磁放大器后级调整同步整流技术研究

在双管正激拓扑中,传统的自驱动同步整流技术在主变压器磁复位完成后存在一段死区时间,无法再维持同步续流管导通。在死区时间内,输出滤波电感的电流将从同步续流管的体二极管流通,使得同步整流的性能受到一定限制。然而,对于带磁放大器后级调整器的同步整流场合,死区问题更加严重。现针对双管正激磁放大器后级调整同步整流技术,提出一种新的栅极电荷维持驱动方案。它解决了死区问题,并提高了同步整流性能。研制了一台工作频率为150kHz,输入385V,输出5V/30A和3.3V/30A,采用栅极电荷维持磁放大器后级调整同步整流技术的原理样机。实验结果表明,满载时的整机效率不低于88%。

Study on Synchronous Rectification for Magamp Post Regulation Application

A new gate charge retention voltage driven synchronous rectification scheme is proposed in this paper,with the purpose to improve the rectifier efficiency for Magnetic amplifier(Magamp) post regulation application.The proposed method solves the body diode conduction of freewheeling synchronous rectifier in dead time.A 150 kHz,385 V input 5 V/30 A,3.3 V/30 A multiple outputs DC-DC module is designed in laboratory,over 88% efficiency is achieved at full load.