MOSFET KILLER
New Member
Hello All,
I have been designing a high speed optocoupler circuit for a pair of halfbridge gate drivers. My design uses a NOR latch and the leading edges of the optocoupler waveforms cause it to change states. The NOR gate that turns on first is unpredictable and if the wrong one turns on first before the OFF optocoupler switches it off it would trip my desaturation detection circuit and shut down the whole thing.
Questions:
1. How would I make sure that the right NOR gate changes state first when power is applied?
2. What would happen if both optocouplers were on at the same time?
I have been designing a high speed optocoupler circuit for a pair of halfbridge gate drivers. My design uses a NOR latch and the leading edges of the optocoupler waveforms cause it to change states. The NOR gate that turns on first is unpredictable and if the wrong one turns on first before the OFF optocoupler switches it off it would trip my desaturation detection circuit and shut down the whole thing.
Questions:
1. How would I make sure that the right NOR gate changes state first when power is applied?
2. What would happen if both optocouplers were on at the same time?