A silicon carbide power device packaging structure and packaging process

Abstract

The present invention relates to the field of chip packaging technology, and discloses a silicon carbide power device packaging structure and packaging process, including a packaging table, wherein the top of the packaging table is rotatably connected to a turntable, a lower packaging box is fixed to the top edge array of the turntable, an annular rotating member is fixedly installed on the top of the turntable, an upper packaging box is arranged in an array on the annular rotating member, and a heater is embedded in the left half of the packaging table; a support assembly is fixedly installed on the top of the packaging table, a lifting drive member is arranged between the support assembly and the upper packaging box, a glue storage assembly is fixedly installed at the center of the support assembly, and a glue injection assembly is arranged in the glue storage assembly. When the upper cross bar and the lower cross bar slide along the lower arc bar, the two rubber ring pads fit together, and the lower packaging box and the upper packaging box enclose a packaging cavity; thus, after the silicon carbide power device is packaged, the appearance is the same as the shape of the packaging cavity, achieving the purpose of regular appearance.

Description

Technical Field

[0001] The present invention relates to the technical field of chip packaging, and in particular to a silicon carbide power device packaging structure and packaging process. Background Art

[0002] Silicon carbide power device is a semiconductor device based on silicon carbide material. Its basic structure includes two conductive types: P-type and N-type. By preparing PN junction or other special structures on the silicon carbide substrate, the functions of voltage control and current switching are achieved.

[0003] A Chinese patent application with an application date of March 26, 2024, and publication number CN118299291B discloses a semiconductor chip packaging device and packaging process, including a packaging platform, a packaging assembly provided on a surface of the packaging platform, and two symmetrically arranged kneading assemblies provided on a surface of the packaging assembly. By adjusting a distribution valve to communicate with a first boost branch pipe, and starting a boost pump, the boost pump pumps air into the boost main pipe. The air pumped into the boost main pipe enters the first boost branch pipe through the distribution valve, and is then pumped into the bottom and top packaging mold boxes through the bottom and top boost pipes, respectively. This increases the air pressure inside the bottom and top packaging mold boxes, thereby squeezing the bottom and top rubber-coated springs toward the center, wrapping and squeezing the polyetherether copper packaging colloid wrapped around the periphery of the semiconductor chip, compacting the colloid and improving the packaging and sealing effect of the semiconductor chip.

[0004] Although the above technical solution can improve the packaging and sealing effect of semiconductor chips, since the rubber-coated springs can be deformed and twisted during the packaging process, the appearance after packaging will be irregular, requiring additional shaping, which prolongs the production time. In addition, during packaging, only a single semiconductor chip can be packaged at a time, resulting in a slow production pace and low efficiency, and further improvements can be made. Summary of the Invention

[0005] (1) Technical problems solved

[0006] In response to the shortcomings of the existing technology, the present invention provides a silicon carbide power device packaging structure and packaging process, which has the advantages of regular appearance after packaging, continuous packaging, and high processing efficiency, solving the problems of irregular appearance after packaging, slow production pace, and low efficiency.

[0007] (2) Technical solution

[0008] In order to achieve the above-mentioned purpose of regular appearance and continuous packaging after packaging and high processing efficiency, the present invention provides the following technical solution: a silicon carbide power device packaging structure, comprising a packaging table, a turntable is rotatably connected to the top of the packaging table, a lower packaging box is fixed in an array on the top edge of the turntable, an annular rotating member is fixedly installed on the top of the turntable, an upper packaging box is arranged in an array on the annular rotating member, the upper packaging box is slidably connected to the annular rotating member along the vertical direction, the upper packaging box corresponds to the lower packaging box one by one, and the upper packaging box is located directly above the lower packaging box, and a heater is embedded in the left half of the packaging table; a support assembly is fixedly installed on the top of the packaging table, a lifting drive member is provided between the support assembly and the upper packaging box, the lifting drive member is used to drive the upper packaging box to move in the vertical direction, a glue storage assembly is fixedly installed at the center of the support assembly, a glue injection assembly is provided in the glue storage assembly, and the glue injection assembly is used to inject glue into the upper packaging box.

[0009] Preferably, a motor is fixedly mounted on the bottom of the packaging table, a gear 1 is fixedly mounted on the output end of the motor, the gear 1 is meshed with a gear 2, and the gear 2 is fixedly mounted at the bottom center of the turntable.

[0010] Preferably, the annular rotating member includes an outer ring and an inner ring fixedly mounted on the top of the turntable, the axes of the outer ring and the inner ring coincide with the axis of the turntable, and the outer ring is sleeved on the outside of the inner ring, the outer ring is provided with an array of guide grooves running through it, the guide grooves correspond one-to-one with the upper packaging box, and each of the guide grooves consists of two parallel linear grooves; the inner ring is provided with an array of glue injection holes running through it, the glue injection holes correspond one-to-one with the upper packaging box, and each of the glue injection holes consists of two through holes.

[0011] Preferably, a plurality of notches are reserved on opposite sides of the upper packaging box and the lower packaging box, and the notches are used to avoid the pins of the silicon carbide power device; a rubber ring pad is fixedly installed on opposite sides of the lower packaging box and the upper packaging box, an outer plywood is fixedly installed on one end of the inner side of the upper packaging box, two fixing tubes are fixedly installed on the other side of the outer plywood, and an inner plywood is fixedly installed on the other end of the two fixing tubes, the outer plywood and the inner plywood are clamped on the inner and outer walls of the outer ring, and the two fixing tubes are slidably connected to the guide groove; two connecting hoses are fixedly installed on the other side of the inner plywood, and the other end of the connecting hose is connected to the inner ring and communicated with the glue injection hole, and two guide holes are provided on the upper packaging box, the outer plywood and the inner plywood, and the guide holes are communicated with the upper packaging box, the fixing tube and the connecting hose.

[0012] Preferably, the support assembly includes four vertical rods fixedly installed on the top of the packaging table, two arc-shaped frames fixedly installed on the top of the four vertical rods, the two arc-shaped frames are distributed on the left and right, an arc-shaped channel is provided inside the arc-shaped frame, and a support ring is fixedly installed between the tops of the two arc-shaped frames.

[0013] Preferably, the lifting drive member includes two annular guide rails, which are distributed inside and outside; each annular guide rail includes a lower arc bar, an upper arc bar and two inclined arc bars, the position of the upper arc bar is higher than the position of the lower arc bar, and the two inclined arc bars are connected between the ends of the lower arc bar and the upper arc bar; an arc plate 1 is welded on the side surface of the lower arc bar, and an arc plate 2 is welded on the side surface of the upper arc bar, and the arc plate 1 and arc plate 2 are respectively welded on two arc frames; an arched plate is fixedly installed on the top of each upper packaging box, an upper cross bar is fixed through the top side of the arched plate, the upper cross bar is fitted with the top of the annular guide rail, a slider is slidably connected in the arched plate, a spring 1 is fixedly installed between the bottom of the slider and the upper packaging box, a lower cross bar is fixed through the slider, and the lower cross bar is fitted with the bottom of the annular guide rail.

[0014] Preferably, the glue storage assembly includes a retaining ring, which is fitted on the inner wall of the inner sleeve ring, and a sealing plate is fixedly installed on the top of the retaining ring. A glue injection pipe and a return pipe are connected to the left rear side of the inner wall of the retaining ring, and the glue injection pipe and the return pipe are connected to the glue injection hole; a glue storage cylinder is fixedly installed on the top of the sealing plate, and a filling port is provided at the eccentric top of the glue storage cylinder, the return pipe passes through the sealing plate, and the top end of the return pipe is connected to the eccentric top of the glue storage cylinder; an elastic piston is provided inside the retaining ring, and the elastic piston is located below the glue injection pipe.

[0015] Preferably, the elastic piston includes a piston plate slidably connected to the inside of the retaining ring, a spring 2 is fixed to the bottom array of the piston plate, a hollow plate is fixedly installed at the bottom of the spring 2, and the hollow plate is fixedly installed on the inner wall of the bottom end of the retaining ring.

[0016] Preferably, the glue injection assembly includes a transfer cylinder fixedly mounted at the top center of the sealing plate, the top side of the transfer cylinder is connected to an L-shaped tube, the bottom end of the L-shaped tube is connected to the top of the sealing plate, the transfer cylinder is connected to the retaining ring through the L-shaped tube, a one-way valve is provided on the bottom end of the L-shaped tube, and a through groove is opened through the bottom array of the transfer cylinder; a rotating shaft is rotatably connected through the center of the transfer cylinder, a spiral blade is fixedly mounted on the rotating shaft, and the pitch of the spiral blade gradually decreases from bottom to top, the rotating shaft is rotatably connected to the top center of the glue storage cylinder, a gear three is fixedly mounted on the top of the inner ring, the gear three is meshed with gear four, a connecting shaft is fixedly mounted at the top center of the gear four, the connecting shaft is rotatably connected to the support ring, sprockets are fixedly mounted on the top of the rotating shaft and the connecting shaft, and the two sprockets are connected by an annular chain.

[0017] A silicon carbide power device packaging process is characterized by the following specific steps:

[0018] S1, the motor drives gear 1 to rotate, which drives gear 2 and the turntable to rotate, and drives the outer ring and the inner ring to rotate synchronously with the turntable. The lower packaging box follows the turntable to make a circular motion, and the upper packaging box follows the outer ring to make a circular motion;

[0019] S2, when the inner ring rotates, it drives gear three to rotate, drives gear four and the connecting shaft to rotate, cooperates with the transmission effect of the sprocket and the ring chain, drives the rotating shaft and the spiral blade to rotate, so that the packaging glue at the bottom of the glue storage cylinder passes through the through groove and enters the transfer cylinder. The packaging glue inside the transfer cylinder enters the L-shaped tube under the pushing action of the spiral blade, and then enters the interior of the retaining ring. As the amount of packaging glue inside the retaining ring increases, the piston plate moves downward, and the spring 2 contracts to accumulate elasticity;

[0020] S3. As the upper packaging box makes a circular motion, the upper and lower cross bars are clamped on the upper and lower sides of the annular guide rail and slide. As the upper and lower cross bars slide along the upper arc bar, the upper and lower packaging boxes are separated. The packaged silicon carbide power device is placed into the lower packaging box. As the upper and lower cross bars slide along the lower arc bar, the two rubber ring gaskets fit together, and the lower and upper packaging boxes enclose a packaging cavity.

[0021] S4. When the upper cross bar and the lower cross bar slide to the rear end of the lower arc bar, the motor stops driving the gear 1 to rotate, and the turntable stops rotating. At this time, the glue injection tube and the return pipe are connected to the glue injection hole, and the piston plate moves upward under the elastic action of the spring 2. The encapsulating glue inside the retaining ring is squeezed by the piston plate and injected into the encapsulating cavity through the glue injection tube. The air inside the encapsulating cavity enters the glue storage cylinder through the return pipe. When the encapsulating glue inside the encapsulating cavity is filled with the encapsulating glue, the excess encapsulating glue flows back to the glue storage cylinder through the return pipe.

[0022] S5. Then, the motor drives gear 1 to rotate again, driving gear 2 and the turntable to rotate, so that the lower packaging box moves to the top of the heater. The heater heats the packaging glue inside the packaging cavity to solidify the packaging glue into shape.

[0023] S6. After that, the turntable continues to rotate, and when the upper cross bar and the lower cross bar slide along the inclined arc bar toward the upper arc bar, the upper packaging box and the lower packaging box are gradually separated, so that the packaged silicon carbide power device can be removed.

[0024] (3) Beneficial effects

[0025] Compared with the prior art, the present invention provides a silicon carbide power device packaging structure and packaging process, which has the following beneficial effects:

[0026] 1. The silicon carbide power device packaging structure and packaging process, wherein the motor drives gear 1 to rotate, drives gear 2 and the turntable to rotate, and drives the outer ring and the inner ring to rotate synchronously with the turntable, the lower packaging box follows the turntable to make a circular motion, and the upper packaging box follows the outer ring to make a circular motion; the upper cross bar and the lower cross bar are clamped on the upper and lower sides of the annular guide rail and slide, and when the upper cross bar and the lower cross bar slide along the upper arc bar, the upper packaging box and the lower packaging box are in a separated state, and the packaged silicon carbide power device is placed in the lower packaging box, and when the upper cross bar and the lower cross bar slide along the lower arc bar, the two rubber ring pads fit each other, and the lower packaging box and the upper packaging box enclose a packaging cavity; thus, after the silicon carbide power device is packaged, the appearance is the same as the shape of the packaging cavity, achieving the purpose of regular appearance;

[0027] 2. The silicon carbide power device packaging structure and packaging process are characterized by clamping the upper and lower cross bars on the upper and lower sides of the annular guide rail to slide. When the upper and lower cross bars slide along the upper arc bar, the upper packaging box and the lower packaging box are in a separated state. At this time, the packaged silicon carbide power device is placed in the lower packaging box. When the upper and lower cross bars slide along the lower arc bar, the two rubber ring pads fit each other, and the lower packaging box and the upper packaging box enclose a packaging cavity. The packaging glue can be injected into the packaging cavity. Then, as the turntable rotates, the lower packaging box moves to the top of the heater to solidify the packaging glue. After that, the upper packaging box and the lower packaging box are separated, and the packaged silicon carbide power device can be taken out. Therefore, the purpose of continuous packaging of silicon carbide power devices is achieved, and the processing efficiency is high.

[0028] 3. The silicon carbide power device packaging structure and packaging process: When the inner ring rotates, it drives gear three to rotate, drives gear four and the connecting shaft to rotate, and cooperates with the transmission effect of the sprocket and the ring chain to drive the rotating shaft and the spiral blade to rotate, so that the packaging glue at the bottom of the glue storage cylinder passes through the through groove and enters the transfer cylinder. The packaging glue inside the transfer cylinder is pushed by the spiral blade and enters the L-shaped tube. Thereafter, the packaging glue enters the interior of the retaining ring. As the amount of packaging glue inside the retaining ring increases, the piston plate moves downward, and the spring 2 contracts to accumulate elasticity. When the upper cross bar and the lower cross bar slide to the rear end of the lower arc bar, the motor stops driving gear one to rotate, and the turntable stops rotating. At this time, the glue injection tube and the return tube are connected to the glue injection hole, and the piston plate moves upward under the elastic action of spring two. The encapsulating glue inside the retaining ring is squeezed by the piston plate and injected into the encapsulating cavity through the glue injection tube. The air inside the encapsulating cavity enters the glue storage cylinder through the return tube. When the encapsulating cavity is filled with encapsulating glue, the excess encapsulating glue flows back to the glue storage cylinder through the return tube; thereby achieving the purpose of automatically perfusing the encapsulating glue. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the three-dimensional structure of a silicon carbide power device packaging structure proposed by the present invention;

[0030] Figure 2 This is a schematic diagram of the three-dimensional structure of a packaging platform and a supporting assembly of a silicon carbide power device packaging structure proposed by the present invention;

[0031] Figure 3 This is a schematic diagram of the three-dimensional structure of a silicon carbide power device packaging structure proposed by the present invention, with the packaging platform and support components removed;

[0032] Figure 4 This is a schematic diagram of the three-dimensional structure of a turntable, a lower packaging box, and an annular rotating member of a silicon carbide power device packaging structure proposed by the present invention;

[0033] Figure 5 This is a schematic diagram of the three-dimensional structure of the annular rotating member and the upper packaging box of the silicon carbide power device packaging structure proposed by the present invention;

[0034] Figure 6 This is a structural schematic diagram of a silicon carbide power device packaging structure proposed by the present invention, in which the upper packaging box and the lower packaging box are separated;

[0035] Figure 7 This is a schematic diagram of the three-dimensional structure of a lifting drive component of a silicon carbide power device packaging structure proposed by the present invention;

[0036] Figure 8 This is a schematic diagram of a three-dimensional cross-section structure of a glue storage component of a silicon carbide power device packaging structure proposed by the present invention;

[0037] Figure 9 This is a schematic diagram of the three-dimensional structure of a glue storage component of a silicon carbide power device packaging structure proposed by the present invention;

[0038] Figure 10 This is a schematic diagram of a three-dimensional cross-sectional structure of a glue injection component of a silicon carbide power device packaging structure proposed by the present invention;

[0039] Figure 11 This is a schematic diagram of the three-dimensional structure of the glue injection component of the silicon carbide power device packaging structure proposed by the present invention.

[0040] In the figure: 100, packaging table; 200, turntable; 300, lower packaging box; 400, annular rotating member; 500, upper packaging box; 600, support assembly; 700, lifting drive member; 800, glue storage assembly; 900, glue injection assembly;

[0041] 101, heater; 201, motor; 202, gear 1; 203, gear 2; 401, outer collar; 402, inner collar; 403, guide groove; 404, glue injection hole;

[0042] 501, rubber ring gasket; 502, outer splint; 503, fixed tube; 504, inner splint; 505, connecting hose; 506, diversion hole;

[0043] 601, vertical rod; 602, curved frame; 603, supporting ring;

[0044] 701, lower arc bar; 702, inclined arc bar; 703, upper arc bar; 704, arc plate 1; 705, arc plate 2; 706, arch plate; 707, upper crossbar; 708, slider; 709, spring 1; 710, lower crossbar;

[0045] 801, retaining ring; 802, sealing plate; 803, injection tube; 804, return pipe; 805, rubber storage cylinder; 806, filling port; 807, elastic piston; 8071, piston plate; 8072, spring 2; 8073, hollow plate;

[0046] 901. Transfer cylinder; 902. L-shaped tube; 903. One-way valve; 904. Through groove; 905. Rotating shaft; 906. Spiral blade; 907. Gear three; 908. Gear four; 909. Connecting shaft; 910. Sprocket; 911. Ring chain. DETAILED DESCRIPTION

[0047] In the description of this application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0048] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0049] See also Figures 1-4A silicon carbide power device packaging structure includes a packaging platform 100, with a turntable 200 rotatably connected to the top of the packaging platform 100. A motor 201 is fixedly mounted on the bottom of the packaging platform 100. Gear 1 202 is fixedly mounted on the output end of the motor 201. Gear 1 202 meshes with gear 2 203, which is fixedly mounted at the bottom center of the turntable 200. A drive shaft is fixed at the bottom center of the turntable 200. The drive shaft extends through the packaging platform 100 and is rotatably connected to the turntable 200. The turntable 200 is fixedly mounted to gear 2 203 via the drive shaft. The motor 201 drives gear 1 202 to rotate, which in turn drives gear 2 203, which in turn drives the turntable 200.

[0050] The lower packaging boxes 300 are fixed in an array on the top edge of the turntable 200. A circular rotating member 400 is fixedly mounted on the top of the turntable 200. Upper packaging boxes 500 are arranged in an array on the circular rotating member 400. The upper packaging boxes 500 are vertically slidably connected to the circular rotating member 400. The upper packaging boxes 500 correspond one-to-one with the lower packaging boxes 300 and are located directly above the lower packaging boxes 300. A heater 101 is embedded in the left half of the packaging stage 100. After the two rubber ring gaskets 501 are attached to each other, the silicon carbide power device to be packaged is wrapped. The packaging glue is then injected into the lower packaging box 300 and the upper packaging box 500. The heater 101 heats the turntable 200, thereby heating the packaging glue inside the lower packaging box 300 and the upper packaging box 500, causing the packaging glue to solidify and form.

[0051] A support assembly 600 is fixedly mounted on the top of the packaging table 100. A lifting drive 700 is disposed between the support assembly 600 and the upper packaging box 500. The lifting drive 700 is used to drive the upper packaging box 500 to move vertically. A glue storage assembly 800 is fixedly mounted at the center of the support assembly 600. The support assembly 600 is used to support the lifting drive 700 and the glue storage assembly 800. A glue injection assembly 900 is disposed within the glue storage assembly 800. The glue injection assembly 900 is used to inject glue into the upper packaging box 500.

[0052] See also Figure 4-Figure 5The annular rotating member 400 includes an outer ring 401 and an inner ring 402 fixedly mounted on the top of the turntable 200. The axes of the outer ring 401 and the inner ring 402 coincide with the axis of the turntable 200, and the outer ring 401 is sleeved on the outside of the inner ring 402, so that when the turntable 200 rotates, the outer ring 401 and the inner ring 402 rotate synchronously. The outer ring 401 is provided with an array of guide grooves 403 running through it. The guide grooves 403 correspond one-to-one with the upper packaging box 500, and each guide groove 403 consists of two parallel linear grooves. The glue injection holes 404 are used to guide the upper packaging box 500. The inner ring 402 is provided with an array of glue injection holes 404 running through it. The glue injection holes 404 correspond one-to-one with the upper packaging box 500, and each glue injection hole 404 consists of two through holes.

[0053] See also Figure 5-Figure 6 The upper and lower packaging boxes 500 and 300 have multiple notches on opposite sides, designed to accommodate the pins of the silicon carbide power device. Rubber ring gaskets 501 are fixedly installed on opposite sides of the lower and upper packaging boxes 300 and 500, with raised portions corresponding to the notches in the lower and upper packaging boxes 300 and 500, ensuring they rest tightly against the inner walls of the notches. The silicon carbide power device to be packaged is placed in the lower packaging box 300, with its pins embedded in the rubber ring gasket 501 at the top of the lower packaging box 300. When the upper packaging box 500 moves downward, the two rubber ring gaskets 501 fit together and cling tightly to the pin surfaces of the silicon carbide power device. This creates a packaging cavity enclosed by the lower and upper packaging boxes 300 and 500.

[0054] An outer clamping plate 502 is fixedly installed at one end of the inner side of the upper packaging box 500, and two fixed tubes 503 are fixedly installed on the other side of the outer clamping plate 502. The other ends of the two fixed tubes 503 are fixedly installed with an inner clamping plate 504. The outer clamping plate 502 and the inner clamping plate 504 are clamped on the inner and outer walls of the outer ring 401, and the two fixed tubes 503 are slidably connected to the guide groove 403; thereby, the upper packaging box 500 can stably move up and down relative to the outer ring 401.

[0055] Two connecting hoses 505 are fixedly mounted on the other side of the inner clamping plate 504. The other ends of the connecting hoses 505 are connected to the inner collar 402 and communicate with the glue injection hole 404. Two guide holes 506 are defined in the upper packaging box 500, the outer clamping plate 502, and the inner clamping plate 504. The guide holes 506 communicate with the upper packaging box 500, the fixed tube 503, and the connecting hoses 505. Thus, the upper packaging box 500 is connected to the two through holes of the glue injection hole 404 via the two connecting hoses 505.

[0056] See also Figure 2The support assembly 600 includes four vertical rods 601 fixedly installed on the top of the packaging table 100. Two arc-shaped frames 602 are fixedly installed on the top of the four vertical rods 601. The two arc-shaped frames 602 are distributed on the left and right. An arc-shaped channel is set inside the arc-shaped frame 602, and a support ring 603 is fixedly installed between the tops of the two arc-shaped frames 602.

[0057] See also Figure 6-Figure 7 The lifting drive 700 includes two annular guide rails, arranged in an inner and outer direction. Each annular guide rail comprises a lower curved bar 701, an upper curved bar 703, and two inclined curved bars 702. The upper curved bar 703 is positioned higher than the lower curved bar 701, and the two inclined curved bars 702 are connected between the ends of the lower curved bar 701 and the upper curved bar 703. The connection between the inclined curved bar 702 and the lower curved bar 701 and the upper curved bar 703 is an arc-shaped transition.

[0058] The lower arc strip 701 is welded with an arc plate 1 704 on its side, and the upper arc strip 703 is welded with an arc plate 2 705 on its side. The arc plate 1 704 and the arc plate 2 705 are respectively welded to the two arc frames 602. Thus, the two annular guide rails are suspended by the vertical rods 601 and the arc frames 602, so that the two annular guide rails are directly above the lower packaging box 300.

[0059] An arched plate 706 is fixedly installed on the top of each upper packaging box 500, and an upper cross bar 707 is fixed through the side of the top of the arched plate 706. The upper cross bar 707 fits on the top of the annular guide rail. A slider 708 is slidably connected inside the arched plate 706. A spring 709 is fixedly installed between the bottom of the slider 708 and the upper packaging box 500. A lower cross bar 710 is fixed through the slider 708. Due to the elasticity of the spring 709, the slider 708 and the lower cross bar 710 tend to move upward, so that the lower cross bar 710 fits on the bottom of the annular guide rail.

[0060] When the outer collar 401 rotates, it drives the upper packaging box 500 to perform a synchronous circular motion. The upper crossbar 707 and the lower crossbar 710 slide along the annular guide rail, causing the upper packaging box 500 to move up and down while performing a circular motion. Furthermore, when the upper crossbar 707 and the lower crossbar 710 slide along the lower arc strip 701, the upper packaging box 500 is in a lower position. At this time, the two rubber ring pads 501 fit together, and a packaging cavity is enclosed between the lower packaging box 300 and the upper packaging box 500. When the upper crossbar 707 and the lower crossbar 710 slide along the upper arc strip 703, the upper packaging box 500 and the lower packaging box 300 are separated.

[0061] See also Figure 8-Figure 9The glue storage assembly 800 includes a retaining ring 801, which fits against the inner wall of the inner collar 402. A sealing plate 802 is fixedly mounted on the top of the retaining ring 801, which seals the top of the retaining ring 801. A glue injection tube 803 and a return pipe 804 are connected to the left rear side of the inner wall of the retaining ring 801. The glue injection tube 803 and the return pipe 804 are connected to the glue injection hole 404. A glue storage barrel 805 is fixedly mounted on the top of the sealing plate 802, and the glue storage barrel 805 is fixed to the center of the support ring 603. The support assembly 600 thus supports the glue storage barrel 805, allowing the retaining ring 801 and the sealing plate 802 to be stably arranged inside the inner collar 402. When the inner ring 402 rotates, the retaining ring 801 seals the glue injection holes 404, and the glue injection holes 404 arranged in an array are connected to the glue injection tube 803 and the return tube 804 in sequence, so that the upper packaging box 500 arranged in an array is connected to the inside of the retaining ring 801 in sequence.

[0062] A filling port 806 is provided at the eccentric top of the glue storage barrel 805, which is used to replenish the packaging glue into the glue storage barrel 805. The reflux pipe 804 passes through the sealing plate 802, and the top of the reflux pipe 804 is connected to the eccentric top of the glue storage barrel 805. When the glue injection pipe 803 injects the packaging glue into the packaging cavity, the air inside the packaging cavity can enter the glue storage barrel 805 through the reflux pipe 804, and the excess packaging glue in the packaging cavity can also flow back to the glue storage barrel 805 through the reflux pipe 804.

[0063] An elastic piston 807 is disposed within the retaining ring 801 and is located below the injection tube 803. The elastic piston 807 comprises a piston plate 8071 slidably connected to the interior of the retaining ring 801. A second spring 8072 is fixed to the bottom of the piston plate 8071. A hollow plate 8073 is fixed to the bottom of the second spring 8072. The hollow plate 8073 is fixed to the inner wall of the bottom end of the retaining ring 801.

[0064] See also Figure 10-11The glue injection assembly 900 includes a transfer cylinder 901 fixedly mounted at the top center of the sealing plate 802. An L-shaped tube 902 is connected to the top side of the transfer cylinder 901. The bottom end of the L-shaped tube 902 is connected to the top of the sealing plate 802. The transfer cylinder 901 is connected to the retaining ring 801 through the L-shaped tube 902. A one-way valve 903 is provided at the bottom end of the L-shaped tube 902. A through slot 904 is formed through the bottom end of the transfer cylinder 901. A rotating shaft 905 is rotatably connected to the center of the transfer cylinder 901. The rotating shaft 905 is rotatably connected to the top center of the glue storage cylinder 805. A spiral blade 906 is fixedly mounted on the rotating shaft 905. When the rotating shaft 905 and the spiral blade 906 rotate, the encapsulating glue inside the transfer cylinder 901 is transported upward and injected into the retaining ring 801 through the L-shaped tube 902 and the one-way valve 903. The encapsulating glue in the bottom layer of the glue storage cylinder 805 is replenished into the interior of the transfer cylinder 901 through the through groove 904. The pitch of the spiral blade 906 gradually decreases from bottom to top. As the spiral blade 906 conveys the encapsulating glue, it gradually increases the squeezing force on the encapsulating glue, causing bubbles in the encapsulating glue to burst, preventing a large number of bubbles from entering the interior of the retaining ring 801 along with the encapsulating glue.

[0065] Gear three 907 is fixedly installed on the top of the inner ring 402, and gear three 907 is meshed with gear four 908. A connecting shaft 909 is fixedly installed at the center of the top of gear four 908. The connecting shaft 909 is rotatably connected to the supporting ring 603. Sprockets 910 are fixedly installed on the top of the rotating shaft 905 and the connecting shaft 909, and the two sprockets 910 are connected by a ring chain 911.

[0066] A silicon carbide power device packaging process, the specific steps are as follows:

[0067] S1. The motor 201 drives the gear 1 202 to rotate, which drives the gear 2 203 and the turntable 200 to rotate, and drives the outer ring 401 and the inner ring 402 to rotate synchronously with the turntable 200. The lower packaging box 300 follows the turntable 200 to make a circular motion, and the upper packaging box 500 follows the outer ring 401 to make a circular motion;

[0068] S2. When the inner ring 402 rotates, it drives the gear 3 907 to rotate, drives the gear 4 908 and the connecting shaft 909 to rotate, and cooperates with the transmission effect of the sprocket 910 and the ring chain 911 to drive the rotating shaft 905 and the spiral blade 906 to rotate, so that the packaging glue at the bottom of the glue storage cylinder 805 passes through the through groove 904 and enters the transfer cylinder 901. The packaging glue inside the transfer cylinder 901 is pushed by the spiral blade 906 and enters the L-shaped tube 902. After that, the packaging glue enters the interior of the retaining ring 801. As the amount of packaging glue inside the retaining ring 801 increases, the piston plate 8071 moves downward, and the spring 2 8072 contracts to accumulate elasticity;

[0069] S3. As the upper packaging box 500 makes a circular motion, the upper crossbar 707 and the lower crossbar 710 are clamped on the upper and lower sides of the annular guide rail and slide. As the upper crossbar 707 and the lower crossbar 710 slide along the upper arc bar 703, the upper packaging box 500 and the lower packaging box 300 are in a separated state. The packaged silicon carbide power device is placed into the lower packaging box 300. As the upper crossbar 707 and the lower crossbar 710 slide along the lower arc bar 701, the two rubber ring gaskets 501 fit together, and the lower packaging box 300 and the upper packaging box 500 enclose a packaging cavity.

[0070] S4, when the upper cross bar 707 and the lower cross bar 710 slide to the rear end of the lower arc bar 701, the motor 201 stops driving the gear 1 202 to rotate, and the turntable 200 stops rotating. At this time, the glue injection tube 803 and the return pipe 804 are connected to the glue injection hole 404, and the piston plate 8071 moves upward under the elastic action of the spring 2 8072. The packaging glue inside the retaining ring 801 is squeezed by the piston plate 8071 and injected into the packaging cavity through the glue injection tube 803. The air inside the packaging cavity enters the glue storage cylinder 805 through the return pipe 804. When the packaging cavity is filled with packaging glue, the excess packaging glue flows back to the glue storage cylinder 805 through the return pipe 804.

[0071] S5. Then, the motor 201 drives the gear 1 202 to rotate again, driving the gear 2 203 and the turntable 200 to rotate, so that the lower packaging box 300 moves to the top of the heater 101. The heater 101 heats the packaging glue inside the packaging cavity to solidify the packaging glue.

[0072] S6. Afterwards, the turntable 200 continues to rotate. When the upper crossbar 707 and the lower crossbar 710 slide along the inclined arc bar 702 toward the upper arc bar 703, the upper packaging box 500 and the lower packaging box 300 gradually separate, so that the packaged silicon carbide power device can be removed.

[0073] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A silicon carbide power device packaging structure, comprising a packaging platform (100), characterized in that: The top of the packaging platform (100) is rotatably connected to a turntable (200), a lower packaging box (300) is fixed in an array on the top edge of the turntable (200), a circular rotating member (400) is fixedly installed on the top of the turntable (200), an upper packaging box (500) is arranged in an array on the circular rotating member (400), the upper packaging box (500) is slidably connected to the circular rotating member (400) along a vertical direction, the upper packaging box (500) corresponds to the lower packaging box (300) one by one, and the upper packaging box (500) is located directly above the lower packaging box (300), and a heater (101) is embedded in the left half of the packaging platform (100); A support assembly (600) is fixedly mounted on the top of the packaging platform (100); a lifting drive member (700) is provided between the support assembly (600) and the upper packaging box (500); the lifting drive member (700) is used to drive the upper packaging box (500) to move in a vertical direction; a glue storage assembly (800) is fixedly mounted at the center of the support assembly (600); a glue injection assembly (900) is provided in the glue storage assembly (800); the glue injection assembly (900) is used to inject glue into the upper packaging box (500).

2. The silicon carbide power device packaging structure according to claim 1, wherein: A motor (201) is fixedly mounted on the bottom of the packaging table (100), a gear 1 (202) is fixedly mounted on the output end of the motor (201), the gear 1 (202) is meshed with a gear 2 (203), and the gear 2 (203) is fixedly mounted at the bottom center of the turntable (200).

3. The silicon carbide power device packaging structure according to claim 1, wherein: The annular rotating member (400) includes an outer ring (401) and an inner ring (402) fixedly mounted on the top of the turntable (200), wherein the axes of the outer ring (401) and the inner ring (402) coincide with the axis of the turntable (200), and the outer ring (401) is sleeved on the outside of the inner ring (402), and an array of guide grooves (403) are formed on the outer ring (401), wherein the guide grooves (403) correspond one-to-one to the upper packaging box (500), and each guide groove (403) is composed of two parallel linear grooves; The inner ring (402) is provided with an array of glue injection holes (404) running through it. The glue injection holes (404) correspond one-to-one to the upper packaging box (500), and each of the glue injection holes (404) consists of two through holes.

4. The silicon carbide power device packaging structure according to claim 1, wherein: A plurality of notches are reserved on opposite sides of the upper packaging box (500) and the lower packaging box (300), and the notches are used to avoid pins of the silicon carbide power device; The lower packaging box (300) and the upper packaging box (500) are both fixedly installed with rubber ring pads (501) on opposite sides, an outer clamping plate (502) is fixedly installed on one end of the inner side of the upper packaging box (500), two fixed tubes (503) are fixedly installed on the other side of the outer clamping plate (502), and the other ends of the two fixed tubes (503) are fixedly installed with inner clamping plates (504), the outer clamping plates (502) and the inner clamping plates (504) are clamped on the inner and outer walls of the outer ring (401), and the two fixed tubes (503) are slidably connected to the guide groove (403); Two connecting hoses (505) are fixedly installed on the other side of the inner clamping plate (504), and the other end of the connecting hose (505) is connected to the inner ring (402) and communicated with the glue injection hole (404). Two guide holes (506) are opened on the upper packaging box (500), the outer clamping plate (502) and the inner clamping plate (504), and the guide holes (506) are communicated with the upper packaging box (500), the fixed tube (503) and the connecting hose (505).

5. The silicon carbide power device packaging structure according to claim 1, wherein: The support assembly (600) comprises four vertical rods (601) fixedly mounted on the top of the packaging platform (100), two arc-shaped frames (602) fixedly mounted on the top of the four vertical rods (601), the two arc-shaped frames (602) being distributed on the left and right, an arc-shaped channel being arranged inside the arc-shaped frames (602), and a support ring (603) being fixedly mounted between the tops of the two arc-shaped frames (602).

6. The silicon carbide power device packaging structure according to claim 1, wherein: The lifting drive member (700) comprises two annular guide rails, which are distributed inside and outside; Each annular guide rail comprises a lower arc bar (701), an upper arc bar (703) and two inclined arc bars (702), wherein the position of the upper arc bar (703) is higher than that of the lower arc bar (701), and the two inclined arc bars (702) are connected between the ends of the lower arc bar (701) and the upper arc bar (703); The side of the lower arc strip (701) is welded with an arc plate 1 (704), and the side of the upper arc strip (703) is welded with an arc plate 2 (705). The arc plate 1 (704) and the arc plate 2 (705) are respectively welded to two arc frames (602); An arched plate (706) is fixedly installed on the top of each upper packaging box (500), an upper cross bar (707) is fixed through the top side of the arched plate (706), and the upper cross bar (707) is fitted on the top of the annular guide rail. A slider (708) is slidably connected inside the arched plate (706), and a spring (709) is fixedly installed between the bottom of the slider (708) and the upper packaging box (500), and a lower cross bar (710) is fixed through the slider (708), and the lower cross bar (710) is fitted on the bottom of the annular guide rail.

7. The silicon carbide power device packaging structure according to claim 1, wherein: The glue storage assembly (800) includes a retaining ring (801), the retaining ring (801) is attached to the inner wall of the inner ring (402), a sealing plate (802) is fixedly installed on the top of the retaining ring (801), and a glue injection pipe (803) and a return pipe (804) are connected to the left rear side of the inner wall of the retaining ring (801), and the glue injection pipe (803) and the return pipe (804) are in communication with the glue injection hole (404); A glue storage cylinder (805) is fixedly mounted on the top of the sealing plate (802), a filling port (806) is provided at an eccentric position on the top of the glue storage cylinder (805), the return pipe (804) passes through the sealing plate (802), and the top end of the return pipe (804) is connected to the eccentric position on the top of the glue storage cylinder (805); An elastic piston (807) is provided inside the retaining ring (801), and the elastic piston (807) is located below the glue injection tube (803).

8. The silicon carbide power device packaging structure according to claim 7, wherein: The elastic piston (807) includes a piston plate (8071) slidably connected to the inside of the retaining ring (801), a spring 2 (8072) is fixed in an array at the bottom of the piston plate (8071), a hollow plate (8073) is fixedly installed at the bottom of the spring 2 (8072), and the hollow plate (8073) is fixedly installed on the inner wall of the bottom end of the retaining ring (801).

9. The silicon carbide power device packaging structure according to claim 1, wherein: The glue injection assembly (900) includes a transfer cylinder (901) fixedly mounted at the top center of the sealing plate (802), an L-shaped tube (902) connected to the top side of the transfer cylinder (901), the bottom end of the L-shaped tube (902) connected to the top of the sealing plate (802), the transfer cylinder (901) is connected to the retaining ring (801) through the L-shaped tube (902), a one-way valve (903) is provided on the bottom end of the L-shaped tube (902), and a through groove (904) is provided through the bottom end of the transfer cylinder (901); The center of the transfer cylinder (901) is connected to a rotating shaft (905) through which rotation is provided. A spiral blade (906) is fixedly mounted on the rotating shaft (905). The pitch of the spiral blade (906) gradually decreases from bottom to top. The rotating shaft (905) is connected to the center of the top of the glue storage cylinder (805) through which rotation is provided. A gear three (907) is fixedly mounted on the top of the inner ring (402). The gear three (907) is engaged with a gear four (908). A connecting shaft (909) is fixedly mounted on the center of the top of the gear four (908). The connecting shaft (909) is connected to the supporting ring (603) through which rotation is provided. Sprockets (910) are fixedly mounted on the tops of the rotating shaft (905) and the connecting shaft (909). The two sprockets (910) are connected by an annular chain (911).

10. A silicon carbide power device packaging process, characterized in that: The specific steps are as follows: S1, the motor (201) drives the gear 1 (202) to rotate, thereby driving the gear 2 (203) and the turntable (200) to rotate, and driving the outer ring (401) and the inner ring (402) to rotate synchronously with the turntable (200), so that the lower packaging box (300) follows the turntable (200) to make a circular motion, and the upper packaging box (500) follows the outer ring (401) to make a circular motion; S2, when the inner ring (402) rotates, it drives the gear three (907) to rotate, drives the gear four (908) and the connecting shaft (909) to rotate, cooperates with the transmission effect of the sprocket (910) and the ring chain (911), drives the rotating shaft (905) and the spiral blade (906) to rotate, so that the packaging glue at the bottom of the glue storage cylinder (805) passes through the through groove (904) and enters the transfer cylinder (901). The packaging glue inside the transfer cylinder (901) enters the inside of the L-shaped tube (902) under the pushing effect of the spiral blade (906), and then the packaging glue enters the inside of the retaining ring (801). As the amount of packaging glue inside the retaining ring (801) increases, the piston plate (8071) moves downward, and the spring two (8072) contracts and accumulates elasticity; S3. When the upper packaging box (500) makes a circular motion, the upper cross bar (707) and the lower cross bar (710) are clamped on the upper and lower sides of the annular guide rail and slide. When the upper cross bar (707) and the lower cross bar (710) slide along the upper arc bar (703), the upper packaging box (500) and the lower packaging box (300) are in a separated state. The packaged silicon carbide power device is placed in the lower packaging box (300). When the upper cross bar (707) and the lower cross bar (710) slide along the lower arc bar (701), the two rubber ring pads (501) fit together, and the lower packaging box (300) and the upper packaging box (500) enclose a packaging cavity. S4. When the upper crossbar (707) and the lower crossbar (710) slide to the rear end of the lower arc bar (701), the motor (201) stops driving the gear 1 (202) to rotate, and the turntable (200) stops rotating. At this time, the glue injection tube (803) and the return tube (804) are connected to the glue injection hole (404), and the piston plate (8071) moves upward under the elastic action of the spring 2 (8072). The packaging glue inside the retaining ring (801) is squeezed by the piston plate (8071) and injected into the packaging cavity through the glue injection tube (803). The air inside the packaging cavity enters the glue storage cylinder (805) through the return tube (804). When the packaging cavity is filled with the packaging glue, the excess packaging glue flows back to the glue storage cylinder (805) through the return tube (804); S5. Afterwards, the motor (201) drives the gear 1 (202) to rotate again, driving the gear 2 (203) and the turntable (200) to rotate, so that the lower packaging box (300) moves to the top of the heater (101), and the packaging glue inside the packaging cavity is heated by the heater (101) to solidify the packaging glue into a shape; S6. Afterwards, the turntable (200) continues to rotate, and when the upper crossbar (707) and the lower crossbar (710) slide along the inclined arc bar (702) toward the upper arc bar (703), the upper packaging box (500) and the lower packaging box (300) gradually separate, so that the packaged silicon carbide power device can be removed.

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