High Step-Up Resonant DC-DC Converter With Ripple-Free Input Current for Renewable Energy Systems

In this paper, we propose a high step-up resonant dc-dc converter with ripple-free input current for renewable energy systems. We use an input-current doubler and a switching mechanism employed at an output-voltage doubler to achieve high step-up voltage gain without having to use a transformer with...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2018-11, Vol.65 (11), p.8543-8552
Main Authors: Seok, Hwasoo, Han, Byeongcheol, Kwon, Bong-Hwan, Kim, Minsung
Format: Article
Language:English
Subjects:
Active-clamp circuit
Capacitors
Circuit design
Converters
DC-DC power converters
Design for recycling
Direct current
Electric potential
Energy conversion efficiency
Fossil fuels
Inductance
Inductors
input-current doubler
input-current ripple
minimum number of devices
output-voltage doubler
Renewable energy
Renewable energy sources
Renewable resources
secondary-side switching
Switches
Switching
Switching circuits
transformer turns ratio
Voltage gain
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Summary:In this paper, we propose a high step-up resonant dc-dc converter with ripple-free input current for renewable energy systems. We use an input-current doubler and a switching mechanism employed at an output-voltage doubler to achieve high step-up voltage gain without having to use a transformer with high turns ratio. An active-clamp circuit installed on the primary side suppresses the surge voltage at the switch components and recycles the energy stored in the leakage inductance. A resonance that occurs at the secondary side of the converter is used to reduce the turn-off current and switching loss significantly, and to achieve high power conversion efficiency. The input-current ripple declines to zero theoretically because the duty cycle of the primary-side switches is always set to 0.5 regardless of the input voltages and load variations. The circuit operations, steady-state analysis, and design guideline of the proposed converter are also presented. A 600-W prototype converter has been fabricated to demonstrate the performance of the proposed converter.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2018.2818653