阅读说明：本技术 变频器温度传感器异常检测方法、变频器及存储介质 (Frequency converter temperature sensor abnormality detection method, frequency converter and storage medium ) 是由 骆鹏 陶旭东 于 2019-10-15 设计创作，主要内容包括：本发明提供了一种变频器温度传感器异常检测方法,应用于变频器,变频器内设有温度传感器,温度传感器用于检测变频器内部的温度,方法包括：判断变频器是否运行；若变频器运行,则获取温度传感器实时检测到的实际温度值；判断实际温度值是否小于或等于预设的第一温度值；若实际温度值小于或等于第一温度值,则判断实际温度值小于或等于第一温度值的实际持续时长是否大于或等于理论持续时长,理论持续时长为根据变频器的实时输出电流确定的；若实际持续时长大于或等于理论持续时长,则判定温度传感器为异常,从而检测出变频器内的温度传感器是否异常。(The invention provides a method for detecting abnormity of a temperature sensor of a frequency converter, which is applied to the frequency converter, wherein the frequency converter is internally provided with the temperature sensor, and the temperature sensor is used for detecting the temperature inside the frequency converter, and the method comprises the following steps: judging whether the frequency converter operates or not; if the frequency converter runs, acquiring an actual temperature value detected by the temperature sensor in real time; judging whether the actual temperature value is less than or equal to a preset first temperature value or not; if the actual temperature value is less than or equal to the first temperature value, judging whether the actual duration of the actual temperature value which is less than or equal to the first temperature value is greater than or equal to the theoretical duration, wherein the theoretical duration is determined according to the real-time output current of the frequency converter; and if the actual duration is greater than or equal to the theoretical duration, judging that the temperature sensor is abnormal, and detecting whether the temperature sensor in the frequency converter is abnormal.)

1. A method for detecting abnormality of a temperature sensor of a frequency converter is characterized in that the method is applied to the frequency converter, the frequency converter is internally provided with the temperature sensor, the temperature sensor is used for detecting the temperature inside the frequency converter,

the method comprises the following steps:

judging whether the frequency converter operates or not;

if the frequency converter operates, acquiring an actual temperature value detected by the temperature sensor in real time;

judging whether the actual temperature value is less than or equal to a preset first temperature value or not;

if the actual temperature value is less than or equal to the first temperature value, judging whether the actual duration of the actual temperature value which is less than or equal to the first temperature value is greater than or equal to a theoretical duration, wherein the theoretical duration is determined according to the real-time output current of the frequency converter;

and if the actual duration is greater than or equal to the theoretical duration, determining that the temperature sensor is abnormal.

2. The method of claim 1, further comprising:

respectively acquiring temperature values of the starting time and the ending time of the current period detected by the temperature sensor;

calculating the absolute value of the difference between the temperature value at the starting moment and the temperature value at the ending moment;

judging whether the absolute value of the difference value of the temperature values is greater than or equal to a preset second temperature value or not;

and if the absolute value of the difference value of the temperature values is greater than or equal to the second temperature value and the actual duration is less than the theoretical duration, determining that the temperature sensor is abnormal.

3. The method according to claim 1 or 2, wherein after determining that the temperature sensor is abnormal, the method further comprises:

and controlling the frequency converter to stop outputting.

4. The method according to claim 1 or 2, wherein after determining that the temperature sensor is abnormal, the method further comprises:

and controlling the frequency converter to output an alarm signal for prompting that the temperature sensor is abnormal.

5. The method of claim 1, wherein determining that the temperature sensor is abnormal if the actual duration is greater than or equal to the theoretical duration comprises:

and judging that the temperature sensor is abnormal before the frequency converter operates.

6. The method of claim 2, wherein if the absolute value of the difference between the temperature values is greater than or equal to the second temperature value and the actual duration is less than the theoretical duration, determining that the temperature sensor is abnormal comprises:

and judging that the temperature sensor is abnormal in the running process of the frequency converter.

7. The method according to claim 2, wherein the obtaining of the actual temperature value detected by the temperature sensor in real time is performed if the absolute value of the difference between the temperature values is smaller than the second temperature value.

8. The utility model provides a frequency converter, its characterized in that, is including the temperature sensor and the main control chip that are connected, temperature sensor locates the inside of frequency converter is used for detecting the inside temperature of frequency converter, main control chip is used for:

judging whether the frequency converter operates or not;

if the frequency converter operates, acquiring an actual temperature value detected by the temperature sensor in real time;

judging whether the actual temperature value is less than or equal to a preset first temperature value or not;

if the actual temperature value is less than or equal to the first temperature value, judging whether the actual duration of the actual temperature value which is less than or equal to the first temperature value is greater than or equal to a theoretical duration, wherein the theoretical duration is determined according to the real-time output current of the frequency converter;

and if the actual duration is greater than or equal to the theoretical duration, determining that the temperature sensor is abnormal.

9. The frequency converter of claim 8, wherein the master control chip is further configured to:

respectively acquiring temperature values of the starting time and the ending time of the current period detected by the temperature sensor;

calculating the absolute value of the difference between the temperature value at the starting moment and the temperature value at the ending moment;

judging whether the absolute value of the difference value of the temperature values is greater than or equal to a preset second temperature value or not;

and if the absolute value of the difference value of the temperature values is greater than or equal to the second temperature value and the actual duration is less than the theoretical duration, determining that the temperature sensor is abnormal.

10. A computer-readable storage medium, characterized in that the computer storage medium stores a computer program which, when executed by a processor, implements the method of any one of claims 1-7.

Technical Field

The invention relates to the technical field of frequency converters, in particular to a frequency converter temperature sensor abnormity detection method, a frequency converter and a storage medium.

Background

A Variable-frequency Drive (VFD) is a power control device that controls an ac motor by changing the frequency of the operating power supply of the motor. With the continuous improvement of the industrial automation degree, the frequency converter is also widely applied. The importance of the role played by the frequency converter is more and more prominent, and therefore, the security of the frequency converter is more and more important.

The inside of converter is mainly some electronic components, and the long-time power-on operation of converter, inside electronic components can generate heat. Therefore, a temperature sensor is usually disposed inside the frequency converter for detecting the temperature inside the frequency converter, so as to facilitate the frequency converter to perform temperature control management.

If the temperature sensor in the frequency converter is damaged, the frequency converter cannot acquire the correct internal temperature, so that over-temperature protection cannot be timely performed, and finally the frequency converter is damaged or even explodes.

Disclosure of Invention

The invention mainly aims to provide an inverter temperature sensor abnormality detection method, an inverter and a storage medium, which can detect whether a temperature sensor is abnormal or not.

In order to achieve the above technical problem, an embodiment of the present invention provides an abnormality detection method for a temperature sensor of a frequency converter, which is applied to the frequency converter, wherein a temperature sensor is arranged in the frequency converter, the temperature sensor is used for detecting the temperature inside the frequency converter,

the method comprises the following steps:

judging whether the frequency converter operates or not;

if the frequency converter operates, acquiring an actual temperature value detected by the temperature sensor in real time;

judging whether the actual temperature value is less than or equal to a preset first temperature value or not;

if the actual temperature value is less than or equal to the first temperature value, judging whether the actual duration of the actual temperature value which is less than or equal to the first temperature value is greater than or equal to a theoretical duration, wherein the theoretical duration is determined according to the real-time output current of the frequency converter;

and if the actual duration is greater than or equal to the theoretical duration, determining that the temperature sensor is abnormal.

In one embodiment, the method further comprises:

respectively acquiring temperature values of the starting time and the ending time of the current period detected by the temperature sensor;

calculating the absolute value of the difference between the temperature value at the starting moment and the temperature value at the ending moment;

judging whether the absolute value of the difference value of the temperature values is greater than or equal to a preset second temperature value or not;

and if the absolute value of the difference value of the temperature values is greater than or equal to the second temperature value and the actual duration is less than the theoretical duration, determining that the temperature sensor is abnormal.

In one embodiment, after determining that the temperature sensor is abnormal, the method further comprises:

and controlling the frequency converter to stop outputting.

In one embodiment, after determining that the temperature sensor is abnormal, the method further comprises:

and controlling the frequency converter to output an alarm signal for prompting that the temperature sensor is abnormal.

In one embodiment, if the actual duration is greater than or equal to the theoretical duration, determining that the temperature sensor is abnormal includes:

and judging that the temperature sensor is abnormal before the frequency converter operates.

In one embodiment, if the absolute value of the difference between the temperature values is greater than or equal to the second temperature value and the actual duration is less than the theoretical duration, determining that the temperature sensor is abnormal includes:

and judging that the temperature sensor is abnormal in the running process of the frequency converter.

In an embodiment, if the absolute value of the difference between the temperature values is smaller than the second temperature value, the obtaining of the actual temperature value detected by the temperature sensor in real time is performed.

The embodiment of the invention also provides a frequency converter, which comprises a temperature sensor and a main control chip which are connected, wherein the temperature sensor is arranged in the frequency converter and is used for detecting the temperature in the frequency converter, and the main control chip is used for:

judging whether the frequency converter operates or not;

if the frequency converter operates, acquiring an actual temperature value detected by the temperature sensor in real time;

judging whether the actual temperature value is less than or equal to a preset first temperature value or not;

if the actual temperature value is less than or equal to the first temperature value, judging whether the actual duration of the actual temperature value which is less than or equal to the first temperature value is greater than or equal to a theoretical duration, wherein the theoretical duration is determined according to the real-time output current of the frequency converter;

and if the actual duration is greater than or equal to the theoretical duration, determining that the temperature sensor is abnormal.

In one embodiment, the main control chip is further configured to:

respectively acquiring temperature values of the starting time and the ending time of the current period detected by the temperature sensor;

calculating the absolute value of the difference between the temperature value at the starting moment and the temperature value at the ending moment;

judging whether the absolute value of the difference value of the temperature values is greater than or equal to a preset second temperature value or not;

and if the absolute value of the difference value of the temperature values is greater than or equal to the second temperature value and the actual duration is less than the theoretical duration, determining that the temperature sensor is abnormal.

An embodiment of the invention provides a computer-readable storage medium, in which a computer program is stored, which, when being executed by a processor, carries out the method according to any one of the above embodiments.

The invention has the beneficial effects that:

the invention provides a method for detecting the abnormity of a temperature sensor of a frequency converter, which comprises the steps of judging whether the frequency converter operates or not; if the frequency converter runs, acquiring an actual temperature value detected by the temperature sensor in real time; judging whether the actual temperature value is less than or equal to a preset first temperature value or not; if the actual temperature value is less than or equal to the first temperature value, judging whether the actual duration of the actual temperature value which is less than or equal to the first temperature value is greater than or equal to the theoretical duration, wherein the theoretical duration is determined according to the real-time output current of the frequency converter; and if the actual duration is greater than or equal to the theoretical duration, judging that the temperature sensor is abnormal, and detecting whether the temperature sensor in the frequency converter is abnormal.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

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

Fig. 1 is a schematic structural diagram of a frequency converter according to an embodiment of the present invention;

fig. 2 is a flowchart of an abnormality detection method for a temperature sensor of a frequency converter according to an embodiment of the present invention;

fig. 3 is a flowchart of an abnormality detection method for a temperature sensor of an inverter according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all 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 application.

Referring to fig. 1 and fig. 2, an embodiment of the invention provides a method for detecting an abnormality of a temperature sensor 10 of a frequency converter, which is applied to the frequency converter, the frequency converter is provided with the temperature sensor 10, and the temperature sensor 10 is used for detecting the temperature inside the frequency converter.

An abnormality may occur in the temperature sensor 10, and the abnormal state of the temperature sensor 10 may be damage, disconnection, poor contact, or the like. The temperature sensor 10 is normally abnormal before or during the operation of the frequency converter.

If the temperature sensor 10 is abnormal before the frequency converter operates, the temperature value obtained by the frequency converter through the temperature sensor 10 is kept unchanged. If the temperature sensor 10 is abnormal in the operation process of the frequency converter, the temperature value obtained by the frequency converter through the temperature sensor 10 jumps.

The method for detecting the abnormality of the frequency converter temperature sensor 10 provided by the embodiment of the invention is based on the principle. Specifically, the method for detecting an abnormality of the frequency converter temperature sensor 10 provided in the embodiment of the present invention specifically includes the following steps:

and step 100, judging whether the frequency converter operates, and if so, turning to step 110.

Step 110, obtaining an actual temperature value detected by the temperature sensor 10 in real time.

Step 120, determining whether the actual temperature value is less than or equal to a preset first temperature value.

If the actual temperature value is less than or equal to the first temperature value, go to step 130.

Step 130, judging whether the actual duration of the actual temperature value less than or equal to the first temperature value is greater than or equal to the theoretical duration, wherein the theoretical duration is determined according to the real-time output current of the frequency converter.

If the actual duration is greater than or equal to the theoretical duration, proceed to step 140.

In step 140, it is determined that the temperature sensor 10 is abnormal.

The detection principle of the method for detecting the abnormality of the frequency converter temperature sensor 10 provided by the embodiment of the invention is as follows:

if the temperature sensor 10 is abnormal before operation, the temperature value obtained by the frequency converter through the temperature sensor 10 will remain unchanged. If the temperature value obtained by the frequency converter from the temperature sensor 10 is always smaller than the preset first temperature value, the frequency converter continuously judges whether the temperature value is always smaller than the preset first temperature value, namely, whether the actual duration of the actual temperature value smaller than or equal to the first temperature value is larger than or equal to the theoretical duration, wherein the theoretical duration is determined according to the real-time output current of the frequency converter.

The larger the output current of the frequency converter is, the faster the temperature rise speed of the frequency converter is caused, that is, the shorter the theoretical duration time during which the temperature is kept unchanged is, that is, the output current of the frequency converter and the theoretical duration time are in a certain relationship. That is, by obtaining the output current of the frequency converter, the corresponding theoretical duration can be found according to the relationship, and then the actual duration of the actual temperature value less than or equal to the first temperature value is compared with the theoretical duration, so as to determine whether the actual duration of the actual temperature value less than or equal to the first temperature value is greater than or equal to the theoretical duration. If the value is greater than or equal to the predetermined value, it indicates that the temperature sensor 10 is abnormal, and the abnormality of the temperature sensor 10 can be detected.

The method for detecting the abnormality of the frequency converter temperature sensor 10 provided by the embodiment of the invention comprises the steps of judging whether the frequency converter operates, and if the frequency converter operates, acquiring an actual temperature value detected by the temperature sensor 10 in real time; judging whether the actual temperature value is less than or equal to a preset first temperature value or not; if the actual temperature value is less than or equal to the first temperature value, judging whether the actual duration of the actual temperature value which is less than or equal to the first temperature value is greater than or equal to the theoretical duration, wherein the theoretical duration is corresponding to the real-time output current of the frequency converter according to a preset rule; if the actual duration is longer than or equal to the theoretical duration, the temperature sensor 10 is judged to be abnormal, so that whether the temperature sensor 10 in the frequency converter is abnormal or not is detected, the situation that the frequency converter cannot acquire the real temperature inside and cannot timely perform over-temperature protection due to the fact that the temperature sensor 10 is abnormal is avoided, the frequency converter is prevented from being damaged or exploded due to overhigh temperature, economic loss is reduced, and safety is improved.

In one embodiment, referring to fig. 3, the method for detecting an abnormality of the frequency converter temperature sensor 10 further includes:

step 200, respectively acquiring temperature values of the starting time and the ending time of the current period detected by the temperature sensor 10.

Step 210, calculating an absolute value of a difference between the temperature value at the starting time and the temperature value at the ending time.

Step 220, determining whether the absolute value of the difference value of the temperature values is greater than or equal to a preset second temperature value.

If the absolute value of the difference between the temperature values is greater than or equal to the second temperature value and the actual duration is less than the theoretical duration, go to step 230.

In step 230, it is determined that the temperature sensor 10 is abnormal.

The detection principle of the method for detecting the abnormality of the frequency converter temperature sensor 10 provided by the embodiment of the invention is as follows:

if the temperature sensor 10 is abnormal in the operation process of the frequency converter, the temperature value obtained by the frequency converter through the temperature sensor 10 jumps, that is, the temperature value of the current cycle ending time obtained by the frequency converter through the temperature sensor 10 is lower than the actual temperature value, so that the absolute value of the difference between the temperature value of the starting time and the temperature value of the ending time of the current cycle is greater than the absolute value of the difference between the actual temperature value of the starting time and the actual temperature value of the ending time of the current cycle. Thus, by determining whether the absolute value of the difference value of the temperature values is greater than or equal to the preset second temperature value, it is possible to detect whether the temperature sensor 10 is abnormal.

The method for detecting the abnormality of the frequency converter temperature sensor 10 further includes the steps of respectively obtaining temperature values of a starting time and an ending time of a current period detected by the temperature sensor 10, calculating an absolute value of a difference value between the temperature value of the starting time and the temperature value of the ending time, judging whether the absolute value of the difference value of the temperature values is larger than or equal to a preset second temperature value or not, and if the absolute value of the difference value of the temperature values is larger than or equal to the second temperature value and an actual duration is smaller than a theoretical duration, judging that the temperature sensor 10 is abnormal, so that the problem that the frequency converter cannot be subjected to over-questioning protection in time and is damaged or exploded due to the fact that the real temperature in the frequency converter cannot be obtained due to the abnormality of the temperature sensor 10 can be avoided.

In one embodiment, after determining that the temperature sensor 10 is abnormal, the method further includes:

and controlling the frequency converter to stop outputting.

According to the method for detecting the abnormality of the temperature sensor 10 of the frequency converter, which is provided by the embodiment of the invention, after the temperature sensor 10 is judged to be abnormal, the frequency converter is controlled to stop outputting, so that the frequency converter is prevented from being damaged due to overhigh temperature.

In one embodiment, after determining that the temperature sensor 10 is abnormal, the method further includes:

and controlling the frequency converter to output an alarm signal for prompting that the temperature sensor 10 is abnormal.

According to the method for detecting the abnormality of the frequency converter temperature sensor 10, provided by the embodiment of the invention, after the temperature sensor 10 is judged to be abnormal, the frequency converter is also controlled to output an alarm signal for prompting that the temperature sensor 10 is abnormal so as to prompt related personnel to perform corresponding treatment in time, and damage or explosion of the frequency converter caused by overhigh temperature due to the abnormality of the temperature sensor 10 is avoided.

In one embodiment, if the actual duration is greater than or equal to the theoretical duration, then it is determined that the temperature sensor 10 is abnormal, step 140, which includes:

it is determined that the temperature sensor 10 is abnormal before the inverter is operated.

The method for detecting the abnormality of the temperature sensor 10 of the frequency converter provided by the embodiment of the invention can not only judge that the temperature sensor 10 is abnormal, but also judge that the temperature sensor 10 is abnormal before the frequency converter runs, thereby being beneficial to tracing the reason of the abnormality and fundamentally solving the problem of the abnormality.

In one embodiment, if the absolute value of the difference between the temperature values is greater than or equal to the second temperature value and the actual duration is less than the theoretical duration, the temperature sensor 10 is determined to be abnormal, i.e. step 230 includes:

it is determined that the temperature sensor 10 is abnormal during the operation of the inverter.

The method for detecting the abnormality of the temperature sensor 10 of the frequency converter provided by the embodiment of the invention can not only judge that the temperature sensor 10 is abnormal, but also judge that the temperature sensor 10 is abnormal in the running process of the frequency converter, thereby being beneficial to tracing the reason of the abnormality and fundamentally solving the problem of the abnormality.

In an embodiment, please refer to the figure, if the absolute value of the difference between the temperature values is smaller than the second temperature value, step 110 is executed.

According to the method for detecting the abnormality of the frequency converter temperature sensor 10 provided by the embodiment of the invention, when the absolute value of the difference value of the temperature values is smaller than the second temperature value, the temperature sensor 10 is normal, the step 110 is repeatedly executed, whether the temperature sensor 10 is abnormal or not is continuously detected, whether the temperature sensor 10 is abnormal or not can be timely detected, and the frequency converter is prevented from being damaged and exploded due to overhigh temperature of the frequency converter caused by the abnormality of the temperature sensor 10.

Referring to fig. 1, an embodiment of the present invention further provides a frequency converter, including a temperature sensor 10 and a main control chip 20 connected to each other, where the temperature sensor 10 is disposed inside the frequency converter and is used for detecting a temperature inside the frequency converter, and the main control chip 20 is used for:

judging whether the frequency converter operates or not;

if the frequency converter runs, acquiring an actual temperature value detected by the temperature sensor 10 in real time;

judging whether the actual temperature value is less than or equal to a preset first temperature value or not;

if the actual temperature value is less than or equal to the first temperature value, judging whether the actual duration of the actual temperature value which is less than or equal to the first temperature value is greater than or equal to the theoretical duration, wherein the theoretical duration is determined according to the real-time output current of the frequency converter;

if the actual duration is greater than or equal to the theoretical duration, it is determined that the temperature sensor 10 is abnormal.

The frequency converter provided by the embodiment of the invention can detect the abnormality of the temperature sensor 10, avoid the damage or explosion of the frequency converter caused by overhigh temperature due to the fact that the frequency converter cannot acquire the internal real temperature because of the abnormality of the temperature sensor 10, reduce the economic loss and improve the use safety of the frequency converter.

In one embodiment, the main control chip 20 is further configured to:

respectively acquiring temperature values of the starting time and the ending time of the current period detected by the temperature sensor 10;

calculating the absolute value of the difference value between the temperature value at the starting moment and the temperature value at the ending moment;

judging whether the absolute value of the difference value of the temperature values is greater than or equal to a preset second temperature value or not;

if the absolute value of the difference between the temperature values is greater than or equal to the second temperature value and the actual duration is less than the theoretical duration, it is determined that the temperature sensor 10 is abnormal.

When the actual duration of the frequency converter provided by the embodiment of the invention is less than the theoretical duration, whether the absolute value of the difference value of the temperature values is greater than or equal to the preset second temperature value or not is judged so as to continuously detect whether the temperature sensor 10 is abnormal or not, so that the damage or explosion of the frequency converter caused by overhigh temperature due to the abnormality of the temperature sensor 10 is avoided, the economic loss is reduced, and the use safety of the frequency converter is also improved.

The embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the method steps described in any of the above embodiments are implemented.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.