CLIAMS:1. A control circuit for controlling electrical supply to a motor for controlled braking of the motor, the control circuit comprising:
a first capacitor (C1) that is charged while a first relay (R1B) that enables rotation of the motor in a first direction is energized, wherein when the motor is to be instantly stopped, a second relay (R2B) is energized while the first capacitor (C1) is discharged to enable the motor to rotate in a second direction and thereby coming to a standstill.
2. The control circuit of claim 1, wherein while the first capacitor (C1) is being charged, a third relay (R1A) is also energized, and while the first capacitor (C1) is being discharged, a fourth relay (R2A) is also energized.
3. The control circuit of claim 2, wherein the control circuit further comprises a second capacitor (C2) that is charged while the second relay (R2B) that enables rotation of the motor in the second direction is energized, wherein when the motor is to be instantly stopped, the first relay (R1B) is energized while the second capacitor (C2) is discharged to enable the motor to rotate in a second direction and thereby coming to a standstill.
4. The control circuit of claim 3, wherein while the second capacitor (C2) is being charged, the fourth relay (R2A) is also energized, and while the second capacitor (C2) is being discharged, the third relay (R1A) is also energized.
5. The control circuit of claim 1, wherein the first direction is clockwise direction and second direction is anti-clockwise direction.
6. The control circuit of claim 1, wherein the first relay (R1B) and the third relay (R1A) are energized through a first diode (D1), normally closed (NC) contact of a first resistor (R5), and normally open (NO) contact of the first relay (R1B), wherein the NO contact of the first relay (R1B) is closed while the first relay (R1B) is being energized.
7. The control circuit of claim 1, wherein the second relay (R2B) and the fourth relay (R2A) are energized through a second diode (D2), a normally closed (NC) contact of a second resistor (R4), and a normally open (NO) contact of the second relay (R2B), wherein the NO contact of the second relay (R1B) is closed while the second relay (R2B) is being energized.
8. The control circuit of claim 1, wherein the control circuit forms part of an electrically operating mechanism (EOM) for a changeover switch.
9. A method for controlling electrical supply to a motor for controlled braking of the motor, the method comprising the steps of:
charging a first capacitor (C1) while energizing a first relay (R1B) that enables rotation of the motor in a first direction; and
when the motor is to be instantly stopped, discharging the first capacitor (C1) while energizing a second relay (R2B) that enables the motor to rotate in a second direction and thereby coming to a standstill.
10. The method of claim 9, further comprising the steps of:
charging a second capacitor (C2) while energizing the second relay (R2B) that enables rotation of the motor in the second direction; and
when the motor is to be instantly stopped, discharging the second capacitor (C2) while energizing the first relay (R1B) that enables the motor to rotate in the first direction and thereby coming to a standstill.
,TagSPECI:TECHNICAL FIELD
[0001] The present disclosure relates to a control circuit for controlling electrical supply. More particularly, but in an exemplary aspect, the present disclosure relates to a control circuit of an electrically operating mechanism (EOM) for changeover switches where the control circuit is used for controlling electrical supply to control rotation/movement of motor.

BACKGROUND
[0002] Background description includes information that may be useful in understanding the present invention. It is not an admission that any of the information provided herein is prior art or relevant to the presently claimed invention, or that any publication specifically or implicitly referenced is prior art
[0003] Changeover switches (CO-SD) are widely used for switching between primary and backup power sources, wherein these switches typically include 2 Switch-Disconnectors (SD) that are connected back-to-back. Changeover switches typically have three stable positions, namely ON1, OFF, ON2, wherein an electrically operating mechanism (EOM) is used to operate the changeover switches using electrical power, providing ease of operation to the user. EOM drives the shaft of the changeover switch through a gear train that is powered by a motor as the input, wherein electrical supply to the EOM is to be controlled so that it does not drive the changeover switch after the stable position is reached.
[0004] Existing control circuits do not incorporate a braking circuit (plugging) to enable accurate control of output rotation of the motor, which can eventually lead of proper functioning/rotation of the shaft/switch. As existing systems do not have braking inbuilt in their control circuit, accurate position control is not established using the existing control circuits. This can lead to the inertial energy of the motor tending to drive the output beyond the intended position. In systems with braking facility, plugging type braking is achieved either manually by the operator who uses a switch to reverse the supply or by use of timer and electronic components to achieve it automatically, making the architecture/circuit complex and rigid. Presence of electronic components in the control circuit of the EOM makes the design more complex and prone to satisfy additional requirements such as EMI, EMC. Electronic circuits require a stable power supply and are highly sensitive to fluctuations and they also require a lot of protective circuitry for the components used, which increases the cost involved.
[0005] There is therefore a need in the art for an improved control circuit for an EOM that provides more stable position control at the output for a wider range of applications.
[0006] All publications herein are incorporated by reference to the same extent as if each individual publication or patent application were specifically and individually indicated to be incorporated by reference. Where a definition or use of a term in an incorporated reference is inconsistent or contrary to the definition of that term provided herein, the definition of that term provided herein applies and the definition of that term in the reference does not apply.
[0007] In some embodiments, the numbers expressing quantities of ingredients, properties such as concentration, reaction conditions, and so forth, used to describe and claim certain embodiments of the invention are to be understood as being modified in some instances by the term “about.” Accordingly, in some embodiments, the numerical parameters set forth in the written description and attached claims are approximations that can vary depending upon the desired properties sought to be obtained by a particular embodiment. In some embodiments, the numerical parameters should be construed in light of the number of reported significant digits and by applying ordinary rounding techniques. Notwithstanding that the numerical ranges and parameters setting forth the broad scope of some embodiments of the invention are approximations, the numerical values set forth in the specific examples are reported as precisely as practicable. The numerical values presented in some embodiments of the invention may contain certain errors necessarily resulting from the standard deviation found in their respective testing measurements.
[0008] As used in the description herein and throughout the claims that follow, the meaning of “a,” “an,” and “the” includes plural reference unless the context clearly dictates otherwise. Also, as used in the description herein, the meaning of “in” includes “in” and “on” unless the context clearly dictates otherwise.
[0009] The recitation of ranges of values herein is merely intended to serve as a shorthand method of referring individually to each separate value falling within the range. Unless otherwise indicated herein, each individual value is incorporated into the specification as if it were individually recited herein. All methods described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The use of any and all examples, or exemplary language (e.g. “such as”) provided with respect to certain embodiments herein is intended merely to better illuminate the invention and does not pose a limitation on the scope of the invention otherwise claimed. No language in the specification should be construed as indicating any non-claimed element essential to the practice of the invention.
[0010] Groupings of alternative elements or embodiments of the invention disclosed herein are not to be construed as limitations. Each group member can be referred to and claimed individually or in any combination with other members of the group or other elements found herein. One or more members of a group can be included in, or deleted from, a group for reasons of convenience and/or patentability. When any such inclusion or deletion occurs, the specification is herein deemed to contain the group as modified thus fulfilling the written description of all Markush groups used in the appended claims.

OBJECTS OF THE INVENTION
[0011] It is an object of the present disclosure to provide an improved control circuit for an EOM that provides more stable position control at the output for a wider range of applications
[0012] It is an object of the present disclosure to provide an improved control circuit that incorporates/integrates a braking circuit for accurate control of output rotation.
[0013] It is an object of the present disclosure to provide an improved control circuit that enables a flexible design that can adapt to varied braking or reversal requirements.
[0014] It is an object of the present disclosure to provide an improved control circuit that reduces chances of failure.
[0015] It is an object of the present disclosure to provide an improved control circuit having a capacitor that acts as a timer and can be extended to any area short pulse of control.

SUMMARY
[0016] The present disclosure relates to a control circuit for controlling electrical supply. More particularly, but in an exemplary aspect, the present disclosure relates to a control circuit of an electrically operating mechanism (EOM) for changeover switches where the control circuit is used for controlling electrical supply to control rotation/movement of motor.
[0017] According to one embodiment, the present disclosure relates to a control circuit for controlling electrical supply to a motor for controlled braking of the motor, wherein the control circuit includes a first capacitor (C1) that is charged while a first relay (R1B) that enables rotation of the motor in a first direction is energized, wherein when the motor is to be instantly stopped, a second relay (R2B) is energized while the first capacitor (C1) is discharged to enable the motor to rotate in a second direction and thereby coming to a standstill.
[0018] In an aspect, while the first capacitor (C1) is being charged, a third relay (R1A) is also energized, and while the first capacitor (C1) is being discharged, a fourth relay (R2A) is also energized.
[0019] In yet another aspect, the control circuit can further include a second capacitor (C2) that is charged while the second relay (R2B) that enables rotation of the motor in the second direction is energized, wherein when the motor is to be instantly stopped, the first relay (R1B) is energized while the second capacitor (C2) is discharged to enable the motor to rotate in a second direction and thereby coming to a standstill. In an aspect, while the second capacitor (C2) is being charged, the fourth relay (R2A) is also energized, and while the second capacitor (C2) is being discharged, the third relay (R1A) is also energized.
[0020] In another aspect, the first direction is clockwise direction and the second direction is anti-clockwise direction.
[0021] According to one embodiment, the first relay (R1B) and the third relay (R1A) can be energized through a first diode (D1), a normally closed (NC) contact of a first resistor (R5), and a normally open (NO) contact of the first relay (R1B), wherein the NO contact of the first relay (R1B) is closed while the first relay (R1B) is being energized. Similarly, the second relay (R2B) and the fourth relay (R2A) can be energized through a second diode (D2), a normally closed (NC) contact of a second resistor (R4), and a normally open (NO) contact of the second relay (R2B), wherein the NO contact of the second relay (R1B) is closed while the second relay (R2B) is being energized.
[0022] According to another embodiment, the control circuit forms part of an electrically operating mechanism (EOM) for a changeover switch.
[0023] The present disclosure further relates to a method for controlling electrical supply to a motor for controlled braking of the motor, the method including the steps of charging a first capacitor (C1) while energizing a first relay (R1B) that enables rotation of the motor in a first direction; and when the motor is to be instantly stopped, discharging the first capacitor (C1) while energizing a second relay (R2B) that enables the motor to rotate in a second direction and thereby coming to a standstill. The method can further include the steps of charging a second capacitor (C2) while energizing the second relay (R2B) that enables rotation of the motor in the second direction; and when the motor is to be instantly stopped, discharging the second capacitor (C2) while energizing the first relay (R1B) that enables the motor to rotate in the first direction and thereby coming to a standstill.
[0024] Various objects, features, aspects and advantages of the inventive subject matter will become more apparent from the following detailed description of preferred embodiments, along with the accompanying drawing figures in which like numerals represent like components

BRIEF DESCRIPTION OF THE DRAWINGS
[0025] The accompanying drawings are included to provide a further understanding of the present disclosure, and are incorporated in and constitute a part of this specification. The drawings illustrate exemplary embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.
[0026] FIG. 1 illustrates a schematic representation of the complete control circuit in accordance with an embodiment of the present disclosure.
[0027] FIG. 2 highlights additional circuitry from the shown complete control circuit wherein the additional circuitry controls plugging type braking in accordance with an embodiment of the present disclosure.
[0028] FIG. 3 illustrates a schematic representation showing charging of first capacitor in accordance with an embodiment of the present disclosure.
[0029] FIG. 4 illustrates a schematic representation showing discharging of first capacitor in accordance with an embodiment of the present disclosure.
[0030] FIG. 5 illustrates a schematic representation showing charging of second capacitor in accordance with an embodiment of the present disclosure.
[0031] FIG. 6 illustrates a schematic representation showing discharging of second capacitor in accordance with an embodiment of the present disclosure.

DETAILED DESCRIPTION
[0032] The following is a detailed description of embodiments of the disclosure depicted in the accompanying drawings. The embodiments are in such detail as to clearly communicate the disclosure. However, the amount of detail offered is not intended to limit the anticipated variations of embodiments; on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the present disclosure as defined by the appended claims.
[0033] Each of the appended claims defines a separate invention, which for infringement purposes is recognized as including equivalents to the various elements or limitations specified in the claims. Depending on the context, all references below to the "invention" may in some cases refer to certain specific embodiments only. In other cases it will be recognized that references to the "invention" will refer to subject matter recited in one or more, but not necessarily all, of the claims.
[0034] As used in the description herein and throughout the claims that follow, the meaning of “a,” “an,” and “the” includes plural reference unless the context clearly dictates otherwise. Also, as used in the description herein, the meaning of “in” includes “in” and “on” unless the context clearly dictates otherwise.
[0035] All methods described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The use of any and all examples, or exemplary language (e.g. “such as”) provided with respect to certain embodiments herein is intended merely to better illuminate the invention and does not pose a limitation on the scope of the invention otherwise claimed. No language in the specification should be construed as indicating any non-claimed element essential to the practice of the invention.
[0036] Various terms as used herein are shown below. To the extent a term used in a claim is not defined below, it should be given the broadest definition persons in the pertinent art have given that term as reflected in printed publications and issued patents at the time of filing.
[0037] The present disclosure relates to a control circuit for controlling electrical supply. More particularly, but in an exemplary aspect, the present disclosure relates to a control circuit of an electrically operating mechanism (EOM) for changeover switches where the control circuit is used for controlling electrical supply to control rotation/movement of motor.
[0038] According to one embodiment, the present disclosure relates to a control circuit for controlling electrical supply to a motor for controlled braking of the motor, wherein the control circuit includes a first capacitor (C1) that is charged while a first relay (R1B) that enables rotation of the motor in a first direction is energized, wherein when the motor is to be instantly stopped, a second relay (R2B) is energized while the first capacitor (C1) is discharged to enable the motor to rotate in a second direction and thereby coming to a standstill.
[0039] In an aspect, while the first capacitor (C1) is being charged, a third relay (R1A) is also energized, and while the first capacitor (C1) is being discharged, a fourth relay (R2A) is also energized.
[0040] In yet another aspect, the control circuit can further include a second capacitor (C2) that is charged while the second relay (R2B) that enables rotation of the motor in the second direction is energized, wherein when the motor is to be instantly stopped, the first relay (R1B) is energized while the second capacitor (C2) is discharged to enable the motor to rotate in a second direction and thereby coming to a standstill. In an aspect, while the second capacitor (C2) is being charged, the fourth relay (R2A) is also energized, and while the second capacitor (C2) is being discharged, the third relay (R1A) is also energized.
[0041] In another aspect, the first direction is clockwise direction and the second direction is anti-clockwise direction.
[0042] According to one embodiment, the first relay (R1B) and the third relay (R1A) can be energized through a first diode (D1), a normally closed (NC) contact of a first resistor (R5), and a normally open (NO) contact of the first relay (R1B), wherein the NO contact of the first relay (R1B) is closed while the first relay (R1B) is being energized. Similarly, the second relay (R2B) and the fourth relay (R2A) can be energized through a second diode (D2), a normally closed (NC) contact of a second resistor (R4), and a normally open (NO) contact of the second relay (R2B), wherein the NO contact of the second relay (R1B) is closed while the second relay (R2B) is being energized.
[0043] According to another embodiment, the control circuit forms part of an electrically operating mechanism (EOM) for a changeover switch.
[0044] The present disclosure further relates to a method for controlling electrical supply to a motor for controlled braking of the motor, the method including the steps of charging a first capacitor (C1) while energizing a first relay (R1B) that enables rotation of the motor in a first direction; and when the motor is to be instantly stopped, discharging the first capacitor (C1) while energizing a second relay (R2B) that enables the motor to rotate in a second direction and thereby coming to a standstill. The method can further include the steps of charging a second capacitor (C2) while energizing the second relay (R2B) that enables rotation of the motor in the second direction; and when the motor is to be instantly stopped, discharging the second capacitor (C2) while energizing the first relay (R1B) that enables the motor to rotate in the first direction and thereby coming to a standstill.
[0045] The present disclosure relates to, but not limited to, an improved control circuit used in Electrically Operating mechanism (EOM) for Changeover Switch, wherein, in an embodiment, the improvement incorporates a braking circuit (plugging) that is integrated into existing/basic control circuit for accurate control of output rotation, which provides more stable position control at the output for a wider range of applications. Furthermore, control circuit of the present disclosure only includes electrical components i.e. electromagnetic relays to control the switching & capacitors to act as a timer. This avoids the need for additional electronic components to regulate the input supply.
[0046] Definitions:
[0047] EOM (Electrically operated mechanism): provides electrical power that is used to operate the changeover switch.
[0048] Microswitch: Includes one or more small sized switches with contacts that can be closed/opened through an actuating lever/projection.
[0049] Normally Open (NO) contacts: include contacts that are open when the Micro switch is not actuated mechanically and are closed when actuated. Similar contacts are present in Electromagnetic relays that get actuated electrically.
[0050] Normally Closed (NC) contacts: include contacts that are closed when the Micro switch is not actuated mechanically and are open when actuated. Similar contacts are present in Electromagnetic relays that get actuated electrically.
[0051] Electro-mechanical relays: include relays that have a set of contacts that open/close in response to excitation of a control coil integrated into the same assembly.
[0052] Capacitor: is a passive two-terminal electrical component that is used to store energy electrostatically in an electric field.
[0053] Plugging: is a type of braking where the terminals of supply to the motor are reversed so that a counter torque is generated that resists normal rotation of the motor, thereby decreasing the speed of motor. The counter torque should be maintained only for the duration sufficient to bring the motor to rest.
[0054] According to one embodiment, control circuit of the present disclosure can include a set of electro-mechanical relays, and an actuator mechanism with a set of micro switches that are arranged in a predefined logical sequence to enable rotation of the motor in the desired direction of movement till the desired position is reached. In another embodiment, plugging arrangement of the present disclosure employs a capacitor to act as a timer along with interlocks by use of relay contacts to charge the capacitor and discharge it in the intended path.
[0055] In an aspect of the present disclosure, braking of the motor, which is essential to overcome inertial effect of a fast running motor, can be achieved electrically through a simple electromechanical relay based circuit, wherein the circuit also permits use of the principle over varied applications by providing flexibility of adoption. Time duration and/or the amount of braking required can be controllable, and hence can be applied over a variety of such applications.
[0056] According to one embodiment, the present disclosure includes a control circuit that is used to control electrical supply to the motor of the EOM for changeover switch. The proposed control circuit incorporates one or more relays, diodes, and capacitors to provide plugging type braking. Configuration and working of the proposed control circuit would now be explained with reference to FIGs. 1-6.
[0057] According to one embodiment, FIG. 1 illustrates a schematic representation of the complete control circuit 100 in accordance with an embodiment of the present disclosure. In an exemplary implementation, when relay R1B is energized, the motor rotates in a first direction, say the clockwise direction, and when relay R2B is energized, the motor runs in a second direction, say anti-clockwise direction. In an aspect, relays R1A and R2A form part of the control circuitry, and relays R2A and R2B form part of the power circuitry that is operatively coupled with the motor to supply/vary power to the motor/load.
[0058] FIG. 2 highlights additional circuitry 200 from the shown complete control circuit 100 wherein the additional circuitry controls plugging type braking in accordance with an embodiment of the present disclosure. The additional circuitry 200 is shown as a dotted line, wherein the additional circuitry 200 can include a first capacitor C1 and a second capacitor C2. The additional circuitry 200 can further include a first set of relays R1A and R1B for control circuitry and power circuitry respectively. The additional circuitry 200 can further include a second set of relays R2A and R2B for control circuitry and power circuitry respectively.
[0059] FIG. 3 illustrates a schematic representation 100 showing charging of first capacitor C1 in accordance with an embodiment of the present disclosure. In an exemplary implementation of the plugging/additional circuitry 200, a command can be initiated to energize the relays R1A & R1B till the operation gets completed by opening of NC-I (NC contact of Micro switch for SD-I). While the relays R1A & R1B are being energized, capacitor C1 can be charged through diode D1, NC contact of resistor R5, and NO contact of R1A (which is closed till R1A is energized). Even an AC supply can be fed since the diode D1 can act as rectifier. During this period, the motor runs in clockwise direction, and therefore, in order to make the motor stop instantly by plugging, supply can be fed to the motor such that it rotates anti-clockwise for a short period of time.
[0060] FIG. 4 illustrates a schematic representation 100 showing discharging of the first capacitor C1 in accordance with an embodiment of the present disclosure. In an implementation, at the instance when the supply to the motor for clockwise direction is cut off by the micro switch, relays R2A and R2B can be energized for a short duration to bring the motor to rest instantly (which would be performed by R2B as it is used in the power circuitry). Capacitor C1 can do so by energizing the relay R2B through the coil and NO contact of resistor R4. R2B can be energized till the capacitor C1 loses its entire energy. During this short duration where R2B is energized, the motor tries to rotate in anti-clockwise direction, thereby coming to a standstill by opposing the inertial energy of the clockwise rotation
[0061] FIG. 5 illustrates a schematic representation 100 showing charging of second capacitor C2 in accordance with an embodiment of the present disclosure. Working and implementation of the C2 is parallel to that of C1 with a mirror functionality, wherein charging of C2 can energize R2A and R2B and discharging of C2 can energize R1A and R1B. Therefore, this implementation using capacitor C2 follows the same principle as explained above but in the opposite direction in a mirrored manner. Capacitor C2 gets charged when the motor is running in anti-clockwise direction i.e. R2B relay is energized. In an exemplary implementation of the plugging/additional circuitry 200, a command can be initiated to energize the relays R2A & R2B till the operation gets completed by opening of NC-II (NC contact of Micro switch for SD-II). While the relays R2A & R2B are being energized, capacitor C2 can be charged through diode D2, NC contact of resistor R4, and NO contact of R2A (which is closed till R2A is energized).
[0062] FIG. 6 illustrates a schematic representation 100 showing discharging of second capacitor C2 in accordance with an embodiment of the present disclosure, wherein similar to the discharge of C1, discharging of C2 can take place in parallel to energizing of the relay R1B to generate a clockwise counter torque when the motor’s inertia runs in anti-clockwise direction.
[0063] In an aspect therefore, all operations needed to be performed by an EOM for changeover switch gets satisfied through this as any operation tends to be either clockwise or anti-clockwise and the respective counter torque is generated.
[0064] According to one embodiment, plugging type braking can be achieved with simple passive electrical components, wherein use of capacitor as a timer enables higher flexibility to suit varied requirement of braking. Furthermore, by means of the present disclosure, voltage variations at supply side inducing variations in inertial energy are also taken care automatically as the capacitor’s energy stored also depends on input voltage.
[0065] In another aspect, the present disclosure provides a highly flexible design that can adapt to varied braking or reversal requirements. The present disclosure further provides a simple circuitry with reduced chances of failure, and uses the capacitors (C1 and/or C2) as a timer and can be extended to any area short pulse of control.
[0066] While the foregoing describes various embodiments of the invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof. The scope of the invention is determined by the claims that follow. The invention is not limited to the described embodiments, versions or examples, which are included to enable a person having ordinary skill in the art to make and use the invention when combined with information and knowledge available to the person having ordinary skill in the art.

ADVANTAGES OF THE INVENTION
[0067] The present disclosure provides an improved control circuit for an EOM that provides more stable position control at the output for a wider range of applications
[0068] The present disclosure provides an improved control circuit that incorporates/integrates a braking circuit for accurate control of output rotation.
[0069] The present disclosure provides an improved control circuit that enables a flexible design that can adapt to varied braking or reversal requirements.
[0070] The present disclosure provides an improved control circuit that reduces chances of failure.
[0071] The present disclosure provides an improved control circuit having a capacitor that acts as a timer and can be extended to any area short pulse of control.