Device for the correction of the power factor in forced switching power supplies

摘要

The following device refers to a device for the correction of the power factor in forced switching power supplies. Said device comprises a converter and a control circuit coupled with said converter so as to obtain a regulated voltage on the output terminal from an alternated network input voltage; the converter comprises a power transistor and the control circuit is suitable for driving said power transistor in every switching cycle comprising the turn-on time and the turn-off time of said power transistor. The device for the correction of the power factor comprises control means coupled to said control circuit and capable of modulating the turn-off time of said power transistor.