Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Patent
1997-11-05
2000-07-04
Thompson, Gregory
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
361715, 361720, H05K 720
Patent
active
06084776&
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention is based on a control device comprising at least two housing parts. In one control device, known for instance from German Utility Model DE-G bm 92 00 624.8, a printed circuit board or PCB is inserted firmly between two housing parts, that is, a housing cap and a housing bottom, with the aid of screw fastenings. The housing cap and the housing bottom are made of material that is a good heat conductor. To enable dissipating the lost heat of the power components disposed on the PCB via the housing parts, the PCB is provided with a heat-dissipating layer, for example a copper lining, a layer of tin, or a heat-conductive paste. However, modern power components in particular have such a high power loss that with the aid of the conventional heat-dissipating layer and the former structural design, it could be dissipated to the outside only with great difficulty. In other control device concepts, for heat dissipation, the entire underside of the substrate carrying the power components is provided with a heat-dissipating layer. As a result, this side of the PCB can no longer be equipped with power components, and thus more surface area is required, which entails major costs.
SUMMARY OF THE INVENTION
The control device according to the invention as defined by the characteristics of the body of the main claim has the advantage over the prior art that because of the combination according to the invention of a novel adhesive and of the structural design, a relatively high amount of lost heat can be dissipated. Except for the bearing region of the PCB on the one housing part, the PCB can be equipped in a simple way with components on both sides. Standard boards can continue to be used as the PCBs. The adhesive itself is applied to only one housing part, so that the conventional manufacturing process needs to be modified only slightly. Even after the application of the adhesive or in other words before its hardens, the adhesive has such great adhesiveness that it fixes the one housing part and the PCB, or the two parts can be adjusted together. By the combination of the novel adhesive and the modification of the construction of one housing part, heat dissipation is nearly doubled compared with previously known systems. As a result, the PCB can also be equipped with power components that have very great heat loss and thus a high power density. Electrical insulation of the PCB from the housing parts is also assured. By equipping the PCB with components on both sides, an optimal use of surface area and cost minimization are possible.
Further advantages and advantageous features will become apparent from the specification and the drawing.
BRIEF DESCRIPTION OF THE DRAWING
One exemplary embodiment of the invention is shown in the drawing and explained in further detail in the ensuing description. The sole drawing FIGURE is a section taken through a schematic view of part of a control device.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The electrical switching or control device has a PCB 10, on whose top side 11 an electronic circuit is applied, of which only one electronic component 14, which outputs lost heat in operation, is shown. In the drawing, this is shown as an SMD component (surface mounted device). In a manner not shown, the PCB 10 is connected to a plug connector in the conventional way.
The top side 11 of the PCB 10 is covered by a tub-shaped housing cap 18. Except for the region of the plug connector, the housing cap on its side walls 21 has a continuous, collarlike edge 22, which rests on the outer region of the PCB 10. To that end, the PCB 10 is free of circuit components and conductor tracks in the region of its outer edges.
The continuous edge 22 has an edge 23 at an angle, extending parallel to the respective side walls 21 and including the fax ends of the PCB 10. This angled edge 23 may be flush, on its underside 24, with the underside 25 of the PCB 10 or, as shown in the drawing, may protrude past the PCB 10.
The underside 25 of the PCB 10 is enclosed by a like
REFERENCES:
patent: 5272593 (1993-12-01), Jakob et al.
patent: 5473509 (1995-12-01), Schoettl et al.
patent: 5497495 (1996-03-01), Ishikawa et al.
Cuntz Harald
Jares Peter
Karr Dieter
Robert & Bosch GmbH
Striker Michael J.
Thompson Gregory
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