CN110927406B

CN110927406B - On-line detection device of sensor

Info

Publication number: CN110927406B
Application number: CN201911001270.3A
Authority: CN
Inventors: 庄双勇; 李焰; 吴鹏
Original assignee: Hefei Zhimin Thermal Control Technology Co ltd
Current assignee: Hefei Zhimin Thermal Control Technology Co ltd
Priority date: 2019-10-21
Filing date: 2019-10-21
Publication date: 2022-01-04
Anticipated expiration: 2039-10-21
Also published as: CN110927406A

Abstract

The invention discloses an on-line detection device of a sensor, which comprises an analog voltage input circuit and a sensor interface circuit, wherein the sensor interface circuit comprises a power supply VCCA, an NTC sensor terminal socket, a resistor R19, an AD test terminal, an analog-to-digital converter AD0 and a capacitor C15, a terminal 2 of the NTC sensor terminal socket is connected with the power supply VCCA, a terminal 1 of the NTC sensor terminal socket is connected with the analog-to-digital converter AD0, one terminal of the analog-to-digital converter AD0 is connected with one end of the capacitor C15, the other end of the capacitor C15 is connected with one terminal of the AD test terminal, the invention can detect important components used in a circuit and various resistive sensors generating analog voltage at any time through related circuits and software, greatly improves the reliability of the circuits, and a controller can timely find and perform corresponding processing under the fault condition, the method has important significance for safe operation of related circuits of the controller and timely feedback to the previous layer of control.

Description

On-line detection device of sensor

Technical Field

The invention relates to a monitoring device, in particular to an on-line detection device of a sensor, and belongs to the technical field of sensor application.

Background

The sensor is a detection device, can feel the measured information, and can convert the felt information into an electric signal or other information output in a required form according to a certain rule so as to meet the requirements of information transmission, processing, storage, display, recording, control and the like, and the sensor is characterized by comprising: the system is mainly used for realizing automatic detection and automatic control. The existence and development of the sensor enable the object to have the senses of touch, taste, smell and the like, and the object slowly becomes alive. Generally, the sensor is classified into ten categories, i.e., a thermosensitive element, a photosensitive element, a gas-sensitive element, a force-sensitive element, a magnetic-sensitive element, a humidity-sensitive element, a sound-sensitive element, a radiation-sensitive element, a color-sensitive element, and a taste-sensitive element, according to their basic sensing functions.

The sensor on-line measuring device that current patent grant publication number is CN203929802U, this sensor on-line measuring device, the microcontroller terminal has realized the on-line measuring of sensor after each process is accomplished, the digitization and the visualization of microcontroller terminal testing result, the microcontroller terminal realizes that this sensor on-line measuring device has with low costs, microcontroller terminal range of application is wide, microcontroller terminal qualification rate, the characteristics that microcontroller terminal production efficiency and test accuracy are high, however, this sensor on-line measuring device can't solve sensor circuit damage or sensor body has the problem, will return the error signal, and the controller can not distinguish, lead to serious problem or serious consequence, for this reason, we propose the on-line measuring device of a sensor.

Disclosure of Invention

The technical problem solved by the invention is as follows:

(1) how to make the supply power VCCA have different expected voltages through the control of the microcontroller terminals A1 and A2 and the adjustment of the data of the resistor, and then the AD test terminal is suspended, so that the AD1 is in the condition that the related circuits and elements are normal, and different expected voltage bits are generated, and the microcontroller and the related circuits can judge whether the related circuits and elements are normal or not by detecting the voltage bits, thereby solving the problem that the prior art is difficult to detect the state of the sensor at any time when the circuits work normally, ensuring the normal work of the sensor and the related circuits, and returning effective field data.

The purpose of the invention can be realized by the following technical scheme: the on-line detection device of the sensor comprises an analog voltage input circuit and a sensor interface circuit;

the sensor interface circuit comprises a power supply VCCA, an NTC sensor terminal socket, a resistor R19, an AD test terminal, an analog-to-digital converter AD0 and a capacitor C15, wherein a2 terminal of the NTC sensor terminal socket is connected with the power supply VCCA, a1 terminal of the NTC sensor terminal socket is connected with the analog-to-digital converter AD0, one terminal of the analog-to-digital converter AD0 is connected with one end of a capacitor C15, the other end of the capacitor C15 is connected with one terminal of the AD test terminal, one terminal of the resistor R19 is connected with the NTC sensor terminal socket, and the other terminal of the resistor R19 is connected with the AD test terminal;

analog voltage input circuit includes positive end VCC of power supply, power supply VCCA, microcontroller terminal A2, microcontroller terminal A1, resistance R1, resistance R2, resistance R3 and earth connection GND, power supply VCCA's terminal is connected with 1 wiring and 2 wiring of PNP output respectively, 1 wiring and the 1 wiring of positive end VCC of power supply of PNP output are connected, and 1 wiring and resistance R1's one end of PNP output are connected, resistance R1's the other end is connected with microcontroller terminal A1, 2 wiring and the microcontroller terminal A2 of PNP output are connected, 2 wiring of PNP output is connected with resistance R2 and resistance R3's one end respectively, the other end and the 2 wiring of the positive end VCC of power supply of resistance R2 are connected, the other end and the earth connection of resistance R3 are connected.

The invention has further technical improvements that: the analog-to-digital converter AD0 is internally connected with a chip for analyzing voltage signals.

The invention has further technical improvements that: the AD test terminal is connected with the control I O terminal, and can be grounded or suspended through IO control.

The invention has further technical improvements that: and the NTC sensor terminal socket is externally connected with a simulation temperature sensor.

Compared with the prior art, the invention has the beneficial effects that:

the external analog temperature sensor of NTC sensor terminal socket, AD1 internal connection analytic voltage signal's chip, VCCA can be connected to multiple driving voltage through the switching, AD test terminal connection control IO terminal, through I O steerable ground connection or unsettled, through relevant circuit and software, accomplish to detect at any time the important components and parts that use in the circuit and various resistive sensor that produce analog voltage, improve the reliability of circuit greatly, under the trouble condition, the controller in time discovers and does corresponding the processing, it has the significance to the relevant circuit of controller safe operation and to the timely feedback of last layer control.

Drawings

In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.

FIG. 1 is a circuit diagram of a sensor interface according to the present invention;

FIG. 2 is a circuit diagram of a microcontroller according to the present invention;

FIG. 3 is a circuit diagram of an analog voltage input circuit according to the present invention.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-3, an on-line detection device for a sensor includes an analog voltage input circuit and a sensor interface circuit;

The analog-to-digital converter AD0 is internally connected with a chip for analyzing voltage signals.

The AD test terminal is connected with the control I O terminal, and can be grounded or suspended through IO control.

And the NTC sensor terminal socket is externally connected with a simulation temperature sensor.

According to the invention, the NTC sensor terminal socket is externally connected with an analog temperature sensor, the AD1 is internally connected with a chip for analyzing voltage signals, the VCCA can be connected to various driving voltages through switching, the AD test terminal is connected with the control I O terminal, the grounding or suspension can be controlled through I O, and the detection of important components used in the circuit and various resistive sensors generating analog voltages at any time is realized through related circuits and software, so that the reliability of the circuit is greatly improved.

The working principle is as follows: when the invention is used, firstly, a power supply VCCA is connected with the voltage of an AD power supply of an analog-digital converter, an AD test terminal is grounded through IO control, when the temperature changes, the resistance of the analog temperature sensor changes, the voltage of an AD1 terminal changes, a controller analyzes the changed voltage signal to calculate the corresponding temperature for testing, the power supply VCCA and the AD test terminal can be controlled, wherein the AD test terminal is directly connected with a S0 pin of a controller in a circuit, the AD test terminal can be controlled to be suspended or grounded through the S0 pin, different voltage values can be generated by the controller, the controllers A2 and A1 can be combined to control the output voltage of the VCCA, a certain determined voltage value can be generated at the AD1 terminal part, namely, a low level 0, a high level VCC or a voltage range expected by circuit design is generated at an AD1 point, the controller can determine whether related circuits and elements work normally through the detection and judgment of the voltage value, different voltages of a supply power VCCA can be caused to appear different voltages in expectation by the control of terminals A1 and A2 of a microcontroller and the adjustment of data of a resistor, then an AD test terminal is suspended, an AD1 is in the condition that related circuits and elements are normal to generate different expected voltage bits, the microcontroller and the related circuits can judge whether the related circuits and the elements are normal or not by detecting the voltage bits, wherein the VCCA can also disconnect the voltage by the controller and generate a VCCA level of 0 by utilizing the grounding of the microcontroller by matching with the AD test terminal, meanwhile, if a temperature sensor has short circuit, disconnection of a connecting wire, burnout or other damage conditions in the real environment, the voltage value can be abnormal and inconsistent with the expectation, and the controller can monitor the working condition of the related circuits of the temperature sampling test at any time by the acquisition and judgment of the voltage, whether the related circuits and components work normally is judged, and if the related circuits and components work abnormally, corresponding processing is carried out in time, so that adverse consequences caused by misjudgment are avoided.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. An on-line measuring device of sensor which characterized in that: the sensor comprises an analog voltage input circuit and a sensor interface circuit;

the analog voltage input circuit comprises a power supply positive terminal VCC, a power supply VCCA, a microcontroller terminal A2, a microcontroller terminal A1, a resistor R1, a resistor R2, a resistor R3 and a ground wire GND, wherein the terminals of the power supply VCCA are respectively connected with a terminal 1 and a terminal 2 of PNP output, the terminal 1 of the PNP output is connected with the terminal 1 of the power supply positive terminal VCC, the terminal 1 of the PNP output is connected with one end of a resistor R1, the other end of the resistor R1 is connected with the microcontroller terminal A1, the terminal 2 of the PNP output is connected with the microcontroller terminal A2, the terminal 2 of the PNP output is respectively connected with one ends of a resistor R2 and a resistor R3, the other end of the resistor R2 is connected with the terminal 2 of the power supply positive terminal VCC, and the other end of the resistor R3 is connected with the ground wire;

the AD test terminal is connected with the control IO terminal and can be grounded or suspended through IO control.

2. The on-line detection device of a sensor according to claim 1, wherein the analog-to-digital converter AD0 is internally connected with a chip for analyzing the voltage signal.

3. The on-line detecting device of a sensor according to claim 1, wherein the NTC sensor terminal socket is externally connected with an analog temperature sensor.