CN102681574A - System and method for controlling constant temperature and humidity machine - Google Patents
System and method for controlling constant temperature and humidity machine Download PDFInfo
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- CN102681574A CN102681574A CN2011100644791A CN201110064479A CN102681574A CN 102681574 A CN102681574 A CN 102681574A CN 2011100644791 A CN2011100644791 A CN 2011100644791A CN 201110064479 A CN201110064479 A CN 201110064479A CN 102681574 A CN102681574 A CN 102681574A
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Abstract
The invention provides a system for controlling a constant temperature and humidity machine, which operates in an electronic device. The system comprises a data reading module, a calculating module, a temperature detecting module and a control module, wherein the data reading module is used for reading a target temperature T0 set by a user during starting the constant temperature and humidity machine as well as a current temperature T and a current humidity RH of an internal environment of the constant temperature and humidity machine; the calculating module is used for calculating a current dew-point temperature Td of the internal air of the constant temperature and humidity machine according to the current temperature T and the current humidity RH; the temperature detecting module is used for detecting a surface temperature T1 of an article to be detected in the constant temperature and humidity machine in real time; and the control module is used for controlling the constant temperature and humidity machine according to the surface temperature T1, the target temperature T0 and the current dew-point temperature Td. The invention further provides a method for controlling the constant temperature and humidity machine. According to the invention, problem that condensed water is generated at the surface of the article to be detected because the surface temperature of the article to be detected cannot rise in real time can be solved.
Description
Technical field
The present invention relates to a kind of system and method for controlling constant temperature and humidity machine.
Background technology
Constant temperature and humidity machine is a kind of equipment common in the laboratory, and fundamental purpose is to let the experimenter can freely control temperature and humidity in the local space, to create experiment or to test required condition.For the environmental testing and reliability test of determinands such as electronic product, the equipment that constant temperature and humidity machine is indispensable especially.
When electronic product is tested, need test in hot environment and low temperature environment electronic product usually.When electronic product being carried out the hot environment test, the situation of high temperature can appear rising to from low temperature in electronic product.When electronic product is got back to hot environment by low temperature environment; Because the temperature of constant temperature and humidity machine inner air rises very fast; And the surface temperature of electronic product (the especially bigger electronic product of structure) often can't rise in real time, can make the surface temperature of electronic product be lower than the dewpoint temperature of constant temperature and humidity machine inner air.Thereby possibly cause the vaporous water in the constant temperature and humidity machine inner air when touching electronic product surperficial, to become condensate, and be attached on the electronic product.If there is condensate to be attached on the electronic product, may causes electronic product that electrical short circuit takes place, and then electronic product is caused damage.
Summary of the invention
In view of above content, be necessary to provide a kind of system that controls constant temperature and humidity machine, it can be controlled constant temperature and humidity machine, produces condensate with the surface that prevents determinand in the constant temperature and humidity machine.
Also be necessary to provide a kind of method of controlling constant temperature and humidity machine, it can prevent that the determinand surface in the constant temperature and humidity machine from producing condensate.
The system of said control constant temperature and humidity machine runs in the electronic installation, and this electronic installation is connected with this constant temperature and humidity machine and a Temperature Detector electronics, and this Temperature Detector is used for detecting the surface temperature of the determinand of constant temperature and humidity machine.This system comprises: data read module is used to read the target temperature T0 that the user is provided with and the Current Temperatures T and the current humidity RH of this constant temperature and humidity machine internal environment when starting constant temperature and humidity machine; Computing module is used for calculating according to said Current Temperatures T and current humidity RH the current dewpoint temperature Td of constant temperature and humidity machine inner air; Temperature detecting module is used for detecting in real time through said Temperature Detector the surface temperature T1 of determinand, and judges whether this surface temperature T1 has reached said target temperature T0; Control module; Be used for when said surface temperature T1 does not reach said target temperature T0; Judge that whether this surface temperature T1 is less than a said current dewpoint temperature Td and a predetermined temperature Tp sum; And during less than said current dewpoint temperature Td and said predetermined temperature Tp sum, send first steering order to constant temperature and humidity machine in said surface temperature T1, control this constant temperature and humidity machine and stop to heat up; Make the environment temperature in this constant temperature and humidity machine maintain said Current Temperatures T; Or during more than or equal to said current dewpoint temperature Td and said predetermined temperature Tp sum, send second steering order to constant temperature and humidity machine in said surface temperature T1, control this constant temperature and humidity machine and continue to heat up.
The method of said control constant temperature and humidity machine is applied in the electronic installation, and this electronic installation is connected with this constant temperature and humidity machine and a Temperature Detector electronics, and this Temperature Detector is used for detecting the surface temperature of the determinand of constant temperature and humidity machine.This method comprises: (a) read the target temperature T0 that the user is provided with when starting constant temperature and humidity machine; (b) read the Current Temperatures T and the current humidity RH of constant temperature and humidity machine internal environment; (c) calculate the current dewpoint temperature Td of constant temperature and humidity machine inner air according to said Current Temperatures T and current humidity RH; (d) detect the surface temperature T1 of determinand in real time through said Temperature Detector; And judge whether this surface temperature T1 has reached said target temperature T0; If this surface temperature T1 does not reach said target temperature T0; Execution in step (e) is if this surface temperature T1 has reached said target temperature T0, execution in step (h); (e) judge that whether said surface temperature T1 is less than a said current dewpoint temperature Td and a predetermined temperature Tp sum; (f) if said surface temperature T1 less than said current dewpoint temperature Td and said predetermined temperature Tp sum; Send first steering order to constant temperature and humidity machine; Control this constant temperature and humidity machine and stop to heat up, make the environment temperature in this constant temperature and humidity machine maintain said Current Temperatures T, return step (d); (g) if said surface temperature T1 more than or equal to said current dewpoint temperature Td and said predetermined temperature Tp sum, sends second steering order to constant temperature and humidity machine, control this constant temperature and humidity machine and continue to heat up, return step (b); (h) send the 3rd steering order to constant temperature and humidity machine, control constant temperature and humidity machine prompting user has accomplished the warming temperature to determinand.
Compared to prior art; The system and method for said control constant temperature and humidity machine; Can rise in the process of high temperature by low temperature in the constant temperature and humidity machine internal environment; Effectively solve surface temperature because of determinand and can not rise in real time and cause producing the problem of condensate, thereby play the effect that determinand is protected on the surface of this determinand.Simultaneously, can practice thrift also that the tester is dried constant temperature and humidity machine and the running time of thermal equilibrium etc., make test quick, safe and effectively to carry out.
Description of drawings
Fig. 1 is the synoptic diagram that constant temperature and humidity machine is connected with electronic installation in the preferred embodiment of the present invention.
Fig. 2 is the Organization Chart of electronic installation in the preferred embodiment of the present invention.
Fig. 3 is the process flow diagram that the present invention controls the method for constant temperature and humidity machine.
The main element symbol description
| Electronic installation | 1 |
| Constant temperature and |
2 |
| Determinand | 3 |
| |
4 |
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10 |
| Data read |
101 |
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102 |
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103 |
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104 |
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11 |
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12 |
Following embodiment will combine above-mentioned accompanying drawing to further specify the present invention.
Embodiment
As shown in Figure 1, be the synoptic diagram that constant temperature and humidity machine is connected with electronic installation in the preferred embodiment of the present invention.Electronic installation 1 is connected with constant temperature and humidity machine 2 and Temperature Detector 4 electronics.Temperature Detector 4 is placed on the surface of determinand 3 in the constant temperature and humidity machine 2, through detecting the surface temperature of this determinand 3 with the mode that directly contacts of surface of this determinand 3.This Temperature Detector 4 can be an analog temperature sensor, like thermopair, thermal resistance etc., also can be digital temperature sensor.Determinand 3 can be various electronic products to be measured.In the present embodiment, electronic installation 1 can communicate with constant temperature and humidity machine 2 through the RS232 interface and be connected, so that carry out data communication with constant temperature and humidity machine 2.
As shown in Figure 2, be the Organization Chart of electronic installation in the preferred embodiment of the present invention.This electronic installation 1 comprises system 10 (calling " control system 10 " in the following text), storage medium 11 and the microprocessor 12 of controlling constant temperature and humidity machine 2.Said control system 10 comprises data read module 101, computing module 102, temperature detecting module 103 and control module 104.The data read module 101 that this control system 10 comprised, computing module 102, temperature detecting module 103 and control module 104 are for having the software program section of specific function; This software program section is stored in the said storage medium 11; And by said microprocessor 12 execution, to realize the control of the present invention to constant temperature and humidity machine 2.
Said data read module 101 is used to read the target temperature T0 of user's setting when starting constant temperature and humidity machine 2 and the Current Temperatures T and the current humidity RH of this constant temperature and humidity machine 2 internal environments.Said target temperature T0 is user when said determinand 3 is tested, the temperature that this determinand 3 need reach, and the required temperature of keeping of the internal environment of this constant temperature and humidity machine 2.Particularly, this data read module 101 can use the RS232 order to carry out data communication with constant temperature and humidity machine 2, to read the Current Temperatures T and the current humidity RH of said target temperature T0 and constant temperature and humidity machine 2 internal environments.
Said computing module 102 is used for calculating according to said Current Temperatures T and current humidity RH the current dewpoint temperature Td of constant temperature and humidity machine 2 inner airs.
So-called dewpoint temperature is meant at fixed air to be depressed, and contained vaporous water reaches capacity and condenses into the required temperature of reducing to of aqueous water in the air.Therefore, when the surface temperature of said determinand 3 is lower than the dewpoint temperature of constant temperature and humidity machine 2 inner airs, the surface that the vaporous water in these constant temperature and humidity machine 2 inner airs can condense into aqueous water and be attached to this determinand 3 when touching determinand 3 surperficial.
Particularly, computing module 102 can use dewpoint temperature to calculate the current dewpoint temperature Td that formula calculates constant temperature and humidity machine 2 inner airs.The formula that calculates this current dewpoint temperature Td is:
wherein; A=17.27; B=237.7 ℃,
Said temperature detecting module 103 is used for detecting the surface temperature T1 of determinand 3 in real time through said Temperature Detector 4, and judges whether this surface temperature T1 has reached said target temperature T0.
When said surface temperature T1 did not reach said target temperature T0, said control module 104 was used to judge that whether this surface temperature T1 is less than a said current dewpoint temperature Td and a predetermined temperature Tp sum.This predetermined temperature Tp needs greater than 0 ℃, but value can not be too big, for example, and can not be above 5 ℃.
If said surface temperature T1 is less than said current dewpoint temperature Td and said predetermined temperature Tp sum; The surface temperature T1 of expression determinand 3 is soon near this current dewpoint temperature Td; If constant temperature and humidity machine 2 continues to heat up; Can cause the Current Temperatures T of constant temperature and humidity machine 2 internal environments to raise rapidly; The current dewpoint temperature Td of constant temperature and humidity machine 2 air also can correspondingly raise, and when this current dewpoint temperature Td rose to the surface temperature T1 of said determinand 3, the surface of this determinand 3 then may produce condensate because said surface temperature T1 is less than or equal to said current dewpoint temperature Td.Therefore; As said surface temperature T1 during less than said current dewpoint temperature Td and said predetermined temperature Tp sum; Control module 104 is sent first steering order to constant temperature and humidity machine 2, controls this constant temperature and humidity machine 2 and stops to heat up, and makes the environment temperature in this constant temperature and humidity machine 2 maintain Current Temperatures T.
When the environment temperature in the constant temperature and humidity machine 2 maintains said Current Temperatures T; The surface temperature T1 of determinand 3 can raise gradually; When the surface temperature T1 of this determinand 3 is increased to said current dewpoint temperature Td and said predetermined temperature Tp sum; The surface temperature T1 of expression determinand 3 does not possess the condition that produces condensate on the surface of determinand 3 still greater than said current dewpoint temperature Td certain distance.Therefore, as said surface temperature T1 during more than or equal to said current dewpoint temperature Td and said predetermined temperature Tp sum, control module 104 is sent second steering order to constant temperature and humidity machines 2, controls this constant temperature and humidity machine 2 and continues to heat up.What this place should be explained is, because the user has set said target temperature T0, so constant temperature and humidity machine 2 is when heating up, and the environment temperatures in this constant temperature and humidity machine 2 can not surpass said target temperature T0.
In addition; When the surface temperature T1 of determinand 3 reaches said target temperature T0; Control module 104 is sent the 3rd steering order to constant temperature and humidity machine 2, and control constant temperature and humidity machine 2 prompting users have accomplished the warming temperature to determinand 3, so that the user carries out next step test.
As shown in Figure 3, be the process flow diagram that the present invention controls the method for constant temperature and humidity machine.
Step S01, said data read module 101 read the target temperature T0 that the user is provided with when starting constant temperature and humidity machine 2.
Step S02, said data read module 101 read the Current Temperatures T and the current humidity RH of constant temperature and humidity machine 2 internal environments.
Step S03, said computing module 102 calculate the current dewpoint temperature Td of constant temperature and humidity machine 2 inner airs according to said Current Temperatures T and current humidity RH.In the present embodiment, computing module 102 can use the formula that calculates dewpoint temperature to calculate the current dewpoint temperature Td of constant temperature and humidity machine 2 inner airs.The formula that calculates this current dewpoint temperature Td is:
wherein; A=17.27; B=237.7 ℃,
Step S04, temperature detecting module 103 detects the surface temperature T1 of determinand 3 in real time through said Temperature Detector 4.And in step S05, this temperature detecting module 103 judges whether this surface temperature T1 has reached said target temperature T0.If this surface temperature T1 has reached said target temperature T0, execution in step S09.If this surface temperature T1 does not reach this target temperature T0, execution in step S06.
Step S06, said control module 104 judges that whether said surface temperature T1 is less than a said current dewpoint temperature Td and a predetermined temperature Tp sum.If this surface temperature T1 is less than said current dewpoint temperature Td and said predetermined temperature Tp sum, execution in step S07.If this surface temperature T1 is more than or equal to said current dewpoint temperature Td and said predetermined temperature Tp sum, execution in step S08.
Step S07, said control module 104 is sent first steering order to constant temperature and humidity machine 2, controls this constant temperature and humidity machine 2 and stops to heat up, and makes the environment temperature in this constant temperature and humidity machine 2 maintain said Current Temperatures T, returns step S04.
Step S08, said control module 104 is sent second steering order to constant temperature and humidity machine 2, controls this constant temperature and humidity machine 2 and continues to heat up, and returns step S02.
Step S09, said control module 104 is sent the 3rd steering order to constant temperature and humidity machine 2, and control constant temperature and humidity machine 2 prompting users have accomplished the warming temperature to determinand 3, so that the user carries out next step test operation.
In sum; The present invention can monitor the current dewpoint temperature Td of constant temperature and humidity machine 2 inner airs and the surface temperature T1 of determinand 3 in real time; As the surface temperature T1 of determinand 3 during near this current dewpoint temperature Td; Control constant temperature and humidity machine 2 stops to heat up, and raises with the current dewpoint temperature Td that prevents these constant temperature and humidity machine 2 inner airs, thereby avoids producing condensate on the surface of determinand 3.After the surface temperature T1 of determinand 3 is increased to a certain degree, controls constant temperature and humidity machine 2 again and heat up.Therefore, embodiment of the present invention can solve surface temperature T1 because of determinand 3 and can not rise in real time and cause producing on the surface of this determinand 3 problem of condensate.
Above embodiment is only unrestricted in order to technical scheme of the present invention to be described; Although the present invention is specified with reference to preferred embodiment; Those of ordinary skill in the art is to be understood that; Can make amendment or be equal to replacement technical scheme of the present invention, and not break away from the spirit and the scope of technical scheme of the present invention.
Claims (7)
1. method of controlling constant temperature and humidity machine; Be applied in the electronic installation, this electronic installation is connected with this constant temperature and humidity machine and a Temperature Detector electronics, and this Temperature Detector is used for detecting the surface temperature of the determinand of constant temperature and humidity machine; It is characterized in that this method comprises:
(a) read the target temperature T0 that the user is provided with when starting constant temperature and humidity machine;
(b) read the Current Temperatures T and the current humidity RH of constant temperature and humidity machine internal environment;
(c) calculate the current dewpoint temperature Td of constant temperature and humidity machine inner air according to said Current Temperatures T and current humidity RH,
(d) detect the surface temperature T1 of determinand in real time through said Temperature Detector; And judge whether this surface temperature T1 has reached said target temperature T0; If this surface temperature T1 does not reach said target temperature T0; Execution in step (e) is if this surface temperature T1 has reached said target temperature T0, execution in step (h);
(e) judge that whether said surface temperature T1 is less than a said current dewpoint temperature Td and a predetermined temperature Tp sum;
(f) if said surface temperature T1 less than said current dewpoint temperature Td and said predetermined temperature Tp sum; Send first steering order to constant temperature and humidity machine; Control this constant temperature and humidity machine and stop to heat up, make the environment temperature in this constant temperature and humidity machine maintain said Current Temperatures T, return step (d);
(g) if said surface temperature T1 more than or equal to said current dewpoint temperature Td and said predetermined temperature Tp sum, sends second steering order to constant temperature and humidity machine, control this constant temperature and humidity machine and continue to heat up, return step (b);
(h) send the 3rd steering order to constant temperature and humidity machine, control constant temperature and humidity machine prompting user has accomplished the warming temperature to determinand.
2. the method for control constant temperature and humidity machine as claimed in claim 1 is characterized in that, said current dewpoint temperature Td calculates through following formula:
3. the method for control constant temperature and humidity machine as claimed in claim 1 is characterized in that, said predetermined temperature Tp is less than or equal to 5 ℃ greater than 0 ℃.
4. system that controls constant temperature and humidity machine; Run in the electronic installation, this electronic installation is connected with this constant temperature and humidity machine and a Temperature Detector electronics, and this Temperature Detector is used for detecting the surface temperature of the determinand of constant temperature and humidity machine; It is characterized in that this system comprises:
Data read module is used to read the target temperature T0 that the user is provided with and the Current Temperatures T and the current humidity RH of this constant temperature and humidity machine internal environment when starting constant temperature and humidity machine;
Computing module is used for calculating according to said Current Temperatures T and current humidity RH the current dewpoint temperature Td of constant temperature and humidity machine inner air;
Temperature detecting module is used for detecting in real time through said Temperature Detector the surface temperature T1 of determinand, and judges whether this surface temperature T1 has reached said target temperature T0; And
Control module; Be used for when said surface temperature T1 does not reach said target temperature T0; Judge that whether this surface temperature T1 is less than a said current dewpoint temperature Td and a predetermined temperature Tp sum; And during less than said current dewpoint temperature Td and said predetermined temperature Tp sum, send first steering order to constant temperature and humidity machine in said surface temperature T1, control this constant temperature and humidity machine and stop to heat up; Make the environment temperature in this constant temperature and humidity machine maintain said Current Temperatures T; Or during more than or equal to said current dewpoint temperature Td and said predetermined temperature Tp sum, send second steering order to constant temperature and humidity machine in said surface temperature T1, control this constant temperature and humidity machine and continue to heat up.
5. the system of control constant temperature and humidity machine as claimed in claim 4; It is characterized in that; When said surface temperature T1 reaches said target temperature T0; Said control module also is used to send the 3rd steering order to constant temperature and humidity machine, and control constant temperature and humidity machine prompting user has accomplished the warming temperature to determinand.
6. the system of control constant temperature and humidity machine as claimed in claim 4 is characterized in that, said current dewpoint temperature Td calculates through following formula:
7. the system of control constant temperature and humidity machine as claimed in claim 4 is characterized in that, said predetermined temperature Tp is less than or equal to 5 ℃ greater than 0 ℃.
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| CN103292448A (en) * | 2013-05-30 | 2013-09-11 | 华为技术有限公司 | Method and device for preventing condensation of refrigerating device |
| CN105094183A (en) * | 2015-07-24 | 2015-11-25 | 比赫电气（太仓）有限公司 | Medical nuclear magnetic resonance water chilling unit control system |
| CN111637545A (en) * | 2020-05-29 | 2020-09-08 | 深圳市康贝电子有限公司 | Humidity calibration method, calibration module and dehumidifier |
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Application publication date: 20120919 |