FORM 2
THE PATENTS ACT, 1970
(39 OF 19700)

PATENTS RULES, 2006
COMPLETE SPECIFICATION (SECTION 10; RULE 13)
"IMPROVEMENTS IN POWER CAPACITOR"
ALCON ELECTRONICS PVT. LTD.. A COMPANY INCORPORATED UNDER THE COMPANIES ACT. 1956. HAVING ITS REGD. OFFICE AT 34-B. MIDC. INDUSTRIAL ESTATE. STAPUR, NASHIK- 422 007. MAHARASHTRA. INDIA.
THE FOLLOWING SPECIFICATION PARTICULARLY DESCRIBES THE NATURE OF' THE INVENTION AND THE MANNER IN WHICH IT IS TO BE PERFORMED:

Technical field:
The present invention relates to power film capacitors. Particularly, the present invention relates to improvements made in impregnated power film capacitors.
background:
A power film capacitor generally comprises of two metallic plated terminals placed parallel to each other and separated by insulating epoxy resin.
The power film capacitors known in the prior art are described with reference to figures 1(a) to 1(g) to the provisional specification wherein:
fig 1(a) shows the cross sectional view of the power film capacitor.
fig 1(b) shows the assembled capacitor.
fig 1 (c) shows the cross sectional view of the potted assembly.
fig 1 (d) shows the capacitor enclosed with one end closed.
fig 1 (e) shows the plastic enclosure with open end of the enclosure and filled with
insulating epoxy.
figure 1(f) and 1(g) show piece part of terminal, plastic enclosure and element.
Due to the use of capacitor as power film capacitor, excessive heat is generated in the said application. Due to this, heat capacitor performance is deteriorated in two ways :

a) Excessive heal affects the plastic enclosure in which the capacitor assembly is housed. The expansion and contraction of epoxy materials with different thermal coefficients affects the adhesion of epoxy to outer plastic enclosure and which further loads to dismantling of encapsulated assembly from the plaslic enclosure, which cause leakages from the said capacitor assembly.
b) It causes the impregnun to leak from the said capacitor assembly, i.e. from the both the terminals (refer to ihe figures 1(d) and fig 1(e)). Due 10 the aforesaid reasons, the power film capacitor gets redundant.
Object of the invention:
The aforesaid practical constraints lead to invent effective assembly method of power film capacitors. The present invention obviates the aforesaid drawbacks by-improving assembly meihod of power film capacitor.
Summary of the invention;
The present invention relates to a power film capacitor comprising of at least two metallic plated terminals placed parallel to each other and separated by insulating CPU\\ fesin. said terminals holding an impregnated capacitor. To prevent the leakage of impregnanl from the capacitor assembly, the present invention is improved in following two invented stages, which are independent of each oiher:

A.) Eliminating outer plastic enclosure bv epoxy casting; and
11) Introducing an- isolator, which is made up of rubber and silicon. Further.
Nitril is placed between the terminals and epoxy. Isolator can be of any
shape round, square as per lermina! shape and size.
Both the aforesaid stages improves the capacitor assembly.
Detailed description of the invention:
The present invention will now be described with reference to. Figure (2) of the provisional specification, wherein the same umerals relate to the same parts:
Figure 2 (a) shows the cross sectional view of the casted power film capacitor.
Figure 2(b) shows the entire capacitor assembly, which is potted in casting.
Figure 2(c) shows the cross sectional view of the casted and cured capacitor
assembly.
Figure 2(d) shows casted capacitor assembl;.
Figure 2(e) and 2(f) show modified terminal with groove for isolator insertion.
Stage A
Referring to Figure 2(a). a power film capacitor comprises of at least two meLallic terminals (2) and (3) placed parallel to each other. Terminals (2) and (3) bold the

impregnated capacitor..The whole assembly (Fig 2(b)) is casted. This cast is filled with insulating epoxy resin. The casting is molded and is removed after complete curing of epoxy Capacitor assembly is encapsulated with epoxy medium, which significantly improves the heal dissipation.
stage B
capacitor assembly. But due to excessive heal, there is leakage of impregnant from both terminals. This is because of poor adhesion of terminals to epoxy.
To improve adhesion of terminals to epoxy. an isolator is inserted between terminal and epoxy. Isolator is boused on terminals with groove provided. The isolator is made up of rubber, nitril or silicon material. Isolator has belter adhesion with terminals and with epoxy which stops the imprgenanl to leak from terminal side. The whole assembly (fig 2(b)) is potted in casting. This cast is filled with insulating epoxy resin. After curing of epoxy whole casted assembly is removed after compieic curing.
Both terminals arc soldered to the capacitor element. This improved method of manufacturing prevents impregnate leakage from the said capacitor assembly and improves the operational life of the power film capacitor.

Although the invention has been described in terras of particular embodiments and applications, one of ordinary skill in the art. in light of this teaching, can generate additional embodiments and modifications without departing from the spirit of or exceeding the scope of the claimed invention. It should be emphasized that the above-described embodiments of the present invention, particular!) any "preferred" embodiments, are merely possible examples of the invention of implementations, merely set forth for a clear understanding of the principles of the invention. Accordingly, it is to be understood that the drawings and descriptions herein are preferred by way of example to facilitate comprehension of the invention and should not be construed to limit, the scope thereof.

We Claim:
1. A power film capacitor comprising of at least two metallic plate terminals (2) and (3) placed substantially parallel to each other and separated by insulating epoxy resin, wherein said terminals hold an impregnated capacitor.
2. A power film capacitor as claimed in Claim 1, wherein said metallic plates are casted before said epoxy resin is filled.
3. A power film capacitor as claimed in Claim 2, wherein said casting is molded and removed after curing of said epoxy.
4. A power film capacitor as claimed in any of the Claims 1 to 3, further comprising of an isolator between at least one of said terminals said epoxy resin.
5. A power film capacitor as claimed in Claim 4, wherein said isolator is of rubber, nitril or silicon material.
6. A power film capacitor as claimed in Claim 4 or 5, wherein said terminal is provided with a grove to house said isolator.