AC soft starter
By adopting a printed circuit board and metal heat-conducting plate design in the AC soft starter, directly mounting the thyristor chip and configuring the conductive and heat-conducting wiring area, the high cost problem is solved, better heat dissipation performance and current flow are achieved, and the overall cost is reduced.
Patent Information
- Application Number
- CN202422787118.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-15
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-11-15
AI Technical Summary
The cost of existing AC soft starters remains high, mainly due to the high overall packaging cost caused by the riveting process of the thyristor chip.
The design of printed circuit board and metal heat conducting plate is adopted to directly mount the thyristor chip. The metal heat conducting plate covers the pad area of the copper substrate, and a conductive heat conducting trace area is configured on the insulating layer to increase the heat dissipation area while avoiding short circuits, eliminating the riveting and packaging processes.
The cost of the AC soft starter is reduced, while the heat dissipation performance and current flow are improved, sufficient heat dissipation capacity and current flow are ensured, and the complexity of the riveting process is avoided.
Smart Images
Figure CN223488117U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of electronic circuit heat dissipation design technology, specifically to an AC soft starter. Background Technology
[0002] AC soft starters are used to control electrical equipment during the motor starting process. Their core function is to achieve smooth starting by gradually increasing the motor input voltage.
[0003] An AC soft starter consists of a PCB board and a thyristor chip mounted on the PCB board. The thyristor chip is the most important heat-generating component in the AC soft starter and is usually equipped with a separate heat sink. In the current technology, a heat sink is usually riveted to the copper base of the thyristor chip, the thyristor chip is inserted into the PCB board, and then the components on the PCB board are packaged as a whole. However, the process of riveting the copper base makes the cost of the entire AC soft starter high. Summary of the Invention
[0004] To address the high cost of AC soft starters in existing technologies, this application proposes an AC soft starter that solves the aforementioned technical problem.
[0005] The technical solution adopted by this utility model to solve its technical problem is:
[0006] This utility model provides an AC soft starter, comprising: a printed circuit board (PCB) including a first surface and a second surface disposed opposite to each other; a silicon controlled rectifier (SCR) chip mounted on the first surface of the PCB, the SCR chip including a housing and pins extending from inside the housing to outside the housing and a copper substrate, the copper substrate being mounted on corresponding pads on the first surface of the PCB; and a metal heat-conducting plate including an insulating heat-conducting layer and a metal substrate layer, the insulating heat-conducting layer of the metal heat-conducting plate being mounted on the second surface of the PCB, and the metal heat-conducting plate at least covering the copper foil area on the second surface of the PCB for mounting the copper substrate.
[0007] Furthermore, a first trace area for conducting electricity and heat is disposed on the side of the insulating layer of the metal heat-conducting plate away from the metal substrate layer. The position of the first trace area on the insulating layer is opposite to the copper foil area of the pad for mounting the copper substrate on the second surface of the printed circuit board, and the area of the first trace area is equal to or slightly larger than the copper foil area of the pad for mounting the copper substrate on the second surface of the printed circuit board.
[0008] Furthermore, a second trace area for conducting electricity and heat is also disposed on the side of the insulating layer of the metal heat-conducting plate away from the metal substrate layer. The second trace area is isolated from the first trace area. The position of the second trace area on the insulating layer is opposite to the copper foil area on the second board surface of the printed circuit board for mounting the silicon controlled rectifier chip pins. The area of the second trace area is equal to or slightly larger than the copper foil area on the second board surface of the printed circuit board for mounting the silicon controlled rectifier chip pins.
[0009] Furthermore, the first trace area and the second trace area are formed at two corners of the insulating layer.
[0010] Furthermore, a third trace area is disposed on the side of the insulating layer of the metal heat-conducting plate away from the metal substrate layer. The third trace area is isolated from the first trace area and the second trace area, forming all remaining corners of the insulating layer not occupied by the first trace area and the second trace area.
[0011] Furthermore, the first trace area, the second trace area, and the third trace area are made of copper.
[0012] Furthermore, the pads on the printed circuit board used to mount the copper substrate of the thyristor chip are open-window pads with multiple through holes. The through holes penetrate the printed circuit board and have hollow copper tubes inside.
[0013] Furthermore, the material of the metal substrate layer is aluminum.
[0014] Furthermore, a heat sink is provided on the side of the housing of the silicon controlled rectifier chip away from the printed circuit board.
[0015] Based on the above technical solution, the technical effects that this utility model can achieve are as follows:
[0016] This utility model discloses an AC soft starter in which the thyristor chip is directly mounted on the printed circuit board, eliminating the need for overall encapsulation and thus saving costs. The metal heat-conducting plate is directly mounted on the second surface of the printed circuit board, and the metal heat-conducting plate at least covers the copper foil area on the second surface of the printed circuit board for mounting the copper substrate to ensure sufficient heat exchange area (the internal heat of the thyristor chip is mainly conducted out by the copper substrate). This eliminates the riveting process between the copper substrate of the thyristor chip and the heat sink, further saving costs and thus solving the technical problem of high cost of AC soft starters in the prior art.
[0017] This utility model discloses an AC soft starter. On the side of the insulating layer of a metal heat-conducting plate away from the metal substrate layer, a first conductive and heat-conducting trace area is configured. The position of this first trace area on the insulating layer corresponds to the copper foil area on the second surface of the printed circuit board (PCB) where the pads for mounting the copper substrate are located. The area of the first trace area is equal to or slightly larger than the area of the copper foil on the second PCB surface. The first trace area, made of a conductive and heat-conducting material, is directly mounted on the copper foil. Compared to mounting between the insulating layer and the copper foil, this method better dissipates heat. Furthermore, during the operation of the AC soft starter, current flows through the copper foil area of the copper substrate pads. The first trace area increases the cross-sectional area for current flow, resulting in better current conductivity. This reduces heat generation, and the dual effect enables the AC soft starter of this application to achieve better heat dissipation performance. The significance of the area of the first trace area being equal to or slightly larger than the copper foil area of the pads used for mounting the copper substrate on the second board surface of the printed circuit board is that although the larger the area of the first trace area, the better the electrical and thermal conductivity, an excessively large area will cause a short circuit between the thyristor chip pins and the copper substrate during the mounting process. Therefore, the most reasonable solution in practical applications is for the area of the first trace area to be equal to or slightly larger than the copper foil area of the pads used for mounting the copper substrate on the second board surface of the printed circuit board. In summary, the AC soft starter of this application, while ensuring sufficient heat dissipation capacity, eliminates the riveting and packaging processes in the prior art, greatly reducing costs.
[0018] The AC soft starter of this invention has a second trace area for conducting electricity and heat on the side of the insulating layer of the metal heat-conducting plate away from the metal substrate layer. The second trace area is isolated from the first trace area to prevent short circuits between the silicon controlled rectifier (SCR) chip pins and the copper substrate. The position of the second trace area on the insulating layer is opposite to the copper foil area on the second surface of the printed circuit board where the pads for mounting the SCR chip pins are located. The area of the second trace area is equal to or slightly larger than the copper foil area on the second surface of the printed circuit board where the pads for mounting the SCR chip pins are located. The second trace area can be used for heat dissipation at the pins of the SCR chip. At the same time, because the cross-sectional area of the current passage is increased, the current flow is better and the heat generation is reduced, thereby further improving the heat dissipation performance of the AC soft starter.
[0019] The AC soft starter of this utility model has a first wiring surface area and a second wiring surface area formed at two corners of the insulating layer. A third wiring surface area is also provided on the side of the insulating layer of the metal heat-conducting plate away from the metal substrate layer. The third wiring surface area is isolated from the first and second wiring surface areas and is formed in all remaining corners of the insulating layer that are not occupied by the first and second wiring surface areas. The third wiring surface area is used to increase the heat dissipation area and improve heat dissipation. At the same time, the first, second and third wiring surface areas are distributed in all corners of the metal heat-conducting plate, which can prevent the metal heat-conducting plate from lifting on the printed circuit board after mounting.
[0020] The AC soft starter of this invention has a heat sink on the side of the thyristor chip housing away from the printed circuit board. The heat sink can carry away the heat from the thyristor chip through the housing, further enhancing the heat dissipation performance. Attached Figure Description
[0021] Figure 1 This is a top view of the AC soft starter of this utility model;
[0022] Figure 2 This is a bottom view of the AC soft starter of this utility model;
[0023] Figure 3 This is a top view of the AC soft starter of this utility model after the silicon controlled rectifier chip is hidden;
[0024] Figure 4 This is a top view of the thyristor chip of the AC soft starter of this utility model;
[0025] Figure 5 This is a bottom view of the thyristor chip of the AC soft starter of this utility model;
[0026] Figure 6 This is a schematic diagram of the metal heat-conducting plate of the thyristor chip in the AC soft starter of this utility model.
[0027] Wherein: 1-Printed circuit board, 11-First board surface, 12-Second board surface, 13-Pad, 14-Through hole;
[0028] 2-SCR chip, 21-Casing, 22-Pin, 23-Copper substrate;
[0029] 3-Metal heat-conducting plate, 31-Insulating heat-conducting layer, 32-First wiring surface area, 33-Second wiring surface area, 34-Third wiring surface area. Detailed Implementation
[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.
[0031] like Figure 1-6 As shown, this utility model provides an AC soft starter, including a printed circuit board 1, a silicon controlled rectifier (SCR) chip 2, and a metal heat-conducting plate 3. The printed circuit board 1 includes a first plate surface 11 and a second plate surface 12 arranged opposite to each other. The SCR chip 2 is mounted on the first plate surface 11 of the printed circuit board 1. The SCR chip 2 includes a housing 21, pins 22 extending from inside the housing 21 to outside the housing 21, and a copper substrate 23. The heat inside the SCR chip 2 is mainly dissipated by the copper substrate 23. The copper substrate 23 is mounted on the corresponding pads 13 on the first plate surface 11 of the printed circuit board 1. The metal heat-conducting plate 3 includes an insulating heat-conducting layer 31 and a metal substrate layer. The insulating heat-conducting layer 31 of the metal heat-conducting plate 3 is mounted on the second plate surface 12 of the printed circuit board 1, and the metal heat-conducting plate 3 at least covers the copper foil area of the pads 13 for mounting the copper substrate 23 on the second plate surface 12 of the printed circuit board 1.
[0032] In a preferred embodiment of the present invention, a first trace area 32 for conducting electricity and heat is disposed on the side of the insulating layer of the metal heat-conducting plate 3 away from the metal substrate layer. The position of the first trace area 32 on the insulating layer is opposite to the copper foil area of the pad 13 for mounting the copper substrate 23 on the second board surface 12 of the printed circuit board 1, and the area of the first trace area 32 is equal to or slightly larger than the copper foil area of the pad 13 for mounting the copper substrate 23 on the second board surface 12 of the printed circuit board 1.
[0033] Furthermore, a second trace area 33 for conducting electricity and heat is also disposed on the side of the insulating layer of the metal heat-conducting plate 3 away from the metal substrate layer. The second trace area 33 is isolated from the first trace area 32. The position of the second trace area 33 on the insulating layer is opposite to the copper foil area of the pad 13 for mounting the pin 22 of the thyristor chip 2 on the second board surface 12 of the printed circuit board 1. The area of the second trace area 33 is equal to or slightly larger than the copper foil area of the pad 13 for mounting the pin 22 of the thyristor chip 2 on the second board surface 12 of the printed circuit board 1.
[0034] The first trace area 32 and the second trace area 33 are formed at two corners of the insulating layer to facilitate better mounting of the metal heat-conducting plate 3 onto the printed circuit board 1.
[0035] Furthermore, a third wiring surface area 34 is also disposed on the side of the insulating layer of the metal heat-conducting plate 3 away from the metal substrate layer. The third wiring surface area 34 is isolated from the first wiring surface area 32 and the second wiring surface area 33, forming all the remaining corners of the insulating layer that are not occupied by the first wiring surface area 32 and the second wiring surface area 33. The third wiring surface area 34 can be one or more, as long as it can cover all corners of the metal heat-conducting plate 3 to ensure that the mounting is flat and does not lift off.
[0036] In one specific embodiment of this utility model, the first trace area 32, the second trace area 33 and the third trace area 34 are made of copper.
[0037] One method of manufacturing the metal heat-conducting plate 3 of this utility model is as follows: a metal heat-conducting plate 3 having a wiring layer, an insulating heat-conducting layer 31 and a metal substrate layer stacked in sequence is selected, and then the portions of the wiring layer excluding the first wiring area 32, the second wiring area 33 and the third wiring area 34 are removed.
[0038] In one specific embodiment of this utility model, the pad 13 on the printed circuit board 1 for mounting the copper substrate 23 of the silicon controlled rectifier chip 2 is a windowed pad with multiple through holes 14. The through holes 14 penetrate the printed circuit board 1 and are provided with hollow copper tubes inside the holes, thereby ensuring that the heat inside the silicon controlled rectifier chip 2 can be better conducted to the second plate surface 12 of the printed circuit board 1 for heat exchange with the metal heat-conducting plate 3.
[0039] In one specific embodiment of this utility model, a heat sink is provided on the side of the housing 21 of the thyristor chip 2 away from the printed circuit board 1. The heat sink can carry away the heat on the thyristor chip 2 through the housing 21, thereby further enhancing the heat dissipation performance.
[0040] It should be understood that the specific embodiments described above are only for explaining the present invention and are not intended to limit the present invention. Obvious variations or modifications derived from the spirit of the present invention are still within the protection scope of the present invention.
Claims
1. An AC soft starter, characterized in that, include: Printed circuit board (1), the printed circuit board (1) includes a first board surface (11) and a second board surface (12) disposed opposite to each other; A thyristor chip (2) is mounted on the first surface (11) of the printed circuit board (1). The thyristor chip (2) includes a housing (21) and pins (22) extending from inside the housing (21) to outside the housing (21) and a copper substrate (23). The copper substrate (23) is mounted on the corresponding pads (13) of the first surface (11) of the printed circuit board (1). The metal heat-conducting plate (3) includes an insulating heat-conducting layer (31) and a metal substrate layer. The insulating heat-conducting layer (31) of the metal heat-conducting plate (3) is attached to the second surface (12) of the printed circuit board (1), and the metal heat-conducting plate (3) at least covers the copper foil area of the pad (13) for mounting the copper substrate (23) on the second surface (12) of the printed circuit board (1).
2. The AC soft starter according to claim 1, characterized in that, The insulating layer of the metal heat-conducting plate (3) is provided with a first trace area (32) for conducting electricity and heat on the side away from the metal substrate layer. The position of the first trace area (32) on the insulating layer is opposite to the copper foil area of the pad (13) for mounting the copper substrate (23) on the second board surface (12) of the printed circuit board (1). The area of the first trace area (32) is equal to or slightly larger than the copper foil area of the pad (13) for mounting the copper substrate (23) on the second board surface (12) of the printed circuit board (1).
3. The AC soft starter according to claim 2, characterized in that, The insulating layer of the metal heat-conducting plate (3) is further provided with a second trace area (33) for conducting electricity and heat on the side away from the metal substrate layer. The second trace area (33) is isolated from the first trace area (32). The position of the second trace area (33) on the insulating layer is opposite to the copper foil area of the pad (13) for mounting the pin (22) of the thyristor chip (2) on the second board surface (12) of the printed circuit board (1). The area of the second trace area (33) is equal to or slightly larger than the copper foil area of the pad (13) for mounting the pin (22) of the thyristor chip (2) on the second board surface (12) of the printed circuit board (1).
4. The AC soft starter according to claim 3, characterized in that, The first trace area (32) and the second trace area (33) are formed at two corners of the insulating layer.
5. The AC soft starter according to claim 4, characterized in that, A third trace area (34) is also disposed on the side of the insulating layer of the metal heat-conducting plate (3) away from the metal substrate layer. The third trace area (34) is isolated from the first trace area (32) and the second trace area (33), forming all remaining corners of the insulating layer that are not occupied by the first trace area (32) and the second trace area (33).
6. The AC soft starter according to claim 5, characterized in that, The first trace area (32), the second trace area (33) and the third trace area (34) are made of copper.
7. The AC soft starter according to claim 1, characterized in that, The pads (13) on the printed circuit board (1) for mounting the copper substrate (23) of the thyristor chip (2) are open-window pads with multiple through holes (14). The through holes (14) penetrate the printed circuit board (1) and are provided with hollow copper tubes inside the holes.
8. The AC soft starter according to claim 1, characterized in that, The material of the metal substrate layer is aluminum.
9. The AC soft starter according to claim 1, characterized in that, A heat sink is provided on the side of the housing (21) of the thyristor chip (2) away from the printed circuit board (1).