针对星载合成孔径雷达电源高效率抗辐射的需求,对适用于星载领域的各种电源拓朴结构进行了对比分析,提出一种同步整流正激变换器拓扑方案。该方案采用单管栅极电荷保持驱动拓扑,解决了变压器死区时间续流管驱动问题,并对电路原理以及抗辐射加固方法进行详细说明,给出电路组成、关键器件和参数计算方法。根据所提方案制作了一台输入50 V~70 V、输出5 V/6 A 的样机。实验结果表明:该电源具有高效率和抗辐射的特点,验证了技术方案的准确性,可以满足星载电源的需求。

In response to the demands for high efficiency of spaceborne synthetic aperture radar power converter, after comparing the topologies of various power supplies suitable for the spaceborne, a topology scheme of synchronous rectifier forward converter is proposed in this paper, which adopts a novel gate charge retention voltage-driven synchronous rectifier topology to solve the freewheeling driving problem in transformer dead time. Circuit principle, radiation-hardened method, main components, parameter calculation methods are described in detail. A prototype with 50 V~70 V input and 5 V/6 A output is manufactured according to the proposed scheme. The characteristics of high efficiency, radiation-hardened and the accuracy of solution have been proven by experimental results. New forward converter can meet the requirements of the spaceborne power supply.

TN86