Lossless scanning positioning structure of IGBT power device

Abstract

The utility model discloses a lossless scanning and positioning structure for an IGBT power device. The lossless scanning and positioning structure comprises a positioning area formed on a non-functional area of the IGBT power device; the positioning sheet is arranged in the positioning area, forms at least two sheet-shaped structures with specified shapes and can prevent X-rays from penetrating through the sheet-shaped structures. According to the utility model, the positioning areas are designed in the non-functional areas at the upper and lower ends of the IGBT power device in the length direction, and positioning is carried out by searching the positioning sheets arranged in the positioning areas during lossless scanning. According to the utility model, the positioning sheet is designed into different shapes, and the resistance X-ray of the positioning sheet passes through the positioning sheet to form a pattern with a shape corresponding to that of the positioning sheet in a scanned image. The number, the shape and the corresponding arrangement combination of the positioning sheets can be designed in a targeted manner, so that IGBT power devices of different models or different IGBT power devices of the same model can be distinguished through the number, the shape and the corresponding arrangement combination of the positioning sheets, accurate positioning is realized, and false detection or missing detection is avoided.

Description

Technical Field

[0001] The utility model relates to the field of semiconductors, in particular to a lossless scanning and positioning structure for an IGBT power device. Background Art

[0002] Power device nondestructive scanning is a testing technology primarily used to assess the internal quality of power devices and ensure their reliability and performance. Power device nondestructive scanning primarily includes ultrasonic nondestructive testing, scanning acoustic microscopy, optical microscanning microthermography systems, and X-ray nondestructive testing.

[0003] During X-ray nondestructive testing (NDT), IGBT power devices must be positioned so that the resulting pattern, after X-ray scanning, is unique within the search box for accurate detection and judgment. Because the patterns of individual IGBT power devices are repetitive, they can easily become misaligned when performing large numbers of scans, leading to missed or incorrect detections. Therefore, a positioning solution that can accurately locate the IGBT power device under inspection during X-ray NDT is urgently needed. Utility Model Content

[0004] The Summary of the Utility Model introduces a series of simplified concepts, which are simplifications of existing technologies in the field and are further described in detail in the Detailed Description of the Utility Model. The Summary of the Utility Model of this utility model is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0005] The technical problem to be solved by the utility model is to provide an IGBT power device non-destructive scanning and positioning structure for X-ray non-destructive testing, which can accurately position the IGBT power device to be tested.

[0006] In order to solve the above technical problems, the utility model provides an IGBT power device lossless scanning and positioning structure, comprising:

[0007] Positioning area 1, which is formed on the non-functional area 2 of the IGBT power device 1; the non-functional area is the area on the IGBT power device that does not directly participate in the function realization, and these areas do not directly contribute to the electrical performance of the circuit;

[0008] The positioning sheet 3 , which is arranged in the positioning area 1 , is formed into a sheet-like structure of at least two designated shapes, which can prevent X-rays from passing through.

[0009] Preferably, the non-destructive scanning positioning structure of the IGBT power device is further improved, and the positioning piece 3 is a tungsten piece.

[0010] Preferably, the lossless scanning positioning structure of the IGBT power device is further improved, the number of positioning pieces 3 of the same shape is one, and the number of shapes of the positioning pieces 3 is at least two.

[0011] Preferably, the IGBT power device lossless scanning positioning structure is further improved, the number of positioning pieces 3 of the same shape is at least 2, the positioning pieces 3 of the same shape are arranged together, and a specified interval is formed between the positioning pieces 3 of the same shape.

[0012] Preferably, the IGBT power device lossless scanning positioning structure is further improved, the number of positioning pieces 3 of the same shape is at least 2, the number of positioning pieces 3 of different shapes is the same, and each positioning piece 3 has a different shape from its surrounding adjacent positioning pieces 3.

[0013] Preferably, the non-destructive scanning positioning structure of the IGBT power device is further improved, and the shape of the positioning piece 3 is circular, triangular, trapezoidal, elliptical or rectangular.

[0014] Preferably, the non-destructive scanning positioning structure of the IGBT power device is further improved, and the shape of the positioning piece 3 is a regular polygon.

[0015] Preferably, the non-destructive scanning positioning structure of the IGBT power device is further improved, and the positioning piece 3 is in a dumbbell shape, a shuttle shape, a teardrop shape or a capsule shape.

[0016] Preferably, the non-destructive scanning positioning structure of the IGBT power device is further improved, and the positioning area 1 is formed on the non-functional area 2 at least at one of the upper and lower ends in the length direction of the IGBT power device.

[0017] Preferably, the non-destructive scanning positioning structure of the IGBT power device is further improved, and the number and shape of the positioning pieces 3 arranged in each IGBT power device positioning area 1 are different.

[0018] The working principle of this utility model is as follows:

[0019] The present invention designs positioning areas in the non-functional areas at the upper and lower ends of the length direction of the IGBT power device, and positioning is performed by searching for positioning pieces arranged in the positioning areas during non-destructive scanning. The positioning pieces of the present invention are designed to have different shapes, and when X-rays pass through the positioning pieces, a pattern of the corresponding shape of the positioning pieces will be formed in the scanned image. Since the number, shape and corresponding arrangement combination of the positioning pieces can be designed in a targeted manner, different models of IGBT power devices or different IGBT power devices of the same model can be distinguished by the number, shape and corresponding arrangement combination of the positioning pieces, thereby achieving accurate positioning and avoiding false detection or missed detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings of the present invention are intended to illustrate the general characteristics of the methods, structures and / or materials used in specific exemplary embodiments of the present invention, supplementing the description in the specification. However, the drawings of the present invention are schematic diagrams not drawn to scale and may not accurately reflect the precise structure or performance characteristics of any given embodiment. The drawings of the present invention should not be interpreted as defining or limiting the range of values ​​or properties covered by the exemplary embodiments of the present invention. The present invention is further described in detail below in conjunction with the drawings and specific embodiments:

[0021] Figure 1 It is a structural schematic diagram of the first embodiment of the present utility model.

[0022] Figure 2 This is a schematic diagram of the positioning area arrangement of the third embodiment of the present utility model.

[0023] Figure 3 This is a schematic diagram of the positioning area arrangement of the third embodiment of the present utility model.

[0024] Figure 4 This is a schematic diagram of the positioning area arrangement of the fourth embodiment of the present utility model.

[0025] Description of Reference Numerals

[0026] Positioning area 1

[0027] Non-functional area 2

[0028] Positioning piece 3

[0029] IGBT power device 4. DETAILED DESCRIPTION

[0030] The following describes the implementation of the present invention through specific embodiments. Those skilled in the art can fully understand the other advantages and technical effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through different specific embodiments. The details in this specification can also be applied based on different viewpoints and various modifications or changes can be made without departing from the overall design concept of the utility model. It should be noted that, unless there is a conflict, the following embodiments and the features therein can be combined with each other. The following exemplary embodiments of the present invention can be implemented in a variety of different forms and should not be interpreted as being limited to the specific embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of the present invention thorough and complete, and to fully convey the technical solutions of these exemplary embodiments to those skilled in the art. It should be understood that when an element is referred to as being "connected" or "coupled" to another element, the element can be directly connected or coupled to the other element, or there can be an intermediate element. In contrast, when an element is referred to as being "directly connected" or "directly coupled" to another element, there is no intermediate element. The same figure numbers always represent the same elements throughout the drawings.

[0031] First embodiment;

[0032] refer to Figure 1 As shown, the utility model provides a non-destructive scanning and positioning structure for an IGBT power device, comprising:

[0033] A positioning area 1 formed on a non-functional area 2 of the IGBT power device 1;

[0034] A positioning sheet 3 is arranged in the positioning area 1 and is formed into a sheet structure of at least two specified shapes, which can prevent X-rays from passing through. Preferably, the positioning sheet 3 is a tungsten sheet;

[0035] The positioning area 1 is formed on the non-functional area 2 at at least one of the upper and lower ends of the lengthwise direction of the IGBT power device 4. That is, the positioning area 1 of each IGBT power device can be the same or different; the case where the positioning area 1 of each IGBT power device is the same is easy to understand and will not be described in detail. For the case where the positioning area 1 of each IGBT power device is different, the following examples are illustrative:

[0036] Their positioning areas 1 may have different sizes or shapes. For example, the positioning areas 1 may be rectangular, but the positioning areas 1 of adjacent IGBT power devices may have different sizes or shapes. Alternatively, the difference in positioning areas 1 may be a combination of the size and shape of the positioning areas 1. Accordingly, the difference in positioning areas 1 may be between adjacent IGBT power devices.

[0037] Based on the design principle of the first embodiment described above, the present invention provides a number of subsequent preferred embodiments.

[0038] Second embodiment;

[0039] The second embodiment of the utility model is based on the design principle of the first embodiment. The design of the positioning area 1 can be any of the above cases. The main improvement of the second embodiment on the basis of the first embodiment lies in the design of the positioning piece. The same parts will not be repeated here.

[0040] Continue to refer Figure 1 As shown, the number of positioning pieces 3 of the same shape is one, and the number of positioning pieces 3 of shapes is at least two.

[0041] For example, in the positioning area 1 , a rectangular tungsten sheet and a triangular tungsten sheet are adjacently designed.

[0042] Optionally, the square tungsten sheet and the triangular tungsten sheet may not be adjacent to each other, but may be disposed at both ends of the positioning area.

[0043] For further improvement, a rectangular tungsten sheet, a triangular tungsten sheet and a circular tungsten sheet can be designed;

[0044] For further improvement, a rectangular tungsten sheet, a triangular tungsten sheet, a circular tungsten sheet and a square tungsten sheet can be designed; the shape and type of the tungsten sheet can be selected according to actual needs and actual layout space, and the positions between the tungsten sheets can be selected according to actual needs and actual layout space to form different arrangements and combinations, and clearly mark the positioning.

[0045] Third embodiment;

[0046] The third embodiment of the utility model is based on the design principle of the first embodiment. The design of the positioning area 1 can be any of the above cases. The main improvement of the third embodiment on the basis of the first embodiment lies in the design of the positioning piece. The same parts will not be repeated here.

[0047] refer to Figure 2 As shown, the number of the positioning pieces 3 of the same shape is at least 2, and the positioning pieces 3 of the same shape are arranged together, with a specified interval formed between the positioning pieces 3 of the same shape.

[0048] For example, on one side of the positioning area 1 , four square tungsten sheets arranged in a matrix are designed.

[0049] Accordingly, reference Figure 3 As shown, when the positioning pieces 3 have two or more shapes, the positioning pieces 3 of the same shape are arranged together in a matrix.

[0050] Fourth embodiment;

[0051] The fourth embodiment of the utility model is based on the design principle of the first embodiment. The design of the positioning area 1 can be any of the above cases. The main improvement of the third embodiment on the basis of the first embodiment lies in the design of the positioning piece. The same parts will not be repeated here.

[0052] refer to Figure 4 As shown, the number of the positioning pieces 3 of the same shape is at least 2, the number of the positioning pieces 3 of different shapes is the same, and each positioning piece 3 has a different shape from the surrounding adjacent positioning pieces 3 .

[0053] By combining the shapes or positions of the positioning pieces 3, the IGBT power device under test can be quickly and accurately located, and a specific device or even a specific end of the device can be located, thus avoiding false detection and missed detection in the case of repeated patterns.

[0054] Preferably, the first to fourth embodiments are further improved;

[0055] The shape of the positioning piece 3 can also be selected to be a trapezoid, an ellipse, a dumbbell, a spindle, a teardrop, a capsule or a regular polygon (such as a regular pentagon).

[0056] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by those skilled in the art to which the present invention belongs. It will also be understood that, unless expressly defined herein, terms such as those defined in general dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, rather than being interpreted in an ideal or overly formal sense.

[0057] The present invention has been described in detail above through specific implementation methods and examples, but these do not constitute limitations of the present invention. Without departing from the principles of the present invention, those skilled in the art may make many variations and improvements, which should also be considered as the scope of protection of the present invention.

Claims

1. A non-destructive scanning and positioning structure for an IGBT power device, characterized in that: include: A positioning area (1) formed on a non-functional area (2) of an IGBT power device; The positioning sheet (3) is arranged in the positioning area (1) and is formed into a sheet-like structure of at least two specified shapes, which can prevent X-rays from passing through.

2. The IGBT power device non-destructive scanning and positioning structure according to claim 1, wherein: The positioning piece (3) is a tungsten piece.

3. The non-destructive scanning and positioning structure for an IGBT power device according to claim 1, wherein: The number of positioning pieces (3) of the same shape is one, and the types of shapes of the positioning pieces (3) are at least two.

4. The non-destructive scanning and positioning structure for an IGBT power device according to claim 1, wherein: The number of positioning pieces (3) of the same shape is at least 2, and the positioning pieces (3) of the same shape are arranged together, with a specified interval formed between the positioning pieces (3) of the same shape.

5. The non-destructive scanning and positioning structure for an IGBT power device according to claim 1, wherein: The number of positioning pieces (3) of the same shape is at least 2, the number of positioning pieces (3) of different shapes is the same, and each positioning piece (3) has a different shape from the surrounding adjacent positioning pieces (3).

6. The IGBT power device non-destructive scanning and positioning structure according to claim 2, wherein: The shape of the positioning piece (3) is circular, triangular, trapezoidal, elliptical or rectangular.

7. The IGBT power device non-destructive scanning and positioning structure according to claim 2, wherein: The shape of the positioning piece (3) is a regular polygon.

8. The non-destructive scanning and positioning structure for an IGBT power device according to claim 2, wherein: The shape of the positioning piece (3) is dumbbell-shaped, spindle-shaped, teardrop-shaped or capsule-shaped.

9. The non-destructive scanning and positioning structure for an IGBT power device according to any one of claims 1 to 8, characterized in that: The positioning area (1) is formed on the non-functional area (2) at least one of the upper and lower ends in the length direction of the IGBT power device.

10. The non-destructive scanning and positioning structure for an IGBT power device according to any one of claims 1 to 8, characterized in that: The number and shape of the positioning pieces (3) arranged in each IGBT power device positioning area (1) are different.

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