CN216772411U

CN216772411U - 4-channel RS485 expansion board based on anti-surge technology

Info

Publication number: CN216772411U
Application number: CN202123388246.5U
Authority: CN
Inventors: 杨小平; 姚久明; 张衡; 郭文祥
Original assignee: Dahang Youneng Electrical Co ltd
Current assignee: Dahang Youneng Electrical Co ltd
Priority date: 2021-12-30
Filing date: 2021-12-30
Publication date: 2022-06-17
Anticipated expiration: 2031-12-30

Abstract

The utility model discloses a 4-channel RS485 expansion board based on an anti-surge technology, which comprises a power supply unit, a serial port expansion unit and a 4-channel RS485 communication unit, and is characterized in that: the 4-path serial port output of the serial port expansion unit is connected with the input end of the 4-path RS485 communication unit through an isolation module; the output ends of the 4 paths of RS485 communication units are connected with an external interface through an anti-surge circuit; the isolation module comprises a digital isolator and a triode. 4 serial ports are output through the expansion unit, 4 serial ports output generated by the expansion unit are connected with the RS485 chip through the digital signal isolator, receiving and transmitting switching and communication control are achieved, the output end of the RS485 chip is connected with the anti-surge protection circuit to form the whole circuit, and the function of communication control is achieved, so that the function of 4-way communication is achieved, the requirement of multipoint communication can be met, and the multi-point communication is easy to achieve.

Description

4-channel RS485 expansion board based on anti-surge technology

Technical Field

The utility model relates to the technical field of communication, in particular to a 4-channel RS485 expansion board based on an anti-surge technology.

Background

The RS485 expansion board is specially designed for the controller, and can conveniently convert a serial port into an RS485 interface. A standard wiring terminal and an RS485 interface are integrated on the RS485 expansion board, and an RS485 pin header is led out, so that a user can be connected with various RS485 devices in the most convenient mode.

With the development trend of digital, intelligent and terminal one/two-time integrated power distribution (network) equipment becoming more and more obvious, data acquisition, extraction, transmission and application of a station end system and a cloud end system are rapidly popularized. The digital system puts higher technical performance requirements on a sensor, an intelligent device, a mechanical mechanism, a secondary system and a primary structure of a primary and secondary fusion terminal of power distribution (network) equipment. The existing RS485 expansion board cannot meet the system requirements in an intelligent power distribution environment.

SUMMERY OF THE UTILITY MODEL

In view of this, the embodiment of the present invention provides a 4-channel RS485 expansion board based on an anti-surge technology, so as to solve the problem that the existing RS485 expansion board cannot meet the system requirements in an intelligent power distribution environment.

The embodiment of the utility model provides a 4-channel RS485 expansion board based on an anti-surge technology, which comprises a power supply unit, a serial port expansion unit and a 4-channel RS485 communication unit, wherein: the 4-path serial port output of the serial port expansion unit is connected with the input end of the 4-path RS485 communication unit through an isolation module; the output ends of the 4 paths of RS485 communication units are connected with an external interface through an anti-surge circuit; the isolation module comprises a digital isolator and a triode.

Optionally, the power supply unit adopts an AMS1117 power management chip; the input end of the AMS1117 power management chip is connected with an external 5V power supply and outputs a 3.3V power supply.

Optionally, the power supply unit further comprises a DC-DC power supply module; the input end of the DC-DC power supply module is connected with a 5V power supply to provide stable 5V power supply output.

Optionally, the serial port expansion unit adopts an XR21V1414 chip, and is used for receiving an RS485 signal and sending a serial signal; or, receive serial signals and transmit RS485 signals.

Optionally, the serial port expansion unit further comprises a USB expansion serial port module; the USB extended serial port module comprises an ESD protection device; the serial port interface of the XR21V1414 chip is connected with the ESD protection device through a board connector CON 2x 4.

Optionally, the first stage output by the RS485 communication unit is a first self-recovery fuse and a first TVS diode combination circuit; the second stage output by the RS485 communication unit is a GDT gas discharge tube.

Optionally, the digital isolator is model Si 8622; and the RS485 communication unit adopts a WS3085 chip.

Optionally, a first TX pin and a first RX pin of the XR21V1414 chip are connected to a VIB pin and a VOA pin of the Si8622 digital isolator, respectively; the VIA pin of the Si8622 digital isolator is connected with the RO pin of the WS3085 chip; a VOB pin of the Si8622 digital isolator is connected with a base electrode of the triode; the emitter of the triode is grounded; the collector of the triode is simultaneously connected with the RE pin and the DE pin of the WS3085 chip.

Optionally, the collector of the triode is also connected with a pull-up resistor.

The embodiment of the utility model has the following beneficial effects: the utility model provides a communication module based on prevent surge technique, it is including the power supply unit, serial ports extend the unit, 4 way 485 communication units, realize 4 ways serial ports output through extending the unit, 4 ways serial ports output that extend the unit and produce links to each other with the RS485 chip through the digital signal isolator, realize receiving and dispatching switching and communication control, RS485 chip output termination prevents surge protection circuit, constitute whole circuit, realize communication control's function, thereby realize the function of 4 ways of communication, can satisfy the demand of multiple spot communication, and easily realize.

Drawings

The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and not to be construed as limiting the utility model in any way, and in which:

fig. 1 shows a structural block diagram of a 4-channel RS485 expansion board based on an anti-surge technology in an embodiment of the present invention;

fig. 2 shows one of the circuit diagrams of the power supply unit of a 4-channel RS485 expansion board based on the anti-surge technology in the embodiment of the present invention;

fig. 3 shows a second circuit diagram of a power supply unit of a 4-channel RS485 expansion board based on an anti-surge technology in an embodiment of the present invention;

fig. 4 shows a serial port expansion unit chip and a peripheral circuit diagram of a 4-channel RS485 expansion board based on an anti-surge technology in an embodiment of the present invention;

fig. 5 shows a diagram of a USB expanded serial port module and a peripheral circuit of a 4-channel RS485 expansion board based on an anti-surge technology in an embodiment of the present invention;

fig. 6 shows a circuit diagram of a 4-channel RS485 communication unit of a 4-channel RS485 expansion board based on an anti-surge technology in the embodiment of the present invention;

fig. 7 shows a schematic diagram of a connection between a 4-channel RS485 communication unit of a 4-channel RS485 expansion board based on an anti-surge technology and a serial bus circuit in the embodiment of the present invention;

fig. 8 shows a circuit diagram of an RS232 communication unit of a 4-channel RS485 expansion board based on an anti-surge technology in an embodiment of the present invention;

fig. 9 shows a jumper connection schematic diagram of an RS485 communication unit and an RS232 communication unit of a 4-channel RS485 expansion board based on an anti-surge technology in an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 9, an embodiment of the present invention provides a 4-channel RS485 extension board based on an anti-surge technology, including a power supply unit, a serial port extension unit, and a 4-channel RS485 communication unit, where: the 4-path serial port output of the serial port expansion unit is connected with the input end of the 4-path RS485 communication unit through an isolation module; the output ends of the 4 paths of RS485 communication units are connected with an external interface through an anti-surge circuit; the isolation module comprises a digital isolator and a triode.

The 4-channel RS485 expansion board based on the anti-surge technology provided by the embodiment of the utility model realizes 4-channel serial port output through the serial port expansion unit, the 4-channel serial port output generated by the serial port expansion unit is connected with the RS485 chip through the digital signal isolator to realize receiving and transmitting switching and communication control, the output end of the RS485 chip is connected with the anti-surge protection circuit to form a whole circuit and realize the function of communication control, so that the function of 4-channel communication is realized, the requirement of multipoint communication can be met, and the implementation is easy.

The power supply unit comprises two power supply circuits, wherein one power supply circuit outputs a 3.3V power supply, and the other power supply circuit provides a 5V power supply.

As shown in fig. 2, the 3.3V power supply part is an external input 5V, and is converted into a 3.3V output through the AMS1117 chip; the purpose of supplying power for other circuits is achieved.

As shown in fig. 3, an external 5V power supply is input, and 5V output is stabilized through a DC-DC power supply module; the high voltage and the low voltage which a user may contact are isolated by the DC/DC transformer driving chip VPS8504, the safety of the user is guaranteed, and high-efficiency conversion efficiency is achieved; the output end and the power transformer VPT85BB-01A output stable 5V to supply power for other circuits.

As shown in fig. 4 and fig. 5, the serial port expansion unit uses XR21V1414 chip, which is an enhanced 4-channel hard disk USB universal asynchronous receiver and its application transmitter (output UART serial signal). The USB interface is completely available, conforms to the full-speed USB 2.0 specification and supports the USB data transmission rate of 12 Mbps. The USB interface also supports USB suspension, recovery and recovery remote wake-up operations; so as to realize four-way serial port output. The USB interface part is provided with an ESD protection device for protection. The ESD protection device adopts a TVS diode circuit.

As shown in fig. 6 and 7, for the communication part of the circuit, 4 serial outputs generated by the serial port expansion unit are connected with the RS485 chip WS3085 through the digital signal isolation module Si8622 to realize the transceiving switching and communication control, and the RS485 chip is 5V, half-duplex and has the characteristic of self-adaptive bus polarity. The output end is connected with the anti-surge protection circuit to form the whole circuit, and the function of communication control is realized.

As shown in fig. 8 and 9, in this embodiment, an RS232 communication circuit is further designed, so that the expansion board supports RS232 communication, and the expansion board may be connected to a three-core twisted pair, a three-core shielded wire, and the like.

Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the utility model, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. The utility model provides a 4 passageway RS485 extends board based on anti-surge technique, includes power supply unit, serial ports extension unit and 4 way RS485 communication units, its characterized in that:

the 4 serial port outputs of the serial port expansion unit are connected with the input ends of the 4 RS485 communication units through an isolation module;

the output ends of the 4 paths of RS485 communication units are connected with an external interface through an anti-surge circuit;

the isolation module comprises a digital isolator and a triode.

2. The 4-channel RS485 expansion board based on the anti-surge technology as claimed in claim 1, wherein the power supply unit adopts AMS1117 power management chip; the input end of the AMS1117 power management chip is connected with an external 5V power supply and outputs a 3.3V power supply.

3. The 4-channel RS485 expansion board based on the anti-surge technology according to claim 1, wherein the power supply unit further comprises a DC-DC power supply module; the input end of the DC-DC power supply module is connected with a 5V power supply to provide stable 5V power supply output.

4. The 4-channel RS485 expansion board based on the anti-surge technology according to claim 1, wherein the serial port expansion unit adopts an XR21V1414 chip for receiving RS485 signals and sending serial signals; or, receive serial signals and transmit RS485 signals.

5. The 4-channel RS485 expansion board based on the anti-surge technology according to claim 4, wherein the serial port expansion unit further comprises a USB expansion serial port module; the USB extended serial port module comprises an ESD protection device; the serial port interface of the XR21V1414 chip is connected with the ESD protection device through a board connector CON 2x 4.

6. The 4-channel RS485 expansion board based on the anti-surge technology according to claim 1, wherein the first stage of the RS485 communication unit output is a first self-recovery fuse and a first TVS diode combination circuit; and the second stage output by the RS485 communication unit is a GDT gas discharge tube.

7. The 4-channel RS485 expansion board based on the anti-surge technology according to claim 4, wherein the type of the digital isolator is Si 8622; and the RS485 communication unit adopts a WS3085 chip.

8. The 4-channel RS485 expansion board based on the anti-surge technology according to claim 7, wherein a first TX pin and a first RX pin of the XR21V1414 chip are connected to a VIB pin and a VOA pin of a Si8622 digital isolator respectively; the VIA pin of the Si8622 digital isolator is connected with the RO pin of the WS3085 chip; a VOB pin of the Si8622 digital isolator is connected with a base electrode of the triode; the emitting electrode of the triode is grounded; and the collector of the triode is simultaneously connected with the RE pin and the DE pin of the WS3085 chip.

9. The 4-channel RS485 expansion board based on the anti-surge technology of claim 8, wherein the collector of the triode is further connected with a pull-up resistor.