A novel semi-active regenerative snubber

• Main Author: Erlan J. Dzhunusbekov
• Format: Article
• Language: English
• Published: JVE International 2020-08-01
• Series: Journal of Vibroengineering
• Subjects: flyback; transformer leakage energy recovery; regenerative lcd snubber; flying capacitor snubber; pv microinverter
• Online Access: https://www.jvejournals.com/article/21005

A flyback topology has advantages like simplicity, better reliability and low cost, but comes with voltage stresses on semiconductor switches caused by the transformer leakage inductance. An improved regenerative snubber has been proposed to meet ever growing demand for higher efficiency. The proposed snubber topology is a modified LCD flying capacitor snubber and has advantages over conventional prototypes promising high efficiency of leakage energy recovery in high power applications. The beneficial features include: reduced circulating currents in snubber circuits; reduced current RMS on the secondary side; the possibility of recovering part of the leakage energy directly to the secondary output. The operation of the proposed snubber is analyzed to reveal benefits and simulation results are presented to verify performance. The stage by stage analysis with governing formulas has been provided. Design considerations are discussed.