A high Step-up DC-DC Converter employs Cascading Cockcroft-Walton Voltage Multiplier by omitting Step-up Transformer

: In my paper possess a high voltage gain and devoid of using Step up transformer through a high step-up DC-DC converter based on Cockcroft-Walton (CW) voltage multiplier. Here the input was in low to DC voltage is boost up with the help of  boost inductor in DC-DC converter. The n-number of stages CW-voltage multiplier is applying input as low to  AC voltage to high output DC voltage. This afford gets a continuous input current with low ripple, high voltage gain, reduced switching losses, low voltage stress on the switches, diodes & capacitors and also improving efficiency of the converter. In my paper, strategic controlled steps retain two independent frequencies, one of which operates at high frequency to optimized size of the inductor while the other one operates at comparatively low in frequency according to the desired output voltage ripple. Finally this converter is authorized by simulation and experimental result is designed

Boost Interleaved Converter Integrated Voltage Multiplier Module for Renewable Energy System

This document presents a high step-up converter, which is apt for renewable energy system. Through a voltage multiplier unit composed of switched capacitors and coupled inductors, a conventional interleaved boost converter obtains high step-up gain without operating at extreme duty ratio. The design of the proposed converter not only reduces the current stress but also constrains the input current ripple, which decreases the conduction losses and lengthens the lifetime of the input source. In addition, due to the lossless passive clamp performance, leakage energy is recycled to the output terminal. Hence, large voltage spikes across the main switches are alleviated, and the efficiency is improved. Even the low voltage stress makes the low-voltage-rated MOSFETs be adopted for reductions of conduction losses and cost. Finally, the prototype circuit with 40-V input voltage, 380-V output, and 1000-W output power is operated to verify its performance. The highest efficiency is 97.1%. Index Terms - Voltage multiplier module. Boost–flyback converter, high step-up, photovoltaic (PV) system

High-Conversion-Ratio Bidirectional DC–DC Converter With Dual Coupled Inductors

In this paper, a high-conversion-ratio bidirectional DC–DC converter with dual coupled inductors is proposed. In the boost mode, two capacitors are parallel charged and series discharged by the dual coupled inductors. Thus, high step-up voltage gain can be achieved with an appropriate duty ratio. In the buck mode, two capacitors are series charged and parallel discharged by the dual coupled inductors. The bidirectional converter can have high step-down voltage gain. The stress voltage of all switches can be reduced, and the switching loss and efficiency can be improved. The operating principle and the steady-state analyses of the voltage gain are discussed. Finally, in 24V for low voltage, and 400V for high voltage, and 200W for output power, this converter simulated in MATLAB

A floating-output interleaved boost DC–DC converter with high step-up gain

A new interleaved boost converter with high step-up gain is presented in this paper. The proposed topology integrates coupled inductors and floating-output capacitors technique into interleaved boost converter to provide high step-up voltage gain without extreme duty cycle. The voltage stress on the power switches and diodes is very low, so low-cost and highperformance semiconductor devices can be employed. Also, the reverse recovery problem of all diodes is mitigated and zero-current-switching (ZCS) turn-on operation of the main switches is established as well. In addition, the passive clamp circuits are employed to suppress the voltage spikes across the main switches during turn-off instants. The operating principles and steady-state analysis of the proposed converter in continuous condition mode are explained. Finally, the simulation and experimental results of prototype 25–400 V circuit with 200 W output power are provided to verify the performance of presented topology

Analysis of a Bidirectional DC-DC Converter with High Voltage Gain

A novel bidirectional DC-DC converter with high conversion ratio is proposed in this paper. The proposed converter uses the three windings coupled-inductor to achieved high voltage conversion ratio. The primary side consist of a winding and secondary side consist of two windings, which these two windings are series to achieved high voltage gain.In the boost mode, a capacitor is parallel charged and series discharged by the coupled inductor. Thus, high step-up voltage gain can be achieved with an appropriate duty ratio. In the buck mode, a capacitor is series charged and parallel discharged by the coupled inductor. The bidirectional converter can have high step-down voltage gain.The stress voltage of main switches can be reduced, and efficiency can be improved. The operating principle and the steady-state analyses of the voltage gain are discussed. Finally, in 24V for low voltage, and 400V for high voltage, and 200W for output power, this converter is simulated in MATLAB

Analysis of a Bidirectional DC-DC Converter with High Voltage Gain

A novel bidirectional DC-DC converter with high conversion ratio is proposed in this paper. The proposed converter uses the three windings coupled-inductor to achieved high voltage conversion ratio. The primary side consist of a winding and secondary side consist of two windings, which these two windings are series to achieved high voltage gain.In the boost mode, a capacitor is parallel charged and series discharged by the coupled inductor. Thus, high step-up voltage gain can be achieved with an appropriate duty ratio. In the buck mode, a capacitor is series charged and parallel discharged by the coupled inductor. The bidirectional converter can have high step-down voltage gain.The stress voltage of main switches can be reduced, and efficiency can be improved. The operating principle and the steady-state analyses of the voltage gain are discussed. Finally, in 24V for low voltage, and 400V for high voltage, and 200W for output power, this converter is simulated in MATLAB

A High Efficiency DC/DC Converter for High Voltage Gain High Current Applications

A new class of high-voltage-gain dc-dc converters for high-efficiency and transformer-less dc-dc applications, where large voltage step-up ratios are required, is presented in this paper. The converter is derived from the hybrid integration of a switched-capacitor converter and a boost converter. It features high step-up voltage conversion ratio with a moderate duty cycle, nonpulsating input current, low-voltage stress on all of the switches, easy implementation of control and driving circuits, scalability for high-current high-power applications, and low cost due to reduced components via combination of a two-stage converter into a single-stage converter. Full soft-charging operation and minimal device voltage stresses are achieved under all operating conditions. Steady-state operations of the converter are comprehensively analyzed. A 300-W prototype of a 19-time converter achieving the peak efficiency of 96.1% is built. Both simulation and experimental results validating the theoretical analysis and operation of the converter are provided.</p

An Interleaved Configuration of Modified KY Converter with High Conversion Ratio for Renewable Energy Applications; Design, Analysis and Implementation

In this paper, a new high efficiency, high step-up, non-isolated, interleaved DC-DC converter for renewable energy applications is presented. In the suggested topology, two modified step-up KY converters are interleaved to obtain a high conversion ratio without the use of coupled inductors. In comparison with the conventional interleaved DC-DC converters such as boost, buck-boost, SEPIC, ZETA and CUK, the presented converter has higher voltage gain that is obtained with a suitable duty cycle. Despite the high voltage gain of the proposed converter, the voltage stress of the power switches and diodes is low. Therefore, switches with low conduction losses can be applied to improve the converter efficiency. Moreover, due to utilization of interleaving techniques, the input current ripple is low which makes the suggested converter a good candidate for renewable energy applications such as PV power system. Operation principle and steady-state analysis of the proposed converter in continuous conduction mode (CCM) and discontinuous conduction mode (DCM) are discussed in detail. Also, theoretical efficiency of the proposed converter is calculated. Finally, in order to evaluate the proposed converter operation by a renewable energy source such as a PV, the simulation results are presented. Moreover, a 220W prototype of the presented DC-DC converter is designed and implemented in the laboratory to verify its performance

Photovoltaic System with Step Up Converter

A novel  step up converter which is proposed for a front end photovoltaic power system. Through a voltage multiplier module in which an asymmetrical interleaved step up converter usually high step up gain without which act as a function at an extreme duty ratio. The voltage multiplier module which is create of a conventional boost converter and coupled inductors. An extra conventional boost converter is combine into the first phase to achieve a considerably higher voltage conversion ratio. The two phase configuration not only decreases the current stress through each power switch but also force to do some thing the input current ripple, in which decreases the conduction losses of MOSFETs. The proposed step up converter functions as an active clamp circuit which moderate large voltage spikes across the power switches. So, the low-voltage rated MOSFETs which can be adopted for reduces of conduction losses and also cost. Efficiency improves because the energy which is stored in leakage inductances is energized to the output terminal. Finally, the prototype circuit which with a 40V input voltage, 380V output is operated to verify its performance. The highest efficiency of the step up converter is 96.8%

A High Step Up Converter With A Voltage Multiplier Module For A Pv System

A novel high step-up high-efficiency interleaved converter with voltage multiplier module for renewable energy system, is proposed in this paper. A new voltage multiplier module composed which is having switched capacitors and coupled inductors, with its combination a conventional interleaved boost converter obtains high step-up gain without operating at extreme duty ratio is designed. This proposed converter reduces the current stress and also reduces constrains the input current ripple, which decreases the conduction losses and lengthens the lifetime of the input source. Hence, large voltage spikes across the main switches are reduced, and hence the efficiency will be improved. Even the low voltage stress makes the low-voltage-rated MOSFETs be adopted for reductions of conduction losses and cost. The proposed circuit designed with 40-V input voltage, 380-V output, and 1000-W output power in the MATLAB/SIMULINK software, and is operated to verify its performance. The highest efficiency is 97.1%