Abstract: A brushless DC motor when fed by uncontrolled diode bridge rectifier results in highly distorted supply current which forcing in low Power Factor and high Total Harmonic Distortion; hence zeta converter fed BLDC motor drive is proposed here. Zeta converter is fourth order DC-DC converter which is capable of operating either in step up or step down mode. A single phase AC supply is connected single phase diode bridge full wave rectifier and a Zeta converter is used to control the voltage of a DC link capacitor. DC link capacitor is connected in between the Zeta converter and Voltage Source Inverter. The Voltage of a DC link capacitor of Zeta converter is controlled to achieve the speed control of BLDC motor. The DC link capacitor of the Zeta converter is followed by a VSI which is feeding a BLDC motor. The basic zeta allows operating in Continuous Conduction Mode (CCM) without any isolation. The circuit is modified here with high frequency isolation using isolated transformer. Here Discontinuous Conduction Mode is used. The circuit model is simulated using PSIM environment. The gate pulses are generated by the feedback method using PSIM, The PWM signal generation requires only a sin wave/ saw tooth waveform and a comparator in simulation model, also can generate the required PWM by PIC16F877A in Proteus.

Abstract: A DC-DC converter based on combination of both SEPIC and CUK converter with self lifting property is proposed. In this topology, a single switch is shared by SEPIC and CUK converter. Thus control strategy required for this converter is of less complexity. Voltage gain ratio of both converters can be varied by controlling the duty ratio of single switch. Two additional components: a capacitor and a diode are used in each converter to increase the voltage transfer gain. Voltage lifting is advantageous when duty ratio required is high (usually D<0.9), because D have a practical upper limit. This converter can be used in DC bipolar network as it has a positive voltage output and a negative voltage output. Compared with the classical Cuk and SEPIC converters, the converter increases the voltage boost ability significantly using self-lift techniques. Self lifted SEPIC-CUK converter is simulated in MATLAB/SIMULINK software and comparative study with conventional SEPIC-CUK converter (with two switches) and SEPIC-CUK converter with single switch are performed.

Abstract: Multi-input power electronic converters (MIPEC) are increasingly gaining interest in the fields of renewable energy systems and hybrid electric vehicles (HEV). The main advantage of MIPECs is their ability to interface several energy sources and storage devices using a single power conversion stage. Therefore, they provide simpler control and smaller parts count. For instance, a DI buck-boost topology is proposed for a photovoltaic (PV)/battery energy system. The converter is controlled in a way that maximum power is drawn from the PV array using maximum power point tracking (MPPT) techniques and the additional power is drawn from the battery while keeping the output voltage constant. This paper presents a new charging method for ultra-capacitors. Comparing with batteries, ultracapacitor can accept a wide range of charging current and can be fully charged within a few minutes. Common chargers for ultra-capacitors are usually equipped with current transducers and closed loop circuitry for current control, which are expensive and complicated. The proposed circuit consists of a minimum number of components. It does not require any current transducer or dedicated voltage/current control circuitry. A simple open-loop control system is applicable for the whole charging stage. It is free of stability problem and protects itself from being overloaded by ultracapacitor with zero initial charge. Simulations are done using MATLAB.

Abstract: This converter is a newly designed single input multiple output DC-DC converters with coupled inductor. This converter uses only one power switch .This topology has two boost converters.  One is a high gain converter and other is a normal boost converter. The techniques of voltage  clamping is used to reduce the switching loss and conduction loss. For the high gain converter the energy stored in the leakage inductance of coupled inductor is efficiently recycled to the output. As a result high voltage conversion ratio is obtained. By using this converter, high efficiency power conversion, high step up ratio, and various output voltages with different levels can be obtained. The simulation is carried out in MATLAB/SIMULINK.

Abstract: Renewable Energy plays a pre-eminent role in the development of the country. Renewable energy sources are being used all over the world.  Much of the world’s required energy can be supplied by the use of solar power since it is available in abundant and most importantly cleanest form of energy.  The stand-alone PV systems have been implemented to meet the power requirements at these remote areas which are far away from the generating stations. DC-DC converters are well effectively used in renewable energy because they provide maximum output with high efficiency. This paper proposes about the most efficient topology of two converters SEPIC and Zeta where they have a most prominent advantage that the output voltage of these two converters are not reversed. Corresponding simulation results are implemented and verified using MATLAB and hardware prototype is implemented where maximum efficiency and step-up ratio is obtained.

Abstract: Renewable energy plays a most pre dominant role in the economic growth of the country. The world has moved towards renewable energy since it is eco-friendly. Nowadays, solar technologies and photovoltaics are gaining a maximum share in the market which eventually leads to the development of the country. Substantially DC-DC converters are most prefered in renewable energy as they are capable of obtaining maximum energy hence they are also called as “power optimizers”. The foremost inovation in DC-DC converters is the synchronous rectification process which in due course leads to reduction of switching loses. In this paper multiphase resonant switched capacitor converter (MRSC) is being analized using MATLAB simulation where the high level output voltage and maximum efficiency is obtained and hardware prototype is implemented.

Abstract: The aim of this paper is to analyze a B4 Inverter for induction motor drive. In this approach, instead of conventional 6-switch, 3- phase (SSTP) PWM inverter, a B4 inverter is utilized. This reduces both the cost of the inverter and the computation for real-time implementation. The advantage of this inverter is lesser switching losses, lower electromagnetic interference (EMI), less complexity of control algorithm and reduced interface circuits. A low cost of motor drive is the more advantageous factor that can be achieved using the proposed drive system. A simulation model of the drive system is developed and analyzed in order to verify the effectiveness of the approach. Furthermore in this project Sinusoidal Pulse Width Modulation (SPWM) and Random Pulse Width Modulation techniques are being compared. These techniques are used to generate their respective output PWM signals, which are then compared, based on harmonic content and distortion using the THD measure of various output voltages. In the present work, we propose a study of RPWM technique in a drive system based on a Four Switch Three-Phase inverter, feeding an induction motor. RPWM provide better responses when compared with the conventional PWM Techniques. Random Pulse Width Modulation (RPWM) approach can make the harmonic spectrum of inverter output voltage to be continuously distributed without affecting the fundamental frequency component. The control strategy of the proposed drive system of three phase induction motor is based on Model Predictive Control technique. Simulation results are carried out in Matlab/Simulink to analyze and explore the characteristics of the proposed drive system.