Non-Isolated DC–DC Power Converter With High Gain and Inverting Capability

Mohammad Meraj,B Prathap Reddy,Atif Iqbal,Mahajan Sagar Bhaskar

doi:10.1109/access.2021.3074459

Mohammad Meraj, B Prathap Reddy + Show 2 more

Open Access

https://doi.org/10.1109/access.2021.3074459

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Abstract

As the voltage gain of converter increases with the same ratio, the current gain also increases, this increase in current gains will affect the size of the input and the output capacitor. To reduce the ripple in the input current with simultaneous decreasing the input current ripple, a novel current fed interleaved high gain converter is proposed by utilizing the interleaved front-end structure and Cockcroft Walton (CW)-Voltage Multiplier (VM). The “current fed” term is used because, in proposed circuitry, all the capacitors of CW-VM are energized by a current path via inductors of the interleaved structure. The proposed converter can be applied as an input boost up the stage for low voltage battery energy storage systems, photovoltaic (PV) and fuel cell (FC) based DC-AC applications. The anticipated topology consists of the two low voltage rating switches. The main benefits of the anticipated converter configuration are the continuous (ripple free) input current, high voltage gain, reduced switch rating, high reliability, easy control structure and a high percentage of efficiency. The proposed converter’s working principle, mathematical based steady-state analysis, and detailed component design are discussed. The parasitic of the components has been considered in the analysis to show the deviation from the ideal cases. A detailed comparison with the other available converters is presented. The experimental results of the 300W prototype are developed to confirm the performance and functionality of the anticipated DC-DC converter.

Highlights

Nowadays, switching power converters gaining popularity with the development of high-frequency components
Both the switches are operated at the equal duty cycle and operated between 50% to 80% duty cycles
A novel non-isolated current fed interleaved inverting high gain DC-DC power converter is reported for the renewable applications

Summary

INTRODUCTION

Nowadays, switching power converters gaining popularity with the development of high-frequency components. To achieve the required high gain, conventional negative output converters are not suitable because they have to operate at higher duty ratios, which increases the high losses in the semiconductors To address this several high step-up converters such as Z or qZ source converters, inductor coupled, and transformer isolated converters, switch inductor, cascaded and quadratic, and switched capacitor converters are proposed. Capacitor Diode-Voltage Multipliers (CD-VM) [17]–[19] based configuration are recently proposed to achieve a higher output voltage These topologies can be a good solution for high voltage conversion due to uniform voltage stress across all the semiconductors devices and capacitors, multiple capacitor stages at the output, simple structure, higher voltage gain devoid of extreme duty cycle, suitable to feed multilevel inverters, and easy to add or remove the number of stages without disturbing the main boosting circuitry. All the operating stages and the voltage gains are derived in the coming sections

OPERATING MODES

STEADY-STATE DCM ANALYSIS

PROPOSED CONVERTER CONTROL STATES

HARDWARE RESULTS AND DISCUSSION

CONCLUSION