Patent ID: 9537385
Date: 2017-01-03
CPC Classifications: G01R,H02M,Y02B,Y02P

Claim:
1. An induction current sampling device for a bridgeless Power Factor Correction (PFC) circuit, connected to the bridgeless PFC circuit, comprising a first sampling unit, a second sampling circuit and a third sampling circuit, wherein the first sampling unit, connected in serial with a first switch transistor of the bridgeless PFC circuit, is configured to sample a current flowing through the first switch transistor to acquire a first sampling signal V 1 ; the second sampling unit, connected in serial with a second switch transistor of the bridgeless PFC circuit, is configured to sample a current flowing through the second switch transistor to acquire a second sampling signal V 2 ; and the third sampling unit, with one terminal connected with a ground of the bridgeless PFC circuit and the other terminal connected with a negative output of a PFC capacitor of the bridgeless PFC circuit, is configured to sample a current flowing through a boost diode of the bridgeless PFC circuit to acquire a third sampling signal V 3 , wherein the first sampling unit is a first sampling resistor or a first current sensing device, the second sampling unit is a second sampling resistor or a second current sensing device, and the third sampling unit is a third sampling resistor or a third current sensing device, when the first sampling unit is the first current sensing device, the second sampling unit is the second current sensing device, and the third sampling unit is the third current sensing device, the first current sensing device comprises a first current transformer CT the second current sensing device comprises a second current transformer CT the third current sensing device comprises a third current transformer CT