摘要
针对基于交错并联耦合式滤波电感的电池包测试直流电源的轻载振荡问题进行研究。首先针对两模块交错并联下的输出侧进行电路模态分析,得到磁耦合滤波结构的等效滤波参数。之后基于小信号建模方法建立单路测试通道移相全桥(PSFB)拓扑的传递函数模型,从而分析了在不同电池包测试功率等级下的系统传递函数特性。利用奈奎斯特判据对轻载下PSFB传递函数的幅频、相频特性进行研究,揭示了轻载下充电电流低频振荡现象的成因以及规律,提出了相应的解决方案,并通过Saber仿真验证了分析的正确性。最后在实验室搭建的电池包测试平台进行了实验验证,给出了相应的实验波形,证明了所提出方案对抑制低频振荡的有效性。
The light-load oscillation of DC power supply for battery packs test based on interleaving parallel technology and filter inductor coupled structure is studied in this paper.the circuit modal analysis is performed on the output side of the two paralleled modules,and the equivalent filter inductor parameters of the magnetic coupling filter structure are obtained.Then,based on the small-signal modeling method,the transfer function model of the single test channel which is based on the phase-shifted full-bridge(PSFB)topology is established,and the system transfer function characteristics under different battery pack test power levels are analyzed.The Nyquist criterion is used to study the amplitude-frequency and phase-frequency characteristics of the PSFB transfer function under light load.The causes and laws of the low-frequency oscillation of the charging current under light load are revealed.The corresponding solution is proposed and the correctness of the analysis was verified by Saber simulation.Finally,the experimental test of the battery pack test platform built in the laboratory was carried out,and the corresponding experimental waveforms were given to prove effectiveness of the proposed scheme for suppressing low-frequency oscillation.
出处
《计量与测试技术》
2020年第3期22-29,35,共9页
Metrology & Measurement Technique
关键词
磁耦合
移相全桥
小信号建模
低频振荡
magnetic coupling
PSFB
small-signal modeling
low-frequency oscillation
