CN216083455U

CN216083455U - Millivolt signal digital transmitter

Info

Publication number: CN216083455U
Application number: CN202122340124.2U
Authority: CN
Inventors: 高振铭; 孙维亚; 邬俊杰; 康政; 张洪涛; 侯辉亮; 程鸿帅; 杨喆; 茹兴康; 陆通; 袁雨明
Original assignee: South To North Water Transfer Middle Route Information Technology Co ltd
Current assignee: South To North Water Transfer Middle Route Information Technology Co ltd
Priority date: 2021-09-26
Filing date: 2021-09-26
Publication date: 2022-03-18
Anticipated expiration: 2031-09-26

Abstract

The utility model relates to a millivolt signal digital transmitter, which comprises an AD acquisition chip, a CPU, a DA output chip, a voltage-to-current module, an RS422 communication chip and a USB serial port communication chip, wherein the AD acquisition chip is connected with the CPU; the CPU is respectively connected with the AD acquisition chip, the DA output chip, the RS422 communication chip and the USB serial port communication chip; the voltage-to-current module is connected with the DA output chip; the DA output chip can output a voltage signal; the voltage-to-current module can output a current signal; the RS422 communication chip and the USB serial port communication chip can output digital signals. After the CPU processes the received signals, the voltage signals can be directly output through the DA output chip, the voltage signals can also be output to the voltage-to-current conversion module through the DA output chip, the current signals are output by the voltage-to-current conversion module to be used in an industrial field, and digital signals can also be output outwards through the USB serial port communication chip and the RS422 communication chip, so that the types of the signals which can be output are effectively increased.

Description

Millivolt signal digital transmitter

Technical Field

The utility model relates to the technical field of transmitters, in particular to a millivolt signal digital transmitter.

Background

Two-way millivolt signal digital transmitters are used in many specialty applications. These sites include earthquake command and dispatch sites, seismic testing sites, and hydraulic systems, among others. It can transmit signals from a long distance so as to realize remote monitoring.

However, the existing millivolt signal digital transmitter outputs a single signal type, and has a small application range.

SUMMERY OF THE UTILITY MODEL

The utility model provides a millivolt signal digital transmitter, aiming at solving the problems of single type of signal output and small application range of the existing millivolt signal digital transmitter.

The millivolt signal digital transmitter provided for realizing the purpose of the utility model comprises an AD acquisition chip, a CPU, a DA output chip, a voltage-to-current module, an RS422 communication chip and a USB serial port communication chip;

the CPU is respectively connected with the AD acquisition chip, the DA output chip, the RS422 communication chip and the USB serial port communication chip;

the voltage-to-current module is connected with the DA output chip;

the DA output chip can output a voltage signal; the voltage-to-current module can output a current signal; the RS422 communication chip and the USB serial port communication chip can output digital signals;

a CS pin of the AD acquisition chip is connected with a PA4 pin of the CPU, a SCLK pin is connected with a PA1 pin of the CPU, a DIN pin is connected with a PA14 pin of the CPU, a DOUT pin is connected with a PA13 pin of the CPU, and a DRDY pin is connected with a PA12 pin of the CPU;

the YNC pin of the DA output chip is connected with a PB6 pin of the CPU, the SCLK pin is connected with a PB7 pin of the CPU, the DIN pin is connected with a PB8 pin of the CPU, the VoutA pin is connected with the voltage-to-current module, and the VoutB pin is connected with the voltage-to-current module;

the RXD pin of the RS422 communication chip is connected with the PA3 pin of the CPU, and the TXD pin is connected with the PA2 pin of the CPU;

the RXD pin of the USB serial port communication chip is connected with the PA9 pin of the CPU, and the TXD pin is connected with the PA10 pin of the CPU.

In one specific embodiment, the device further comprises a reference voltage chip;

the reference voltage chip is respectively connected with a REFIN + pin of the AD acquisition chip and a REFIN-pin of the AD acquisition chip.

In one specific embodiment, the system further comprises a millivolt signal interface, an RS422 communication interface, a current output interface and a USB serial port communication interface;

the millivolt signal interface is connected with the AD acquisition chip;

the RS422 communication interface is connected with the RS422 communication chip;

the current output interface is connected with the voltage-to-current module;

the USB serial port communication interface is connected with the USB serial port communication chip.

In one embodiment, the number of the millivolt signal interface, the RS422 communication interface, the current output interface and the USB serial port communication interface is more than one.

In one embodiment, the device further comprises a circuit board;

the front side of the circuit board is fixed with an AD acquisition chip, a CPU, a voltage-to-current module, a USB serial port communication chip, a millivolt signal interface, an RS422 communication interface and a current output interface, and the back side of the circuit board is fixed with an RS422 communication chip and a DA output chip.

In one specific embodiment, the LED lamp also comprises an LED indicator light;

the LED indicator light is connected with the CPU.

In one specific embodiment, the system further comprises a power supply module;

the power supply module is respectively connected with the AD acquisition chip, the CPU, the DA output chip, the voltage-to-current conversion module, the RS422 communication chip and the USB serial port communication chip.

In one embodiment, the power supply module comprises an isolated power circuit and a linear power circuit;

the isolated power circuit is electrically connected with the linear power circuit.

In one embodiment, the CPU comprises a CPU chip and a memory module;

the CPU chip is connected with the storage module.

The utility model has the beneficial effects that: according to the millivolt signal digital transmitter, the AD acquisition chip is arranged, millivolt signals can be acquired, filtering setting is carried out, the millivolt signals are transmitted to the CPU, the CPU processes the received signals, voltage signals can be directly output through the DA output chip, the voltage signals can also be output to the voltage-to-current module through the DA output chip, the voltage-to-current module outputs current signals for industrial field use, digital signals can also be output outwards through the USB serial port communication chip and the RS422 communication chip, and the types of the signals which can be output are effectively increased. In addition, the RS422 communication chip can receive original signal information and input a double-differential signal to the CPU, so that the anti-interference capability is strong, remote parameters can be corrected on site, and the upper computer software is supported to adjust the parameters to control the measuring range. Compared with the existing transmitter, the range can be conveniently adjusted, the problem that the influence range of the sliding rheostat is deviated due to the influence of vibration is solved, and the data are more accurate. On the whole, the compatibility of the millivolt signal digital transmitter is effectively improved, the application range of the millivolt signal digital transmitter is expanded, and the installation and the maintenance are more convenient.

Drawings

FIG. 1 is a schematic diagram of the operation of one embodiment of a millivolt signal digital transmitter of the present invention;

FIG. 2 is a circuit diagram of one embodiment of a millivolt signal digital transmitter of the present invention;

FIG. 3 is a circuit diagram of a CPU in the millivolt signal digital transmitter shown in FIG. 2;

FIG. 4 is a circuit diagram of an AD acquisition chip in the millivolt signal digital transmitter shown in FIG. 2;

FIG. 5 is a circuit diagram of a DA output chip in the millivolt signal digital transmitter shown in FIG. 2;

FIG. 6 is a circuit diagram of a voltage to current module in the millivolt signal digital transmitter of FIG. 2;

FIG. 7 is a circuit diagram of an RS422 communication chip in the millivolt signal digital transmitter of FIG. 2;

FIG. 8 is a circuit diagram of a USB serial communication chip in the millivolt signal digital transmitter of FIG. 2;

FIG. 9 is a circuit diagram of a reference voltage chip in the millivolt signal digital transmitter of FIG. 2;

FIG. 10 is a circuit diagram of an isolated power chip of the power module in the millivolt signal digital transmitter of FIG. 2;

FIG. 11 is a circuit diagram of a linear power chip of the power module in the millivolt signal digital transmitter shown in FIG. 2;

FIG. 12 is a schematic diagram of a front view of one embodiment of a millivolt signal digital transmitter of the present invention;

fig. 13 is a back side schematic view of the millivolt signal digital transmitter of fig. 12.

Detailed Description

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 only a part of the embodiments of the present invention, and not all of the embodiments.

Examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.

In the description of the present invention, it is to be understood that the terms "top," "bottom," "inner," "outer," "axial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention or for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise specifically stated or limited, the terms "mounted," "connected," "secured," "engaged," "hinged," and the like are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other suitable relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Referring to fig. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 and 13, the millivolt signal digital transmitter includes an AD acquisition chip 110, a CPU120, a DA output chip 130, a voltage-to-current module 140, an RS422 communication chip 150 and a USB serial port communication chip 160. The CPU120 is connected to the AD acquisition chip 110, the DA output chip 130, the RS422 communication chip 150, and the USB serial communication chip 160, respectively. The voltage-to-current module 140 is connected to the DA output chip 130. The DA output chip 130 can output a voltage signal, the voltage-to-current module 140 can output a current signal, and the RS422 communication chip 150 and the USB serial port communication chip 160 can output a digital signal.

In this embodiment, the AD acquisition chip 110 can acquire millivolt signals, perform filtering and setting and transmit the millivolt signals to the CPU120, the CPU120 can directly output 0-5V or 0-10V voltage signals through the DA output chip 130 after processing the received signals, or output the voltage signals to the voltage-to-current module 140 through the DA output chip 130, the voltage-to-current module 140 outputs 4mA-20mA current signals for industrial field use, or output digital signals to the outside through the USB serial communication chip 160 and the RS422 communication chip 150, so that the types of the signals that can be output are effectively increased. In addition, the RS422 communication chip 150 can receive original signal information and input a double differential signal to the CPU120, so that the anti-interference capability is strong, remote parameters can be corrected on site, and the upper computer software is supported to adjust the parameters to control the measuring range. Compared with the existing transmitter, the range can be conveniently adjusted, the problem that the influence range of the sliding rheostat is deviated due to the influence of vibration is solved, and the data are more accurate. On the whole, the compatibility of the millivolt signal digital transmitter is effectively improved, the application range of the millivolt signal digital transmitter is expanded, and the installation and the maintenance are more convenient. Moreover, the real-time state of the millivolt signal digital transmitter can be read through the USB serial port communication chip 160 and the RS422 communication chip 150, and relevant parameter configuration can be performed on the device, so that an operator can conveniently and efficiently complete debugging, configuration and subsequent work tasks.

Specifically, the CS pin of the AD acquisition chip 110 is connected to the PA4 pin of the CPU120, the SCLK pin is connected to the PA5 pin of the CPU120, the DIN pin is connected to the PA7 pin of the CPU120, the DOUT pin is connected to the PA6 pin of the CPU120, and the DRDY pin is connected to the PB12 pin of the CPU 120. The YNC pin of the DA output chip 130 is connected with the PB6 pin of the CPU120, the SCLK pin is connected with the PB7 pin of the CPU120, the DIN pin is connected with the PB8 pin of the CPU120, the VoutA pin is connected with the voltage-to-current module 140, and the VoutB pin is connected with the voltage-to-current module 140. The RXD pin of the RS422 communication chip 150 is connected to the PA3 pin of the CPU120, and the TXD pin is connected to the PA2 pin of the CPU 120. The RXD pin of the USB serial communication chip 160 is connected to the PA9 pin of the CPU120, and the TXD pin is connected to the PA10 pin of the CPU 120. The model of the RS422 communication chip 150 is ADM2682EBRIZ or others. The model of the AD acquisition chip 110 is TM7705 or others. The model of the DA output chip 130 is DAC8562SDGSR or others. The CPU120 is of model STM32F103C8T6 or otherwise. The USB serial port communication chip 160 has a model number CH340G or other.

In a specific embodiment of the present invention, the device further includes a reference voltage chip, wherein the 8 th pin of the reference voltage chip is connected to the REFIN + pin of the AD acquisition chip 110, and the 4 th pin of the reference voltage chip is connected to the REFIN-pin of the AD acquisition chip 110. The model of the reference voltage chip is LM285DR-2-5 or other. The voltage range of the AIN1+ pin of the AD acquisition chip 110 is 0-5V, and the voltage range of the AIN2+ pin is 0-5V.

In an embodiment of the present invention, the apparatus further includes a millivolt signal interface 181, an RS422 communication interface 182, a current output interface 183, a USB serial port communication interface, and a voltage output interface. The millivolt signal interface 181 is connected to the AD acquisition chip 110. The AD acquisition chip 110 acquires the mv signals through the mv signal interface 181, performs filtering and setting, and transmits the mv signals to the CPU 120. The RS422 communication interface 182 is connected to the RS422 communication chip 150. The RS422 communication chip 150 measures the original signal information through the RS422 communication interface 182, performs parameter tuning, and transmits the result to the CPU 120. And also to output digital signals to the outside through the RS422 communication interface 182. The current output interface 183 is connected to the voltage-to-current module 140. The voltage-to-current module 140 outputs a current signal to the outside through the current output interface 183. The USB serial communication interface is connected to the USB serial communication chip 160. The USB serial communication chip 160 can output digital signals to the outside through the USB serial communication interface. And, millivolt signal interface, RS422 communication interface, electric current output interface, USB serial communication interface and voltage output interface all are more than one. According to actual needs, the number of corresponding interfaces can be increased.

In a specific embodiment of the present invention, the LED lighting device further comprises a circuit board 180 and an LED lamp, wherein the front surface of the circuit board 180 is fixed with an AD acquisition chip 110, a CPU120, a voltage-to-current module 140, a USB serial port communication chip 160, a millivolt signal interface 181, an RS422 communication interface 182, and a current output interface 183, and the back surface of the circuit board 180 is fixed with an RS422 communication chip 150 and a DA output chip 130. Thus, the design of the transmitter is more compact and miniaturized. The LED indicator is fixed to the circuit board and connected to the CPU 120. Whether the whole operation of the transmitter is normal can be judged by the display color of the LED lamp, so that an operator can monitor the operation state of the transmitter conveniently.

In a specific embodiment of the present invention, the device further includes a power supply module 170, and the power supply module 170 is connected to the AD acquisition chip 110, the CPU120, the DA output chip 130, the voltage-to-current conversion module 140, the RS422 communication chip 150, and the USB serial communication chip 160, respectively. The power supply module 170 is electrically connected with an external power supply, and 9-36V direct current is input into the power supply module 170 by the external power supply. The power supply module 170 can convert the direct current input by the external power supply into a direct current of 12V, 5V, 3.3V or 1.5V for the AD acquisition chip 110, the CPU120, the DA output chip 130, the voltage-to-current conversion module 140, the RS422 communication chip 150 and the USB serial communication chip 160 to work. On the whole, the cost is reduced on the premise of ensuring a certain transmission rate. It should be noted that all the procedures requiring communication can be implemented by the existing program.

In an embodiment of the present invention, the power supply module 170 includes an isolation power circuit and a linear power circuit, and the isolation power circuit is electrically connected to the linear power circuit. The isolation power supply circuit can output 5V voltage, and the linear power supply circuit can output 3.3V voltage for different modules/chips to work and use.

In an embodiment of the present invention, the CPU120 includes a CPU chip and a memory module. The CPU chip is connected with the storage module. The storage module can store information and reduce the operating temperature of the CPU chip.

In the description herein, reference to the description of the terms "one embodiment," "some embodiments," "an example," "a specific example," "one specific embodiment," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, a schematic representation of the term does not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the scope of the present invention, and the technical solution and the concept of the present invention are equivalent to or changed within the scope of the present invention.

Claims

1. A millivolt signal digital transmitter, comprising:

the device comprises an AD acquisition chip, a CPU, a DA output chip, a voltage-to-current module, an RS422 communication chip and a USB serial port communication chip;

the voltage-to-current module is connected with the DA output chip;

a CS pin of the AD acquisition chip is connected with a PA4 pin of the CPU, an SCLK pin is connected with a PA5 pin of the CPU, a DIN pin is connected with a PA7 pin of the CPU, a DOUT pin is connected with a PA6 pin of the CPU, and a DRDY pin is connected with a PB12 pin of the CPU;

the YNC pin of the DA output chip is connected with the PB6 pin of the CPU, the SCLK pin is connected with the PB7 pin of the CPU, the DIN pin is connected with the PB8 pin of the CPU, the VoutA pin is connected with the voltage-to-current module, and the VoutB pin is connected with the voltage-to-current module;

2. The millivolt signal digital transmitter of claim 1, further comprising a reference voltage chip;

3. A millivolt signal digital transmitter as claimed in claim 1 or 2, further comprising a millivolt signal interface, an RS422 communication interface, a current output interface and a USB serial communication interface;

the millivolt signal interface is connected with the AD acquisition chip;

the current output interface is connected with the voltage-to-current module;

and the USB serial port communication interface is connected with the USB serial port communication chip.

4. A millivolt signal digital transmitter as claimed in claim 3 wherein said millivolt signal interface, said RS422 communication interface, said current output interface and said USB serial communication interface are all one or more.

5. The millivolt-signal digital transmitter of claim 3 further comprising a circuit board;

the front of circuit board is fixed with AD gathers the chip, CPU, voltage changes electric current module, USB serial communication chip, millivolt signal interface, RS422 communication interface with the electric current output interface, the back is fixed with RS422 communication chip with DA output chip.

6. The millivolt signal digital transmitter of claim 1 or 2, further comprising an LED indicator light;

the LED indicator light is connected with the CPU.

7. The millivolt-signal digital transmitter of claim 1 or 2, further comprising a power module;

8. The millivolt-signal digital transmitter of claim 7, wherein said power supply module includes an isolated power supply circuit and a linear power supply circuit;

the isolated power supply circuit is electrically connected with the linear power supply circuit.

9. The millivolt-signal digital transmitter of claim 1 or 2, wherein said CPU comprises a CPU chip and a memory module;

the CPU chip is connected with the storage module.