CN115309211B - Heating power determination method for aging temperature control and temperature control method - Google Patents
Heating power determination method for aging temperature control and temperature control method Download PDFInfo
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Abstract
The invention is suitable for the technical field of aging of electronic components and provides a heating power determination method and a temperature control method for aging temperature control, which determine the position when a door is opened through early workThe heating power required to be compensated is used for compensating the temperature of the aging test box while the door is opened, so that the temperature in the aging test box can be effectively maintained in the temperature range required by the aging test. At a set aging temperature T aim Under the condition that the opening degree of the door of the aging test box is the same each time, measuring the temperature change value of the temperature field in the aging test box corresponding to different door opening time through tests; carrying out linear fitting on the obtained temperature change value and different door opening times to obtain a linear correlation value k; determining the temperature compensation power P when the door is opened according to the following formula:
where c is the specific heat capacity and m is the mass of air in the test chamber.
Description
Technical Field
The invention relates to the technical field of aging of electronic components, in particular to a heating power determining method and a temperature control method for aging temperature control.
Background
In the tests of screening, identification, quality consistency inspection and the like, the high-temperature aging or high-temperature service life test is usually necessary. High temperature aging or high temperature life test requires applying temperature stress to the tested components using a high temperature test chamber. The tested components are usually mounted on a PCB (printed circuit board) test circuit board and placed in a high temperature box, and electrical stresses such as voltage, current, frequency and the like are applied to the tested components at high temperature, and electrical parameters of the components are monitored as necessary. The tested components work at high temperature, so that the aging of the components is accelerated, and the effect of shortening the test time is achieved. In order to enlarge the use capacity of the high-temperature test box, more samples can be tested at one time, the high-temperature test box for the service life test can contain 3 to 10 PCB test circuit boards, and hundreds of elements can be tested at the same time.
In the experimental process, when the performance index of a certain electronic component is found to exceed a set threshold (for example, the leakage current exceeds the set threshold), the electronic component is often required to be powered off and taken out from the high-temperature test box. This is because when the performance index of the electronic component in the high temperature test box exceeds the set threshold, it often indicates that the electronic component has been damaged, or is about to be damaged, and if it is not taken out, it may be dangerous or may affect the test of other electronic components on the PCB board. When some electronic components need to be taken out of the high-temperature test box, the high-temperature test box door needs to be opened inevitably, and at the moment, due to the opening of the box door, the hot air in the box conducts heat outwards to reduce the temperature in the box.
The main technical index of the existing high-temperature test box for testing electronic components is that the temperature change of each point of a working area of the test box along with time is within +/-2 ℃ (time fluctuation), namely, when the temperature fluctuation in the test box exceeds +/-2 ℃ of a set value, the aging condition is not satisfied.
For this reason, the prior art focuses on improving the aging test chamber so that it can better achieve a constant and uniform temperature inside the chamber.
If patent CN201510925634.2 discloses a high-reliability temperature test box for electronic components, to current components and parts high temperature burn-in and life test with the shortcoming of high temperature test box, can solve the problem that the temperature space inhomogeneity that the air flow field confusion brought is big and the sample easily receives the influence of peripheral sample, slow down the influence of test box external environment temperature fluctuation to the inside temperature of test box.
KR1020190154079 discloses a burn-in test apparatus in which a circulating part is provided between burn-in boards disposed in the burn-in chamber to appropriately distribute hot air flowing into the burn-in body. The present invention relates to an apparatus for reducing the temperature of a burn-in test apparatus, thereby causing a temperature deviation of a burn-in test.
The above technologies all focus on improving the hardware of the heating system of the burn-in test box, and rarely research on the control method, and patent CN202010713927.5 discloses a method for controlling burn-in temperature, a clamp, a device and a system for burn-in test, which accurately control the burn-in temperature of a single device to be tested in the burn-in test process, and the method includes: acquiring a temperature measured value and a set value of a device to be measured; control parameters for heating the device under test are adjusted based on the temperature measurement and the set point. The method for controlling the aging temperature can be realized by the fixture, the equipment and the system for aging test provided by the embodiment of the invention. Compared with the prior art, the technical scheme provided by the embodiment of the invention can realize the accurate control of the burn-in temperature of the single device to be tested in the burn-in test process. But this patent discloses controlling the temperature of individual electronic components.
Therefore, the prior art mostly improves the aging test box, and realizes hardware improvement of the heating system to realize constant and uniform temperature in the test box. However, according to the experience of the applicant for many years, for temperature control, the temperature in the test chamber is mostly detected, and when the temperature is lower than a set value, a heating system is started to compensate the heating of the test chamber, but when the temperature is lower than a value needing compensation, the temperature in the test chamber is not in the temperature range required by the test, so that the temperature in the aging test chamber can not meet the test requirement in the whole test process.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a heating power determination method, a temperature control method and a program for aging temperature control. The invention is realized by the following steps:
a heating power determination method for aging temperature control comprises the following steps:
s10, setting the aging temperature T aim And under the condition that the opening degree of the door of the aging test box is the same each time, testing the temperature change value of the temperature field in the aging test box corresponding to different door opening time t
；
，t max Setting the maximum door opening time;
s20, changing the temperature value obtained in the step S10
Performing linear fitting with different door opening times t to obtain a linear correlation value k;
s30, determining the temperature compensation power P when the door is opened according to the following formula:
where c is the specific heat capacity and m is the mass of air in the test chamber.
Further, S10 further includes: order to
And the temperature change value of the temperature field in the aging test box corresponding to different door opening times t under a plurality of temperatures in the experiment
；
the step S20 further comprises: the temperature change values at a plurality of temperatures obtained in step S10
Linear fitting is carried out with different door opening time t to obtain a linear correlation value
Obtaining the linear correlation value corresponding to the temperature T of the aging test chamber
；
S30, further comprising: when the door is opened, the current temperature in the aging test box is firstly obtained
According to the linear correlation value corresponding to the temperature T of the aging test box obtained in the step S20
Obtaining the current temperature
Corresponding linear correlation value
Determining the temperature compensation power P when the door is opened:
wherein c is the specific heat capacity, m is the mass of air in the test chamber,
is to set the aging temperature T aim With the current temperature
The temperature difference of (a) is small,
is the average door open time at the time of sampling.
Further, an interpolation calculation method is adopted to obtain a linear correlation value corresponding to the temperature T of the aging test box according to the step S20
Obtaining the current temperature
Corresponding linear correlation value
。
The invention also provides a method for controlling the aging temperature, which comprises the following steps:
C10. receiving a door opening instruction, and calculating the temperature compensation power P by adopting the heating power determination method for the aging temperature control;
C20. sending a signal for allowing the door to be opened, and when the door is detected, opening a heating system, and performing temperature compensation according to the temperature compensation power P calculated in the step C10;
C30. and when the door of the aging test box is detected to be closed, closing the heating system.
Further, the step C10 also includes obtaining the current temperature in the aging test chamber
And calculates the temperature compensation power P from the current temperature value as previously described.
Further, step C30 is followed by step C40: obtaining a current temperature within a burn-in test cell
When is coming into contact with
When the temperature is high, a heating system is turned on for heating; when in use
When the temperature is high, the heating system is closed;
to set a minimum value for the aging temperature.
Further, when the set time period is detected
If the number of door opening times exceeds the set number, the calculated temperature compensation power is multiplied by a compensation coefficient
As the power value of the heating system when the door is opened,
。
further, when the door opening time is detected to exceed the set door opening time, the calculated temperature compensation power is multiplied by a compensation coefficient
，
And adjusting the heating power after the set door opening time.
Further, when the door opening time is detected to exceed the set door opening time, the current temperature in the aging test box is obtained again
And recalculating the temperature compensation power P and adjusting the heating power after the set door opening time.
The invention also provides a computer program for executing a sophisticated temperature control method as described above.
Compared with the prior art, the heating power determination method, the temperature control method and the program for aging temperature control at least have the following beneficial effects:
(1) According to the invention, through reasonable assumptions and experimental and theoretical deduction, the heating power required for temperature compensation during opening the door under specific conditions is calculated, and the heat dissipated just due to opening the door can be compensated by performing temperature compensation according to the power;
(2) The temperature control method of the invention is to compensate the temperature while opening the door, and will not cause any adverse effect (for example, when the detected temperature is lower than the set value, the temperature compensation is carried out again (has hysteresis, and often does not meet the test condition), the temperature compensation is carried out first (the temperature in the test box can exceed the temperature condition required by the test);
(3) The invention makes extra temperature compensation under the condition that the temperature in the test box does not reach the temperature required by the test when the door is opened, so that the temperature control is more accurate;
(4) Under special conditions, such as more door opening times in a short time or over long time of single door opening, the temperature compensation power is corrected, so that the temperature control is more accurate;
(5) Finally, the temperature compensation is further carried out on the condition that the temperature in the test box does not reach the required test temperature after the temperature compensation is carried out when the door is opened, so that the temperature in the test box reaches the temperature required by the test, and the temperature in the whole aging test process is stabilized at the temperature required by the test to the maximum extent.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention or in the description of the prior art will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a heating power determination method for aging temperature control according to embodiment 1 of the present invention;
FIG. 2 is a heating power determination method for aging temperature control according to embodiment 2 of the present invention;
FIG. 3 is a method for controlling aging temperature according to embodiment 3 of the present invention;
fig. 4 is a method for controlling aging temperature according to embodiment 4 of the present invention.
Detailed Description
The following description provides many different embodiments, or examples, for implementing different features of the invention. The particular examples set forth below are illustrative only and are not intended to be limiting.
In the prior art, the temperature control in the aging test box adopts a post-compensation mode, namely when the temperature in the test box is detected to be lower than the temperature required by the test, a heating system is started to heat for temperature compensation. However, when the door is opened for sampling in the test process, the test requirement is often not met when the detected temperature is lower than the temperature required by the test, and the temperature compensation method in the prior art cannot make the temperature in the test chamber always within the required temperature range. Based on the above, the invention is conceived in the aging test process, when the electronic component is found to be damaged, the temperature in the aging test box is already in a stable state and meets the test requirement, when the door is opened for sampling, the heat in the test box is dissipated to the outside of the test box when the door is opened, and the dissipated heat is the heat Q to be compensated, so theoretically, the temperature in the test box can still be maintained to be stable when the door is opened by directly providing corresponding power compensation when the door is opened.
According to the formula:
it can be seen that a compensating heating power is required
Wherein c is the specific heat capacity, m is the mass of air in the test chamber,
is the temperature variation and t is the door opening time.
At the same time, becauseThe sampling is completed in a short time range, and according to the practical experience of the applicant, the temperature variation after the door is opened is almost in direct proportion to the door opening time in a short time, namely
，kIs a linear correlation value, i.e., a scaling factor.
Thereby obtaining the heating power for temperature compensation when opening the door
。
Based on the concept, the invention firstly needs to determinekThe heating power when the door is opened is determined, and after the heating power is determined, the heating power is executed to carry out temperature compensation on the test box when the door is opened. As shown in detail below.
Example 1
A method for determining heating power for aging temperature control, as shown in fig. 1, comprises the steps of:
s10, setting the aging temperature T aim Under the condition that the opening degree of the door of the aging test box is the same each time, measuring the temperature change value delta T of the temperature field in the aging test box corresponding to different door opening time T through tests;
，t max setting the maximum door opening time;
in the aging test process, when the electronic components are found to be damaged due to aging, the temperature in the ordinary aging test box reaches a stable value, so that in the embodiment, the set aging temperature T is directly used aim Performing a test, collecting the temperature change value delta T of the temperature field in the aging test box corresponding to different door opening time T at the set temperature, and searching for the aging temperature T at the set temperature aim Is as followskThe value is obtained.
In order to control the test variable, the opening degree of the door of the aging test box is required to be set to be the same every time, namely, when the door is opened, the heat transfer areas of the aging test box conducting heat outwards are the same, and further the test error is reduced.
As mentioned above, the invention assumes that the sampling time of each door opening is relatively short, and the temperature change value Delta T after the door opening is in direct proportion to different door opening times T within the short door opening time range, so that the set maximum door opening time T can be understood by those skilled in the art max It is reasonable to use, it cannot be too large, otherwise the error of k value after fitting according to step S20 is large, and the time required for the test of step S10 is also long.
Those skilled in the art can understand that in step S10, a plurality of door opening times t need to be taken, and when the values of the door opening times t are more, the accuracy after fitting is higher, and those skilled in the art can determine the sampling number by comprehensively considering the time and the accuracy required by the test. However, in order to ensure the test accuracy, the time interval for opening the door each time should be as large as possible, and the temperature in the aging test chamber is at the aging temperature T aim Then, the next door opening test is performed.
S20, performing linear fitting on the temperature change value delta T obtained in the step S10 and different door opening times T to obtain a linear correlation value k;
s30, determining the temperature compensation power P when the door is opened according to the following formula:
where c is the specific heat capacity and m is the mass of air in the test chamber.
From this, can confirm the heating power value that needs carry out the required heating system who opens of temperature compensation when opening the door, carry out temperature compensation according to this power, can compensate the heat because of opening the door and losing in theory, and then can not cause the cooling in the burn-in test box because of opening the door and the temperature in the test box is less than the temperature value that experimental required.
Example 2
Example 1 is a method for determining the compensation power when the door needs to be opened for sampling in the case where the burn-in test chamber temperature has stabilized. In the test process, if the door is opened and the temperature in the box is not stabilized at the set aging temperature, electronic components need to be taken out of the test box, and at the moment, if the heating power for compensation is determined according to the method of the embodiment 1, the possible compensated heat is not accurate.
Thus, this example 2 establishes different temperatures T
And the value is used for providing reference for temperature compensation when the door is opened at different temperatures in the refrigerator, and meanwhile, the difference value between the detected temperature value and the set aging temperature is compensated to a certain degree.
Specifically, the present embodiment also provides a heating power determination method for aging temperature control, as shown in fig. 2, including the following steps:
s10, under the condition that the opening degree of the door of the aging test box is the same each time, enabling the aging test box to be opened
The temperature change value delta T of the temperature field in the aging test box corresponding to different door opening time T is tested at a plurality of temperatures;
，t max setting the maximum door opening time;
S20, carrying out linear fitting on the temperature change value delta T and different door opening time T under the plurality of temperatures obtained in the step S10 to obtain linear correlation values
Obtaining the linear correlation value corresponding to the temperature T of the aging test chamber
(ii) a The linear correlation values at a plurality of temperatures T of the experiment can be obtained through the step S20
I.e. one linear correlation value for each temperature T
Forming a sample library;
s30, when the door is opened, the current temperature in the aging test box is obtained firstly
According to the linear correlation value corresponding to the aging test box temperature T obtained in the step S20
Obtaining the current temperature
Corresponding linear correlation value
Determining the temperature compensation power P when the door is opened:
wherein c is the specific heat capacity, m is the mass of air in the test chamber,
is to set the aging temperature T aim With the current temperature
The temperature difference of (a) is small,
is the average door opening time at the time of sampling.
The compensated temperature has two parts, one part is to compensate the heat dissipated when the door is opened at the current temperature
The other part is the heat quantity to be compensated for compensating the difference value between the current temperature and the set aging temperature
And because the sampling time of the door opening is uncertain, the average door opening time of one sampling is taken for calculation so as to maximally compensate the heat quantity. The average door opening time during the sampling is determined according to the characteristics of each operator, the sampling speed of some operators is higher, the average door opening time during the sampling is smaller, and the sampling speed of some operators is lower, so the average door opening time during the sampling is larger.
In the above steps, when the obtained current temperature in the aging test box
Not included in the sample library formed in step S20, preferably by interpolation from the aging test obtained in step S20Linear correlation of tank temperature T
Obtaining the current temperature
Corresponding linear correlation value
. The interpolation calculation method is a conventional calculation method in the art, and is not described herein again.
Example 3
The embodiment provides a method for controlling aging temperature, as shown in fig. 3, including the following steps:
C10. receiving a door opening instruction, and calculating temperature compensation power P by adopting the heating power determination method for the aging temperature control in the embodiment 1;
that is, the operator first needs to send a command to the control system to open the door, when the control system receives the door opening command, the control system starts to calculate the temperature compensation power P, and after the temperature compensation power P is determined, the step C20 is executed;
C20. sending a signal for allowing the door to be opened, and when the door is detected, opening a heating system, and performing temperature compensation according to the temperature compensation power P calculated in the step C10; i.e. the temperature compensation of the temperature compensation power value as determined in step C10 is performed upon opening of the door;
C30. and when the closing of the box door of the aging test box is detected, closing the heating system. Namely, the temperature compensation is finished when the door is closed.
So, carry out corresponding thermal heat compensation when opening the door, the heat that the compensation was dissipated because of opening the door can be with the temperature stability in the burn-in test box in setting for the burn-in temperature range.
Of course, since the determination of the temperature compensation power by the temperature control method of the present invention is based on some assumptions and fitting, there may be a case where the temperature in the test chamber does not reach the set aging temperature T after performing the temperature compensation by the foregoing steps aim Despite this possibilityVery low).
At this time, preferably, step C30 is followed by step C40: obtaining a current temperature within a burn-in test cell
When is coming into contact with
When the temperature is high, a heating system is turned on for heating; when in use
When the temperature is higher than the preset temperature, the heating system is closed;
to set a minimum value for the aging temperature. That is to say, when the temperature in the ageing test box is less than the minimum value of setting for the ageing temperature, control heating system heating and carry out temperature compensation, until the temperature in the ageing test box reaches and sets for the ageing temperature value.
Meanwhile, the following conditions can also exist in the aging test process, namely 1, the door is frequently opened for many times; 2. the single door opening time is long, resulting in insufficient heat compensated according to the calculated temperature compensation power. At this time, the compensated heat should be corrected.
For the case of frequent door opening for many times, when the set time period is detected
If the number of door opening times exceeds the set number, the calculated temperature compensation power is multiplied by a compensation coefficient
As the power value of the heating system when the door is opened,
. For example, when the number of door opening times in 10 minutes exceeds 4, the temperature compensation power for the door opening time in 5 th time needs to be multiplied by the calculated valueCompensation factor
. The compensation coefficient
The specific value of (a) can be determined empirically.
When the single door opening time exceeds the set door opening time, the calculated temperature compensation power is multiplied by a compensation coefficient
，
And adjusting the heating power after the set door opening time. For example, the door opening time is set to 30s, when the actual door opening time exceeds 30s, the adjusted temperature compensation power is adopted to carry out temperature compensation after the time is more than 30s, and the adjusted temperature compensation power is the calculated temperature compensation power and is multiplied by a compensation coefficient
And the compensation coefficient
The specific value of (a) can be determined empirically.
Or, when the single door opening time exceeds the set door opening time, the current temperature in the aging test box is obtained again
And the temperature compensation power P is recalculated by the method of embodiment 2, and the heating power at the time after the set door opening time is adjusted.
That is, the current temperature in the aging test chamber is obtained
The temperature of the aging test box obtained in the step S20Linear correlation value corresponding to degree T
Obtaining the current temperature
Corresponding linear correlation value
Determining the adjusted temperature compensation power P:
and the adjusted temperature compensation power is adopted to perform temperature compensation after the door opening time is set.
So, adopt the scheme of this embodiment, also carried out corresponding compensation to the more energy that causes when frequent opening the door of many times and single time open the door time longer for the temperature in the burn-in test box more can be stabilized and is being set for the burn-in temperature.
Example 4
Unlike embodiment 3, this embodiment is suitable for the aging process where the temperature in the test chamber is not stabilized to the set aging temperature T aim In the time, the situation of sampling needs to be opened, which is specifically as follows:
a method for controlling aging temperature comprises the following steps:
C10. receiving a door opening instruction, calculating temperature compensation power P by adopting the heating power determination method for the aging temperature control in the embodiment 2;
that is, the operator firstly needs to send a door opening instruction to the control system, and when the control system receives the door opening instruction, the current temperature in the aging test chamber is firstly obtained
Starting to calculate the temperature compensation power P, and executing the step C20 after determining the temperature compensation power P;
wherein c is the specific heat capacity, m is the mass of air in the test chamber,
is to set the aging temperature T aim With the current temperature
The temperature difference of (a) is small,
is the average door opening time at the time of sampling.
C20. Sending a signal for allowing the door to be opened, and when the door is detected, opening a heating system, and performing temperature compensation according to the temperature compensation power P calculated in the step C10; i.e. the temperature compensation of the temperature compensation power value as determined in step C10 is performed upon opening of the door;
C30. and when the door of the aging test box is detected to be closed, closing the heating system. Namely the temperature compensation is finished when the door is closed.
Tests prove that the temperature control method can maintain the temperature in the aging test box to be stable at the temperature value required by the test by adopting the heating power determination method for aging temperature control.
The present invention also provides a computer program for executing a burn-in temperature control method as described in embodiment 3 and/or embodiment 4. The computer program includes computer program code that executes the aging temperature control method of embodiment 3 and/or embodiment 4.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A heating power determination method for aging temperature control is characterized by comprising the following steps:
s10, setting the aging temperature T aim And under the condition that the opening degrees of the doors of the aging test box are the same each time, the temperature change values of the temperature fields in the aging test box corresponding to different door opening times T are tested and determined at a plurality of temperatures T
；
，t max In order to set the maximum door opening time,
，
respectively at a set minimum temperature and a set maximum temperature, and
；
s20, changing values of the temperature under the plurality of temperatures obtained in the step S10
Linear fitting is carried out with different door opening time t to obtain a linear correlation value
Thus obtaining the aging test boxLinear correlation of temperature T
；
S30, when the door is opened, the current temperature in the aging test box is obtained firstly
According to the linear correlation value corresponding to the aging test box temperature T obtained in the step S20
Obtaining the current temperature
Corresponding linear correlation value
Determining the temperature compensation power P when the door is opened:
wherein c is the specific heat capacity, m is the mass of air in the test chamber,
is to set the aging temperature T aim With the current temperature
The temperature difference of (a) is set,
is flat when samplingThe door opening time is equal.
2. The method for determining heating power of aging temperature control as claimed in claim 1, wherein the linear correlation value corresponding to the aging test chamber temperature T obtained in step S20 is calculated by interpolation
Obtaining the current temperature
Corresponding linear correlation value
。
3. A method for controlling aging temperature is characterized by comprising the following steps:
C10. receiving a door opening instruction, calculating a temperature compensation power P by using a heating power determination method for aging temperature control according to claim 1;
C20. sending a signal for allowing the door to be opened, and when the door is detected, opening a heating system, and performing temperature compensation according to the temperature compensation power P calculated in the step C10;
C30. and when the door of the aging test box is detected to be closed, closing the heating system.
4. The aging temperature control method according to claim 3, wherein the linear correlation value corresponding to the temperature T of the aging test chamber obtained in the step S20 is calculated by interpolation
Obtaining the current temperature
Corresponding linear correlation value
。
5. The aging temperature control method according to claim 4, further comprising, after the step C30, a step C40 of: obtaining a current temperature within a burn-in test cell
When is coming into contact with
When the temperature is high, a heating system is turned on for heating; when in use
When the temperature is high, the heating system is closed;
to set a minimum value for the aging temperature.
6. A process of aging temperature control according to any of claims 3-5, characterized in that when a set period of time is detected
If the number of door opening times exceeds the set number, the calculated temperature compensation power is multiplied by a compensation coefficient
As the power value of the heating system when the door is opened,
。
7. a process temperature control according to any of claims 3 to 5, wherein the door open time is detected to exceed a set door open time, and wherein the control is performed in the event that the door open time exceeds the set door open timeThe calculated temperature compensation power is multiplied by a compensation coefficient
，
And adjusting the heating power after the set door opening time.
8. A process temperature control method according to any one of claims 3 to 5, characterized in that, when it is detected that the door opening time exceeds the set door opening time, the current temperature in the process test chamber is retrieved
And recalculating the temperature compensation power P and adjusting the heating power after the set door opening time.
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| JP2010286195A (en) * | 2009-06-12 | 2010-12-24 | Mitsubishi Electric Corp | Heating cooker |
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