Title of Invention	AN EQUIPMENT FOR A CHARGE/DISCHARGE TEST OF A METALLISED FILM CAPACITOR TO DETERMINE ITS CURRENT HANDLING CAPACITY
Abstract	The present invention relates to the charge/discharge test of a metallised plastic film capacitor by applying Direct Current (DC) voltage and discharging it through the selected resistor. The equipment comprises : an AC power supply unit, control unit, output unit and Alternating Current (AC) to Direct Current (DC) converter. An AC power supply unit generates 0 to 230 V variable AC power being converted to 400VDC variable as per the requirement of voltage. The control unit provides a fixed number of charge/discharge cycles for the test operation, The control unit comprises : two digit thumb wheel switch to set desired time for charge/discharge; and allows desired number of charge/discharge cycles pulses at the output, settable from 1 to 99; a flip-flop having "SET' and "RESET" terminals, to start and reset the timer; a pair of monostable multivibrator for providing square wave pulse outputs for setting and resetting the flip flop; foot switch is connected to "SET" terminal of the flip flop through one monostable multivibrator to start the counter; count over output is connected to reset terminal of the flip flop through the second monostable multivibrator to stop and reset the counter; solid state switch to ensure that only fixed number of pulses being decided by the control unit to be given to output unit. The output unit provides an amplitude controlled DC voltage to the capacitor for charging purpose, said output unit is connected to control unit, said output unit consists of variable transformer unit for providing variable amplitude DC voltage. The AC to DC converter is connected to AC power supply unit for providing DC power supply to control unit and output unit. Also a method of manufacturing a metallised plastic film capacitor with frequency clearing as one of the step is disclosed.

Title of Invention

AN EQUIPMENT FOR A CHARGE/DISCHARGE TEST OF A METALLISED FILM CAPACITOR TO DETERMINE ITS CURRENT HANDLING CAPACITY

Abstract

The present invention relates to the charge/discharge test of a metallised plastic film capacitor by applying Direct Current (DC) voltage and discharging it through the selected resistor. The equipment comprises : an AC power supply unit, control unit, output unit and Alternating Current (AC) to Direct Current (DC) converter. An AC power supply unit generates 0 to 230 V variable AC power being converted to 400VDC variable as per the requirement of voltage. The control unit provides a fixed number of charge/discharge cycles for the test operation, The control unit comprises : two digit thumb wheel switch to set desired time for charge/discharge; and allows desired number of charge/discharge cycles pulses at the output, settable from 1 to 99; a flip-flop having "SET' and "RESET" terminals, to start and reset the timer; a pair of monostable multivibrator for providing square wave pulse outputs for setting and resetting the flip flop; foot switch is connected to "SET" terminal of the flip flop through one monostable multivibrator to start the counter; count over output is connected to reset terminal of the flip flop through the second monostable multivibrator to stop and reset the counter; solid state switch to ensure that only fixed number of pulses being decided by the control unit to be given to output unit. The output unit provides an amplitude controlled DC voltage to the capacitor for charging purpose, said output unit is connected to control unit, said output unit consists of variable transformer unit for providing variable amplitude DC voltage. The AC to DC converter is connected to AC power supply unit for providing DC power supply to control unit and output unit. Also a method of manufacturing a metallised plastic film capacitor with frequency clearing as one of the step is disclosed.

Full Text	FORM 2 THE PATENTS ACT. 1970 (39 FO 1970) & PATENT RULES, 2003 PROVISIONAL/COMPLETE SPECIFICATION (See section 10 and rule 13) 1.TITLE OF THE INVENTION : An Equipment and method to check current handling capacity Metallised Plastic Film capacitor for CDI application. 2. APPLICANT(S) (a) Name : CTR Manufacturing Industries Ltd. (b) Nationality : Indian Company (c) Address: E 1, Chikalthana, (d) AURANGABAD-431210, MAHARASHTRA, INDIA PREAMBLE TO THE DESCRIPTION The following specification particularly describes the invention and the manner in which it is to be performed. FIELD OF INVENTION The present invention relates to check the current handling capacity of a metallised plastic film capacitor by inducing /passing desired amount of DC current through the capacitor. More particularly it relates to an equipment to simulate the field condition for CDI application of automobile. It also relates to method of manufacturing a capacitor which includes charge/discharge as one of the step to achieve desired characteristics of the metallised plastic film capacitor for CDI application. PRIOR ART : The self healing property and current handling capacity of the metallised plastic film capacitor offers a distinct advantage over the film foil capacitors. These properties depends upon the contact/adhesion between metal coating on the plastic film and the metal sprayed on both sides of capacitor element to form the two contact metal plates of the plastic film capacitor and result of the extreme thinness of the metallised electrode material. If the contact is weak then a contact resistance is formed. When current passes through this contact resistance, heat is generated resulting in shrinkage of metallised plastic film and not withstanding the required current. Wherever improvement in performance, withstanding current carrying capacity and avoidance of premature failure of a metallised plastic film capacitor charging/discharging is a must ie.e simulation of field condition for CDI explication.. The absence of Charge/Discharge test while manufacturing leads to: 1. Loose contact 2. Arcing 3. End spray metal on body which will reduce Insulation Resistance 4. Short circuit of capacitor 5. hjratic tan delta readings 6. More power loss across the capacitor leading to heating of capacitor 7. More capacitance loss leading to reduce life span of capacitor and CDI unit. The above mentioned method of prior art discusses only the disadvantages such as premature failure, enatic change in tan delta, loss of power and electrical characteristics. Thus the above mentioned method for testing current handling capacity of a metallised plastic film capacitor along with aforementioned disadvantages associated with them makes it necessary to provide a system/ equipment/device which will overcome the above drawbacks of the prior art and confirm specified current handling capacity of a metallised plastic film capacitor successfully. OBJECTIVE OF THE INVENTION : The main objective of the present invention is to provide an equipment, which eliminates the above said drawbacks associated with the prior equipment and method for providing charge/discharge of metallised film capacitor. Another objective of the present invention is to provide an equipment of charge/discharge of a metallised plastic film capacitor by applying DC current to confirm current handling capacity and to improve electrical characteristics Yet another objective of the present invention is to provide an improved foolproof equipment and method for charge/discharge system for metallised plastic film capacitor resulting in prevention of premature failures. Yet another objective of the present invention is to provide and equipment an method for current handling apacity of a capacitor due to, end spray metal and termination contact. Yet another objective of the present invention is to check erratic change in tan delta readings, power loss across the plastic film capacitor. Yet -.mother objective of the present invention is to check current handling capacity and enhance the life of a plastic film capacitor, improve reliability through better electrical characteristics of a metallised plastic film capacitor. Yet another objective of the present invention is to provide an equipment and method for current handling capacity of a plastic film capacitor which is economical and having simple operation. STATEMENT OF THE INVENTION : Accordingly in order to achieve the above mentioned objects, there is provided an equipment to provide charge/discharge test of a metallised plastic film capacitor, the said equipment comprises : .an DC power supply unit for generating 0 to 400V variable DC voltage; .Control unit for providing a desired number of charge/discharge cycles required for the test, said control unit comprises : ? a two digit thumb wheel switch which counts time for charge/discharge test and allows desired number o\' cycles at the output, settable from 1sec to 99minutes; ? a flip-flop having "'SET" and "RESET" terminals, to start and reset the timer; ? count over output is connected to reset terminal of the flip flop through the second monostable multivibrator to stop and reset the counter. ? Solid state switch to ensure that only fixed number of pulses being decided by the control unit to be given to output unit, input of said solid state switch is connected to the output of the flip-flop: Output unit to provide an amplitude controlled DC voltage for charge/discharge test for charging the capacitor, le discharge resistance is selectable and its connections are provided on the rear panel of the equipment, said output unit is connected to and controlled by said control unit, said output unit consists of variable transformer unit for providing variable amplitude DC voltage; and AC to DC converter/rectifier being connected to AC supply unit for providing DC1 power supply to said control unit and output unit. The equipment has five station facility to test capacitors. Also there is provided a method of manufacturing a metallised plastic film capacitor with frequency clearing as one of the step, said method comprising steps of a placing in a vacuum a plastic dielectric film and depositing a thin layer of metal alloy as an electrodes on it; b. Winding a metallised film into a cylinder so that a metallised edge extends on each end of the wound capacitor coil; c. Spraying both ends with small droplets of molten metal that adhere along and make contact with the metallisation on the film; d. Soldering /welding the wire lead to this end sprayed metallised portion for making termination contact; e. Applying amplitude controlled DC voltage for charging the capacitor and discharging through resistor 50 times in one second and continue for desired time period, thereby checking current handling capacity of the plastic film capacitor; and f Encapsulating and sealing said capacitor coil obtained in step (e). BRIEF DESCRIPTION OF THE DRAWINGS : Figure 1 : Shows the wave forms of a voltage across the capacitor available in prior art. Figure 2 : Shows block diagram of an equipment to provide charge/discharge test on metallised plastic film capacitor at a frequency of 50Hz in accordance to present invention. Figure 3 : Shows the wave form of a voltage across the capacitor in accordance to the present invention. Figure 4 : Shows wound capacitor coil Figure 5 : Shows cross sectional area of wound capacitor coil Figure 6 : Shows wound capacitor coil with end spray metallisation Figure 7 : Shows capacitor coil with end spray metallisation and termination welded Figure 8 : Shows wound capacitor coil with charge/discharge test Figure 9 : Shows process flow chart for the said invented process DETAIL DESCRIPTION OF THE INVENTION : The above, and the other objects, features and advantages of invention will become apparent from following description read in conjunction with the accompanying drawings. Now referring to figure 2 and equipment to provide charge/discharge test of metallised plastic film capacitor in accordance to present invention is shown. Basically the equipment provides and amplitude controlled DC voltage for charging the capacitor and discharging it through selected resistor for the purpose of checking current handling capacity. The equipment comprises : a two digit thumb wheel switch which counts time for charge/discharge test and allows desired number of cycles at the output, settable from 1sec to 99minutes; ? a flip-flop having "SET' and "RESET' terminals, to start and reset the timer; ? count over output is connected to reset terminal of the flip flop through the second monostable multivibrator to stop and reset the counter. ? Solid state switch to ensure that only fixed number of pulses being decided by the control unit to be given to output unit, input of said solid state switch is connected to the output of the flip-flop; itput unit to provide an amplitude controlled DC voltage for charge/discharge test for charging the capacitor, the discharge resistance is selectable and its connections are provided on the rear panel of the equipment, said output unit is connected to and controlled by said control unit, said output unit consists of variable transformer unit for providing variable amplitude DC voltage; and AC to DC converter/rectifier being connected to AC supply unit for providing DC power supply to said control unit and output unit. The equipment has five station facility to test capacitors. All these above mentioned steps are shown in flowchart form in figure 9. INDUSTRIAL APPLICABILITY: The equipment and method to charge/discharge test of a metallised plastic film capacitor in accordance to present invention applies DC voltage for charging the capacitor and discharging it through selected resistor thereby checking its current handling capacity, and improves electrical characteristics like high voltage withstanding, tan delta improvement and also performance of capacitor during operation. The metallised plastic film capacitor obtained by the equipment and method of the present invention is useful in electronic, automobile as well as electrical industries. It is useful in various electronic and electrical circuits where high current carrying capacity as well as better performance of the plastic film capacitor is required. The present invention is not limited to the above described embodiments, and various alterations, modifications, and/ or alternative applications of the invention may be possible, if desired, without departing from the scope and spirit of the invention, which can be read from the claims and the entire specification. All these possible alterations, modifications, and / or alternative applications of the invention are also intended to be within technical scope of the present invention. WE CLAIM : 1. An equipment to provide charge/discharge test of a metallised film capacitor, said equipment comprises : ? a two digit thumb wheel switch which counts time for charge/discharge test and allows desired number of cycles at the output, settable from 1sec to 99minutes; ? a flip-flop having "SET' and "RESET' terminals, to start and reset the timer; ? count over output is connected to reset terminal of the flip flop through the second monostable multivibrator to stop and reset the counter. ? Solid state switch to ensure that only fixed number of pulses being decided by the control unit to be given to output unit, input of said solid state switch is connected to the output of the flip-flop; Output unit to provide an amplitude controlled DC voltage for charge/discharge test for charging the capacitor, the discharge resistance is selectable and its connections are provided on the rear panel of the equipment, said output unit is connected to and controlled by said control unit, said output unit consists of variable transformer unit for providing variable amplitude DC voltage; and AC to DC converter/rectifier being connected to AC supply unit for providing DC power supply to said control it and output unit. The equipment has five station facility to test capacitors. 2. An equipment to provide charge/discharge test of metallised plastic film capacitor as claimed in claim1 wherein said variable transformer unit is powered by AC power supply unit. 3. An equipment to provide charge/discharge test of metallised plastic film capacitor as claimed in claim 1, where the said output unit and control unit are connected to each other through thyristor. 4. A method of manufacturing manufacturing a metallised plastic film capacitor with frequency clearing as one of the steps, said the method comprising steps of: a placing in a vacuum a plastic dielectric film and depositing a thin layer of metal alloy as an electrodes on it; b. Winding a metallised film into a cylinder so that a metallised edge extends on each end of the wound capacitor coil; c. Spraying both ends with small droplets of molten metal that adhere along and make contact with the metallisation on the film; d. Soldering /welding the wire lead to this end sprayed metallised portion for making termination contact; e. Applying amplitude controlled Direct Current (DC) voltage to the capacitor and discharging it through selected resistor, thereby checking current handling capacity and metal spray and termination contact.; and f. Encapsulating and sealing said capacitor coil obtained in step (e). 5. An equipment to provide charge/discharge test of metallised plastic film capacitor as herein described and illustrated with reference to accompanying drawings. 6. A method of manufacturing a metallised plastic film capacitor with charge/discharge test as one of the step as herein described and illustrated with reference to accompanying drawings. ABSTRACT The present invention relates to the charge/discharge test of a metallised plastic film capacitor by applying Direct Current (DC) voltage and discharging it through the selected resistor. The equipment comprises : an AC power supply unit, control unit, output unit and Alternating Current (AC) to Direct Current (DC) converter. An AC power supply unit generates 0 to 230 V variable AC power being converted to 400VDC variable as per the requirement of voltage. The control unit provides a fixed number of charge/discharge cycles for the test operation, The control unit comprises : two digit thumb wheel switch to set desired time for charge/discharge; and allows desired number of charge/discharge cycles pulses at the output, settable from 1 to 99; a flip-flop having "SET' and "RESET" terminals, to start and reset the timer; a pair of monostable multivibrator for providing square wave pulse outputs for setting and resetting the flip flop; foot switch is connected to "SET" terminal of the flip flop through one monostable multivibrator to start the counter; count over output is connected to reset terminal of the flip flop through the second monostable multivibrator to stop and reset the counter; solid state switch to ensure that only fixed number of pulses being decided by the control unit to be given to output unit. The output unit provides an amplitude controlled DC voltage to the capacitor for charging purpose, said output unit is connected to control unit, said output unit consists of variable transformer unit for providing variable amplitude DC voltage. The AC to DC converter is connected to AC power supply unit for providing DC power supply to control unit and output unit. Also a method of manufacturing a metallised plastic film capacitor with frequency clearing as one of the step is disclosed.

Full Text

FORM 2
THE PATENTS ACT. 1970
(39 FO 1970)
&
PATENT RULES, 2003
PROVISIONAL/COMPLETE SPECIFICATION
(See section 10 and rule 13)
1.TITLE OF THE INVENTION : An Equipment and method to check current handling capacity Metallised
Plastic Film capacitor for CDI application.
2. APPLICANT(S)
(a) Name : CTR Manufacturing Industries Ltd.
(b) Nationality : Indian Company
(c) Address: E 1, Chikalthana,
(d) AURANGABAD-431210, MAHARASHTRA, INDIA
PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the invention and the manner in which it is to be
performed.

FIELD OF INVENTION
The present invention relates to check the current handling capacity of a metallised plastic film capacitor by inducing /passing desired amount of DC current through the capacitor. More particularly it relates to an equipment to simulate the field condition for CDI application of automobile. It also relates to method of manufacturing a capacitor which includes charge/discharge as one of the step to achieve desired characteristics of the metallised plastic film capacitor for CDI application.
PRIOR ART :
The self healing property and current handling capacity of the metallised plastic film capacitor offers a distinct advantage over the film foil capacitors. These properties depends upon the contact/adhesion between metal coating on the plastic film and the metal sprayed on both sides of capacitor element to form the two contact metal plates of the plastic film capacitor and result of the extreme thinness of the metallised electrode material. If the contact is weak then a contact resistance is formed. When current passes through this contact resistance, heat is generated resulting in shrinkage of metallised plastic film and not withstanding the required current. Wherever improvement in performance, withstanding current carrying capacity and avoidance of premature failure of a metallised plastic film capacitor charging/discharging is a must ie.e simulation of field condition for CDI explication..

The absence of Charge/Discharge test while manufacturing leads to:
1. Loose contact
2. Arcing
3. End spray metal on body which will reduce Insulation Resistance
4. Short circuit of capacitor
5. hjratic tan delta readings
6. More power loss across the capacitor leading to heating of capacitor
7. More capacitance loss leading to reduce life span of capacitor and CDI unit.
The above mentioned method of prior art discusses only the disadvantages such as premature failure, enatic change in tan delta, loss of power and electrical characteristics.
Thus the above mentioned method for testing current handling capacity of a metallised plastic film capacitor along with aforementioned disadvantages associated with them makes it necessary to provide a system/ equipment/device which will overcome the above drawbacks of the prior art and confirm specified current handling capacity of a metallised plastic film capacitor successfully.
OBJECTIVE OF THE INVENTION :
The main objective of the present invention is to provide an equipment, which eliminates the above said drawbacks associated with the prior equipment and method for providing charge/discharge of metallised film capacitor.

Another objective of the present invention is to provide an equipment of charge/discharge of a metallised plastic film capacitor by applying DC current to confirm current handling capacity and to improve electrical characteristics
Yet another objective of the present invention is to provide an improved foolproof equipment and method for charge/discharge system for metallised plastic film capacitor resulting in prevention of premature failures.
Yet another objective of the present invention is to provide and equipment an method for current handling apacity of a capacitor due to, end spray metal and termination contact.
Yet another objective of the present invention is to check erratic change in tan delta readings, power loss across the plastic film capacitor.
Yet -.mother objective of the present invention is to check current handling capacity and enhance the life of a plastic film capacitor, improve reliability through better electrical characteristics of a metallised plastic film capacitor.
Yet another objective of the present invention is to provide an equipment and method for current handling capacity of a plastic film capacitor which is economical and having simple operation.

STATEMENT OF THE INVENTION :
Accordingly in order to achieve the above mentioned objects, there is provided an equipment to provide
charge/discharge test of a metallised plastic film capacitor, the said equipment comprises :
.an DC power supply unit for generating 0 to 400V variable DC voltage;
.Control unit for providing a desired number of charge/discharge cycles required for the test, said control unit
comprises :
? a two digit thumb wheel switch which counts time for charge/discharge test and allows desired number o\' cycles at the output, settable from 1sec to 99minutes;
? a flip-flop having "'SET" and "RESET" terminals, to start and reset the timer;

? count over output is connected to reset terminal of the flip flop through the second monostable multivibrator to stop and reset the counter.
? Solid state switch to ensure that only fixed number of pulses being decided by the control unit to be given to output unit, input of said solid state switch is connected to the output of the flip-flop:
Output unit to provide an amplitude controlled DC voltage for charge/discharge test for charging the capacitor, le discharge resistance is selectable and its connections are provided on the rear panel of the equipment, said output unit is connected to and controlled by said control unit, said output unit consists of variable transformer unit for providing variable amplitude DC voltage; and
AC to DC converter/rectifier being connected to AC supply unit for providing DC1 power supply to said control unit and output unit. The equipment has five station facility to test capacitors.

Also there is provided a method of manufacturing a metallised plastic film capacitor with frequency clearing as one of the step, said method comprising steps of
a placing in a vacuum a plastic dielectric film and depositing a thin layer of metal alloy as an electrodes on it;
b. Winding a metallised film into a cylinder so that a metallised edge extends on each end of the wound
capacitor coil;
c. Spraying both ends with small droplets of molten metal that adhere along and make contact with the
metallisation on the film;
d. Soldering /welding the wire lead to this end sprayed metallised portion for making termination contact;
e. Applying amplitude controlled DC voltage for charging the capacitor and discharging through resistor 50
times in one second and continue for desired time period, thereby checking current handling capacity of
the plastic film capacitor; and
f Encapsulating and sealing said capacitor coil obtained in step (e). BRIEF DESCRIPTION OF THE DRAWINGS :
Figure 1 : Shows the wave forms of a voltage across the capacitor available in prior art.
Figure 2 : Shows block diagram of an equipment to provide charge/discharge test on metallised plastic film
capacitor at a frequency of 50Hz in accordance to present invention.
Figure 3 : Shows the wave form of a voltage across the capacitor in accordance to the present invention. Figure 4 : Shows wound capacitor coil
Figure 5 : Shows cross sectional area of wound capacitor coil
Figure 6 : Shows wound capacitor coil with end spray metallisation
Figure 7 : Shows capacitor coil with end spray metallisation and termination welded
Figure 8 : Shows wound capacitor coil with charge/discharge test
Figure 9 : Shows process flow chart for the said invented process

DETAIL DESCRIPTION OF THE INVENTION :
The above, and the other objects, features and advantages of invention will become apparent from following description read in conjunction with the accompanying drawings.
Now referring to figure 2 and equipment to provide charge/discharge test of metallised plastic film capacitor in accordance to present invention is shown. Basically the equipment provides and amplitude controlled DC voltage for charging the capacitor and discharging it through selected resistor for the purpose of checking current handling capacity. The equipment comprises :
a two digit thumb wheel switch which counts time for charge/discharge test and allows desired number of
cycles at the output, settable from 1sec to 99minutes;
? a flip-flop having "SET' and "RESET' terminals, to start and reset the timer;
? count over output is connected to reset terminal of the flip flop through the second monostable multivibrator to stop and reset the counter.
? Solid state switch to ensure that only fixed number of pulses being decided by the control unit to be given to output unit, input of said solid state switch is connected to the output of the flip-flop;
itput unit to provide an amplitude controlled DC voltage for charge/discharge test for charging the capacitor, the discharge resistance is selectable and its connections are provided on the rear panel of the equipment, said output unit is connected to and controlled by said control unit, said output unit consists of variable transformer unit for providing variable amplitude DC voltage; and
AC to DC converter/rectifier being connected to AC supply unit for providing DC power supply to said control unit and output unit. The equipment has five station facility to test capacitors.
All these above mentioned steps are shown in flowchart form in figure 9.

INDUSTRIAL APPLICABILITY:
The equipment and method to charge/discharge test of a metallised plastic film capacitor in accordance to present invention applies DC voltage for charging the capacitor and discharging it through selected resistor thereby checking its current handling capacity, and improves electrical characteristics like high voltage withstanding, tan delta improvement and also performance of capacitor during operation. The metallised plastic film capacitor obtained by the equipment and method of the present invention is useful in electronic, automobile as well as electrical industries. It is useful in various electronic and electrical circuits where high current carrying capacity as well as better performance of the plastic film capacitor is required.
The present invention is not limited to the above described embodiments, and various alterations, modifications, and/ or alternative applications of the invention may be possible, if desired, without departing from the scope and spirit of the invention, which can be read from the claims and the entire specification. All these possible alterations, modifications, and / or alternative applications of the invention are also intended to be within technical scope of the present invention.

WE CLAIM :
1. An equipment to provide charge/discharge test of a metallised film capacitor, said equipment comprises :
? a two digit thumb wheel switch which counts time for charge/discharge test and allows desired number of cycles at the output, settable from 1sec to 99minutes;
? a flip-flop having "SET' and "RESET' terminals, to start and reset the timer;

? count over output is connected to reset terminal of the flip flop through the second monostable multivibrator to stop and reset the counter.
? Solid state switch to ensure that only fixed number of pulses being decided by the control unit to be given to output unit, input of said solid state switch is connected to the output of the flip-flop;
Output unit to provide an amplitude controlled DC voltage for charge/discharge test for charging the capacitor, the discharge resistance is selectable and its connections are provided on the rear panel of the equipment, said output unit is connected to and controlled by said control unit, said output unit consists of variable transformer unit for providing variable amplitude DC voltage; and
AC to DC converter/rectifier being connected to AC supply unit for providing DC power supply to said control it and output unit. The equipment has five station facility to test capacitors.

2. An equipment to provide charge/discharge test of metallised plastic film capacitor as claimed in claim1
wherein said variable transformer unit is powered by AC power supply unit.
3. An equipment to provide charge/discharge test of metallised plastic film capacitor as claimed in claim 1, where the said output unit and control unit are connected to each other through thyristor.
4. A method of manufacturing manufacturing a metallised plastic film capacitor with frequency clearing as one of the steps, said the method comprising steps of:
a placing in a vacuum a plastic dielectric film and depositing a thin layer of metal alloy as an electrodes on it;
b. Winding a metallised film into a cylinder so that a metallised edge extends on each end of the
wound capacitor coil;
c. Spraying both ends with small droplets of molten metal that adhere along and make contact with
the metallisation on the film;
d. Soldering /welding the wire lead to this end sprayed metallised portion for making termination
contact;
e. Applying amplitude controlled Direct Current (DC) voltage to the capacitor and discharging it
through selected resistor, thereby checking current handling capacity and metal spray and
termination contact.; and
f. Encapsulating and sealing said capacitor coil obtained in step (e).

5. An equipment to provide charge/discharge test of metallised plastic film capacitor as herein described and illustrated with reference to accompanying drawings.
6. A method of manufacturing a metallised plastic film capacitor with charge/discharge test as one of the step as herein described and illustrated with reference to accompanying drawings.

ABSTRACT
The present invention relates to the charge/discharge test of a metallised plastic film capacitor by applying Direct Current (DC) voltage and discharging it through the selected resistor. The equipment comprises : an AC power supply unit, control unit, output unit and Alternating Current (AC) to Direct Current (DC) converter. An AC power supply unit generates 0 to 230 V variable AC power being converted to 400VDC variable as per the requirement of voltage. The control unit provides a fixed number of charge/discharge cycles for the test operation, The control unit comprises : two digit thumb wheel switch to set desired time for charge/discharge; and allows desired number of charge/discharge cycles pulses at the output, settable from 1 to 99; a flip-flop having "SET' and "RESET" terminals, to start and reset the timer; a pair of monostable multivibrator for providing square wave pulse outputs for setting and resetting the flip flop; foot switch is connected to "SET" terminal of the flip flop through one monostable multivibrator to start the counter; count over output is connected to reset terminal of the flip flop through the second monostable multivibrator to stop and reset the counter; solid state switch to ensure that only fixed number of pulses being decided by the control unit to be given to output unit. The output unit provides an amplitude controlled DC voltage to the capacitor for charging purpose, said output unit is connected to control unit, said output unit consists of variable transformer unit for providing variable amplitude DC voltage. The AC to DC converter is connected to AC power supply unit for providing DC power supply to control unit and output unit. Also a method of manufacturing a metallised plastic film capacitor with frequency clearing as one of the step is disclosed.

Documents:

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Patent Number

269393

Indian Patent Application Number

2340/MUM/2007

PG Journal Number

44/2015

Publication Date

30-Oct-2015

Grant Date

19-Oct-2015

Date of Filing

28-Nov-2007

Name of Patentee

CTR MANUFACTURING INDUSTRIES LTD.

Applicant Address

E1, CHIKALTHANA, AURANGABAD

Inventors:

#	Inventor's Name	Inventor's Address
1	ANIL RAGHUNATH RANE	CTR MANUFACTURING INDUSTRIES LTD. E1, CHIKALTHANA, AURANGABAD-431006

PCT International Classification Number

C08J5/18,B29C55/12

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1			NA