CN216956722U

CN216956722U - Reinforced intelligent multi-channel digital transmitter

Info

Publication number: CN216956722U
Application number: CN202123450467.0U
Authority: CN
Inventors: 张瑞; 姜学亮
Original assignee: Wuhan Siwei Xungu Technology Co ltd
Current assignee: Wuhan Siwei Xungu Technology Co ltd
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2022-07-12
Anticipated expiration: 2031-12-31

Abstract

The utility model belongs to the technical field of transmitters and discloses a reinforced intelligent multi-channel digital transmitter.A PCB (printed circuit board) is fixed on the inner side of a reinforced shell, and 2 paths of CAN (controller area network) interfaces, 3 paths of RS485 interfaces and 6 paths of 4-20mA analog quantity output interfaces are integrated on the outer side of the PCB; in order to meet the requirements of miniaturization and high integration of the multi-channel intelligent transmitter, two CAN transceiving interfaces and 3 RS485 serial communication interfaces are integrated by a single chip, 6 analog quantity outputs are realized by a DAC chip, and the integration level is high; two way CAN interfaces support 1Mbps transmission communication rate to the maximum, CAN be used for dual redundant CAN networks, ensure the reliability of data receiving and dispatching, also CAN be applied to different CAN networks respectively, improve equipment's utilization ratio, and the use mode is nimble changeable, different scene needs of adaptation that CAN be fine.

Description

Reinforced intelligent multi-channel digital transmitter

Technical Field

The utility model belongs to the technical field of transmitters, and particularly relates to a reinforced intelligent multi-channel digital transmitter.

Background

At present, a transmitter is an indispensable important component of a modern measurement and control system, and has the main function of converting a series of variables such as pressure, temperature, voltage, current, active power, reactive power and the like into standard signals and then sending the converted signals to a relevant unit for display or control. According to the national unified standard, the transmitter generally outputs currents of 4-20mA, 0-20mA and 4-24mA to the outside.

The conventional transmitter mainly outputs the conversion result by analog quantity. With the development of information technology and computer technology, modern transmitters are developing toward miniaturization, intelligence and multi-functionalization. Intelligent transmitters have also emerged. Intelligent transmitters are the product of a combination of sensor technology and embedded technology, and are an important component of current automated instrumentation. On the basis of the traditional transmitter, the data processing capability of the single chip microcomputer is utilized to process data from the sensor, such as conditioning measurement signals, data correction, data compensation, data display and the like. The single chip microcomputer serves as a core processing unit of the intelligent transmitter, and can complete tasks which cannot be completed by a traditional transmitter by realizing various software and hardware functions. However, the existing digital transmitter is not miniaturized and integrated, and is easily affected by severe environments such as external impact, external strong electromagnetic environment, high salt fog, strong corrosion and the like, so that the service life is shortened.

Through the above analysis, the problems and defects of the prior art are as follows:

the existing digital transmitter is not sufficient in miniaturization and integration level, is easily influenced by severe environments such as external impact, external strong electromagnetic environment, high salt fog, strong corrosion and the like, and is shortened in service life.

SUMMERY OF THE UTILITY MODEL

Aiming at the problems in the prior art, the utility model provides a reinforced intelligent multi-channel digital transmitter.

The utility model is realized in this way, a reinforced intelligent multi-channel digital transmitter is provided with:

a reinforced housing;

a PCB is fixed on the inner side of the reinforced shell, and 2 paths of CAN interfaces, 3 paths of RS485 interfaces and 6 paths of 4-20mA analog quantity output interfaces are externally provided on the outer side of the PCB;

a main chip adopted by the reinforced intelligent multi-channel digital transmitter externally provides two paths of CAN controllers and 3 paths of serial port controllers;

the main chip is connected with a DAC conversion chip, and the DAC conversion chip is connected with 6 analog quantity output interfaces.

Furthermore, the main chip selected by the board card is connected with the norflash module through the SPI interface.

Further, a CAN isolation transceiver is connected between the CAN interfaces, and an RS485 isolation transceiver is connected between the serial port controller and the RS485 interface.

Furthermore, the analog output interface outputs current of 4-20 mA.

Furthermore, an active high-precision signal conditioning module is connected between the DAC conversion chip and the analog output interface.

Furthermore, the board power supply is connected with a power protection and isolation filter, and the input voltage is reduced from 24V to 3.3V through two times of DC/DC conversion.

By combining all the technical schemes, the utility model has the advantages and positive effects that:

in order to meet the requirements of miniaturization and high integration of the multi-channel intelligent transmitter, the utility model integrates two CAN transceiving interfaces and 3 RS485 serial communication interfaces by adopting a single chip, realizes 6 analog quantity outputs by a DAC chip and has very high design integration level. Two paths of CAN interfaces support 1Mbps transmission communication rate to the maximum. The method CAN be used for a dual-redundancy CAN network, and ensures the reliability of data receiving and transmitting. The CAN network switching method CAN be applied to different CAN networks respectively, improves the utilization rate of equipment, is flexible and changeable in use mode, and CAN well adapt to different scene requirements. The 3-path RS485 interface is the same as the CAN interface and CAN support the communication rate of 1Mbps at the highest. The RS485 interface is simple to use, the communication modes of the equipment CAN be further enriched, and the practical application variety CAN be matched with the CAN communication interface for use and CAN also be independently used. The utility model uses the high-reliability chip which can work at the temperature of between 85 ℃ and 45 ℃ below zero as the serial port controller. Adopt reinforcement type shell to protect PCB board and device, prevent that equipment from because adverse circumstances such as external shock, outside strong electromagnetic environment, high salt fog, strong corrosion from causing the influence to equipment operation and life-span. The hardware and software of the product both adopt home-made devices, and the home-made rate is 90%.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained from the drawings without creative efforts.

FIG. 1 is a schematic diagram of a ruggedized intelligent multi-channel digital transmitter according to an embodiment of the present invention.

FIG. 2 is a circuit diagram of a GD32F450ZK type microprocessor provided in an embodiment of the present invention.

Fig. 3 is a circuit diagram of an ACM2520 type common mode filter according to an embodiment of the present invention.

Fig. 4 is a circuit diagram of a TD301MCAN type CAN/CAN fd isolated transceiver module according to an embodiment of the present invention.

Fig. 5 is a circuit diagram of an AD5363 dac according to an embodiment of the present invention.

Fig. 6 is a circuit diagram of a TF5134N type active high-precision output type signal conditioning module according to an embodiment of the present invention.

Fig. 7 is a circuit diagram of a GD25Q128CSIGR type norflash device according to an embodiment of the present invention.

FIG. 8 is a schematic diagram of an application of a ruggedized intelligent multi-channel digital transmitter in accordance with an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

In view of the problems in the prior art, the present invention provides a reinforced intelligent multi-channel digital transmitter, which is described in detail below with reference to the accompanying drawings.

As shown in fig. 1, the reinforced intelligent multi-channel digital transmitter provided in the embodiment of the present invention is provided with a reinforced housing; a PCB is fixed on the inner side of the reinforced shell, and 2 paths of CAN interfaces, 3 paths of RS485 interfaces and 6 paths of 4-20mA analog quantity output interfaces are externally provided on the outer side of the PCB;

The main chip in the embodiment of the utility model is connected with a norflash module.

In the embodiment of the utility model, a CAN isolation transceiver is connected between CAN interfaces, and an RS485 isolation transceiver is connected between a serial port controller and an RS485 interface.

The analog output interface in the embodiment of the utility model adopts 4-20mA current output.

An active high-precision signal conditioning module is connected between the DAC conversion chip and the analog output interface in the embodiment of the utility model.

In the embodiment of the utility model, the serial port controller and the DC/DC converter are connected with an isolation filter, and the outer end of the isolation filter is connected with a power supply protector.

As shown in FIG. 2, the embodiment of the present invention employs a GD32F450ZK type microprocessor, which is easily produced by the domestic chip manufacturer. The GD32F450ZK type microprocessor adopts an ARM architecture, a core-M4 kernel, the highest main frequency can reach 200Mhz, and a chip is provided with 512kb internal flash and 246kb internal SRAM. The interface richly contains a series of resources such as a 6-path serial port controller, a 2-path network port controller, a 3-path SPI controller, a 2-path can controller and the like. The packaging of the highest 144 paths of I/O pins can realize the selective multiplexing among different functions, so that the hardware design is more flexible. And various program programming and debugging modes such as JTAG, SWD, serial ports and the like are also provided, so that the software development process is simplified, the software development efficiency is improved, and the program upgrading is facilitated.

As shown in fig. 3, the ACM2520 common mode filter according to the embodiment of the present invention has a significantly small size, and the impedance to common mode noise is 1000 Ω. Since the differential mode impedance is suppressed to a low level, there is little effect on high-speed signals. The ruggedized intelligent multichannel digital transmitter uses the ACM2520 to cancel common mode noise of the high speed differential signal lines.

FIG. 4 is a TD301MCAN type CAN/CANFD isolated transceiver module. The module is small in size, and is a CAN bus transceiver module integrating power isolation, signal isolation, a CAN transceiver and bus protection. The reinforced intelligent multi-channel digital transmitter converts TTL level sent by the CAN controller into differential level of the CAN bus by using the module, thereby realizing signal isolation. The module is provided with an isolation power supply, and can realize electrical isolation of 2500 VDC.

Fig. 5 is an AD5363 eight channel 16/14bit voltage output digital-to-analog converter capable of providing a buffered voltage output range of 4 times the reference voltage. The gain and offset of each DAC can be independently adjusted to eliminate use errors. The 8 DAC channels are divided into two groups, and the output range of each group can be adjusted through the offset DAC. AD5363 can provide a wide voltage operating range of VSS from-4.5V to-16.5V, VDD from +8V to + 16.5V. Has SPI, QSPI \ MICROWIRE and DSP interfaces, and can process the all-time speed up to 50 Mhz. The reinforced intelligent multi-channel digital transmitter uses the module to provide input voltage for a subsequent signal conditioning module, and then the signal conditioning module proportionally outputs 4-20mA current according to the input voltage.

Fig. 6 shows a TF5134N active high-precision output type signal conditioning module, which is an active isolation module for inputting a voltage signal at a front stage and outputting a voltage/current signal at a rear stage, and a high-efficiency micropower power supply is embedded in the module, and can supply power to an internal signal processing circuit and output an isolation power supply to peripheral circuits at the same time. The reinforced intelligent multi-channel digital transmitter designs an external zero point and a full-scale adjusting end for the module, and ensures that equipment can generate accurate and stable 4-20mA current.

FIG. 7 shows a GD25Q128CSIGR type norflash, which is produced by a national manufacturer in a manner that is innovative. Compared with nandflash, the norflash has higher reliability, basically does not generate bit flipping, and is suitable for storing critical data. The GD25Q128CSIGR has the storage capacity of 128Mbit, supports reading and writing of an SPI interface, has the highest transmission rate of 532Mbits/s, and has the cyclic erasing and writing life of 10 ten thousand times.

As shown in fig. 8, two CAN interfaces of the ruggedized intelligent multichannel digital transmitter CAN be connected to different CAN networks, respectively, to receive data from the CANs, for example: voltage, current, speed, power, etc. And information such as voltage, current, rotating speed, power and the like CAN be transmitted to other equipment through the RS485 interface, so that the communication interface and protocol conversion from CAN to 485 CAN be realized. And data received from the CAN network CAN be converted into 4-20mA current to be output, so that the function of displaying and outputting the instrument is realized.

The embodiment of the utility model can adopt an MS-RTOS domestic real-time operating system, and MS-RTOS (micro Safe RTOS) is a new generation small intelligent Internet of things operating system which is designed by Nanjing winged glow information and faces to the requirements of future Internet of things and intelligent equipment.

In order to meet the requirements of miniaturization and high integration of the multi-channel intelligent transmitter, the utility model adopts a single chip to integrate two CAN transceiving interfaces and 3 RS485 serial communication interfaces, and realizes 6 analog quantity outputs through a DAC chip, thereby having very high design integration level. Two paths of CAN interfaces support 1Mbps transmission communication rate to the maximum. The method CAN be used for a dual-redundancy CAN network to ensure the reliability of data receiving and transmitting. The CAN network switching method CAN be applied to different CAN networks respectively, improves the utilization rate of equipment, is flexible and changeable in use mode, and CAN well meet the requirements of different scenes. The 3-path RS485 interface and the CAN interface are the same and CAN support the highest 1Mbps communication rate. The RS485 interface is simple to use, CAN further enrich the communication modes of the equipment, CAN be matched with the CAN communication interface in actual use, and CAN also be independently used. A high-reliability chip capable of working at +85 ℃ to-45 ℃ is used as a serial port controller. Adopt reinforcement type shell to protect PCB board and device, prevent that equipment from because adverse circumstances such as external shock, outside strong electromagnetic environment, high salt fog, strong corrosion from causing the influence to equipment operation and life-span. The hardware part of the product adopts home-made components to the maximum extent, and the home-made rate of the components is 90 percent. The software adopts an MS-RTOS real-time operating system developed by Nanjing winged glow information as an application software development platform.

The above description is only for the purpose of illustrating the present invention and the appended claims are not to be construed as limiting the scope of the utility model, which is intended to cover all modifications, equivalents and improvements that are within the spirit and scope of the utility model as defined by the appended claims.

Claims

1. The utility model provides a reinforcement type intelligence multichannel digital transmitter which characterized in that, reinforcement type intelligence multichannel digital transmitter is provided with:

a reinforced housing;

2. The ruggedized intelligent multi-channel digital transmitter of claim 1, wherein a primary chip selected for the board card is connected to the norflash module through an SPI interface.

3. The ruggedized intelligent multi-channel digital transmitter of claim 1, wherein a CAN isolation transceiver is coupled between the CAN interfaces, and an RS485 isolation transceiver is coupled between the serial controller and the RS485 interface.

4. The ruggedized intelligent multi-channel digital transmitter of claim 1, wherein the analog output interface utilizes a 4-20mA current output.

5. The ruggedized intelligent multi-channel digital transmitter of claim 1, wherein an active high-precision signal conditioning module is connected between the DAC conversion chip and the analog output interface.

6. The ruggedized intelligent multi-channel digital transmitter of claim 1, wherein the board power supply is connected to a power protection and isolation filter and the input voltage is reduced from 24 volts to 3.3 volts by two DC/DC conversions.