Irfz44 MOSFET Gate Voltage Spikes Above 10kHz in 3-Phase H-Bridge Bootstrap Circuit

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#1 21685565 30 Sep 2021 08:30

modsuper modsuper

Anonymous

Post #1
21685565 30 Sep 2021 08:30

Hi guys,
I try to design a boostrap circuit for inverter driver or 3 phase h bridge.
Anyway, I have a problem that Irfz44 mosfet is above 10khz.
while gate capacitans flowA ground, Voltage momentary increases from 5v to 50v
İf you have a solution on this topic, can you give a n information?

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#2 21685566 02 Jan 2024 09:30

Fans-Crm Fans-Crm

Anonymous

Post #2
21685566 02 Jan 2024 09:30

Me and my friend from the university working on ADC SAR
for the beginning we started to work on Sample and Hold circuit and we choose to use the Bootstrap Sample and Hold circuit
We learn about the circuit and one of the transistors (M10) in our schematic look like useless and if we do the simulation without this transistors the circuit is working better.
We attached the schematic and want to ask what is the purpose of M10

thank you all
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