Abstract
A new continuous conduction mode (CCM)/discontinuous conduction mode (DCM) hybrid-mode synchronous rectification (SR) flyback converter is proposed in this paper. This converter is realized by adding a combined switch in parallel with the auxiliary winding of the flyback transformer. The added switch is controlled to conduct a short period before the primary switch turns on, which shorts the windings of the transformer. The drain-source voltage of SR arises rapidly to reach the turn-off threshold voltage inside SR controller and the SR is turned off before the primary switch conducts. In this way, the overlapped period existed in a conventional CCM SR flyback converter is eliminated. Meanwhile, the normal operation of SR flyback in DCM is not affected. Detailed theoretical analysis has been presented and verified by a 12 V/2.5 A CCM/DCM hybrid-mode flyback experimental prototype. The results prove that the efficiency of the proposed SR method in CCM can be improved compared with the conventional one.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: 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.