Temperature test device, temperature test equipment and temperature test method

Abstract

The invention relates to a temperature test device, temperature test equipment and a temperature test method. The temperature testing device comprises a liquid container, an inflow pipe and an outflow pipe, one end of the inflow pipe is connected with a first opening of the liquid container, the other end of the inflow pipe is connected with at least one first control valve, and the outflow pipe is connected with a second opening of the liquid container; the other end of the outflow pipe is connected with at least one second control valve; a to-be-tested power device is arranged on any surface of the liquid container; and the inflow pipe and the outflow pipe are used for circularly introducing and exporting the external liquid into and out of the liquid container and providing an environment temperature for a temperature test for the to-be-tested power device. The to-be-tested power device is in close contact with the surface of the liquid container, and the temperature of the to-be-tested power device is changed, so that the accuracy of a temperature impact test or a life aging test is improved, and meanwhile, the temperature changing efficiency is improved.

Description

Technical Field

[0001] The present application relates to the field of power electronics technology, and in particular to a temperature test device, a temperature test equipment and a temperature test method. Background Art

[0002] The temperature shock test is a method for offline reliability testing of power semiconductor devices, which is used to verify the ability of power devices to withstand high and low temperature extremes and their alternating shocks; the life aging test is another online reliability test method for power semiconductor devices, which is used to accelerate the degradation process by increasing the average temperature and temperature fluctuation amplitude of the device under test, and to study the full life characteristics of the device under test in a shorter time.

[0003] In the related art, when temperature tests such as temperature shock tests or life aging tests are performed on power semiconductors, the gas medium used has a small specific heat capacity and poor thermal conductivity. The temperature gradient of the heavy power devices to be tested is difficult to meet the test requirements and it is difficult to obtain accurate test results. The liquid medium has a large specific heat capacity and excellent thermal conductivity, which can achieve the temperature gradient required for the test of heavy power devices to be tested.

[0004] When traditional technology uses liquid mechanisms to conduct temperature tests on power semiconductors, the power device to be tested is completely immersed in the liquid medium, introducing additional factors that may cause the power device to be tested to fail, resulting in lower test accuracy. Summary of the invention

[0005] Based on this, it is necessary to provide a temperature test device, temperature test equipment and temperature test method that can improve the accuracy of temperature tests in order to solve the above technical problems.

[0006] In a first aspect, the present application provides a temperature test device, the temperature test device comprising: a liquid container, an inlet pipe and an outlet pipe;

[0007] Wherein, one end of the inlet pipe is connected to the first opening of the liquid container, and the other end of the inlet pipe is connected to at least one first control valve; the outlet pipe is connected to the second opening of the liquid container; the other end of the outlet pipe is connected to at least one second control valve; a power device to be tested is arranged on any surface of the liquid container;

[0008] The inlet pipe and the outlet pipe are used to circulate external liquid into and out of the liquid container to provide an ambient temperature for a temperature test of the power device to be tested.

[0009] In one embodiment, the first control valve is a first three-way valve, a first valve port of the first three-way valve is connected to the inlet pipe, a second valve port of the first three-way valve is connected to the first inlet branch pipe, and a third valve port of the first three-way valve is connected to the second inlet branch pipe.

[0010] In one embodiment, the second control valve is a second three-way valve, a first valve port of the second three-way valve is connected to the outlet pipe, a second valve port of the second three-way valve is connected to the first outlet branch pipe, and a third valve port of the second three-way valve is connected to the second outlet branch pipe.

[0011] In one embodiment, the temperature of the liquid introduced by the first inlet branch pipe is different from the temperature of the liquid introduced by the second inlet branch pipe.

[0012] In one embodiment, the first control valve is a first two-way valve, a first valve port of the first two-way valve is connected to the inlet pipe, and a second valve port of the first two-way valve is connected to the third inlet branch pipe.

[0013] In one embodiment, the second control valve is a second two-way valve, a first valve port of the second two-way valve is connected to the outlet pipe, and a second valve port of the second two-way valve is connected to the third outlet branch pipe.

[0014] In one embodiment, the temperatures of the liquids introduced by different third inlet branches are different.

[0015] In one embodiment, the first control valve is a first three-way mixing valve, the first valve port of the first three-way mixing valve is connected to the inlet pipe, the second valve port of the first three-way mixing valve is connected to the fourth inlet branch pipe, and the third valve port of the first three-way mixing valve is connected to the fifth inlet branch pipe.

[0016] In one embodiment, the second control valve is a second three-way mixing valve, a first valve port of the second three-way mixing valve is connected to the outlet pipe, a second valve port of the second three-way mixing valve is connected to the fourth outlet branch pipe, and a third valve port of the second three-way mixing valve is connected to the fifth outlet branch pipe.

[0017] In one embodiment, the temperature of the liquid introduced by the fourth inlet branch is different from the temperature of the liquid introduced by the fifth inlet branch, and the temperature of the liquid introduced into the inlet pipe is different from the temperature of the liquid introduced by the fourth inlet branch and the temperature of the liquid introduced by the fifth inlet branch.

[0018] In one embodiment, the opening degree of the first three-way mixing flow valve is the same as the opening degree of the second three-way mixing flow valve.

[0019] In a second aspect, the present application further provides a temperature test device, comprising: a controller and the temperature test device as described in the first aspect, and a power device to be tested.

[0020] In a third aspect, the present application further provides a temperature test method, which is applied to the temperature test device as described in the second aspect, and the method comprises:

[0021] Circulating liquid at a first temperature into the liquid container through the inlet pipe and the outlet pipe; when it is detected that the temperature of the power device to be tested reaches a second temperature, introducing liquid at a third temperature into the liquid container through the inlet pipe and the outlet pipe;

[0022] And / or, a liquid medium at a fourth temperature is circulated into the liquid container through the inlet pipe and the outlet pipe; after the duration of the introduction of the liquid medium at the fourth temperature reaches a preset duration, a liquid at a fifth temperature is introduced into the liquid container through the inlet pipe and the outlet pipe.

[0023] The temperature test device, temperature test equipment and temperature test method include: a liquid container, an inlet pipe and an outlet pipe, wherein one end of the inlet pipe is connected to the first opening of the liquid container, the other end of the inlet pipe is connected to at least one first control valve, and the outlet pipe is connected to the second opening of the liquid container; the other end of the outlet pipe is connected to at least one second control valve; a power device to be tested is arranged on any surface of the liquid container; the inlet pipe and the outlet pipe are used to circulate external liquid into and out of the liquid container to provide an ambient temperature for the temperature test for the power device to be tested. By closely contacting the power device to be tested with the surface of the liquid container, the temperature of the power device to be tested is changed, and the judgment of the test result is affected by direct contact between the power device to be tested and the liquid medium, thereby improving the accuracy of the temperature shock test or life aging test. At the same time, the first control valve and the second control valve can be used to quickly introduce liquid media of different temperatures into the liquid container, thereby improving the efficiency of changing the temperature and further improving the accuracy of the test in the scenario of rapid temperature change. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the drawings required for use in the embodiments of the present application or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 is a structural block diagram of a temperature test device in one embodiment;

[0026] Figure 2 is a structural block diagram of a temperature test device in another embodiment;

[0027] Figure 3 is a structural block diagram of a temperature test device in another embodiment;

[0028] Figure 4 is a structural block diagram of a temperature test device in another embodiment;

[0029] Description of reference numerals:

[0030] 01: Power device to be tested; 10: Liquid container; 20: Inlet pipe;

[0031] 30: outlet pipe; 40: first control valve; 50: second control valve;

[0032] 101: first opening; 102: second opening; 401: first three-way valve;

[0033] 501: second three-way valve; 402: first two-way valve; 502: second two-way valve;

[0034] 403: first three-way mixing valve; 503: second three-way mixing valve;

[0035] 201: first inflow branch pipe; 202: second inflow branch pipe; 203: third inflow branch pipe;

[0036] 204: fourth inflow branch pipe; 205: fifth inflow branch pipe; 301: first outflow branch pipe;

[0037] 302: second outflow branch pipe; 303: third outflow branch pipe; 304: fourth outflow branch pipe;

[0038] 305: fifth outflow branch;

[0039] 4011: the first valve port of the first three-way valve;

[0040] 4012: the second valve port of the first three-way valve;

[0041] 4013: the third valve port of the first three-way valve;

[0042] 5011: the first valve port of the second three-way valve;

[0043] 5012: the second valve port of the second three-way valve;

[0044] 5013: the third valve port of the second three-way valve;

[0045] 4021: the first valve port of the first two-way valve;

[0046] 4022: the second valve port of the first two-way valve;

[0047] 5021: the first valve port of the second two-way valve;

[0048] 5022: the second valve port of the second two-way valve;

[0049] 4031: the first valve port of the first three-way mixing valve;

[0050] 4032: the second valve port of the first three-way mixing valve;

[0051] 4033: the third valve port of the first three-way mixing valve;

[0052] 5031: the first valve port of the second three-way mixing valve;

[0053] 5032: the second valve port of the second three-way mixing valve;

[0054] 5033: The third valve port of the second three-way mixing valve. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0056] Unless otherwise defined, the technical terms or scientific terms involved in this application should be understood by people with ordinary skills in the technical field to which this application belongs. The words "one", "a", "a", "the" and the like involved in this application do not indicate a quantitative limitation and may represent the singular or plural. The terms "including", "comprising", "having" and any of their variations involved in this application are intended to cover non-exclusive inclusions; for example, a process, method, system, product or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may also include unlisted steps or units, or may also include other steps or units inherent to these processes, methods, products or devices. The "multiple" involved in this application means greater than or equal to two. "And / or" describes the association relationship of associated objects, indicating that there may be three relationships, for example, "A and / or B" can represent: A exists alone, A and B exist at the same time, and B exists alone. The terms "first", "second" and the like involved in this application are only used to distinguish similar objects and do not represent a specific ordering of objects.

[0057] It can be understood that the terms "first", "second", etc. used in the present application can be used in this article to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the first element from another element.

[0058] It can be understood that the "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if the connected circuits, units, elements, etc. have transmission of electrical signals or data with each other.

[0059] It can be understood that “at least one” means one or more, “plurality” means two or more, and “at least a portion of an element” means a part or all of an element.

[0060] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the relevant listed items.

[0061] The temperature shock test is an offline reliability test method for power semiconductor devices. It is used to verify the ability of the power semiconductor to be tested to withstand high and low temperature extremes and their alternating shocks. The existing test method mechanically moves the power semiconductor to be tested in two media with different temperatures, including gas medium and liquid medium. Among them, the gas medium has a wide temperature adjustment range and no waterproof requirements for the power device to be tested, but the gas medium has a small specific heat capacity and poor thermal conductivity, and the shock temperature gradient of the heavy power device to be tested is difficult to meet the test requirements; the liquid medium has a large specific heat capacity and excellent thermal conductivity, which can achieve the shock temperature gradient required by the test of the heavy power device to be tested, but the power device to be tested will be completely immersed in the liquid medium during the test, introducing additional factors that may cause the failure of the power device to be tested, affecting the judgment of the test results.

[0062] Life aging test is another online reliability test method for power semiconductor devices. It accelerates the degradation process by increasing the average temperature and temperature fluctuation amplitude of the power device to be tested, so as to study the full life characteristics of the power device to be tested in a shorter time. Among them, the average temperature of the power device to be tested is positively correlated with the temperature of the water-cooling medium in the radiator to which it is connected. The temperature of the water-cooling medium is controlled by the chiller through heat exchange with the environment. Due to the large volume of the water-cooling medium involved in the circulation and the slow overall heating and cooling speed, the temperature fluctuation amplitude of the power device to be tested can only be achieved by quickly changing the loss heat power of the device. The flexibility is insufficient, and the degradation acceleration capability has room for further improvement.

[0063] Therefore, there is an urgent need for a device that can quickly change the temperature of a power device to be tested.

[0064] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0065] In one embodiment, Figure 1 As shown, a temperature test device is provided, comprising: a liquid container, an inlet pipe and an outlet pipe; wherein one end of the inlet pipe is connected to the first opening of the liquid container, and the other end of the inlet pipe is connected to at least one first control valve; the outlet pipe is connected to the second opening of the liquid container; the other end of the outlet pipe is connected to at least one second control valve; a power device to be tested is arranged on any surface of the liquid container; the inlet pipe and the outlet pipe are used to circulate external liquid into and out of the liquid container to provide an ambient temperature for the temperature test of the power device to be tested.

[0066] Exemplarily, the liquid container is a hollow rectangular container with a buried liquid channel, and the liquid container can be a single-sided heat dissipation container or a double-sided heat dissipation container. When the liquid container is a single-sided heat dissipation container, the power device to be tested can be placed tightly on the heat dissipation surface of the liquid container, and the power device to be tested is in low thermal resistance contact with the heat dissipation surface; when the liquid container is a double-sided heat dissipation container, the power device to be tested can be placed between the heat dissipation surfaces of two groups of liquid containers, and the power device to be tested is in low thermal resistance close contact with the heat dissipation surface. Among them, the method of low thermal resistance contact may include: a contact surface with low flatness and low roughness, external pressure on the contact surface to maintain a large pressure, a contact surface coated with a thermal conductive medium, and a contact surface sandwiched with a soft thermal conductive film. For example, the thermal conductive medium can be silicone grease, silicone oil or liquid metal, and the thermal conductive film can be silver foil or aluminum foil.

[0067] In an embodiment of the present application, a first opening and a second opening are provided on the liquid container. The first opening can be used as an inlet for the liquid medium, and the second opening can be used as an outlet for the liquid medium. The first opening is connected to one end of an inlet pipe, and the other end of the inlet pipe is connected to a first control valve. The liquid medium passes through the first control valve and the inlet pipe in sequence and flows into the liquid container from the first inlet; the second opening is connected to one end of an outlet pipe, and the other end of the outlet pipe is connected to the second control valve. The liquid medium flows out of the liquid container from the second outlet, and then flows through the outlet pipe and the second control valve in sequence.

[0068] Optionally, when the inlet pipe is connected to multiple first control valves and the outlet pipe is connected to multiple second control valves, liquid media of different temperatures can be injected into the liquid container through different first control valves, and then the liquid medium can flow out from the second control valve corresponding to the first control valve; or, when there are one or more first control valves, liquid media of different temperatures can be injected into the liquid container through different valve ports of the first control valve, and then the liquid medium can flow out from the valve port of the second control valve corresponding to the valve port of the first control valve.

[0069] The temperature test device comprises: a liquid container, an inlet pipe and an outlet pipe, wherein one end of the inlet pipe is connected to the first opening of the liquid container, the other end of the inlet pipe is connected to at least one first control valve, and the outlet pipe is connected to the second opening of the liquid container; the other end of the outlet pipe is connected to at least one second control valve; a power device to be tested is arranged on any surface of the liquid container; the inlet pipe and the outlet pipe are used to circulate external liquid into and out of the liquid container to provide an ambient temperature for the temperature test for the power device to be tested. By closely contacting the power device to be tested with the surface of the liquid container, the temperature of the power device to be tested is changed, and the judgment of the test result is affected by direct contact between the power device to be tested and the liquid medium, thereby improving the accuracy of the temperature shock test or life aging test. At the same time, the first control valve and the second control valve can be used to quickly introduce liquid media of different temperatures into the liquid container, thereby improving the efficiency of changing the temperature and further improving the accuracy of the test in the scenario of rapid temperature change.

[0070] Based on the above embodiments, in one embodiment, Figure 2 As shown, the first control valve is a first three-way valve, a first valve port of the first three-way valve is connected to the inlet pipe, a second valve port of the first three-way valve is connected to the first inlet branch pipe, and a third valve port of the first three-way valve is connected to the second inlet branch pipe.

[0071] In the embodiment of the present application, the first control valve can be a first three-way valve, that is, the first three-way valve includes three valve ports, the first valve port of the first three-way valve is connected to the inlet pipe, the second valve port and the third valve port of the first three-way valve are the inlet of the liquid medium, the second valve port of the first three-way valve is connected to the first inlet branch pipe, the third valve port of the first three-way valve is connected to the second inlet branch pipe, the liquid medium flows into the liquid container from the first opening through the first valve port, and the second valve port and the third valve port of the first three-way valve are selectively connected. Exemplarily, the liquid medium can flow through the first inlet branch pipe, the second valve port of the first three-way valve, the first valve port of the first three-way valve, and the inlet pipe in sequence, and flow into the liquid container from the first opening; or the liquid medium can flow through the second inlet branch pipe, the third valve port of the first three-way valve, the first valve port of the first three-way valve, and the inlet pipe in sequence, and flow into the liquid container from the first opening.

[0072] Optionally, the temperature of the liquid introduced by the first inlet branch pipe is different from the temperature of the liquid introduced by the second inlet branch pipe. Rapid temperature conversion is achieved by the temperature of the liquid introduced by the first inlet branch pipe and the temperature of the liquid introduced by the second inlet branch pipe.

[0073] Optionally, in an embodiment of the present application, the second control valve is a second three-way valve, the first valve port of the second three-way valve is connected to the outlet pipe, the second valve port of the second three-way valve is connected to the first outlet branch pipe, and the third valve port of the second three-way valve is connected to the second outlet branch pipe. It should be noted that the valve port of the second control valve corresponds to the valve port of the first control valve one-to-one, that is, a liquid medium of a certain temperature flows in from the valve port of the first control valve and flows out from the valve port of the second control valve corresponding to the valve port of the first control valve. For example, the second valve port of the first control valve corresponds to the second valve port of the second control valve, and the third valve port of the first control valve corresponds to the third valve port of the second control valve.

[0074] Illustratively, the liquid medium can flow out of the liquid container from the second opening, and then flow through the outlet pipe, the first valve port of the second three-way valve, the second valve port of the second three-way valve, and the first outlet branch pipe in sequence; or, the liquid medium can flow out of the liquid container from the second opening, and then flow through the outlet pipe, the first valve port of the second three-way valve, the third valve port of the second three-way valve, and the second outlet branch pipe in sequence.

[0075] As an optional implementation, in order to make the power device to be tested quickly reach the target temperature required for the test, the liquid medium of the first temperature can be circulated into and out of the liquid container through the first inlet branch and the first outlet branch. When the temperature of the surface of the power device to be tested reaches the second temperature, the introduction of the liquid medium of the first temperature is stopped, and the liquid medium of the target temperature is circulated into and out of the liquid container through the second inlet branch and the second outlet branch, so that the temperature of the surface of the power device to be tested changes rapidly and stabilizes at the target temperature; wherein, during the temperature increase test, the first temperature is higher than the target temperature, and the target temperature is higher than or equal to the second temperature; during the temperature decrease test, the first temperature is lower than the target temperature, and the target temperature is lower than or equal to the second temperature. Exemplarily, during the temperature increase test, if the target temperature is 100 degrees Celsius, the first temperature can be 105 degrees Celsius, and the second temperature can be 95 degrees Celsius. The liquid medium at 105 degrees Celsius can be circulated into and out of the liquid container through the first inlet branch and the first outlet branch. When the temperature of the surface of the power device to be tested reaches 95 degrees Celsius, the introduction of the liquid medium at 105 degrees Celsius is stopped, and the liquid medium at 100 degrees Celsius is circulated into and out of the liquid container through the second inlet branch and the second outlet branch, so that the temperature of the surface of the power device to be tested changes rapidly and stabilizes at 100 degrees Celsius.

[0076] In this embodiment, a three-way valve is used as a control valve so that the temperature of the surface of the liquid container can be quickly switched between at least two temperatures, thereby improving the accuracy of the temperature shock test or the life aging test while improving the efficiency of changing the temperature.

[0077] Based on the above embodiments, in one embodiment, Figure 3 As shown, the first control valve is a first two-way valve, a first valve port of the first two-way valve is connected to the inlet pipe, and a second valve port of the first two-way valve is connected to the third inlet branch pipe.

[0078] In the embodiment of the present application, when the first control valve is a first two-way valve, the liquid medium sequentially passes through the third inlet branch, the second valve port of the first two-way valve, the first valve port of the first two-way valve, and the inlet pipe, and flows into the liquid container from the first opening. Optionally, the first control valve may include multiple first two-way valves, each of which is connected to a different third inlet branch, and the temperature of the liquid introduced into the third inlet branch is different.

[0079] Optionally, the second control valve is a second two-way valve, the first valve port of the second two-way valve is connected to the outlet pipe, and the second valve port of the second two-way valve is connected to the third outlet branch pipe. When the first control valve includes a plurality of first two-way valves and the second control valve includes a plurality of second two-way valves, each first two-way valve corresponds to each second two-way valve, and each group of two-way valves is respectively for liquid media of different temperatures.

[0080] As an optional implementation, in order to make the power device to be tested quickly reach the target temperature required for the test, the liquid medium of the first temperature can be first circulated into and out of the liquid container, and when the temperature of the surface of the power device to be tested reaches the second temperature, the introduction of the liquid medium of the first temperature is stopped, and the liquid medium of the target temperature is circulated into and out of the liquid container, so that the temperature of the surface of the power device to be tested changes rapidly and stabilizes at the target temperature; wherein, during the temperature increase test, the first temperature is higher than the target temperature, and the target temperature is higher than or equal to the second temperature; during the temperature decrease test, the first temperature is lower than the target temperature, and the target temperature is lower than or equal to the second temperature. Exemplarily, during the temperature increase test, if the target temperature is 100 degrees Celsius, the first temperature can be 105 degrees Celsius, and the second temperature can be 95 degrees Celsius, and the liquid medium of 105 degrees Celsius can be first circulated into and out of the liquid container, and when the temperature of the surface of the power device to be tested reaches 95 degrees Celsius, the introduction of the liquid medium of 105 degrees Celsius is stopped, and the liquid medium of 100 degrees Celsius is circulated into and out of the liquid container, so that the temperature of the surface of the power device to be tested changes rapidly and stabilizes at 100 degrees Celsius.

[0081] In this embodiment, a two-way valve is used as a control valve. The valve control method is more accurate and less prone to errors. In addition, when the control valve includes multiple two-way valves, it can quickly switch between multiple temperatures.

[0082] Based on the above embodiments, in one embodiment, Figure 4 As shown, the first control valve is a first three-way mixing valve, the first valve port of the first three-way mixing valve is connected to the inlet pipe, the second valve port of the first three-way mixing valve is connected to the fourth inlet branch pipe, and the third valve port of the first three-way mixing valve is connected to the fifth inlet branch pipe.

[0083] In the embodiment of the present application, the first control valve is a first three-way mixing valve, the first valve port of the first three-way mixing valve is connected to the inlet pipe, the second valve port and the third valve port of the first three-way mixing valve are used as the inlet of the liquid medium, the second valve port of the first three-way mixing valve is connected to the fourth inlet branch pipe, and the third valve port of the first three-way mixing valve is connected to the fifth inlet branch pipe. Exemplarily, the liquid introduced into the fourth inlet branch pipe and the liquid introduced into the fifth inlet branch pipe are mixed through the first three-way mixing valve and flow from the inlet pipe into the liquid container through the first inlet.

[0084] Optionally, the temperature of the liquid introduced into the fourth inlet branch is different from the temperature of the liquid introduced into the fifth inlet branch, and the temperature of the liquid introduced into the inlet pipe is different from the temperature of the liquid introduced into the fourth inlet branch and the temperature of the liquid introduced into the fifth inlet branch. The ratio of the first liquid medium flowing into the fourth inlet branch and the second liquid medium flowing into the fifth inlet branch is adjusted by controlling the first three-way mixing valve, thereby changing the temperature of the liquid introduced into the inlet pipe.

[0085] Optionally, the second control valve is a second three-way mixing valve, the first valve port of the second three-way mixing valve is connected to the outlet pipe, the second valve port of the second three-way mixing valve is connected to the fourth outlet branch pipe, and the third valve port of the second three-way mixing valve is connected to the fifth outlet branch pipe. The first valve port of the second three-way mixing valve is connected to the outlet pipe, and the second valve port and the third valve port of the second three-way mixing valve are used as the inlet of the liquid medium.

[0086] Optionally, the opening degree of the first three-way mixing flow valve is the same as the opening degree of the second three-way mixing flow valve.

[0087] In this embodiment, a three-way mixing flow valve is used as a control valve. By flexibly adjusting the opening of the three-way mixing flow valve and adjusting the proportion of liquid media of different temperatures flowing into the liquid container, a liquid medium of any temperature can be obtained, making the temperature control of the liquid medium more flexible and rapid.

[0088] In one embodiment, a temperature test device is provided, comprising the temperature test apparatus according to the above embodiment, a controller, and a power device to be tested.

[0089] This embodiment does not limit the type of temperature test equipment. In addition, the structure and working principle of the temperature test device included in the temperature test equipment provided in this embodiment, please refer to the detailed description of the temperature test device in the above embodiment, this embodiment will not be repeated here. The temperature test equipment in the embodiment of the present application can be used in any test that requires temperature change, such as temperature shock test, life aging test, etc., this embodiment will not be repeated here.

[0090] In one embodiment, a temperature test method is provided. The temperature test method is applied to the above-mentioned temperature test device, and the method includes:

[0091] Circulating liquid at a first temperature into the liquid container through an inlet pipe and an outlet pipe; when it is detected that the temperature of the power device to be tested reaches a second temperature, introducing liquid at a third temperature into the liquid container through the inlet pipe and the outlet pipe;

[0092] And / or, a liquid medium at a fourth temperature is circulated into the liquid container through the inlet pipe and the outlet pipe; after the duration of the introduction of the liquid medium at the fourth temperature reaches a preset duration, a liquid at a fifth temperature is introduced into the liquid container through the inlet pipe and the outlet pipe.

[0093] As an optional embodiment, the third temperature is the target temperature required for the temperature test. In order to make the power device to be tested quickly reach the third temperature required for the test, the liquid of the first temperature can be first circulated into the liquid container through the inlet pipe and the outlet pipe. When it is detected that the temperature of the power device to be tested reaches the second temperature, the introduction of the liquid medium of the first temperature is stopped, and the liquid of the third temperature is introduced into the liquid container through the inlet pipe and the outlet pipe, so that the temperature of the surface of the power device to be tested changes rapidly and stabilizes at the third temperature; wherein, during the temperature increase test, the first temperature is higher than the third temperature, and the third temperature is higher than or equal to the second temperature; during the temperature decrease test, the first temperature is lower than the third temperature, and the third temperature is lower than or equal to the second temperature. For example, taking the temperature rise test as an example, if the third temperature is 100 degrees Celsius, the first temperature can be 105 degrees Celsius, and the second temperature can be 95 degrees Celsius. The liquid medium at 105 degrees Celsius can be circulated into and out of the liquid container. When the temperature of the surface of the power device to be tested reaches 95 degrees Celsius, the introduction of the liquid medium at 105 degrees Celsius is stopped, and the liquid medium at 100 degrees Celsius is circulated into and out of the liquid container, so that the temperature of the surface of the power device to be tested changes rapidly and stabilizes at 100 degrees Celsius.

[0094] As another optional embodiment, the fourth temperature and the fifth temperature are both target temperatures required for the temperature test. The liquid medium at the fourth temperature can be first circulated into the liquid container through the inlet pipe and the outlet pipe. After the duration of the introduction of the liquid medium at the fourth temperature reaches a preset duration, the liquid at the fifth temperature is introduced into the liquid container through the inlet pipe and the outlet pipe. In the temperature increase test, the fifth temperature is higher than the fourth temperature; in the temperature decrease test, the fourth temperature is higher than the fifth temperature. Optionally, after the duration of the introduction of the liquid medium at the fifth temperature reaches a preset duration, the liquid medium at the fourth temperature can be introduced into the liquid container through the inlet pipe and the outlet pipe, and the process of circulated introduction of the liquid medium at the fourth temperature and the liquid medium at the fifth temperature can be repeated multiple times, thereby realizing the temperature cycle test. Exemplarily, the preset time length can be 10 seconds. Taking the temperature rise test as an example, the fourth temperature can be 10 degrees Celsius, and the fifth temperature can be 100 degrees Celsius. The liquid medium at 10 degrees Celsius can be circulated into the liquid container through the inlet pipe and the outlet pipe. After the time of introducing the liquid medium at 10 degrees Celsius reaches 10 seconds, the liquid at 100 degrees Celsius is introduced into the liquid container through the inlet pipe and the outlet pipe.

[0095] As another optional implementation, the fourth temperature and the fifth temperature can both be used as the third temperature mentioned above. Taking the temperature cycle test as an example, the fourth temperature can be 10 degrees Celsius, and the fifth temperature can be 100 degrees Celsius. First, 5 degrees Celsius is used as the first temperature and 15 degrees Celsius is used as the second temperature. The liquid medium at 5 degrees Celsius is circulated into and out of the liquid container. When the temperature of the surface of the power device to be tested reaches 15 degrees Celsius, the introduction of the liquid medium at 5 degrees Celsius is stopped, and the liquid medium at 10 degrees Celsius is circulated into and out of the liquid container, so that the temperature of the surface of the power device to be tested changes rapidly and stabilizes at 10 degrees Celsius; further, 105 degrees Celsius is used as the first temperature and 95 degrees Celsius is used as the second temperature. The liquid medium at 105 degrees Celsius is circulated into and out of the liquid container. When the temperature of the surface of the power device to be tested reaches 95 degrees Celsius, the introduction of the liquid medium at 105 degrees Celsius is stopped, and the liquid medium at 100 degrees Celsius is circulated into and out of the liquid container, so that the temperature of the surface of the power device to be tested changes rapidly and stabilizes at 100 degrees Celsius.

[0096] In the above temperature test method, a liquid of a first temperature is circulated into a liquid container through an inlet pipe and an outlet pipe; when it is detected that the temperature of the power device to be tested reaches a second temperature, a liquid of a third temperature is introduced into the liquid container through the inlet pipe and the outlet pipe; or, a liquid medium of a fourth temperature is circulated into the liquid container through the inlet pipe and the outlet pipe; after the duration of introducing the liquid medium of the fourth temperature reaches a preset duration, a liquid of a fifth temperature is introduced into the liquid container through the inlet pipe and the outlet pipe. By quickly introducing liquid media of different temperatures into the liquid container through the inlet pipe and the outlet pipe, the efficiency of changing the temperature is improved. At the same time, by introducing the liquid medium of the first temperature and taking the second temperature as a reference, the temperature of the power device to be tested can reach the third temperature more quickly.

[0097] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0098] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A temperature test device, characterized in that: The temperature test device comprises: a liquid container, an inlet pipe and an outlet pipe; Wherein, one end of the inlet pipe is connected to the first opening of the liquid container, and the other end of the inlet pipe is connected to at least one first control valve; the outlet pipe is connected to the second opening of the liquid container; the other end of the outlet pipe is connected to at least one second control valve; a power device to be tested is arranged on any surface of the liquid container; The inlet pipe and the outlet pipe are used to circulate external liquid into and out of the liquid container to provide an ambient temperature for a temperature test of the power device to be tested.

2. The temperature test device according to claim 1, characterized in that: The first control valve is a first three-way valve, a first valve port of the first three-way valve is connected to the inlet pipe, a second valve port of the first three-way valve is connected to the first inlet branch pipe, and a third valve port of the first three-way valve is connected to the second inlet branch pipe.

3. The temperature test device according to claim 1, characterized in that: The second control valve is a second three-way valve, a first valve port of the second three-way valve is connected to the outlet pipe, a second valve port of the second three-way valve is connected to the first outlet branch pipe, and a third valve port of the second three-way valve is connected to the second outlet branch pipe.

4. The temperature test device according to claim 2, characterized in that: The temperature of the liquid introduced into the first inlet branch pipe is different from the temperature of the liquid introduced into the second inlet branch pipe.

5. The temperature test device according to claim 1, characterized in that: The first control valve is a first two-way valve, a first valve port of the first two-way valve is connected to the inlet pipe, and a second valve port of the first two-way valve is connected to the third inlet branch pipe.

6. The temperature test device according to claim 1, characterized in that: The second control valve is a second two-way valve, a first valve port of the second two-way valve is connected to the outlet pipe, and a second valve port of the second two-way valve is connected to the third outlet branch pipe.

7. The temperature test device according to claim 5, characterized in that: The temperatures of the liquid introduced by different third inlet branches are different.

8. The temperature test device according to claim 1, characterized in that: The first control valve is a first three-way mixing valve, the first valve port of the first three-way mixing valve is connected to the inlet pipe, the second valve port of the first three-way mixing valve is connected to the fourth inlet branch pipe, and the third valve port of the first three-way mixing valve is connected to the fifth inlet branch pipe.

9. The temperature test device according to claim 1, characterized in that: The second control valve is a second three-way mixing valve, a first valve port of the second three-way mixing valve is connected to the outlet pipe, a second valve port of the second three-way mixing valve is connected to the fourth outlet branch pipe, and a third valve port of the second three-way mixing valve is connected to the fifth outlet branch pipe.

10. The temperature test device according to claim 8, characterized in that: The temperature of the liquid introduced into the fourth inlet branch is different from the temperature of the liquid introduced into the fifth inlet branch, and the temperature of the liquid introduced into the inlet pipe is different from the temperature of the liquid introduced into the fourth inlet branch and the temperature of the liquid introduced into the fifth inlet branch.

11. The temperature test device according to claim 8, characterized in that: The opening degree of the first three-way mixing flow valve is the same as the opening degree of the second three-way mixing flow valve.

12. A temperature test device, characterized in that: The temperature test equipment comprises a controller and a temperature test device as described in any one of claims 1 to 11, and a power device to be tested.

13. A temperature test method, characterized in that: The temperature test method is applied to the temperature test equipment as claimed in claim 12, and the method comprises: Circulating liquid at a first temperature into the liquid container through the inlet pipe and the outlet pipe; when it is detected that the temperature of the power device to be tested reaches a second temperature, introducing liquid at a third temperature into the liquid container through the inlet pipe and the outlet pipe; And / or, a liquid medium at a fourth temperature is circulated into the liquid container through the inlet pipe and the outlet pipe; after the duration of the introduction of the liquid medium at the fourth temperature reaches a preset duration, a liquid at a fifth temperature is introduced into the liquid container through the inlet pipe and the outlet pipe.

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