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how does IR21362 handle 3 phase pwm signals to determine + or - half-cycles

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brasky

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Hello,

Please, I would like to know how the IR21362 chip handles the 3 phase pwm signals from microcontroller to determine the positive and negative half-cycles of each phase. I have pulled my hairs trying to figure that from the Microchip AN843 app note. I understand clearly from code, how the positive half-cycle of each phase is generated. But the negative half-cycle is not covered in code, does the IR21362 automatically handles that?
 

I believe the negative part is produced in hardware- you need to use the chip with a bridge circuit. You will need two mosfets for each phase but each phase is rather independent. When the upper mosfet is turned on, you get current in the load in one direction but when the lower mosfet is turned on, the current reverses through the load.
 
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