基于GaN的开关线性复合高速随动脉冲负载直流变换器  

High Speed Switching-Linear Hybrid Followed-Up Pulse Load DC Converter Based on GaN Device

作　　者：樊靖轩 施佳楠 徐子梁 任小永[1] 陈乾宏[1] Fan Jingxuan;Shi Jianan;Xu Ziliang;Ren Xiaoyong;Chen Qianhong(Jiangsu Key Laboratory of New Energy Generation and Power Conversion Nanjing University of Aeronautics and Astronautics,Nanjing 210016 China)

机构地区：[1]南京航空航天大学江苏省新能源发电与电能变换重点实验室,南京210016

出　　处：《电工技术学报》2024年第6期1818-1829,共12页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(52177181)。

摘　　要：有源相控阵雷达发射机收发组件工作在高频脉冲负载模式,这对其供电电源的负载动态性能提出了很高要求。该文针对高速负载切换的二次DC-DC电源,提出开关线性复合并联结构的脉冲负载变换器及其相应的控制策略。基于器件级环路建模的方法有效提升了线性稳压电路的环路带宽,使其进行快速功率跟踪,并设计基于GaN的低阻抗交错并联Buck变换器,使其以较快的速度高效地提供主要脉冲功率。针对重复频率50 kHz、峰值功率120 W的高频模拟雷达脉冲负载,该文搭建脉冲电流上升下降时间50 ns以内的脉冲电源原理样机,输出电压跌落小于5%。实验结果表明所提方法能够有效改善脉冲电源的动态性能。Active phased array radar is a new type of solid-state radar,which has the characteristics of multi-function,multi-target,and high reliability.Each antenna unit is equipped with a transmitting/receiving module(TR module)in active phased array radar.The TR module operates in pulse load mode,requiring a constant voltage and pulse current.The TR module of phased array radar is characterized by a high pulse current slew rate and a high pulse repetition frequency of more than 20 kHz.It needs high requirements on the load dynamic performance of the pulse power supply. In order to meet the increasing pulse repetition frequency and pulse current slew rate of the TR module, this paper proposes a switching-linear hybrid method for the application of high-frequency pulse load. The switching-linear parallel system is built based on theoretical analysis. A 1 MHz interleaving parallel synchronous rectifier Buck converter based on the GaN device, and a bidirectional high-speed linear circuit are used in parallel. The method combines high dynamic response speed of the linear circuit and high conversion efficiency of the switching circuit. The power supply performance of a high di/dt pulse load is effectively improved without sacrificing the system efficiency and power density. The switching-linear hybrid structure and parallel control strategy of pulse power supply are proposed. In order to achieve the high load dynamic response speed, the output impedance characteristics of the linear circuit in each spectrum are explained based on the method of device-level modeling. The operational amplifier compensator of the linear circuit is designed specifically, and the bandwidth is configured at 5 MHz. It effectively improves the loop bandwidth of the linear voltage regulator circuit to perform fast power tracking. With the improvement of dynamic performance, the quality of the pulse waveform is improved by the correction of the upper and lower edges of the pulse current. In order to achieve high system efficiency, a wide band gap devic

关 键 词：脉冲电源 相控阵雷达 氮化镓 动态响应 

分 类 号：TM461[电气工程—电器]