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first,thank you for your replay.yes,the duration time of this spike is very short,but it have a significant impact on the dissipation power,to prove this you can see page811 of: fundmental of power electronics(second edition),i think it can increase the power dissipation many time.
When i was simulating the boost converter,i found the power dissipation on the switch mosfet sometimes was bigger than the power source,and sometimes approximated to the power of power source,then the total power dissipation in the converter components was bigger than the power supply ,so where...
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