Abstract: With the extensive application of power supply, it is more and more important to research the efficientcy and reliability of power supply, as the power supply of O₃ sterilization device, required AC 4000 V voltaged, limited space, high efficiency, good stability. the traditional power convertor with the technology of LLC phase-shifting full-bridge, soft switching and so on can not get the requirements, in ordor to solve these problems, a new-type topology of power supply is proposed, two-stage boost and high frequency power supply. the working principle, parameter design and so on are analyzed detailed and researched importantly, the application of products are described in detail, and get ideal results, it provides a theoretical basis and a power promation model for practical application.

Key words: Self excited half bridge, BOOST, LLC phase-shifted full bridge, Hard switch, Soft switch