HIGH GAIN MULTI STAGE, MULTI DEVICE DC-DC BOOST CONVERTER USING IMPROVED SWITCHED INDUCTOR TECHNIQUE

Abstract

ABSTRACT “HIGH GAIN MULTI STAGE, MULTI DEVICE DC-DC BOOST CONVERTER USING IMPROVED SWITCHED INDUCTOR TECHNIQUE” The present invention provides a high-gain, multi-stage DC-DC boost converter with an improved switched inductor technique, specifically designed for solar photovoltaic (PV) applications. This converter incorporates a multi-stage switched inductor network with inductors, capacitors, and two switches that sequentially control the charging and discharging cycles across four modes. By charging inductors in parallel and discharging them in series, the converter achieves high voltage gain with minimal duty cycle, resulting in reduced component size, lower conduction losses, and increased efficiency compared to existing converters. The design effectively minimizes voltage stress on components and is highly adaptable for renewable energy applications, including electric vehicles and micro grids. The novel integration of these elements offers enhanced performance, reduced costs, and a more efficient power conversion solution for modern energy systems. Figure 1

Specification

Description:TECHNICAL FIELD
[0001] The present invention relates to the field of solar systems, and more particularly, the present invention relates to the high gain multi stage, multi device DC-DC boost converter using improved switched inductor technique for solar PV application.
BACKGROUND ART
[0002] The following discussion of the background of the invention is intended to facilitate an understanding of the present invention. However, it should be appreciated that the discussion is not an acknowledgment or admission that any of the material referred to was published, known, or part of the common general knowledge in any jurisdiction as of the application's priority date. The details provided herein the background if belongs to any publication is taken only as a reference for describing the problems, in general terminologies or principles or both of science and technology in the associated prior art.
[0003] Some problems of Existing DC-DC converter are discussed as below:
- a) Achieving high voltage gain at higher duty ratio ultimately cause significant conduction losses in switches,
- b) Reducing overall efficiency.
- c) High input current ripple and high output voltage ripple.
- d) Use of more number of inductors and capacitors making the circuit complex that result in making the converter bulky.
[0004] Addressing these research gaps, the current invention will contribute to develop a new converter topology that simplify circuit design, reduce size and cost. This will make renewable energy systems more efficient and adaptable to diverse industrial applications. Therefore, ongoing research and innovation in this field are crucial for achieving more sustainable and effective power conversion solutions.
[0005] There are some topologies already existing which are being discussed with heie merits and demerits as stated below.
[0006] Fig. 2 showcases a recent C'uk-founded topology (NISBb) along with two diodes, four capacitors, and three inductors. This converter uses a single power switch that is less stressful. Irrespective of the less pressure on the power converter, there are challenges with the converter's application because the ranges that its gain offers for the buck and boost modes are not ideal. Furthermore, more research is needed to evaluate the converter's effectiveness.
[0007] Fig.2 Novel high gain single-switch DC-DC buck- boost converter with continuous input and output power (NISBb)
[0008] In Fig. 3 the proposed converter has parallel with the C'uk converter as both employ just one power switch. Additionally, it bears resemblances to the SEPIC converter due to its positive voltage output. Both the C'uk and single ended primary inductor converters are theoretically restricted to a highest possible value of 10 for voltage gain, although in practical applications, this gain is often less because of conduction and switching losses. Addition of more passive components including inductors, diodes, and capacitors in place of the hybrid switched-capacitor construction has been done in order to overcome this restriction and improve overall converter efficiency. The fig. 3 shows the improved version of the converter, which consists of four diodes, three inductors, six capacitors (SSBb), and a single power switch. This alternation resulted in a threefold increase in voltage gain and consequently expanded the boost range, system complexity and cost.
[0009] In light of the foregoing, there is a need for High gain multi stage, multi device DC-DC boost converter using improved switched inductor technique for solar PV application that overcomes problems prevalent in the prior art associated with the traditionally available method or system, of the above-mentioned inventions that can be used with the presented disclosed technique with or without modification.
[0010] To overcome the problem, in this new converter an improved switched inductor with multi stage structure is invented. From its state space analysis, parameters such as inductor, capacitor, o/p voltage for i/p voltage 24v, output current for 200 w power calculated. Then its simulation being done. From simulation it is cleared that that this converter is best in comparison to other existing converter with respect to voltage gain, O/P voltage, less size of components than other existing one .All this achieved with minimal duty ratio.
[0011] 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.
OBJECTS OF THE INVENTION
[0012] The principal object of the present invention is to overcome the disadvantages of the prior art by providing high gain multi stage, multi device DC-DC boost converter using improved switched inductor technique for solar PV application.
[0013] Another object of the present invention is to provide high gain multi stage, multi device DC-DC boost converter using improved switched inductor technique for solar PV application that achieves high voltage gain with a minimal duty ratio.
[0014] Another object of the present invention is to provide high gain multi stage, multi device DC-DC boost converter using improved switched inductor technique for solar PV application that makes the converter more efficient by reducing conduction losses.
[0015] Another object of the present invention is to provide high gain multi stage, multi device DC-DC boost converter using improved switched inductor technique for solar PV application, wherein the overall size of the converter can be minimized.
[0016] Another object of the present invention is to provide high gain multi stage, multi device DC-DC boost converter using improved switched inductor technique for solar PV application, wherein even with the addition of extra passive components to boost the output voltage and ultimately results in a lighter design.
[0017] The foregoing and other objects of the present invention will become readily apparent upon further review of the following detailed description of the embodiments as illustrated in the accompanying drawings.
SUMMARY OF THE INVENTION
[0018] The present invention relates to high gain multi stage, multi device DC-DC boost converter using improved switched inductor technique for solar PV application. In this new converter an improved switched inductor with multi stage structure is invented. From its state space analysis, parameters such as inductor, capacitor, o/p voltage for i/p voltage 24v, output current for 200 w power calculated. Then its simulation being done. From simulation it is cleared that that this converter is best in comparison to other existing converter with respect to voltage gain, O/P voltage, less size of components than other existing one .All this achieved with minimal duty ratio.
[0019] MODE 1: During this sub-interval, the switch S1 gets switched ON and switch S2 gets switched OFF as shown in above fig. The inductors (L1, L2) in L- impedance network charges in parallel and get charged from source voltage Vin. The capacitor discharges through switch (MOSFET) S1 to load. So, the inductor current (IL1, IL2) starts linearly increasing.
[0020] MODE 2: In the above mode of operation as both the switches S1 and S2 are in turned OFF condition, during this sub-interval. The L-impedance network inductors (L1, L2) discharges in series with the source voltage Vin and is supplied to load.
[0021] MODE-3: In this sub-interval as shown in the switch S2 remains in switched ON condition while switch S1 remains in switched OFF condition. The L- impedance network inductors (L1, L2) start charging from the input voltage Vin. Then, the inductor current IL1, IL2, linearly increases.
[0022] MODE-4: In this sub-interval mode, both the switches S1 and S2 remain in turned OFF condition. The L-impedance inductor (L1, L2) discharges in series with the input voltage source Vin and load. So the inductor current (IL1, IL2) decreases
[0023] Four basic concepts can be used to guide the integration of energy storage components, such as inductors and capacitors, with a diode and switch to create boost converter topologies based on impedance networks.
- Principle 1: Inductors and capacitors are charged from the power source in parallel and discharged to the load in series to increase the voltage gain (VG).
- Principle 2: Energy is transmitted between the capacitors when the switch is closed; when the switch is open, the power source and the capacitors both deliver energy to the load simultaneously, raising VG.
- Principle 3: An inductor can be used in place of the diode to raise VG without violating any circuit laws.
- Principle 4: Incorporating a capacitor into the impedance network diminishes the voltage stress (VS) on the component, constructing a circuit loop with a, diode, switch and load.
[0024] From simulation it is cleared that that this converter is best in comparison to other existing converter with respect to voltage gain, O/P voltage, less size of components than other existing one .All this achieved with minimal duty ratio.
[0025] While the invention has been described and shown with reference to the preferred embodiment, it will be apparent that variations might be possible that would fall within the scope of the present invention.
BRIEF DESCRIPTION OF DRAWINGS
[0026] So that the manner in which the above-recited features of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may have been referred by embodiments, some of which are illustrated in the appended drawings. It is to be noted, however, that the appended drawings illustrate only typical embodiments of this invention and are therefore not to be considered limiting of its scope, for the invention may admit to other equally effective embodiments.
[0027] These and other features, benefits, and advantages of the present invention will become apparent by reference to the following text figure, with like reference numbers referring to like structures across the views, wherein:
[0028] Fig. 1 Proposed Topology and its modes of operation - mode 1, 2, 3 and 4.
[0029] Fig. 2 Novel high gain single-switch DC-DC buck- boost converter with continuous input and output power (NISBb).
[0030] Fig. 3 Single-switch boost-buck converter (SSBb).
[0031] Fig. 4 Comparison result analysis.
[0032] Fig. 5 Simulation result of output voltage.
DETAILED DESCRIPTION OF THE INVENTION
[0033] While the present invention is described herein by way of example using embodiments and illustrative drawings, those skilled in the art will recognize that the invention is not limited to the embodiments of drawing or drawings described and are not intended to represent the scale of the various components. Further, some components that may form a part of the invention may not be illustrated in certain figures, for ease of illustration, and such omissions do not limit the embodiments outlined in any way. It should be understood that the drawings and the detailed description thereto are not intended to limit the invention to the particular form disclosed, but on the contrary, the invention is to cover all modifications, equivalents, and alternatives falling within the scope of the present invention as defined by the appended claim.
[0034] As used throughout this description, the word "may" is used in a permissive sense (i.e. meaning having the potential to), rather than the mandatory sense, (i.e. meaning must). Further, the words "a" or "an" mean "at least one" and the word "plurality" means "one or more" unless otherwise mentioned. Furthermore, the terminology and phraseology used herein are solely used for descriptive purposes and should not be construed as limiting in scope. Language such as "including," "comprising," "having," "containing," or "involving," and variations thereof, is intended to be broad and encompass the subject matter listed thereafter, equivalents, and additional subject matter not recited, and is not intended to exclude other additives, components, integers, or steps. Likewise, the term "comprising" is considered synonymous with the terms "including" or "containing" for applicable legal purposes. Any discussion of documents, acts, materials, devices, articles, and the like are included in the specification solely for the purpose of providing a context for the present invention. It is not suggested or represented that any or all these matters form part of the prior art base or were common general knowledge in the field relevant to the present invention.
[0035] In this disclosure, whenever a composition or an element or a group of elements is preceded with the transitional phrase "comprising", it is understood that we also contemplate the same composition, element, or group of elements with transitional phrases "consisting of", "consisting", "selected from the group of consisting of, "including", or "is" preceding the recitation of the composition, element or group of elements and vice versa.
[0036] The present invention is described hereinafter by various embodiments with reference to the accompanying drawing, wherein reference numerals used in the accompanying drawing correspond to the like elements throughout the description. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiment set forth herein. Rather, the embodiment is provided so that this disclosure will be thorough and complete and will fully convey the scope of the invention to those skilled in the art. In the following detailed description, numeric values and ranges are provided for various aspects of the implementations described. These values and ranges are to be treated as examples only and are not intended to limit the scope of the claims. In addition, several materials are identified as suitable for various facets of the implementations. These materials are to be treated as exemplary and are not intended to limit the scope of the invention.
[0037] The present invention relates to high gain multi stage, multi device DC-DC boost converter using improved switched inductor technique for solar PV application. In this new converter an improved switched inductor with multi stage structure is invented. From its state space analysis, parameters such as inductor, capacitor, o/p voltage for i/p voltage 24v, output current for 200 w power calculated. Then its simulation being done. From simulation it is cleared that that this converter is best in comparison to other existing converter with respect to voltage gain, O/P voltage, less size of components than other existing one .All this achieved with minimal duty ratio.
[0038] MODE 1: During this sub-interval, the switch S1 gets switched ON and switch S2 gets switched OFF as shown in above fig. The inductors (L1, L2) in L- impedance network charges in parallel and get charged from source voltage Vin. The capacitor discharges through switch (MOSFET) S1 to load. So, the inductor current (IL1, IL2) starts linearly increasing.
[0039] MODE 2: In the above mode of operation as both the switches S1 and S2 are in turned OFF condition, during this sub-interval. The L-impedance network inductors (L1, L2) discharges in series with the source voltage Vin and is supplied to load.
[0040] MODE-3: In this sub-interval as shown in the switch S2 remains in switched ON condition while switch S1 remains in switched OFF condition. The L- impedance network inductors (L1, L2) start charging from the input voltage Vin. Then, the inductor current IL1, IL2, linearly increases.
[0041] MODE-4: In this sub-interval mode, both the switches S1 and S2 remain in turned OFF condition. The L-impedance inductor (L1, L2) discharges in series with the input voltage source Vin and load. So the inductor current (IL1, IL2) decreases
[0042] Four basic concepts can be used to guide the integration of energy storage components, such as inductors and capacitors, with a diode and switch to create boost converter topologies based on impedance networks.
- Principle 1: Inductors and capacitors are charged from the power source in parallel and discharged to the load in series to increase the voltage gain (VG).
- Principle 2: Energy is transmitted between the capacitors when the switch is closed; when the switch is open, the power source and the capacitors both deliver energy to the load simultaneously, raising VG.
- Principle 3: An inductor can be used in place of the diode to raise VG without violating any circuit laws.
- Principle 4: Incorporating a capacitor into the impedance network diminishes the voltage stress (VS) on the component, constructing a circuit loop with a, diode, switch and load.
[0043] From simulation it is cleared that that this converter is best in comparison to other existing converter with respect to voltage gain, O/P voltage, less size of components than other existing one .All this achieved with minimal duty ratio. Its simplify circuit design, reduce size and cost will make renewable energy systems more efficient and adaptable for industrial applications. Its switch inductor technology emerges as particularly suitable for integrating fuel cells into Electric Vehicles (EVs), micro grids, or other relevant applications.
- 1.High voltage gain can be achieved with minimal duty ratio
- 2.Overall size of the converter can be minimized
- 3.Less expensive
- 4.With less conduction loss becomes an efficient one
[0044] Various modifications to these embodiments are apparent to those skilled in the art from the description and the accompanying drawings. The principles associated with the various embodiments described herein may be applied to other embodiments. Therefore, the description is not intended to be limited to the 5 embodiments shown along with the accompanying drawings but is to be providing the broadest scope consistent with the principles and the novel and inventive features disclosed or suggested herein. Accordingly, the invention is anticipated to hold on to all other such alternatives, modifications, and variations that fall within the scope of the present invention and appended claims.
, Claims:CLAIMS
We Claim:
1) A high-gain DC-DC boost converter for solar photovoltaic (PV) applications, the converter comprising:
- a multi-stage structure with a switched inductor network comprising inductors L1L1L1 and L2L2L2, configured to increase voltage gain;
- at least two switches S1S1S1 and S2S2S2, configured to control the operation of the switched inductor network in a multi-mode sequence;
- a capacitor arranged to store and discharge energy in coordination with the switched inductor network, supplying a boosted output voltage with minimal duty cycle;
- wherein the multi-stage structure, controlled by the switching operation of S1S1S1 and S2S2S2, allows the inductors to charge from an input voltage in parallel and discharge in series to the load, achieving a high voltage gain with reduced component size and conduction losses.
2) The converter as claimed in claim 1, wherein the switched inductor network operates in four modes, each mode defined by the sequential operation of switches S1S1S1 and S2S2S2, allowing the inductors L1L1L1 and L2L2L2 to either charge in parallel or discharge in series, based on the input voltage.
3) The converter as claimed in claim 1, wherein the multi-stage structure of the switched inductor network enables reduced voltage stress on the components, thereby optimizing circuit efficiency and reducing component costs.
4) The converter as claimed in claim 1, wherein the configuration of the inductors and capacitors provides high voltage gain with a minimal duty cycle, making it suitable for applications in renewable energy systems such as electric vehicles (EVs) and microgrids.

Documents