The SPIC maintenances high power factor and decreases the bus voltage in about 200V. The key of the idea is that the pulse-width of the drive-pulse of the APFC switching is decreased.

• 该方法通过利用对原SPIC中的脉冲进行适当处理，以获得固定占空比较小的脉冲来控制APFC的开关，从而起到了有效降低总线电压，维持较高的功率因数。