T
treez
Guest
Offline LED drivers use primary side control (via the bias winding) in order to regulate the output LED current when triac dimming is used.
eg the linkswitch ph family....
http://www.powerint.com/linkswitch-ph
Surely one cannot achieve tight regulation of output via the bias winding?, since after all, it is separated from the secondary (output) by the isolation barrier , and so coil coupling will be loose between bias winding and secondary winding.
Therefore, it is likely that one's output power could be more than its supposed to be with primary side control, and this represents inefficiency....would you agree with this?
eg the linkswitch ph family....
http://www.powerint.com/linkswitch-ph
Surely one cannot achieve tight regulation of output via the bias winding?, since after all, it is separated from the secondary (output) by the isolation barrier , and so coil coupling will be loose between bias winding and secondary winding.
Therefore, it is likely that one's output power could be more than its supposed to be with primary side control, and this represents inefficiency....would you agree with this?