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Question about Boost Converter

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Hi all,

originally i used one switch to make my boost converter ( below pic)


part1.jpg

however the efficiency is too low because of the diode voltage drop, so i used a pmos to replace it

but afterwards the current becomes so low , the current waveform of PMOS switch is attached, the current range is from 500m to -500m

擷取.PNG

i am wondering if this is normal

thanks
 

Why negative current is coming in a switch? Probably you need to provide the new diagram, along with the driving circuit.
 

Why negative current is coming in a switch? Probably you need to provide the new diagram, along with the driving circuit.

i only test the converter with an open loop, just give voltage pulse directly to the nmos and pmos switch.

part1.jpg
 

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