Fairchild FAN9612双BCM BFC控制器方案
FAN9612: Interleaved Dual BCM PFC Controller
The FAN9612 Interleaved Dual Boundary-Conduction-Mode (BCM)
Power-Factor-Correction Controller operates two parallel-connected boost power trains 180º out of phase. Interleaving extends the maximum practical power level of the control technique from about 300W to greater than 800W. Unlike the continuous conduction mode (CCM) technique often used at higher power levels, BCM offers inherent zero-current switching of the boost diodes (no reverse-recovery losses), which permits the use of less expensive diodes without sacrificing efficiency. Furthermore, the input and output filters can be made smaller due to ripple current cancellation and effective doubling of the switching frequency.
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