DESC:SOFT STARTING DC-DC CONVERTER AND METHOD OF OPERATION THEREOF
CROSS REFERENCE TO RELATED APPLICATIONS
The present application claims priority from Indian Provisional Patent Application No. 202321065122 filed on 28/09/2023, the entirety of which is incorporated herein by a reference.
TECHNICAL FIELD
Generally, the present disclosure relates to DC-DC converter. Particularly, the present disclosure relates to a system and method for soft starting DC-DC converter.
BACKGROUND
Typically, DC-DC converters are electronic devices that convert a direct current (DC) power from one to another level. The DC-DC converters are used in various applications such as (but not limited to) power supplies for electronic devices, battery management systems, and renewable energy systems.
Conventionally, the DC-DC converters employ a soft start mechanism to protect their sensitive components and load. Specifically, the soft start mechanism refers to gradually increasing the output voltage over a predetermined time to limit the sudden inrush of the input current. Traditionally, the soft start is achieved by connecting an external capacitor to control the switching mechanism of the converter. In the external capacitor soft start mechanism, when the converter is powered on, the external capacitor begins to charge and the voltage across the capacitor rises with time. Subsequently, the rising voltage across the external capacitor controls the duty cycle to limit the output voltage and the input current through the feedback loop. Therefore, based on the external capacitor, the soft start mechanism is achieved.
However, there are certain underlining problems associated with the above-mentioned existing mechanism for soft starting the DC-DC converters. For instance, the external capacitor takes long time to charge initially, leading to a prolonged startup period for the converter. Consequently, the inconsistent ramp-up of the output voltage at the load is observed which negatively impacts the converter performance. Further, any change in the value of capacitor over the time period (due to environmental conditions) will increase the harmonics/ripples in the output ramp-up voltage. Consequently, the ripples in the output ramp voltage adversely affect the performance of the load and the converter components.
Therefore, there exists a need for a mechanism for soft starting a DC-DC converter that is efficient and overcomes one or more problems as mentioned above.
SUMMARY
An object of the present disclosure is to provide a system for soft start of a DC-DC power converter.
Another object of the present disclosure is to provide a method of soft start of a DC-DC power converter.
Yet another object of the present disclosure is to provide a system and method for soft start of a DC-DC converter capable of minimizing input current rush for improving efficiency and safety.
In accordance with a first aspect of the present disclosure, there is provided a system for soft start of a DC-DC power converter, the system comprises:
- a plurality of switching elements;
- a plurality of current sensors coupled with the plurality of switching elements;
- at least one resonant tank circuit coupled with the plurality of current sensors;
- at least one rectifier circuit coupled with the at least one resonant tank circuit; and
- a microcontroller communicably coupled with the plurality of switching elements, the plurality of current sensors and the least one rectifier circuit,
wherein the microcontroller is configured to operate the plurality of switching elements with a fixed duty cycle and/or a variable duty cycle.
The system and method for soft start of a DC-DC power converter, as described in the present disclosure, is advantageous in terms of providing a system with enhanced safety and efficiency for the soft start of a DC-DC power converter. Advantageously, operating at a resonating frequency reduces the switching losses and ripple voltage at the output of the rectifier circuit. Further, the variable duty cycle enables the switching elements to respond dynamically to transients or sudden changes in the load. Therefore, ensuring safer regulation of output voltage and current, adapting to changing load requirements for stable operation.
In accordance with another aspect of the present disclosure, there is provided a method of soft start of a DC-DC power converter, the method comprising:
- receiving a variable frequency duty cycle, at an input terminal of a plurality of switching elements;
- sensing current signals, at an output terminal of the plurality of switching elements, via at least one current sensors;
- receiving and storing the sensed current signals, via at least one resonant tank circuit;
- modulating a fixed duty cycle and/or a variable duty cycle of the switching elements;
- controlling the plurality of switching elements based on the modulated the fixed duty cycle and/or the variable duty cycle.
Additional aspects, advantages, features, and objects of the present disclosure would be made apparent from the drawings and the detailed description of the illustrative embodiments constructed in conjunction with the appended claims that follow.
It will be appreciated that features of the present disclosure are susceptible to being combined in various combinations without departing from the scope of the present disclosure as defined by the appended claims.
BRIEF DESCRIPTION OF DRAWINGS
The summary above, as well as the following detailed description of illustrative embodiments, is better understood when read in conjunction with the appended drawings. For the purpose of illustrating the present disclosure, exemplary constructions of the disclosure are shown in the drawings. However, the present disclosure is not limited to specific methods and instrumentalities disclosed herein. Moreover, those in the art will understand that the drawings are not to scale. Wherever possible, like elements have been indicated by identical numbers.
Embodiments of the present disclosure will now be described, by way of example only, with reference to the following diagrams wherein:
Figures 1 and 2 illustrate block diagrams of a system for soft start of a DC-DC power converter, in accordance with different embodiments of the present disclosure.
Figure 3 illustrates a flow chart of a method of soft start of a DC-DC power converter, in accordance with another embodiment of the present disclosure.
In the accompanying drawings, an underlined number is employed to represent an item over which the underlined number is positioned or an item to which the underlined number is adjacent. A non-underlined number relates to an item identified by a line linking the non-underlined number to the item. When a number is non-underlined and accompanied by an associated arrow, the non-underlined number is used to identify a general item at which the arrow is pointing.
DETAILED DESCRIPTION
The following detailed description illustrates embodiments of the present disclosure and ways in which they can be implemented. Although some modes of carrying out the present disclosure have been disclosed, those skilled in the art would recognize that other embodiments for carrying out or practicing the present disclosure are also possible.
As used herein, the terms “soft start”, “ramp start”, “soft initiation”, and “gradual initiation” are used interchangeably and refer to a mechanism of gradually increasing the power supply to a device, particularly during the startup. The gradual increase in the power supply enables the device to prevent the sudden inrush current, thereby, preventing the electrical stress or damage to components. Further, soft start enables the device to extend the lifespan of electrical components by reducing thermal and mechanical stress.
As used herein, the terms “DC-DC power converter”, “voltage converter”, “power converter”, and “converter” are used interchangeably and refer to an electronic device that converts a DC input power from one level to another. The DC-DC converter receives a DC voltage from a source (a battery or a power supply) and converts it to a desired voltage level at the output, which can be higher, lower, or of the same magnitude as the input. The converters enable the voltage level adjustment for efficient power delivery and optimal operation of electronic circuits. The design of DC-DC converters varies on the basis of their intended application and required functionality. Common topologies for DC-DC converter may include (but not limited to) buck converter, boost converter, buck-boost converter, and cuk converters.
As used herein, the terms “switching elements”, “switches”, “toggle switches”, and “gate-pulse components” are used interchangeably and refer to electrical components designed to control the flow of electrical current in the electronic circuits. The switching elements enable or interrupt the flow of current based on switching conditions, effectively acting as gates to manage the circuit operation. Types of switching elements may include (but not limited to) Bipolar Junction Transistors (BJTs), Field-Effect Transistors (FETs), diodes, and analog switches.
As used herein, the term “current sensor”, and “sensor” are used interchangeably and refer to a device that measures and monitors the electrical current flowing through various parts of the electronic circuit. Further, the accurate current measurement is essential for managing power distribution, optimizing performance, ensuring safety, and improving the overall efficiency of the electronic circuit. Specifically, in the electronic devices, the current sensors detect the current flowing through the switching components of the electronic circuits.
As used herein, the terms “resonant tank circuit”, “resonant circuit”, and “tank circuit” are used interchangeably and refer to an electrical circuit consisting of an inductor (L) and a capacitor (C) that stores and exchanges energy. The resonant tank circuit resonates at a specific frequency, known as the resonant frequency, at which the impedance of the circuit is zero. The resonant tank circuits are commonly used in (but not limited to) oscillators, filters, tuning circuits and other related applications. When the tank circuit is energized, current flows through the inductor, creating a magnetic field. As the current increases, the energy is transferred to the capacitor. Once the capacitor is fully charged, it starts to discharge, sending current back through the inductor. Therefore, at the resonant frequency the resonant tank circuit, enables for the efficient transfer of energy between these components. The transfer occurring at the resonant frequency, minimizes the losses associated with switching.
As used herein, the terms “rectifier circuit”, “power rectifier”, and “rectifier” are used interchangeably and refer to an electrical circuit that converts alternating current (AC) into direct current (DC). The rectifier circuits provide a stable DC voltage from an AC source. The two main types of rectifier circuits are half-wave rectifier and full-wave rectifier. The half-wave rectifier utilizes a single diode to allow current to flow only during one half of the AC cycle, resulting in a pulsating DC output. The Full-Wave Rectifier employs multiple diodes (for example, bridge configuration) to utilize both halves of the AC waveform, yielding a smoother and more continuous DC output.
As used herein, the terms “microcontroller”, “controller”, “embedded controller and “microprocessor” are used interchangeably and refer to an integrated circuit designed to govern specific operations in embedded systems. The microcontroller typically includes a processor core, memory (both RAM and flash), and programmable input/output peripherals on a single chip. The microcontroller is used to execute control functions in a variety of applications, ranging from consumer electronics to industrial automation. Specifically, the microcontroller implements algorithms for voltage regulation, such as PID (Proportional-Integral-Derivative) control, to maintain the output voltage within specified limits. Further, the microcontroller monitors key parameters such as input voltage, output voltage, and output current, thus, ensuring safe and efficient operation.
As used herein, the terms “communicably coupled”, “communicably linked”, and “communicably interfaced” are used interchangeably and refer to an interaction between different circuit components enabling the exchange of information or controlling of signals. The coupling enables coordinated operation, ensuring that various parts of the converter work together effectively to achieve desired performance metrics. Specifically, communicable coupling involves sharing control signals between the microcontroller and power stage components (like switches and feedback circuits) to adjust the operation based on real-time conditions. The types of coupling may include (but not limited to) electrical coupling, optical coupling, wireless coupling, mechanical coupling, magnetic coupling and thermal coupling.
As used herein, the term “fixed duty cycle” refers to a duty cycle when the ratio between the switch ON time and the total switching period is constant. The ratio signifies that the converter operates within predetermined time-period, during which the power switch is turned ON, resulting in a predictable output behaviour. In a fixed duty cycle converter, the microcontroller sets the duty cycle to a predetermined value, implying that the energy delivered to the load is controlled by a constant ratio.
As used herein, the term “variable duty cycle” refers to a duty cycle when the ratio between the ON time and the total switching period changes dynamically based on input conditions, output requirements, and load variations. The variable duty cycle enables more flexible and efficient operation compared to a fixed duty cycle. The microcontroller monitors the output voltage, current, and the input voltage to determine the suitable duty cycle needed to meet load demands.
As used herein, the term “input terminal” refers to a connection point for applying the control signal or voltage to activate or switch ON the switching element. The switching elements may include (but not limited to) transistors (BJTs, MOSFETs), thyristors, and relays. The input terminal receives a control signal that determines the switching condition (switch ON or switch OFF) of the switching element.
As used herein, the term “output terminal” refers to a connection point for delivering the converted output voltage to the load. The output terminal provides the final voltage level that powers other devices or circuits. The output terminal serves as the point for regulated DC voltage after the conversion process (step-up or step-down).
As used herein, the term “variable frequency duty cycle” refers to a duty cycle when both the duty cycle (the ratio of ON time to the total switching period) and the frequency of the switching signal are changed dynamically. The variable frequency duty cycle provides improved efficiency and responsiveness in power conversion. The variable frequency duty cycle is implemented using advanced control techniques, such as (but not limited to) Pulse Width Modulation (PWM), Pulse Code Modulation (PCM) and Frequency Modulation (FM).
As used herein, the terms “resonant frequency”, “resonance frequency”, and “resonance” are used interchangeably and refer to the frequency at which the reactive components (inductors and capacitors) in a resonant circuit oscillates naturally. At the resonant frequency, the impedance of the circuit is minimized, enabling efficient energy transfer and reduced switching losses. At the resonant frequency, the circuit transfers the energy between the inductor and capacitor with minimal energy loss, maximizing efficiency. The converter can operate with lower switching losses, which is particularly beneficial for high-frequency applications.
In accordance with a first aspect of the present disclosure, there is provided a system for soft start of a DC-DC power converter, the system comprises:
- a plurality of switching elements;
- a plurality of current sensors coupled with the plurality of switching elements;
- at least one resonant tank circuit coupled with the plurality of current sensors;
- at least one rectifier circuit coupled with the at least one resonant tank circuit; and
- a microcontroller communicably coupled with the plurality of switching elements, the plurality of current sensors and the least one rectifier circuit,
wherein the microcontroller is configured to operate the plurality of switching elements with a fixed duty cycle and/or a variable duty cycle.

Referring to figure 1, in accordance with an embodiment, there is described a system 100 for soft start of a DC-DC power converter. The system 100 comprises a plurality of switching elements 102 (102A-102N), a plurality of current sensors 104 (104A-104N) coupled with the plurality of switching elements 102, at least one resonant tank circuit 106 (106A-106N) coupled with the plurality of current sensors 104, at least one rectifier circuit 108 (108A-108N) coupled with the at least one resonant tank circuit 106, and a microcontroller 110 communicably coupled with the plurality of switching elements 102, the plurality of current sensors 104 and the least one rectifier circuit 108. Further, the microcontroller 110 is configured to operate the plurality of switching elements 102 with a fixed duty cycle and/or a variable duty cycle.
The plurality of current sensors 104 coupled with the plurality of switching elements 102 and are configured to sense current signals at output terminal 114 of the plurality of switching elements 102. Further, at least one resonant tank circuit 106 is coupled with the plurality of current sensors 104 and is configured to store the sensed current signals. Furthermore, based on the resonant frequency, the resonant tank circuit 106 transfers the stored current signals to the at least one rectifier circuit 108. Advantageously, transferring the current signals at the resonant frequency, enables resonant tank circuits 106 for Zero Voltage Switching (ZVS) or Zero Current Switching (ZCS) thereby, significantly reducing the switching losses and improving the overall efficiency. Furthermore, operating at the resonant frequency minimizes the sharp transitions in voltage and current, thus, reducing the generation of high-frequency noise at the output terminal. Further, the microcontroller 110 is configured to operate the plurality of switching elements 102 with a fixed duty cycle and/or a variable duty cycle. Consequently, operating the plurality of switching elements 102 with a fixed duty cycle facilitates consistent and predictable output signals and thus, ensures a reliable performance of the DC-DC power converter. Further, operating the plurality of switching elements 102 with a variable duty cycle enables the switching elements to respond dynamically to transients or sudden changes in the load. Therefore, the variable duty cycles enable safer regulation of output voltage and current, adapting to changing load requirements for stable operation.
Referring to figure 2, in accordance with an embodiment, there is described a system 100 for soft start of a DC-DC power converter. The system 100 comprises a plurality of switching elements 102A-102N, a plurality of current sensors 104A-104N coupled with the plurality of switching elements 102, at least one resonant tank circuit 106 coupled with the plurality of current sensors 104, at least one rectifier circuit 108 coupled with the at least one resonant tank circuit 106, and a microcontroller 110 communicably coupled with the plurality of switching elements 102, the plurality of current sensors 104 and the least one rectifier circuit 108. Further, the each switching element 102A-102N, of the plurality of switching elements 102, comprises an input terminal 112 and an output terminal 114.
In an embodiment, the each switching element, of the plurality of switching elements 102, comprises an input terminal 112 and an output terminal 114. Beneficially, separate input and output terminals enhance electrical isolation between the input signal and the output signal, thus reducing the risk of feedback interference and improving overall stability. Specifically, the current signal at the input terminal 112 of the plurality of switching elements 102 is electrically isolated from the current signal at the output terminal 114. Consequently, the feedback interference between the current signal at the input terminal 112 and the output terminal 114 is reduced and the overall stability of the switching element is increased.
In an embodiment, the each switching element is configured to receive a variable frequency duty cycle, at the input terminal 112. The variable frequency duty cycle enables the microcontroller 110 to adapt to dynamic changes in load, thus, providing minimal response time and improved stability. Further, by controlling the frequency of the duty cycle, the microcontroller 110 minimizes the load on the converter components, extending their lifespan and improving reliability.
In an embodiment, a current sensor, of the plurality of current sensors 104, is connected to the output terminal 114 of the each switching element. Each current sensor 102A-102N provides the continuous value of the output current of the switching element, enabling for immediate detection of changes in load conditions. Further, the plurality of current sensors 104 at the output of the switching element identifies overcurrent conditions or faults in the converter operation, facilitating protective actions by the microcontroller 110 to prevent damage to the converter components.

In an embodiment, the plurality of current sensors 104 are configured to sense current signals at the output terminal 114 of the plurality of switching elements 102 based on switching conditions. The plurality of current sensors 104 provides real-time current value at the output terminal 114 of the plurality of switching elements 102, reflecting the actual performance of each switching element under different operational states. By sensing current signals about specific switching conditions, the microcontroller 110 optimizes the operation of each switching element, improving overall converter efficiency.
In an embodiment, the at least one resonant tank circuit 106 is configured to receive and store the sensed current signals, based on the switching conditions. The resonant tank circuit 106 stores and gradually releases the sensed current values, thereby reducing the current fluctuations, leading to more stable output and reducing stress on converter components. Further, the resonant tank circuit 106 adapts to dynamic changes in load conditions by adjusting the sensed current value stored or released, providing a responsive and resilient current supply.
In an embodiment, the at least one resonant tank circuit 106 is configured to transfer the stored current signal to the at least one rectifier circuit 108, based on a resonant frequency of the variable frequency duty cycle. Beneficially, the operation of the resonant tank circuit 106 at resonant frequency minimizes the switching losses of the plurality of switching elements 102 thereby enhancing the overall efficiency of power conversion during the transfer of the stored current signal to the rectifier circuit 108. During the resonant frequency, the inductive reactance and capacitive reactance are equal in magnitude but opposite in phase, resulting in maximum energy transfer. Consequently, the resonant tank circuit 106 flattens the current waveform, leading to suitable conversion with reduced harmonics and ripple voltage at the output of the rectifier circuit 108.
In an embodiment, the microcontroller 110 is configured to receive output signal of the at least one rectifier circuit 108 and modulate the fixed duty cycle and/or the variable duty cycle of the plurality of switching elements 102 based on the received output signal. Advantageously, the microcontroller 110 modulates the duty cycle in real time based on the output signal, ensuring optimal performance under varying load conditions. Further, by precisely modulating the duty cycle, the microcontroller 110 controls the switching conditions of the plurality of switching elements 102 efficiently, thereby minimizing energy losses and enhancing overall efficiency, especially in applications with fluctuating power demands.
In an embodiment, the microcontroller 110 is configured to control the plurality of switching elements 102 based on the modulated the fixed duty cycle and/or the variable duty cycle. The microcontroller 110 enables the optimal operation of each switching element according to real-time requirements via precise modulation of the duty cycle. Further, by dynamically adjusting the duty cycles, the microcontroller 110 minimizes the energy losses and improves overall performance. Furthermore, modulation of the duty cycles and thereby control the operation of the switching elements, enables the converter to adapt quickly to changes in load, maintaining stable output voltage and current.
In accordance with a second aspect, there is described method 200 of soft start of a DC-DC power converter, the method 200 comprises:
- receiving a variable frequency duty cycle, at an input terminal 112 of a plurality of switching elements 102;
- sensing current signals, at an output terminal 114 of the plurality of switching elements 102, via at least one current sensors 104;
- receiving and storing the sensed current signals, via at least one resonant tank circuit 106;
- modulating a fixed duty cycle and/or a variable duty cycle of the switching elements;
- controlling the plurality of switching elements 102 based on the modulated the fixed duty cycle and/or the variable duty cycle.
Figure 3 describes a method of soft start of the DC-DC power converter. The method 200 starts at a step 202. At the step 202, the method comprises receiving a variable frequency duty cycle, at an input terminal 112 of a plurality of switching elements 102. At a step 204, the method comprises sensing current signals, at an output terminal 114 of the plurality of switching elements 102, via at least one current sensors 104. At a step 206, the method comprises receiving and storing the sensed current signals, via at least one resonant tank circuit 106. At a step 208, the method comprises modulating a fixed duty cycle and/or a variable duty cycle of the switching elements. At a step 210, the method comprises controlling the plurality of switching elements 102 based on the modulated the fixed duty cycle and/or the variable duty cycle. The method 200 ends at the step 210.
In an embodiment, the method 200 comprises receiving a variable frequency duty cycle, by each switching element at the input terminal 112.
In an embodiment, the method 200 comprises sensing current signals at the output terminal 114 of the plurality of switching elements 102 based on switching conditions, by the plurality of current sensors 104.
In an embodiment, the method 200 comprises receiving and storing the sensed current signals, based on the switching conditions, by the at least one resonant tank circuit 106.
In an embodiment, the method 200 comprises transferring the stored current signal to the at least one rectifier circuit 108, based on a resonant frequency of the variable frequency duty cycle, by the at least one resonant tank circuit 106.
In an embodiment, the method 200 comprises receiving output signal of the at least one rectifier circuit 108 and modulating the fixed duty cycle and/or the variable duty cycle of the plurality of switching elements 102 based on the received output signal, by the microcontroller 110.
In an embodiment, the method 200 comprises controlling the plurality of switching elements 102 based on the modulated the fixed duty cycle and/or the variable duty cycle, by the microcontroller 110.
In an embodiment, the method 200 comprises receiving a variable frequency duty cycle, by each switching element at the input terminal 112. Furthermore, the method 200 comprises sensing current signals at the output terminal 114 of the plurality of switching elements 102 based on switching conditions, by the plurality of current sensors 104. Furthermore, the method 200 comprises receiving and storing the sensed current signals, based on the switching conditions, by the at least one resonant tank circuit 106. Furthermore, the method 200 comprises transferring the stored current signal to the at least one rectifier circuit 108, based on a resonant frequency of the variable frequency duty cycle, by the at least one resonant tank circuit 106. Furthermore, the method 200 comprises receiving output signal of the at least one rectifier circuit 108 and modulating the fixed duty cycle and/or the variable duty cycle of the plurality of switching elements 102 based on the received output signal, by the microcontroller 110. Furthermore, the method 200 comprises controlling the plurality of switching elements 102 based on the modulated the fixed duty cycle and/or the variable duty cycle, by the microcontroller 110.
In an embodiment, the method 200 comprises receiving a variable frequency duty cycle, at an input terminal 112 of a plurality of switching elements 102. Furthermore, the method 200 comprises sensing current signals, at an output terminal 114 of the plurality of switching elements 102, via at least one current sensors 104. Furthermore, the method 200 comprises receiving and storing the sensed current signals, via at least one resonant tank circuit 106. Furthermore, the method 200 comprises modulating a fixed duty cycle and/or a variable duty cycle of the switching elements. Furthermore, the method 200 comprises controlling the plurality of switching elements 102 based on the modulated the fixed duty cycle and/or the variable duty cycle.
Based on the above-mentioned embodiments, the present disclosure provides significant advantages such as (but not limited to) enhanced safety and efficiency for the soft start of a DC-DC power converter, and reduced switching losses, thereby, ensuring safer regulation of output voltage and current of the DC-DC power converter.
It would be appreciated that all the explanations and embodiments of the system 100 also apply mutatis-mutandis to the method 200.
In the description of the present invention, it is also to be noted that, unless otherwise explicitly specified or limited, the terms “disposed,” “mounted,” and “connected” are to be construed broadly, and may for example be fixedly connected, detachably connected, or integrally connected, either mechanically or electrically. They may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Modifications to embodiments and combinations of different embodiments of the present disclosure described in the foregoing are possible without departing from the scope of the present disclosure as defined by the accompanying claims. Expressions such as “including”, “comprising”, “incorporating”, “have”, and “is” used to describe and claim the present disclosure are intended to be construed in a non-exclusive manner, namely allowing for items, components or elements not explicitly described also to be present. Reference to the singular is also to be construed to relate to the plural where appropriate.
Although embodiments have been described with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More particularly, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the present disclosure, the drawings, and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, alternative uses will also be apparent to those skilled in the art.
,CLAIMS:WE CLAIM:
1. A system (100) for soft start of a DC-DC power converter, the system (100) comprises:
- a plurality of switching elements (102);
- a plurality of current sensors (104) coupled with the plurality of switching elements (102);
- at least one resonant tank circuit (106) coupled with the plurality of current sensors (104);
- at least one rectifier circuit (108) coupled with the at least one resonant tank circuit (106); and
- a microcontroller (110) communicably coupled with the plurality of switching elements (102), the plurality of current sensors (104) and the least one rectifier circuit (108),
wherein the microcontroller (110) is configured to operate the plurality of switching elements (102) with a fixed duty cycle and/or a variable duty cycle.
2. The system (100) as claimed in claim 1, wherein the each switching element, of the plurality of switching elements (102), comprises an input terminal (112) and an output terminal (114).

3. The system (100) as claimed in claim 2, wherein the each switching element is configured to receive a variable frequency duty cycle, at the input terminal (112).

4. The system (100) as claimed in claim 1, wherein a current sensor, of the plurality of current sensors (104), is connected to the output terminal (114) of the each switching element.

5. The system (100) as claimed in claim 1, wherein the plurality of current sensors (104) are configured to sense current signals at the output terminal (114) of the plurality of switching elements (102) based on switching conditions.

6. The system (100) as claimed in claim 1, wherein the at least one resonant tank circuit (106) is configured to receive and store the sensed current signals, based on the switching conditions.

7. The system (100) as claimed in claim 1, wherein the at least one resonant tank circuit (106) is configured to transfer the stored current signal to the at least one rectifier circuit (108), based on a resonant frequency of the variable frequency duty cycle.

8. The system (100) as claimed in claim 1, wherein the microcontroller (110) is configured to receive output signal of the at least one rectifier circuit (108) and modulate the fixed duty cycle and/or the variable duty cycle of the plurality of switching elements (102) based on the received output signal.

9. The system (100) as claimed in claim 1, wherein the microcontroller (110) is configured to control the plurality of switching elements (102) based on the modulated the fixed duty cycle and/or the variable duty cycle.

10. A method (200) of soft start of a DC-DC power converter, the method (200) comprising:
- receiving a variable frequency duty cycle, at an input terminal (112) of a plurality of switching elements (102);
- sensing current signals, at an output terminal (114) of the plurality of switching elements (102), via at least one current sensors (104);
- receiving and storing the sensed current signals, via at least one resonant tank circuit (106);
- modulating a fixed duty cycle and/or a variable duty cycle of the switching elements;
- controlling the plurality of switching elements (102) based on the modulated the fixed duty cycle and/or the variable duty cycle.

11. The method (200) as claimed in claim 11, the method (200) comprises transferring the stored current signal to the at least one rectifier circuit (108), based on a resonant frequency of the variable frequency duty cycle.

12. The method (200) as claimed in claim 11, the method (200) comprises receiving output signal of the at least one rectifier circuit (108).