Title :
High-frequency flyback-type soft-switching PWM DC-DC power converter with energy recovery transformer and auxiliary passive lossless snubbers
Author :
Inaba, C.Y. ; Konishi, Y. ; Nakaoka, M.
Author_Institution :
Graduate Sch. of Sci. & Eng., Yamaguchi Univ., Japan
Abstract :
A two-switch high-frequency flyback-type zero voltage soft-switching PWM DC-DC power converter for use in auxilary power supplies is proposed. Its basic building block is composed of two active power switches and a flyback high frequency transformer. In addition, two passive lossless snubbers with power regeneration loops for energy recovery that consist of a three-turn auxiliary high frequency transformer, auxiliary capacitors and diodes, are introduced to achieve zero voltage soft switching in the full range of light to full load conditions. The power converter has the advantages of a low cost circuit configuration, a simple control scheme and a high efficiency. The converter´s operating principle is described and to in order determine circuit parameters, some practical design considerations are discussed. The effectiveness of the proposed power converter is evaluated and is compared to a hard-switching PWM DC-DC converter. The comparative electromagnetic conductive noise characteristics of both DC-DC power converter circuits are also investigated.
Keywords :
DC-DC power convertors; PWM power convertors; electromagnetic interference; high-frequency transformers; power supplies to apparatus; snubbers; switching convertors; 1 kW; active power switches; auxilary power supplies; auxiliary capacitors; diodes; electromagnetic conductive noise characteristics; energy recovery; flyback high frequency transformer; flyback-type soft-switching PWM DC-DC power converter; high-frequency power converter; light to full load conditions; low cost circuit configuration; operating principle; passive lossless snubbers; power regeneration loops; three-turn auxiliary high frequency transformer; two-switch power converter; zero voltage soft switching;
Journal_Title :
Electric Power Applications, IEE Proceedings -
DOI :
10.1049/ip-epa:20031060