T
treez
Guest
Hello,
We have done an offline, 240VAC PFC’d Flyback LED driver. We have a slight failure of conducted emissions at 30MHz, as attached. In order to combat this, we wish to use two common mode chokes instead of just one like we have at the moment. That is, we wish to have a 10mH common mode choke, and a 500uH common mode choke in cascade…we believe that the smaller one will help attenuate our 30MHz problem.
The problem is that we currently only have one PCB and the scan session is on Monday. The PCB is very densely populated. So anyway, we cant layout a new PCB in time. …What about if we de-solder the existing common mode choke, and then use twisted pair “flying wires to “jump” over to a bit of stripboard, on which we will mount the two replacement common mode chokes as discussed?
Will this modified setup create so many other EMC problems that it won’t be a valid and worthwhile test?
We have done an offline, 240VAC PFC’d Flyback LED driver. We have a slight failure of conducted emissions at 30MHz, as attached. In order to combat this, we wish to use two common mode chokes instead of just one like we have at the moment. That is, we wish to have a 10mH common mode choke, and a 500uH common mode choke in cascade…we believe that the smaller one will help attenuate our 30MHz problem.
The problem is that we currently only have one PCB and the scan session is on Monday. The PCB is very densely populated. So anyway, we cant layout a new PCB in time. …What about if we de-solder the existing common mode choke, and then use twisted pair “flying wires to “jump” over to a bit of stripboard, on which we will mount the two replacement common mode chokes as discussed?
Will this modified setup create so many other EMC problems that it won’t be a valid and worthwhile test?