CN210981569U

CN210981569U - Cold end compensation design device of temperature tester

Info

Publication number: CN210981569U
Application number: CN201921844103.0U
Authority: CN
Inventors: 陈仕健; 孟桢沛; 李阳; 彭鹏
Original assignee: Shenzhen Jhd Technology Co ltd
Current assignee: Shenzhen Jhd Technology Co ltd
Priority date: 2019-10-30
Filing date: 2019-10-30
Publication date: 2020-07-10
Anticipated expiration: 2029-10-30

Abstract

The utility model discloses a cold junction compensation design device of a temperature tester, the signal processing front end is used for processing received signals, an accurate signal amplifier (OPA) is responsible for transmitting weak signals with accurate frequency expansion, the signal processing front end is electrically connected with an accurate signal amplifier (0PA), a high-precision analog-digital converter (ADC) converts continuously-changed analog signals into discrete digital signals, a cascade logic circuit realizes the transmission and processing of discrete signals and adopts the binary system as the principle to realize the logic operation and operation of digital signals, a high-precision temperature measuring sensor (TS) converts the temperature into electric quantity by utilizing the law that various physical properties of materials change along with the temperature, a functional part finishes various instructions of signal input, the functional part comprises an analog part and a digital part, the analog part finishes the pretreatment and the amplification of thermocouple temperature signals, and the cold end temperature is acquired, and the digital part is responsible for the digitization of the thermocouple array. The utility model discloses reduce volume and power consumption, reduced the fault rate simultaneously.

Description

Cold end compensation design device of temperature tester

Technical Field

The utility model relates to a temperature test recording instrument technical field particularly, relates to a temperature tester cold junction compensation design device.

Background

The current temperature test recording instrument is various in variety, various design standards are different, the design of a temperature measuring circuit adopted by various temperature test instruments determines the final temperature acquisition precision, the most critical design is the design of a cold end compensation circuit of thermoelectric even data, most manufacturers design the cold end integrally at a circuit board at present, the true cold end of a thermocouple is away from the circuit board by a certain distance, the error of temperature transmission exists, the design scheme of the thermocouple is the temperature caused by the distance, the cold end of the thermocouple is on an acquisition circuit to the maximum extent, and the acquired temperature is more accurate.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a temperature tester cold junction compensation design device to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: the cold end compensation design device of the temperature tester is characterized in that a signal processing front end, a precision signal amplifier (OPA), a high-precision analog-digital converter (ADC), a cascade logic circuit, a high-precision temperature measurement sensor (TS) and a functional part are sequentially connected.

The signal processing front end is used for processing received signals, the precision signal amplifier (OPA) is responsible for transmitting weak signals with precisely enlarged frequency, the signal processing front end is electrically connected with the precision signal amplifier (0PA), the high-precision analog-to-digital converter (ADC) is a device for converting continuously-changed analog signals into discrete digital signals, the cascade logic circuit is used for transmitting and processing the discrete signals and realizing digital signal logic operation and operation by taking binary as a principle, the high-precision temperature measuring sensor (TS) converts temperature into electric quantity by utilizing the rule that various physical properties of substances change along with the temperature, and the functional part is used for finishing various instructions of signal input.

The functional part comprises an analog part and a digital part, wherein the analog part completes the pretreatment, amplification and cold end temperature acquisition of thermocouple temperature signals, and the digital part is responsible for the digitization of thermocouple arrays, the transmission of measurement results and the reception of control instructions.

Further, the high precision analog to digital converter (ADC) and the precision signal amplifier (OPA) are located in the U2 area of the circuit board.

Further, the length of the circuit board is 19.20mm, and the width is 17.00 mm.

Furthermore, a cold end test circuit is arranged on the female seat of the thermocouple socket.

Compared with the prior art, the utility model discloses following beneficial effect has:

the design has the advantages that when the standard thermocouple interface is used, the precision of the cold end temperature measurement side of the thermocouple is improved, the temperature change response time is shortened, and therefore the precision and the dynamic response of the whole set of thermocouple acquisition system are improved. Meanwhile, the size and the power consumption of the whole set of design are reduced to the maximum extent, the connecting lines between the modules are reduced, the installation is simplified, and the potential fault probability is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic diagram of a thermocouple acquisition circuit system of a cold end compensation design device of a temperature tester;

FIG. 2 is a schematic diagram of a PCB first layer circuit board design of a cold end compensation design device of a temperature tester;

FIG. 3 is a schematic diagram of a second layer circuit board design of a PCB of a cold end compensation design device of a temperature tester;

FIG. 4 is a schematic diagram of a third layer circuit board design of a PCB of a cold end compensation design device of a temperature tester;

FIG. 5 is a schematic diagram of a fourth layer circuit board design of a PCB of a cold end compensation design device of a temperature tester.

Detailed Description

The technical solution 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 some embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the protection scope of the present invention based on the embodiments of the present invention.

In the description of the present invention, it should be noted that the terms "top", "bottom", "one side", "the other side", "front", "back", "middle part", "inside", "top", "bottom", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of description and simplification of the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1-5, a cold junction compensation design device for a temperature tester according to an embodiment of the present invention includes a signal processing front end, an accurate signal amplifier (OPA), a high-precision analog-to-digital converter (ADC), a cascade logic circuit, a high-precision Temperature Sensor (TS), and a functional portion, which are connected in sequence.

Through the above technical scheme of the utility model, high accuracy analog-to-digital converter (ADC) with precision signal amplifier (OPA) is located the U2 region of circuit board, and the length of circuit board is 19.20mm, and is wide for 17.00mm, is equipped with cold junction test circuit on the female seat of thermocouple socket, innovative with cold junction test circuit design on the female seat of thermocouple socket, do not occupy under the condition of socket volume, can set acquisition circuit in real cold junction department again, this kind of design is in installation and equipment, can avoid the assembly error that people arouse for welding thermocouple extension line etc.. .

The working principle is as follows:

the utility model discloses signal processing front end received signal and processing input precision signal amplifier (OPA), enlarge the frequency by precision signal amplifier (OPA) and convert analog signal to digital signal by high accuracy analog-to-digital converter (ADC) again, make the instruction by cascading logic circuit, input the functional unit.

In summary, the following steps: the design has the advantages that when the standard thermocouple interface is used, the precision of the cold end temperature measurement side of the thermocouple is improved, the temperature change response time is shortened, and therefore the precision and the dynamic response of the whole set of thermocouple acquisition system are improved. Meanwhile, the size and the power consumption of the whole set of design are reduced to the maximum extent, the connecting lines between the modules are reduced, the installation is simplified, and the potential fault probability is reduced.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A cold end compensation design device of a temperature tester is characterized in that a signal processing front end, a precision signal amplifier (OPA), a high-precision analog-digital converter (ADC), a cascade logic circuit, a high-precision temperature measurement sensor (TS) and a functional part are sequentially connected, the signal processing front end is used for processing received signals, the precision signal amplifier (OPA) is responsible for transmitting weak signals with precisely enlarged frequency, the signal processing front end is electrically connected with the precision signal amplifier (OPA), the high-precision analog-digital converter (ADC) converts continuously-changed analog signals into discrete digital signals, the cascade logic circuit realizes the transmission and processing of discrete signals and realizes the logic operation and operation of the digital signals by using a binary system as a principle, and the high-precision temperature measurement sensor (TS) converts temperature into electric quantity by utilizing the law that various physical properties of substances change along with the temperature, the functional part completes various instructions of signal input, the functional part comprises an analog part and a digital part, the analog part completes pretreatment, amplification and cold end temperature acquisition of thermocouple temperature signals, and the digital part is responsible for digitization, measurement result transmission and control instruction receiving of thermocouple arrays.

2. The temperature tester cold end compensation design device of claim 1, wherein the high precision analog to digital converter (ADC) and the precision signal amplifier (OPA) are located in the U2 area of the circuit board.

3. The cold end compensation design device of temperature tester as claimed in claim 1, wherein the length of circuit board is 19.20mm and the width is 17.00 mm.

4. The cold end compensation design device of the temperature tester as claimed in claim 1, wherein the female seat of the thermocouple socket is provided with a cold end test circuit.