Title :
Seamless operation of bi-directional LLC resonant converter for PV system
Author :
Abe, Shigeto ; Ninomiya, Tamotsu ; Zaitsu, T. ; Yamamoto, Jun ; Ueda, Shuichi
Author_Institution :
Int. Center for the Study of East Asian Dev., Kitakyushu, Japan
Abstract :
This paper proposes the simple and seamless operation technique for bi-directional LLC converter. Generally, bi-directional operation of LLC converter is complicated and difficult to control. Because, the switching frequency has to be changed across fsr (series resonant frequency) and the switching sequences has to be also changed due to resonant characteristics. In order to simplify the switching scheme, the switching frequency is moved to higher frequency than fsr where ZVS condition is maintained and simple switching sequence is achieved for both direction. The experimental results for 400Vin, 48Vo, 300W board achieves 93% efficiency and validated this method is useful practically.
Keywords :
DC-DC power convertors; photovoltaic power systems; resonant power convertors; switching convertors; zero voltage switching; FSR; PV system; ZVS condition; bi-directional DC-DC converter; bi-directional LLC resonant converter; efficiency 93 percent; power 300 W; resonant characteristics; seamless operation technique; series resonant frequency; switching frequency; switching sequences; voltage 400 V; voltage 48 V; Batteries; Frequency conversion; Impedance; Resonant frequency; Switches; Switching frequency; Zero voltage switching;
Conference_Titel :
Applied Power Electronics Conference and Exposition (APEC), 2014 Twenty-Ninth Annual IEEE
Conference_Location :
Fort Worth, TX
DOI :
10.1109/APEC.2014.6803582
