CN114893972B - Dehumidification system of power module and control method - Google Patents
Dehumidification system of power module and control method Download PDFInfo
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- 238000007791 dehumidification Methods 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000012360 testing method Methods 0.000 claims abstract description 151
- 238000001035 drying Methods 0.000 claims abstract description 101
- 230000000903 blocking effect Effects 0.000 claims abstract description 37
- 230000002159 abnormal effect Effects 0.000 claims abstract description 27
- 230000003068 static effect Effects 0.000 claims abstract description 18
- 230000007613 environmental effect Effects 0.000 claims description 20
- 238000012544 monitoring process Methods 0.000 claims description 6
- 230000000007 visual effect Effects 0.000 claims 1
- 238000001514 detection method Methods 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000000306 component Substances 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012806 monitoring device Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/08—Humidity
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- Engineering & Computer Science (AREA)
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- Drying Of Gases (AREA)
Abstract
The application provides a dehumidification system and a control method of a power module, which relate to the technical field of dehumidification of the power module and comprise the following steps: an environment bin which is internally provided with a drying/dehumidifying device; the controller is integrated with the environment bin and controls the drying/dehumidifying device to work; the testing module is used for carrying out static parameter testing on the power module to be dehumidified at preset time intervals; the static parameter test comprises a blocking voltage test and a leakage current test, and a test result is fed back to the controller; when the test module detects abnormal blocking voltage test and/or leakage current test, the controller controls the drying/dehumidifying device to continue to work, otherwise, the drying/dehumidifying device is controlled to stop working, and the problem that the current dehumidification process of the power module is easy to cause incomplete drying/excessive drying, thereby influencing the electrical characteristics of the power module is solved.
Description
Technical Field
The application relates to the technical field of dehumidification of power modules, in particular to a dehumidification system of a power module and a control method.
Background
Along with the development of the power electronic technology, the energy storage converter is developed towards the direction of integration and modularization, and the power module is used as a core component of the energy storage converter, so that the power module not only has the characteristics of high stability, high reliability and the like, but also meets the practical application requirements of simple and light structure, convenient installation and maintenance and the like.
Before the power module is used, reliability detection needs to be carried out, multiple detection needs to be carried out before and after the power module is used, a part of detection process needs to be completed under water, for example, ultrasonic scanning is used for scanning whether a leak exists at the bottom of the power module when the power module is soaked in water, the power module needs to be taken out from water and dehumidified after scanning is completed, the moisture in the power module is generally removed in a drying mode, the existing automatic dehumidification device/system generally presets dehumidification time, but due to the fact that the situation of residual moisture in the power module cannot be accurately known, incomplete drying/excessive drying often occurs, and the electrical characteristics of the power module are affected.
Disclosure of Invention
In order to overcome the technical defects, the application aims to provide a dehumidification system and a control method of a power module, which are used for solving the problem that incomplete drying/excessive drying easily occurs in the dehumidification process of the existing power module, and the electrical characteristics of the power module are affected.
The application discloses a dehumidification system of a power module, comprising:
the environment bin is internally provided with a drying/dehumidifying device which is used for dehumidifying the power module to be dehumidified;
the controller is integrated with the environment bin and controls the drying/dehumidifying device to work;
the testing module is used for carrying out static parameter testing on the power module to be dehumidified at preset time intervals; the static parameter test comprises a blocking voltage test and a leakage current test, and a test result is fed back to the controller;
the test module comprises:
the first test module is used for blocking voltage test, detecting real-time leakage current between a collector and an emitter of a chip in the power module to be dehumidified, gradually increasing voltage pulse stress to obtain a first voltage value when the real-time leakage current reaches a first preset value, and judging that a blocking voltage test result is abnormal when the first voltage value exceeds a first threshold range;
the second test module is used for testing leakage current, applying preset voltage pulse stress between a collector electrode and an emitter electrode of the chip in the power module to be dehumidified, detecting second leakage current under the preset voltage pulse stress, and judging that the leakage current test is abnormal when the second leakage current exceeds a second threshold range;
when the test module detects abnormal blocking voltage test and/or leakage current test, the controller controls the drying/dehumidifying device to continue to work, otherwise, the controller controls the drying/dehumidifying device to stop working.
Preferably, a drainage area is arranged at the bottom of the test bin, and the drying/dehumidifying device is arranged at one side opposite to the drainage area;
and at least one humidity sensor and at least one temperature sensor are circumferentially arranged in the power module to be dehumidified in the test bin so as to collect the humidity and the temperature of the environmental bin.
Preferably, the system further comprises an acquisition module for monitoring real-time working parameters to synchronize to the controller, wherein the working parameters comprise environment bin humidity, temperature, drainage state, dehumidifying device parameters and drying/dehumidifying time.
Preferably, the device comprises a recording module, a control module and a control module, wherein the recording module is used for automatically stopping working and recording working parameters when controlling the drying/dehumidifying device;
when the dehumidification is carried out on another power module to be dehumidified, which is manufactured under the same working condition as the module to be dehumidified, the controller obtains working parameters from the recording module and automatically controls the drying/dehumidifying device to continue working or stop working according to the working parameters.
Preferably, the system further comprises a display operation screen integrated outside the environmental bin and used for visually displaying the working parameters.
Preferably, the display operation screen receives an operation instruction sent by a user through the display operation screen and sends the operation instruction to the controller, so that the controller can adjust the drying/dehumidifying device in real time according to the operation instruction.
The application also provides a dehumidification control method of the power module, which comprises the following steps:
placing the power module to be dehumidified in an environment bin, and controlling a drying/dehumidifying device in the environment bin to work by a controller;
carrying out static parameter test on the power module to be dehumidified at preset time intervals, wherein the static parameter test comprises a blocking voltage test and a leakage current test;
when a blocking voltage test is carried out, detecting real-time leakage current between a collector electrode and an emitter electrode of a chip in the power module to be dehumidified, gradually increasing voltage pulse stress to obtain a first current value when the real-time leakage current reaches a first preset value, and judging that a blocking voltage test result is abnormal when the first voltage value exceeds a first threshold range;
applying a preset voltage pulse stress between a collector electrode and an emitter electrode of a chip in the power module to be dehumidified when a leakage current test is performed, detecting a second leakage current under the preset voltage pulse stress, and judging that the leakage current test is abnormal when the second leakage current exceeds a second threshold range;
and when the blocking voltage test and/or the leakage current test are abnormal, the controller controls the drying/dehumidifying device to continue to work, otherwise, controls the drying/dehumidifying device to stop working.
Preferably, the drying/dehumidifying device is controlled to automatically stop working, and working parameters are recorded, wherein the working parameters comprise the humidity of an environment bin, the temperature, the drainage state, the dehumidifying device parameters and the drying/dehumidifying time;
obtaining another power module to be dehumidified, wherein the other power module to be dehumidified and the module to be dehumidified are manufactured and obtained under the same working condition;
and the controller automatically controls the drying/dehumidifying device to continue working or stop working according to the working parameters.
Preferably, real-time working parameters are monitored, wherein the working parameters comprise environment bin humidity, temperature, drainage state, dehumidifying device parameters and drying/dehumidifying time;
and visually displaying the working parameters through a display operation screen.
Preferably, the user sends out an operation instruction through the display operation screen, and the controller adjusts the drying/dehumidifying device in real time according to the operation instruction.
After the technical scheme is adopted, compared with the prior art, the method has the following beneficial effects:
according to the dehumidification system and the control method, in the dehumidification process, the test module is used for conducting blocking voltage test and leakage current test on the power module to be dehumidified at preset time intervals, the dehumidification mode is automatically controlled, the dehumidification process can be monitored through real-time humidity detection, the dehumidification is automatically judged to be stopped, and the problem that the electrical characteristics of the power module are affected due to the fact that incomplete drying/excessive drying is easy to occur in the existing dehumidification process of the power module is solved.
Drawings
FIG. 1 is a hardware diagram of a dehumidification system for a power module according to an embodiment of the present disclosure;
FIG. 2 is a diagram of the internal hardware of an environmental chamber in a first embodiment of a dehumidification system for a power module in accordance with the present disclosure;
FIG. 3 is a schematic diagram of a dehumidification system for a power module according to an embodiment of the present disclosure;
fig. 4 is a flowchart of a second embodiment of a dehumidification control method of a power module according to the present application.
Reference numerals:
0-power module; 1-an environmental bin; 11-a drying/dehumidifying apparatus; 12-drainage area; 13-humidity sensor and/or temperature sensor 2-controller; 3-a test module; 31-a first test module; 32-a second test module; 4-an acquisition module; a 5-recording module; and 6, displaying an operation screen.
Detailed Description
Advantages of the application are further illustrated in the following description, taken in conjunction with the accompanying drawings and detailed description.
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present disclosure as detailed in the accompanying claims.
The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.
It should be understood that although the terms first, second, third, etc. may be used in this disclosure to describe various information, these information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure. The word "if" as used herein may be interpreted as "at … …" or "at … …" or "responsive to a determination", depending on the context.
In the description of the present application, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
In the description of the present application, unless otherwise specified and defined, it should be noted that the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, mechanical or electrical, or may be in communication with each other between two elements, directly or indirectly through intermediaries, as would be understood by those skilled in the art, in view of the specific meaning of the terms described above.
In the following description, suffixes such as "module", "component", or "unit" for representing elements are used only for facilitating the description of the present application, and are not of specific significance per se. Thus, "module" and "component" may be used in combination.
Embodiment one: the present embodiment provides a dehumidification system of a power module, specifically referring to fig. 1, fig. 2 and fig. 3, including the following steps:
the environment bin 1 is internally provided with a drying/dehumidifying device 11 for dehumidifying the power module to be dehumidified; more specifically, a working area for placing the power module is arranged in the environment bin, and the drying/dehumidifying device circumferentially surrounds the working area, so that the power module can be uniformly dehumidified when placed in the working area, and the drying/dehumidifying device can perform operations including but not limited to heating, air outlet, air return and the like.
The controller 2 is integrated with the environmental bin into a whole device and controls the drying/dehumidifying device therein to work; it should be noted that, in the present application, the mutual control between the modules or elements is implemented through electrical connection, and may also be implemented in part by the existing wireless manner, which is not specifically described herein, but it is understood that the controller may control each module (including, but not limited to, a drying/dehumidifying device, a motor for the function of the drying/dehumidifying device, etc.) and the test module described below in the environmental chamber to operate, or even be configured to receive the data fed back by the test module described below for autonomous control.
The test module 3 is used for carrying out module static parameter test on the power to be dehumidified at preset time intervals; the static parameter test comprises a blocking voltage test and a leakage current test, and a test result is fed back to the controller. It should be noted that, the testing module is disposed outside the environmental chamber, and can enable the power module to be dehumidified to move out of the environmental chamber for testing at a preset interval, and also can be directly connected with the power module to be dehumidified through a wire or other connecting devices, so as to test the power module to be dehumidified in real time, and the blocking voltage test and the leakage current test are mainly aimed at testing the chip in the power module to be dehumidified, so that the chip can be connected for testing, and dehumidification in the environmental chamber can be suspended selectively when the test is performed.
Specifically, the blocking voltage test (BV (blocking voltage) test) and the leakage current test are two different test methods, so the test module 3 includes:
the first test module 31 is configured to block voltage testing, detect a real-time leakage current between a collector and an emitter of a chip in the power module to be dehumidified, gradually increase a voltage pulse stress, so as to obtain a first voltage value when the real-time leakage current reaches a first preset value, and determine that a blocking voltage test result is abnormal when the first voltage value exceeds a first threshold range;
specifically, the IGBTs share three electrodes, namely a C-collector electrode, an E-emitter electrode and a G-grid electrode; monitoring C, E leakage current, presetting a highest upper limit value (namely a first preset value), gradually increasing the voltage pulse stress between C, E until the leakage current reaches the preset highest upper limit value (namely a first voltage value), reading the highest voltage value (namely the first voltage value), and judging that the dehumidified power module is normal if the value does not exceed a first threshold range, namely judging that the result of the blocking voltage test is normal; if the first threshold range is exceeded, the blocking voltage test result is abnormal, namely the power module still needs to continue dehumidification. The test can be regarded as a test for whether the leakage current reaches the upper voltage limit value under the stress of the voltage pulse.
A second test module 32, configured to apply a predetermined voltage pulse stress between a collector and an emitter of a chip in the power module to be dehumidified, detect a second leakage current under the predetermined voltage pulse stress, and determine that the leakage current test is abnormal when the second leakage current exceeds a second threshold range;
specifically, in the above leakage current test, a predetermined voltage pulse stress is applied between C, E, and the leakage current is monitored, if the leakage current does not exceed a limit value range (a second threshold value range) under the set voltage pulse stress, it can be determined that the dehumidified power module is normal, and if the leakage current exceeds the limit value range, it is determined that the leakage current test is abnormal; the test can be regarded as a test for whether the voltage reaches the upper limit leakage current under the voltage pulse stress normally, and it should be noted that the normal value of the first voltage value when the leakage current under the set voltage pulse stress and the real-time leakage current reach the first preset value is generally a range, so that the first threshold range and the second threshold range are adopted for representation.
When the test module detects abnormal blocking voltage test and/or leakage current test, the controller controls the drying/dehumidifying device to continue to work, otherwise, the controller controls the drying/dehumidifying device to stop working.
Specifically, when the voltage test and the leakage current test are abnormal, an abnormal command is sent to the controller to enable the drying/dehumidifying device to continue to work, when the two tests are normal, a command is sent to the controller to enable the drying/dehumidifying device to stop working, so that incomplete drying/excessive drying is avoided, and the electric characteristics of the power module are affected.
As a supplement, the above-mentioned tests are performed at preset time intervals, the blocking voltage test and the leakage current test are performed at fixed frequency, for example, after drying/dehumidifying for several minutes (10 mins), the equipment will perform a static parameter test every 15s, and when the BV value or the leakage current value is greater than or equal to 5% of the first threshold value or the second threshold value, the equipment continues to perform the drying/dehumidifying operation; when the BV value or the leakage current value is less than 5% of the first threshold value or the second threshold value, the equipment automatically stops drying/dehumidifying and sends out a 3s ending prompt tone.
In the above embodiment, as a preferred manner, the bottom of the test bin 1 is provided with a drainage area 12, so that water vapor generated in the dehumidification process is discharged from the drainage area, the influence of the accumulation in the test bin on the dehumidification effect is reduced, and the drying/dehumidifying device is arranged on the opposite side of the drainage area, so that a hot air path from the drying/dehumidifying device to the power module to be dehumidified, passing through (or surrounding) the drainage area, is formed, and the power module to be dehumidified is dehumidified; further, in order to overcome the problem that the humidity condition in the test bin cannot be accurately obtained in the existing dehumidification process, at least one humidity sensor and/or a temperature sensor 13 are arranged in the test bin in the circumferential direction of the power module to be dehumidified so as to collect the humidity and the temperature of the environmental bin, the humidity and the temperature of the environmental bin can be monitored in real time, a humidity threshold range and a temperature threshold range are set as examples, and dehumidification is automatically stopped no matter whether detection is abnormal or not when the humidity threshold range or the temperature threshold range is exceeded.
In this embodiment, the system further includes an acquisition module 4, configured to monitor real-time working parameters to synchronize to the controller, where the working parameters include ambient cabin humidity, temperature, drainage status, dehumidifier parameters and drying/dehumidifying time, specifically, the humidity sensor and/or the temperature sensor are used to acquire humidity and temperature, and after detection, data on the sensor is read in real time, the drainage status may include, but is not limited to, drainage area water level, drainage area switch opening or closing, and the like, the dehumidifier parameters include, but are not limited to, wind speed, heating temperature, and the like, the drying/dehumidifying time is calculated by starting dehumidification with the power module to be dehumidified, and is tentative when interrupting the dehumidification process of the same dehumidification power module, and is continuously timed when continuing, and timing start can be implemented according to a manual input instruction of a user, or can be autonomously determined by feedback of the controller through the test module.
In this embodiment, the dehumidification system includes a recording module 5, configured to automatically stop the operation of the drying/dehumidification device, record the operation parameters to generate a record of the mapping operation parameters of the module to be dehumidified, and, considering that a plurality of power modules are generated under the same process, in order to improve the dehumidification efficiency, when the power modules of the same type as the power module to be dehumidified are dehumidified, the dehumidification device parameters and the drying/dehumidification time and the like in the operation parameters can be directly referred to for autonomous control, so that when another power module to be dehumidified, which is manufactured under the same working condition as the power module to be dehumidified, is dehumidified, the controller obtains the operation parameters from the recording module, and automatically controls the drying/dehumidification device to continue to operate or stop operating according to the operation parameters. It should be noted that, in this embodiment, each performance of the power module manufactured and obtained under the same working condition is consistent in the current state by default, so that batch dehumidification processing of the power module can be realized under the condition of avoiding incomplete drying/excessive drying, and the working efficiency is increased.
In this embodiment, preferably, the portable environment monitoring device further comprises a display operation screen 6, which is integrated on the outer side of the environment cabin and is used for visually displaying the working parameters, a box body can be arranged and is used for integrating the environment cabin, the controller, the test module and the display operation screen, a handle can be further arranged on the portable environment monitoring device, and the display operation screen can be used for displaying the working parameters (including but not limited to temperature and humidity). Preferably, even the above adjusting interface of the drying/dehumidifying apparatus may be displayed, for user operation on the drying/dehumidifying apparatus, so that the display operation screen may further receive an operation instruction sent by a user through the display operation screen and send the operation instruction to the controller, so that the controller may adjust the drying/dehumidifying apparatus in real time according to the operation instruction, and the user may check the current state of the environmental chamber in real time through the display operation screen, and may also adjust the drying/dehumidifying apparatus in real time, so that an unexpected situation may occur and timely react, thereby increasing the safety of the working process.
In the dehumidification system in the embodiment, the power module to be dehumidified is placed in an environment bin and starts to dehumidify, the test module is used for carrying out blocking voltage test and leakage current test on the power module to be dehumidified at preset time intervals, the dehumidification mode is automatically controlled, the dehumidification process is monitored through real-time humidity detection, the dehumidification is automatically judged to be stopped, the problem that the existing power module dehumidification process is easy to occur under the condition of incomplete drying/excessive drying, and then the electrical characteristics of the power module are affected is solved.
Embodiment two: the present embodiment provides a dehumidification control method of a power module, which adopts the dehumidification system of the power module provided in the first embodiment, specifically referring to fig. 3, and includes the following steps:
s100: placing the power module to be dehumidified in an environment bin, and controlling a drying/dehumidifying device in the environment bin to work by a controller;
in the above steps, the controller may autonomously identify whether the power module to be dehumidified exists in the working area of the environmental chamber, for example, feedback data of the test module is from the main automatic dehumidification mode, or a command is sent to the controller to start the dehumidification mode through user operation.
S200: carrying out static parameter test on the power module to be dehumidified at preset time intervals, wherein the static parameter test comprises a blocking voltage test and a leakage current test;
specifically, the preset time interval may be set independently according to an actual test environment, for example, after drying/dehumidifying for several minutes (10 mins), the device may perform a static parameter test every 15s, the blocking voltage test and the leakage current test are performed by the first test module and the second test module, respectively, considering that one power module may have a plurality of chips, the two tests may be performed synchronously or sequentially on different chips, the blocking voltage test is used for testing whether the leakage current reaches the upper limit voltage value under the voltage pulse stress is normal, and the leakage current test is used for testing whether the voltage reaches the upper limit leakage current under the voltage pulse stress is normal.
S300: when a blocking voltage test is carried out, detecting real-time leakage current between a collector electrode and an emitter electrode of a chip in the power module to be dehumidified, gradually increasing voltage pulse stress to obtain a first voltage value when the real-time leakage current reaches a first preset value, and judging that a blocking voltage test result is abnormal when the first voltage value exceeds a first threshold range;
s400: applying a preset voltage pulse stress between a collector electrode and an emitter electrode of a chip in the power module to be dehumidified when a leakage current test is performed, detecting a second leakage current under the preset voltage pulse stress, and judging that the leakage current test is abnormal when the second leakage current exceeds a second threshold range;
s500: and when the blocking voltage test and/or the leakage current test are abnormal, the controller controls the drying/dehumidifying device to continue to work, otherwise, controls the drying/dehumidifying device to stop working.
In this embodiment, any one of the blocking voltage test and the leakage current test is abnormal, an abnormal command is sent to the controller, so that the drying/dehumidifying device continues to operate, and when both tests are normal, a command is sent to the controller, so that the drying/dehumidifying device stops operating, so as to avoid incomplete drying/excessive drying, and further influence the electrical characteristics of the power module.
Specifically, after the step S500, the method further includes automatically stopping the operation of the drying/dehumidifying device and recording the working parameters, wherein the working parameters include the humidity of the environmental chamber, the temperature, the drainage state, the parameters of the dehumidifying device and the drying/dehumidifying time; obtaining another power module to be dehumidified, wherein the other power module to be dehumidified and the module to be dehumidified are manufactured and obtained under the same working condition; and the controller automatically controls the drying/dehumidifying device to continue working or stop working according to the working parameters.
In this embodiment, the performances of the power modules manufactured and obtained under the same working condition are consistent in the current state by default, so that batch dehumidification processing of the power modules can be realized under the condition of avoiding incomplete drying/excessive drying, and the working efficiency is increased.
Specifically, in the above dehumidification control method, monitoring real-time working parameters including environmental chamber humidity, temperature, drainage state, dehumidification device parameters and drying/dehumidification time may be further included; and visually displaying the environmental bin parameters through a display operation screen.
In the process of monitoring the working parameters, a humidity sensor and/or a temperature sensor is used for collecting humidity and temperature, and after detection, a controller reads data on the sensor in real time, the drainage state can include but is not limited to the water level of a drainage area, the opening or closing of a switch of the drainage area and the like, the parameters of a dehumidification device include but are not limited to wind speed, heating temperature and the like, the drying/dehumidification time is calculated by starting dehumidification by a power module to be dehumidified, and the dehumidification process of the same dehumidification power module is temporarily set when the dehumidification process is interrupted and continuously timed when the dehumidification process is continued. In order to further avoid the overdry condition, a humidity threshold can be set, and when the humidity in the environmental bin is monitored to exceed the humidity threshold, the dehumidification mode is automatically stopped.
Specifically, in the above dehumidification control method, the method may further include the step that a user sends an operation instruction through the display operation screen, and the controller adjusts the drying/dehumidification device in real time according to the operation instruction. The controller receives an operation instruction sent by a user through the display operation screen, adjusts the drying/dehumidifying device in real time, and the user can check the current state of the environment bin in real time through the display operation screen, also can adjust the drying/dehumidifying device in real time, and can adjust in time if unexpected situations occur.
According to the dehumidification control method, a controller is used for automatically controlling a drying/dehumidifying device in an environment bin to start or stop working, and static parameter tests of a power module to be dehumidified are carried out at preset intervals, wherein the static parameter tests comprise a blocking voltage test and a leakage current test, and when any test is abnormal, the working is automatically stopped, so that incomplete drying/excessive drying is avoided, and the electrical characteristics of the power module are further affected; real-time operating parameters including, but not limited to, ambient cabin humidity can also be monitored in real time to automatically stop when the threshold range is exceeded; besides, the working parameters can be recorded, when other power modules manufactured under the same working condition are dehumidified, the controller automatically controls the drying/dehumidifying device to continue working or stop working according to the working parameters, and batch dehumidification processing of the power modules is further realized under the condition of avoiding incomplete drying/excessive drying, so that the working efficiency is improved.
It should be noted that the embodiments of the present application are preferred and not limited in any way, and any person skilled in the art may make use of the above-disclosed technical content to change or modify the same into equivalent effective embodiments without departing from the technical scope of the present application, and any modification or equivalent change and modification of the above-described embodiments according to the technical substance of the present application still falls within the scope of the technical scope of the present application.
Claims (10)
1. A dehumidification system for a power module, comprising:
the environment bin is internally provided with a drying/dehumidifying device which is used for dehumidifying the power module to be dehumidified;
the controller is integrated with the environment bin and controls the drying/dehumidifying device to work;
the testing module is used for carrying out static parameter testing on the power module to be dehumidified at preset time intervals; the static parameter test comprises a blocking voltage test and a leakage current test, and a test result is fed back to the controller; the test module comprises:
the first test module is used for blocking voltage test, detecting real-time leakage current between a collector and an emitter of a chip in the power module to be dehumidified, gradually increasing voltage pulse stress to obtain a first voltage value when the real-time leakage current reaches a first preset value, and judging that a blocking voltage test result is abnormal when the first voltage value exceeds a first threshold range;
the second test module is used for testing leakage current, applying preset voltage pulse stress between a collector electrode and an emitter electrode of the chip in the power module to be dehumidified, detecting second leakage current under the preset voltage pulse stress, and judging that the leakage current test is abnormal when the second leakage current exceeds a second threshold range;
when the test module detects abnormal blocking voltage test and/or leakage current test, the controller controls the drying/dehumidifying device to continue to work, otherwise, the controller controls the drying/dehumidifying device to stop working;
the automatic control system comprises a recording module, a power module and a power module, wherein the recording module is used for automatically stopping the operation of a drying/dehumidifying device, recording working parameters and automatically controlling the dehumidification of the power module in batches, and the working parameters comprise the humidity of an environment bin, the temperature, the drainage state, the parameters of the dehumidifying device and the drying/dehumidifying time.
2. A dehumidification system as claimed in claim 1, wherein:
the bottom of the environment bin is provided with a drainage area, and the drying/dehumidifying device is arranged on one side opposite to the drainage area;
at least one humidity sensor and at least one temperature sensor are circumferentially arranged in the power module to be dehumidified in the environment bin so as to collect humidity and temperature of the environment bin.
3. A dehumidification system as claimed in claim 1, wherein:
the system also comprises an acquisition module for monitoring the real-time working parameters to synchronize to the controller.
4. A dehumidification system as claimed in claim 1, wherein:
when the dehumidification is carried out on another power module to be dehumidified, which is manufactured under the same working condition as the power module to be dehumidified, the controller obtains working parameters from the recording module and automatically controls the drying/dehumidifying device to continue working or stop working according to the working parameters.
5. A dehumidification system as claimed in claim 1, wherein:
the visual display device also comprises a display operation screen which is integrated on the outer side of the environmental bin and is used for visually displaying the working parameters.
6. The dehumidification system of claim 5, wherein:
the display operation screen receives an operation instruction sent by a user through the display operation screen and sends the operation instruction to the controller, so that the controller can adjust the drying/dehumidifying device in real time according to the operation instruction.
7. The dehumidification control method of the power module is characterized by comprising the following steps of:
placing the power module to be dehumidified in an environment bin, and controlling a drying/dehumidifying device in the environment bin to work by a controller;
carrying out static parameter test on the power module to be dehumidified at preset time intervals, wherein the static parameter test comprises a blocking voltage test and a leakage current test;
when a blocking voltage test is carried out, detecting real-time leakage current between a collector electrode and an emitter electrode of a chip in the power module to be dehumidified, gradually increasing voltage pulse stress to obtain a first voltage value when the real-time leakage current reaches a first preset value, and judging that a blocking voltage test result is abnormal when the first voltage value exceeds a first threshold range;
when a leakage current test is carried out, applying a preset voltage pulse stress between a collector electrode and an emitter electrode of a chip in the power module to be dehumidified, detecting real-time leakage current under the preset voltage pulse stress, and judging that the leakage current test is abnormal when the real-time leakage current exceeds a second threshold range;
when the blocking voltage test and/or the leakage current test are abnormal, the controller controls the drying/dehumidifying device to continue to work, otherwise, controls the drying/dehumidifying device to stop working;
recording working parameters, wherein the working parameters comprise environmental bin humidity, temperature, drainage state, dehumidifying device parameters and drying/dehumidifying time, and are used for the batch autonomous control dehumidification of the power module.
8. The dehumidification control method according to claim 7, characterized by further comprising:
obtaining another power module to be dehumidified, wherein the other power module to be dehumidified and the power module to be dehumidified are manufactured and obtained under the same working condition;
and the controller automatically controls the drying/dehumidifying device to continue working or stop working according to the working parameters.
9. The dehumidification control method according to claim 7, characterized by further comprising:
monitoring real-time working parameters, wherein the working parameters comprise environmental bin humidity, temperature, drainage state, dehumidifying device parameters and drying/dehumidifying time;
and visually displaying the working parameters through a display operation screen.
10. The dehumidification control method according to claim 9, characterized by comprising:
and the user sends out an operation instruction through the display operation screen, and the controller adjusts the drying/dehumidifying device in real time according to the operation instruction.
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