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Full Bridge Inverter MOSFET Switching Sequence

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Akshaydpal

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For +ve half cycle Q1 =PWM1 Q4= ON Q2=Q3=OFF
For -ve half cycle Q3= PWM2 Q2 =ON Q1=Q4=OFF

PWM1 is 180 out of phase with PWM2
generated from Pic micro controller

in the above sequence high side MOSFET are given PWM and Low side are just turned ON and OFF as required

is IT POSSIBLE TO INVERT this sequence means
for +ve half cycle Q1 =ONQ4= PWM1 Q2=Q3=OFF
For -ve half cycle Q3= ONQ2 =PWM2 Q1=Q4=OFF

will there be any complications or it will just work fine practically ??

 

1. It's possible. Consider that 100 percent duty cycle isn't supported by usual high side MOSFET drivers, ins case you are implementing the discussed PWM scheme with a MOSFET bridge.

2. Free-wheeling PWM operation can be acceptable for IGBT or BJT switches that can't conduct reverse current, but causes excessive losses with MOSFET bridges which should be better operated synchronously.

3. The discussed PWM scheme isn't good for inverters because it can't drive reactive loads appropriately. Learn about two- and three-level modulation schemes.
 
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