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High Efficiency High-Step-up Single-ended DC-DC Converter with Small Output Voltage Ripple

Authors
Kim, Do-HyunKim, Hyun-WooPark, Joung-HuJeon, Hee-Jong
Issue Date
Nov-2015
Publisher
KOREAN INST POWER ELECTRONICS
Keywords
High step-up; Isolated switched-capacitor cell; Output ripple; Single ended; Tapped inductor
Citation
JOURNAL OF POWER ELECTRONICS, v.15, no.6, pp.1468 - 1479
Journal Title
JOURNAL OF POWER ELECTRONICS
Volume
15
Number
6
Start Page
1468
End Page
1479
URI
http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/8595
DOI
10.6113/JPE.2015.15.6.1468
ISSN
1598-2092
Abstract
Renewable energy resources such as wind and photovoltaic power generation systems demand a high step-up DC-DC converters to convert the low voltage to commercial grid voltage. However, the high step-up converter using a transformer has limitations of high voltage stresses of switches and diodes when the transformer winding ratio increases. Accordingly, conventional studies have been applied to series-connect multioutput converters such as forward flyback and switched-capacitor flyback to reduce the transformer winding ratio. This paper proposes new single-ended converter topologies of an isolation type and a non-isolation type to improve power efficiency, cost-effectiveness, and output ripple. The first proposal is an isolation-type charge-pump switched-capacitor flyback converter that includes an extreme-ratio isolation switched-capacitor cell with a charge-pump circuit. It reduces the transformer winding number and the output ripple, and further improves power efficiency without any cost increase. The next proposal is a non-isolation charge-pump switched-capacitor-flyback tapped-inductor boost converter, which adds a charge-pump-connected flyback circuit to the conventional switched-capacitor boost converter to improve the power efficiency and to reduce the efficiency degradation from the input variation. In this paper, the operation principle of the proposed scheme is presented with the experimental results of the 100 W DC-DC converter for verification.
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공과대학 (전기공학부)
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