公开(公告)号：EP1580639A1

公开(公告)日：2005-09-28

申请号：EP04425199.9

申请日：2004-03-22

Applicant: STMicroelectronics S.r.l.

Inventor： Adragna, Claudio ,  Moriconi, Ugo

IPC: G05F1/70 ,  H02M1/12

CPC classification number: G05F1/70 ,  H02M1/4225 ,  Y02B70/126

Abstract: A transition mode operating device for the correction of the power factor in switching power supply units is described. Said device comprises a converter (20) and a control device (100) coupled to the converter (20) for obtaining from an input network alternated voltage (Vin) a regulated voltage (Vout) at the output terminal. The converter (20) comprises a power transistor (M), a circuit (2) adapted to rectifier said network voltage, an inductor arranged between the rectifier circuit (2) and a non drivable terminal of said power transistor (M), said device for the correction of the power factor comprising an auxiliary winding (L1) of the inductor. The control device (100) comprises first means (3) having in input a first signal (Vr) proportional to said regulated voltage (Vout) and a reference signal (Vref) and being adapted to generate an error signal (Se), a multiplier (4) having in input said error signal (Se) and a driving circuit (70) having in input at least a second signal in output from the multiplier (4) and being adapted to determine the on time period (Ton) and the off time period (Toff) of the power transistor (M). The control device (100) comprises second means (50) connected with said auxiliary winding (L1) of the inductor and adapted to generate at least a third signal (Vm) proportional to the network voltage (Vin) during the on time of said power transistor (M); the third signal (Vm) is in input to said multiplier (4) for generating the second signal (Vc).

公开(公告)号：EP1580639B1

公开(公告)日：2008-05-14

申请号：EP04425199.9

申请日：2004-03-22

Applicant: STMicroelectronics S.r.l.

Inventor： Adragna, Claudio ,  Moriconi, Ugo

IPC: G05F1/70 ,  H02M1/42

CPC classification number: G05F1/70 ,  H02M1/4225 ,  Y02B70/126