I need to use gate signals of 24v bldc driver board to drive external high voltage mosfet of 400v, the aim is that I have bldc solar water pump whose drive is dead so I want to use a ready made 24v bldc driver board as oscillator for my Mosfet power board. Is it going to succeed? What should I consider when making it?
Brushless motors require an "H" bridge drive. 6 mosfets in kind of a H+ drive. One half bridge for each motor winding.
Reading your post I'm not sure exactly your goal but it sounds like you have a 400V bldc motor. With which you want to drive some 400v capable mosfets using your current 24v bldc driver.
I will assume your 400V motor has no encoder so the driver has to watch the voltage on the unconnected to know when to switch drive phases. If this is so then you won't be able to "watch" the open leg with your 24V bldc controller.
It would help if you could give us more detail on the parts.
John
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I think that if you mounted this smaller 24V motor on the axis of the 400V motor and connected a 24V BLDC regulator to it, then you could take a signal from the gates of the transistors to control the gate of the 400V MOS transistors. it would only be necessary to choose the timings of the 400V transistors taking into account the gate charging time. of course, you need to check how much current the mos driver will still be able to give and control the 400V transistors according to this value - this will determine the charging time of the gates of these transistors and their timings.
it should work
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