Output DC-DC Converter Research Articles

Non-isolated multiple input multilevel output DC-DC converter for hybrid power system

<p><span>The utilization of multisources of energy in a compact and an effective power system gains an essential role in power electronic industry. As such, the design and simulation of a new non-isolated Multiple Input Multilevel Output (MIMLO) DC-DC converter for hybrid power system is presented. The MIMLO DC-DC converter can be integrated in renewable energy, such as fuel cells, wind turbines and photovoltaic arrays etc, to get the best output voltages. The MIMLO DC-DC converter powers the load from renewable energy sources through the independence of the availability of other sources. The proposed topology has been simulated by using MATLAB/Simulink software to testify the performance control operation of the Multiple Input Multilevel Output DC-DC converter. The results of the carried-out simulation favor the usage of multi-input voltage, rather than a single input voltage. The MIMLO design has the advantages of a simple configuration, reduced number of switches, fewer components, high efficiency, and high conversion ratio. The Multilevel Output DC-DC converter provides high voltage transfer with low size inductors, reduction of losses, low stress voltage on switches and diodes. </span></p>

Multiple output dc-dc converter derived from Cock-Croft Walton voltage multiplier and SIMO converter

Multiple output dc-dc converter derived from Cock-Croft Walton voltage multiplier and SIMO converter

Fuzzy Controlled Multiple Output Dc to Dc Flyback Converter with Output Voltage Regulation

The aim of this paper is to design and closed loop control implementation of a DC to DC Flyback converter with multiple output features. DC-DC Conversion technology is the major subject area in the field of power electronics engineering and drives and has been under development form six decades. Most of the advance systems like telecommunication and computer systems use the single output DC-DC Converter for different levels of voltage in the same system, which limits the efficiency, power density and increases the cost of the whole system. To achieve the features like high efficiency and high density for advance systems Multiple Output DC-DC Converter (MODC) are gathering much attention, and most of the research work is going to get the regulated multiple outputs, for different application like computer, electric vehicles, aircrafts etc. A MATLAB/Simulink model of a Multiple Output Flyback Converter (MOFC) is developed to get the regulated multiple output voltage. Two different control techniques have been employed such as Proportional Integral Derivative Control (PIDC) and Fuzzy Logic Control (FLC), to achieve the same for normal and disturbances cases and its performance is then estimated in terms of various parameters like Rise Time (Tr), Settling Time (Ts) and Overshoot (OS). The comparative results clearly reveal the better response of the proposed approach.

リプルレギュレータ方式による 単インダクタ2出力DC-DC電源

リプルレギュレータ方式による 単インダクタ2出力DC-DC電源

Enhanced Boost Converter Fed Asymmetrical Cascaded -MLI for 3 Induction Motor

modern days more research works are going in the field of a non conventional source based power supply generation for interfacing low potential into high potential. Coupled inductor based Enhanced Boost Converter is proposed in this article. The passive clamp circuit is used to recycle the leakage energy and increase potential gain and less loss. Thus the proposed converter has maximum potential gain and efficiency due to coupled inductor and clamp circuit. This dc-dc converter output is given to hybrid multilevel inverter. The proposed Enhanced Boost Converter fed hybrid multilevel inverter is developed for interfacing low potential dc source into high potential AC.

Fuzzy-Suboptimal Mode MPPT Control for Three-Phase Grid-Connected PV

In order to maximize the conversion efficiency of a photovoltaic generator a maximum power point controller is used. In this paper, a new suboptimal sliding mode control is designed to maximize the energy delivered by a photovoltaic chain connected to a three-phase electrical grid. The proposed control law ensures a stable DC-DC converter output power and a three-phase grid voltage source inverter control is used to regulate the DC link voltage. The performances of the proposed controller are verified through simulation and the injection of zero reactive energy is guaranteed.

Grid Connected Distributed Generation System with High Voltage Gain Cascaded DC-DC Converter Fed Asymmetric Multilevel Inverter Topology

The paper presents distributed generation (DG) system in grid connected mode of operation with asymmetric multi-level inverter (AMLI) topology. Cascaded type DC-DC converter is employed to feed proposed AMLI topology. The DG output voltage (generally low voltage) is stepped up to the required level of voltage using high-gain DC-DC converter. Proposed AMLI topology consists of capacitors at the primary side. The output of high-gain DC-DC converter is fed to split voltage balance single-input multi-output (SIMO) circuit to maintain voltage balance across capacitors of AMLI topology. Cascaded DC-DC converters (both high-gain converter and SIMO circuit) are operated in closed-loop mode. The proposed AMLI feeds active power to grid converting DC type of power generated from DG to AC type to feed the grid. PWM pattern to trigger power switches of AMLI is also presented. The inverting circuit of MLI topology is controlled using simplified Id-Iq control strategy in this paper. With the proposed control theory, the active power fed to grid from DG is controlled and power factor is maintained at unity. The proposed system of DG integration to grid through cascaded DC-DC converters and AMLI structure is validated from fixed active power to grid from DG condition. The proposed system is developed and results are obtained using MATLAB/SIMULINK software.

High Frequency Link Power Conversion System for Fuel cell Applications

In this paper an empirical model of the air breathing (ABFC) is proposed to investigate the cell voltage verses current density characteristics and harnessing of maximum energy from natural resource whenever it’s available. The power electronic converters role is important in between source and load. Proper controller can switch the converter in the desired time and improve the system performance and stability. The mathematical model of the ABFC is built in MATLAB/Simulink. The proposed system also has boost converter, bidirectional DC-DC converter and inverter for grid and energy integration. The boost inverter/buck rectifier in this system is controlled by ANFIS controller is for better output, boost and bidirectional DC-DC converters are controlled by PID controller in closed loop. Overall operations are based on modes main controller, which control the system operation in different modes. Any variations happening in the input, storage and load parameters, the controller changes the mode and operates the system in effective way.

Grid Integrated Wind Energy Storage System for Linear and non-Linear Loads

The proposed system also has boost converter, bidirectional DC-DC converter and inverter for grid and wind energy integration. The boost inverter/buck rectifier in this system is controlled by ANFIS controller is for better output, boost and bidirectional DC-DC converters are controlled by PID controller in closed loop. Overall operations are based on modes main controller speedgoat, which is control the system operation in different modes. Any variation happening in the input, storage and load parameters speedgoat changing the mode and operate the system is in effective way. This paper presents harnessing of maximum wind energy from natural resource whenever it’s available. The power electronic converters role is important In between sources and load. The load may be linear and non-linear in nature, so converters performance decides the efficiency of the system. Proper controller can switch the converter in the desired time and improve the system performance and stability. Many controllers are suggests to control the converter to get better performance in at output side.

DC–DC buck converter solely powered by supercapacitors for efficiently powering the hand‐held devices

In this study, a closed loop feed-forward direct current (DC)-DC converter has been designed which operates solely on two supercapacitor modules. This is an innovative new design where the challenge was to maintain the constant output voltage when the input voltage of the converter is decaying continuously as a function of time as long as the output load draws current. The second innovation is the selection of all the components that are required to design the regulated output DC-DC converter, even though the parameters like the supply voltages for the components have been falling continuously as a function of time since the supercapacitor modules are providing these supply voltages. The design is also robust enough to withstand certain fluctuations in the output current ranging between 200 and 950 mA and yet maintain a regulated output voltage. In this study, the authors have successfully demonstrated that one can design a DC-DC converter powered by supercapacitors to generate a constant voltage and desired output current while all the components required making that DC-DC converter remain operational although the input voltage of the supercapacitors is dropping constantly, due to the output drawing current. The operating frequency, i.e. the switching frequency ranges from 1.5 to 3.5 kHz.

An Adaptive and Wide-Range Output DC-DC Converter for Loading Circuit of Li-Ion Battery Charger

In this paper, an adaptive and wide-range output DC-DC converter designed for lithium-ion (Li-Ion) battery charger circuit is proposed. The converter operates in continuous conduction mode (CCM) to provide an output voltage in response to battery voltage and a wide-range output current to ensure that circuit requirements are met. This circuit is designed on Cadence using 0.35-um BCD technology. Simulation results show that the circuit fully operates in CCM mode with a load current from 50 mA to 1000 mA and output voltage ripple factor is less than 1 %. Furthermore, the current supplied to the load circuit responses to three types of Li-Ion rechargeable currents. The output voltage of the converter varies from 2.8 to 4.5 V corresponding to the voltage range of the battery being charged from 2.5 to 4.2 V. The average power efficiency of the converter in large load current mode (1000 mA) reaches 94 %.

Power quality improvement in switched mode power supplies using two stage DC-DC converter

This paper deals with an improved power quality multiple output switched mode power supply (SMPS) using two stage DCDC converter. A non-isolated buck-boost DC-DC converter is used as the first stage whereas single ended primary inductance converter (SEPIC) is used in the second stage. The first stage of buck-boost converter is designed in discontinuous conduction mode (DCM) for inherent power factor (PF) correction. Design and simulations of the two stage DC-DC converter with load variations on the SMPS are performed in MATLAB software to demonstrate the effectiveness of the multiple output DC-DC converter to have a stiff voltage regulation and negligible ripple.Keywords: DC-DC converter; Two stage; PFC; THD; Buck-boost converter; SEPIC; SMPS; Power quality

Robust decentralized controller for minimizing coupling effect in single inductor multiple output DC-DC converter operating in continuous conduction mode

This paper describes a novel robust decentralized control design methodology for a single inductor multiple output (SIMO) DC-DC converter. Based on a nominal multiple input multiple output (MIMO) plant model and performance requirements, a pairing input-output analysis is performed to select the suitable input to control each output aiming to attenuate the loop coupling. Thus, the plant uncertainty limits are selected and expressed in interval form with parameter values of the plant model. A single inductor dual output (SIDO) DC-DC buck converter board is developed for experimental tests. The experimental results show that the proposed methodology can maintain a desirable performance even in the presence of parametric uncertainties. Furthermore, the performance indexes calculated from experimental data show that the proposed methodology outperforms classical MIMO control techniques.

Design, Fabrication and Performance Analysis of a Two Input—Single Output DC-DC Converter

A novel modified bridge-type dual input DC-DC converter, which is proficient for integrating distinct V-I characteristic sources such as solar-PV, wind, etc., and storages including battery, ultracapacitor, fuel cell, etc., is proposed in this paper. Three modes of operations such as boost, buck, and buck-boost are possible using the same structure of the converter, and the converter can operate even with the failure of any one of the input energy sources to deliver power to the load. A software simulation and experimental realization of the converter have been carried out for the buck, boost, and buck-boost operations. The voltage and current stress analysis of the power switches available in the converter have been carried out for the better selection of power switches. A simple power control strategy is proposed for the steady state, and dynamic performance analysis of the converter and performance comparison with existing converter topologies have been carried out based on the different parameters like duty ratio, efficiency, etc. The performance comparison shows that the proposed converter has high voltage gain, low voltage stress, reduced part counts and high efficiency.

Golden section search based maximum power point tracking strategy for a dual output DC-DC converter

Abstract This paper introduces an Golden Section Search based algorithm, along with an single input multi output DC-DC converter for photovoltaic systems. In contemplation for photovoltaic (PV) systems to escalate their efficiency of power generation, it is mandatory to locate the Maximum power point (MPP) under all possible illumination conditions. Maximum power point tracking (MPPT) controller is expected to obtain the MPP irrespective of the device and climatic changes. The basic principle and the implementation of the system is elaborated in this paper, along with an comparison of different hill-climbing algorithms. The analytic and simulated results show that the new method has the advantages of fast convergence, noise-resistance, and robustness.

Dual Output DC-DC converter Based on CUK and SEPIC

Dual Output DC-DC converter Based on CUK and SEPIC

Single Switched Non-isolated High Gain Converter

<p>This paper presents a new single switched inductor- capacitor coupled transformer-less high gain DC-DC converter which can be used in renewable energy sources like PV, fuel cell in which the low DC output voltage is to be converted into high dc output voltage. With the varying low input voltages, the output of DC-DC converter remains same and does not change. A state space model of the converter is also presented in the paper. This constant output voltage is obtained by close loop control of converter using PID controller. High voltage gain of 10 is obtained without use of transformer. All the simulations are done in MATLAB-SIMULINK environment.</p>

Modelling and Simulation of Photovoltaic System Fed Two Input Two Output DC-DC Boost Converter Interfaced with Asymmetric Cascaded H-Bridge Multilevel Inverter

Objectives: Multiple Input Multiple Output dc-dc boost converters is used to interface diversified renewable energy sources to Asymmetric Cascaded H-Bridge Multilevel Inverter whose output voltages can be connected to the grid system. The compensators and/or controllers are required to provide the constant output voltages of the boost converter against disturbances along with desired time domain specifications. In this paper, two input two output dc-dc boost converter is developed to interface with seven level multilevel inverter. Methods/Statistical Analysis: One of the input sources is replaced by Photovoltaic panel and Incremental Conductance based Maximum Power Point Tracking Algorithm is developed to improve the efficiency of the system. Compensators are designed to maintain the constant output voltages of the converter against disturbances using transfer function model obtained from developed small signal model of the converter. The developed system is simulated using MATLAB /Simulink and the total harmonic distortion in the output voltage of the inverter is observed .The simulated closed loop output voltages of the dc-dc converter are validated by developing prototype model of the converter using AT 89C51 microcontroller. Findings: It is found that the two input two output dc-dc converter provides constant dc voltages to the asymmetric multilevel inverter from the diversified energy sources with improved time domain specifications using compensators. Application/Improvements: The designed system is having the applications in renewable power system, aerospace power systems and hybrid energy vehicle.

A new approach for minimizing torque ripple in a BLDC motor drive with a front end IDO dc-dc converter

This paper proposes a front end integrated dual output (IDO) dc-dc converter for commutation torque ripple reduction in a permanent magnet brushless DC (BLDC) motor drive. The current ripple owed to the inductance and resistance of the motor during commutation instant results in torque ripple. In this work the dc link voltage of the converter is varied at commutation instants to minimize current ripple and hence torque ripple. The wider output range and faster response of the IDO converter make it a suitable choice as a front end converter for minimizing torque ripple. Simulation results validate the proposed converter for the BLDC motor drive. Experimental analysis of a conventional drive is performed to verify the simulation results.

High-Voltage DC-DC Converter Topology for PV Energy Utilization—Investigation and Implementation

This paper exploited the utilization of photovoltaic (PV) energy system with high-voltage (HV) output DC-DC converter. Classical boost converters are used for both renewable energy integration and HV applications, but limited by reducing output/efficiency in performance. Moreover, as parasitic elements suppress the power transfer ratio, converter needs to maximize the PV energy utilization. This investigation study focused to include additional parasitic elements (voltage-lift technique) to a standard DC-DC buck converter and to overcome all the above drawbacks to maximize the PV power generation. The proposed power circuitry substantially improves the output power gain transfer ratio and a prototype hardware module is implemented using industrial standard DSP TMS 320F2812. Numerical simulation development followed by an experimental prototype implementation is carried out in this investigation. A set of numerical and experimental results is provided in this paper, which show close conformity with the theoretical background.