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关于学生直流电源输出纹波的问题

我在做一个双向DC-DC变化的题目,输出老是有600mV-1.2V的波动,后来测得直流电源电压出来就有600-800mV的波动,具体情况如下图,我该怎样把输入电压的纹波减小啊,望各位大神和工程师们指点