Thermoelectric device power-on test reliability evaluation device and method

Abstract

The invention provides a thermoelectric device power-on test reliability evaluation device and method. The device comprises an environment control box, a heat dissipation tray, a power supply control module and a current monitoring and acquisition module. A plurality of pairs of tray frames are arranged on the side wall in the environment control box, the heat dissipation tray is installed on the tray frames through sliding rails on the left side and the right side, a plurality of installation grooves are formed in the upper surface of the heat dissipation tray, a radiator is arranged on the lower surface of the heat dissipation tray, and thermoelectric devices are placed in the installation grooves. The power supply control module is connected with the plurality of thermoelectric devices; the current monitoring acquisition module is connected with a plurality of thermoelectric devices; by simulating the working environment of the thermoelectric device, controlling the heat dissipation condition of the hot end of the thermoelectric device, and controlling and monitoring the input voltage and current, the switching time and the cycle index of the thermoelectric device, the reliability evaluation functions of long-term power-on test, power cycle switching test and the like of the thermoelectric device are realized.

Description

Technical Field

[0001] This invention relates to the field of thermoelectric device technology, and more particularly to a device and method for evaluating the reliability of thermoelectric devices during power-on testing. Background Technology

[0002] Thermoelectric devices are semiconductor electronic components that can convert electrical energy into heat energy. They have advantages such as being all-solid-state, having no moving parts, being small in size, and having a long lifespan. Currently, they are widely used in fields such as temperature control of optical communication modules and heat dissipation of military weapons and equipment.

[0003] For thermoelectric devices that have been in service for a long time, it is necessary to conduct long-term power-on tests and intermittent switching cycle power-on tests under various harsh environmental conditions to evaluate the reliability of the thermoelectric devices. However, there is no such testing and evaluation scheme in the current technology. Summary of the Invention

[0004] The purpose of this invention is to provide a device and method for evaluating the reliability of thermoelectric devices during power-on testing. By simulating the working environment of thermoelectric devices, controlling the heat dissipation conditions of the hot end of thermoelectric devices, and controlling and monitoring the input voltage and current, switching time and number of cycles of thermoelectric devices, the device can achieve reliability evaluation functions such as long-term power-on testing and power cycle switching testing of thermoelectric devices. This device for evaluating the reliability of thermoelectric devices during power-on testing is highly efficient, simple to operate, reliable in operation, and convenient for evaluation.

[0005] The technical means employed in this invention are as follows:

[0006] A reliability evaluation device for energized testing of thermoelectric devices, comprising: an environmental control box, a heat dissipation tray, a power control module, and a current monitoring and acquisition module;

[0007] The environmental control box has several pairs of tray frames inside its cavity. The heat dissipation tray is mounted on the tray frame via slide rails on the left and right sides. The upper surface of the heat dissipation tray has several mounting slots, and the lower surface of the heat dissipation tray has a radiator. The thermoelectric device is placed in the mounting slot.

[0008] The environmental control box is equipped with a power control module and a current monitoring and acquisition module on its exterior.

[0009] The power control module is connected to several thermoelectric devices; the power control module supplies power to the thermoelectric devices and controls the input voltage, input current, switching time, and cycle number of the thermoelectric devices.

[0010] The current monitoring and acquisition module is connected to several thermoelectric devices; the current monitoring and acquisition module monitors and records the input current of the thermoelectric devices in real time.

[0011] Further, a cable hole is arranged on the side wall of the environment control box for the wire to pass through, and the power control module and the current monitoring and collecting module are connected with the thermoelectric device through the wire.

[0012] Further, the heat sink is one of a uniform heating plate, a heat pipe and a profile heat sink.

[0013] Further, the thermoelectric device is installed on the heat dissipation tray through the heat conductive interface material.

[0014] Further, the heat conductive interface material comprises silicone grease, silicone rubber pad and graphite paste.

[0015] Further, the plurality of thermoelectric devices are connected in parallel and connected with the power control module, and the plurality of thermoelectric devices are connected in series with the current monitoring and collecting module.

[0016] Further, the power control module comprises a constant current and constant voltage direct current power supply, a cycle time and number controller and a relay.

[0017] Further, the heat dissipation trays are arranged at equal intervals.

[0018] The application also provides a thermoelectric device power-on test reliability evaluation method, which is realized based on the above-mentioned any one thermoelectric device power-on test reliability evaluation device and comprises the following steps.

[0019] The heat dissipation tray is pulled out, the thermoelectric device is installed in the installation groove of the heat dissipation tray through the heat conductive interface material, and the plurality of thermoelectric devices of the same type are connected in parallel on the terminal.

[0020] The heat dissipation tray is pushed into the environment control box through the slide rail and the support frame, and the plurality of groups of thermoelectric devices connected in parallel are extended to the outside of the box through the cable hole and connected with the power control module and the current monitoring and collecting module.

[0021] The door of the environment control box is closed, the cable hole is sealed, the environmental conditions in the environment control box are set, the power-on test is performed after the stable set conditions in the environment control box are reached, and the power control module is turned on.

[0022] The input voltage, input current, switching time and cycle number of each group of thermoelectric devices are set in the power control module, and the current monitoring and collecting module is turned on to observe and record the input current of the thermoelectric device.

[0023] The threshold value is set according to the test standard.

[0024] When the input current is located in the set threshold value, the thermoelectric device power-on test reliability is qualified.

[0025] When the input current is not located in the set threshold value, the thermoelectric device power-on test reliability is unqualified.

[0026] Further, the hot end temperature of the thermoelectric device and the ambient temperature are maintained at the same condition during the power-on test.

[0027] Compared with the prior art, the present application has the following advantages:

[0028] The power-on test reliability evaluation system of the thermoelectric device integrates the environmental control box, the thermoelectric device heat dissipation tray, the power supply control module and the current data acquisition module into a unified test system, realizes the simulation of the working environment of the thermoelectric device, controls the heat dissipation condition of the hot end of the thermoelectric device through the setting of the heat sink, controls and monitors the input voltage and current, the switching time and the cycle number of the thermoelectric device, and completes the long-term power-on test and the power cycle switching test of the thermoelectric device and other reliability evaluations.

[0029] The heat dissipation tray combines the heat dissipation structure with the tray, facilitates the installation of multiple thermoelectric devices of various models and can dissipate heat from the hot end of the thermoelectric device, maintains the hot end temperature of the thermoelectric device and the ambient temperature at the same condition during the power-on test, and sets the slide rails on both sides of the tray to conveniently and stably place the heat dissipation tray in the environmental control box.

[0030] The power supply control module can continuously adjust the current and voltage, set the switching time and cycle number, and meet the power-on conditions of the actual use of the thermoelectric device.

[0031] The current data acquisition module can simultaneously monitor and record the input current change of each thermoelectric device, and the test personnel can evaluate the reliability of the thermoelectric device during the test process or process the test data after the test is completed. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0033] Figure 1 is a component composition diagram of the device of the present application;

[0034] Figure 2 is a structure diagram of the environmental control box of the present application;

[0035] Figure 3 is a structure diagram of the heat dissipation tray of the present application;

[0036] Figure 4 is a connection diagram of the test circuit of the present application;

[0037] Figure 5 is a test evaluation data chart of the embodiment of the present application;

[0038] In the figure: 1, environmental control box; 2, heat dissipation tray; 3, power control module; 4, current monitoring acquisition module; 5, thermoelectric device; 101, cavity; 102, tray frame; 103, cable hole; 201, mounting groove; 202, slide rail; 203, heat sink. DETAILED DESCRIPTION

[0039] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0040] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0041] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a presence of the features, steps, operations, devices, components and / or their combinations.

[0042] Unless specifically stated otherwise, the relative arrangement of the components and steps, numerical expressions, and numerical values set forth in the embodiments are not meant to limit the scope of the present application. At the same time, it should be clear that the sizes of the various parts shown in the drawings are not drawn in accordance with the actual proportional relationship. The technology, methods and devices known to those skilled in the relevant art can not be discussed in detail, but under appropriate circumstances, the technology, methods and devices should be considered as part of the authorized specification. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary, and not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0043] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and in the absence of contrary description, these orientation words do not indicate and imply that the devices or elements referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the scope of protection of the present application: the orientation words "inner, outer" refer to the inner and outer relative to the contour of each component itself.

[0044] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper" and the like can be used herein to describe the spatial positional relationship of one device or feature with respect to other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the devices described in the drawings. For example, if the devices in the drawings are inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0045] As Figures 1-4 shown, the present application provides a thermoelectric device power-on test reliability evaluation device, comprising: an environment control box 1, a heat dissipation tray 2, a power supply control module 3 and a current monitoring and collecting module 4;

[0046] The environment control box 1 can realize stable simulation environment of temperature and humidity in the internal closed cavity, a plurality of tray racks 102 are arranged in the cavity 101 of the environment control box 1, the heat dissipation tray 2 is installed on the tray rack 102 through the left and right side sliding rails 202, and the heat dissipation trays 2 are arranged at equal intervals. A plurality of mounting grooves 201 are arranged on the upper surface of the heat dissipation tray 2, a heat sink 203 is arranged on the lower surface of the heat dissipation tray 2, and a thermoelectric device 5 is placed in the mounting groove 201; the environment control box 1 has heating function, refrigeration function, humidification function, vacuumization function and visual window.

[0047] The environment control box 1 is provided with a power supply control module 3 and a current monitoring and collecting module 4 outside;

[0048] The power control module 3 is connected with a plurality of thermoelectric devices 5; the power control module 3 supplies power for the thermoelectric devices 5, and controls the input voltage, input current, switching time and cycle number of the thermoelectric devices 5; the plurality of thermoelectric devices 5 are connected in parallel and then connected with the power control module 3; the power control module 3 comprises a constant-current constant-voltage DC power supply, a cycle time and number controller and a relay.

[0049] The current monitoring and collecting module 4 is connected with the plurality of thermoelectric devices 5; the current monitoring and collecting module 4 monitors and records the input current of the thermoelectric devices 5 in real time; the side wall of the environmental control box 1 is provided with a cable hole 103 for passing through a wire; the power control module 3 and the current monitoring and collecting module 4 are connected with the thermoelectric devices 5 through the wire; and the plurality of thermoelectric devices 5 are connected in series with the current monitoring and collecting module 4.

[0050] The heat sink 203 is one of a uniform heating plate, a heat pipe and a profile heat sink.

[0051] The thermoelectric device 5 is installed on the heat dissipation tray 2 through a heat-conducting interface material; and the heat-conducting interface material comprises silicone grease, a silica gel pad and graphite paste.

[0052] The application further provides a thermoelectric device power-on test reliability evaluation method, which is realized based on the thermoelectric device power-on test reliability evaluation device and comprises the following steps.

[0053] The heat dissipation tray 2 is pulled out, the thermoelectric device 5 is installed in the installation groove 201 of the heat dissipation tray 2 through a heat-conducting interface material, and a plurality of thermoelectric devices 5 of the same type are connected in parallel on a terminal.

[0054] The heat dissipation tray 2 is pushed into the environmental control box 1 through the slide rail 202 and the support frame, and the plurality of groups of thermoelectric devices 5 are extended to the outside of the box through the cable hole 103 and connected with the power control module 3 and the current monitoring and collecting module 4.

[0055] The door of the environmental control box 1 is closed, the cable hole 103 is sealed, the environmental conditions in the environmental control box 1 are set, the power control module 3 is turned on to perform the power-on test after the environmental control box 1 reaches the stable set conditions, and the heat end temperature of the thermoelectric device 5 and the environmental temperature are maintained in the same condition during the power-on test.

[0056] The input voltage, input current, switching time and cycle number of each group of thermoelectric devices 5 are set in the power control module 3, and the input current of the thermoelectric device 5 is observed and recorded by turning on the current monitoring and collecting module 4.

[0057] The threshold value is set according to the test standard;

[0058] When the input current is within the set threshold value, the thermoelectric device power-on test reliability is qualified.

[0059] When the input current is not within the set threshold, the power-on test reliability of the thermoelectric device is unqualified.

[0060] Embodiment

[0061] The application provides a thermoelectric device power-on test reliability evaluation device, which is composed of an environment control box 1, a heat dissipation tray 2, a power supply control module 3, a current monitoring and collecting module 4 and a measured thermoelectric device 5.

[0062] In the embodiment, the functional area of the environment control box is a cavity 101, three groups of tray racks 102 and three groups of cable holes 103, the temperature control range is-60℃ to 150℃, the humidity control range is 10% to 85%, and the environment control box also has the ability of vacuumizing;

[0063] In the embodiment, the heat dissipation tray 2 is made of aluminum alloy, the upper surface is processed with 10 installation grooves 201 according to the size of the measured thermoelectric device, the installation grooves are smooth and flat, the upper base plate of the heat dissipation tray 2 is a heat plate with capillary microchannels and cooling liquid inside, the bottom of the heat dissipation tray 2 is processed into a tooth-shaped radiator 203, and the left and right ends of the heat dissipation tray 2 are processed into smooth semicylindrical guide rails 202.

[0064] In the embodiment, the power supply control module 3 is composed of a constant-voltage constant-current direct-current power supply, a time and cycle number controller and a relay, and the thermoelectric device 5 connected in parallel is powered through wires.

[0065] In the embodiment, the current monitoring and collecting module 4 has a 10-channel function and is connected in series with the thermoelectric device 5, can display the current curve in real time through a display screen, and can record and store the current data through a U disk and other storage devices.

[0066] In this embodiment, the reliability evaluation test of the intermittent power cycle of 10 thermoelectric devices TEC-19904 prepared by bismuth telluride material is carried out by using the invented thermoelectric device power-on test reliability evaluation device, and the test standard is based on "GR-468-CORE 7.1.12"; after evenly smearing the heat-conducting silicone grease on the hot end of the 10 thermoelectric devices, the thermoelectric devices are installed in the installation slots of the heat dissipation tray, the anode lead wire of each thermoelectric device is connected in series into a channel of the current monitoring and collecting module, then the 10 thermoelectric devices are connected in parallel by using 2-in-20-out parallel connection terminals, the heat dissipation tray installed with the thermoelectric devices is pushed into the environmental control box through the slide rail and stably installed on the tray rack; the channel line of the current monitoring and collecting module and the positive and negative lead wires after parallel connection are connected with the current monitoring and collecting module and the power control module outside the environmental control box through the cable holes, the door of the environmental control box is closed and the cable holes are sealed by using silica gel plugs; the power of the environmental control box is turned on, the temperature is set to 85℃ and the humidity is set to 85% RH; after waiting for the environmental conditions in the box to reach the set values, the power control module is turned on, the voltage value is set to 12V, the current value is set to 50A, the power-on time is set to 1.5min, the power-off time is set to 4.5min, and the cycle number is set to 100 times; the current value of each channel is observed by turning on the current monitoring and collecting module.

[0067] As shown in Figure 5 A set of data values recorded by the thermoelectric device power-on test reliability evaluation device in this embodiment, the data shows that the current value of the thermoelectric device changes from 4A to 4.03A after 100 on-off power cycle, the change is less than 1%, and the reliability evaluation is qualified.

[0068] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A thermoelectric device power-on test reliability evaluation apparatus, characterized by comprising: a thermoelectric device power-on test reliability evaluation device; and a thermoelectric device power-on test reliability evaluation program. The application relates to an environment control box (1), a heat dissipation tray (2), a power supply control module (3) and a current monitoring and collecting module (4). A plurality of pairs of tray racks (102) are arranged in the cavity (101) of the environment control box (1), the heat dissipation tray (2) is arranged on the tray racks (102) through left and right slide rails (202), a plurality of mounting grooves (201) are arranged on the upper surface of the heat dissipation tray (2), a heat radiator (203) is arranged on the lower surface of the heat dissipation tray (2), and a thermoelectric device (5) is arranged in the mounting groove (201). The environment control box (1) is externally provided with the power supply control module (3) and the current monitoring and collecting module (4). The power supply control module (3) is connected with the plurality of thermoelectric devices (5); the power supply control module (3) supplies power for the thermoelectric devices (5), and the power supply control module (3) controls the input voltage, the input current, the switching time and the cycle number of the thermoelectric devices (5). The current monitoring and collecting module (4) is connected with the plurality of thermoelectric devices (5); the current monitoring and collecting module (4) monitors and records the input current of the thermoelectric devices (5) in real time. Cable holes (103) for leading wires to pass through are arranged on the side wall of the environment control box (1), and the power supply control module (3) and the current monitoring and collecting module (4) are connected with the thermoelectric devices (5) through the leading wires.

2. The thermoelectric device power-on testing reliability evaluation apparatus according to claim 1, characterized by, The heat radiator (203) is one of a uniform heating plate, a heat pipe and a profile heat radiator.

3. The thermoelectric device power-on testing reliability evaluation apparatus according to claim 1, characterized by, The thermoelectric device (5) is arranged on the heat dissipation tray (2) through a heat-conducting interface material.

4. The thermoelectric device power-on testing reliability evaluation apparatus according to claim 1, characterized by, The heat-conducting interface material comprises silicon grease, a silica gel pad and a graphite sticker.

5. The thermoelectric device power-on testing reliability evaluation apparatus according to claim 4, characterized by, The plurality of thermoelectric devices (5) are connected in parallel and then connected with the power supply control module (3), and the plurality of thermoelectric devices (5) are connected in series with the current monitoring and collecting module (4) respectively.

6. The thermoelectric device power-on testing reliability evaluation apparatus according to claim 1, wherein The power supply control module (3) comprises a constant-current constant-voltage direct-current power supply, a cycle time and number controller and a relay.

7. The thermoelectric device power-on testing reliability evaluation apparatus according to claim 1, wherein The heat dissipation trays (2) are arranged at equal intervals.

8. The thermoelectric device power-on testing reliability evaluation apparatus according to claim 1, characterized by, The application further discloses a test method of the environment control box (1).

9. A method for evaluating reliability of power-on testing of a thermoelectric device, implemented based on the apparatus for evaluating reliability of power-on testing of a thermoelectric device according to any one of claims 1 to 8, characterized by, The heat dissipation tray (2) is pulled out, the thermoelectric devices (5) are arranged in the mounting grooves (201) of the heat dissipation tray (2) through the heat-conducting interface material, and multiple thermoelectric devices (5) of the same type are connected in parallel on a wiring terminal. The heat dissipation tray (2) is pushed into the environment control box (1) through the slide rails (202) and the supporting frames, a plurality of groups of the thermoelectric devices (5) connected in parallel are extended to the outside of the box through the cable holes (103) and connected with the power supply control module (3) and the current monitoring and collecting module (4). The box door of the environment control box (1) is closed, the cable holes (103) are sealed, the environmental conditions in the environment control box (1) are set, the power supply control module (3) is turned on to perform power-on test after the environment control box (1) reaches the stable set conditions. The input voltage, the input current, the switching time and the cycle number of each group of the thermoelectric devices (5) are set in the power supply control module (3), and the current monitoring and collecting module (4) is turned on to observe and record the input current of the thermoelectric devices (5). Threshold values are set according to test standards. When the input current is located in the set threshold value, the power-on test reliability of the thermoelectric device is qualified. ​ When the input current is not within the set threshold, the thermoelectric device power-on test is not reliable.

10. The method of claim 9, wherein the method is characterized by: The thermoelectric device (5) is maintained at the same condition of the ambient temperature at the hot end during the power-on test.

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