峰值电流模式的蓄电池放电调节器稳定性分析

Stability analysis of battery discharge regulator in peak current mode

通过分析卫星上蓄电池放电调节器工作特点,选用Weinberg变换器作为其主功率级拓扑,给出了Weinberg变换器各工作模态的基本原理,从理论上分析了引入峰值电流控制模式的优点。为了分析蓄电池放电调节器稳定性,采用状态空间平均法建立了基于连续电感电流条件下的峰值电流模式的功率级和控制级的小信号模型,推导出电流内环和电压外环的环路增益,并给出补偿器设计方法。最终以一个600 W的蓄电池放电调节器为例,得到系统补偿前后的稳定性分析结果,通过负载突变实验验证了理论分析的正确性。

By analyzing the working characteristics of the battery discharge regulators on satellites and selecting the Weinberg converter as the topology of the main power stage, the basic principles of each operating mode of the Weinberg converter were given. The advantages of introducing the peak current control mode were analyzed theoretically. In order to analyze the stability of the battery discharge regulator, a small-signal model of the power stage and control stage based on the peak current mode under continuous inductor current conditions was established using the state space averaging method, and the loop gains of the current inner loop and the voltage outer loop were deduced, and the compensator design method was given. Finally, a 600 W battery discharge regulator was taken as an example to obtain the stability analysis results before and after system compensation. The correctness of the theoretical analysis was verified by the load mutation experiment.