Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Reexamination Certificate
2007-10-09
2007-10-09
Han, Jessica (Department: 2838)
Electricity: power supply or regulation systems
Output level responsive
Using a three or more terminal semiconductive device as the...
C323S285000, C323S299000
Reexamination Certificate
active
10877439
ABSTRACT:
A device is provided for the correction of the power factor in forced switching power supplies. The device includes a converter, and a first control circuit coupled with the converter so as to obtain a regulated voltage on the output terminal from an alternating network input voltage. The converter includes a power transistor, and the first control circuit is suitable for driving the power transistor in every switching cycle comprising the turn-on time and the turn-off time of the power transistor. The device for the correction of the power factor further includes a second control circuit coupled to the first control circuit and capable of modulating the turn-off time of the power transistor.
REFERENCES:
patent: 6476589 (2002-11-01), Umminger et al.
patent: 6580258 (2003-06-01), Wilcox et al.
patent: 7075277 (2006-07-01), Ishii et al.
Adragna Claudio
Gattavari Giuseppe
Bongini Stephen
Fleit Kain Gibbons Gutman Bongini & Bianco P.L.
Han Jessica
Jorgenson Lisa K.
STMicroelectronics S.r.l.
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