Electrical appliance comprising a housing part and a lid part

Abstract

Electrical appliance comprising a housing part (1) and a lid part (20), wherein the lid part (20) is connected to the housing part (1), in particular wherein the lid part (20) covers an opening of the housing part (1), wherein a first circuit board (33) is connected to the cover part (20), wherein at least one heat-generating component (34) is pressed towards the cover part (20) by an elastically prestressed tongue section (31) of a sheet metal part (30), characterized by the fact that the first circuit board (33) is arranged on the inside of the cover part, wherein the heat-generating component (34) is electrically connected to conductor tracks (35) of the first circuit board (33), wherein the first circuit board (33) is electrically connected to the second circuit board (2) by at least partial insertion into a connector part (3) arranged on a second circuit board (2), wherein the second circuit board (2) is arranged in and connected to the housing part (1), wherein the sheet metal part (30) is held elastically prestressed towards the lid part (20) by screw parts (32) screwed into threaded holes of the lid part (20).

Description

[0001] The invention relates to an electrical device comprising a housing part and a lid part.

[0002] When a printed circuit board (PCB) is populated with components, the leads or pads are connected to the circuit traces on the board using solder. Population thus involves both the mechanical arrangement and connection of components to the PCB, as well as the electrical connection.

[0003] It is generally known that a lid part can be used to cover an opening of a housing part.

[0004] A cooling arrangement is known from EP 1 893 010 A1 as the closest prior art.

[0005] An electrical device is known from DE 196 04 124 A1.

[0006] The invention is therefore based on the objective of further developing an electrical device comprising a housing part and a lid part.

[0007] According to the invention, the problem is solved in the electrical device according to the features specified in claim 1.

[0008] Important features of the invention in the electrical device are that the electrical device has a housing part and a cover part, wherein the lid part is connected to the housing part, in particular by screws, in particular wherein the lid part covers an opening of the housing part, where a first circuit board is connected to the lid part, wherein at least one heat-generating component, in particular a controllable semiconductor switch, is pressed towards the cover part by an elastically prestressed sheet metal part, in particular by an elastically prestressed tongue section of a sheet metal part, especially for heat dissipation from the heat-generating component via the cover part to the environment.

[0009] An advantage of this design is that a simple cover can be replaced by one that incorporates an electronic circuit, including the heat-generating component. For example, a switched-mode power supply can be integrated into the cover. This allows the device to be supplied with various voltages, powering different components. The heat generated by the component is dissipated to the surrounding environment via the cover. The cover, being made of metal (especially as a die-cast metal part), effectively dissipates the heat, ensuring good thermal conductivity.

[0010] In a preferred design, the lid part is manufactured as a metal die-cast part. The advantage here is that it allows for cost-effective and simple production.

[0011] In an advantageous embodiment, the heat-generating components are mounted on a first printed circuit board, wherein the first printed circuit board, in particular conductor tracks of the first printed circuit board, can be electrically connected to a second printed circuit board, in particular to conductor tracks of a second printed circuit board, by means of at least partial insertion into a connector part, wherein the connector part is arranged on the second circuit board, in particular populated with it, The second circuit board is connected to the housing part, in particular by screws. An advantage of this is that the voltages generated on the first circuit board can be made available to the assemblies arranged on the second circuit board or to the assemblies electrically connected to the second circuit board. When the cover part is attached to the housing part, the opening of the housing part can be closed and the electrical connector actuated simultaneously. For guidance and centering during insertion, a plug-in section is formed on the cover part, and corresponding shoulders are provided on the housing part to act as contact limits when the cover part is slid onto the housing.

[0012] In an advantageous embodiment, the sheet metal part is held elastically pre-tensioned towards the cover part by a screw element, in particular by a screw head of the screw element. The advantage here is that elastic pressure is ensured, thus guaranteeing efficient heat dissipation.

[0013] In an advantageous embodiment, the first circuit board is pressed against the cover part by a screw element, particularly by a shoulder of the screw element. The advantage here is that the screw element performs several functions: on the one hand, pressing the first circuit board against the cover part, and on the other hand, elastically pre-tensioning the sheet metal part, which in turn presses the component against the cover part. In this way, a simple connection technique is achieved that simultaneously ensures good heat dissipation.

[0014] In an advantageous embodiment, the heat-generating components are arranged in a continuous recess of the circuit board. in particular such that the contact section of the cover part which serves as a contact surface for the first circuit board is less far from the circuit board than the contact section of the cover part which serves as a contact surface for the heat-generating component, In particular, the contact section of the cover part, which serves as a support surface for the first circuit board, touches the circuit board, i.e., has a negligible distance to it. An advantage of this is that the component can be soldered to the circuit traces of the circuit board via its connecting leads. Thus, the component can be suspended in the recess and is then pressed against the contact surface—i.e., the recessed contact section of the cover part—by the tongue section of the metal part, which presses against the side of the component facing away from the cover part.

[0015] In an advantageous embodiment, the housing part has a slot, in particular a through slot, where a tab section of the sheet metal part protrudes at least partially into or through the slot. An advantage of this design is that only one or two screws are needed to securely hold the sheet metal part. The slot acts as a third or fourth support point, thus securing the sheet metal part. Furthermore, the slot also acts as a limiter, preventing the sheet metal part from shifting laterally. The pre-tensioning effect of the screw(s) also presses the sheet metal part firmly against the housing part within the slot, providing additional security.

[0016] In an advantageous embodiment, the lid part has a plug-in section that adjoins a shoulder, where the step rests against a section of the edge of the opening of the housing part, The plug-in section rests against a portion of the housing wall. An advantage of this design is that the plug-in section facilitates easy guidance and centering during insertion into the housing.

[0017] In an advantageous embodiment, the housing part has cooling fins for dissipating waste heat from components, in particular controllable semiconductor switches, which are mounted on the second circuit board or are electrically connected to it. A fan is inserted into a housing pocket of the housing part, with the airflow driven by the fan flowing along the cooling fins of the housing part. This design offers the advantage of effective heat dissipation from the electronic device. Furthermore, heat can even be dissipated from the cover part, through the housing part, to the surrounding environment, especially with a strong airflow from the fan.

[0018] In a preferred embodiment, the electrical device is an inverter, a converter, or a part thereof. An advantage here is that, optionally, the cover can be fitted with the circuit board and the integrated switching power supply electronics, instead of just a simple cover.

[0019] Further advantages arise from the dependent claims. The invention is not limited to the combination of features of the claims. For those skilled in the art, further meaningful combinations of claims and / or individual claim features and / or features of the description and / or the figures will become apparent, in particular from the problem statement and / or the problem arising from a comparison with the prior art.

[0020] The invention will now be explained in more detail with the help of illustrations: In the Fig. Figure 1 shows the housing part 1 in oblique view, wherein the housing part 1 has an opening which can be covered with a lid part 20. In the Fig. Figure 2 shows the housing part 1 with the cover part 20, which is placed on top of the housing part 1 and covers the opening. In the Fig. Figure 3 shows the lid part 20 from a different viewpoint, with a first circuit board 33 arranged on the inside of the lid part 20. In the Fig. Figure 4 shows the bare lid part 20. In the Fig. Figure 5 shows the lid part 20 from a different angle.

[0021] As shown in the figures, the electrical device according to the invention has a housing part 1 with an opening.

[0022] The opening can be closed by screwing the cover part 20 to the housing part 1.

[0023] The electrical device is, for example, a converter, an inverter, or a part thereof.

[0024] As in Fig. As shown in Figure 1, a second circuit board 2 is arranged in the housing part 1, which is equipped with electronic components and at least also with a connector part 3.

[0025] For example, the controllable semiconductor switches of an inverter are electrically connected to conductor tracks of the second circuit board 2. The housing part 1 is preferably made as a die-cast part and also has cooling fins to which the heat generated by the controllable semiconductor switches mounted on the second circuit board 2 is dissipated.

[0026] The opening is located to the side of the cooling fins on housing part 1.

[0027] Threaded holes are provided in the housing part 1, into which connecting screws 22 can be screwed, the screw heads of which each press the cover part 1 against the housing part 1.

[0028] The lid part 20 has two through slots 21, in each of which a tab section of a sheet metal part 30 is inserted.

[0029] As in Fig. As shown in Figure 3, screws 32 are screwed into threaded holes, each with its respective threaded section, in a first support section 41. The sheet metal part 30 is bounded by the screw heads of the screws 32 and pressed towards the cover part 20.

[0030] The respective threaded section of the screws 32 is in the Fig. 3 not visible.

[0031] The screws 32 have a shoulder against which the circuit board 33 rests and is thus pressed towards the cover part 20 by the respective screw 32.

[0032] The sheet metal part 30 has a tongue section 31 which is elastically prestressed and presses on a heat-generating component 34, thus pressing this component 34 towards the support section 40, which is located on the inside of the cover part 20.

[0033] Components 34 are soldered to conductor tracks of circuit board 33 via their connecting pins.

[0034] By means of conductive traces 35, when the cover part 20 is attached to the housing part 1, the circuit board 33 with its conductive traces 35 is inserted into a corresponding connector part 3, which is arranged on the second circuit board 2. Thus, an electrical contact between the first and second circuit boards (2, 33) is achieved.

[0035] On circuit board 33 a switching power supply is arranged, i.e. an electronic circuit for generating different supply voltages for the electronic assemblies of the electrical device.

[0036] When the conductor tracks 35 are inserted into the connector part 3, which is mounted on the second circuit board 2, spring contacts of the connector part 3 contact the conductor tracks 35 of the first circuit board 33. Thus, the generated voltages are available for the other electrical assemblies of the electrical device, in particular for the assemblies arranged on the circuit board 2.

[0037] The support section 40 for component 34 is recessed compared to the first support section 41 and the second support section 42 for circuit board 33. This allows the sheet metal part 30 to be manufactured flat and the tongue section 31 to be produced as a stamped section.

[0038] The cover part 20 is designed as a die-cast part and covers the opening, i.e. the open shaft, of the housing part 1.

[0039] As in the Fig. 4 and Fig. As shown in Figure 5, the cover part 20 has a plug-in section 43 which has a step towards the contact surface 40, so that when the cover part 20 is plugged in, an area of ​​the edge of the opening, i.e. an area of ​​the wall of the housing part 1, rests on the step and the plug-in section 43 rests on the inside of the wall of the housing part 1.

[0040] Thus, the plug-in section 43 serves to more precisely position the cover part 20 towards the housing part 1.

[0041] The cover part 20 also functions as a heat sink. The heat generated by the heat-generating components, i.e., the controllable semiconductor switches, is transferred to the cover part 20 and dissipated there, as it is metallic and therefore has good thermal conductivity. A large portion of the heat is dissipated to the environment via the outer surface of the cover part 20. A heat flow is also transferred to the housing part 1.

[0042] The screw part 32 thus has a screw head that is wider, in particular having a larger diameter, than an axially subsequent cylindrical section of the screw part 32. The threaded section of the screw part 32 is located on the area axially facing away from this cylindrical section. Therefore, a monotonically decreasing diameter is essentially achieved in the axial direction, i.e., from the screw head to the threaded section of the screw part 32.

[0043] The housing part 1 is designed in one piece. In further embodiments according to the invention, a multi-part design of the housing part 1 is also possible, although connecting parts are then additionally required. Reference symbol list 1 housing part 2 second circuit board 3 connector part 20 lid part 21 slots, especially through slots 22 connecting screws 30 sheet metal parts 31 Tongue section of the sheet metal part 30 32 screw part 33 Circuit board 34 Heat-generating component, in particular controllable semiconductor switch 35 conductor tracks of the circuit board 33 40 Support section for component 34 41 first edition section for printed circuit board 33 42 second edition section for printed circuit board 33 43 Plug section

Claims

[1] Electrical appliance comprising a housing part (1) and a lid part (20), wherein the lid part (20) is connected to the housing part (1), in particular wherein the lid part (20) covers an opening of the housing part (1), wherein a first circuit board (33) is connected to the cover part (20), wherein at least one heat-generating component (34) is pressed towards the cover part (20) by an elastically prestressed tongue section (31) of a sheet metal part (30), characterized by , that the first circuit board (33) is arranged on the inside of the cover part, wherein the heat-generating component (34) is electrically connected to conductor tracks (35) of the first circuit board (33), wherein the first circuit board (33) is electrically connected to the second circuit board (2) by at least partial insertion into a connector part (3) arranged on a second circuit board (2), wherein the second circuit board (2) is arranged in and connected to the housing part (1), wherein the sheet metal part (30) is held elastically prestressed towards the lid part (20) by screw parts (32) screwed into threaded holes of the lid part (20). [2] Electrical appliance according to claim 1, characterized by , that the lid part (20) is made of metal, in particular is manufactured as a metal die-cast part. [3] Electrical appliance according to any of the preceding claims, characterized by , that the heat-generating component (34) is mounted on the first circuit board (33), wherein conductor tracks (35) of the first circuit board (33) are electrically connected to conductor tracks of the second circuit board (2) by means of at least partial insertion into the connector part (3). [4] Electrical appliance according to any of the preceding claims, characterized by, that the first circuit board (33) is pressed against the cover part (20) by the screw parts (32). [5] Electrical appliance according to any of the preceding claims, characterized by , that the heat-generating component (34) is arranged in a continuous recess of the first circuit board (33), such that the support section (40, 41) of the cover part, which serves as a support surface for the first circuit board (33), is spaced closer to the first circuit board (33) than the support section (40, 41) of the cover part, which serves as a support surface for the heat-generating component (34). wherein the support section (40, 41) of the cover part, which serves as a support surface for the first circuit board (33), touches the first circuit board (33), i.e. has a vanishing distance to the circuit board (33). [6] Electrical appliance according to any of the preceding claims, characterized by, that the lid part (20) has a slot, in particular a through slot, wherein a tab section of the sheet metal part (30) projects at least partially into or through the slot. [7] Electrical appliance according to any of the preceding claims, characterized by , that the lid part (20) has a plug-in section (43) which adjoins a shoulder, wherein the step abuts a section of the edge of the opening of the housing part (1), wherein the plug section (43) rests against a partial area of ​​the wall of the housing part (1). [8] Electrical appliance according to any of the preceding claims, characterized by , that the housing part (1) has cooling fins for dissipating waste heat from components (34), in particular controllable semiconductor switches, which are mounted on the second circuit board (2) or are electrically connected to it, wherein a fan is inserted into a housing pocket of the housing part (1), wherein the airflow conveyed by the fan flows along the cooling fins of the housing part (1). [9] Electrical appliance according to any of the preceding claims, characterized by that the electrical device is an inverter, a converter, or part thereof.

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