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AN4149 数据表(PDF) 5 Page - STMicroelectronics |
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AN4149 数据表(HTML) 5 Page - STMicroelectronics |
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5 / 43 page  DocID023523 Rev 2 5/43 AN4149 CCM PFC using FOT control then, the switching period TSW will be: Equation 3 In the end, if TOFF is changed proportionally to the instantaneous line voltage, i.e. if: Equation 4 then TSW will be equal to Kt·Vout and, since Vout is regulated by the voltage loop, also TSW (and fSW=1/TSW) will be fixed. This result is based on the sole assumption that the instantaneous line voltage and the output load are such that the boost inductor operates in CCM. Figure 3. Block diagram of an FOT-controlled PFC preregulator OFF OFF OFF OFF ON sw T sin Vpk Vout T T sin Vpk Vout T T T θ = + − θ = + = 1 θ = sin Vpk K T t OFF |
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