CN205426376U - Long -range wireless programme -controlled intelligent temperature transmitter - Google Patents

Abstract

The utility model discloses a long -range wireless programme -controlled intelligent temperature transmitter, include: a signal acquisition equipment, signal acquisition equipment is used for gathering temperature signal, and will temperature signal converts data signal into and carries to microprocessor, a microprocessor used for judging and reading, microprocessor be used for with data signal converts temperature data, current data and voltage signal into, and will temperature data reaches current data conveys the equipment to wireless communication, a wireless communication equipment, wireless communication equipment be used for with temperature data reaches current data carries out wireless transmission and gives the main control computer, a power, the power is used for providing the electric energy. The utility model provides a pair of long -range wireless programme -controlled intelligent temperature transmitter, whole circuit design is succinct, the precision is higher, stability is good, has solved the problem and the loaded down with trivial details problem of range adjustment of changer and main control computer wireless communication distance.

Description

Remote wireless program-controlled intelligent temperature transmitter

technical field

The invention relates to the technical field of industrial temperature measurement, in particular to a remote wireless program-controlled intelligent temperature transmitter.

Background technique

In industrial production, temperature measurement plays a very important role. At the same time, industrial wireless technology is an important part of the future development of industry. It is a revolutionary technology that reduces the cost of industrial control systems and improves the application range of industrial control systems. It is also a new growth point for industrial automation products. . Therefore, the combination of wireless technology and intelligent temperature transmitter must have certain practical value and application prospect.

At present, there are also wireless temperature transmitters based on the EEE802.15.4 standard low-power LAN protocol (hereinafter referred to as ZigBee) technology, but the ZigBee technology has a short transmission distance and is not suitable for long-distance data transmission. At the same time, in the past, the range adjustment of intelligent temperature transmitters mostly used the replacement of resistors in the hardware circuit, which was cumbersome to operate and brought a lot of inconvenience to debugging.

Contents of the invention

The embodiment of the present application solves the problem in the prior art that industrial temperature measurement cannot be communicated in a long distance by providing a remote wireless program-controlled intelligent temperature transmitter.

The embodiment of the present application provides a remote wireless program-controlled intelligent temperature transmitter, including:

A signal acquisition device, the signal acquisition device is used to collect the temperature signal, and convert the temperature signal into a digital signal and send it to the microprocessor;

A microprocessor, the microprocessor is used to convert the digital signal into temperature data, current data and voltage signal, and transmit the temperature data and the current data to the wireless communication device;

A wireless communication device, the wireless communication device is used to wirelessly transmit the temperature data and the current data to the main control machine;

A power supply, the power supply is used to provide electric energy for the signal acquisition device, the microprocessor and the wireless communication device.

Further, the signal acquisition device includes:

A thermal resistance, the thermal resistance is used to detect the temperature signal, and send the temperature signal to the signal conditioning device;

A signal conditioning device, the signal conditioning device is used to convert the received temperature signal into a voltage signal, and deliver the voltage signal to an analog-to-digital converter;

An analog-to-digital converter, the analog-to-digital converter is used to convert the received voltage signal into a digital signal, and send the digital signal to the microprocessor.

Further, the signal conditioning device includes:

A single-arm electric bridge, the single-arm electric bridge is used to convert the received temperature signal into a voltage signal, and send the voltage signal to a program-controlled amplifier;

A program-controlled amplifier, the program-controlled amplifier is used to amplify the received voltage signal, and then deliver the amplified voltage signal to the analog-to-digital converter.

Further, the microprocessor includes:

An arithmetic unit, the arithmetic unit is used to calculate the received voltage signal to obtain the temperature data and the current data;

A digital-to-analog converter, the digital-to-analog converter is used to convert the received voltage signal into voltage data.

Further, the wireless communication device includes:

A 3G communication module, the 3G communication module is used to receive the temperature data and the current data output by the microprocessor, and remotely and wirelessly transmit the temperature data and the current data to the main control machine.

Further, the remote wireless program-controlled intelligent temperature transmitter also includes:

A liquid crystal display device, the liquid crystal display device is used to display the temperature data and the current data output by the microprocessor in real time.

Further, the remote wireless program-controlled intelligent temperature transmitter also includes:

A current converter, the current converter is used to convert the voltage signal output by the microprocessor into a current signal.

Further, the thermal resistance adopts a platinum thermal resistance with an accuracy of 0.1.

Further, the temperature detection medium of the thermal resistance includes liquid, gas and steam.

Further, the current data is equal to the current value in the current signal.

One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages: due to the use of wireless communication equipment and the use of wireless communication networks, it effectively solves the problem that the intelligent temperature transmitter in the prior art cannot remotely wirelessly real-time The problem of online data transmission, and then realized the remote wireless communication between the intelligent temperature transmitter and the main control machine.

Description of drawings

Fig. 1 is a schematic structural diagram of a remote wireless program-controlled intelligent temperature transmitter in Embodiment 1 of the present application;

FIG. 2 is a structural diagram of a remote wireless program-controlled intelligent temperature transmitter in Embodiment 2 of the present application;

Fig. 3 is the thermal resistance temperature measuring circuit diagram in the utility model embodiment three;

Fig. 4 is the signal conditioning circuit diagram in the utility model embodiment three;

Fig. 5 is the analog-to-digital conversion circuit diagram in the third embodiment of the utility model;

Fig. 6 is the current conversion circuit diagram in the third embodiment of the utility model;

Fig. 7 is a 3G communication circuit diagram in Embodiment 3 of the present invention.

detailed description

The remote wireless program-controlled intelligent temperature transmitter provided by the utility model can realize the adjustable measuring range only by modifying some parameters of the program, and has the advantage of remote real-time wireless transmission of data at the same time. The entire circuit has simple design, high precision, and good stability, which solves the problem of the wireless communication distance between the transmitter and the main control machine and the cumbersome problem of range adjustment.

In order to better understand the above-mentioned technical solution, the above-mentioned technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

Embodiment one

As shown in Figure 1, a remote wireless program-controlled intelligent temperature transmitter provided by the embodiment of the utility model includes: a signal acquisition device 1, a microprocessor 2, a wireless communication device 3 and a power supply 4, and the signal acquisition device 1 is used for Collect the temperature signal, convert the temperature signal into a digital signal and send it to the microprocessor 2; the microprocessor 2 is used to convert the digital signal into temperature data, current data and voltage signal, and send the temperature data and current data to The wireless communication device 3; the wireless communication device 3 is used to wirelessly transmit temperature data and current data to the main control machine; the power supply 4 is used to provide electric energy for the signal acquisition device 1, the microprocessor 2 and the wireless communication device 3.

Among them, the signal acquisition device 1 includes: a thermal resistance, a signal conditioning device and an analog-to-digital converter. The thermal resistance is used to detect the temperature signal and transmit the temperature signal to the signal conditioning device; the thermal resistance adopts a platinum thermal resistance with an accuracy of 0.1 . The medium for temperature detection by thermal resistance includes liquid, gas and steam. The signal conditioning device is used to convert the received temperature signal into a voltage signal, and send the voltage signal to the analog-to-digital converter; the analog-to-digital converter is used to convert the received voltage signal into a digital signal, and send the digital signal to the micro processor.

The signal conditioning device includes: a single-arm electric bridge and a program-controlled amplifier, the single-arm electric bridge is used to convert the received temperature signal into a voltage signal, and sends the voltage signal to the program-controlled amplifier; the program-controlled amplifier is used to process the received voltage signal After amplification, the amplified voltage signal is sent to an analog-to-digital converter.

The microprocessor 2 includes: an arithmetic unit and a digital-to-analog converter, the arithmetic unit is used for calculating the received voltage signal to obtain temperature data and current data; the digital-analog converter is used for converting the received voltage signal into voltage data.

Embodiment two

As shown in Figure 2, a remote wireless program-controlled intelligent temperature transmitter provided by the embodiment of the present invention includes: signal acquisition equipment 1, microprocessor 2, wireless communication equipment 3, power supply 4, liquid crystal display equipment and current conversion The signal acquisition device 1 is used to collect the temperature signal, and converts the temperature signal into a digital signal and sends it to the microprocessor 2; the microprocessor 2 is used to convert the digital signal into temperature data, current data and voltage signal, and The temperature data and current data are transmitted to the wireless communication device 3; the wireless communication device 3 is used to wirelessly transmit the temperature data and current data to the main controller; the power supply 4 is used to provide electric energy for the remote wireless program-controlled intelligent temperature transmitter. The liquid crystal display device is used to display the temperature data and current data output by the microprocessor 2 in real time. The current converter is used to convert the voltage signal output by the microprocessor 2 into a current signal. The current data is equal to the current value in the current signal.

Among them, the signal acquisition device 1 includes: a thermal resistance, a signal conditioning device and an analog-to-digital converter. The thermal resistance is used to detect the temperature signal and transmit the temperature signal to the signal conditioning device; the thermal resistance adopts a platinum thermal resistance with an accuracy of 0.1 . The medium for temperature detection by thermal resistance includes liquid, gas and steam. The signal conditioning device is used to convert the received temperature signal into a voltage signal, and send the voltage signal to the analog-to-digital converter; the analog-to-digital converter is used to convert the received voltage signal into a digital signal, and send the digital signal to the micro processor.

The signal conditioning device includes: a single-arm electric bridge and a program-controlled amplifier, the single-arm electric bridge is used to convert the received temperature signal into a voltage signal, and sends the voltage signal to the program-controlled amplifier; the program-controlled amplifier is used to process the received voltage signal After amplification, the amplified voltage signal is sent to an analog-to-digital converter.

The microprocessor 2 includes: an arithmetic unit and a digital-to-analog converter, the arithmetic unit is used for calculating the received voltage signal to obtain temperature data and current data; the digital-analog converter is used for converting the received voltage signal into voltage data.

The wireless communication device 3 includes: a 3G communication module, the 3G communication module is used to receive the temperature data and current data output by the microprocessor 2, and transmit the temperature data and current data to the main control machine remotely and wirelessly.

Embodiment three

The practical remote wireless program-controlled intelligent temperature transmitter mainly includes a thermal resistance 5, a signal conditioning device 6, an analog-to-digital converter 7, a microprocessor 2, a liquid crystal display device 8, a current converter 9, a 3G wireless communication device 10, and a power supply 4 .

In the embodiment of the present application, the thermal resistor 5 adopts a thermal resistor PT100 with a precision of 0.1, and the three-wire PT100 is directly connected to the signal conditioning device 6 . It can detect the temperature of liquid, gas, steam and other media.

The signal conditioning device 6 is connected to the thermal resistance 5. The signal conditioning device 6 is mainly composed of a single-arm bridge and a program-controlled amplifier PGA281. The single-arm bridge can convert it into a voltage signal according to the size of the input signal, and the program-controlled amplifier can be controlled by a program to amplify The multiple of the voltage signal is better for the analog-to-digital converter to convert. Among them, the thermal resistance temperature measurement circuit is shown in Figure 3, which is composed of a voltage follower composed of an operational amplifier ADA4528 and a single-arm bridge. The accuracy of the 2.5V reference source will affect the accuracy of the system, and the voltage follower can well overcome the influence of the subsequent circuit. The single-arm bridge converts the weak resistance change of PT100 into voltage change, which is better utilized by the system. The signal conditioning circuit is shown in Figure 4, mainly composed of the program-controlled amplifier PGA281. The microprocessor performs program control to adjust the system magnification, which solves the problem of inconvenient range adjustment of temperature transmitters in the past.

The analog-to-digital converter 7 adopts the chip AD7705 to connect with the signal conditioning device 6, collects the voltage signal output by the analog-to-digital converter 7 and converts it to output a digital signal. The analog-to-digital conversion circuit is shown in Figure 5, mainly composed of the analog-to-digital converter AD7705. This converter utilizes Conversion technology achieves 16-bit no missing code performance. The CMOS structure ensures that the device has extremely low power consumption. The power-down mode reduces the power consumption during standby to 20uW. By applying clipping stabilization technology at the input stage, the AD7705 also has low input drift. Performance, can process 0-+5V single-ended signal, very suitable for this system.

The microprocessor 2 is connected with the analog-to-digital converter 7 by using a single-chip microcomputer STM32F103RCT6, receives the digital signal output by the analog-to-digital converter 7, and processes it for use by subsequent modules. Including: calculating the temperature data and current data, using the internal digital-to-analog converter DAC to output the corresponding voltage data.

The liquid crystal display device 8 adopts an industrial liquid crystal screen LCD1602 connected with the microprocessor 2, receives digital signal input from the microprocessor 2, and displays temperature data and output current data in real time.

The current converter 9 is connected with the microprocessor 2, accepts the voltage signal input of the microprocessor 2, uses a single operational amplifier to follow the output voltage to act on the fixed value resistor, and outputs the corresponding standard current signal. The current conversion circuit is shown in Figure 6, which is mainly composed of the operational amplifier ADA4528 and the transistor 9013. Transistor S9013 can improve the output current capability of the system. The voltage output by the single-chip microcomputer is equivalent to directly acting on R23 through the virtual short characteristic of the op amp, and V2/R23 is the current output by the transmitter.

The 3G wireless communication device 10 mainly uses Huawei MU509 to connect with the microprocessor 2, utilizes the communication function of the 3G module, receives digital signal input from the microprocessor 2, and remotely wirelessly transmits temperature data and output current data to the main control machine. The 3G communication circuit is shown in Figure 7, which mainly consists of a voltage conversion chip MAX3232 and a 3G module. MAX3232 converts the TTL level output by the microprocessor into the RS232 level that the 3G module can receive.

The power supply 4 is responsible for providing energy to the system, which can be powered by mains power or batteries, but after power conditioning, the power supply system has excellent characteristics such as large current output and low interference.

One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

1. Due to the adoption of the 3G communication module, through the 3G wireless communication technology, the problem that the intelligent temperature transmitter cannot transmit data remotely, wirelessly and online in real time is effectively solved in the prior art, and then the intelligent temperature transmitter and the main control machine can be realized. Remote wireless communication.

2. Since the program-controlled amplifier is used in the signal acquisition equipment, the problem of inconvenient range adjustment of the intelligent temperature transmitter in the prior art is effectively solved, and the convenient range adjustment of the intelligent temperature transmitter is realized.

Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present utility model without limitation. Although the utility model has been described in detail with reference to examples, those of ordinary skill in the art should understand that the utility model can be Modifications or equivalent replacements of the technical solutions without departing from the spirit and scope of the technical solutions of the utility model shall be covered by the claims of the utility model.

Claims (8)

1. a long distance wireless program-controlled intelligent temperature transmitter, it is characterised in that including:

One signal collecting device, described signal collecting device is for being acquired temperature signal, and described temperature signal is converted to digital signal is delivered to microprocessor；

One microprocessor, described microprocessor for being converted to temperature data, current data and voltage signal by described digital signal, and described temperature data and described current data are sent to wireless telecommunications system；

One wireless telecommunications system, described wireless telecommunications system is for carrying out radioing to main control computer by described temperature data and described current data；

One power supply, described power supply is for providing electric energy for described signal collecting device, described microprocessor and described wireless telecommunications system;

Wherein, described signal collecting device includes: a thermal resistance, and described thermal resistance is for detecting temperature signal, and described temperature signal is delivered to signal regulating device；

One signal regulating device, described signal regulating device is for being converted into voltage signal by the described temperature signal received, and described voltage signal is delivered to analog-digital converter；

One analog-digital converter, described analog-digital converter is for being converted into digital signal by the described voltage signal received, and described digital signal is delivered to described microprocessor；

Described signal regulating device includes:

One wheatstone bridge, described wheatstone bridge is for being converted into voltage signal by the described temperature signal received, and described voltage signal is delivered to programmable amplifier；

One programmable amplifier, described programmable amplifier is after be amplified the described voltage signal received, the more described voltage signal after amplifying is delivered to described analog-digital converter.

2. long distance wireless program-controlled intelligent temperature transmitter as claimed in claim 1, it is characterised in that described microprocessor includes:

One arithmetical unit, described arithmetical unit obtains described temperature data and described current data for the voltage signal received carries out computing；

One digital analog converter, described digital analog converter is for being converted into voltage data by the described voltage signal received.

3. long distance wireless program-controlled intelligent temperature transmitter as claimed in claim 1, it is characterised in that described wireless telecommunications system includes:

One 3G communication module, described 3G communication module is for receiving the described temperature data of described microprocessor output and described current data, and by described temperature data and described current data long range radio transmissions to main control computer.

4. long distance wireless program-controlled intelligent temperature transmitter as claimed in claim 1, it is characterised in that also include:

One liquid crystal display, described liquid crystal display shows the described temperature data of described microprocessor output and described current data in real time.

5. the long distance wireless program-controlled intelligent temperature transmitter as described in any one of claim 1-4, it is characterised in that also include:

One power pack, described power pack is for being converted to current signal by the described voltage signal that microprocessor exports.

6. long distance wireless program-controlled intelligent temperature transmitter as claimed in claim 1, it is characterised in that:

Described thermal resistance uses precision to be the platinum resistance thermometer sensor, of 0.1.

7. long distance wireless program-controlled intelligent temperature transmitter as claimed in claim 1, it is characterised in that:

Described thermal resistance carries out the medium of temperature detection and includes liquid, gas and steam.

8. long distance wireless program-controlled intelligent temperature transmitter as claimed in claim 5, it is characterised in that:

Described current data is equal with the current value in described current signal.