Testing device and testing method for power device

Abstract

The invention discloses a testing device and a testing method for a power device. The testing device comprises a to-be-tested power device, a short-circuit configuration device and a control device, the to-be-tested power device is provided with a short-circuit protection circuit, a fault signal output interface and at least two phases of live wire terminals; the fault signal output interface is used for outputting a fault signal when the short-circuit protection circuit is triggered; the control device is provided with a fault signal input interface electrically connected with the fault signal output interface; the control device is configured to control the to-be-tested power device to stop working after the fault signal input interface receives a fault signal output by the fault signal output interface; the short-circuit configuration device is used for configuring at least part of the live wire terminals to be in short-circuit connection; at least part of the live wire terminals are configured to be in short-circuit connection through the short-circuit configuration device, so that when the short-circuit protection circuit is tested, the fault signal transmission function between the fault signal output interface and the fault signal input interface is shielded, and the ultimate continuous short-circuit capacity of the device is verified.

Description

Technical Field

[0001] The present invention relates to the field of semiconductor technology, and in particular to a testing device and a testing method for a power device. Background Art

[0002] Intelligent Power Module (IPM) is mainly composed of power switching device IGBT (insulated gate bipolar transistor), which has the advantages of high current density, low saturation voltage and high voltage resistance.

[0003] As a commonly used electronic device, the performance of intelligent power module is affected by multiple factors, among which the ultimate short-circuit capability of the intelligent power module is an important indicator.

[0004] In the application test of intelligent power modules, a single short-circuit test is performed to verify whether the performance of the intelligent power module meets the application requirements. However, the existing short-circuit test method cannot verify the ultimate short-circuit capacity of the intelligent power module. Summary of the invention

[0005] A series of simplified concepts are introduced in the Summary of the Invention, which will be further described in detail in the Detailed Description of the Invention. The Summary of the Invention does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0006] The present application aims to address the deficiencies in the prior art, and its main purpose is to provide a testing device for a power device to verify the ultimate continuous short-circuit capability of the power device.

[0007] To achieve the above objectives, this application adopts the following technical solutions:

[0008] In response to the current problems, an embodiment of the present invention provides, on one hand, a test device for a power device, the test device comprising: a power device to be tested, a short-circuit configuration device and a control device; wherein the power device to be tested has a short-circuit protection circuit, a fault signal output interface and at least two-phase live wire terminals; the fault signal output interface is used to output a fault signal when the short-circuit protection circuit is triggered; the control device has a fault signal input interface for being electrically connected to the fault signal output interface; the control device is configured to: after the fault signal input interface receives the fault signal output by the fault signal output interface, control the power device to be tested to stop working; the short-circuit configuration device is used to configure at least some of the live wire terminals as short-circuit connections; when the short-circuit configuration device configures at least some of the live wire terminals as short-circuit connections to test the short-circuit protection circuit, shield the fault signal transmission function between the fault signal output interface and the fault signal input interface.

[0009] The above-mentioned embodiment has the following beneficial effects: when the short-circuit configuration device configures at least part of the live wire terminals as a short-circuit connection to test the short-circuit protection circuit, by shielding the fault signal transmission function between the fault signal output interface and the fault signal input interface, the short-circuit protection circuit of the power device to be tested is completely relied on to withstand the impact of continuous short circuits and perform short-circuit protection, thereby effectively verifying the short-circuit capability of the power device to be tested, and realizing testing of the short-circuit protection circuit of the power device to be tested without external software protection, effectively testing the short-circuit tolerance and robustness of the power device to be tested, thereby being able to verify the ultimate continuous short-circuit capability of the power device to be tested.

[0010] In some embodiments, another power device testing device is provided to shield a fault signal transmission function between a fault signal output interface and a fault signal input interface, including: disconnecting the electrical connection between the fault signal output interface and the fault signal input interface.

[0011] The above embodiment has the following beneficial effects: by directly disconnecting the electrical connection between the fault signal output interface and the fault signal input interface, the fault signal transmission function between the fault signal output interface and the fault signal input interface cannot be performed, thereby simplifying the difficulty of shielding the fault signal transmission function between the fault signal output interface and the fault signal input interface, and facilitating operation.

[0012] In some embodiments, another power device testing device is provided to shield a fault signal transmission function between a fault signal output interface and a fault signal input interface, including: a control device is configured to: configure the fault signal input interface to a high level state.

[0013] The above embodiment has the following beneficial effects: the fault signal input interface is pulled to a high level state by the control device, and even if the fault signal input interface and the fault signal output interface are electrically connected, the fault signal input interface cannot receive the fault signal sent by the fault signal output interface, thereby eliminating the need to disconnect the electrical connection between the fault signal output interface and the fault signal input interface, and facilitating operation.

[0014] In some embodiments, another power device testing device is provided, wherein the power device to be tested is used to be electrically connected to a DC power supply; the control device is configured to: output a PWM signal to the power device to be tested to control the power device to be tested to convert the DC power input by the DC power supply into AC power and output the AC power from the live wire terminal; and, when the short-circuit configuration device configures at least some of the live wire terminals to be short-circuited to test the short-circuit protection circuit, continuously output the PWM signal to the power device to be tested.

[0015] The above-mentioned embodiment has the following beneficial effects: when the short-circuit configuration device configures at least part of the live wire terminals to be short-circuited for testing the short-circuit protection circuit, the control device continuously outputs a PWM signal to the power device to be tested, so that the power device to be tested does not stop the current conversion function of converting DC to AC, and performs a short-circuit test on the short-circuit protection circuit of the power device to be tested, thereby effectively testing the short-circuit tolerance and robustness of the power device to be tested, thereby being able to verify the ultimate continuous short-circuit capability of the power device to be tested.

[0016] In some embodiments, another power device testing device is provided, wherein the power device to be tested comprises: at least two first switch tubes and at least two second switch tubes; the first current-passing end of each first switch tube is electrically connected to a DC power supply; each first switch tube corresponds to a live wire terminal, and the second current-passing end of each first switch tube is electrically connected to the corresponding live wire terminal; each second switch tube corresponds to a first switch tube; the first current-passing end of each second switch tube is electrically connected to the second current-passing end of the corresponding first switch tube, and the second current-passing end of each second switch tube is electrically connected to a short-circuit protection circuit; wherein the power device to be tested is configured to: control the conduction and disconnection of the first switch tube and the second switch tube based on a PWM signal.

[0017] The above-mentioned embodiment has the following beneficial effects: when the short-circuit configuration device configures at least part of the live wire terminals as a short-circuit connection to test the short-circuit protection circuit, the control device continuously outputs a PWM signal to the power device to be tested, and the power device to be tested controls the on and off of the first switch tube and the second switch tube based on the PWM signal to verify the ability of the short-circuit protection circuit to withstand continuous short-circuit impacts, effectively testing the short-circuit tolerance and robustness of the power device to be tested, thereby being able to verify the ultimate continuous short-circuit capability of the power device to be tested.

[0018] In some embodiments, another power device testing device is provided, and the short-circuit protection circuit includes: a sampling resistor and a sampling current input pin, the first end of the sampling resistor is electrically connected to the second current-passing ends of all the second switch tubes, and the second end of the sampling resistor is electrically connected to the reference ground end; the sampling current input pin is electrically connected to the first end of the sampling resistor.

[0019] The above embodiment has the following beneficial effects: by setting a sampling resistor in the short-circuit protection circuit to collect the current at the second current-passing end of the second switch tube, it is convenient to monitor whether the power device to be tested has overcurrent, and timely trigger the short-circuit protection circuit to work.

[0020] In some embodiments, another power device testing device is provided, and the short-circuit protection circuit also includes: a comparator, electrically connected to a sampling current input pin, for comparing a sampling current input from the sampling current input pin with a preset threshold; and when the comparison result of the comparator is that the sampling current is greater than the preset threshold, the short-circuit protection circuit is triggered.

[0021] The above embodiment has the following beneficial effects: by setting a comparator, the sampling circuit comparing the current input pin input is greater than a preset threshold, and when it is greater than the preset threshold, the short-circuit protection circuit is triggered to work, thereby simplifying the trigger judgment process of the short-circuit protection circuit.

[0022] On the other hand, an embodiment of the present invention provides a method for testing a power device, which includes: shielding a fault signal transmission function between a fault signal output interface of the power device to be tested and a fault signal input interface of a control device; and using a short-circuit configuration device to configure at least part of the live wire terminals of the power device to be tested as a short-circuit connection to test the short-circuit protection circuit of the power device to be tested.

[0023] The above-mentioned embodiment has the following beneficial effects: when the short-circuit configuration device configures at least part of the live wire terminals as a short-circuit connection to test the short-circuit protection circuit, by shielding the fault signal transmission function between the fault signal output interface and the fault signal input interface, the short-circuit protection circuit of the power device to be tested is completely relied on to withstand the impact of continuous short circuits and perform short-circuit protection, thereby effectively verifying the short-circuit capability of the power device to be tested, and realizing testing of the short-circuit protection circuit of the power device to be tested without external software protection, effectively testing the short-circuit tolerance and robustness of the power device to be tested, thereby being able to verify the ultimate continuous short-circuit capability of the power device to be tested.

[0024] In some embodiments, another method for testing a power device is provided, which further includes: when the short-circuit configuration device configures at least some of the live wire terminals to be short-circuited to test the short-circuit protection circuit, the control device continuously outputs a PWM signal to the power device to be tested; wherein the PWM signal is used to control the power device to be tested to convert the DC power input by the DC power supply into AC power, and output the AC power from the live wire terminal.

[0025] The above embodiment has the following beneficial effects: by directly disconnecting the electrical connection between the fault signal output interface and the fault signal input interface, the fault signal transmission function between the fault signal output interface and the fault signal input interface cannot be performed, thereby simplifying the difficulty of shielding the fault signal transmission function between the fault signal output interface and the fault signal input interface, and facilitating operation.

[0026] In some embodiments, another power device testing method is provided to shield a fault signal transmission function between a fault signal output interface of the power device to be tested and a fault signal input interface of a control device, including: disconnecting the electrical connection between the fault signal output interface and the fault signal input interface; and / or the control device configures the fault signal input interface to a high level state.

[0027] The above embodiment has the following beneficial effects: the fault signal input interface is pulled to a high level state by the control device, and even if the fault signal input interface and the fault signal output interface are electrically connected, the fault signal input interface cannot receive the fault signal sent by the fault signal output interface, thereby eliminating the need to disconnect the electrical connection between the fault signal output interface and the fault signal input interface, and facilitating operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The following drawings of the present invention are used to understand the present invention as part of the present invention. The embodiments of the present invention are shown in the drawings and the description thereof is used to explain the principle of the present invention.

[0029] In the attached figure:

[0030] Figure 1 A schematic block diagram of a power device testing device according to a specific embodiment of the present invention is shown;

[0031] Figure 2 A circuit diagram of a power device testing device according to a specific embodiment of the present invention is shown;

[0032] Figure 3 A circuit diagram showing a circuit for disconnecting a fault signal input interface and a fault signal output interface in a specific embodiment of the present invention is shown;

[0033] Figure 4 A circuit diagram showing a circuit in which a fault signal input interface is configured to be in a high level state in a specific embodiment of the present invention is shown;

[0034] Figure 5 A schematic flow chart of a method for testing a power device according to a specific embodiment of the present invention is shown. DETAILED DESCRIPTION

[0035] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is apparent to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some technical features well known in the art are not described.

[0036] It should be understood that the present invention can be implemented in different forms and should not be construed as being limited to the embodiments presented herein. On the contrary, providing these embodiments will make the disclosure thorough and complete and fully convey the scope of the present invention to those skilled in the art. In the accompanying drawings, the sizes and relative sizes of layers and regions may be exaggerated for clarity. The same reference numerals throughout represent the same elements.

[0037] It should be understood that when an element or layer is referred to as being "on, adjacent to, connected to or coupled to other elements or layers, it may be directly on, adjacent to, connected to or coupled to other elements or layers, or there may be intervening elements or layers. In contrast, when an element is referred to as being "directly on, directly adjacent to, directly connected to or directly coupled to other elements or layers, there may be no intervening elements or layers. It should be understood that, although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present invention, the first element, component, region, layer or part discussed below may be represented as a second element, component, region, layer or part.

[0038] Spatially relative terms such as "under," "beneath," "below," "under," "above," "above," and the like may be used herein for ease of description to describe the relationship of an element or feature shown in the figures to other elements or features. It should be understood that the spatially relative terms are intended to include different orientations of the device in use and operation in addition to the orientations shown in the figures. For example, if the device in the accompanying drawings is flipped, then the elements or features described as "under other elements" or "under" or "under" will be oriented as "on" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. The device may be otherwise oriented (rotated or otherwise) and the spatial descriptors used herein are interpreted accordingly.

[0039] The purpose of the terms used herein is only to describe specific embodiments and is not intended to be limiting of the present invention. When used herein, the singular forms "one", "an" and "said / the" are also intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "consisting of" and / or "comprising", when used in this specification, determine the presence of the features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0040] First, let's introduce the application scenarios of power devices. Power devices can be devices such as but not limited to IPM (intelligent power devices). Power devices include switching devices such as IGBT, which are three-terminal switching devices. The power devices can be applied to electronic products such as but not limited to laptops, desktop computers, tablet computers, mobile terminals, smart wearable devices, inverters, power factor correction circuits, voltage converters, etc.

[0041] In some embodiments, reference Figure 1 and Figure 2 A power device test device is proposed, the test device comprising: a power device to be tested 100, a short circuit configuration device 300 and a control device 200; wherein the power device to be tested 100 has a short circuit protection circuit 102, a fault signal output interface 101 (such as Figure 2-Figure 4 The FO pin in the figure represents a fault signal output interface 101) and at least two-phase live wire terminals 103 (such as Figure 1 FireWire terminal 1031 and FireWire terminal 1032 in, and Figure 2-Figure 4 U\V\M in the figure all represent live wire terminals 103); the fault signal output interface 101 is used to output a fault signal when the short circuit protection circuit 102 is triggered; the control device 200 has a fault signal input interface (such as Figure 2-Figure 4 The IPM-FO interface in the figure represents a fault signal input interface); the control device 200 is configured to: after the fault signal input interface receives the fault signal output by the fault signal output interface 101, control the power device 100 to be tested to stop working; the short-circuit configuration device 300 is used to configure at least part of the live wire terminals 103 as a short-circuit connection; when the short-circuit configuration device 300 configures at least part of the live wire terminals 103 as a short-circuit connection to test the short-circuit protection circuit 102, shield the fault signal transmission function between the fault signal output interface 101 and the fault signal input interface.

[0042] The above embodiment has the following beneficial effects: when the short-circuit configuration device 300 configures at least part of the live wire terminals 103 as a short-circuit connection to test the short-circuit protection circuit 102, by shielding the fault signal transmission function between the fault signal output interface 101 and the fault signal input interface, the short-circuit protection circuit 102 of the power device to be tested 100 is completely dependent on itself to withstand the impact of continuous short circuits and perform short-circuit protection, thereby effectively verifying the short-circuit capability of the power device to be tested 100, and realizing testing of the short-circuit protection circuit 102 of the power device to be tested 100 without external software protection, effectively testing the short-circuit tolerance and robustness of the power device to be tested 100, thereby being able to verify the ultimate continuous short-circuit capability of the power device to be tested 100.

[0043] Regarding the method of shielding the fault signal transmission function between the fault signal output interface 101 and the fault signal input interface, various methods may be adopted, and some methods are exemplarily introduced as follows.

[0044] In some embodiments, another power device testing device is provided to shield the fault signal transmission function between the fault signal output interface 101 and the fault signal input interface, referring to Figure 3 , which may include: disconnecting the electrical connection between the fault signal output interface 101 and the fault signal input interface.

[0045] The above embodiment has the following beneficial effects: by directly disconnecting the electrical connection between the fault signal output interface 101 and the fault signal input interface, the fault signal transmission function between the fault signal output interface 101 and the fault signal input interface cannot be performed, thereby simplifying the difficulty of shielding the fault signal transmission function between the fault signal output interface 101 and the fault signal input interface and facilitating operation.

[0046] In some embodiments, when a short-circuit test is performed on the power device to be tested 100, the electrical connection between the fault signal output interface 101 of the power device to be tested 100 and the fault signal input interface of the control device 200 may be disconnected to shield the fault signal transmission function between the fault signal output interface 101 and the fault signal input interface. After the short-circuit test is performed on the power device to be tested 100, the fault signal output interface 101 of the power device to be tested 100 and the fault signal input interface of the control device 200 may be electrically connected again to restore the corresponding function.

[0047] In some embodiments, another power device testing device is provided, referring to Figure 4 , shielding the fault signal transmission function between the fault signal output interface 101 and the fault signal input interface, including: the control device 200 is configured to: configure the fault signal input interface to a high level state.

[0048] The above embodiment has the following beneficial effects: the fault signal input interface is pulled up to a high level state by the control device 200, and even if the fault signal input interface and the fault signal output interface 101 are electrically connected, the fault signal input interface cannot receive the fault signal sent by the fault signal output interface 101, thereby eliminating the need to disconnect the electrical connection between the fault signal output interface 101 and the fault signal input interface, and facilitating operation.

[0049] In some embodiments, reference Figure 4 , the fault signal input interface (IPM-FO) can be connected through at least one resistor (such as Figure 4 The resistor R5 in the figure) and the DC power supply (exemplarily, it can be Figure 4 The DC5V in the fault signal input interface is pulled up to a high level state so that the fault signal input interface cannot receive the fault signal sent by the fault signal output interface 101.

[0050] In some embodiments, the high level device may be in a high level state of 5V, and of course may also be in other high level states that can distinguish a low level.

[0051] In some embodiments, another power device testing device is provided, referring to Figure 3 and Figure 4 The power device under test 100 is used to electrically connect a DC power supply (for example, the DC power supply may be Figure 2-Figure 4 The control device 200 is configured to: output a PWM signal to the power device 100 to be tested, so as to control the power device 100 to be tested to convert the DC power input by the DC power supply into AC power, and output the AC power from the live terminal 103; and, when the short-circuit configuration device 300 configures at least part of the live terminals 103 to be short-circuited to test the short-circuit protection circuit 102, continuously output the PWM signal to the power device 100 to be tested.

[0052] The above embodiment has the following beneficial effects: when the short-circuit configuration device 300 configures at least part of the live wire terminals 103 to be short-circuited to test the short-circuit protection circuit 102, the control device 200 continuously outputs PWM signals to the power device 100 to be tested, so that the power device 100 to be tested does not stop the current conversion function of DC to AC, and performs a short-circuit test on the short-circuit protection circuit 102 of the power device 100 to be tested, effectively testing the short-circuit tolerance and robustness of the power device 100 to be tested, thereby verifying the ultimate continuous short-circuit capability of the power device 100 to be tested. Since the external control device 200 cannot receive the fault signal output by the power device 100 to be tested in the continuous short-circuit, it will always output the PWM signal normally, so that the power device 100 to be tested can work normally, which can examine the continuous short-circuit tolerance of the power device 100 to be tested.

[0053] In some embodiments, another power device testing device is provided, referring to Figure 3-Figure 4 The power device to be tested 100 includes: at least two first switch tubes (such as Figure 2-Figure 4 Q1-Q3 in the figure all represent first switch tubes) and at least two second switch tubes (such as Figure 2-Figure 4 Q4-Q6 in the figure all represent second switch tubes); the first flow end of each first switch tube is electrically connected to a DC power supply; each first switch tube corresponds to a live wire terminal 103, and the second flow end of each first switch tube is electrically connected to the corresponding live wire terminal 103; each second switch tube corresponds to a first switch tube; the first flow end of each second switch tube is electrically connected to the second flow end of the corresponding first switch tube, and the second flow end of each second switch tube (such as Figure 2-Figure 4 NU, NV, and NW represent the second current-passing end of the second switch tube) and are electrically connected to the short-circuit protection circuit 102; wherein the power device to be tested 100 is configured to: control the on and off of the first switch tube and the second switch tube based on the PWM signal.

[0054] The above embodiment has the following beneficial effects: when the short-circuit configuration device 300 configures at least part of the live wire terminals 103 to be short-circuited to test the short-circuit protection circuit 102, the control device 200 continuously outputs a PWM signal to the power device to be tested 100, and the power device to be tested 100 controls the on and off of the first switch tube and the second switch tube based on the PWM signal to verify the ability of the short-circuit protection circuit 102 to withstand continuous short-circuit impacts, effectively testing the short-circuit tolerance and robustness of the power device to be tested 100, thereby being able to verify the ultimate continuous short-circuit capability of the power device to be tested 100.

[0055] In some embodiments, reference Figure 2 The number of the first switch tubes is three, and the three first switch tubes form a high-side circuit. The three first switch tubes and the high-side gate drive circuit 104 (such as Figure 2-Figure 4 The HVIC in the figure represents a high-side gate drive circuit 104). The power device to be tested 100 is provided with three pins for receiving PWM signals for controlling respective first switch tubes. Figure 2 HINU, HINV, and HINW in the figure represent pins for receiving PWM signals for controlling the three first switch tubes. Correspondingly, the control device 200 may be provided with three pins for sending PWM signals for controlling the three first switch tubes, see Figure 2-Figure 4 PWM UH, PWM VH, and PWM WH in the figure represent pins used to send PWM signals for controlling the three first switch tubes.

[0056] In some embodiments, reference Figure 2 , the number of the second switch tubes is three, the three second switch tubes form a low-side circuit, and the three second switch tubes and the low-side gate drive circuit 105 (such as Figure 2-Figure 4 LVIC in the figure represents a low-side gate drive circuit 105). The power device to be tested 100 is provided with three pins for receiving PWM signals for controlling respective second switch tubes. Figure 2 LINU, LINV, and LINW in the figure represent pins for receiving PWM signals for controlling the three second switch tubes. Correspondingly, the control device 200 may be provided with three pins for sending PWM signals for controlling the three second switch tubes, see Figure 2-Figure 4 PWM UL, PWM VL, and PWM WL represent pins used to send PWM signals for controlling the three second switch tubes.

[0057] In some embodiments, another power device testing device is provided, referring to Figure 2 The short-circuit protection circuit 102 includes: a sampling resistor and a sampling current input pin, the first end of the sampling resistor is electrically connected to the second current-passing ends of all the second switch tubes, and the second end of the sampling resistor is electrically connected to the reference ground end; the sampling current input pin is electrically connected to the first end of the sampling resistor.

[0058] The above embodiment has the following beneficial effects: by setting a sampling resistor in the short-circuit protection circuit 102 to collect the current at the second current-passing end of the second switch tube, it is convenient to monitor whether the power device 100 to be tested has overcurrent, and timely trigger the short-circuit protection circuit 102 to work.

[0059] In some embodiments, reference Figure 2 , R1 represents a sampling resistor, ITRIP represents a sampling current input pin, a first end of the sampling resistor is electrically connected to the second current-passing ends (NU, NV, NW) of all the second switch tubes, and a second end of the sampling resistor is electrically connected to a reference ground end; the sampling current input pin is electrically connected to the first end of the sampling resistor.

[0060] In some embodiments, reference Figure 2 , you can also connect a filter circuit between the sampling resistor R1 and the sampling current input pin, refer to Figure 2 The capacitor C2 and the resistor R2 in the circuit form a filter circuit, which is used to filter the sampling signal to prevent interference.

[0061] In some embodiments, another power device testing device is provided, and the short-circuit protection circuit 102 also includes: a comparator (not shown in the figure), electrically connected to the sampling current input pin, and used to compare the sampling current input from the sampling current input pin with the size of a preset threshold; and when the comparison result of the comparator is that the sampling current is greater than the preset threshold, the short-circuit protection circuit 102 is triggered.

[0062] The above embodiment has the following beneficial effects: by setting a comparator, the sampling circuit of the current input pin is compared to see whether it is greater than a preset threshold, and when it is greater than the preset threshold, the short-circuit protection circuit 102 is triggered to work, so as to simplify the trigger judgment process of the short-circuit protection circuit 102.

[0063] In some embodiments, reference Figure 2 The power device under test 100 may further include a coupling capacitor pin (CFO), which is connected to the reference ground terminal through a coupling capacitor C1.

[0064] In some embodiments, reference Figure 2 The power supply of the power device 100 to be tested can be a DC15V power supply, and a voltage stabilizing circuit 106 can be provided between the DC15V power supply and the VCC (power supply pin) of the power device 100 to be tested, so as to improve the stability of the reference voltage output by the VCC power supply pin.

[0065] In some embodiments, reference Figure 2 The live wire terminal 103 is used to be electrically connected to a load to supply power to the load. The load may be any type of AC load.

[0066] In some embodiments, reference Figure 2 When the fault signal output interface 101 and the fault signal input interface are electrically connected, they can be electrically connected through a current limiting resistor R4.

[0067] In some embodiments, reference Figure 2 The fault signal output interface 101 can be connected to a DC5V DC power supply through the resistor R3 to transmit the fault signal to the fault signal input interface.

[0068] In some embodiments, the fault signal may be a high level signal, or may be other types of signals.

[0069] In some embodiments, the short circuit configuration device 300 may use a relay, and different high voltage terminals of the relay are connected to the live terminal 103. The short circuit configuration of the high voltage live terminal 103 is achieved through the low voltage control contact of the relay, thereby improving safety.

[0070] In some embodiments, the number of live terminals 103 is three-phase, namely U\V\W. At this time, the short-circuit configuration device 300 can short-circuit the three-phase live terminals 103 together when performing a short-circuit test. Of course, the short-circuit configuration device 300 can also select any two-phase live terminals 103 for short-circuiting.

[0071] Another aspect of the present invention provides a method for testing a power device, referring to Figure 1 , Figure 2 and Figure 5 , the test method mainly includes:

[0072] In S501, shielding the fault signal transmission function between the fault signal output interface 101 of the power device to be tested 100 and the fault signal input interface of the control device 200;

[0073] In S502 , the short-circuit configuration device 300 is used to configure at least part of the live terminals 103 of the power device 100 to be short-circuited, so as to test the short-circuit protection circuit 102 of the power device 100 to be tested.

[0074] The above embodiment has the following beneficial effects: when the short-circuit configuration device 300 configures at least part of the live wire terminals 103 as a short-circuit connection to test the short-circuit protection circuit 102, by shielding the fault signal transmission function between the fault signal output interface 101 and the fault signal input interface, the short-circuit protection circuit 102 of the power device to be tested 100 is completely dependent on itself to withstand the impact of continuous short circuits and perform short-circuit protection, thereby effectively verifying the short-circuit capability of the power device to be tested 100, and realizing testing of the short-circuit protection circuit 102 of the power device to be tested 100 without external software protection, effectively testing the short-circuit tolerance and robustness of the power device to be tested 100, thereby being able to verify the ultimate continuous short-circuit capability of the power device to be tested 100.

[0075] In some embodiments, another method for testing a power device is provided, referring to Figure 3 The test method also includes: when the short-circuit configuration device 300 configures at least part of the live wire terminals 103 to be short-circuited to test the short-circuit protection circuit 102, the control device 200 continuously outputs a PWM signal to the power device under test 100; wherein the PWM signal is used to control the power device under test 100 to convert the DC power input by the DC power supply into AC power and output the AC power from the live wire terminal 103.

[0076] The above embodiment has the following beneficial effects: by directly disconnecting the electrical connection between the fault signal output interface 101 and the fault signal input interface, the fault signal transmission function between the fault signal output interface 101 and the fault signal input interface cannot be performed, thereby simplifying the difficulty of shielding the fault signal transmission function between the fault signal output interface 101 and the fault signal input interface and facilitating operation.

[0077] Regarding the method of shielding the fault signal transmission function between the fault signal output interface 101 of the power device under test 100 and the fault signal input interface of the control device 200 , various methods may be adopted.

[0078] In some embodiments, another method for testing a power device is provided, referring to Figure 3 and Figure 4 , shielding the fault signal transmission function between the fault signal output interface 101 of the power device under test 100 and the fault signal input interface of the control device 200, may include: disconnecting the electrical connection between the fault signal output interface 101 and the fault signal input interface; and / or, the control device 200 configures the fault signal input interface to a high level state.

[0079] The above embodiment has the following beneficial effects: the fault signal input interface is pulled up to a high level state by the control device 200, and even if the fault signal input interface and the fault signal output interface 101 are electrically connected, the fault signal input interface cannot receive the fault signal sent by the fault signal output interface 101, thereby eliminating the need to disconnect the electrical connection between the fault signal output interface 101 and the fault signal input interface, and facilitating operation.

[0080] The present invention has been described by the above embodiments, but it should be understood that the above embodiments are only for the purpose of example and description, and are not intended to limit the present invention to the scope of the described embodiments. In addition, it can be understood by those skilled in the art that the present invention is not limited to the above embodiments, and more variations and modifications can be made according to the teachings of the present invention, and these variations and modifications all fall within the scope of the protection claimed by the present invention. The protection scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A power device testing device, characterized in that: include: The power device to be tested has a short-circuit protection circuit, a fault signal output interface and at least two-phase live wire terminals; wherein the fault signal output interface is used to output a fault signal when the short-circuit protection circuit is triggered; A control device having a fault signal input interface electrically connected to the fault signal output interface; the control device is configured to: after the fault signal input interface receives the fault signal output by the fault signal output interface, control the power device to be tested to stop working; and, A short circuit configuration device, used to configure at least some of the live wire terminals to be short-circuited; Wherein, when the short-circuit configuration device configures at least part of the live wire terminals to be short-circuited to test the short-circuit protection circuit, the fault signal transmission function between the fault signal output interface and the fault signal input interface is shielded.

2. The testing device according to claim 1, characterized in that: The shielding of the fault signal transmission function between the fault signal output interface and the fault signal input interface includes: Disconnect the electrical connection between the fault signal output interface and the fault signal input interface.

3. The testing device according to claim 1, characterized in that: The shielding of the fault signal transmission function between the fault signal output interface and the fault signal input interface includes: The control device is configured to: configure the fault signal input interface to a high level state.

4. The testing device according to claim 1, characterized in that: The power device to be tested is used to be electrically connected to a DC power supply; The control device is configured to: Outputting a PWM signal to the power device under test to control the power device under test to convert the direct current input by the direct current power supply into alternating current, and outputting the alternating current from the live wire terminal; as well as, When the short-circuit configuration device configures at least part of the live wire terminals to be short-circuited to test the short-circuit protection circuit, the PWM signal is continuously output to the power device to be tested.

5. The testing device according to claim 4, characterized in that: The power device to be tested comprises: At least two first switch tubes, each of which has a first current-passing end electrically connected to the DC power supply; each of which corresponds to one live wire terminal, and each of which has a second current-passing end electrically connected to the corresponding live wire terminal; and at least two second switch tubes, each of which corresponds to one of the first switch tubes; the first current-passing end of each of the second switch tubes is electrically connected to the second current-passing end of the corresponding first switch tube, and the second current-passing end of each of the second switch tubes is electrically connected to the short-circuit protection circuit; Wherein, the power device to be tested is configured to: control the on and off of the first switch tube and the second switch tube based on the PWM signal.

6. The testing device according to claim 5, characterized in that: The short circuit protection circuit comprises: A sampling resistor, wherein a first end of the sampling resistor is electrically connected to the second current-passing ends of all the second switch tubes, and a second end of the sampling resistor is electrically connected to a reference ground end; The sampling current input pin is electrically connected to the first end of the sampling resistor.

7. The testing device according to claim 6, characterized in that: The short circuit protection circuit also includes: A comparator is electrically connected to the sampling current input pin and is used to compare the sampling current input from the sampling current input pin with a preset threshold value; and when the comparison result of the comparator is that the sampling current is greater than the preset threshold value, the short-circuit protection circuit is triggered.

8. A method for testing a power device, characterized in that: include: Shielding the fault signal transmission function between the fault signal output interface of the power device to be tested and the fault signal input interface of the control device; A short-circuit configuration device is used to configure at least part of the live wire terminals of the power device to be tested to be short-circuited, so as to test the short-circuit protection circuit of the power device to be tested.

9. The testing method according to claim 8, characterized in that: Also includes: When the short-circuit configuration device configures at least part of the live wire terminals to be short-circuited to test the short-circuit protection circuit, the control device continuously outputs a PWM signal to the power device to be tested; The PWM signal is used to control the power device under test to convert the direct current input by the direct current power supply into alternating current, and output the alternating current from the live wire terminal.

10. The testing method according to claim 8, characterized in that: The function of shielding the fault signal transmission between the fault signal output interface of the power device to be tested and the fault signal input interface of the control device includes: disconnecting the electrical connection between the fault signal output interface and the fault signal input interface; and / or, The control device configures the fault signal input interface to a high level state.

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