Dear Forum Members,

Almost all of us use soft swithing techniques "Zero cross Switching" for switching AC loads in order to keeps the EMI minimum. Using "zero cross switching" keeps the dv/dt and di/dt at switching minimum and thus the radiated emissions [ radiated noise ] is at the minimum level. Where as in case of the random firing the dv/dt and di/dt may be high and cause more emissions and thus more noise. I am talking about pure resistive loads where the current tries to flow as soon as the swithing is done and causes high dv/dt. Thats known to almost all of us. What I really want to know is is there any mathematical/scientific equation or any Physics theory supporting this noise emissions being correlated with the dv/dt. I have done a lot of googling and searched forum too but couldnt find what I want.
I am using 8051 family micros in the said applicatoin.

Thanks to all of you for reading my post.

Regards,
Prahlad Purohit