WO2023067615A1

WO2023067615A1 - Multifunctional capacitor based converter

Info

Publication number: WO2023067615A1
Application number: PCT/IN2022/050666
Authority: WO
Inventors: Shivam Chauhan; Krupa Shah
Original assignee: Shivam Chauhan; Krupa Shah
Priority date: 2021-10-22
Filing date: 2022-07-25
Publication date: 2023-04-27

Abstract

The present invention relates to a multifunctional converter comprising a capacitor-based assembly (400) to be eclectically coupled between a primary source (100) and a load (600); an input filter (300) coupled at a voltage input terminal; and an output filter (500) coupled at a voltage output terminal. The capacitor based assembly (400) comprises a first capacitor bank (CB1) connected with a second capacitor bank (CB2) in a parallel electrical circuit; four semiconductor switches (S1, S2, S3, S4) operatively coupled in the electrical circuit to allow charging and discharging of the capacitor banks (CB1, CB2); a microcontroller (402) adapted to control operation of the switches (S1, S2, S3, S4) according to capacity of the primary source (100); and an isolating diode (D5) coupled between the input filter (300) and the capacitor banks (CB1, CB2). Further, the capacitor banks (CB1, CB2) may be replaced with super capacitors or ultra-capacitors.

Description

MULTIFUNCTIONAL CAPACITOR BASED CONVERTER

FIELD OF THE INVENTION

The present invention relates to a multifunctional/multipurpose converter (used in the electrical field). More particularly, the present invention relates to a capacitor/super- capacitor/ultra capacitor based converter to be used between a primary power source and a battery/load. The converter may act as a secondary power source and is capable of charging/operating the battery/load in an automatic controlled way; thus providing uninterrupted/continuous/desired power supply from the primary source to the battery/load while maintaining isolation therebetween so as to protect the load as well as the source.

BACKGROUND OF THE INVENTION

Electrical isolation is necessary to protect circuits, equipment (source/load), and people from shocks and short circuits. At the same time, while charging a battery or operating a load, an uninterrupted/continuous power with constant current and constant voltage (i.e. reduced voltage fluctuation or improved voltage regulation) is required to be supplied from the source to the battery/load so as to improve the battery/load life.

With the advancement of technology in the field of energy, energy utilization, generation and conservation, the researchers are focusing how to maximize the usage of renewable energy sources like solar power, wind power generation. The electricity produced by these sources can be directly transmitted to the load or stored in rechargeable batteries for future use. However, the voltage generated by these sources are uneven or fluctuated so it hampers the recharging efficiency and causes various electrical issues including but not limited to overcharging, damaging the battery/load and the source hardware. To regulate the voltage and current flow, various types of converters are used. Although, these converters have some sort of voltage regulation and protection mechanism which are quite useful while charging the battery or running any load directly.

A reference may be made to US10965208B2 that discloses a Bidirectional Multimode Power Converter which employs a high frequency dynamically varying amplitude modulation and voltage steering-method to convert the source AC or DC voltages to output AC or DC voltages with programmable output voltage levels, output voltage frequency and duration. In the power amplitude modulation module, a Capacitor two Inductors are connected together in series and they are connected with the inductances of a Transformer to form the LLC resonant circuit. The Electric vehicle's motor could be supplied with AC form DC battery bank and the freewheeling energy from the windings can be stared in a capacitor banks. The energy stored in the capacitor bank could be used to supply instantaneous additional energy needed for uphill driving. Similarly, the energy could be stored in the capacitor bank and the battery can be charged from the capacitor banks.

Another reference may be made to US8847564B2 that discloses a DC/DC voltage converter comprising an inductor and a low-side switch connected in series between a supply voltage and a circuit ground; a synchronous rectifier MOSFET connected between the node and an output terminal of the converter, a freewheeling MOSFET connected in parallel with the inductor; a break-before-make buffer; a first adaptive; a pulse-width modulation controller connected to an input terminal of the break-before-make buffer. Here a capacitor is connected between the output terminal and the circuit ground.

One more reference may be made to US10103644B2 that discloses an AC-to-DC converter in which the input inductor in parallel electrical communication with the first resonant capacitor and the second resonant capacitor is in parallel communication with a first MOSFET and an output diode.

A further reference may be made to US6838923B2 that discloses an ultracapacitor based power storage device suitable for use in hybrid fuel cell systems and other power systems includes circuitry for simulating the response of a battery. The electrical circuit comprises a number of ultracapacitors electrically coupled in series; a charging current limiter electrically coupled in series with the ultracapacitors; and a bypass element electrically coupled across the charging current limiter. Particularly, the device aims to provide different level of voltage as well as current according to the load requirement, whereas for power up, the fuel cell and ultra-capacitors are used.

Another reference may be made to US8035356B2 that discloses backup power supplies to a coupled electrical device using one or more ultra-capacitors along with a multiphase boost converter that allows the uninterruptible power supply to provide a generally constant voltage level from the one or more ultra capacitors. The device is basically one kind of UPS in which ultra-capacitors are used instead of battery. It has a limitation that once stored power is finished it will not work, thus there is no continuous power supply. However, all existing capacitor/super/ultra capacitor based converters/charger/power backup technologies have reached their limitations. Therefore, a need arises to provide a proper isolation mechanism configured with a current/voltage regulation tool which can improve way of energy storage, provide constant current and constant voltage, and give protection against the overcharging like issues, thus improving battery /load life.

Therefore, in view of the above limitations of the conventional/existing approaches, techniques, device and methods, there exists a need to develop an improved approach, device/system and method which would in turn address a variety of issues including, but not limited to, optimal energy storage, overcharging, voltage fluctuation, interrupted power flow, thereby supplying uninterrupted/continuous power to battery/load and protecting both source and load though a capacitor/super/ultra capacitor based isolation converter in more simple and cost-effective manner. Moreover, it is desired to develop a technically advanced apparatus/device/system and method for supplying uninterrupted/continuous power to battery/load and protecting both source and load, which includes all the advantages of the conventional/existing techniques/methodologies and overcomes the deficiencies of such techniques/methodologies.

OBJECT OF THE INVENTION

It is an object of the present invention to provide a multifunctional/multipurpose converter which is capable of providing uninterrupted/continuous/desired power supply from the primary source to the battery/load while maintaining isolation; thus protecting both source and battery/load against various electrical issues such as overcharging, current/voltage fluctuation.

It is another object of the present invention to provide an isolator cum charger cum energy extractor which is able to efficiently store the renewable power source in an improved way for future use.

It is a further object of the present invention to provide a capacitor/super-capacitor/ultra capacitor based converter assembly which can be used as a battery charger or an isolator cum energy extractor between the primary source and the battery/load.

SUMMARY OF THE INVENTION In one aspect, the present invention provides a multifunctional/multipurpose converter, comprising: a capacitor/ supper-capacitor based assembly to be eclectically coupled between a primary source and a load; an input filter coupled at a voltage input terminal of the capacitor based assembly; and an output filter coupled at a voltage output terminal of the capacitor based assembly. More particularly, the capacitor/super capacitor based assembly comprises a first capacitor bank connected with a second capacitor bank in a parallel electrical circuit; four semiconductor switches (first, second, third, fourth) operatively coupled in the electrical circuit to allow charging and discharging of the capacitor/super capacitor banks; a microcontroller adapted to control operation of the switches according to availability of the primary source and power generation/requirement thereat; and an isolating diode coupled between the input filter and the capacitor banks. The microcontroller is configured to close the first and fourth switches, and to open the second and third switches at same time; thereby enabling the first capacitor bank to get charged, and the second capacitor bank to get discharged simultaneously. Further, the microcontroller is configured to close the second and third switches, and to open the first and fourth switches at same time; thereby enabling the second capacitor bank to get charged, and the first capacitor bank to get discharged. Furthermore, the microcontroller is configured to close the four switches simultaneously to enable the first and second capacitor banks to get charged or discharged at a predetermined time interval respectively. Furthermore, the isolating diode is connected with negative terminals of the capacitor banks for preventing reverse charging of the capacitor banks.

Other aspects, advantages, and salient features of the present invention will become apparent to those skilled in the art from the following detailed description, which delineate the present invention in different embodiments.

BRIEF DESCRIPTION OF DRAWINGS

These and other features, aspects, and advantages of the present invention will become better understood when the following detailed description is read with reference to the accompanying figures.

Fig. l is a block diagram illustrating the whole construction of the multifunctional converter, in accordance with an embodiment of the present invention. Fig. 2 illustrates the arrangement of the converter assembly between the primary source (solar/wind power) and the battery/motor (load), in accordance with an embodiment of the present invention.

Fig. 3 is a circuit diagram illustrating all components used in the converter, in accordance with an embodiment of the present invention.

Fig. 4 and 5 are alternative circuit diagrams illustrating optional components used the converter, in accordance with an embodiment of the present invention.

Fig. 6 illustrates charging of first capacitor bank and discharging of second capacitor bank, in accordance with an embodiment of the present invention.

Fig. 7 illustrates discharging of first capacitor bank and charging of second capacitor bank, in accordance with an embodiment of the present invention.

Fig. 8 illustrates charging and discharging of both capacitor banks at same time, in accordance with an embodiment of the present invention.

List of reference numerals

100 primary power source (AC/DC input)

200 rectifier assembly

D1- D4 diodes

300 input side filter

FC1 first capacitive filter

400 capacitor based assembly

CB 1 first capacitor bank

CB2 second capacitor bank

S1-S5 five switches

D5 isolating diode

402 microcontroller

404 sensor

500 output side filter

FC2 second capacitive filter FL inductor filter

BD blocking diode

FD freewheeling diode

600 load (DC output) 700 auxiliary battery

DETAILED DESCRIPTION OF THE INVENTION

Various embodiments described herein are intended only for illustrative purposes and subject to many variations. It is understood that various omissions and substitutions of equivalents are contemplated as circumstances may suggest or render expedient, but are intended to cover the application or implementation without departing from the scope of the present invention. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting.

The use of terms “including,” “comprising,” or “having” and variations thereof herein are meant to encompass the items listed thereafter and equivalents thereof as well as additional items. Further, the terms, “an” and “a” herein do not denote a limitation of quantity, but rather denote the presence of at least one of the referenced item.

According to an embodiment of the present invention, as shown in Fig. 1-2, the multifunctional/multipurpose converter comprises a capacitor/super capacitor/ultra capacitor based assembly (400) to be eclectically coupled between a primary source (100) and a load (600); an input filter (300) coupled at a voltage input terminal of the capacitor based assembly (400); and an output filter (500) coupled at a voltage output terminal of the capacitor based assembly (400). Preferably, the primary source (100) includes both renewable power supply and non-renewable power supply; whereas the load (600) includes a rechargeable battery, a DC (direct current)/Permanent Magnet motor and any other load requiring high energy pulse input.

According to an embodiment of the present invention, as shown in Fig. 1 and 3, the capacitor based assembly (400) comprises a first capacitor bank (CB1) connected with a second capacitor bank (CB2) in a parallel electrical circuit; four semiconductor switches i.e. indicated as first switch (SI), second switch (S2), third switch (S3), and fourth switch (S4), operatively coupled in the electrical circuit to allow charging and discharging of the capacitor banks (CB1, CB2); a microcontroller (402) adapted to control operation of the switches (SI, S2, S3, S4) according to availability of the primary source (i.e. charging capacity of the primary source) and power generation/requirement thereat; and an isolating diode (D5) coupled between the input filter (300) and the capacitor banks (CB1, CB2), whereas anode side of the isolating diode (D5) (that isolates the primary source from the capacitor banks) is connected with negative terminals of the capacitor banks (CB1, CB2) for preventing reverse charging of the capacitor banks (CB1, CB2); thus back flow of the current from the source to capacitor banks can be prevented. Further, the capacitor banks (CB1, CB2) may be replaced with super capacitors or ultra capacitors, if needed. Furthermore, the primary source (100) may be an AC (alternating current) source or a DC (direct current) source.

In a preferred embodiment as shown in Fig. 3-4, at the input side, a rectifier assembly (200) comprising diodes (DI, D2, D3, D4) is provided in the electrical circuit between the primary source (100) and a first capacitive filter (FC1) of the input filter (300) (i.e. used for smoothing the input voltage). If the input is an AC voltage, the diodes (DI, D2, D3, D4) are used to rectify the AC voltage into the DC voltage which is further fed into the first filter (FC1). In case of the DC input voltage, only DI and D4 conduct and input is made available directly to FC1. Similarly, at the output side, the output filter (500) comprises a second capacitive filter (FC2) and an inductor (FL) which are adapted to remove ripples in output voltage and current, respectively.

In a preferred embodiment as shown in Fig. 5, a blocking diode (BD) is provided in the electrical circuit between the capacitor banks (CB1, CB2) and the load (600) for preventing back flow of the electricity.

In a preferred embodiment as shown in Fig. 4, a freewheeling diode (FD) is provided in parallel with the motor while used as the load (600) for providing a path to stored energy as back EMF (electromotive force) in the motor.

According to an embodiment of the present invention, as shown in Fig. 6, in the first operational mode, the microcontroller (402) is configured to close the first and fourth switches (SI, S4), and to open the second and third switches (S2, S3) at same time. Thus, it enables the first capacitor bank (CB1) to get charged by receiving power (as indicated input current i and input voltage VG) from the primary source (100), and simultaneously the second capacitor bank (CB2) to get discharged by releasing power (as indicated with output current icB2 and output voltage VCB2) into the load (600). Here, the capacitor banks act as a secondary power source.

According to an embodiment of the present invention as shown in Fig. 7, in the second operational mode, the microcontroller (402) is configured to close the second and third switches (S2, S3), and to open the first and fourth switches (SI, S4) at same time. Thus, it enables the second capacitor bank (CB2) to get charged by receiving power (as indicated input current i and input voltage VG) from the primary source (100), and the first capacitor bank (CB1) to get discharged by releasing power (as indicated with output current icBi and output voltage VCBI) into the load (600). Here, the capacitor banks act as a secondary power source.

According to an embodiment of the present invention, as shown in Fig. 8, in the third operational mode, the microcontroller (402) is configured to close the four switches (S1-S4) simultaneously to enable the first and second capacitor banks (CB1, CB2) to get charged or discharged at the same time at a predetermined time interval. In this case, the battery (load) directly connects with the primary source and the capacitor banks work as DC link capacitor which maintains a constant voltage at the output terminals of the converter. So in this way, the converter can be used in some application like in microgrids, solar power battery charging, etc.

According to an embodiment of the present invention, as shown in Fig. 2 and 6-8, at the output terminal side, the electricity/current flow from the capacitor banks (CB1, CB2) to the load (600) is turned on while the second and fourth switches (S2, S4) are closed, and turned off while the second and fourth switches (S2, S4) are opened. Whereas, at the input terminal side, the electricity/current flow from the primary source (100) to the capacitor banks (CB1, CB2) is turned on while the first and third switches (SI, S3) are closed, and turned off while the first and third switches (SI, S3) are opened.

According to an embodiment of the present invention, the microcontroller (402) is configured to operate the switches in a voltage reduction mode. Particularly, the microcontroller (402) is configured to keep the first and third switches (SI, S3) closed till the capacitor banks (CB1, CB2) are charged upto a required load voltage value (i.e. set voltage value), thereafter to open the first and third switches (SI, S3) soon the voltage at the capacitor banks become higher than the set voltage value, thereby enabling the capacitor banks (CB1, CB2) to discharge at the set voltage value by closing or opening the second and fourth switches (S2, S4) simultaneously or alternatively. For example, if the required load voltage is set to the 12 volts (i.e. the set voltage value as coded in the microcontroller) and the primary source generates 20 volts which is higher than the set voltage value; in that event the microcontroller gives signal to open the switches SI and S3 once the capacitor banks get charged at 12 volts which is requirement of the load. Then, the capacitor banks deliver voltage to the load by opening and closing the switches S2 and S4. As soon as the capacitor banks get discharged, they are again connected to the primary source by closing the switches SI and S3. This phenomenon may be repeated again and again so that a constant/required voltage becomes available at the output terminal of the converter.

In a preferred embodiment, where the renewable power supply such as solar panel or wind turbine is used as the primary source (100) (whose power output is fluctuating in nature and depends on the climatic condition), the microcontroller (402) is coupled with at least one sensor (404) that is adapted to regulate switching speed/time/frequency according to climatic condition, and to give signal to the microcontroller (402) to open the first and third switches (SI, S3) and simultaneously close a fifth switch (S5) placed between an auxiliary battery (700) and the first and third switches (SI, S3) so that excess electric energy is stored in the auxiliary battery (700) while the electricity consumption of the load (600) is fulfilled from the capacitor banks (CB1, CB2) as per the set voltage value.

For example, during the sunny day or windy weather, the solar panels generate maximum electric energy/power, thus it can be sensed by the sensor (404) which gives signal to the microcontroller (404) to make high switching frequency. Because the charging rate of capacitors increases so they can provide maximum power to the battery (during discharging) and can maintain sufficient voltage across the battery terminals. Similarly, when wind turbine generates sufficient output power then the capacitor based assembly operates with high switching frequency and transfers maximum power to the battery. If the input voltage (or generated voltage) is higher than the set voltage value of the battery then the microcontroller (402) opens the switches. To avoid power loss, that additional/excess power can be stored in the auxiliary battery (700) (as shown in Fig. 5) so there will be maximum usage of generated energy. In order to make this operation automatic, a complimentary switch S5 is coupled in the circuit along with the first and third switches (SI, S3). When the voltage at the capacitor banks is higher than the set voltage value, this complimentary switch (S5) gets closed and at the same time the first and third switches (SI, S3) get opened, thus the extra energy is stored in the auxiliary battery (700). The switches are closed back by the microcontroller only if the input voltage attains the set value.

On the other hand, in the evening, cloudy, and less windy weather, particularly when the output power is low, it is difficult to charge the battery directly, thus it can be sensed by the sensor (404) which gives signal to the microcontroller (404) to slow the switching speed. If the battery is directly connected with a weak primary source, then the battery draws more current from the primary source and acts as heavy load on the source. As a result, the source cannot withstand the load and fails to supply the power. However, if the primary source is connected to the capacitor banks (as shown Fig. 6-8), the capacitor banks can store the energy gradually from the fluctuating voltage and can be charged up to the set value. This becomes possible because of the characteristics of the capacitor. Once it is charged with some value of the voltage, the same voltage appears at its terminals. Thus, it behaves as an open circuit and does not demand any current from the source. Hence, the source does not experience any load if the capacitor is connected with the source. Then the capacitor banks can be connected to the battery to charge it easily. During this period, the switching speeds can be made lower using the sensor so that the capacitor banks can be charged to the set value.

Thus, the sensor (404) is configured to identify the climatic conditions to give signal to the microcontroller (402). The microcontroller manipulates the signals and accordingly controls the switching speed/time/frequency. In this way, the microcontroller in combination with the sensor operates the switching mechanism. Preferably, the switches are made up of MOSFETs, IGBTs, etc. Further, the switching speed/time may be changed as per requirement.

Particularly, in battery charging application, the capacitor based assembly provides following advantages:

• Capacitors have characteristics to get charged and discharged quickly depending on the time constant of the circuit which can be set as per our requirements. • Once the capacitor gets fully charged it does not consume any more power from the source. Hence, burden on the source is reduced and they can easily supply power to the capacitors. On the contrary, if battery is connected directly with the source then the battery consumes large amount of power (depending on state of charge of battery), sometime it acts as burden on the source especially in case of solar panel and wind turbine and draws more current/power.

• The capacitor banks are fully charged initially up to the set values and then they are disconnected from the source. Then these capacitor banks charge the battery. Hence, the isolation is provided between the source and the battery because they are not connected with each other physically.

• Since two capacitors supply power to the battery alternatively, the converter can work for 100% duty cycle and maintains uninterrupted/constant power at the output side. Therefore, no issue of voltage fluctuation arises and constant voltage/current can be maintained at the battery /load terminals.

• The battery gets power from the capacitor banks whereas the capacitor banks get regulated power from the source. When the potential of the battery is nearly same as that of the capacitor, energy transfer becomes minimal as the capacitors do not consume power when it is fully charged. Thus, there is no issue of overcharging. Thus, it helps to maintain healthy condition of the battery as well as to increase the battery life span.

• The converter can be used as a self-sustainable electric vehicle (EV) charger with renewable energy sources like solar and wind energy sources for the charging of storage battery. So, there would be better utilization of renewable sources and such self-sustainable EV charging station can be built anywhere where proper sunlight or wind velocity is available.

In another application the capacitor based assembly is used to operate the DC motor or any other load directly where the converter behaves little differently. The converter is operated at high switching speed so that the capacitor banks can be charged from the primary source and then gets disconnected from there. After getting fully charged, the capacitor banks behave as the secondary source and are able to feed the motor. The capacitors are then discharged quickly and can provide constant power to the motor. Since the switching speed of the semiconductor switches are very high, the converter can transfer power quickly and the motor can run without any fluctuations.

The main advantage is that the motor will be protected from the overload (or for blocking condition) because of the isolation formed by the capacitor banks. The converter provides isolation and this application can be used with the conventional DC motors and Permanent Magnet motors. If the DC motor gets any sudden load on it and its rotor becomes blocked because of the heavy load then the motor draws very high current continuously and gets heated up and in worst case the motor catch fire too and may damage the source side if it is operated with the battery (as primary source). In case of a very high current drawn from the battery, the motor may get damaged permanently and also may not power up other system connected with it. This kind of problem can be seen in battery operated devices like robots, rovers etc. Thus, such kind of problems can be avoided by using the present converter. For permanent magnet motor, if the short-circuit occurs that the stator generated field may try to demagnetise the field of the magnet and there are possibilities that the magnet will lose the magnetism permanently. The capacitor based assembly will isolate the motor from the primary source and loss of magnetism can also be prevented. As used as isolation converter for motor, there will be introduction of freewheeling diode (FD) which provides the path to stored energy as back EMF in the motor.

When the capacitor banks get discharged then they cannot supply any more power to the motor. Again, they will get charged from the primary source and then provide power supply to the motor. Therefore, very less current will be taken by the primary source as well as load when motor gets short circuited. The motor can easily bear this current without getting damaged. So, the motor neither gets burnt nor harms to the battery (when used as primary source).

The present converter can also be used to supply pulse power for some applications. For the small rating and short period of timing of pulse power the normal capacitors are suitable. For high energy and power density, the supper capacitors or ultra-capacitors can be used in the present converter. Therefore, it can provide high energy pulse output. These kinds of applications are found in LESAR, for flickering lights, etc. Thus, the present converter can also be used to provide pulse power or high discharge power for special applications. The foregoing descriptions of exemplary embodiments of the present invention have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the invention to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiment was chosen and described in order to best explain the principles of the invention and its practical application, to thereby enable the persons skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated. It is understood that various omissions, substitutions of equivalents are contemplated as circumstance may suggest or render expedient, but is intended to cover the application or implementation without departing from the scope of the claims of the present invention.

Claims

CLAIMS We claim:

1. A multifunctional device for electricity flow between a primary source (100) and a load (600), the device comprising: a capacitor based assembly (400); an input filter (300) coupled at a voltage input terminal of the capacitor based assembly (400); and an output filter (500) coupled at a voltage output terminal of the capacitor based assembly (400); characterized in that the capacitor based assembly (400) comprises a first capacitor bank (CB1) connected with a second capacitor bank (CB2) in a parallel electrical circuit; four semiconductor switches [first (SI), second (S2), third (S3), fourth (S4)] operatively coupled in the electrical circuit to allow charging and discharging of the capacitor banks (CB1, CB2); a microcontroller (402) adapted to control operation of the switches (SI, S2, S3, S4) according to availability of the primary source (100) and power generation/requirement thereat; and an isolating diode (D5) coupled between the input filter (300) and the capacitor banks (CB1, CB2), wherein the microcontroller (402) is configured to: close the first and fourth switches (SI, S4), and open the second and third switches (S2, S3) at same time in a first operational mode; thereby enabling the first capacitor bank (CB1) to get charged, and the second capacitor bank (CB2) to get discharged simultaneously, close the second and third switches (S2, S3), and open the first and fourth switches (SI, S4) at same time in a second operational mode; thereby enabling the second capacitor bank (CB2) to get charged, and the first capacitor bank (CB1) to get discharged.

2. The multifunctional device as claimed in claim 1, wherein the electricity flow from the capacitor banks (CB1, CB2) to the load (600) is turned on while the second and fourth switches (S2, S4) are closed, and turned off while the second and fourth switches (S2, S4) are opened.

3. The multifunctional device as claimed in claim 1, wherein the electricity flow from the source (100) to the capacitor banks (CB1, CB2) is turned on while the first and third switches (SI, S3) are closed, and turned off while the first and third switches (SI, S3) are opened.

4. The multifunctional device as claimed in claim 1, wherein the primary source (100) includes renewable power supply and non-renewable power supply, and the load (600) includes a rechargeable battery, a DC (direct current)/Permanent Magnet motor, and any other load requiring high energy pulse input.

5. A method for electricity flow through the multifunctional device as claimed in claim 1, the method comprising steps of: setting a voltage value in the microcontroller (402) as required by the load (600); sending signal, by the microcontroller (402), to the first and third switches (SI, S3) to be closed alternatively till the capacitor banks (CB1, CB2) are charged upto the set voltage value keeping the second and fourth switches (S2, S4) open respectively; sending signal, by the microcontroller (402), to the first and third switches (SI, S3) to be open alternatively as the voltage at the capacitor banks (CB1, CB2) becomes higher than the set voltage value keeping the second and fourth switches (S2, S4) closed respectively.

6. The method as claimed in claim 5, wherein the method comprises a step of regulating switching speed/frequency, by the microcontroller (402), according to climatic condition as sensed by one sensor (404), and giving signal to open the first and third switches (SI, S3) and simultaneously closing a fifth switch (S5) placed between an auxiliary battery (700) and the first and third switches (SI, S3) so that excess electric energy is stored in the auxiliary battery (700) while the electricity consumption of the load (600) is fulfilled from the capacitor banks (CB1, CB2) as per the set voltage value.

7. The multifunctional device as claimed in claim 4, wherein the primary source (100) is an AC (alternating current) source or a DC (direct current) source, and the capacitor banks (CB1, CB2) are supper capacitors that act as secondary power source.

8. The multifunctional device as claimed in claim 4, wherein a freewheeling diode (FD) is in parallel with the motor being used as the load (600) for providing a path to store energy.

9. The multifunctional device as claimed in claim 1, wherein a blocking diode (BD) is provided in the electrical circuit between the capacitor banks (CB1, CB2) and the load (600) for preventing back flow of the electricity.

10. The multifunctional device as claimed in claim 1, wherein the output filter (500) comprises a second capacitive filter (FC2) and an inductor (FL) adapted to remove ripples in output voltage and current respectively.

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