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Power MOSFET driver for parallel power sources

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aminpix

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I am designing an inverter to convert +24 -24v to AC. my microcontroller is working with 3.3v.
I don't know any proper FET Driver, that its low voltage side works with 0 to 3.3 and its high voltage side works with -24 to +24. like this picture, anybody knows?

broken link removed
 

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Your +3.3V can drive an NPN, which in turn turns on a PNP. (They resemble a sziklai pair.) This method allows the PNP to turn off automatically, as its bias terminal is referenced to the positive supply rail.

(My simulation uses transistors instead of mosfets.)

5328907200_1463033458.png


A symmetrical arrangement will drive the negative section. However it needs a bias signal of negative polarity. Therefore you need -3.3V. You would need to add more circuitry, to be able to turn the negative section on and off.
 

Do you know any particular IC for that?
It is easier to use an IC rather than using BJT solution.
 

Hi,

You didn´t specify anything but voltage.
* load current
* switching frequency
...

Maybe a MAX14756/-7/-8 can also do the job.

*****
that its low voltage side works with 0 to 3.3 and its high voltage side works with -24 to +24.
Click to expand...
It´s not low voltage and high voltage... its input side and output side.

Klaus
 

I plan to make an inverter, so the MOSFET current will be over 10A.
 

BradtheRad said:
Your +3.3V can drive an NPN, which in turn turns on a PNP. (They resemble a sziklai pair.) This method allows the PNP to turn off automatically, as its bias terminal is referenced to the positive supply rail.

(My simulation uses transistors instead of mosfets.)

5328907200_1463033458.png


A symmetrical arrangement will drive the negative section. However it needs a bias signal of negative polarity. Therefore you need -3.3V. You would need to add more circuitry, to be able to turn the negative section on and off.
Click to expand...

This circuit looks working but Vbias is between 3.3 and -3.3. but the micro-controller can only generate 0 to 3.3v.
 

aminpix said:
This circuit looks working but Vbias is between 3.3 and -3.3. but the micro-controller can only generate 0 to 3.3v.
Click to expand...

My simulation was merely to illustrate the concept. There are circuits which produce a negative polarity from a positive.

An optocoupler could be a solution (suggested in post #3). Things are simplified then, because you already have the -24V supply available.
 

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