Wireless conversion and transmission module for analog quantity current signal

Abstract

The invention relates to the technical field of industrial field instrument signal acquisition and transmission, and provides a wireless conversion and transmission module for analog quantity current signals, which comprises a current signal input acquisition module, a digital-to-analog conversion module, a wireless transceiver module and a power supply module. Through a module which can be connected in series into a transmitter loop, in-situ detection process quantity is converted into digital quantity, and the digital quantity is transmitted and used through a wireless network. According to the invention, an external power supply is not needed, and module power supply and normal work can be realized only through transmitter loop monitoring signals.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial field instrument signal acquisition and transmission, and in particular to a wireless conversion and transmission module for analog current signals. Background Art

[0002] With the rapid development of 5G technology, 5G has made new improvements compared to 4G not only in speed but also in power consumption, latency and other aspects, making the Internet move from mobile Internet to the era of smart Internet.

[0003] There are a large number of analog sensors for monitoring and control at industrial sites. In the past, 4-20mADC standard current signals were transmitted to the control center through signal cables, and then digitized by processors for display and control. With the development of 5G technology, humans have entered the era of the Internet of Everything, and 5G technology will also be applied to industrial control sites. The 4-20mADC standard current signal generated by the analog sensor is digitized on the sensor side, and the signal is transmitted to the control center or other equipment using wireless WIFi technology. On the one hand, a large number of signal cables used for long-distance transmission can be saved, and on the other hand, the measurement signal can be used for more purposes. Summary of the invention

[0004] The purpose of the present invention is to provide a wireless conversion and transmission module for analog current signals, which can conveniently convert standard analog signals into digital signals for transmission and use in 5G networks.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A wireless conversion and transmission module for analog current signals, comprising: a current signal input acquisition module, used to convert the current signal into a voltage signal; a digital-to-analog conversion module, used to receive the voltage signal output by the current signal input acquisition module and convert it into a digital signal for output; and a wireless transceiver module, used to receive the digital signal output by the digital-to-analog conversion module and perform wireless signal transmission with a control center.

[0007] Furthermore, the wireless conversion and transmission module also includes a power supply module for supplying power to the digital-to-analog conversion module and the wireless transceiver module.

[0008] Furthermore, the power module is electrically connected to the transmitter, and the transmitter outputs a current in the range of 4 to 20 mA direct current.

[0009] Furthermore, the power module obtains a voltage range by connecting a resistor in series with the transmitter output loop.

[0010] Furthermore, the current signal input acquisition module is connected in series to the transmitter output loop, and is converted into a voltage signal proportional to the input current through the current signal input acquisition module.

[0011] Furthermore, the digital-to-analog conversion module sends the digital signal to the wireless transceiver module using serial transmission.

[0012] Furthermore, the wireless transceiver module uses the ZigBee communication transmission protocol to perform wireless signal transmission with the control center, and transmits the real-time monitoring values ​​of the process variables to the control center.

[0013] Furthermore, the wireless transceiver module is infrared IR, radio frequency RF or Bluetooth Bluetooth.

[0014] Furthermore, the wireless transceiver module performs wireless signal transmission with other devices.

[0015] Furthermore, the wireless transceiver module uses the ZigBee communication transmission protocol to perform wireless signal transmission with other devices, and transmits the real-time monitoring values ​​of the process variables to other devices.

[0016] Compared with the prior art, the wireless conversion and transmission module for analog current signals provided by the present invention has the following beneficial effects:

[0017] The present invention converts the local detection process quantity into a digital quantity and transmits and uses it through a wireless network without changing the normal operation of the current transmitter. The present invention does not require an external power supply, and the module can be powered and operate normally only through the transmitter loop monitoring signal.

[0018] The present invention adds a wireless network communication function to an existing transmitter with a wireless network communication function, and the process variable can be directly monitored through the wireless network.

[0019] The present invention enables industrial field instruments to perform wireless communication without changing the original design structure, thereby avoiding the need to re-purchase instruments with wireless communication functions due to the addition of wireless communication functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for the technical description.

[0021] Figure 1 A schematic diagram of a wireless conversion and transmission module for analog current signals provided by the present invention. DETAILED DESCRIPTION

[0022] The following is further explained in detail through specific implementation methods.

[0023] like Figure 1 As shown, the present invention provides a wireless conversion and transmission module for analog current signals, which includes a current signal input acquisition module, a power module, a digital-to-analog conversion module, and a wireless transceiver module. The wireless conversion and transmission module can be connected in series to the current output loop of the analog transmitter in the industrial field, and the current signal is converted into a digital quantity through the digital-to-analog conversion module. The digital quantity is transmitted to the control center through the wireless transceiver module using a wireless network. At the same time, the wireless conversion and transmission module does not require external power supply, and only the power converted from the working current of the transmitter can drive each chip to work.

[0024] The current signal input acquisition module is used to convert the current signal into a voltage signal. The current signal input acquisition module is connected in series with the transmitter output circuit. Within the allowable impedance range, it does not affect the normal operation of the transmitter. Under normal circumstances, the transmitter output range is 4-20mA DC current, which can be converted into a voltage signal proportional to the input current through the current signal input acquisition module.

[0025] The digital-to-analog conversion module is used to receive the voltage signal output by the current signal input acquisition module and convert it into a digital signal output. The voltage signal output by the current signal input acquisition module is proportional to the current signal. The voltage signal is converted into a digital engineering quantity by the digital-to-analog conversion module, and then combined with the range of the process quantity detected by the transmitter, the actual value of the on-site process variable is calculated.

[0026] The wireless transceiver module is used to receive the digital signal output by the digital-to-analog conversion module and transmit the wireless signal to the control center or other devices (for example, the control center server, mobile phones / tablets / mobile controllers and other mobile devices). The digital-to-analog conversion module uses serial transmission to send the digital signal to the wireless transceiver module, and the wireless transceiver module uses the ZigBee communication transmission protocol (infrared IR, radio frequency RF or Bluetooth can also be used as a wireless transmission module) to transmit the wireless signal to the control center or other devices, and transmit the real-time monitoring value of the process variables to the control center or other devices.

[0027] The power module is used to power the digital-to-analog conversion module and the wireless transceiver module. The power module mainly obtains a voltage range by connecting a resistor in series with the transmitter output loop. Under normal circumstances, the transmitter output current I ranges from 4 to 20mADC, then the output voltage of the power module is U=I*R, where R is the size of the series resistor. This voltage range is sufficient to drive the data conversion module and the wireless transceiver module to work normally.

[0028] For the field transmitter instrument, the present invention connects the current signal input module in series to the transmitter signal output loop, and the input current in the wireless transmission module of the analog current signal is the output signal monitored by the transmitter. Under normal circumstances, its output range is 4-20mA direct current. The direct current is converted into a proportional voltage signal by the current signal input module and output to the digital-to-analog conversion module. The digital-to-analog conversion module converts the voltage signal into a digital engineering quantity, and then combines the range of the process detected by the transmitter to convert it into a field process quantity through calculation. The digital process quantity is input to the wireless transceiver module. The wireless transceiver module is connected to the control center or other equipment through a wireless protocol, receives and sends signals, and transmits the digital process quantity to the control center or other equipment. At the same time, the wireless conversion and transmission module of the analog current signal does not require external power input. The output signal of the common transmitter is in the range of 3.8-30mADC. The wireless conversion and transmission module of the analog current signal is designed to include a power module, which can drive the digital-to-analog conversion module and the wireless transceiver module to work normally through a small current (0.1-30mADC).

[0029] The present invention converts the standard 4-20mADC current signal of the industrial field instrument into a digital quantity through an analog-to-digital conversion chip, and transmits it through a network through a wireless chip, so as to be used for system monitoring and control.

[0030] The present invention does not require modification of the existing monitoring transmitter, and only requires serial connection into the transmitter loop to realize analog quantity digitization and transmit the monitoring quantity into the wireless network.

[0031] The present invention does not require an external power supply and can achieve normal operation of the module only through monitoring signals of the transmitter loop.

[0032] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A wireless conversion and transmission module for analog current signals, characterized in that: include: A current signal input acquisition module is used to convert the current signal into a voltage signal; A digital-to-analog conversion module is used to receive the voltage signal output by the current signal input acquisition module and convert it into a digital signal output; The wireless transceiver module is used to receive the digital signal output by the digital-to-analog conversion module and transmit the wireless signal to the control center.

2. The wireless conversion and transmission module for analog current signals according to claim 1, characterized in that: The wireless conversion and transmission module also includes a power supply module for supplying power to the digital-to-analog conversion module and the wireless transceiver module.

3. The wireless conversion and transmission module for analog current signals according to claim 2, characterized in that: The power module is electrically connected to the transmitter, and the transmitter outputs a 4-20 mA direct current.

4. The wireless conversion and transmission module for analog current signals according to claim 3, characterized in that: The power module obtains a voltage range by connecting a resistor in series with the transmitter output loop.

5. The wireless conversion and transmission module for analog current signals according to claim 1, characterized in that: The current signal input acquisition module is connected in series to the transmitter output loop, and is converted into a voltage signal proportional to the input current through the current signal input acquisition module.

6. The wireless conversion and transmission module for analog current signals according to claim 1, characterized in that: The digital-to-analog conversion module uses serial transmission to send the digital signal to the wireless transceiver module.

7. The wireless conversion and transmission module for analog current signals according to claim 6, characterized in that: The wireless transceiver module uses the ZigBee communication transmission protocol to transmit wireless signals to the control center, and transmits the real-time monitoring values ​​of the process variables to the control center.

8. The wireless conversion and transmission module for analog current signals according to claim 6, characterized in that: The wireless transceiver module is an infrared module, a radio frequency module or Bluetooth.

9. The wireless conversion and transmission module for analog current signals according to claim 1, characterized in that: The wireless transceiver module performs wireless signal transmission with the control center server or mobile device.

10. The wireless conversion and transmission module for analog current signals according to claim 9, characterized in that: The wireless transceiver module uses the ZigBee communication transmission protocol to transmit wireless signals to the control center server or mobile device, and transmits the real-time monitoring values ​​of the process variables to the control center server or mobile device.

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