Development Of DC-DC Converter Research Articles

A Comprehensive Review of Various Isolated DC-DC Converters Topologies Associated with Photovoltaic Applications

Abstract: Environmentally friendly renewable energy sources showed substantial development over the most recent couple of years. Compared with other RES, extracting power from solar has become the most beneficial and profitable source because of its environmental friendly nature. In the process of extraction of power, DC-DC converters has given conspicuous interest due to their broad use in various applications. Although a lot of advancements, research work, and continuous tuning of circuits of photovoltaic systems, still remarkable efficiency and stability has not been achieved yet. In this paper, exhaustive research and development of DC-DC converters are identified and studied. It surveys the difficulties associated with implementing new converter topologies in photovoltaic applications. Presented new topologies that have simpler control, less number of components, economical, and suitable for solar applications. Various types of isolated converter are explained such as different bidirectional converters, high step- up converters, zero current switching, high frequency isolated converter, isolated converter with discontinuous input, quasi-Z-source converter, multiport converter, high efficient converter, single-switch converter and single-switch resonant converter. Different types of structure characteristics and operation of the converters are presented. Based on the distinct features, a comparison of the converters has been carried out. From the review, a single converter topology does not fulfill all requirements in the industry. Future scopes of the research trend are suggested. The current survey is to update the research carried out during the time gap.

A Novel Boost-Buck Converter Architecture for Improving Transient Response and Output-Voltage Ripple

Buck-boost converters are widely used in the development of DC-DC converters. Several techniques and algorithms have been introduced to improve the transient response of buck-boost converters. However, due to the opposite trends of the output current change and the output voltage change, undershoot or overshoot in the output voltage still seems to be inevitable. In order to overcome this problem, a novel boost-buck converter architecture is proposed to build a fast transient response DC-DC converter. The converter consists of a cascaded configuration of the boost and buck stages. The boost stage converts the input voltage to the shared capacitor voltage and the buck stage supplies energy to the load by converting the shared capacitor voltage to the output voltage. By harnessing the energy stored in the shared capacitor, the transient response of the boost buck converter can be improved to 2 µs in a step-up load current change of 1 A with an output-voltage ripple of 15 mV.

Performance evaluation of PI controller for positive output Luo converter

The aim of this work is to design and analyze a Proportional Integral (PI) controller for Positive Output Luo Converter applications. Positive Output Luo Converter is a developed DC-DC converter. It is respected as a right choice for most industrial application where the rate of the output load voltage must be varying between the low and high values of the input value of voltage, output voltage rise and fall is smaller. This converter involve Power electronics switches (Diodes and MOSFET) since these elements are non-linear. The detailed model includes high-frequency switching that is introducing discontinuities into the model. PI controller coefficients (kp, ki) are calculated by particle swarm optimization (PSO) to provide optimal PI as hybrid PI by PSO controller with simple design procedure .Transient and steady state responses requirement of the system are considered in designing the proposed PI controller. The consequences show that the time of performing characteristics of PSO-PI controller established on integral squared error (ISE) performance index has the best time performing characteristics, line disturbance, load disturbance and set point variation.

Maximum Power Point Tracking for Brushless DC Motor-Driven Photovoltaic Pumping Systems Using a Hybrid ANFIS-FLOWER Pollination Optimization Algorithm

In this research paper, a hybrid Artificial Neural Network (ANN)-Fuzzy Logic Control (FLC) tuned Flower Pollination Algorithm (FPA) as a Maximum Power Point Tracker (MPPT) is employed to amend root mean square error (RMSE) of photovoltaic (PV) modeling. Moreover, Gaussian membership functions have been considered for fuzzy controller design. This paper interprets the Luo converter occupied brushless DC motor (BLDC)-directed PV water pump application. Experimental responses certify the effectiveness of the suggested motor-pump system supporting diverse operating states. The Luo converter, a newly developed DC-DC converter, has high power density, better voltage gain transfer and superior output waveform and can track optimal power from PV modules. For BLDC speed control there is no extra circuitry, and phase current sensors are enforced for this scheme. The most recent attempt using adaptive neuro-fuzzy inference system (ANFIS)-FPA-operated BLDC directed PV pump with advanced Luo converter, has not been formerly conferred.

Closed Loop Control of Positive Output Re-Lift Luo Converter with PSO and Cuckoo Techniques

Positive output Re-lift luo converter is a recently developed DC-DC converter which performs the conversion from positive source voltage to positive load voltage and are used in computer peripherals, dc drives, industries and other high voltage projects.Voltage lifting technique is employed and hence the output voltage increases in an arithmetic progression unlike classical boost converter. This paper presents the closed loop control of positive output re-lift luo converter with PI controller.PI controller is capable of providing good static and dynamic performances and can be used to analyze the system performance under disturbances.Control algorithm such as Cuckoo and Particle Swarm Optimization are implemented to track output voltage with respect to the reference voltage.These optimization techniques rejects the system disturbances at line and load side, hence steady state can be reached with less overshoot and settling time.The simulation model of the proposed converter is implemented in Matlab/Simulink and Cuckoo technique is compared over PSO.

Performance Evaluation of Positive Output Switched Capacitor Elementary Luo Converter with PI and Fuzzy Controllers

This paper presents simulation of PI and fuzzy logic controllers for a positive output switched capacitor elementary Luo converter which is a newly developed DC-DC converter. This combines both switched capacitor and voltage lift techniques. .Due to the time-varying and switching nature of the power electronic converters, their dynamic behavior becomes highly non-linear. Conventional controllers are incapable of providing good dynamic performance and hence fuzzy logic controller can be utilized as a feed forward controller for controlling power electronic converters. The control algorithm is developed in this work to ensure tracking of the reference voltage and rejection of system disturbances by successive measurements of the converter output voltage at certain time instants within a conduction period. The main objective is simulation of PI and fuzzy logic controls using MATLAB (version 7.0.1) software to evaluate the controller’s performances. The simulation results show that fuzzy controller performs better for the chosen converter.

Performance Analysis of Positive Output Super-Lift Re-Lift Luo Converter With PI and Neuro Controllers

DC-DC converters are widely used in computer peripheral equipments and industrial applications. Luo converter is a recently developed DC-DC converter. Positive output Luo converter performs the conversion from positive source voltage of one level to positive load voltage of another required level This paper presents simulation of PI and neuro controllers for a positive output super-lift re-lift DC-DC converter. Super lift converters make the output voltage increasing in geometric progression. They are different from any other existing DC-DC converters and possess many advantages including very high output voltage with small ripples. Therefore these converters will be widely used in industrial applications especially for very high voltage projects. Control algorithm is developed in this work to ensure tracking of the reference voltage and rejection of system disturbances by successive measurements of the converter output voltage at certain time instants within a conduction period. The main objective is simulation of PI and neuro controllers using MATLAB (version 7.1) software and evaluate the controller’s performances. The simulation results show that neuro controller provides quicker settling of output whereas PI controller creates less over shoot.

A novel soft-switching PWM DC-DC converter with high-frequency transformer link and its open loop regulation characteristics.

In the practical requirement for high-efficiency, high power density and high-performance in the switched-mode power supplies and their related application systems, a variety of circuit topologies of DC-DC converters incorporating soft-switching PDM, PFM and PWM control schemes have attracted special interest in the fields of low power and high power applications. Some types of quasi-resonant soft-switching PWM converters have remarkable advantages such as lowered switching losses of power semiconductor devices, reduced dynamic electrical stresses, constant frequency operation, simple control scheme as well as reduced EMI noise.However, most of soft-switched quasi-resonant PWM converters developed so far include some inherent items which have to be solved such as reduced power conversion efficiency due to significant circulating current generation. In recent years, the newly modified prototype of soft-switched PWM DC-DC converter with a high-frequency transformer link has been proposed, which is capable of excluding circulating current operation mode.This paper presents a novel high-frequency transformer link soft-switching PWM DC-DC converter using active switches in rectifier circuit. Its operating principle and unique features are described as compared with the previously developed DC-DC converter. Operating performance of this converter in steady-state are illutrated and disccused including the simulated analytical and experimental results.