Research on Topology and Control Strategy for Pulsed Load Two-Stage DC-DC Power Supply

doi:10.16628/j.cnki.2095-8188.2024.05.003

Abstract

Abstract:

In order to meet the requirements of high power density and high dynamic response performance of pulse-load DC converter,a two-stage DC converter applied to pulsed load is studied.Among them,the three-level synchronous rectifier buck converter with smaller filter inductance and higher system loop bandwidth is selected as the pre-stage converter,and the DCX (DC Transformer)-LLC resonant converter is selected as the post-stage converter,which has more advantages in dynamic response and efficiency than the closed-loop control LLC.Then,a soft-start strategy to optimize the voltage stress problem of TL(Three Level)-Buck switch is proposed,which solves the problem that the flying capacitor voltage drops to a very low level after charging in the soft-start stage.Finally,the proposed closed-loop and soft-start control strategies of two-stage DC converters are verified by simulation and experiments,and it is determined that the soft-start strategy can optimize the voltage stress of the switch during the start-up of the pre-stage TL-Buck.

Key words: pulsed load DC converter, pulsed power balance, two-stage architecture, fast dynamic response

CLC Number:

TM46

ZHANG Seng, CAO Xuan, TAN Yunfei, ZHAO Zhihong. Research on Topology and Control Strategy for Pulsed Load Two-Stage DC-DC Power Supply[J]. LOW VOLTAGE APPARATUS, 2024, 0(5): 20-29.

Figures/Tables 23

占空比及控制模式	电感电流上升斜率
稳态控制D<0.5	$0.5 U i n - U o L 1$
稳态控制D>0.5	$U i n - U o L 1$
暂态控制	$U i n - U o L 1$

占空比及控制模式	电感电流上升斜率
稳态控制D<0.5	$- U o L 1$
稳态控制D>0.5	$0.5 U i n - U o L 1$
暂态控制	$- U o L 1$

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参数类别	参数指标
前级输入电压/V	300
中间母线额定电压/V	120
前级开关频率/kHz	50
滤波电感最大电流纹波率/%	20
后级输出电压/V	48
后级稳态输出电流/A	12.5
后级暂态峰值输出电流/A	25
后级开关频率/kHz	100
后级稳态输出功率/W	600
后级暂态峰值输出功率/kW	1.2