sheldon
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Meng,
Don't have an answer just trying to understand what you are looking for. Do you want to keep the same output current? Since the input current is proportional to the output current, unless the efficiency is really bad, is this requirement realistic?
Do you want to reduce the maximum transient value? Do you want to draw a constant current, 2*Iload, from the power supply so the ratio between average and maximum current is smaller?
Do you bypass/filter the voltage doubler? Is the there some reason, for example, needto reduce EMI, that determines this requirement?
Do you want to reduce the transient during one mode, for example, skipping mode?
Best Regards,
Sheldon
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