High frequency power conversion architecture for grid interface

With the present ac-voltage distribution system, ac-dc converters are key components for driving many dc voltage applications from the ac grid voltage. There are a lot of electronic devices that natively operate from the dc voltage including light emitting diodes (LEDs), personal and laptop computers, and smart phones; for all of them there is a drive to increase functionality and to reduce the volume at the same time. The desire for further miniaturization is, however, facing a dominant obstacle strained by the performance requirements on power electronic circuits. In this thesis, a design technique for high-performance ac-dc power converters will be presented. A new grid interface ac-dc conversion architecture and associated circuit implementations are proposed along with novel control methods. This approach simultaneously address design challenges associated with high performance (e.g., high efficiency, high power factor, miniaturization, and high reliability/lifetime) of ac-dc power conversion systems. The proposed architecture is suitable for realizing ac-dc converters that switch in the HF range (3-30 MHz) with relatively low-voltage components and with zero-voltage switching (ZVS) conditions, enabling significant converter size reduction while maintaining high efficiency. Moreover, the proposed approach can achieve reasonably high power factor about 0.9, while dynamically buffering twice-line frequency energy using small capacitors operating with large voltage swings over the ac line voltage cycle. The ac-dc converter design shows that excellent combinations of power density, efficiency, and power factor can be realized with this approach.

Department dc:contributor.department

Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science.

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2016

Author dc:creator

• Lim, Seungbum

Advisor dc:contributor.advisor

• David J. Perreault.

• Electrical Engineering and Computer Science.

Statement dc:rights

• M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.

Licence dc:rights.uri

• http://dspace.mit.edu/handle/1721.1/7582

Language dc:language.iso

eng

Handle dc:identifier.uri

http://hdl.handle.net/1721.1/106083

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/106083