Frequency converter

Abstract

The utility model relates to the technical field of control components, in particular to a frequency converter which comprises a first circuit board, a second circuit board and a third circuit board, the first circuit board and the second circuit board are both located on the same side of the third circuit board, and the first circuit board and the second circuit board are arranged in parallel at intervals in the height direction of the frequency converter. The first circuit board is located below the second circuit board, and a capacitor is arranged on the first circuit board; the surface of the third circuit board is parallel to the height direction of the frequency converter, a transformer is arranged on the side, facing the first circuit board, of the third circuit board, and the upper surface of the second circuit board, the upper surface of the third circuit board and the upper surface of the transformer are not higher than the upper surface of the capacitor in the height direction of the frequency converter. Therefore, the size of the frequency converter in the height direction can be reduced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of control components, and in particular to a frequency converter. Background Art

[0002] The application field of frequency converter is relatively wide. Its working principle is to control the power control device of AC motor by changing the working power frequency of the motor. If the size of the frequency converter is large, its application scenario will be limited. For example, when the frequency converter is applied to vacuum pumps used in industries such as semiconductors, since the industry requires the design of the vacuum pump to be compact, the installation space of the frequency converter is limited and the existing frequency converter cannot meet the installation requirements.

[0003] In the related art, in order to reduce the length and width dimensions of the inverter, the circuit board is usually divided into multiple pieces and arranged at intervals along the height direction of the inverter. For relatively large components such as capacitors and transformers, sufficient space in the height direction needs to be reserved when arranging them. Therefore, this will cause the size of the product to increase significantly at least in the height direction. Utility Model Content

[0004] An object of the present disclosure is to provide a frequency converter to reduce the size of the frequency converter at least in the height direction.

[0005] Based on the above purpose, the present disclosure provides a first circuit board, a second circuit board and a third circuit board, wherein the first circuit board and the second circuit board are both located on the same side of the third circuit board, the first circuit board and the second circuit board are arranged in parallel and spaced apart along the height direction of the inverter, the first circuit board is located below the second circuit board, and a capacitor is arranged on the first circuit board;

[0006] The surface of the third circuit board is parallel to the height direction of the inverter. A transformer is provided on the side of the third circuit board facing the first circuit board. Along the height direction of the inverter, the upper surface of the second circuit board, the upper surface of the third circuit board and the upper surface of the transformer are not higher than the upper surface of the capacitor.

[0007] In one embodiment of the present disclosure, the second circuit board is provided with a first avoidance gap and a second avoidance gap, and along the length direction and the width direction of the inverter, at least a portion of the capacitor is located in the first avoidance gap, and at least a portion of the transformer is located in the second avoidance gap.

[0008] In one embodiment of the present disclosure, along the length direction of the inverter, the capacitor is located in the first avoidance gap, and the transformer is located in the second avoidance gap.

[0009] In one embodiment of the present disclosure, along the height direction of the inverter, the upper surface of the third circuit board is flush with the upper surface of the capacitor.

[0010] In one embodiment of the present disclosure, the inverter further includes a heat dissipation structure having a receiving space, and the first circuit board, the second circuit board and the third circuit board are all installed in the receiving space.

[0011] In one embodiment of the present disclosure, the heat dissipation structure includes a base plate, a first side plate and a second side plate, the first side plate and the second side plate are arranged at two ends of the base plate opposite to each other, and the base plate is used to adhere to and fixedly connect with an external cold plate.

[0012] In one embodiment of the present disclosure, a guide groove is provided on a side of the base plate facing away from the first circuit board, and the guide groove is used to accommodate at least a portion of a fastener so that the fastener can move along an extension direction of the guide groove to a position corresponding to a mounting hole of an external cold plate.

[0013] In one embodiment of the present disclosure, a boss is formed on one side of the bottom plate close to the first circuit board, and the guide groove passes through the bottom plate and is formed in the boss.

[0014] In one embodiment of the present disclosure, the number of the bosses is two, the two bosses are arranged in parallel and spaced apart along the length direction of the inverter, and the first circuit board is located on the upper surface of the bosses.

[0015] In one embodiment of the present disclosure, the guide groove includes at least two groove portions with different widths, and the widths of at least two of the groove portions increase sequentially along the direction from the groove opening to the groove bottom of the guide groove.

[0016] In one embodiment of the present disclosure, a stop portion is provided at the notch of the guide slot, and the stop portion is used to limit at least a portion of the fastener within the guide slot.

[0017] In one embodiment of the present disclosure, the upper surface of the bottom plate is provided with a convex rib, the convex rib is used to provide a threaded hole, and the threaded hole passes through the bottom plate;

[0018] Along the height direction of the inverter, a gap is provided between the lower surface of the first circuit board and the upper surface of the convex rib.

[0019] In one embodiment of the present disclosure, the convex rib is in a strip plate-like structure, and an extending direction of the convex rib is consistent with a width direction of the inverter.

[0020] In one embodiment of the present disclosure, the heat dissipation structure further includes a third side plate and a fourth side plate, the third side plate is connected to one end of the first side plate and the second side plate, and the fourth side plate is connected to the other end of the first side plate and the second side plate.

[0021] In one embodiment of the present disclosure, the heat dissipation structure is an integrated structure.

[0022] In one embodiment of the present disclosure, the frequency converter further includes a plurality of terminals, and the plurality of terminals are arranged on the same side of the frequency converter.

[0023] The beneficial effects of the present disclosure are mainly:

[0024] The inverter provided by the present disclosure is beneficial to reducing the dimensions of the inverter in the length direction and the width direction because the first circuit board and the second circuit board are arranged in parallel and spaced apart along the height direction of the inverter. At the same time, the first circuit board and the second circuit board are both located on the same side of the third circuit board, the board surface of the third circuit board is parallel to the height direction of the inverter, and the upper surface of the third circuit board is not higher than the upper surface of the capacitor, which is equivalent to making full use of the space in the height direction of the inverter to arrange the third circuit board, avoiding the problem of the inverter height being too high due to the stacking of the third circuit board with the first circuit board and the second circuit board along the height direction of the inverter; the relatively large transformer is arranged on the side of the third circuit board facing the first circuit board, and it is ensured that the upper surface of the transformer is not higher than the upper surface of the capacitor, which can make full use of the space between the first circuit board and the second circuit board, and will not exceed the dimension of the capacitor in the height direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the specific embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 A schematic diagram of the structure of a frequency converter provided in an embodiment of the present disclosure;

[0027] Figure 2 A schematic diagram of the structure of a frequency converter provided in an embodiment of the present disclosure (the cover is not shown);

[0028] Figure 3 for Figure 2 A rear view of the frequency converter is shown;

[0029] Figure 4 for Figure 3 A partial enlarged view of the middle A;

[0030] Figure 5 A front view of a frequency converter provided by an embodiment of the present disclosure;

[0031] Figure 6 A schematic structural diagram of a frequency converter provided by an embodiment of the present disclosure from another perspective;

[0032] Figure 7 A schematic diagram of the heat dissipation structure in the frequency converter provided by an embodiment of the present disclosure;

[0033] Figure 8 A schematic diagram of the inverter provided in an embodiment of the present disclosure cooperating with an external cold plate.

[0034] The following are the descriptions of the reference numerals:

[0035] 1- first circuit board;

[0036] 2- second circuit board;

[0037] 21 - first edge;

[0038] 22 - second edge;

[0039] 23-third edge;

[0040] 24-Fourth edge;

[0041] 3- the third circuit board;

[0042] 4-Capacitor;

[0043] 5- Transformer;

[0044] 6- Heat dissipation structure;

[0045] 61- bottom plate;

[0046] 61a- boss;

[0047] 611-guide groove;

[0048] 6111-first groove;

[0049] 6112-second groove portion;

[0050] 612-stop part;

[0051] 613-convex rib;

[0052] 614-fixing hole;

[0053] 62- first side plate;

[0054] 63- second side plate;

[0055] 71- ground terminal;

[0056] 72-input and output terminals;

[0057] 73-control terminal;

[0058] 74-relay terminal;

[0059] 8-cover body;

[0060] 9- External cold plate. DETAILED DESCRIPTION

[0061] The technical solution of the present disclosure will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present disclosure.

[0062] In the description of the present disclosure, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present disclosure and simplifying the description, and does 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 of the present disclosure. In addition, if the terms "first", "second", "third" appear, they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0063] In the description of the present disclosure, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0064] See also Figures 1 to 8 As shown, Figure 1The arrow direction D1 in the figure indicates the length direction of the frequency converter, the arrow direction D2 indicates the width direction of the frequency converter, and the arrow direction D3 indicates the height direction of the frequency converter. The length direction, width direction, and height direction of the frequency converter are perpendicular to each other. This embodiment provides a frequency converter, including a first circuit board 1, a second circuit board 2, and a third circuit board 3. The first circuit board 1 and the second circuit board 2 are both located on the same side of the third circuit board 3. The first circuit board 1 and the second circuit board 2 are arranged in parallel and spaced apart along the height direction of the frequency converter. The first circuit board 1 is located below the second circuit board 2. A capacitor 4 is arranged on the first circuit board 1. The board surface of the third circuit board 3 is parallel to the height direction of the frequency converter. A transformer 5 is arranged on the side of the third circuit board 3 facing the first circuit board 1. Along the height direction of the frequency converter, the upper surface of the second circuit board 2, the upper surface of the third circuit board 3, and the upper surface of the transformer 5 are not higher than the upper surface of the capacitor 4.

[0065] The frequency converter provided in this embodiment is advantageous in reducing the length and width dimensions of the frequency converter compared to a whole circuit board, as the first circuit board 1 and the second circuit board 2 are arranged in parallel and spaced apart along the height direction of the frequency converter. Meanwhile, the first circuit board 1 and the second circuit board 2 are both located on the same side of the third circuit board 3, the surface of the third circuit board 3 is parallel to the height direction of the frequency converter, and the upper surface of the third circuit board 3 is not higher than the upper surface of the capacitor 4, which is equivalent to making full use of the space in the height direction of the frequency converter to arrange the third circuit board 3, and avoiding the frequency converter being too high due to the stacking of the third circuit board 3 with the first circuit board 1 and the second circuit board 2 along the height direction of the frequency converter; the relatively large transformer 5 is arranged on the side of the third circuit board 3 facing the first circuit board 1, and it is ensured that the upper surface of the transformer 5 is not higher than the upper surface of the capacitor 4, so that the space between the first circuit board 1 and the second circuit board 2 can be fully utilized, and the dimension of the capacitor 4 in the height direction will not be exceeded.

[0066] In one embodiment, see Figure 2 As shown, the second circuit board 2 is provided with a first avoidance gap and a second avoidance gap. Along the length direction and width direction of the inverter, at least part of the capacitor 4 is located in the first avoidance gap, and at least part of the transformer 5 is located in the second avoidance gap.

[0067] Exemplarily, the shape of the second circuit board 2 can be rectangular, and the second circuit board 2 has two opposite long sides and two opposite short sides, the long sides are parallel to the length direction of the inverter, and the short sides are parallel to the width direction of the inverter, and the length of the long sides is not necessarily greater than the length of the short sides. The board surface of the third circuit board 3 is parallel to the long sides of the second circuit board 2, and the first avoidance gap and the second avoidance gap are both arranged on the long sides of the second circuit board 2 close to the third circuit board 3. The edges of the first avoidance gap are L-shaped, and the edges of the first avoidance gap include a first edge 21 and a second edge 22, the first edge 21 is parallel to the width direction of the inverter, and the second edge 22 is perpendicular to the first edge 21; the cross-section of the capacitor 4 is generally circular, and when the length of the second edge 22 is less than the diameter of the capacitor 4, along the length direction of the inverter, a part of the capacitor 4 is located in the first avoidance gap, and when the length of the second edge 22 is greater than or equal to the diameter of the capacitor 4, along the length direction of the inverter, the capacitor 4 is completely located in the first avoidance gap.

[0068] For example, see Figure 2 As shown, there are two capacitors 4, and the two capacitors 4 are arranged along the width direction of the inverter. When the length of the first edge 21 is less than the sum of the diameters of the two capacitors 4, along the width direction of the inverter, the capacitor 4 close to the second edge 22 is located in the first avoidance gap, a part of the other capacitor 4 is located in the first avoidance gap, and the other part is located outside the first avoidance gap.

[0069] It should be noted that the number and arrangement of capacitors 4 are not limited to the above one, and other numbers can be selected and arranged according to actual product requirements, as long as the overall size of the inverter can be reduced to meet the corresponding installation requirements.

[0070] In this embodiment, see Figure 1 and Figure 2 As shown, the frequency converter includes a relay terminal 74 , which is disposed on the second circuit board 2 , and is located between the second edge 22 and a long side of the second circuit board 2 away from the capacitor 4 .

[0071] It should be noted that when the inverter is not provided with the relay terminal 74, the first avoidance gap can be set larger, that is, the first edge 21 can be set longer, so that the other capacitor 4 can be as much as possible or even completely located in the first avoidance gap.

[0072] When the upper surface of the transformer 5 exceeds the second circuit board 2, in order to prevent the transformer 5 from interfering with the second circuit board 2, a second avoidance gap can be set on the second circuit board 2. Exemplarily, the edges of the second avoidance gap are L-shaped, and the edges of the second avoidance gap include a third edge 23 and a fourth edge 24. The third edge 23 is parallel to the width direction of the inverter, and the fourth edge 24 is perpendicular to the third edge 23.

[0073] Exemplarily, along the length direction of the frequency converter, the length of the fourth edge 24 is equal to the length of the transformer 5 , so that the side wall of the transformer 5 away from the third edge 23 will not exceed the second avoidance gap.

[0074] It should be understood that the provision of the first avoidance gap and the second avoidance gap will reduce the arrangement space of components on the second circuit board 2. Therefore, during production design, factors such as the arrangement of components and the external dimensions of the inverter should be comprehensively considered as much as possible.

[0075] Of course, if the upper surface of the transformer 5 does not interfere with the components on the second circuit board 2, the distance between the third circuit board 3 and the second circuit board 2 can be shortened so that the transformer 5 is located between the first circuit board 1 and the second circuit board 2 as much as possible, further reducing the width dimension of the inverter.

[0076] In one embodiment, along the length direction of the frequency converter, the capacitor 4 is located in the first avoidance gap, and the transformer 5 is located in the second avoidance gap. This can minimize the length direction size of the frequency converter while ensuring the reasonable arrangement of all components.

[0077] In one embodiment, see Figure 3 As shown, along the height direction of the frequency converter, the upper surface of the third circuit board 3 is substantially flush with the upper surface of the capacitor 4. In this way, the area of ​​the third circuit board 3 can be increased as much as possible without affecting the minimization of the overall height of the frequency converter, so that more components can be arranged on the third circuit board 3. When the number of components is the same, fewer components can be arranged on the first circuit board 1 and the second circuit board 2, thereby further reducing the length and width dimensions of the first circuit board 1 and the second circuit board 2, thereby reducing the length and width dimensions of the frequency converter.

[0078] It should be understood that, under the premise of not interfering with the capacitor 4 or other structures, the length of the third circuit board 3 can be extended as much as possible to further increase the area of ​​the third circuit board 3 .

[0079] It should be understood that when performing the spatial layout of the circuit board, it is necessary to comprehensively consider the layout of all components and make full use of the first circuit board 1, the second circuit board 2 and the third circuit board 3 to comprehensively design the dimensions of the inverter in terms of length, width and height according to different installation space sizes.

[0080] In one embodiment, see Figure 2 and Figure 7 As shown, the frequency converter further includes a heat dissipation structure 6, which has a receiving space, and the first circuit board 1, the second circuit board 2 and the third circuit board 3 are all installed in the receiving space.

[0081] By providing the heat dissipation structure 6, not only can the components and other structures inside the inverter be cooled and dissipated, but also because the heat dissipation structure 6 has a storage space, it can be used as a base for installing the first circuit board 1, the second circuit board 2 and the third circuit board 3.

[0082] In this embodiment, the heat dissipation structure 6 is an integrally formed structure, for example, it can be integrally formed by an aluminum extrusion process or a die-casting process.

[0083] In one embodiment, see Figure 1 , Figure 2 , Figure 7 and Figure 8 As shown, the heat dissipation structure 6 includes a bottom plate 61, a first side plate 62 and a second side plate 63. The first side plate 62 and the second side plate 63 are arranged on both sides of the bottom plate 61 opposite to each other. The bottom plate 61 is used to be attached to and fixedly connected with the external cold plate 9.

[0084] Exemplarily, the bottom plate 61, the first side plate 62 and the second side plate 63 can be integrally formed by aluminum extrusion, which can reduce the production cost of the heat dissipation structure 6. In other embodiments, the bottom plate 61, the first side plate 62 and the second side plate 63 can also be welded.

[0085] The first side plate 62 and the second side plate 63 are disposed opposite to each other at two ends of the bottom plate 61 , so that the first side plate 62 , the bottom plate 61 and the second side plate 63 form a U-shaped plate structure, and the inner space of the U-shaped structure is a receiving space.

[0086] See also Figure 1 As shown, the inverter further includes a cover 8, which is also generally a U-shaped plate structure. The cover 8 and the heat dissipation structure 6 are buckled together to form a closed space, and the first circuit board 1, the second circuit board 2 and the third circuit board 3 are all located in the closed space. The cover 8 is provided with holes for the terminals to pass through.

[0087] In this embodiment, the frequency converter further includes a plurality of terminals, and the plurality of terminals are arranged on the same side of the frequency converter. Figure 1 and Figure 5As shown, the inverter includes a grounding terminal 71, an input-output terminal 72, a control terminal 73 and a relay terminal 74. A side wall of the cover body 8 is provided with holes for the grounding terminal 71, the input-output terminal 72, the control terminal 73 and the relay terminal 74 to pass through. After assembly, the grounding terminal 71, the input-output terminal 72, the control terminal 73 and the relay terminal 74 are all located on the same side wall of the cover body 8, which can serve as the front side wall of the inverter.

[0088] In this embodiment, the first side plate 62 and the second side plate 63 can contact the circuit board to increase the heat dissipation area and enhance the heat dissipation effect.

[0089] In this embodiment, the lower surface of the bottom plate 61 is a plane, eliminating the existing heat sink fins, thereby saving the material of the radiator and reducing the cost. When the inverter is applied to a vacuum pump, the external cold plate 9 can be a liquid cooling plate of the vacuum pump, and the bottom plate 61 can be fixedly installed on the liquid cooling plate of the vacuum pump, and the lower surface of the bottom plate 61 can fit the liquid cooling plate.

[0090] In one embodiment, see Figure 6 and Figure 7 As shown, the base plate 61 is provided with a plurality of fixing holes 614. Exemplarily, the number of the fixing holes 614 is three. Normally, the fixing holes 614 can be aligned with the mounting holes of the external cold plate 9, and the base plate 61 can be fixedly mounted on the external cold plate 9 by fasteners such as bolts and nuts.

[0091] In one embodiment, a guide groove 611 is provided on one side of the base plate 61 away from the first circuit board 1 , and the guide groove 611 is used to accommodate at least part of the fastener so that the fastener can move along the extension direction of the guide groove 611 to a position corresponding to the mounting hole of the external cold plate 9 .

[0092] In certain specific installation environments, such as when the installation space is limited, the fixing hole 614 may not correspond to the mounting hole of the external cold plate 9, which results in the inverter being unable to be stably connected to the external cold plate 9. In this embodiment, by providing the guide groove 611, the fastener can be moved along the extension direction of the guide groove 611 to a position corresponding to the mounting hole of the external cold plate 9. Even if the fixing hole 614 cannot correspond to the mounting hole, the inverter can be stably connected to the external cold plate 9 through the fastener.

[0093] In some embodiments, the fastener may be a bolt, the head of the bolt being received in the guide groove 611 .

[0094] In other embodiments, the fastener may also be a nut, which is accommodated in the guide groove 611 .

[0095] In one embodiment, a stopper 612 is disposed at the notch of the guide slot 611 , and the stopper 612 is used to limit at least a portion of the fastener within the guide slot 611 .

[0096] Exemplarily, the number of the stopper parts 612 can be two, and the two stopper parts 612 extend toward each other from the two groove walls respectively, and the distance between the two stopper parts 612 is slightly larger than the outer diameter of the screw part of the bolt, and the free ends of the two stopper parts 612 are provided with a gap, and the gap between the free ends of the two stopper parts 612 is connected to the notch of the guide groove 611; Exemplarily, the distance between the free ends of the two stopper parts 612 is equal to the width of the notch of the guide groove 611, and the width of the notch of the guide groove 611 is smaller than the width of the groove bottom. In this embodiment, see Figure 1 As shown, the stop portion 612 can be a part of the base plate 61, and the guide groove 611 extends along the width direction of the base plate 61 and penetrates the thickness surface of the base plate 61. When the cover body 8 is assembled with the base plate 61, both ends of the guide groove 611 are exposed to the outside to facilitate the installation of the fastener in the guide groove 611.

[0097] Taking the fastener as a hexagonal bolt as an example, the head of the hexagonal bolt can move in the guide groove 611 along the extension direction of the guide groove 611, and the distance between the two groove walls of the guide groove 611 is adapted to the distance between the two parallel side surfaces of the hexagonal bolt head, which can prevent the hexagonal bolt from rotating around its own axis. When the hexagonal bolt passes through the external cold plate 9, it is convenient to connect the nut and the hexagonal bolt.

[0098] In one embodiment, see Figure 4 and Figure 7 As shown, a boss 61 a is formed on one side of the bottom plate 61 close to the first circuit board 1 , and a guide groove 611 penetrates the bottom plate 61 and is formed in the boss 61 a .

[0099] By providing the boss 61a on the bottom plate 61, it is equivalent to thickening a part of the bottom plate 61, which makes it easier to provide the guide groove 611. There is no need to use a bottom plate 61 with a thicker thickness, thereby achieving lightweight products and saving costs.

[0100] In one embodiment, there are two bosses 61a, which are arranged in parallel and spaced apart along the length direction of the inverter, and the first circuit board 1 is located on the upper surface of the bosses 61a. In this way, a gap can be set between the first circuit board 1 and the bottom plate 61 to avoid interference between the components on the lower surface of the first circuit board 1 and the bottom plate 61.

[0101] In one embodiment, the guide groove 611 includes at least two groove portions with different widths, and the widths of the at least two groove portions increase sequentially along the direction from the groove opening to the groove bottom of the guide groove 611 .

[0102] Specifically, see Figure 4As shown, the guide groove 611 includes a first groove portion 6111 and a second groove portion 6112, and the first groove portion 6111 and the second groove portion 6112 are arranged along the direction from the groove mouth to the groove bottom of the guide groove 611, and the widths of the first groove portion 6111 and the second groove portion 6112 are different, wherein the first groove portion 6111 has two opposite first groove walls, the two first groove walls are parallel, and the distance between the two first groove walls is the width W1 of the first groove portion 6111; the second groove portion 6112 has two opposite second groove walls, the two second groove walls are parallel, and the distance between the two second groove walls is the width W2 of the second groove portion 6112; the width W2 of the second groove portion 6112 is greater than the width W1 of the first groove portion 6111.

[0103] By providing at least two grooves with different widths, fasteners of different types can be adapted.

[0104] In one embodiment, see Figure 7 As shown, a convex rib 613 is provided on the upper surface of the base plate 61, and the convex rib 613 is used to set a threaded hole, which penetrates the base plate 61; along the height direction of the inverter, a gap is set between the lower surface of the first circuit board 1 and the upper surface of the convex rib 613.

[0105] By providing the ribs 613, the bottom plate 61 can be partially thickened to facilitate the provision of threaded holes. Users can provide threaded holes at appropriate locations according to actual installation requirements to communicate with the mounting holes on the external cold plate 9, so that the inverter can be fixedly installed on the external cold plate 9 using bolts and nuts.

[0106] When the user processes the threaded hole, the processing can be performed from the lower surface of the base plate 61 to the direction of the convex rib 613. Since a gap is set between the lower surface of the first circuit board 1 and the upper surface of the convex rib 613 along the height direction of the inverter, the first circuit board 1 will not be damaged when the threaded hole is processed.

[0107] In one embodiment, the rib 613 is a strip plate structure, and the extension direction of the rib 613 is consistent with the width direction of the inverter. For example, the length of the rib 613 can be the same as the width of the bottom plate 61 to increase the position of the processable threaded hole to meet different installation requirements.

[0108] Exemplarily, the rib 613 may be directly connected to the boss 61 a or may be provided with a gap between the boss 61 a.

[0109] In other embodiments, the heat dissipation structure 6 further includes a third side plate and a fourth side plate (not shown in the figure), the third side plate is connected to one end of the first side plate 62 and the second side plate 63, and the fourth side plate is connected to the other end of the first side plate 62 and the second side plate 63. The space enclosed by the bottom plate 61, the first side plate 62, the second side plate 63, the third side plate and the fourth side plate is the accommodation space.

[0110] Exemplarily, the bottom plate 61, the first side plate 62, the second side plate 63, the third side plate and the fourth side plate may be integrally formed by a die-casting process, and in this case, holes for exposing the terminals may be provided on the third side plate or the fourth side plate.

[0111] To sum up, the inverter provided in this embodiment not only has smaller dimensions in height, length and width, and is suitable for installation in a smaller installation space, but also provides a variety of installation methods, and allows flexible selection of the location of fasteners, thereby reducing the selection requirements for the external cold plate 9, i.e., there is no need to select a cold plate with mounting holes at specific locations to match the fixing holes 614 on the base plate 61.

[0112] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A frequency converter, characterized in that: The inverter comprises a first circuit board, a second circuit board and a third circuit board, wherein the first circuit board and the second circuit board are both located on the same side of the third circuit board, the first circuit board and the second circuit board are arranged in parallel and spaced apart along the height direction of the inverter, the first circuit board is located below the second circuit board, and a capacitor is arranged on the first circuit board; The surface of the third circuit board is parallel to the height direction of the inverter. A transformer is provided on the side of the third circuit board facing the first circuit board. Along the height direction of the inverter, the upper surface of the second circuit board, the upper surface of the third circuit board and the upper surface of the transformer are not higher than the upper surface of the capacitor.

2. The frequency converter according to claim 1, characterized in that: The second circuit board is provided with a first avoidance gap and a second avoidance gap. Along the length direction and the width direction of the inverter, at least part of the capacitor is located in the first avoidance gap, and at least part of the transformer is located in the second avoidance gap.

3. The frequency converter according to claim 2, characterized in that: Along the length direction of the frequency converter, the capacitor is located in the first avoidance gap, and the transformer is located in the second avoidance gap.

4. The frequency converter according to claim 1, characterized in that: Along the height direction of the frequency converter, the upper surface of the third circuit board is flush with the upper surface of the capacitor.

5. The frequency converter according to any one of claims 1 to 4, characterized in that: The frequency converter further includes a heat dissipation structure having a receiving space, and the first circuit board, the second circuit board and the third circuit board are all installed in the receiving space.

6. The frequency converter according to claim 5, characterized in that: The heat dissipation structure includes a bottom plate, a first side plate and a second side plate. The first side plate and the second side plate are arranged at two ends of the bottom plate opposite to each other. The bottom plate is used to be attached to and fixedly connected with an external cold plate.

7. The frequency converter according to claim 6, characterized in that: A guide groove is provided on a side of the bottom plate facing away from the first circuit board, and the guide groove is used to accommodate at least part of the fastener so that the fastener can move along the extension direction of the guide groove to a position corresponding to the mounting hole of the external cold plate.

8. The frequency converter according to claim 7, characterized in that: A boss is formed on one side of the bottom plate close to the first circuit board, and the guide groove penetrates the bottom plate and is formed in the boss.

9. The frequency converter according to claim 8, characterized in that: The number of the bosses is two, and the two bosses are arranged in parallel and spaced apart along the length direction of the inverter, and the first circuit board is located on the upper surface of the bosses.

10. The frequency converter according to claim 7, characterized in that: The guide groove comprises at least two groove portions with different widths, and the widths of the at least two groove portions increase sequentially along the direction from the groove opening to the groove bottom of the guide groove.

11. The frequency converter according to claim 7, characterized in that: The notch of the guide groove is provided with a stopper, and the stopper is used to limit at least a part of the fastener in the guide groove.

12. The frequency converter according to claim 6, characterized in that: The upper surface of the bottom plate is provided with convex ribs, the convex ribs are used to set threaded holes, and the threaded holes penetrate the bottom plate; Along the height direction of the inverter, a gap is provided between the lower surface of the first circuit board and the upper surface of the convex rib.

13. The frequency converter according to claim 12, characterized in that: The convex rib is in a strip plate structure, and the extending direction of the convex rib is consistent with the width direction of the inverter.

14. The frequency converter according to claim 6, characterized in that: The heat dissipation structure further includes a third side plate and a fourth side plate, wherein the third side plate is connected to one end of the first side plate and the second side plate, and the fourth side plate is connected to the other end of the first side plate and the second side plate.

15. The frequency converter according to claim 5, characterized in that: The heat dissipation structure is an integrated structure.

16. The frequency converter according to any one of claims 1 to 4, characterized in that: The frequency converter further includes a plurality of terminals, and the plurality of terminals are arranged on the same side of the frequency converter.

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