CN109655678B - Heat dissipation performance evaluation method and system for electric device - Google Patents
Heat dissipation performance evaluation method and system for electric device Download PDFInfo
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Abstract
The invention discloses a heat dissipation performance evaluation method for an electric device, which comprises the following steps: obtaining a thermal performance parameter threshold value for the electric device based on historical data of the heat radiation performance of the electric device changing along with the running time; calculating real-time variable thermal performance parameters by using a thermal performance parameter calculation formula according to the real-time acquired detection data of the current electric device; and evaluating the heat dissipation performance of the electric device by using the current thermal performance parameter and the thermal performance parameter threshold value, and further outputting the current thermal performance parameter, the thermal performance degradation parameter and/or early warning information so as to implement subsequent operation aiming at heat dissipation treatment of the electric device. The invention can perform online calculation aiming at the existing acquired data, reflects the comprehensive change of the heat dissipation performance of the electric device and the installation mode, thereby identifying the overheating risk, sending an alarm prompt, having small calculation amount and not needing to add new hardware acquisition equipment.
Description
Technical Field
The invention relates to the technical field of electrical control, in particular to a heat dissipation performance evaluation method and system applied to an electric device.
Background
The overheating and explosion of the electric appliances are the most serious failure modes of the electric appliances, and the possibility of the overheating and explosion of the electric appliances is gradually increased along with the change of the electric appliances and the installation modes of the electric appliances. When the equipment provided with the electrical appliance needs to be used for a long time and the use environment is severe, the possibility is increased.
Generally, in the prior art, dynamic calculation is performed by detecting operating parameters such as temperature or current and protection is implemented, when the temperature exceeds a limit value or the current exceeds the limit value, the equipment adopts a power-down operation or shutdown mode to perform self overheating protection, but the calculation amount of the dynamic measurement is large, the protection mode only reflects the instantaneous characteristic of an electric device, and the change of the characteristic of the equipment cannot be detected. In addition, part of the methods for detecting the characteristic change of the electric appliances are mostly performed off-line, and mainly measure certain key parameters.
Disclosure of Invention
In order to solve the above technical problem, an embodiment of the present invention provides a method for evaluating heat dissipation performance of an electric device, where the method includes: the method comprises the steps that firstly, a thermal performance parameter threshold value for the electric device is obtained based on historical data of the heat dissipation performance of the electric device changing along with running time; step two, calculating the thermal performance parameters which change in real time by using a thermal performance parameter calculation formula according to the detection data of the current electric device acquired in real time; and thirdly, evaluating the heat dissipation performance of the electric device by using the current thermal performance parameter and the thermal performance parameter threshold value, and further outputting the current thermal performance parameter, the current thermal performance degradation parameter and/or early warning information so as to implement subsequent operation aiming at heat dissipation treatment of the electric device.
Preferably, further, the detection data includes: the temperature monitoring device comprises an actual value of a temperature monitoring point of the electric device, an actual working current of the electric device, and an ambient temperature or a temperature of a radiator.
Preferably, in the second step, the thermal performance parameter is calculated by using the following expression:
Q＝(T-TA)/I2
wherein Q represents the thermal performance parameter, T represents the actual value of the temperature monitoring point, and T representsARepresenting said ambient temperature or said radiator temperature, I representing said actual operationThe current is applied.
Preferably, in the third step, further, if the thermal performance parameter of the current electric device exceeds the thermal performance parameter threshold, outputting early warning information.
Preferably, the thermal performance degradation parameter is obtained by calculating a ratio of the current thermal performance parameter to the thermal performance parameter threshold.
In another aspect, a heat dissipation performance evaluation system for an electric device is provided, the system including the following modules: the preprocessing module is used for obtaining a thermal performance parameter threshold value aiming at the electric device on the basis of historical data of the heat radiation performance of the electric device changing along with running time; the on-line calculation module is used for calculating the thermal performance parameters which change in real time by using a thermal performance parameter calculation formula according to the detection data of the current electric device acquired in real time; and the online evaluation module is used for evaluating the heat dissipation performance of the electric device by utilizing the current thermal performance parameter and the thermal performance parameter threshold value, and further outputting the current thermal performance parameter, the current thermal performance degradation parameter and/or early warning information so as to implement subsequent operation aiming at heat dissipation treatment of the electric device.
Preferably, further, the detection data includes: the temperature monitoring device comprises an actual value of a temperature monitoring point of the electric device, an actual working current of the electric device, and an ambient temperature or a temperature of a radiator.
Preferably, the online computation module computes the thermal performance parameter using the expression:
Q＝(T-TA)/I2
wherein Q represents the thermal performance parameter, T represents the actual value of the temperature monitoring point, and T representsARepresenting the ambient temperature or the radiator temperature, and I representing the actual operating current.
Preferably, the online evaluation module evaluates by using the following method: and if the thermal performance parameter of the current electric device exceeds the thermal performance parameter threshold value, outputting early warning information.
Preferably, the online evaluation module comprises: and the performance evaluation unit is used for calculating the ratio of the current thermal performance parameter to the thermal performance parameter threshold value to obtain the thermal performance degradation parameter.
Compared with the prior art, one or more embodiments in the above scheme can have the following advantages or beneficial effects:
the embodiment of the invention utilizes the acquired existing data to carry out on-line calculation, can reflect the comprehensive change of the heat dissipation performance of the electric device and the installation mode, thereby identifying the overheating risk, sending out the alarm prompt, having small calculation amount and not needing to add new hardware acquisition equipment.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a diagram illustrating steps of a method for evaluating heat dissipation performance of an electric device according to an embodiment of the present application.
Fig. 2 is a block diagram of a heat dissipation performance evaluation system for an electric device according to an embodiment of the present application.
Detailed Description
The following detailed description of the embodiments of the present invention will be provided with reference to the drawings and examples, so that how to apply the technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented. It should be noted that, as long as there is no conflict, the embodiments and the features of the embodiments of the present invention may be combined with each other, and the technical solutions formed are within the scope of the present invention.
In order to overcome the defects in the prior art, the embodiment of the application provides a method for establishing the thermal performance parameter only by acquiring the existing detection data so as to reflect the current heat dispersion performance of the electric device, judge the thermal performance degradation condition of the electric device, estimate the position and the reason of the overheating problem of the electric device in the actual use process according to the feedback parameters of the electric device and the equipment, replace the electric device and prevent the overheating explosion to a certain extent.
Fig. 1 is a diagram illustrating steps of a method for evaluating heat dissipation performance of an electric device according to an embodiment of the present application. As shown in fig. 1, the method comprises the steps of: the method comprises the steps that firstly, a thermal performance parameter threshold value for an electric device is obtained based on historical data of the heat dissipation performance of the electric device changing along with operation time; step two, calculating real-time changing thermal performance parameters by using a thermal performance parameter calculation formula according to the detection data of the current electric device acquired in real time; and thirdly, evaluating the heat dissipation performance of the electric device by using the current thermal performance parameter and the threshold value of the thermal performance parameter, and further outputting the current thermal performance parameter, the thermal performance degradation parameter and/or early warning information so as to implement subsequent operation aiming at heat dissipation treatment of the electric device.
Specifically, firstly, in the step one (S110), the electrical device needs to be preprocessed, the electrical device and the load device are subjected to matching test, a large amount of matching historical data of working states including actual working current of the electrical device, actual values of temperature monitoring points of the electrical device in different periods, temperatures of a heat sink of the electrical device in different periods, internal resistance of the electrical device, and thermal resistance from the temperature monitoring points of the electrical device to the heat sink under different loads, different working frequencies and operation time are output, and based on the inherent information of the electrical characteristics, rated power, rated current and the like of the electrical device, the working current threshold value, the temperature monitoring point threshold value, the radiator temperature threshold value (environment temperature threshold value), the internal resistance threshold value of the electrical device and the thermal resistance threshold value from the electrical device temperature monitoring point to the radiator of the electrical device are comprehensively analyzed. Wherein, generally, the actual value of the temperature monitoring point of the electrical appliance is expressed by the following expression:
T＝TA+Rth*(R*I2) (1)
wherein T represents the actual value of the temperature monitoring point of the electric device, TAIndicating the radiator temperature, RthThe temperature monitoring point of the electrical appliance is represented as the thermal resistance from the temperature monitoring point to the radiator, R represents the internal resistance of the electrical appliance, and I represents the actual working current of the electrical appliance. It should be noted that, when the electrical appliance is not equipped with a heat sink, the ambient temperature is used to replace the temperature of the heat sink, and the thermal resistance from the temperature monitoring point to the environment is used to replace the thermal resistance from the temperature monitoring point to the heat sink.
Further, the formula (1) is deformed to obtain a thermal performance parameter calculation formula, and the thermal performance parameter is expressed by using the following expression:
Q＝Rth*R＝(T-TA)/I2 (2)
wherein Q represents a thermal performance parameter. Therefore, after obtaining the thermal performance parameter calculation formula, the corresponding thermal performance parameter threshold value can be calculated, so that the preprocessing process is ended, and the processing proceeds to step S120.
In step S120, referring to equation (2), the parameters on the left side of the formula include the thermal resistance from the temperature monitoring point of the electrical device to the heat sink and the internal resistance of the electrical device, which are characteristic parameters of the electrical device, and the product of the two parameters reflects the heat dissipation performance of the electrical device, i.e., the thermal performance parameter; the detection data on the right side of the formula comprises the actual value of the temperature monitoring point of the electric appliance, the temperature (or the ambient temperature) of the radiator and the actual working current of the electric appliance, and the parameters can be directly acquired in real time or further calculated by using the existing detection equipment such as a current sensor and a temperature sensor which is installed on a device where the electric appliance is located. Therefore, online calculation can be performed by using a thermal performance parameter calculation formula only according to the currently acquired detection data of the three electric devices, so that thermal performance parameters which change in real time are obtained, the heat dissipation characteristics of the electric devices are monitored in real time, and corresponding evaluation is performed.
Then, (step S130) the thermal performance parameter and the thermal performance parameter threshold obtained by the online calculation are used to evaluate the thermal performance of the electrical device, and further output the current thermal performance parameter, the thermal performance degradation parameter, and/or the early warning information, so as to implement the subsequent actions for the thermal dissipation treatment of the electrical device. Specifically, when the thermal performance parameter of the electric device does not exceed the thermal performance parameter threshold value, the electric device is in a normal working state, and the current thermal performance degradation parameter is calculated and output; in addition, under the evaluation result, the embodiment of the application can also output thermal performance parameters and corresponding detection data, and record the thermal performance parameters and the corresponding detection data as historical data so as to enable fault calling or monitoring personnel to observe the data in real time. In addition, when the thermal performance parameter of the electric device exceeds the thermal performance parameter threshold value, when the current abnormal thermal performance parameter and the current abnormal thermal performance parameter are output, early warning information is output, wherein the early warning information comprises an early warning signal and detection data corresponding to the current thermal performance parameter, a monitoring person can judge the fault position of the electric device (judge the position of the abnormal point) according to the actual condition of the detection data, and further judge and implement the follow-up operations such as maintaining or replacing the electric device on the circuit where the fault position is located. It should be noted that the thermal performance degradation parameter is a ratio of the current thermal performance parameter to a thermal performance parameter threshold value, and is used for evaluating the thermal performance degradation condition of the electric device and reflecting the working performance of the electric device in real time, so that the electric device is replaced, and overheating and explosion are prevented to a certain extent.
(one example)
Taking the overheat protection of the IGBT module as an example, the controller may acquire the temperature of the monitoring point of the IGBT module, the temperature of the radiator, and the current flowing through the IGBT module in real time. By calculating (T-T)A)/I2The change of the temperature can judge whether the heat dissipation performance between the IGBT module and the heat conducting silicone grease and the radiator can not meet the initial requirement of design; and if the heat dissipation performance exceeds the threshold value, judging that the IGBT module needs to be returned to a factory for replacement or coated with heat conduction silicone grease again, and the like. The set data of the module heat dissipation performance threshold value is obtained from the IGBT module in the process of carrying out the load matching test in the early stage.
Fig. 2 is a block diagram of a heat dissipation performance evaluation system for an electric device according to an embodiment of the present application. As shown in fig. 2, the system includes the following modules: a preprocessing module 21, an online calculation module 22, an online evaluation module 23, and a database storage module 24.
The following is a detailed description of each module. In the preprocessing module 21, the operation process is as shown in step S110, and the module obtains a thermal performance parameter threshold value for the electrical device based on the historical data of the change of the heat radiation performance of the electrical device with the operation time, and stores the thermal performance parameter threshold value, and specifically, the module also stores a working current threshold value, a temperature monitoring point threshold value, a radiator temperature threshold value, an electrical device internal resistance threshold value, a thermal resistance threshold value from the electrical device temperature monitoring point to the radiator, and a thermal performance parameter calculation formula for the electrical device, which are obtained through a matching test of the electrical device and the load device, and further obtains the thermal performance parameter threshold value by using the formula (2) (the thermal performance calculation formula).
Then, the on-line calculating module 22 is described, which is connected to the preprocessing module 21, and measures or further calculates the detection data of the current electrical device in real time through the current sensor, the temperature sensor, and other common detection devices installed on the device where the electrical device is located, calls the thermal performance parameter calculation formula in the preprocessing module 21, and calculates the thermal performance parameter that changes in real time. Wherein detecting the data comprises: the actual value of the temperature monitoring point of the electric device, the actual working current of the electric device, and the ambient temperature or the temperature of the radiator.
Next, a database storage module 24, which is connected to the online computation module 22, receives the current detection data of the online computation module 22 and the corresponding current thermal performance parameters, and records them as historical data for subsequent data evaluation, and/or fault location, and/or real-time observation of the historical data.
And finally, the online evaluation module 23 evaluates the heat dissipation performance of the electric appliance, and further outputs the current thermal performance parameter, the thermal performance degradation parameter, and/or the early warning information, so as to implement the subsequent action of the heat dissipation treatment of the electric appliance. The online evaluation module 23 includes: a performance evaluation unit 231, and an evaluation result output unit 232. Specifically, the performance evaluation unit 231 is connected with the preprocessing module 21 and the database storage module 24, and calculates the thermal performance degradation parameter in real time and sends the thermal performance degradation parameter to the evaluation result output unit 232 through the current thermal performance parameter acquired by the database storage module 24 and the thermal performance parameter threshold value retrieved from the preprocessing module 21, and further compares the current thermal performance parameter with the thermal performance parameter threshold value, and outputs an early warning signal if the thermal performance parameter of the current electric device exceeds the thermal performance parameter threshold value; the evaluation result output unit 232 can receive and analyze the thermal performance degradation parameter and display the thermal performance degradation parameter in real time, and can retrieve and display the current abnormal thermal performance parameter (namely the current thermal performance parameter exceeding the thermal performance parameter threshold) from the database storage module 24 and/or display and output the early warning signal and/or display the detection data corresponding to the abnormal thermal performance parameter after obtaining the effective early warning signal, so as to provide data support for the fault judgment of an operator and realize the performance degradation early warning; in addition, monitoring personnel can judge the fault position of the electric appliance according to the actual condition of the detection data corresponding to the abnormal thermal performance parameters (judge the position of the abnormal point), and further judge and implement the follow-up operations of maintaining or replacing the electric appliance and the like on the circuit where the abnormal point is positioned.
According to the embodiment of the invention, by introducing the heat dissipation performance parameters and the calculation formula thereof, the inherent heat dissipation performance parameters of the electric appliance can be calculated on line and evaluated without adding new hardware acquisition equipment after calculation aiming at the existing acquired data, and the decline information and the early warning information of the electric appliance are output for implementing the follow-up action aiming at the heat dissipation treatment of the electric appliance. The method and the device can reflect the comprehensive change of the heat dissipation performance of the electric appliance and the installation mode, identify the overheating risk of the device according to the change of the inherent parameters, and give an alarm before the problems of aging, performance mutation and the like of the electric appliance occur; the invention has small calculation amount and can be completely calculated on line; and the two conditions of long-term performance change and sudden change of heat dissipation performance of the electric device can be simultaneously reflected.
Although the embodiments of the present invention have been described above, the above descriptions are only for the convenience of understanding the present invention, and are not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (4)
1. A method for evaluating heat dissipation performance of an electric device, comprising the steps of:
the method comprises the steps that firstly, a thermal performance parameter threshold value for the electric device is obtained based on historical data of the heat dissipation performance of the electric device changing along with running time;
step two, calculating the thermal performance parameter which changes in real time by using a thermal performance parameter calculation formula according to the current detection data of the electric device acquired in real time, wherein the product of the internal resistance and the thermal resistance of the electric device is used for reflecting the heat dissipation performance of the electric device, the detection data comprises the actual value of the temperature monitoring point of the electric device, the actual working current of the electric device and the environmental temperature, and in the step two, the thermal performance parameter is calculated by using the following expression:
Q＝(T-TA)/I2
wherein Q represents the thermal performance parameter, T represents the actual value of the temperature monitoring point, and T representsARepresenting the ambient temperature, I representing the actual operating current;
thirdly, evaluating the heat dissipation performance of the electric device by using the current thermal performance parameter and the threshold value of the thermal performance parameter, and further outputting the current thermal performance parameter, the current thermal performance degradation parameter and/or the early warning information to implement the subsequent operation of heat dissipation treatment of the electric device,
if the thermal performance parameter of the current electric device does not exceed the thermal performance parameter threshold, calculating and outputting a current thermal performance degradation parameter, outputting a thermal performance parameter and corresponding detection data, and recording the thermal performance parameter and the corresponding detection data as historical data;
if the thermal performance parameter of the current electric device exceeds the thermal performance parameter threshold value, outputting early warning information to judge the fault position of the electric device according to the actual condition of detection data in the early warning information, and further judging and implementing the follow-up operation of maintaining or replacing the electric device on the circuit where the fault position is located.
2. The evaluation method of claim 1, further comprising calculating a ratio of the current thermal performance parameter to the thermal performance parameter threshold to obtain the thermal performance degradation parameter.
3. A heat dissipation performance evaluation system for an electric device, characterized by comprising the following modules:
the preprocessing module is used for obtaining a thermal performance parameter threshold value aiming at the electric device on the basis of historical data of the heat radiation performance of the electric device changing along with running time;
the on-line calculation module is used for calculating the thermal performance parameters which change in real time by using a thermal performance parameter calculation formula according to the current detection data of the electric device acquired in real time, wherein the product of the internal resistance and the thermal resistance of the electric device is used for reflecting the heat dissipation performance of the electric device, the detection data comprises the actual value of a temperature monitoring point of the electric device, the actual working current of the electric device and the environmental temperature, and the on-line calculation module is used for calculating the thermal performance parameters by using the following expression:
Q＝(T-TA)/I2
wherein Q represents the thermal performance parameter, T represents the actual value of the temperature monitoring point, and T representsARepresenting the ambient temperature, I representing the actual operating current;
the on-line evaluation module is used for evaluating the heat dissipation performance of the electric device by using the current thermal performance parameter and the thermal performance parameter threshold value, and further outputting the current thermal performance parameter, thermal performance degradation parameter and/or early warning information so as to implement subsequent operation aiming at heat dissipation treatment of the electric device, and the on-line evaluation module is used for evaluating by using the following method:
if the thermal performance parameter of the current electric device does not exceed the thermal performance parameter threshold, calculating and outputting a current thermal performance degradation parameter, outputting a thermal performance parameter and corresponding detection data, and recording the thermal performance parameter and the corresponding detection data as historical data;
if the thermal performance parameter of the current electric device exceeds the thermal performance parameter threshold value, outputting early warning information to judge the fault position of the electric device according to the actual condition of detection data in the early warning information, and further judging and implementing the follow-up operation of maintaining or replacing the electric device on the circuit where the fault position is located.
4. The evaluation system of claim 3, further wherein the online evaluation module comprises:
and the performance evaluation unit is used for calculating the ratio of the current thermal performance parameter to the thermal performance parameter threshold value to obtain the thermal performance degradation parameter.
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| CN103197745A (en) * | 2012-01-04 | 2013-07-10 | 联想(北京)有限公司 | Heat radiation method and computer |
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