Title :
GaN Devices in Resonant LLC Converters: System-level considerations
Author :
Seeman, Michael D.
Abstract :
Resonant or soft-switching converters are common in the high-voltage (400?600 V) space to reduce form factor while maintaining high efficiency. These supplies target topologies such as the LLC, phase-shifted full bridge, and two-switch forward with power levels between 400 W and 5 kW. The LLC converter is a popular topology in this space as it can achieve zero-voltage switching (ZVS) over a wide load range [1]. This article is focused on LLC converters with a 350?400-V input range and an isolated 12 or 48 VDC output. Applications include the second stage of traditional ac/dc supplies for server and telecom markets, electric vehicle (EV) bus converters, and board-mounted supplies for the high-voltage dc distribution trend in rack-mount environments.
Keywords :
AC-DC power convertors; II-VI semiconductors; bridge circuits; resonant power convertors; switching convertors; zero voltage switching; AC-DC supplies; ZVS; board-mounted supplies; electric vehicle bus converters; form factor reduction; gallium nitride devices; high-voltage DC distribution trend; phase-shifted full bridge; power 400 W; power 5 kW; power levels; rack-mount environments; resonant LLC converters; soft-switching converters; system-level considerations; telecom markets; two-switch forward; voltage 350 V to 400 V; voltage 400 V to 600 V; wide load range; zero-voltage switching; Converters; Electric vehicles; Market research; Resonance; Servers; Soft switching; Telecommunication services; Topology; Zero voltage switching;
Journal_Title :
Power Electronics Magazine, IEEE
DOI :
10.1109/MPEL.2014.2381456
