A High-Efficiency Asymmetrical Half-Bridge Converter With Integrated Boost Converter in Secondary Rectifier

A conventional asymmetrical half-bridge (AHB) converter is one of the most promising topologies in low-to-medium power applications because of zero-voltage switching of all switches and small number of components. However, when the converter is designed taking a hold-up time into consideration, it h...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2017-11, Vol.32 (11), p.8237-8242
Main Authors: Han, Jung-Kyu, Kim, Jong-Woo, Moon, Gun-Woo
Format: Article
Language:English
Subjects:
Asymmetrical half-bridge (AHB) converter
Capacitors
Circuits
DC/DC converter
Electric bridges
Electric converters
high efficiency
hold-up time
Inductors
Moon
Rectifiers
Stress
Switches
Topology
Transformers
Zero voltage switching
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Summary:A conventional asymmetrical half-bridge (AHB) converter is one of the most promising topologies in low-to-medium power applications because of zero-voltage switching of all switches and small number of components. However, when the converter is designed taking a hold-up time into consideration, it has a large DC offset current in a transformer and a small transformer turns-ratio. To solve these problems, a new AHB converter with an integrated boost converter is proposed in this letter. Because the proposed converter compensates for the hold-up time using the integrated boost converter without additional loss in the nominal state, it can achieve the optimized efficiency regardless of the hold-up time. The effectiveness and feasibility are verified with a 250-400-V input and 45 V/3.3 A output prototype.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2017.2675283