DD143977B1 - ELECTRIC CAPACITOR WITH MULTIPLE CAPACITY - Google Patents

Description

title

Electric capacitor with multiple capacity

Field of application of the invention

The invention relates to an electrical plastic film capacitor with a plurality of capacitances for use in electronic circuits of long-distance traffic engineering, preferably in filter circuits and equalizer networks.

Characteristic of the known technical solutions

It is well known and common to incorporate plastic film capacitors with two- and multiple capacity in metal housing · In DD-PS 75 579 and the specialist area standard TGL 200-8555 / 01 such capacitors are described · In a prismatic metal housing are several individual capacities, by Polystyrene film as a dielectric and aluminum foil as a metallic covering foil gekennzeicnnet, built · The connection of the copper terminal strip with the metallic covering foil is carried out by at least 3 welds. The contact strips serving for contacting

are in turn welded to tinned copper wires and these are interconnected according to the characteristic circuit configuration for electronic circuits and fed to the pins · To reduce the volume in the housing © air volume and thus limit the effect of air humidity, which has a negative effect on the constancy of capacitance values is, according to o · g. PS the housing filled with polystyrene beads and hermetically sealed with a ceramic board by Dichtlötung ·

The disadvantages of this plastic film capacitor consist u. A · in the contact, which has too many contact points in total, which reduce the reliability · Furthermore, this Kontaktierungsvariante high losses of electrical values over wide frequency ranges on »Of crucial disadvantage is the metal housing, as Grounding is required to avoid parasitic capacitances · Kit of current design can not be guaranteed stable production with constant quality. The cause is the extremely critical Dichtlötung between ceramic board and Anschüußdraht Ьяѵг. Beaker which leads to a microclimate which is detrimental to the constancy of the electrical values at the smallest leaks due to capillary action. A required complete elimination of the trapped air volume is not possible with the proposed polystyrene balls. The economic disadvantages of the invention according to o * g.PS are the expensive ones Metal cup, the ceramic plate and the lack of automation capability of the capacitor design * In addition, the mass of the complete component is very high ·

Furthermore, it is common for some years, prismatic, sealed _f-loss capacitors built with art

fabric case (specialist area standard TGL 33 965). However, Liese capacitors are generally only offered with a capacitance value per plastic housing and are constructed as follows:

In a plastic cup, a wound capacitor, characterized by Zinnbleifolie as a metallic coating and polystyrene film as a dielectric used. The connecting wires are welded directly to the tin foil projecting on the end side of the winding and preformed in accordance with the grid design to be achieved.

To facilitate the Kontaktiervorganges and to stabilize the contact point lead-tin lead foil, the supernatant tin foil is mechanically or © thermally pretreated by pressure or temperature. The plastic sheeting is then completely filled with epoxy resin in one or more manufacturing steps «

The disadvantages of these capacitors are u. a. In addition, each capacitance value requires separate conductor tracks and contact points on the printed circuit boards, although in many cases the direct connection of two poles of Capacitors are optimal ·

From a production point of view, the entire production process of the type of capacitor must be run through for the production of each capacitance value, which is associated with considerable expenditure in terms of material usage and working time.

Object of the invention

The aim of the invention is to provide a multi-capacitance electric capacitor, which is characterized by high reliability and stability der- electrical parameters and low weight and low height.

the essence of the invention

The invention has for its object to develop an electrical capacitor which combines several capacities in a housing and has no Lufteinschiüsse. Furthermore, the number of contact points should be reduced and the occurrence of parasitic capacitances should be prevented. The object is achieved in that a plurality of capacities preferably known low attenuation wrapped with tin foil sheet plastic film capacitors are installed separately in a manufactured with cast walls plastic housing which is filled with Harzverguß and hex - - metically sealed, and wherein the Zinnbleifoliebeläge the individual capacities within of the housing are frontally contacted directly with the connecting wires so that according to the circuit configuration one or more individual capacitors either separate at the two poles or separate at one pole, connected to the second pole via a common connecting wire connection options.

Outline pi e1

The invention will be explained in more detail in an embodiment with reference to the following drawings:

Figure 1 shows the circuit diagram of a 2-capacitance design

FIG. 2 shows the plan view with installed, contacted capacitors in front of the resin encapsulation

FIG. 3 shows the capacitor in section.

The individual connected to a common lead wire 1 and zv / ei connecting wires 2 individual capacitances 3 are so in

the housing 4 is installed in such a way that the existing wall 5 isolates the capacitances 3 on one side on the overlying covering foils 6. The connecting wires 1, 2 are preoriented on the housing walls for the subsequent raking. The contacting of these connecting wires 1, 2 takes place directly on the overlying covering foils 6 , so that the minimum number of four inner solder joints is formed. Due to the unilaterally common connection wire v / ground only three holes on the circuit board needed, which is given by the imbalance for this case, the unmistakable in the assembly simultaneously · After installation of the contacted capacity of the plastic cup is filled by Harzverguß 8 and thus hermetically sealed »

The advantages of the invention are u. a. Achieving a large capacity with small mass and small dimensions · The described contacting variant greatly increases the stability of the electrical parameters and is also characterized by the saving of material. Furthermore, the encapsulation of the capacitor has achieved optimum tightness against environmental influences.

The manufacturing process of such capacitors can be automated, which is associated with considerable savings in working time.

Claims (1)

-G- Invented by it 1 · Electrical capacitor rait multiple capacity as plastic film capacitor low attenuation wrapped with tin lead coatings, executed in plastic cup with Harzverguß for use in electronic circuits of long-distance traffic, characterized ¬ by that the leads of the single capacitor windings directly with the least possible number of contact points and in which one or more specially designed dividing walls are arranged in the plastic cup to ensure a high insulation resistance of the multiple capacitance. For this 1 page drawings