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Abstract
In this paper, a short circuit phenomenon when dc-dc modules with self-driven synchronous rectifier (SR) run in parallel is described. Three existing driving schemes are analyzed and compared. A novel driving scheme for SR maintains the performance of SR as a self-driven scheme, while solving the problem of a short circuit when modules run in parallel. In addition, the amplitude of an SR driving voltage can be adjusted by using the proposed scheme. Therefore, the scheme is more attractive in the applications of comparatively high-voltage output. The principle of operation and the characteristics of the scheme are analyzed and verified on a 36-75V input 1.8-V/60-A output experimental prototype, whose size is 1/4 brick and efficiency is above 90% under rating conditions.
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