APPARATUS AND METHOD FOR SAMPLING INDUCTOR CURRENT OF BRIDGELESS PFC CIRCUIT

摘要

Disclosed are an apparatus and a method for sampling inductor current of a bridgeless PFC circuit. The apparatus comprises a first sampling unit, a second sampling unit, and a third sampling unit. The apparatus for sampling current of the bridgeless PFC circuit is connected to a bridgeless PFC circuit. The first sampling unit is connected in series to a first switch tube (S1) of the bridgeless PFC circuit, and is used for sampling current passing through the first switch tube (S1) to acquire a first sampled signal V1. The second sampling unit is connected in series to a second switch tube (S2) of the bridgeless PFC circuit, and is used for sampling current passing through the second switch tube (S2) to acquire a second sampled signal V2. One end of the third sampling unit is connected to a ground terminal of the bridgeless PFC circuit, the other end is connected to a negative output terminal of a PFC capacitor (C1) of the bridgeless PFC circuit, and is used for sampling current passing through a boost diode of the bridgeless PFC circuit to acquire a third sampled signal V3.