Novel Design of LLC Resonant Converter with Peak Gain Adjustment
Abstract: The main benefits of
a half-bridge LLC resonant DC/DC converter that uses two inductors (LL) and a
capacitor (C) over the other load resonant converters are its less circulating
currents, largerbandwidth for Zero Voltage Switching (ZVS) and limited tuning
of operating frequency for controlled output. LLC resonant DC/DC converter is
identified as a widely adopted topology in server and telecom power system
applications because of its higher efficiency, flexibility and reliability.
This paper proposes a novel design procedure using peak gain adjustment for a
design example of 400V/12V-5A LLC resonant DC/DC converter used in server based
applications. An experimental set up of the converter for the specifications mentioned
is built and evaluated with the power switch traded as FSFR 2100 IC of Texas
Instruments in closed loop configuration. The experimental results have
exhibited an improved efficiency of 94% with the novel design proposed for the
converter.
Keywords: LLC resonant DC/DC
converter, Fundamental Harmonic Approximation, zero-voltage switching, MOSFETS
Author: P. Kowstubha
Journal Code: jptkomputergg160269
