Title :
MHz GaN-based interleaved CRM bi-directional buck/boost converter with coupled inductor
Author :
Xiucheng Huang ; Lee, Fred C. ; Qiang Li ; Weijing Du
Author_Institution :
Bradley Dept. of Electr. & Comput. Eng., Virginia Polytech. Inst. & State Univ., Blacksburg, VA, USA
Abstract :
This paper presents a high frequency high efficiency GaN device based interleaved critical current mode (CRM) bi-directional buck/boost converter with a coupled inductor. The switching frequency is continually driven to MHz range with GaN devices due to their small switching loss and driving loss, which greatly reduce the size of the passive components. The coupled inductor further reduces the core volume due to certain DC flux reductions. The equivalent inductance and the impact of the coupled inductor on the CRM buck-boost converter are analyzed in detail. The resonant period at CRM is less with a coupled inductor than with a non-coupled inductor, which is beneficial for high frequency operation. The soft-switching range and the circulating energy are both improved using a coupled inductor at CRM. Experimental results validate the theoretical analysis, and the coupled inductor prototype efficiency is 98.5% at 1MHz, which is 0.3% higher than a prototype with a non-coupled inductor.
Keywords :
III-V semiconductors; gallium compounds; inductors; power convertors; wide band gap semiconductors; DC flux reductions; GaN; coupled inductor; critical current mode converter; driving loss; efficiency 98.5 percent; equivalent inductance; frequency 1 MHz; high frequency operation; interleaved CRM bidirectional buck-boost converter; noncoupled inductor; passive components; resonant period; switching frequency; switching loss; Customer relationship management; Gallium nitride; Inductance; Inductors; Resonant frequency; Switches; Switching frequency; Coupled inductor; Critical mode (CRM); Gallium Nitride (GaN); Zero-voltage-switching (ZVS);
Conference_Titel :
Applied Power Electronics Conference and Exposition (APEC), 2015 IEEE
Conference_Location :
Charlotte, NC
DOI :
10.1109/APEC.2015.7104635