of circuit does not need the transfer on the converter mainboard, and the FCAN-01 module CAN cancel, reduces the signal transmission link, reduces the fault point. The circuit is fixed by adopting multi-point fixing, so that the fixing is more reliable, and the signal transmission is more reliable.

In some optional implementations of this embodiment, the CAN bus interface module includes a CTM1051/CTM1051A chip with DC2500V isolation function. The CTM1051/CTM1051A is a general CAN transceiver chip with isolation, and all necessary CAN isolation and CAN receiving and transmitting devices are integrated in the chip, and are integrated on the chip with less than 3 square centimeters. The main function of the chip is to convert the logic levels to the differential levels of the CAN bus and to have an isolation function of DC 2500V. The chip conforms to the ISO 11898 standard and CAN interact with other CAN transceiver products conforming to the ISO 11898 standard. CTM1051 supplies 5V power, and CTM1051A supplies 3.3V power. The rate can reach 1Mbit/s at most. In addition, the safety performance can be improved through the isolation performance, the electromagnetic interference resistance is high, the high-temperature and low-temperature characteristics are good, and the technical requirements of industrial products are met.

In some optional implementations of this embodiment, the RS485 interface module includes an SP3481E chip, pins RE and DE of which control transceiving conversion, and pins RXD and TXD are used for data transmission and reception. And the SP3481E is used as an RS485 interface module, and data is transmitted and received in a differential mode. SP3481E is a +3.3V low power half-duplex transceiver family, compliant with the specifications of RS-485 and RS-422 serial protocols, using Sipex BiCMOS technology, allowing low power operation without sacrificing performance, up to 10Mbps under load, and equipped with low power down mode.

In some optional implementation manners of this embodiment, the communication conversion circuit further includes an RS422 interface module, in this example, the frequency converter includes a master frequency converter and a slave frequency converter, the RS485 interface module is connected to the master frequency converter, and the RS422 interface module is connected between the master frequency converter and the slave frequency converter, so that the master-slave control of the frequency converter is implemented.

During master-slave control, the command of the master controller is sent to the master frequency converter through the communication conversion circuit, and the master frequency converter broadcasts a corresponding control signal to the slave frequency converter through RS422 communication.

For example, the RS422 interface module may adopt an SP1490E chip as a conversion chip, and an isolation process is performed between the SP1490E chip and the core control module, the SP1490E chip and the core control module are isolated by an admum 1201B, and an anti-surge protection is performed at the interface, and a current protection is performed by using a fuse, and a dial switch is added to perform a controllable access of a terminal resistor.

In this embodiment, the core control module (i.e., CPU) is a control part of the whole circuit, which may be an STM32 single chip circuit, and has 36 pins to control data communication between the RS485 terminal and the CAN bus terminal.

In some optional implementations of this embodiment, the core control module is further configured to identify models of the master and the frequency converter, so as to achieve an encryption handshake protocol between the frequency converter and the master. According to the arrangement, only after the models of the main controller and the frequency converter are matched, the core control module controls the main controller and the frequency converter to communicate. For example, when the system is applied, whether the main controller and the frequency converter belong to the products of the company or not is detected, and the communication and the operation can be carried out only after the main controller and the frequency converter are matched with the products of the company.

Through the communication conversion circuit, the main controller can also perform functions of encryption and decryption control, ID number modification and the like on the frequency converter.

All parts are arranged on a circuit board, and the schematic diagrams of the front surface and the back surface of the circuit board can be respectively seen in the attached figures 3 and 4.

Optionally, the embodiment of the present invention provides a communication conversion circuit, which may further include an indicator light for indicating the circuit state. Illustratively, a first indicator light for indicating normal communication of the CAN bus, a second indicator light for indicating normal communication of the RS485, and a third indicator light for indicating normal communication of the RS422 master-slave control CAN be included.

It is noted that, in this document, relational terms such as "first" and "second," and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. In addition, "front", "rear", "left", "right", "upper" and "lower" in this document are referred to the placement states shown in the drawings.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims (8)

1. The utility model provides a CAN and 485 communication converting circuit for coal-winning machine which characterized in that includes: the controller comprises a core control module, an RS485 interface module, a CAN bus interface module and a power module which are arranged on a frequency converter mainboard, wherein the RS485 interface module, the CAN bus interface module and the power module are respectively connected with the core control module;

the core control module is communicated with the main controller through the CAN bus interface module;

the core control module is communicated with the frequency converter through the RS485 interface module in an RS485 manner;

the power supply module is used for supplying power to the core control module.

2. The CAN and 485 communication conversion circuit for the coal mining machine according to claim 1, wherein the CAN bus interface module comprises CTM1051/CTM1051A chips with DC2500V isolation function.

3. The CAN and 485 communication conversion circuit for the coal mining machine according to claim 1, wherein the RS485 interface module comprises an SP3481E chip, pins RE and DE of the chip control transceiving conversion, and pins RXD and TXD are used for data transmission and reception.

4. The CAN and 485 communication conversion circuit for the coal mining machine according to claim 1, further comprising an RS422 interface module, wherein the RS485 interface module is connected with the main frequency converter, and the RS422 interface module is connected between the main frequency converter and the slave frequency converter to perform master-slave control.

5. The CAN and 485 communication conversion circuit for the coal mining machine according to claim 4, wherein the RS422 interface module comprises an SP1490E chip.

6. The CAN and 485 communication conversion circuit for the coal cutter as claimed in claim 5, wherein the SP1490E chip is isolated from the core control module by ADUM1201B and performs anti-surge protection and current protection.

7. The CAN and 485 communication conversion circuit for the coal mining machine according to claim 1, wherein the core control module comprises an STM32 single chip microcomputer.

8. The CAN and 485 communication conversion circuit for the coal mining machine according to claim 1, wherein the core control module is further used for identifying the models of the main controller and the frequency converter so as to achieve an encryption handshake protocol between the frequency converter and the main controller.

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