DESC:FORM 2

THE PATENTS ACT, 1970 (39 of 1970)
&
THE PATENT RULES, 2003

COMPLETE SPECIFICATION
(See Section 10 and Rule 13)

Title of invention:
CONTACTOR LOGIC FOR MID - FREQUENCY POWER SOURCE

Applicant:
BEML Limited
A company Incorporated in India under the Companies Act, 1956
Having address:
BEML Soudha, 23/1, 4th Main, Sampangirama Nagar,
Bengaluru - 560 027, Karnataka, India

The following specification particularly describes the invention and the manner in which it is to be performed

CROSS-REFERENCE TO RELATED APPLICATIONS AND PRIORITY
[001] The present invention claims priority from Indian patent application numbered IN 202041018094 filed on 28th April 2020.
TECHNICAL FIELD

[002] The present subject matter described herein, in general, relates to a contactor logic circuitry for mid - frequency power source.
BACKGROUND

[003] The heavy vehicles or earth moving equipments generally requires high frequency power source converter for using induction hardening of track links in order to perform operations. Due to fluctuation into supplied voltage, there is high probability of occurrence of break down condition of hardening machine because of damaging of active components.
[004] The conventional uninterruptible power supply system uses MCCB (Molded Case Circuit Breaker) and such type of power supply requires an active component such as an active switch between the main power supply or the generator and the input gate of each uninterruptible power supply system. Such active switches or components are expensive and its capacity for system has to be predetermined for assuring proper working. Further, the components cannot sustain the additional load powered by the uninterruptible power system. If an active component fails, the power system must be repaired offline, causing power system downtime.

[005] Further, the main remote power supply breaker can fail due to malfunctioning at input power supply because of the high voltage supply which may result into breakdown maintenance of hardening machine. Failure of main breaker leads to damage of active components like capacitor banks, diodes from rectifier unit and driver cards of inverter unit. Also due to breakdown of hardening machine, productivity gets affected, which results in high maintenance costs in addition on to high losses in breakdown.

[006] Hence, a protective system needs to be provided which will protect high value components of electrical system of hardening machine power source from surge voltage or malfunction.

OBJECT OF THE INVENTION

[007] It is a main object of the present invention is to provide a protection device to an electrical circuit of induction power source for hardening of high value components track links of heavy vehicle or earth moving equipments.
[008] It is an object of the present invention is to provide a protection device to an electrical circuit of induction power source for hardening of high value components track links of heavy vehicle or earth moving equipments comprising of an auxiliary contactor and main contactor
[009] It is an object of the present invention to provide a protection device by using auxiliary contactor to avoid surge voltage supply to main circuit.
SUMMARY

[010] Before the present system and method are described, it is to be understood that this application is not limited to the particular machine or an apparatus, and methodologies described, as there can be multiple possible embodiments that are not expressly illustrated in the present disclosures. It is also to be understood that the terminology used in the description is for the purpose of describing the particular versions or embodiments only, and is not intended to limit the scope of the present application. This summary is provided to introduce aspects related a contactor logic circuitry for mid - frequency power source, and the aspects are further elaborated below in the detailed description. This summary is not intended to identify essential features of the proposed subject matter nor is it intended for use in determining or limiting the scope of the proposed subject matter.
[011] The present subject matter discloses a circuitry of remote operated power breaker circuit with multi protection system using main and auxiliary contactors logic. The auxiliary contactor is activated first and afterward the main contactor is activated, in order to eliminate direct feeding of high voltage power supply to the full wave rectifier unit through main contactor to avoid breakdown of high frequency power source converter. The high frequency power supply is used to power up hardening machines.
STATEMENT OF INVENTION
[012] Accordingly, the present invention discloses a contactor logic circuitry for mid-frequency power source comprising of at least one auxiliary contactor configured to provide protection from surge voltage, at least one main contactor configured to provide power supply for operation of machine, at least one fuse configured for power supply overload protection, plurality of relays configured to be connected between the auxiliary contactor and control supply and plurality of fuses configured to be connected in series to auxiliary contactor.
[013] The main contactor is configured to be switched ON through remote operated switch after activating the auxiliary contactor. The auxiliary contactor is configured with a auxiliary coil to provide power supply to main contactor. The main contactor is configured with main contactor coil to provide power supply to the machine. The auxiliary contactor and a fuse are connected in between three phase power supply and main contactor coil as power breaker circuit with multi protection system. The auxiliary coil is configured to be connected in series with machine controller PCB. The auxiliary contactor is configured to be serially connected to parallel combined fuses and further fuses are connected to capacitor banks. The auxiliary contactor is configured to provide controlled supply to active components and to monitor their working. The active components are capacitors, choke and inverter circuit.
BRIEF DESCRIPTION OF THE DRAWINGS

[014] The foregoing summary, as well as the following detailed description of embodiments, is better understood when read in conjunction with the appended drawing. For the purpose of illustrating the disclosure, there is shown in the present document example constructions of the disclosure, however, the disclosure is not limited to the specific methods and apparatus disclosed in the document and the drawing:
[015] The detailed description is described with reference to the accompanying figure. In the figure, the left-most digit(s) of a reference number identifies the figure in which the reference number first appears. The same numbers are used throughout the drawing to refer like features and components.

[016] Figure 1 illustrates a control circuitry for a phase.
[017] Figure 2 illustrates an operation of auxiliary contactor.
[018] Figure 3 illustrates an implementation of auxiliary contactor and main contactor.
[019] The figure depicts various embodiments of the present disclosure for purposes
of illustration only. One skilled in the art will readily recognize from the following discussion that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the disclosure described herein.

DETAILED DESCRIPTION

[020] Some embodiments of this disclosure, illustrating all its features, will now be discussed in detail. The words "comprising", “having”, and "including," and other forms thereof, are intended to be equivalent in meaning and be open ended in that an item or items following any one of these words is not meant to be an exhaustive listing of such item or items, or meant to be limited to only the listed item or items. Although any systems and methods similar or equivalent to those described herein can be used in the practice or testing of embodiments of the present disclosure, the exemplary, systems and methods are now described. The disclosed embodiments are merely exemplary of the disclosure, which may be embodied in various forms.
[021] Various modifications to the embodiment will be readily apparent to those skilled in the art and the generic principles herein may be applied to other embodiments. However, one of ordinary skill in the art will readily recognize that the present disclosure is not intended to be limited to the embodiments illustrated, but is to be accorded the widest scope consistent with the principles and features described herein.
[022] The present subject matter discloses a contactor logic type mid –frequency power supply comprises a main contactor (3), a main contactor coil (3.1), a fuse (1), an auxiliary contactor (2), copper strip type bus bar, fuse 4 and 5, relay 6 and 7, a control supply. The remote operated power breaker circuit is provided for switching a main contactor remotely, wherein remote operated power breaker circuit comprises of auxiliary contactor (2), main contactor (3) and active components in order to avoid breakdown of high frequency power source converter. The control supply is supplied to active components to charging capacitors, choke, inverter circuit in order to monitor all components before activating auxiliary contactor (2). Once the auxiliary contactor (2) is activated, the system ensures protection from surge voltage. After activating the auxiliary contactor (2), the main contactor (3) gets switched on through remote operated switch in order to supply the rated controlled power supply for operations of hardening machine.
[023] Referring now to figure 1 and 3, in one aspect of present subject matter, an auxiliary contactor (2) and a fuse (1) are placed in between three phase power supply and main contactor coil (3.1) in order to act as power breaker circuit with multi protection system. After activation of auxiliary contactor (2), system ensures safety of voltages and afterwards main contactor (3) gets activated. While connecting auxiliary coil (2.1) in series with machine controller PCB, relay 6 and relay 7 connected in between auxiliary coil (2.1) and control supply
[024] Referring to figure 2, the auxiliary contactor (2) are serially connected to parallel combined fuses 4 and 5, further fuses 4 and 5 are connected to capacitor banks. After fulfilling the current and voltage conditions auxiliary contactor (2) gets activated, wherein auxiliary contactor (2) is a normally open switch or relay.
[025] A contactor logic circuitry for mid-frequency power source comprising of at least one auxiliary contactor configured to provide protection from surge voltage, at least one main contactor (3) configured to provide power supply for operation of machine, at least one fuse (1) configured for power supply overload protection, plurality of relays (6,7) configured to be connected between the auxiliary contactor (2) and control supply and plurality of fuses (4,5) configured to be connected in series to auxiliary contactor. The main contactor (3) is configured to be switched ON through remote operated switch after activating the auxiliary contactor. The auxiliary contactor (2) is configured with a auxiliary coil (2.1) to provide power supply to main contactor. The main contactor (3) is configured with main contactor coil (3.1) to provide power supply to the machine. The auxiliary contactor (2) and a fuse (1) are connected in between three phase power supply and main contactor coil (3.1) as power breaker circuit with multi protection system. The auxiliary coil (2.1) is configured to be connected in series with machine controller PCB. The auxiliary contactor (2) is configured to be serially connected to parallel combined fuses 4 and 5 and further fuses 4 and 5 are connected to capacitor banks. The auxiliary contactor (2) is configured to provide controlled supply to active components and to monitor their working. The active components are capacitors, choke and inverter circuit.
[026] Exemplary embodiments discussed above may provide certain advantages. Though not required to practice aspects of the disclosure, these advantages may include those provided by the following features.
[027] Some object of the present invention is suitable for performing smooth and safe operations of the induction hardening convertors.
[028] Some object of the present invention is suitable to provide contactor logic type of power supply to CNC track link induction hardening machine.
[029] Some object of the present invention is suitable to totally eliminated frequent failure of capacitors, choke, power diodes, driver cards.
[030] REFERRAL NUMERALS

Element Description Reference Numeral
Fuse 1
Auxiliary contactor 2
Main contactor 3
Fuse 4,5
Relay 6,7
Auxiliary contactor coil 2.1
Main contactor coil 3.1
,CLAIMS:1. A contactor logic circuitry for mid-frequency power source comprises of:
at least one auxiliary contactor (2) configured to provide protection from surge voltage;
at least one main contactor (3) configured to provide power supply for operation of machine;
at least one fuse (1) configured for power supply overload protection;
plurality of relays (6,7) configured to be connected between the auxiliary contactor (2) and control supply; and
plurality of fuses (4,5) configured to be connected in series to auxiliary contactor (2).

2. The contactor logic circuitry for mid-frequency power source as claimed in 1, wherein the said main contactor (3) is configured to be switched ON through remote operated switch after activating the auxiliary contactor (2).

3. The contactor logic circuitry for mid-frequency power source as claimed in 1, wherein the said auxiliary contactor (2) is configured with a auxiliary coil (2.1) to provide power supply to main contactor (3).

4. The contactor logic circuitry for mid-frequency power source as claimed in 1, wherein the said main contactor (3) is configured with main contactor coil (3.1) to provide power supply to the machine.

5. The contactor logic circuitry for mid-frequency power source as claimed in 1, wherein the said auxiliary contactor (2) and a fuse (1) are connected in between three phase power supply and main contactor coil (3.1) as power breaker circuit with multi protection system.

6. The contactor logic circuitry for mid-frequency power source as claimed in 1, wherein the said auxiliary coil (2.1) is configured to be connected in series with machine controller PCB.

7. The contactor logic circuitry for mid-frequency power source as claimed in 1, wherein the said auxiliary contactor (2) is configured to be serially connected to parallel combined fuses 4 and 5 and further fuses 4 and 5 are connected to capacitor banks.

8. The contactor logic circuitry for mid-frequency power source as claimed in 1, wherein the said auxiliary contactor (2) is configured to provide controlled supply to active components and to monitor their working.

9. The contactor logic circuitry for mid-frequency power source as claimed in 1, wherein the said active components are capacitors, choke and inverter circuit.