Title :
An improved wide input voltage buck-boost + LLC cascaded converter
Author :
Xiaofeng Sun;Jiangfeng Qiu;Xiaohua Li;Baocheng Wang;Lu Wang;Xin Li
Author_Institution :
Key Lab of Power Electronics for Energy Conservation and Motor Drive of Hebei Province, Yanshan University Qinhuangdao 066004, China
Abstract :
An improved buck-boost + LLC (IBB LLC) cascaded converter appropriate for wide input voltage situation is presented in this paper, which can be used as a constant voltage source or a constant current source charger for battery. The control strategy of dual frequency PWM (DFPWM) is introduced. For the LLC converter, ZVS for MOSFETs and ZCS for diode are achieved. As a result, the switching loss is reduced and the converter can operate at higher switching frequency with high efficiency. The operation principle and characteristics of the presented converter are verified on a 200V-450V input 14V/80A output experimental prototype.
Keywords :
"Zero voltage switching","Inductors","Resonant frequency","Switching frequency","Switches","Frequency control","Hybrid electric vehicles"
Conference_Titel :
Energy Conversion Congress and Exposition (ECCE), 2015 IEEE
Electronic_ISBN :
2329-3748
DOI :
10.1109/ECCE.2015.7309867
