Power cycle test device for power module and use method

Abstract

The invention provides a power cycle test device for a power module and a use method, the test device comprises a controller, two tool clamps connected in parallel and a cooling assembly, the tool clamps clamp N to-be-tested power devices connected in series, and the to-be-tested power devices are connected with power cycle test equipment; the controller controls the flow of the cooling assembly under the condition that the power cycle test equipment loads load current to the to-be-tested power device, so that the speed of water flowing through the tool clamp is smaller than a first preset threshold value; and under the condition that the power cycle test equipment performs load current turn-off on the to-be-tested power device, the flow of the cooling assembly is controlled, so that the speed of water flowing through the tool clamp is greater than a second preset threshold value, and the power cycle test equipment collects parameters of the to-be-tested power device. According to the invention, the loss of connection power consumption of the to-be-tested power device is greatly improved, so that the shell temperature of the to-be-tested power device rapidly meets the experiment requirement, and the experiment time is shortened.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic device testing, and in particular to a power cycle testing device for a power module and a use method thereof. Background Art

[0002] Power semiconductor modules are key components in power electronics systems, mainly used for power conversion and circuit power control. Common power semiconductor devices include: IGBT (Insulate-Gate Bipolar Transistor) devices and silicon carbide MOSFET devices. The structure of a power semiconductor module is composed of a variety of different material layers, including a Pinfin heat sink, solder, ceramic copper-clad substrate, chip, and bonding wire. Different materials have different expansion coefficients when the temperature changes. Frequent fluctuations will cause stress changes at the material interface, leading to material performance degradation, thereby reducing the life of the power semiconductor module.

[0003] Power cycling is the core means to verify the reliability of packaged devices. Under certain cooling conditions, the corresponding load current is applied to the device under test to make the device reach the specified temperature. The virtual junction temperature of the device is obtained through the test current to reflect the stress of the module under real working conditions.

[0004] During the power cycle test, it is necessary to adopt reasonable clamping, cooling, insulation, electrical connection methods, and reasonable use of the existing power cycle host to achieve an efficient and accurate test mode. However, the existing power cycle test equipment can only test a small number of devices each time, the experiment time is long, and the efficiency is low. Summary of the invention

[0005] The present invention provides a power cycle test device for a power module and a use method thereof, the main purpose of which is to shorten the power cycle test time and improve the power cycle test efficiency.

[0006] In a first aspect, an embodiment of the present invention provides a power cycle test device for a power module, comprising a controller, two parallel fixtures and a cooling assembly, wherein a first end of the controller is connected to a first end of the cooling assembly, a second end of the controller is connected to a second end of the cooling assembly, a third end of the controller is connected to one end of the fixture, a fourth end of the controller is connected to the other end of the fixture, a third end of the cooling assembly is used to be connected to an input end of a chiller, and a fourth end of the cooling assembly is used to be connected to an output end of the chiller, wherein:

[0007] The fixture is used to clamp N power devices to be tested connected in series, and the power devices to be tested are connected to a power cycle test device, where N is a positive integer;

[0008] The controller is used to control the flow rate of the cooling assembly when the power cycle test device applies a load current to the power device to be tested, so that the water flow rate flowing through the fixture is less than a first preset threshold value, so that the power cycle test device collects the parameters of the power device to be tested;

[0009] Used to control the flow of the cooling component when the power cycle test equipment shuts off the load current of the power device to be tested, so that the water flow rate flowing through the tooling fixture is greater than a second preset threshold value, so that the power cycle test equipment can collect parameters of the power device to be tested.

[0010] Further, the cooling assembly includes a first solenoid valve, a second solenoid valve, a third solenoid valve and a fourth solenoid valve, wherein:

[0011] One end of the first solenoid valve is connected to the input end of the chiller, and the other end of the first solenoid valve is connected to the first end of the controller;

[0012] One end of the second solenoid valve is connected to the input end of the chiller, and the other end of the second solenoid valve is connected to the first end of the controller through the third solenoid valve;

[0013] One end of the fourth solenoid valve is connected to the input end of the chiller, and the other end of the fourth solenoid valve is connected to the output end of the chiller.

[0014] Furthermore, the controller is used to control the first solenoid valve and the third solenoid valve to close, and control the fourth solenoid valve to open, when the power cycle test equipment applies a load current to the power device to be tested.

[0015] Furthermore, the controller is used to control the third solenoid valve and the fourth solenoid valve to close, and control the first solenoid valve to open, when the power cycle test equipment applies a load current to the power device to be tested.

[0016] Furthermore, the controller is used to control the third solenoid valve and the second solenoid valve to open, and control the first solenoid valve and the fourth solenoid valve to close when the power cycle test equipment shuts off the load current of the power device to be tested.

[0017] Furthermore, the cooling component also includes a flow meter, one end of the flow meter is connected to the other end of the fourth solenoid valve, and the other end of the flow meter is connected to the second end of the controller.

[0018] Furthermore, the fixture includes a rectangular body with a hollow structure, a water inlet pipe and a clamp, the water inlet pipe is located inside the rectangular body, the clamp is located on the rectangular body and above the water inlet pipe, and the clamp is used to fix the power device to be tested.

[0019] Furthermore, the controller is also used to send a first instruction to enable the power cycle test equipment to perform a thermal resistance test on the power device to be tested.

[0020] Furthermore, the controller is further configured to send a second instruction so that the power cycle test device measures the K factor of the power device to be tested.

[0021] In a second aspect, an embodiment of the present invention provides a method for using a power cycle test device for a power module based on the first aspect, including:

[0022] Clamp N power devices to be tested in series by the fixture, wherein the power devices to be tested are connected to a power cycle test device, and N is a positive integer;

[0023] By means of the controller, when the power cycle test device applies a load current to the power device to be tested, the flow rate of the cooling assembly is controlled so that the water flow rate flowing through the fixture is less than a first preset threshold value, so that the power cycle test device collects the parameters of the power device to be tested;

[0024] When the power cycle test equipment shuts off the load current of the power device under test, the flow of the cooling assembly is controlled so that the water flow rate flowing through the fixture is greater than a second preset threshold value, so that the power cycle test equipment can collect parameters of the power device under test.

[0025] The present invention proposes a power cycle test device for a power module and a method for using the same. When the power cycle test device is used to test a power device to be tested, all the power devices to be tested are connected in series and then fixed on a fixture. The power cycle test device includes two parallel fixtures, so that a large number of power devices to be tested can be placed in the two parallel fixtures. Multiple power devices to be tested can be measured through one power cycle, thereby improving the efficiency of the power cycle test.

[0026] In addition, when the load current is loaded, the controller controls the flow of the cooling component so that the water flow in the fixture is very small or there is no water flow, thereby allowing the power device under test to heat up quickly. When the load current is turned off, the controller controls the flow of the cooling component so that the water flow in the fixture is large, thereby achieving rapid cooling.

[0027] The embodiment of the present invention greatly improves the loss of connection power consumption of the power device to be tested, so that the shell temperature of the power device to be tested rises and falls quickly to meet the experimental requirements, can better achieve the experimental purpose, improve the experimental ability, and shorten the experimental time. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of the structure of a power cycle test device for a power module provided by an embodiment of the present invention;

[0029] Figure 2 A schematic diagram of the structure of a cooling assembly provided by an embodiment of the present invention;

[0030] Figure 3 A cross-sectional view of a fixture provided by an embodiment of the present invention;

[0031] Figure 4 A front view of a fixture provided by an embodiment of the present invention;

[0032] Figure 5 The present invention provides a flowchart of a method for using a power cycle test device for a power module according to an embodiment of the present invention.

[0033] Reference numerals:

[0034] 100, power cycle test device; 200, power device to be tested;

[0035] 300, power cycle test equipment; 400, chiller;

[0036] 120, fixture; 130, cooling assembly;

[0037] 110, a controller; 131, a first solenoid valve;

[0038] 132, a second solenoid valve; 133, a third solenoid valve;

[0039] 134, a fourth solenoid valve; 135, a flow meter;

[0040] 121, rectangular body; 122, water inlet pipe;

[0041] 123, clamp.

[0042] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0043] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0044] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "circumferential", "radial" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0045] In order to enable those skilled in the art to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application.

[0046] In the embodiments of the present application, at least one refers to one or more; multiple refers to two or more. In the description of the present application, words such as "first", "second", "third", etc. are only used to distinguish the purpose of description, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying order. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0047] References to "one embodiment" or "some embodiments" etc. described in this specification mean that one or more embodiments of the present application include a particular feature, structure or characteristic described in conjunction with the embodiment. Thus, in this specification, the terms "include", "comprises", "has" and their variations all mean "including but not limited to", unless otherwise specifically emphasized.

[0048] Figure 1A schematic diagram of a power cycle test device 100 for a power module provided by an embodiment of the present invention is shown in FIG. Figure 1 As shown, the power cycle test device 100 includes: a controller 110, two parallel fixtures 120 and a cooling assembly 130, wherein the first end of the controller 110 is connected to the first end of the cooling assembly 130, the second end of the controller 110 is connected to the second end of the cooling assembly 130, the third end of the controller 110 is connected to one end of the fixture 120, the fourth end of the controller 110 is connected to the other end of the fixture 120, the third end of the cooling assembly 130 is used to be connected to the input end of the chiller 400, and the fourth end of the cooling assembly 130 is used to be connected to the output end of the chiller 400, wherein:

[0049] The fixture 120 is used to clamp N power devices 200 to be tested connected in series, and the power devices 200 to be tested are connected to a power cycle test device 300, where N is a positive integer;

[0050] The controller 110 is used to control the flow rate of the cooling assembly 130 when the power cycle test device 300 applies a load current to the power device 200 to be tested, so that the water flow rate flowing through the fixture 120 is less than a first preset threshold value, so that the power cycle test device 300 collects the parameters of the power device 200 to be tested;

[0051] It is used to control the flow of the cooling component 130 when the power cycle test equipment 300 shuts off the load current of the power device 200 under test, so that the water flow rate flowing through the tooling fixture 120 is greater than a second preset threshold value, so that the power cycle test equipment 300 can collect the parameters of the power device 200 under test.

[0052] An embodiment of the present invention provides a power cycle test device 100 for a power module. The power cycle test device 100 is mainly used to perform a power cycle experiment on a power module. The power module may be an IGBT (Insulate Gate Bipolar Transistor) power module or a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) power module, etc. In practical applications, vehicle-mounted power semiconductor modules often need to undergo minute-level power cycle experiments to test the wear and degradation of the modules under strong acceleration conditions, thereby predicting the service life of the power modules.

[0053] For the convenience of description, MOSFET is used as the power device 200 to be tested in this embodiment.

[0054] The power cycle testing device 100 includes a controller 110, two parallel-connected fixtures 120 and a cooling assembly 130. The controller 110 includes four ports, namely a first end, a second end, a third end and a fourth end. The first end of the controller 110 is connected to the first end of the cooling assembly 130, the second end of the controller 110 is connected to the second end of the cooling assembly 130, the third end of the controller 110 is connected to one end of the two parallel fixtures 120, and the fourth end of the controller 110 is connected to the other end of the two parallel fixtures 120.

[0055] In addition, the third end of the cooling component 130 is also connected to the input end of the chiller 400, and the fourth end of the cooling component 130 is connected to the output end of the chiller 400. The chiller 400 is mainly used to provide cold water to the cooling component 130. The chiller 400 can be provided by the external environment or included in the power cycle test device 100. The specific amount can be determined based on actual conditions, and the embodiment of the present invention does not make specific limitations on this.

[0056] Each fixture 120 holds N power devices 200 to be tested connected in series, wherein N is a positive integer, which may be 1 or more, and the power devices 200 to be tested are respectively connected to the power cycle test equipment 300. Generally, affected by the number of power devices connected in series each time by the power cycle test equipment 300, the maximum value of N in the existing power cycle test equipment 300 can only be 6, that is, N can be any one of 1, 2, 3, 4, 5, and 6.

[0057] When a power cycle test is performed on the power device 200 to be tested, the drain of the power device 200 to be tested is connected to the positive pole of the high current connection of the power tester (Power Tester) in the power cycle test equipment 300, and the source of the power device to be tested is connected to the negative pole of the high current connection of the power tester; the positive pole (Is+) end of the current sensor output signal of the sensor current cable (Sensor Current Cable) in the power cycle test equipment 300 is connected to the drain of the power device 200 to be tested, and the negative pole (Is- end) of the current sensor output signal of the sensor current cable in the power cycle test equipment 300 is connected to the source of the power device 200 to be tested.

[0058] It should be noted that the power cycle test device 300 is a device used to test the performance and reliability of electronic components, power modules, etc. under different power loading and unloading cycle conditions. The power cycle test device 300 includes various modules such as power source, load unit, temperature control system, data acquisition system, control system, etc. The power source is used to provide the required electrical power input for the test, which can be a DC power supply or an AC power supply, depending on the working environment of the object being tested; the load unit is used to simulate the load condition of the tested component in actual work, and the load can be resistive, inductive or capacitive, or a combination thereof; the temperature control system is used to accurately control the temperature of the test environment; the data acquisition system is used to collect data of various key parameters during the test, such as voltage, current, power, temperature, etc.; the control system is used to coordinate and control various parts of the power cycle test device 300.

[0059] During the power cycle experiment performed by the power cycle test device 100, when the power cycle test equipment 300 is used to perform a load current loading mode on the power device 200 to be tested, the controller 110 controls the flow of the cooling component 130 so that the water flow rate flowing through the fixture 120 is less than a first preset threshold value, that is, the water flow flowing through the fixture 120 is very small, and in the load current loading mode, the data acquisition system in the power cycle test equipment 300 collects the parameters of the power device 200 to be tested.

[0060] When the power cycle test equipment 300 is used to shut off the load current of the power device 200 under test, the controller 110 controls the flow of the cooling component 130 so that the water flow rate flowing through the fixture 120 is greater than the second preset threshold value, that is, the water flow rate flowing through the fixture 120 is very large, and the data acquisition system in the power cycle test equipment 300 collects the parameters of the power device 200 under test.

[0061] The first preset threshold and the second preset threshold can be determined according to actual conditions, and the embodiment of the present invention does not specifically limit this. In addition, the second preset threshold is greater than the first preset threshold.

[0062] It should also be noted that during the power cycle test method, the parameters collected by the power cycle test equipment 300 include: the loading time of the load current (referred to as ton), the off time of the load current (referred to as toff), the gate voltage (referred to as Vgate), the load current (referred to as IL), and the coolant flow rate (referred to as Qcool). The power cycle test equipment 300 monitors parameters such as the virtual junction temperature, the thermal resistance of the junction pair sinking, the collector-emitter voltage, etc. until the life of the power device 200 to be tested ends.

[0063] The present invention proposes a power cycle test device 100 for a power module. When the power cycle test device 100 is used to test a power device 200 to be tested, all the power devices 200 to be tested are connected in series and then fixed on a fixture 120. The power cycle test device 100 includes two parallel fixtures 120, so that a large number of power devices 200 to be tested can be placed in the two parallel fixtures 120. Multiple power devices 200 to be tested can be measured through one power cycle, which can improve the power cycle test efficiency.

[0064] In addition, when the load current is loaded, the controller 110 controls the flow of the cooling component 130 so that the water flow in the fixture 120 is very small or there is no water flow, thereby allowing the power device 200 under test to heat up quickly. When the load current is turned off, the controller 110 controls the flow of the cooling component 130 so that the water flow in the fixture 120 is large, thereby achieving rapid cooling.

[0065] The embodiment of the present invention greatly improves the connection power consumption loss of the power device 200 under test, and makes the shell temperature of the power device 200 under test rise and fall quickly to meet the experimental requirements, so as to better achieve the experimental purpose, improve the experimental ability and shorten the experimental time.

[0066] In some embodiments, the cooling assembly 130 includes a first solenoid valve 131, a second solenoid valve 132, a third solenoid valve 133 and a fourth solenoid valve 134, wherein:

[0067] One end of the first solenoid valve 131 is connected to the input end of the chiller 400 , and the other end of the first solenoid valve 131 is connected to the first end of the controller 110 ;

[0068] One end of the second solenoid valve 132 is connected to the input end of the chiller 400 , and the other end of the second solenoid valve 132 is connected to the first end of the controller 110 through the third solenoid valve 133 ;

[0069] One end of the fourth solenoid valve 134 is connected to the input end of the chiller 400 , and the other end of the fourth solenoid valve 134 is connected to the output end of the chiller 400 .

[0070] Figure 2 A schematic diagram of the structure of a cooling assembly 130 provided in an embodiment of the present invention is shown in FIG. Figure 2 As shown, the cooling assembly 130 includes a first solenoid valve 131, a second solenoid valve 132, a third solenoid valve 133 and a fourth solenoid valve 134. Figure 2IN represents the output end of the chiller 400, that is, the cold water in the chiller 400 goes out from this port and enters the cooling assembly 130, and OUT represents the input end of the chiller 400, that is, the water in the cooling assembly 130 flows into the chiller 400 from this port.

[0071] In an embodiment of the present invention, one end of the first solenoid valve 131 is connected to the input end of the chiller 400, the other end of the first solenoid valve 131 is connected to the first end of the controller 110, one end of the second solenoid valve 132 is connected to the input end of the chiller 400, the other end of the second solenoid valve 132 is connected to the first end of the controller 110 through the third solenoid valve 133, one end of the fourth solenoid valve 134 is connected to the input end of the chiller 400, and the other end of the fourth solenoid valve 134 is connected to the output end of the chiller 400.

[0072] Among them, the connection between the first solenoid valve 131, the second solenoid valve 132, the third solenoid valve 133, and the fourth solenoid valve 134 in the cooling component 130 is connected through a water pipe, so that the cold water in the chiller 400 enters the cooling component 130, and flows into the tooling fixture 120 after passing through the controller 110.

[0073] The controller 110 can control the first solenoid valve 131, the second solenoid valve 132, the third solenoid valve 133 and the fourth solenoid valve 134 respectively, so as to control the opening or closing of each solenoid valve to control the water flow through the fixture 120 in the cooling assembly 130 during the power cycle experiment.

[0074] As an example, the controller 110 is used to control the first solenoid valve 131 and the third solenoid valve 133 to close, and control the fourth solenoid valve 134 to open when the power cycle test equipment 300 applies load current to the power device under test 200 .

[0075] In the embodiment of the present invention, under the power cycle operation state, the power cycle test equipment 300 loads the load current to the power device to be tested 200, controls the first solenoid valve 131 and the third solenoid valve 133 to be closed, controls the fourth solenoid valve 134 to be opened, and the cold water in the chiller 400 flows according to the water flow direction 1, so that no water flows into the tooling fixture 120. When the load current is loaded, the power device to be tested 200 can be quickly heated up to meet the temperature requirements of the power cycle test.

[0076] As another example, the controller 110 is used to control the third solenoid valve 133 and the fourth solenoid valve 134 to close, and control the first solenoid valve 131 to open when the power cycle test equipment 300 applies load current to the power device under test 200 .

[0077] In the power cycle operation state, the power cycle test equipment 300 loads the load current to the power device to be tested 200, controls the third solenoid valve 133 and the fourth solenoid valve 134 to be closed, controls the first solenoid valve 131 to be opened, and the cold water in the chiller 400 flows according to the water flow direction 2, so that only a small amount of water flows into the tooling fixture 120, and the power device to be tested 200 can be quickly heated up when the load current is loaded.

[0078] In this case, the water flow in the jig 120 is less than the first preset threshold value, and the value of the first preset threshold value is very small. Although it cannot be guaranteed that there is no water flow in the jig 120, the power device 200 to be tested can be quickly heated up with a small amount of water flow to meet the temperature requirements of the power cycle test.

[0079] As an example, the controller 110 is used to control the third solenoid valve 133 and the second solenoid valve 132 to open, and control the first solenoid valve 131 and the fourth solenoid valve 134 to close when the power cycle test equipment 300 shuts off the load current of the power device under test 200.

[0080] When the power cycle is not in operation, the power cycle test equipment 300 shuts off the load current of the power device 200 to be tested, controls the third solenoid valve 133 and the second solenoid valve 132 to be opened, and controls the first solenoid valve 131 and the fourth solenoid valve 134 to be closed. The cold water in the chiller 400 flows along the water flow direction 3, and the water flow direction 3 supplies a large water flow to the main circuit, so that only a large amount of water flows into the tooling fixture 120, and the power device 200 to be tested can be cooled down quickly when the load current is shut off.

[0081] In summary, in the embodiment of the present invention, when the load current is loaded, the controller 110 controls the flow of the cooling component 130 so that the water flow in the fixture 120 is very small or there is no water flow, thereby allowing the power device 200 under test to heat up quickly. When the load current is turned off, the controller 110 controls the flow of the cooling component 130 so that the water flow in the fixture 120 is large, thereby achieving rapid cooling.

[0082] The embodiment of the present invention greatly improves the connection power consumption loss of the power device 200 under test, and makes the shell temperature of the power device 200 under test rise and fall quickly to meet the experimental requirements, so as to better achieve the experimental purpose, improve the experimental ability and shorten the experimental time.

[0083] In some embodiments, the cooling assembly 130 further includes a flow meter 135 , one end of the flow meter 135 is connected to the other end of the fourth solenoid valve 134 , and the other end of the flow meter 135 is connected to the second end of the controller 110 .

[0084] like Figure 2 As shown, the cooling assembly 130 further includes a flow meter 135, one end of which is connected to the other end of the fourth solenoid valve 134, and the other end of the flow meter 135 is connected to the second end of the controller 110. The flow meter 135 can monitor the water flow in the cooling assembly 130 and objectively display the size of the water flow.

[0085] In some embodiments, the tooling fixture 120 includes a rectangular body 121 with a hollow structure, a water inlet pipe 122 and a clamp 123, wherein the water inlet pipe 122 is located inside the rectangular body 121, the clamp 123 is located on the rectangular body 121 and above the water inlet pipe 122, and the clamp 123 is used to fix the power device 200 to be tested.

[0086] Figure 3 A cross-sectional view of a fixture 120 provided in an embodiment of the present invention, Figure 4 A front view of a fixture 120 provided in an embodiment of the present invention is shown as follows: Figure 3 and Figure 4 As shown, the fixture 120 includes a hollow rectangular body 121, a water inlet pipe 122 and a clamp 123. The water inlet pipe 122 is located inside the rectangular body 121, and the water inlet and the water outlet at both ends extend from the rectangular body 121. The clamp 123 is located above the water pipe and fixed on the rectangular body 121. The clamp 123 clamps the power device 200 to be tested, and the tail end of the power device 200 to be tested is close to the water inlet pipe 122. In this way, when water flows in the water inlet pipe 122, the heat in the power device 200 to be tested can be taken away, thereby achieving a rapid cooling result.

[0087] The fixture 120 further includes a sealing ring, a screw hole and a positioning hole. The sealing ring is used to seal the rectangular body 121 , the screw hole is used to fix the rectangular body 121 , and the positioning hole is used to displace the rectangular body 121 .

[0088] In some embodiments, the controller 110 is further configured to send a first instruction to enable the power cycle test device 300 to perform a thermal resistance test on the power device 200 to be tested.

[0089] In the embodiment of the present invention, the power device 200 to be tested is positioned on the fixture 120 to position the loading module and realize the water flow control function. The drain of the power device 200 to be tested is connected to the positive pole of the high current wiring of the Power Tester in the power cycle test equipment 300, and the source of the power device to be tested is connected to the negative pole of the high current wiring of the Power Tester; the Is+ end of the Sensor Current Cable in the power cycle test equipment 300 is connected to the drain of the power device 200 to be tested, and the Is- end of the Sensor Current Cable in the power cycle test equipment 300 is connected to the source of the power device 200 to be tested.

[0090] After the connection is completed, the controller 110 sends a first instruction to the power cycle test device 300. After receiving the first instruction, the power cycle test device 300 performs a thermal resistance test on the power device to be tested 200. The thermal resistance test requires testing the temperature-sensitive parameters of the power device to be tested 200, which is the voltage of the body diode between the drain and source of the power device to be tested 200.

[0091] The power device 200 to be tested is in a thermal resistance test state, and the power cycle test equipment 300 is in a power cycle OFF state. At this time, a negative gate voltage is applied to the power device 200 to be tested, and a negative test current is applied to the channel; the power device 200 to be tested is in a heating state of the thermal resistance test, and the power cycle test equipment 300 is in a power cycle ON state. At this time, a positive gate voltage is applied to the power device 200 to be tested, and a positive test current is applied to the channel. Finally, the power cycle test equipment 300 is used to collect the thermal resistance of the power device 200 to be tested.

[0092] In some embodiments, the controller 110 is further configured to send a second instruction to enable the power cycle test device 300 to measure the K factor of the power device 200 under test.

[0093] After the above connection is completed, the controller 110 sends a second instruction to the power cycle test device 300. After receiving the second instruction, the power cycle test device 300 measures the K coefficient of the power device to be tested 200. The electrical parameters with temperature-sensitive characteristics inside the power device to be tested 200 are found through electrical methods, and the change of junction temperature is obtained by measuring the change of the temperature-sensitive parameters. The K coefficient is the relationship between the calibrated temperature-sensitive parameters and temperature.

[0094] By using the power cycle test equipment 300, a constant current is applied to the power device 200 to be tested, and the temperature is changed to obtain a calibration curve of voltage versus temperature. Generally, the calibration curve of the device is linear, and the slope of this curve is called the K coefficient.

[0095] It should be noted that the first instruction and the second instruction are pre-agreed instructions, which can be specifically determined according to actual conditions, and the embodiment of the present invention does not specifically limit this.

[0096] Figure 5 A flowchart of a method for using a power cycle test device 100 for a power module provided by an embodiment of the present invention is shown in FIG. Figure 5 As shown, the method of use includes:

[0097] S510, clamping N power devices to be tested in series by the fixture, wherein the power devices to be tested are connected to a power cycle test device, where N is a positive integer;

[0098] S520, controlling, by the controller, the flow rate of the cooling assembly when the power cycle test device applies a load current to the power device under test, so that the water flow rate flowing through the fixture is less than a first preset threshold value, so that the power cycle test device collects parameters of the power device under test;

[0099] S530, when the power cycle test equipment shuts off the load current of the power device to be tested, controls the flow of the cooling assembly so that the water flow rate flowing through the fixture is greater than a second preset threshold value, so that the power cycle test equipment collects the parameters of the power device to be tested.

[0100] This embodiment is a method embodiment corresponding to the above-mentioned device embodiment, and its specific implementation process is the same as that of the above-mentioned method embodiment. For details, please refer to the above-mentioned device embodiment, and this method embodiment will not repeat it any more.

[0101] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0102] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A power cycle test device for a power module, characterized in that: It includes a controller, two parallel fixtures and a cooling assembly, wherein the first end of the controller is connected to the first end of the cooling assembly, the second end of the controller is connected to the second end of the cooling assembly, the third end of the controller is connected to one end of the fixture, the fourth end of the controller is connected to the other end of the fixture, the third end of the cooling assembly is used to connect to the input end of the chiller, and the fourth end of the cooling assembly is used to connect to the output end of the chiller, wherein: The fixture is used to clamp N power devices to be tested connected in series, and the power devices to be tested are connected to a power cycle test device, where N is a positive integer; The controller is used to control the flow rate of the cooling assembly when the power cycle test device applies a load current to the power device to be tested, so that the water flow rate flowing through the fixture is less than a first preset threshold value, so that the power cycle test device collects the parameters of the power device to be tested; Used to control the flow of the cooling component when the power cycle test equipment shuts off the load current of the power device to be tested, so that the water flow rate flowing through the tooling fixture is greater than a second preset threshold value, so that the power cycle test equipment can collect parameters of the power device to be tested.

2. The power cycle test device for a power module according to claim 1, characterized in that: The cooling assembly includes a first solenoid valve, a second solenoid valve, a third solenoid valve and a fourth solenoid valve, wherein: One end of the first solenoid valve is connected to the input end of the chiller, and the other end of the first solenoid valve is connected to the first end of the controller; One end of the second solenoid valve is connected to the input end of the chiller, and the other end of the second solenoid valve is connected to the first end of the controller through the third solenoid valve; One end of the fourth solenoid valve is connected to the input end of the chiller, and the other end of the fourth solenoid valve is connected to the output end of the chiller.

3. The power cycle test device for a power module according to claim 2, characterized in that: The controller is used for controlling the first solenoid valve and the third solenoid valve to close, and controlling the fourth solenoid valve to open, when the power cycle test equipment applies a load current to the power device to be tested.

4. The power cycle test device for a power module according to claim 2, characterized in that: The controller is used for controlling the third solenoid valve and the fourth solenoid valve to close, and controlling the first solenoid valve to open, when the power cycle test equipment applies a load current to the power device to be tested.

5. The power cycle test device for a power module according to claim 2, characterized in that: The controller is used for controlling the third solenoid valve and the second solenoid valve to open, and controlling the first solenoid valve and the fourth solenoid valve to close when the power cycle test equipment shuts off the load current of the power device to be tested.

6. The power cycle test device for a power module according to claim 2, characterized in that: The cooling assembly further includes a flow meter, one end of the flow meter is connected to the other end of the fourth solenoid valve, and the other end of the flow meter is connected to the second end of the controller.

7. The power cycle test device for a power module according to claim 1, characterized in that: The fixture comprises a rectangular body with a hollow structure, a water inlet pipe and a clamp, wherein the water inlet pipe is located inside the rectangular body, the clamp is located on the rectangular body and above the water inlet pipe, and the clamp is used to fix the power device to be tested.

8. The power cycle test device for a power module according to claim 6, characterized in that: The controller is further configured to send a first instruction so as to enable the power cycle test device to perform a thermal resistance test on the power device to be tested.

9. The power cycle test device for a power module according to claim 6, characterized in that: The controller is further configured to send a second instruction to enable the power cycle test device to measure the K factor of the power device to be tested.

10. A method for using the power cycle test device for a power module according to any one of claims 1 to 9, characterized in that: include: Clamp N power devices to be tested in series by the fixture, wherein the power devices to be tested are connected to a power cycle test device, and N is a positive integer; By means of the controller, when the power cycle test device applies a load current to the power device to be tested, the flow rate of the cooling assembly is controlled so that the water flow rate flowing through the fixture is less than a first preset threshold value, so that the power cycle test device collects the parameters of the power device to be tested; When the power cycle test equipment shuts off the load current of the power device under test, the flow of the cooling assembly is controlled so that the water flow rate flowing through the fixture is greater than a second preset threshold value, so that the power cycle test equipment can collect parameters of the power device under test.

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