A method for quantifying the strength of alternating damp heat tests on electronic products

Abstract

This invention provides a method for quantifying the intensity of alternating damp heat tests on electronic products. This method achieves parameterized test design by mining and extracting key test parameters, facilitating integration with intelligent testing equipment while enabling quantitative calculation of test intensity. It supports overall comparison of different test schemes and allows for comparison and selection of optimal test schemes using tools such as Design of Experiments (DOE). This overcomes the limitation of existing technologies that cannot quantify the intensity of alternating damp heat tests. All parameters involved in this method can be extracted from existing test designs, requiring no changes or adjustments to current test methods and procedures, and incurring no additional test costs.

Description

Technical Field

[0001] This invention relates to the technical field of calculating the overall intensity of alternating damp heat tests on electronic products, and particularly to a method for quantifying the intensity of alternating damp heat tests on electronic products. Background Technology

[0002] Because electronic products inevitably come into contact with varying temperature and humidity environments during use, environmental testing is typically conducted during product development to verify and enhance their reliability in humid and hot environments, especially high-temperature and high-humidity environments. This testing usually relies on the alternating damp heat test standards GB / T2423.4-2008 and GJB 150.9A-2009 to expose and identify potential design flaws under humid and hot conditions. However, with the development of new materials, improved equipment precision, and refined manufacturing processes, existing alternating damp heat test standards are often not stringent enough. Therefore, in practice, different companies often adjust and modify some test parameters in existing alternating damp heat test standards to create custom tests based on their own product characteristics. However, such test designs often rely heavily on the drawing of test profiles and textual descriptions, lacking the extraction of test parameters. This makes it difficult to match with modern intelligent testing equipment and to compare the intensity of different tests, thus failing to effectively select the most suitable test design scheme and parameters for exposing product environmental reliability defects.

[0003] There are two main domestic standards for alternating damp heat testing: GB / T2423.4-2008 "Environmental Testing for Electrical and Electronic Products - Part 2: Test Methods - Test Db: Alternating Damp Heat (12h+12h Cycle)" (equivalent to IEC 60068-2-30:2005) and the military standard GJB 150.9A-2009 "Laboratory Environmental Testing Methods for Military Equipment - Part 9: Damp Heat Testing" (equivalent to US military standard MIL-STD-810F). The former provides two alternating damp heat test cycles, using the maximum temperature and number of cycles to indicate the severity of the test. The standard's accompanying diagrams show the heating, isothermal, cooling, and low-temperature phases of the test cycle, along with the corresponding temperature and humidity parameters. The latter provides a "Damp Heat Cycle Control Chart" as a test profile, supplemented with textual explanations, such as... Figure 1 As shown, the severity of the test is increased by extending the test duration. None of the above standards provide a method for quantifying the test intensity.

[0004] While the aforementioned technologies describe the alternating damp heat test process based on text and experimental cross-sectional diagrams, illustrating the heating, isothermal, cooling, and low-temperature stages and their corresponding temperature and humidity parameter requirements, and enhance the test's rigor by increasing the maximum temperature, number of cycles, and duration, the issue of how to quantify and compare the specific test intensity—that is, the rigor—remains unresolved, failing to meet practical application needs. In particular, with the continuous emergence of new materials, the increasing precision of equipment, and the continuous improvement of production processes, product reliability in damp heat environments has been effectively enhanced. Existing alternating damp heat test standards are often insufficiently stringent, frequently requiring adjustments to parameters such as maximum temperature, duration, heating rate, cooling rate, and number of test cycles to obtain the optimal alternating damp heat test cycle scheme. This helps companies quickly and effectively identify product environmental reliability defects and improve product design. The inability to quantify the intensity of alternating damp heat tests hinders effective integration with the highly parameterized nature of modern intelligent testing equipment, makes it difficult to compare test intensities between different tests, and makes it challenging to utilize tools such as Design of Experiments (DOE) for comparing and selecting the best test schemes. Summary of the Invention

[0005] The purpose of this invention is to provide...

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A method for quantifying the intensity of alternating damp heat testing of electronic products, used to quantitatively calculate the overall intensity of alternating damp heat testing, includes the following steps:

[0008] Step S1: Extract the temperature parameters from the alternating damp heat test scheme, including the highest temperature, lowest temperature, heating time and high-temperature maintenance time within one test cycle, and cooling time and low-temperature maintenance time within one test cycle; Step S2: Calculate the temperature intensity parameters of the alternating damp heat test based on the temperature difference between the highest and lowest temperatures, the proportion of high-temperature maintenance time within one test cycle, the average heating rate, and the average cooling rate; Step S3: Extract the humidity parameters from the alternating damp heat test scheme, including the highest and lowest humidity during the high-humidity phase within one test cycle. Step S4: Calculate the humidity intensity parameter of the alternating damp heat test based on the humidity difference between the highest and lowest humidity and the proportion of high humidity duration within a test cycle; Step S5: Define and calculate the temperature intensity coupling coefficient and humidity intensity coupling coefficient; Step S6: Calculate the overall intensity of the alternating damp heat test based on the temperature intensity parameter, humidity intensity parameter, temperature intensity coupling coefficient, and humidity intensity coupling coefficient of the alternating damp heat test.

[0009] Preferably, in step S1, the following definition is made: the highest temperature T H Minimum temperature T L The heating time T1, the high temperature holding time T2, the cooling time T3, and the low temperature holding time T4;

[0010] In step S2, based on the highest temperature T H With the lowest temperature T L Calculate the temperature difference T v T v =T H -T L ;

[0011] Based on the high-temperature maintenance time T2, the percentage m of the high-temperature duration within one test cycle is calculated.

[0012] The average heating rate V is calculated based on the temperature during the heating stage. r ,

[0013] The average cooling rate V is calculated based on the temperature during the cooling phase. d ,

[0014] Define the temperature intensity parameter of the alternating damp heat test scheme as X, according to the formula X = T H *T v *V r*V d *m calculates the temperature intensity parameters of the alternating damp heat test.

[0015] Preferably, in step S3, the following definition is made: the highest humidity and the lowest humidity during the high humidity stage are respectively the upper limit of high humidity U. H and the lower limit of high humidity U m The highest and lowest humidity levels during the low humidity phase are respectively the upper limit of low humidity U. n and low humidity lower limit U L High humidity maintenance time U1 and low humidity maintenance time U2;

[0016] In step S4, the humidity difference U is calculated based on the highest humidity during the high humidity phase and the lowest humidity during the low humidity phase. v U v =U H -U L ;

[0017] Based on the high humidity maintenance time U1, calculate the proportion n of high humidity duration within one test cycle.

[0018] Define the humidity intensity parameter of the alternating damp heat test as Y, according to the formula Y = U H [(U H -U n )+(U m -U L )]*U v *n calculates the humidity intensity parameters for alternating damp heat tests.

[0019] Preferably, in step S5, the humidity intensity coupling coefficient P is defined, with 0.5 as the base, and calculated according to the formula P = 0.5 - 0.05 * n, where n is the characteristic number of the protection level of the enclosure against harmful effects caused by water ingress in GB / T4208-2017 "Degrees of Protection Provided by Enclosures (IP Code)", and the value range is 0-9; the temperature intensity coupling coefficient Q is defined, and its value is calculated according to the formula Q = 1 - P.

[0020] Preferably, in step S6, the alternating damp heat test intensity Z is defined according to the formula... Calculate the intensity of the alternating damp heat test; where T is the running time of one test cycle and S is the total number of damp heat cycles in one test cycle.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) The method of the present invention realizes parameterized test design by mining and extracting key test parameter information, which facilitates the connection of intelligent test equipment and enables quantitative calculation of test intensity. It can support the overall comparison of different test schemes and can also use tools and methods such as DOE (Design of Experiments) to compare and screen the best test schemes, thus making up for the limitation of the prior art in failing to quantify the intensity of alternating damp heat test.

[0023] (2) This invention can realize the quantitative evaluation of the overall intensity of alternating damp heat test. On the one hand, it is conducive to the realization of parameterized test design and easy to connect with intelligent test equipment. On the other hand, it also supports the overall comparison of different test schemes and strengthens the applicability of tools and methods such as DOE (Design of Experiments) in the process of selecting the best test scheme.

[0024] (3) The parameters involved in the method of the present invention can all be extracted from the existing experimental design, so there is no need to change or adjust the existing experimental methods and steps, and no need to increase the experimental cost. Attached Figure Description

[0025] Figure 1 This is the alternating damp heat test profile using the GJB 150.9A-2009 standard in the existing technology;

[0026] Figure 2 A flowchart illustrating a method for quantifying the intensity of alternating damp heat tests on electronic products, provided as an embodiment of the present invention. Detailed Implementation

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0028] like Figure 2 The diagram illustrates a method for quantifying the intensity of alternating damp heat tests on electronic products, disclosed in this invention. This method is used to quantitatively calculate the overall intensity of alternating damp heat tests and includes the following steps:

[0029] Step S1: Based on the damp heat cycle control chart and textual description in the GJB 150.9A-2009 alternating damp heat test standard, extract the temperature parameters in the alternating damp heat test scheme, including the highest temperature T in the alternating damp heat test scheme. H Minimum temperature T L The heating time T1 and the high temperature holding time T2 within one test cycle, as well as the cooling time and the low temperature holding time T4 within one test cycle.

[0030] High temperature T H The highest temperature in the test plan.

[0031] Low temperature T L : The lowest temperature in the test plan.

[0032] Heating time T1: The time it takes to rise from the lowest temperature to the highest temperature within one cycle.

[0033] High temperature duration T2: The duration of maintaining high temperature within one cycle.

[0034] Cooling time T3: The time it takes to cool from the highest temperature to the lowest temperature within one cycle.

[0035] Low temperature sustaining time T4: The duration of maintaining high temperature within one cycle.

[0036] Step S2: Based on the highest temperature T H With the lowest temperature T L Calculate the temperature difference T v T v =T H -T L ;

[0037] Based on the high-temperature maintenance time T2, the percentage m of the high-temperature duration within one test cycle is calculated.

[0038] The average heating rate V is calculated based on the temperature during the heating stage. r ,

[0039] The average cooling rate V is calculated based on the temperature during the cooling phase. d ,

[0040] Define the temperature intensity parameter of the alternating damp heat test scheme as X.

[0041] According to the formula X = T H *T v *V r *V d *m calculates the temperature intensity parameters of the alternating damp heat test.

[0042] Step S3: Extract the humidity parameters from the alternating damp heat test scheme, including the highest humidity during the high humidity phase within one test cycle, i.e., the upper limit of high humidity U. H And the lowest humidity, i.e., the lower limit of high humidity U m The highest humidity during the low-humidity phase within a test cycle, i.e., the upper limit of low humidity U. n And the lowest humidity, i.e., the lower limit of low humidity U L And the high humidity maintenance time U1 and low humidity maintenance time U2 within a test cycle.

[0043] High humidity upper limit U HThe highest humidity during the high humidity phase of a cycle, i.e., the highest humidity in the test plan.

[0044] High humidity lower limit U m The lowest humidity level during the high humidity phase of a cycle.

[0045] Low humidity upper limit U n The highest humidity during the low-humidity phase of a cycle.

[0046] Low humidity lower limit U L The lowest humidity during the low-humidity phase of a cycle, i.e., the lowest humidity in the test plan.

[0047] High humidity maintenance time U1: The duration of maintaining high humidity within one cycle.

[0048] Low humidity maintenance time U2: The duration of maintaining low humidity within one cycle.

[0049] Step S4: Calculate the humidity difference U based on the highest humidity during the high humidity phase and the lowest humidity during the low humidity phase. v U v =U H -U L ;

[0050] Based on the high humidity maintenance time U1, calculate the proportion n of high humidity duration within one test cycle.

[0051] Define the humidity intensity parameter of the alternating damp heat test as Y, according to the formula Y = U H [(U H -U n )+(U m -U L )]*U v *n Calculate the humidity intensity parameters for the alternating damp heat test. Step S5: Define the humidity intensity coupling coefficient P, based on 0.5, calculated according to the formula P = 0.5 - 0.05 * n, where n is the characteristic number of the protection level of the enclosure against harmful effects on the equipment due to water ingress in GB / T 4208-2017 "Degrees of Protection Provided by Enclosures (IP Code)", with a value range of 0-9 (the test intensity value of the current scheme is obtained by calculating the test intensity based on the enclosure protection level of the smart meter); Define the temperature intensity coupling coefficient Q, whose value is calculated according to the formula Q = 1 - P.

[0052] Furthermore, in this embodiment, when calculating the temperature and humidity intensity coupling coefficient, in addition to calculating the weight of temperature and humidity intensity based on the enclosure protection level in the GB / T 4208-2017 standard, the weight can also be determined according to the ease with which the product gets damp or its sensitivity to environmental humidity.

[0053] Step S6: Based on the alternating damp heat test temperature intensity parameters, alternating damp heat test humidity intensity parameters, the temperature intensity coupling coefficient, and the humidity intensity coupling coefficient, define the alternating damp heat test intensity Z, according to the formula... Calculate the intensity of the alternating damp heat test; where T is the running time of one test cycle and S is the total number of damp heat cycles in one test cycle.

[0054] By adjusting the variables affecting the alternating damp heat test intensity value, the test intensity is adjusted, and the optimal alternating damp heat test design scheme is screened and compared based on the exposure rate of product design reliability defects under different intensities.

[0055] Furthermore, in this embodiment, when calculating the overall intensity of the damp heat test, the duration T of a single cycle and the total number of cycles S of the damp heat test are not considered. This allows for the calculation and comparison of the intensity of a single cycle test, and also provides the function of quantifying the test intensity.

[0056] In summary, this invention extracts the parameter information of temperature and humidity from the alternating damp heat test scheme, calculates their respective test intensities, and then couples them together; based on the product's casing protection (waterproof) level or the product's susceptibility to moisture and sensitivity to environmental humidity, the weight allocation of temperature and humidity in the test intensity is adjusted.

[0057] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0058] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for quantifying the intensity of alternating damp heat testing of electronic products, used to quantitatively calculate the overall intensity of alternating damp heat testing, characterized in that, Includes the following steps: Step S1: Extract the temperature parameters in the alternating damp heat test scheme, including the highest temperature, lowest temperature, heating time and high temperature holding time in one test cycle, and cooling time and low temperature holding time in one test cycle. In step S1, the following definition is made: the highest temperature T H Minimum temperature T L The heating time T1, the high temperature holding time T2, the cooling time T3, and the low temperature holding time T4; In step S2, based on the highest temperature T H With the lowest temperature T L Calculate the temperature difference T v T v =T H -T L ; Based on the high-temperature maintenance time T2, the percentage m of the high-temperature duration within one test cycle is calculated. The average heating rate V is calculated based on the temperature during the heating stage. r , The average cooling rate V is calculated based on the temperature during the cooling phase. d , Define the temperature intensity parameter of the alternating damp heat test scheme as X. According to the formula X = T H *T v *V r *V d *m calculates the temperature intensity parameters of the alternating damp heat test; Step S2: Calculate the temperature intensity parameters of the alternating damp heat test based on the temperature difference between the highest and lowest temperatures, the proportion of high temperature duration within one test cycle, the average heating rate, and the average cooling rate. Step S3: Extract the humidity parameters from the alternating damp heat test scheme, including the highest and lowest humidity during the high humidity phase in one test cycle, the highest and lowest humidity during the low humidity phase in one test cycle, and the duration of the high humidity phase and the duration of the low humidity phase in one test cycle. In step S3, the following definition is made: the highest humidity and the lowest humidity during the high humidity stage are respectively the upper limit of high humidity U. H and the lower limit of high humidity U m The highest and lowest humidity levels during the low humidity phase are respectively the upper limit of low humidity U. n and low humidity lower limit U L High humidity maintenance time U1 and low humidity maintenance time U2; In step S4, the humidity difference U is calculated based on the highest humidity during the high humidity phase and the lowest humidity during the low humidity phase. v U v =U H -U L ; Based on the high humidity maintenance time U1, calculate the proportion n of high humidity duration within one test cycle. Define the humidity intensity parameter of the alternating damp heat test as Y. According to the formula Y=U H [(U H -U n )+(U m -U L )]*U v *n calculates the humidity intensity parameters of the alternating damp heat test; Step S4: Calculate the humidity intensity parameter of the alternating damp heat test based on the humidity difference between the highest and lowest humidity and the proportion of high humidity duration within one test cycle. Step S5: Define and calculate the temperature intensity coupling coefficient and humidity intensity coupling coefficient; In step S5, the humidity intensity coupling coefficient P is defined, with 0.5 as the benchmark, and calculated according to the formula P = 0.5 - 0.05 * n, where n is the characteristic number of the protection level of the enclosure against harmful effects caused by water ingress in GB / T 4208-2017 "Degrees of Protection Provided by Enclosures (IP Code)", and the value range is 0-9. Define the temperature intensity coupling coefficient Q, whose value is calculated according to the formula Q = 1 - P; Step S6: Calculate the overall intensity of the alternating damp heat test based on the temperature intensity parameters, humidity intensity parameters, temperature intensity coupling coefficient, and humidity intensity coupling coefficient of the alternating damp heat test. In step S6, the alternating damp heat test intensity Z is defined according to the formula. Calculate the intensity of the alternating damp heat test; In the formula, T is the running time of one test cycle, and S is the total number of runs of the wet heat cycle in one test cycle.

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