scispace - formally typeset
Search or ask a question
Proceedings ArticleDOI

High gain hybrid DC-DC converter

16 Oct 2014-pp 218-222
TL;DR: In this paper, a single switch high gain DC-DC converter which is a combination of coupled inductor and voltage multiplier cells (VMCs) is proposed to achieve high step up gain by using appropriate duty cycle and the turns ratio of the coupled inductors.
Abstract: The output voltage from renewable energy sources like photovoltaic cell or array will be at low level. This must be stepped up by an order of around 20 for practical applications or grid connection. Series connection of arrays is not a viable solution. The proposed DC-DC converter topology consists of a novel single switch high gain DC-DC converter which will be a combination of coupled inductor and voltage multiplier cells (VMCs). The approach is to achieve high step up gain by using appropriate duty cycle and the turns ratio of the coupled inductor. This is done by charging the two capacitors in parallel and discharging them in series via a coupled inductor. The voltage multiplier cell operates as regenerative circuit reducing the problems with layout. These characteristics allow the operation with high efficiency and high static gain.
Citations
More filters
Book ChapterDOI
01 Jan 2021
TL;DR: In this article, a high gain DC-DC converter for low voltage solar PV system for highvoltage applications which can be used as a DC link voltage of modular multilevel converter (MMC) is presented.
Abstract: Solar photovoltaic (PV) is one of the most emerged and widely used alternative source of energy that can support existing conventional sources of energy used in electrical power generation to a larger extent. At present, grid connected solar PV systems are used extensively, but standalone solar PV system plays a very important role in providing electric power to the places where power grid is not available (e.g., some villages located at remote places and remote islands). It can also be used in standalone mode for applications such as toys, calculator, electric vehicle, space crafts, and satellites. This paper presents high gain DC-DC converters which enables the use of low voltage solar PV system for high-voltage applications which can be used as a DC link voltage of modular multilevel converter (MMC). It minimizes the effect of changing weather conditions which continuously changes solar irradiance by varying duty cycle. Simulation of the converter is carried out by using MATLAB/Simulink software under constant load condition and by varying the load at the output.

5 citations

Proceedings ArticleDOI
01 Sep 2017
TL;DR: The three level hybrid boost dc-dc converter is put forward, which can step-up the fuel cell output voltage with high voltage gain and is based on the traditional neutral clamped multi level inverter.
Abstract: The increasing consumption of conventional energy in the world with increasing costs of fossil fuel is justifiable reason for using fuel cell technology with high performance. However, the output voltage of fuel cell stack is very low and it is not sufficient to drive the electric vehicle. This paper put forward the three level hybrid boost dc-dc converter, which can be step-up the fuel cell output voltage with high voltage gain. The working principle of present converter is based on the traditional neutral clamped multi level inverter. Here, IGBT based three level converter is designed and steady state of filtering capacitors are observed with MATLAB software. Fuel cell stack is designed in the place of normal dc battery. Hybrid boost dc-dc converter is connected to Multi level inverter for AC output to drive EV. Finally, the simulation results are discussed.

1 citations


Cites methods from "High gain hybrid DC-DC converter"

  • ...So, the dc to dc converters with high voltage gain are used [2]....

    [...]

Proceedings ArticleDOI
22 Sep 2022
TL;DR: In this paper , a hybrid converter for micro-grid application is proposed, which consists of a solar PV as a DC source, and a storage battery to power a local DC load.
Abstract: This article, presents a hybrid converter for micro-grid application is proposed. It consists of a Solar PV as a DC source, and a storage battery to power a local DC load. The proposed converter is a simple circuit that integrated a bidirectional half-bridge DC-DC converter and a boost converter to perform charging, discharging of storage battery, and MPPT control respectively. The MPPT control for solar PV is achieved using Perturb and Observe method. A closed-loop control system is developed using PI control to charge and Discharge the battery. This DC micro-grid is integrated with the grid system and the performance of the converter is evaluated using MATLAB/Simulink software. In comparison to existing converters, the proposed converter has a lower number of power components and achieved an efficiency of 95.7%.
Proceedings ArticleDOI
22 Sep 2022
TL;DR: In this paper , a hybrid converter for micro-grid application is proposed, which consists of a solar PV as a DC source, and a storage battery to power a local DC load.
Abstract: This article, presents a hybrid converter for micro-grid application is proposed. It consists of a Solar PV as a DC source, and a storage battery to power a local DC load. The proposed converter is a simple circuit that integrated a bidirectional half-bridge DC-DC converter and a boost converter to perform charging, discharging of storage battery, and MPPT control respectively. The MPPT control for solar PV is achieved using Perturb and Observe method. A closed-loop control system is developed using PI control to charge and Discharge the battery. This DC micro-grid is integrated with the grid system and the performance of the converter is evaluated using MATLAB/Simulink software. In comparison to existing converters, the proposed converter has a lower number of power components and achieved an efficiency of 95.7%.
References
More filters
Journal ArticleDOI
TL;DR: The superiority of the new, hybrid converters is mainly based on less energy in the magnetic field, leading to saving in the size and cost of the inductors, and less current stresses in the switching elements, lead to smaller conduction losses.
Abstract: A few simple switching structures, formed by either two capacitors and two-three diodes (C-switching), or two inductors and two-three diodes (L-switching) are proposed. These structures can be of two types: ldquostep-downrdquo and ldquostep-up.rdquo These blocks are inserted in classical converters: buck, boost, buck-boost, Cuk, Zeta, Sepic. The ldquostep-downrdquo C- or L-switching structures can be combined with the buck, buck-boost, Cuk, Zeta, Sepic converters in order to get a step-down function. When the active switch of the converter is on, the inductors in the L-switching blocks are charged in series or the capacitors in the C-switching blocks are discharged in parallel. When the active switch is off, the inductors in the L-switching blocks are discharged in parallel or the capacitors in the C-switching blocks are charged in series. The ldquostep-uprdquo C- or L-switching structures are combined with the boost, buck-boost, Cuk, Zeta, Sepic converters, to get a step-up function. The steady-state analysis of the new hybrid converters allows for determing their DC line-to-output voltage ratio. The gain formula shows that the hybrid converters are able to reduce/increase the line voltage more times than the original, classical converters. The proposed hybrid converters contain the same number of elements as the quadratic converters. Their performances (DC gain, voltage and current stresses on the active switch and diodes, currents through the inductors) are compared to those of the available quadratic converters. The superiority of the new, hybrid converters is mainly based on less energy in the magnetic field, leading to saving in the size and cost of the inductors, and less current stresses in the switching elements, leading to smaller conduction losses. Experimental results confirm the theoretical analysis.

1,186 citations

Journal ArticleDOI
TL;DR: In this article, a family of high-efficiency, high step-up DC-DC converters with simple topologies is proposed, which use diodes and coupled windings instead of active switches to realize functions similar to those of active clamps.
Abstract: Many applications call for high step-up DC-DC converters that do not require isolation. Some DC-DC converters can provide high step-up voltage gain, but with the penalty of either an extreme duty ratio or a large amount of circulating energy. DC-DC converters with coupled inductors can provide high voltage gain, but their efficiency is degraded by the losses associated with leakage inductors. Converters with active clamps recycle the leakage energy at the price of increasing topology complexity. A family of high-efficiency, high step-up DC-DC converters with simple topologies is proposed in this paper. The proposed converters, which use diodes and coupled windings instead of active switches to realize functions similar to those of active clamps, perform better than their active-clamp counterparts. High efficiency is achieved because the leakage energy is recycled and the output rectifier reverse-recovery problem is alleviated.

974 citations

Journal ArticleDOI
TL;DR: In this article, the use of the voltage multiplier technique applied to the classical non-isolated dc-dc converters in order to obtain high step-up static gain, reduction of the maximum switch voltage, zero current switching turn-on was introduced.
Abstract: This paper introduces the use of the voltage multiplier technique applied to the classical non-isolated dc-dc converters in order to obtain high step-up static gain, reduction of the maximum switch voltage, zero current switching turn-on. The diodes reverse recovery current problem is minimized and the voltage multiplier also operates as a regenerative clamping circuit, reducing the problems with layout and the EMI generation. These characteristics allows the operation with high static again and high efficiency, making possible to design a compact circuit for applications where the isolation is not required. The operation principle, the design procedure and practical results obtained from the implemented prototypes are presented for the single-phase and multiphase dc-dc converters. A boost converter was tested with the single-phase technique, for an application requiring an output power of 100 W, operating with 12 V input voltage and 100 V output voltage, obtaining efficiency equal to 93%. The multiphase technique was tested with a boost interleaved converter operating with an output power equal to 400 W, 24 V input voltage and 400 V output voltage, obtaining efficiency equal to 95%.

702 citations

Journal ArticleDOI
TL;DR: In this article, a high step-up converter with a coupled-inductive switch is investigated, where a passive regenerative snubber is utilized for absorbing the energy of stray inductance so that the switch duty cycle can be operated under a wide range, and the related voltage gain is higher than other coupled inductor-based converters.
Abstract: In this study, a high step-up converter with a coupled-inductor is investigated. In the proposed strategy, a coupled inductor with a lower-voltage-rated switch is used for raising the voltage gain (whether the switch is turned on or turned off). Moreover, a passive regenerative snubber is utilized for absorbing the energy of stray inductance so that the switch duty cycle can be operated under a wide range, and the related voltage gain is higher than other coupled-inductor-based converters. In addition, all devices in this scheme also have voltage-clamped properties and their voltage stresses are relatively smaller than the output voltage. Thus, it can select low-voltage low-conduction-loss devices, and there are no reverse-recovery currents within the diodes in this circuit. Furthermore, the closed-loop control methodology is utilized in the proposed scheme to overcome the voltage drift problem of the power source under the load variations. As a result, the proposed converter topology can promote the voltage gain of a conventional boost converter with a single inductor, and deal with the problem of the leakage inductor and demagnetization of transformer for a coupled-inductor-based converter. Some experimental results via examples of a proton exchange membrane fuel cell (PEMFC) power source and a traditional battery are given to demonstrate the effectiveness of the proposed power conversion strategy.

540 citations

Journal ArticleDOI
TL;DR: In this paper, a switch-capacitor (SC) circuit is integrated within a boost converter for a steep step-up of the line voltage, allowing for a boost of the input voltage to high values.
Abstract: A new circuit is proposed for a steep step-up of the line voltage. It integrates a switched-capacitor (SC) circuit within a boost converter. An SC circuit can achieve any voltage ratio, allowing for a boost of the input voltage to high values. It is unregulated to allow for a very high efficiency. The boost stage has a regulation purpose. It can operate at a relatively low duty cycle, thus avoiding diode-reverse recovery problems. The new circuit is not a cascade interconnection of the two power stages; their operation is integrated. The simplicity and robustness of the solution, the possibility of getting higher voltage ratios than cascading boost converters, without using transformers with all their problems, and the good overall efficiency are the benefits of the proposed converter.

439 citations