Electricity: electrical systems and devices – Electrostatic capacitors – Fixed capacitor
Patent
1989-10-13
1992-01-07
Tolin, Gerald P.
Electricity: electrical systems and devices
Electrostatic capacitors
Fixed capacitor
165185, 165395, 439485, H05K 720
Patent
active
050796720
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an electrical switching and control appartus comprising a plug-in contact strip. It is known to inject the plug pins of such switching and control devices in a plug-in base of insulating material and to make contact between the ends of the plug-in contacts located in the device housing and a printed circuit board. The printed circuit board carries one or more so-called hybrid plates with electronic circuit elements (DE-OS as disclosed in 28 06 558) and/or discrete power semiconductor components and the like.
In another construction known from WO 87/01 007 (R 20142), the power components are fastened, in addition, on a cooling plate which is supported on parallel areas of the adjacent plug-in contacts by an insulating foil and, in this way directs heat generated in the power components outward, via the plug-in contacts, to the electrical lines connected thereto. This construction is costly in production, since the printed circuit boards, the discrete components, and the cooling plate must be prefabricated and preassembled before they are inserted into the switching and control device and soldered with the connection contacts. Moreover, much space is required for such constructions, and they may not be exposed to great shock or vibration stresses when used in motor vehicles because of the relatively large dimensions of the printed circuit board.
In a switching and control device known from U.S. Pat. No. 3,805,117, hybrid plates make direct contact with the plug-in contacts of the device without the intermediary of printed circuit boards. Power semiconductor components in a discrete construction make contact with the hybrid plate which guide off their heat either via a solid enclosure or via another ceramic plate at a steel housing of the device. This construction is also costly, since it requires a metal housing for conducting the heat outward and in which special insulators are inserted for guiding through the plug-in contacts. Moreover, the steel housing is very heavy, which is very undesirable in a motor vehicle construction.
SUMMARY OF THE INVENTION
The object of the present invention is to construct an electrical switching and control device as inexpensively and compactly as possible in a hybrid circuit, wherein the power components are to be glued with the hybrid plate, likewise using hybrid technology, accompanied by sufficient dissipation of heat.
The object of the invention is achieved by providing a switching and control device in which the plug-in contacts have surface regions which contact the rear side of the hybrid plate, and are contacted at their ends by connection parts of the hybrid plate.
The switching and control device, according to the invention, has the advantage that additional parts are no longer required for conducting heat off from the power components. Both a cooling plate and a printed circuit board are dispensed with, so that the device can be produced compactly and with a small weight. Since the heat is directed outward into the connected cable harness via the plug-in contacts, the metal housing can also be replaced with a plastic housing which is substantially lighter and can be produced at less expense.
It is particularly advantageous to arrange the hybrid plate in the device so that it is resistant to shocks and vibrations. The hybrid plate is fastened on one of its longitudinal sides with the ends of the plug-in contacts via connection pins and is fixed at its other longitudinal side behind projection of a connection base which carries the plug-in contacts. Moreover, it is advisable that the hybrid plate rest on bent areas of the plug-in contacts with a surface-area contact. A reliable contact of the hybrid plate is achieved in that the ends of the plug-in contacts located in the housing are provided with crimping tongues and make contact with the connection pins of the hybrid plate or with connection wires of additional electronic components by crimping. The dissipation of heat can also be promoted in that the hybrid
REFERENCES:
patent: 3805117 (1974-04-01), Hausman
patent: 4039900 (1977-08-01), Roback
patent: 4060847 (1977-11-01), Penrod
patent: 4254447 (1981-03-01), Griffis
patent: 4409641 (1983-10-01), Jacob
patent: 4689719 (1987-08-01), Prussas
patent: 4803590 (1989-02-01), Fassel
WO 87/01007, PCT/DE 86/00110, European patent, Reinhard Fassel, Robert Bosch GmbH 2/87.
Haubner Georg
Zobl Hartmut
Robert & Bosch GmbH
Striker Michael J.
Tolin Gerald P.
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