Si and GaN-based synchronous rectification of LLC resonant converters using homopolarity cycle modulation
May 27, 2018
In order to further reduce losses in LLC resonant converters, the use of synchronous rectifiers (SRs) in the output rectifier is desirable. Analysis and detection of the conduction angles of the SRs used in an LLC converter are the main challenges in synchronous rectification. This project develops a new time domain theoretical analysis, called homopolarity cycle, enabling synchronous rectification in LLC resonant converters with the use of a low-cost-polarity-based sensing technique.
• Designed, developed and implemented a synchronous rectifier control board for a 1.2kW LLC resonant converter, increased the SR operating range from 40% to 90%, and improved the efficiency by 5%
• Conducted reliability and robustness tests, redesigned the system, resulted in a more reliable system