FORM 2
THE PATENTS ACT 1970 (39 OF 1970)
&
PATENTS RULES, 2006
COMPLETE SPECIFICATION (SECTION 10; RULE 13)
"REDUCTION OF ELECTROMAGNETIC FIELD IN RESONANT CIRCUIT COMPONENTS"
ALCON ELECTRONICS PVT. LTD. A COMPANY INCORPORATED UNDER THE COMPANIES ACT, 1956, HAVING ITS REGD. OFFICE AT 34-
B MIDC. INDUSTRIAL ESTATE.. STAPUIRR NASHIK- 422 007. MAHARASHTRA. INDIA.
THE FOLLOWING SPECIFICATION PARTlCULARLY DESCRIBES THE. NATURE OF THE INVENTION AND THE MANNER IN WHICH IT IS TO BE
PERFORMED:

Technical Field:
The present invention relates (o improvements in power capacitors. Particularly, the present invention relates to shielding of the capacitor element from electromagnetic field generated due to high power.
Background:
A power capacitor generally comprises of two metallic plated/ unplaled terminals placed parallel to each other and separated by impregnated capacitor clement,
The power capacitor known in the prior art are described with reference to Figures 1 (a) and 1 (b) of the provisional specification.
fig 1(a) shows a schematic in which the capacitor is in actual application when voltage is applied to its terminals and electrical field is generated around each plate.
Fig 1 (b) shows side view of the actual mounting of capacitor during application.
Referring to figures 1 (a) and 1 (b). the electric field intensity is high due to property of electromagnetism. impregnated capacitor element is soldered to each plate. This electric held induces eddy current, resulting in self heating of the capacitor.

Object of the invention:
The present invention ameliorates the aforesaid drawbacks by providing shielding to protect the capacitor element.
Another object of the present invention is to reduce the cost of the capacitor by making the bus bar design simple and cost effective.
Summary of the invention:
The present invention relates to improvements in operational life of a power capacitor by providing shielding strip of manual like copper, steel, any alloy etc to the outer side of the capacitor element.
Detailed description of the invention:
The present invention will now be described with reference to figure (21 of the provisional specification wherein the same numerals relate to the same parts:
figure 2 ta) shows an actual capacitor used in application with shielding strip. figure 2(b) shows a capacitor element shielded with tin.plated copper strip. figure 2(c). (d), (e), (0- (g) show the construction of the power capacitor. figure 3 shows shielding strip with clamps and locked with mounting clinch nut.

Figure 4 shows shielding strip riveled to terminals.
Figure 5 shows shielding strip with flange.
Figure 6 shows shielding strip fitted in the groove provided on terminal.
Figure 7 shows shielding strip with notch are notch hole on terminal.
From die figures 2. the shielding strip may he round or square/ rectangular or anv shape which covers capacitor element completely. The diameter of the shielding strip is more than the diameter of the capacitor element. Due to use of shielding strip, electric field lines generated by both terminals are shorted on the shielded strip. Both fields cancel each other.
Thickness of the shielding strip plays an important role in shielding. However. thickness is only critical at low frequencies- At high frequencies even metal foils with 5 micron thick are effective as shields.
Power capacitors are generally operated at frequency of 10 KHz.
Thickness of the shield is decided by following formula
d = Thickness of the shield F = Operating frequency
At 10 KII/.. d - 0.66 mm i.e. Thickness ofthe shield.

Annexure A clearly illustrates the thickness of the shield required at various frequencies.
Width of the soldering strip is min 75 % and max 95 % of the capacitor element width.
In the present invention, shielding strip is soldered to terminal. As an alternative manufacturing method, shielding strips are welded, soldered, riveted or boiled, brazed or can be pasted with any type of adhesive, press fitted on terminals without affecting the performance of the capacitor. Various alternatives are shown in figures 3 through 7 of the provisional specification.
Although the invention has been described in terms 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, particularly 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 placed substantially parallel to each other, wherein said terminals hold an impregnated capacitor element, such that a shielding strip is fixed to the outer side of said capacitor element.
2. A power film capacitor as claimed in Claim 1. wherein the diameter of said shielding strip is more than the diameter of said capacitor element.
3. A power film capacitor as claimed in Claim 2, wherein said shielding strip is soldered, welded, riveted, brazed, grooved, bolted or pasted with known adhesives.
4. A power film capacitor as claimed in any of the Claims 1 to 3, wherein the thickness of said shield is 66! V Operating frequency.
5. A power film capacitor as claimed in any of the Claims 1 to 3, wherein said shielding strip accommodates atleast a clamp in order to lock to said terminals.