Electricity: electrical systems and devices – Electrostatic capacitors – Fixed capacitor
Patent
1990-05-14
1991-12-31
Tolin, Gerald P.
Electricity: electrical systems and devices
Electrostatic capacitors
Fixed capacitor
165185, 211 41, 361415, H05K 720
Patent
active
050776380
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a heat sink for an electric circuit board on which is mounted at least one heat-generating component which requires cooling.
One of the most frequently used methods of designing such a heat sink is to adapt the heat sink to a certain particular component, the heat sink being fixed to the actual component upon assembly. A circuit board can thus come to include a number of different heat sinks positioned in different places on the circuit board. The work of mounting these heat sinks on the respective different components is both extensive and expensive. The scattered positioning on the circuit board of the heat sinks means that special arrangements are required in order to supply cooling air to the heat sink, which in turn results in difficulties in positioning other electronic components closer to one another on the circuit board. In the event that it is desired to position a number of circuit boards close to one another, the positioning of the heat sinks prevents these circuit boards being positioned near one another.
With a view to simplifying the mounting of the heat-generating components on a heat sink, it is known through U.S. Pat. No. 4,674,005 to arrange one heat sink which is common to several components. In this connection the heat sink extends along the one edge of the circuit board and is screwed securely on its upper side. The heat-generating components are gathered along the edge of the circuit board and under the bias of a common tensioning element bear against the heat sink. Arranging a common heat sink for several components in this manner certainly leads to advantages, but also to disadvantages. The heat sink is screwed securely to a housing enclosing the circuit board for transfer of the heat to the housing. This can be simply arranged if there is only one circuit board which is to be connected to the housing in this manner. In the event that the housing is to contain a number of circuit boards, no indication is given as to how this is to be arranged.
International patent specification W086/06334 shows how a number of circuit boards are arranged in a common housing. In this case the heat sinks are designed as base plates, which extend parallel to the respective circuit boards. The base plates are at their sides connected to the housing for further transfer of the heat. However, this design requires a relatively complicated join between the base plates which serve as heat sinks and their connection in the housing. This means that this arrangement also can be considered as complicated.
SUMMARY OF THE INVENTION
The aim of the invention is to make possible in a simpler and cheaper manner than known solutions the connection between a heat sink and a circuit board. It is also the aim of the invention to allow a number of circuit boards with heat sinks to be simply mounted in the same housing. These aims are achieved according to the invention by the arrangement being designed with an electric circuit board on which is mounted at least one heat-generating component which requires cooling and which circuit board cooperates with and is mounted to a heat sink, according to the invention. The heat-generating component is mounted to the circuit board and also is electrically connected to the circuit board and the heat-generating component is also connected to the heat sink for heat transfer from the component to the heat sink. The circuit board and the heat sink together form a mountable unit.
The heat sink has a first side that includes a slot defined in it. The circuit board has a first side edge that is received in the slot of the heat sink. The slot and the circuit board edge are correspondingly shaped. A second side of the heat sink, and particularly its opposite side, has a projecting mounting flange located on it which extends longitudinally along the second side. The mounting flange is mountable in a mounting track for the flange. Preferably, the mounting flange on the heat sink and the slot in the heat sink extend substantially in the s
REFERENCES:
patent: 4361861 (1982-11-01), Spapens
patent: 4366526 (1982-12-01), Lijoi
patent: 4674005 (1987-06-01), Lacz
patent: 4701829 (1987-10-01), Bricaud
patent: 4707726 (1987-11-01), Tinder
patent: 4716498 (1987-12-01), Ellis
patent: 4756081 (1988-07-01), Penn
patent: 4758928 (1988-07-01), Wierec
patent: 4890198 (1989-12-01), Beam
Andersen Hakan
Andersson Bernt
Danielsson Hans
Johansson Hans
SAAB Automobile Aktienbolag
Tolin Gerald P.
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