CN216721158U - Frequency converter - Google Patents

Abstract

The application provides a frequency converter, which comprises a shell, a first circuit board, a second circuit board, a third circuit board and a first connector, wherein the shell comprises a first shell and a second shell connected to the first shell, and the first shell and the second shell are jointly enclosed to form an accommodating cavity; the first circuit board, the second circuit board and the third circuit board are all positioned in the accommodating cavity, and the third circuit board is connected to the first shell; the second circuit board is connected to the second shell; one side of the first circuit board is in plug-in fit with the second circuit board through a first connector, so that the first circuit board is electrically connected with the second circuit board; the other side of the first circuit board is spliced with a third circuit board through a splicing structure and is electrically connected with the third circuit board through a welding or electric connection structure; this application mainly solves current miniwatt converter and leads to being unfavorable for automated production and the lower problem of power density owing to inside adoption cable.

Description

Frequency converter

Technical Field

The application belongs to the field of frequency converters, and particularly relates to a frequency converter.

Background

In the existing products of the low-power frequency converter, the connection between each internal electrical module of the products with the same power is mostly in a cable (including single-bundle cables, multi-bundle cables, flat cables and the like) connection mode. Firstly, the cable material cost is higher, and the cable also occupies a part of the space in the product, so that the power density of the whole product is reduced; secondly, the connection and assembly of the cables can be basically realized only by manpower, so that the difficulty of automatic production of products is increased, and the assembly time of the whole products is prolonged; in addition, when the converter is in the vibrations operating mode, the cable exists and becomes flexible easily or the risk that drops inefficacy, avoids the cable not hard up, and multiplicable point is glued technology, but the point is glued and is increased glue material cost and the man-hour of gluing again.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of the application is to provide a frequency converter, mainly solve current miniwatt frequency converter because inside adoption cable leads to being unfavorable for automated production and the lower technical problem of power density.

In order to achieve the purpose, the technical scheme adopted by the application is as follows: provided is a frequency converter including:

the shell comprises a first shell and a second shell connected with the first shell, and the first shell and the second shell jointly enclose to form an accommodating cavity;

the first circuit board is positioned in the accommodating cavity and connected to the first shell;

the second circuit board is positioned in the accommodating cavity and connected to the second shell;

the third circuit board is positioned in the accommodating cavity and connected to the first shell;

the first connector comprises a connecting seat and a connecting head which are electrically connected, wherein one of the connecting seat and the connecting head is arranged on the first circuit board, and the other one of the connecting seat and the connecting head is arranged on the second circuit board;

one side of the first circuit board is in plug-in fit with the second circuit board through the first connector, so that the first circuit board is electrically connected with the second circuit board;

the other side of the first circuit board is spliced with the third circuit board through a splicing structure and is electrically connected with the third circuit board through a welding or electric connection structure.

In one embodiment, the second housing is capable of interfacing with the first housing toward a mounting direction, the second circuit board is perpendicular to the mounting direction, and the first circuit board and the second circuit board are disposed perpendicular to each other.

In one embodiment, the insertion structure is a first card slot disposed on the third circuit board, and the first circuit board is inserted into the first card slot, so that the first circuit board and the third circuit board are perpendicular to each other.

In one embodiment, the first housing is butted with the second housing through a butting mechanism, the butting mechanism includes a flange and a groove, the plugging direction of the flange and the groove is the same as the plugging direction of the connecting seat and the connecting head, one of the flange and the groove is arranged on the first housing, and the other is arranged on the second housing.

In one embodiment, an extension portion extending towards the first circuit board is arranged on a cavity wall of the accommodating cavity, the extension portion is arranged on the second shell, a second clamping groove is formed in the extension portion, the extending direction of the second clamping groove is the same as the butting direction of the first shell and the second shell, and the first circuit board is inserted into the second clamping groove.

In one embodiment, two sides of the extending portion extend in the thickness direction of the first circuit board to form ribs, and the two ribs are used for preventing the first circuit board from being plugged by mistake.

In one embodiment, the frequency converter further comprises a keyboard board connected to the housing, and the keyboard board is electrically connected to the second circuit board through a welding or electrical connection structure.

In one embodiment, the frequency converter further comprises an expansion card, and the expansion card is electrically connected with the second circuit board through a welding or electric connection structure.

In one embodiment, the frequency converter further comprises a heat sink attached to the bottom of the housing.

In one embodiment, the frequency converter further comprises a third housing connected to the second housing.

Compared with the prior art, the beneficial effect of the converter that this application provided lies in:

during the equipment, this application can weld the connecting seat on first circuit board in advance, and weld the connector on the second circuit board in advance, then be fixed in the inboard of first casing with first circuit board, and be fixed in the inboard of second casing with the second circuit board, adopt artifical or automatic equipment to dock first casing and second casing after that, when first casing and second casing accomplish the butt joint, the butt joint is accomplished simultaneously to the connecting seat of welding on first circuit board and the connector of welding on the second circuit board, finally make first circuit board and second circuit board can the electrical connection together. By adopting the technical scheme without the structural design of cable connection, on one hand, the reliability of the electric connection of the first circuit board and the second circuit board can be enhanced, the risk of cable looseness is effectively avoided, on the other hand, the step of manual cable plugging can be omitted in the production process, so that the complexity of machine assembly is reduced, and further, a foundation is laid for the full-automatic production of frequency converter products. Moreover, under the market cost pressure, the use of cables is reduced, the cost of the frequency converter product can be effectively reduced, and the product has higher price competitiveness. In addition, the cable is not arranged in the frequency converter, so that the volume of the shell can be reduced a little, and the power density of the frequency converter product is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is an exploded schematic view of a frequency converter according to an embodiment of the present disclosure;

fig. 2 is a schematic internal diagram of a partial structure of a frequency converter according to an embodiment of the present application;

fig. 3 is a first schematic structural diagram of a hard connection among the third circuit board, the first circuit board and the second circuit board according to the embodiment of the present disclosure;

fig. 4 is a second schematic structural diagram of a hard connection among the third circuit board, the first circuit board and the second circuit board according to the embodiment of the present application;

fig. 5 is an exploded view of a third circuit board, a first circuit board and a second circuit board provided in an embodiment of the present application;

fig. 6 is a schematic structural diagram of a third circuit board according to an embodiment of the present disclosure;

fig. 7 is a schematic structural diagram of a first connector according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a second housing according to an embodiment of the present disclosure;

FIG. 9 is an enlarged view of a portion of FIG. 8 at A;

fig. 10 is a schematic structural diagram of the first housing and the second housing which are provided in the embodiment of the present application and are plugged into each other.

Wherein, in the figures, the respective reference numerals:

1. a housing; 11. a first housing;

12. a second housing; 121. an extension portion; 122. a second card slot; 123. ribs; 124. a first notch; 125. a second notch;

13. a third housing; 14. an accommodating chamber;

15. a docking mechanism; 151. a flange; 152. a groove;

2. a third circuit board; 21. a first card slot;

3. a first circuit board; 31. a first connection end; 32. a second connection end;

4. a second circuit board; 5. a keyboard panel; 6. expanding cards;

7. a heat sink; 71. die-casting an aluminum bottom shell; 72. a fan; 73. a fan cover;

8. a first connector; 81. a connecting seat; 82. a connector;

9. a second connector; 10. a third connector.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating 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 the present application, "a plurality" means two or more unless specifically limited otherwise.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments.

Referring to fig. 1 and fig. 2 together, a frequency converter according to an embodiment of the present application will be described. The frequency converter comprises a shell 1, a third circuit board 2, a first circuit board 3, a second circuit board 4, a keyboard board 5, an expansion card 6 and a radiator 7. In the field of the frequency converter, the first circuit board 3 is a power board, the second circuit board 4 is a control board, and the third circuit board 2 is a power board.

Referring to fig. 1, 2 and 10, the housing 1 includes a first housing 11, a second housing 12 and a third housing 13 connected in sequence. The end of the second casing 12 facing the first casing 11 is provided with a first notch 124, a groove wall of the first notch 124 and the first casing 11 together enclose to form an accommodating cavity 14, and the third circuit board 2, the first circuit board 3 and the second circuit board 4 are respectively arranged in the accommodating cavity 14. In addition, one end of the second casing 12 facing the third casing 13 is opened with a second notch 125, the keyboard board 5 and the expansion card 6 are accommodated in the second notch 125, and the third casing 13 is used for covering the second notch 125 to cover the keyboard board 5 and the expansion card 6.

Referring to fig. 1, in the present embodiment, the heat sink 7 includes a die-cast aluminum bottom case 71, a fan 72 and a fan cover 73. The die-cast aluminum bottom shell 71 is of a hollow structure design, the fan 72 is fixed on one side of the die-cast aluminum bottom shell 71, and the fan cover 73 covers one side, back to the die-cast aluminum bottom shell 71, of the fan 72. The first housing 11 is fixed on the top of the die-cast aluminum bottom case 71, and in operation, the third circuit board 2, the first circuit board 3 and the second circuit board 4 will radiate heat in the accommodating cavity 14, and the heat is transferred to the die-cast aluminum bottom case 71 through air, and the heat on the surface of the die-cast aluminum bottom case 71 can be rapidly taken out through the rotation of the fan 72.

In the prior art, the control panel inside the frequency converter is connected with the keyboard panel 5 through a network cable, the control panel inside the frequency converter is connected with the drive board or the power panel through a flat cable, the power panel inside the frequency converter is connected with the power panel through a flat cable, and the expansion card 6 inside the frequency converter is connected with the control panel through a flat cable.

Referring to fig. 1 to 4 together, the third circuit board 2 and the first circuit board 3 are hard-wired, the first circuit board 3 and the second circuit board 4 are hard-wired, the second circuit board 4 and the keyboard board 5 are hard-wired, and the second circuit board 4 and the expansion card 6 are also hard-wired. By hard-wired, it is understood that the connection is by means of a connector or welding. By adopting the hard connection mode, on one hand, the reliability of the frequency converter product can be enhanced, the risk of cable looseness is effectively avoided, and on the other hand, the step of manually plugging the cable can be omitted in the production process, so that the complexity of machine assembly is reduced, and a foundation is laid for full-automatic production of the frequency converter product. Moreover, under the market cost pressure, the use of cables is reduced, the cost of the frequency converter product can be effectively reduced, and the product has higher price competitiveness. In addition, the cable is not arranged in the frequency converter, so that the volume of the shell 1 can be reduced a little, and the power density of the frequency converter product is improved.

Specifically, referring to fig. 3-6, the first circuit board 3 has a first connection end 31 and a second connection end 32, in this embodiment, the first connection end 31 is directly soldered on the third circuit board 2, the second connection end 32 is electrically connected to the second circuit board 4 through the first connector 8, and the second connection end 32 is not soldered on the second circuit board 4 because the first connection end 31 and the second connection end 32 are disposed opposite to each other, and after the first connection end 31 is soldered on the third circuit board 2, the second connection end 32 is difficult to solder on the second circuit board 4 due to compactness. In other embodiments, the second connection end 32 can be soldered on the second circuit board 4 if the first connection end 31 and the second connection end 32 are not oppositely disposed. In addition, in order to improve the position accuracy of the first circuit board 3 soldered on the third circuit board 2, in this embodiment, the first card slot 21 is disposed on the third circuit board 2, during assembly, the first circuit board 3 may be inserted along the first card slot 21, and then the first connection end 31 (i.e., the solder foot) of the first circuit board 3 is soldered on the third circuit board 2, after the soldering is completed, the first circuit board 3 and the third circuit board 2 are disposed in a mutually perpendicular manner.

Referring to fig. 5 and 7, the first connector 8 is preferably of a built-in type structure. Specifically, first connector 8 includes connecting seat 81 and connector 82 of pegging graft each other, and wherein connecting seat 81 welds the top at first circuit board 3, and connector 82 welds the bottom at second circuit board 4, through the butt joint of connecting seat 81 and connector 82, can guarantee the reliability of first circuit board 3 and second circuit board 4 joint strength on the one hand, and on the other hand can ensure the correct butt joint of first circuit board 3 and second circuit board 4, avoids appearing first circuit board 3 and second circuit board 4 and inserts wrong problem. After the first circuit board 3 and the second circuit board 4 are connected by the first connector 8, the first circuit board 3 and the second circuit board 4 are perpendicular to each other, and equivalently, after the assembly is completed, the third circuit board 2 and the second circuit board 4 are parallel to each other.

Referring to fig. 5, in the present embodiment, the expansion card 6 is electrically connected to the second circuit board 4 through the second connector 9, and the keyboard board 5 is electrically connected to the second circuit board 4 through the third connector 10.

From the above, the conventional flexible cable is abandoned in this embodiment, the assembly efficiency of the frequency converter can be greatly improved, and in order to further improve the efficiency of manually assembling the frequency converter and reduce the difficulty and cost of automated production of the frequency converter, the present embodiment further performs the structural design of blind insertion on the first circuit board 3 and the second circuit board 4, the blind insertion here can be understood as that an assembler only needs to butt the first casing 11 and the second casing 12 against each other, and can simultaneously realize the mutual butt joint of the connecting seat 81 at the top of the first circuit board 3 and the connecting head 82 at the bottom of the second circuit board 4, thereby realizing the electrical connection between the first circuit board 3 and the second circuit board 4, please refer to fig. 1, fig. 2, fig. 8 and fig. 10 together, and the design idea is specifically as follows:

in the present embodiment, the third circuit board 2 is designed to be fixed to the first housing 11 with a high position accuracy, the second circuit board 4 is designed to be fixed to the bottom of the first notch 124 of the second housing 12 with a high position accuracy, then the outer edge of the top of the first housing 11 is provided with the flange 151 protruding upward, and the outer edge of the bottom of the second housing 12 is provided with the groove 152 recessed upward, and the flange 151 is inserted into the groove 152, so that the first housing 11 and the second housing 12 can be assembled to have a high relative position accuracy, and equivalently, by providing the flange 151 and the groove 152, the first housing 11, the third circuit board 2, the second circuit board 4, and the second housing 12 can be ensured to have a high relative position accuracy, and since the first circuit board 3 is inserted into the first card slot 21, the first circuit board 3 can be soldered to the third circuit board 2 with a high position accuracy, therefore, during on-site assembly, an operator only needs to plug the first housing 11 and the second housing 12 into each other, and the connection seat 81 at the top of the first circuit board 3 and the connection head 82 at the bottom of the second circuit board 4 can be butted to each other at the same time. In other words, in order to electrically connect the first circuit board 3 and the second circuit board 4, the operator does not need to butt the connection socket 81 and the connection head 82 from the outside, but only needs to butt the first housing 11 and the second housing 12 directly against each other.

The flange 151 and the groove 152 together form a docking mechanism 15, and the docking mechanism 15 is not limited to the above-mentioned structure, for example, in another embodiment, the top of the first housing 11 may be provided with the groove 152, and the bottom of the second housing 12 may be provided with the flange 151, so that the first housing 11 and the second housing 12 can be docked with each other.

However, when the connecting seat 81 and the connecting head 82 are inserted into the accommodating cavity 14 in a blind manner, the first circuit board 3 originally soldered on the third circuit board 2 may be shifted, so that the blind insertion fails, and even if the blind insertion succeeds, the shift of the third circuit board 2 may damage some small electronic components, which may cause troubles for subsequent maintenance, and further increase the production cost of the product. To this end, referring to fig. 8 and fig. 9, in this embodiment, an extending portion 121 is further disposed at the bottom of the first slot 124, the extending portion 121 extends and protrudes toward the first circuit board 3, and a second slot 122 is disposed on the extending portion 121, and the extending direction of the second slot 122 is the same as the mutual butting direction of the first housing 11 and the second housing 12, so that the first circuit board 3 can be inserted along the second slot 122 in the mutual butting process of the first housing 11 and the second housing 12 through the flange 151 and the groove 152, thereby ensuring higher relative position accuracy between the first circuit board 3 and the second housing 12, and further greatly improving the reliability of successful blind plugging of the connection seat 81 and the connection head 82. In other words, in order to ensure the reliability of blind mating of the first circuit board 3 and the second circuit board 4, the first card slot 21, the second card slot 122, and the docking mechanism 15 between the first housing 11 and the second housing 12 are necessary.

In addition, it is considered that the first circuit board 3 may be difficult to be inserted into the second card slot 122 at one time due to a problem of deformation after being processed, a problem of inaccurate soldering precision, or a problem of large deviation of part processing precision, and thus, blind insertion may fail. In view of the above, referring to fig. 8 and fig. 9, in the present embodiment, ribs 123 are further disposed on two sides of the extending portion 121, the ribs 123 extend outward along the thickness direction of the first circuit board 3, when the first housing 11 and the second housing 12 are butted with each other, if the first circuit board 3 deviates from the second card slot 122, the first circuit board 3 interferes with one of the ribs 123, at this time, the first housing 11 and the second housing 12 cannot be completely butted, and only when the first circuit board 3 is inserted into the second card slot 122, the first housing 11 and the second housing 12 can be completely butted. By arranging the two ribs 123, whether the first circuit board 3 is reliably inserted into the second card slot 122 can be determined, so that the reliability of successful blind insertion of the connecting seat 81 and the connecting head 82 is further improved.

Referring to fig. 1 and fig. 2, the assembling steps of the frequency converter of the present embodiment can refer to the following steps:

the method comprises the following steps: the connecting seat 81 is welded on the first circuit board 3 in advance by manual or automatic equipment, and the connecting head 82 is welded on the second circuit board 4 in advance by manual or automatic equipment;

step two: inserting the first circuit board 3 into the first card slot 21 on the third circuit board 2 by manual or automatic equipment, and welding the first circuit board 3 on the third circuit board 2, wherein the first circuit board 3 is integrated on the third circuit board 2 and is vertical to the third circuit board 2;

step three: fixing the third circuit board 2 with the first circuit board 3 on the top of the first shell 11 by manual or automatic equipment;

step four: fixing the second circuit board 4 on the bottom of the first notch 124 of the second housing 12 by using manual or automatic equipment;

step five: inserting a flange 151 at the top of the first housing 11 into a groove 152 at the bottom of the second housing 12 by using manual or automatic equipment, so that the first housing 11 and the second housing 12 are butted with each other, and in the process of butting the first housing 11 and the second housing 12, the connecting seat 81 and the connecting head 82 in the accommodating cavity 14 are butted in a blind-insertion manner at the same time, so that the second circuit board 4 and the first circuit board 3 are successfully electrically connected, and when the first housing 11 and the second housing 12 are butted in place, the first housing 11 and the second housing 12 are automatically buckled together in a snap-fit manner;

step six: inserting the expansion card 6 to the second circuit board 4 through the second connector 9 by using manual or automatic equipment, and fixing the expansion card 6 in the second notch 125 at the top of the second shell 12;

step seven: inserting the keyboard board 5 to the second circuit board 4 through the third connector 10 using a manual or automatic device, and fixing the keyboard board 5 in the second notch 125 at the top of the second housing 12;

step eight: the third shell 13 is covered on the second notch 125 by manual or automatic equipment, and at this time, the third shell 13 is buckled on the top of the second shell 12 in a snap-fit connection manner;

step nine: a fan 72 and a fan cover 73 are sequentially arranged on one side of the die-cast aluminum bottom shell 71 to form a complete radiator 7;

step ten: the first shell 11 is buckled on the top of the die-casting aluminum bottom shell 71 in a buckling connection mode, and the complete assembly of the frequency converter is completed at the moment.

The above embodiment is based on the first circuit board 3 being welded on the third circuit board 2 and the first circuit board 3 and the second circuit board 4 being connected through the connector, in another embodiment, the first circuit board 3 can be designed to be welded on the second circuit board 4, then the first circuit board 3 is designed to be connected with the third circuit board 2 through the connector, at this moment, the first circuit board 3 needs to be welded on the second circuit board 4 in advance, the purpose of blind-mate butt joint of the first circuit board 3 and the third circuit board 2 can be realized by adopting the butt joint mechanism 15, thereby simplifying the production process of the frequency converter product, greatly reducing the difficulty of automated production, and thereby greatly improving the production efficiency of the frequency converter product.

The foregoing is considered as illustrative only of the preferred embodiments of the utility model, and is presented merely for purposes of illustration and description of the principles of the utility model and is not intended to limit the scope of the utility model in any way. Any modifications, equivalents and improvements made within the spirit and principles of the utility model and other embodiments of the utility model without the creative effort of those skilled in the art are included in the protection scope of the utility model based on the explanation here.

Claims (10)

1. A frequency converter, comprising:

the shell (1) comprises a first shell (11) and a second shell (12) connected to the first shell (11), wherein the first shell (11) and the second shell (12) jointly enclose to form an accommodating cavity (14);

a first circuit board (3) located inside the housing cavity (14) and connected to the first housing (11);

a second circuit board (4) located within the housing cavity (14) and connected to the second housing (12);

a third circuit board (2) located inside the housing chamber (14) and connected to the first housing (11);

the first connector (8) comprises a connecting seat (81) and a connecting head (82) which are electrically connected, wherein one of the connecting seat (81) and the connecting head (82) is arranged on the first circuit board (3), and the other one of the connecting seat (81) and the connecting head (82) is arranged on the second circuit board (4);

one side of the first circuit board (3) is in plug-in fit with the second circuit board (4) through the first connector (8), so that the first circuit board (3) is electrically connected with the second circuit board (4);

the other side of the first circuit board (3) is spliced with the third circuit board (2) through a splicing structure and is electrically connected with the third circuit board (2) through a welding or electric connection structure.

2. The frequency converter of claim 1, wherein: the second shell (12) can be in butt joint with the first shell (11) towards the installation direction, the second circuit board (4) is perpendicular to the installation direction, and the first circuit board (3) and the second circuit board (4) are perpendicular to each other.

3. The frequency converter of claim 1, wherein: the plug-in structure is a first card slot (21) arranged on the third circuit board (2), and the first circuit board (3) is plugged in the first card slot (21) so that the first circuit board (3) and the third circuit board (2) are perpendicular to each other.

4. The frequency converter of claim 1, wherein: first casing (11) through a docking mechanism (15) with second casing (12) dock mutually, docking mechanism (15) are including flange (151) and recess (152) of pegging graft mutually, flange (151) with the grafting direction of recess (152) with connecting seat (81) with the grafting direction of connector (82) is the same, flange (151) with one of them locates in recess (152) first casing (11), and wherein another locates second casing (12).

5. The frequency converter of claim 1, wherein: an extension part (121) extending towards the first circuit board (3) is arranged on the cavity wall of the accommodating cavity (14), the extension part (121) is arranged on the second shell (12), a second clamping groove (122) is formed in the extension part (121), the extension direction of the second clamping groove (122) is the same as the butt joint direction of the first shell (11) and the second shell (12), and the first circuit board (3) is inserted into the second clamping groove (122).

6. The frequency converter of claim 5, wherein: the two sides of the extension part (121) extend along the thickness direction of the first circuit board (3) to form ribs (123), and the ribs (123) are used for avoiding the first circuit board (3) from being plugged by mistake.

7. The frequency converter according to any one of claims 1 to 6, characterized in that: the frequency converter further comprises a keyboard plate (5) connected to the shell (1), and the keyboard plate (5) is electrically connected with the second circuit board (4) through a welding or electric connection structure.

8. The frequency converter according to any one of claims 1 to 6, characterized in that: the frequency converter further comprises an expansion card (6), and the expansion card (6) is electrically connected with the second circuit board (4) through a welding or electric connection structure.

9. The frequency converter according to any one of claims 1 to 6, characterized in that: the frequency converter also comprises a radiator (7) connected to the bottom of the housing (1).

10. The frequency converter according to any one of claims 1 to 6, characterized in that: the frequency converter further comprises a third housing (13) connected to the second housing (12).

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