A Novel Lower Inductance Quasi-bridgeless Active Power Factor Corrector

Single-phase traditional bridged active power factor corrector (APFC) can utilize analog controller or digital controller, and the voltage drop of noninductive shunt resistor represents the instantaneous value of inductor current for current inner loop control. This method can be directly used in quasi-bridgeless APFC for large output power. In order to adapt to the developing trend of high frequency in APFC, it is necessary to use an AC inductor with a low inductance. Under this condition, the above scheme for measuring the inductor current based on the voltage drop of the shunt resistor is no longer applicable, so the original topology needs to be improved. At the same time, in view of the fast response speed and high immunity of the one cycle controller (OCC), a quasi-bridgeless APFC circuit suitable for low inductances is proposed in this paper. After small-signal analysis model of the topology is established, the voltage compensator is designed based on one cycle control. Finally, the 1.0kW quasi-bridgeless APFC circuit is realized by using IRl155S as the analog controller.