DocumentCode :
3566239
Title :
Optimal design methodology of bidirectional LLC resonant DC/DC converter for solid state transformer application
Author :
Kai Tan ; Ruiyang Yu ; Suxuan Guo ; Huang, Alex Q.
Author_Institution :
Dept. of Electr. & Comput. Eng., North Carolina State Univ., Raleigh, NC, USA
fYear :
2014
Firstpage :
1657
Lastpage :
1664
Abstract :
The isolated DC/DC stage in solid state transformer (SST) is a very critical stage in the whole system. It converts the high DC voltage to low DC voltage with the galvanic isolation after the high voltage AC/DC rectifier and before the low voltage DC/AC inverter. In previously developed solid state transformers, dual active bridge (DAB) and dual half bridge (DHB) are the most common topology for this part. In this paper, a bidirectional LLC resonant converter is presented to replace the traditional DAB or DHB in SST application. Compared with DAB, the bidirectional LLC converter can achieve higher efficiency with wider range of zero voltage switching (ZVS), zero current switching (ZCS) and simpler control strategy, which makes it highly attractive for solid state transformer applications. The converter operation modes are presented and analyzed in this paper. For achieving higher efficiency, a methodology of hardware design optimization is introduced to minimize the power losses. Analysis, simulation and experimental results based on a scaled down prototype are shown and discussed.
Keywords :
DC-DC power convertors; optimisation; power transformers; resonant power convertors; zero current switching; zero voltage switching; DAB; DHB; SST; ZCS; ZVS; bidirectional LLC resonant DC-DC converter; converter operation modes; dual active bridge; dual half bridge; galvanic isolation; hardware design optimization; high DC voltage; high voltage AC-DC rectifier; isolated DC-DC stage; low DC voltage; low voltage DC-AC inverter; power losses; solid state transformer; zero current switching; zero voltage switching; Bridge circuits; Capacitors; Low voltage; MOSFET; Solids; Switches; Topology; LLC resonant converter; bidirectional; design methodology; efficiency optimization; solid state tranformer;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Industrial Electronics Society, IECON 2014 - 40th Annual Conference of the IEEE
Type :
conf
DOI :
10.1109/IECON.2014.7048725
Filename :
7048725
Link To Document :
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