Abstract
In order to enhance the efficiency of LLC resonant converters, a new synchronous rectification modulation technique, called homopolarity cycle modulation, is proposed. The proposed modulation technique answers the main challenge in synchronizing the LLC converter's rectifier, which is detecting the conduction angle. By observing the polarities of the inverter voltage and secondary voltage of the transformer and mapping them in the homopolarity plane, the conduction angle of the synchronous rectifiers (SRs) is obtained. The homopolarity cycle is defined and used in the LLC converter's time domain equations to mathematically calculate the gain and the SRs' conduction angle. The theoretical analyses have resulted in a very simple control law with low-cost implementation requirements. Since the amplitudes of the signals used in the proposed control law are not important, the modulation technique's noise immunity is considerable. The maximum efficiency of the LLC converter using the proposed homopolarity cycle modulation technique is measured as 97.9%, which is 4% higher than the efficiency rate of a conventional LLC converter.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
