Protection assembly and frequency converter

Abstract

The utility model provides a protection assembly and a frequency converter, the frequency converter comprises the protection assembly, and the protection assembly comprises a plurality of power devices which are distributed side by side; the control panel is mounted on each power device and is used for controlling the on-off of the power devices; and the protective cover at least covers one side, deviating from the power device, of the control panel. Through the arrangement of the protective cover, the problem of insulation failure caused by the fact that the control panel is collided in the assembling and transporting process of the protective assembly can be prevented, meanwhile, due to the fact that the protective cover covers the control panel, electronic devices on the control panel can be further protected, and the protective effect of the protective assembly is enhanced.

Description

Technical Field

[0001] This application belongs to the field of frequency converter technology, and more specifically, relates to a protection component and a frequency converter. Background Technology

[0002] Inverters adjust the voltage and frequency of the output power supply by switching their internal insulated-gate bipolar transistors (IGBTs), providing the required power voltage according to the actual needs of the motor, thereby achieving energy saving and speed regulation. In recent years, with the increasing integration of the electronics industry, inverters are being used more and more in products across various industries as modular modules. As the core component of the inverter module, the protection of IGBT modules is particularly important. However, the drive board of IGBT modules is mainly protected by a conformal coating, which is easily damaged during transportation and assembly, offering insufficient protection. Utility Model Content

[0003] The purpose of this application is to provide a protection component and a frequency converter to solve the technical problem that the drive board of power devices cannot be effectively protected in the prior art.

[0004] To achieve the above objectives, the technical solution adopted in this application is: to provide a protective component, comprising:

[0005] Multiple power devices, each of which is arranged side by side;

[0006] A control board is mounted on each of the power devices and is used to control the on / off state of the power devices;

[0007] A protective cover is provided at least on the side of the control board away from the power device.

[0008] In some embodiments, the protective assembly further includes an input copper bus and an output copper bus, and the power device includes an input terminal and an output terminal disposed opposite to each other, the input terminal and the output terminal extending out of the protective cover to be connected to the input copper bus and the output copper bus, respectively.

[0009] In some embodiments, the input terminal includes a positive input terminal and a negative input terminal, and the outer peripheral wall of the protective cover extends outward with a plurality of isolation ribs, which are disposed between the positive input pin and the negative input pin.

[0010] In some embodiments, the protective assembly further includes an absorption capacitor connected to the input terminal, the absorption capacitor being disposed outside the protective cover, and the protective cover having a support surface for supporting the absorption capacitor.

[0011] In some embodiments, the support surface is provided with a raised rib, which is located between the positive terminal and the negative terminal of the absorption capacitor.

[0012] In some embodiments, the protective assembly further includes a heat dissipation substrate, on which each of the power devices is mounted.

[0013] In some embodiments, the protective cover extends to the heat dissipation substrate with support feet, which are locked and fixed to the heat dissipation substrate.

[0014] In some embodiments, the protective cover has heat dissipation windows distributed on its sidewalls.

[0015] In some embodiments, the top of the protective cover is provided with a connector corresponding to the communication terminal of the control board.

[0016] On the other hand, this application also provides a frequency converter including the aforementioned protection components.

[0017] The beneficial effects of the protective components and frequency converter provided in this application are as follows: by setting a protective cover, and the protective cover is at least placed on the side of the control board away from the power devices, the problem of insulation failure caused by the control board being bumped during the assembly and transportation of the protective components can be prevented. At the same time, since the protective cover is placed outside the control board, the electronic devices on the control board can be further protected, thereby enhancing the protective effect of the protective components. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A three-dimensional structural diagram of the protective component provided in an embodiment of this application;

[0020] Figure 2 for Figure 1 A magnified structural diagram of part A in the middle;

[0021] Figure 3 A top view of the protective component provided in an embodiment of this application;

[0022] Figure 4 for Figure 3 A magnified structural diagram of part B in the middle;

[0023] Figure 5 This is an exploded view of the protective component provided in an embodiment of this application;

[0024] Figure 6 A three-dimensional structural diagram of the protective cover in the protective assembly provided in the embodiments of this application;

[0025] Figure 7 A three-dimensional structural diagram of the power device in the protection assembly provided in the embodiments of this application;

[0026] Figure 8 This is a three-dimensional structural diagram of the input copper busbar in the protective component provided in the embodiment of this application.

[0027] The following are the labeling elements in the figure:

[0028] 100. Power device; 110. Input terminal; 111. Positive input terminal; 112. Negative input terminal; 120. Output terminal; 130. Positioning post; 140. Slot; 200. Control board; 210. Communication terminal; 300. Protective cover; 310. Top plate; 311. First board segment; 312. Second board segment; 3121. Support surface; 313. Connecting section; 314. Third board segment; 320. Side plate; 330. Support foot; 340. Isolation rib; 341. Isolation body; 34 2. Lower isolation section; 343. Upper isolation section; 350. Raised rib; 360. Heat dissipation window; 370. Plug interface; 400. Input copper busbar; 410. Positive input copper busbar; 411. First row body; 412. Positive input pin; 420. Negative input copper busbar; 421. Second row body; 422. Negative input pin; 500. Output copper busbar; 600. Absorption capacitor; 610. Capacitor positive pin; 620. Capacitor negative pin; 700. Heat dissipation substrate; X, first direction; Y, second direction. Detailed Implementation

[0029] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0030] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0031] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0033] Please see Figures 1 to 5 The protection component provided in the embodiments of this application will now be described. This protection component is used in a frequency converter and adjusts the voltage and frequency of the frequency converter's output power supply by controlling the switching of the power device 100. It provides the required power supply voltage according to the actual needs of the motor, thereby achieving the purpose of energy saving and speed regulation.

[0034] The protective assembly includes multiple power devices 100, a control board 200, and a protective cover 300; the power devices 100 are arranged side by side; the control board 200 is mounted on each power device 100 and is used to control the on / off state of the power devices 100; the protective cover 300 covers at least the side of the control board 200 away from the power devices 100.

[0035] Among them, the power device 100 can be an insulated gate bipolar transistor, and the number of power devices 100 is not limited and can be selected according to the power requirements and switching frequency requirements of the frequency converter.

[0036] The control board 200 is electrically connected to each power device 100, specifically to the PN junction of the power device 100. The control board 200 controls the on / off state of the power device 100, thereby adjusting the voltage and frequency of the inverter output power supply.

[0037] For ease of description, the side of the control board 200 facing the power device 100 is designated as the back side, and the side of the control board 200 away from the power device 100 is designated as the front side. The protective cover 300 covering at least the side of the control board 200 away from the power device 100 means that the protective cover 300 can cover only the front side of the control board 200 to protect the front of the control board 200 and the electronic devices on it; or, the protective cover 300 can cover both the front and the periphery of the control board 200 to provide full protection for the control board 200.

[0038] The protective component in this embodiment, by providing a protective cover 300, and the protective cover 300 covering at least the side of the control board 200 away from the power device 100, can prevent the control board 200 from being bumped and causing insulation failure during the assembly and transportation of the protective component. At the same time, since the protective cover 300 covers the control board 200, it can further protect the electronic devices on the control board 200, thereby enhancing the protective effect of the protective component.

[0039] In some embodiments, please refer to Figure 1 and Figure 2 The protective assembly also includes an input copper busbar 400 and an output copper busbar 500. The power device 100 includes an input terminal 110 and an output terminal 120 disposed opposite to each other. The input terminal 110 and the output terminal 120 extend outside the protective cover 300 to connect to the input copper busbar 400 and the output copper busbar 500, respectively. By extending the input terminal 110 and the output terminal 120 of the power device 100 outside the protective cover 300, it is easier to connect the input copper busbar 400 and the output copper busbar 500 to the input terminal 110 and the output terminal 120, respectively. This also reduces the size and cost of the protective cover 300. It is understood that in other embodiments of this application, with a reasonable structural design, the input terminal 110 and the output terminal 120 of the power device 100 can also be located inside the protective cover 300, and the pins of the input copper busbar 400 and the output copper busbar 500 can be inserted into the protective cover 300 to connect to the input terminal 110 and the output terminal 120, respectively.

[0040] For details, please refer to Figure 5 and Figure 7 The power devices 100 are arranged side-by-side along the first direction X. The input terminal 110 and output terminal 120 of each power device 100 are located at opposite ends of the power device 100 along the second direction Y. The input copper busbar 400 and output copper busbar 500 are respectively located at opposite ends of each power device 100 along the second direction Y. The first direction X is perpendicular to the second direction Y. The above arrangement makes the overall structure of the power devices 100 neat and compact.

[0041] In some embodiments, please refer to Figure 2 , Figure 7 and Figure 8The input terminal 110 includes a positive input terminal 111 and a negative input terminal 112. The input copper busbar 400 includes a positive input pin 412 and a negative input pin 422 connected to the positive input terminal 111 and the negative input terminal 112, respectively. Multiple insulating ribs 340 extend outward from the outer peripheral wall of the protective cover 300. The insulating ribs 340 are located between the positive input pin 412 and the negative input pin 422, and also between the positive input terminal 111 and the negative input terminal 112. This configuration only requires extending multiple insulating ribs 340 from the outer peripheral wall of the protective cover 300 to achieve positive and negative insulation isolation of the power device 100's input terminals. It eliminates the need for insulating paper to achieve the same isolation, reducing the material cost of insulating paper and the additional assembly process. This strengthens insulation while simplifying the assembly process of the entire protective assembly.

[0042] Optionally, the isolation rib 340 is integrally formed into the protective cover 300, that is, the isolation rib 340 is part of the protective cover 300, which simplifies the manufacturing process of the protective cover 300. Understandably, in other embodiments, the isolation rib 340 can also be fixed to the outer peripheral wall of the protective cover 300 by means of bonding, welding or screw locking.

[0043] Optionally, the size of the isolation rib 340 can be set according to the connection of the positive input pin 412 and the positive input terminal 111 to ensure that the isolation rib 340 can completely cover the connection position of the two.

[0044] For details, please refer to Figure 2 , Figure 6 and Figure 7 The power device 100 has a slot 140 between the positive input terminal 111 and the negative input terminal 112. The isolation rib 340 includes an isolation body 341 formed on the peripheral sidewall of the protective cover 300, a lower isolation section 342 extending downward from the isolation body 341, and an upper isolation section 343 extending upward from the isolation body 341. The lower isolation section 342 is inserted into the slot 140, and the upper isolation section 343 is inserted between the positive input pin 412 and the negative input pin 422. This arrangement can achieve complete isolation between the positive input terminal 111 and the negative input terminal 112, and also position the isolation rib 340.

[0045] In some embodiments, please refer to Figure 8The input copper busbar 400 includes a positive input copper busbar 410 and a negative input copper busbar 420. The positive input copper busbar 410 includes a first row body 411 and a plurality of positive input pins 412 distributed on the first row body 411. The negative input copper busbar 420 includes a second row body 421 and a plurality of negative input pins 422 distributed on the second row body 421. The first row body 411 is located below the second row body 421 and is spaced apart. The positive input pins 412 and the negative input pins 422 are arranged alternately in sequence.

[0046] In some embodiments, please refer to the following: Figure 1 , Figure 2 , Figure 5 and Figure 6 The protective assembly also includes an absorption capacitor 600 connected to the input terminal 110. The absorption capacitor 600 is disposed outside the protective cover 300, and the protective cover 300 has a support surface 3121 for supporting the absorption capacitor 600. This arrangement allows the absorption capacitor 600 to be stably supported, preventing it from relying on its pins and electronic components on the control board 200 for support, which could lead to deformation of the absorption capacitor 600 and easy heat transfer to other electronic components.

[0047] In some embodiments, please refer to Figure 1 and Figure 6 The protective cover 300 includes a top plate 310 and a side plate 320. The side plate 320 and the bottom periphery of the top plate 310 are connected. The top plate 310 and the side plate 320 enclose a receiving cavity. The top plate 310 and the side plate 320 surround a control board 200, and the electronic components on the control board 200 are housed in the receiving cavity. The top plate 310 includes a first plate segment 311, a second plate segment 312, and a connecting segment 313. The first plate segment 311 and the second plate segment 312 are arranged parallel to each other. The first plate segment 311 is higher than the second plate segment 312. The connecting segment 313 extends vertically downward from the right edge of the first plate segment 311 to the second plate segment 312, and the connecting segment 313 is perpendicularly connected to the second plate segment 312. Each absorption capacitor 600 is supported on the second plate segment 312, and a support surface 3121 is formed on the second plate segment 312. By setting the top plate 310 with the first plate segment 311 and the second plate segment 312 of different heights, the shorter electronic components on the control board 200 are positioned to correspond to the positions of the absorption capacitor 600. This not only makes the overall space occupied by the absorption capacitor 600 and the protective cover 300 small, but also supports the absorption capacitor 600 and ensures the installation stability of the absorption capacitor 600.

[0048] In some embodiments, please refer to Figure 4 and Figure 6The absorption capacitor 600 has a positive terminal lead 610 and a negative terminal lead 620. A raised rib 350 is provided on the support surface 3121 between the positive terminal lead 610 and the negative terminal lead 620. The raised rib 350 completely isolates the positive terminal lead 610 and the negative terminal lead 620, ensuring their insulation. Furthermore, it eliminates the need for adhesive application between the positive and negative terminals, simplifying the assembly process of the protective component.

[0049] Optionally, the rib 350 is integrally formed into the protective cover 300, that is, the rib 350 is a component of the protective cover 300, and the protective cover 300 can be manufactured as a single piece. It is understood that in other embodiments, the rib 350 can also be installed on the protective cover 300 by means of bonding, welding or screw fastening.

[0050] The rib 350 only needs to be formed on the support surface 3121 corresponding to the positive terminal 610 and the negative terminal 620 of the capacitor, without completely covering the entire absorption capacitor 600. This design ensures that the positive terminal 610 and the negative terminal 620 are isolated and insulated, while also preventing the absorption capacitor 600 from becoming unstable due to being supported by the rib 350. Furthermore, the height of the rib 350 only needs to cover the thickness of the positive terminal 610 and the negative terminal 620, plus some margin, to avoid the absorption capacitor 600 becoming unstable due to excessive height.

[0051] In some embodiments, please refer to Figure 6 The raised rib 350 and the isolation rib 340 are formed on adjacent sides of the protective cover 300, and the raised rib 350 and the isolation rib 340 are connected. This isolates the positive terminal 610 and the negative terminal 620 of the capacitor from the absorption capacitor 600 to the input terminal 110, ensuring the insulation between the positive and negative terminals of the absorption capacitor 600. At the same time, the connected design also enhances the structural strength of the raised rib 350 and the isolation rib 340, ensuring their respective isolation effects.

[0052] In some embodiments, please refer to Figure 2 The positive input terminal 111, positive input pin 412, and capacitor positive pin 610 are stacked sequentially and tightened with screws to form an electrical connection between the positive input terminal 111, positive input pin 412, and capacitor positive pin 610. Similarly, the negative input terminal 112, negative input pin 422, and capacitor negative pin 620 are stacked sequentially and tightened with screws to form an electrical connection between the negative input terminal 112, negative input pin 422, and capacitor negative pin 620.

[0053] In some embodiments, please refer to Figure 7 The power device 100 is provided with a positioning post 130, and the control board 200 is provided with a positioning hole. The positioning post 130 and the positioning hole form the positioning of the power device 100 and the control board 200. In addition, the control board 200 is soldered to the power device 100 to form an electrical connection between the two.

[0054] In some embodiments, please refer to Figure 1 and Figure 5 The protective assembly also includes a heat dissipation substrate 700, on which each power device 100 is mounted. This arrangement allows the heat generated by each power device 100 to be dissipated through the heat dissipation substrate 700, enabling each power device 100 to operate in a relatively stable temperature environment and improving its lifespan.

[0055] Optionally, each power device 100 is fixed to the heat sink substrate 700 by screws.

[0056] In some embodiments, please refer to Figure 1 , Figure 3 and Figure 5 The protective cover 300 extends towards the heat dissipation substrate 700 with a support foot 330, which is locked and fixed to the heat dissipation substrate 700. The support foot 330 is provided to both install the protective cover 300 and support the protective cover 300 at a certain height, so as to avoid structural interference between the protective cover 300 and the input copper bus 400, the output copper bus 500 and the absorption capacitor 600.

[0057] Optionally, the protective cover 300 includes four support feet 330, two of which are respectively located on opposite sides of the protective cover 300 along the first direction X, and the other two support feet 330 are located on one side of the protective cover 300 corresponding to the input copper busbar 400. These two support feet 330 are offset from the output terminals 120 of each power device 100. This arrangement ensures the support stability of the protective cover 300 while offsetting the support feet 330 from the external structure of the protective cover 300. It is understood that in other embodiments of this application, the number of support feet 330 may be only two along the first direction X, or it may be three, five, or more than five. The distribution of each support foot 330 only needs to satisfy the requirement of support stability while being offset from other external structures.

[0058] Optionally, each support foot 330 is fixed to the heat dissipation base plate 700 by screws. Each support foot 330 is formed on the side plate 320 of the protective cover 300 and extends from the top side of the side plate 320 to the heat dissipation base plate 700.

[0059] In some embodiments, please refer to Figure 1 and Figure 6 The protective cover 300 has heat dissipation windows 360 distributed on its side walls. The heat dissipation windows 360 enable airflow between the inside and outside of the protective cover 300, thereby quickly removing heat from the inside of the protective cover 300. This allows the control board 200 to operate in a more optimal temperature environment and improves the service life of the control board 200.

[0060] Optionally, the heat dissipation windows 360 are mainly distributed on opposite sides of the protective cover 300 along the first direction X, so as to be staggered from the input copper busbar 400 and the output copper busbar 500; of course, some heat dissipation windows 360 can also be appropriately opened on opposite sides of the protective cover 300 along the second direction Y, for example, heat dissipation windows 360 can be set on the connection section 313. In addition, the size and number of heat dissipation windows 360 can be set according to the actual heat dissipation requirements.

[0061] Alternatively, the protective cover 300 can be made of a thermally conductive material. This allows the heat from the protective cover 300 to be quickly conducted to the heat dissipation substrate 700 and dissipated from the heat dissipation substrate 700.

[0062] Alternatively, the protective cover 300 may also be made of heat-dissipating material, so that the heat transferred from the control board 200 to the protective cover 300 can be quickly dissipated through the protective cover 300.

[0063] Optionally, the support feet 330 are positioned to avoid the heat dissipation window 360. For example, along the opposite sides of the first direction X, the two support feet 330 are respectively positioned close to the input copper busbar 400 to facilitate the centralized placement of the heat dissipation window 360.

[0064] In some embodiments, please refer to Figure 1 , Figure 3 and Figure 6 The protective cover 300 is provided with a plug interface 370 corresponding to the communication terminal 210 of the control board 200. External cables can be connected to the communication terminal 210 through the plug interface 370, thereby forming a connection between the control board 200 and the external circuit.

[0065] Specifically, the connector 370 is located on the top plate 310 of the protective cover 300, which facilitates wiring and maintenance.

[0066] Specifically, the top plate 310 also includes a third plate segment 314, which is lower than the second plate segment 312. The third plate segment 314 surrounds the second plate segment 312 on one side away from the first plate segment 311 and on one side along the first direction X. The plug-in interface 370 is formed in the third plate segment 314. The above arrangement allows the height of the plug-in interface 370 to be adapted to the height of the communication terminal 210, facilitating the connection of external cables to the communication terminal 210.

[0067] On the other hand, this application also provides a frequency converter including the aforementioned protective components. The frequency converter of this application, through the provision of the aforementioned protective components, achieves better protection.

[0068] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A protective component, characterized in that, include: Multiple power devices, each of which is arranged side by side; A control board is mounted on each of the power devices and is used to control the on / off state of the power devices; A protective cover is provided at least on the side of the control board away from the power device.

2. The protective component as described in claim 1, characterized in that, The protective assembly further includes an input copper busbar and an output copper busbar. The power device includes an input terminal and an output terminal arranged opposite to each other. The input terminal and the output terminal extend outside the protective cover to be connected to the input copper busbar and the output copper busbar, respectively.

3. The protective component as described in claim 2, characterized in that, The input terminal includes a positive input terminal and a negative input terminal. The outer peripheral wall of the protective cover extends outward with a plurality of isolation ribs, which are located between the positive input terminal and the negative input terminal.

4. The protective component as described in claim 2, characterized in that, The protective assembly also includes an absorption capacitor connected to the input terminal. The absorption capacitor is located outside the protective cover, and the protective cover has a support surface for supporting the absorption capacitor.

5. The protective component as described in claim 4, characterized in that, The support surface is provided with a raised rib, which is located between the positive terminal and the negative terminal of the absorption capacitor.

6. The protective component as described in any one of claims 1 to 5, characterized in that, The protective assembly also includes a heat dissipation substrate, on which each of the power devices is mounted.

7. The protective component as claimed in claim 6, characterized in that, The protective cover extends towards the heat dissipation substrate with supporting feet, which are locked and fixed to the heat dissipation substrate.

8. The protective component as described in any one of claims 1 to 5, characterized in that, The protective cover has heat dissipation windows distributed on its side walls.

9. The protective component as described in any one of claims 1 to 5, characterized in that, The top of the protective cover is provided with a connector corresponding to the communication terminal of the control board.

10. A frequency converter, characterized in that, Includes the protective components as described in any one of claims 1 to 9.

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