Step-up converter having power factor correction

Details Step-up converter having power factor correction Step-up converter having power factor correction

H - Electricity

02

M

H02M 5/38 (2006.01) H02M 5/06 (2006.01) H02M 5/34 (2006.01) H02M 1/00 (2006.01)

Patent

CA 2484687

The present invention relates to a step-up converter having power factor correction, having an input for connection to a supply voltage (U C1), in particular a rectified AC voltage; an inductor (L), a diode (D) and a storage capacitor (C2), which are coupled in a series arrangement between the input and the output, in which the voltage (U C2) that is dropped across the storage capacitor (C2) is provided at the output; a switch (S), which is coupled between a junction point between the inductor (L) and the diode (D), on the one hand, and a reference potential, on the other hand; and a drive circuit (10) for the switch (S) which controls the times (dt e; dt a) for which the switch (S) remains closed and open; the drive circuit (10) being designed to control the time (dt e) for which the switch (S) remains closed as a function of the freewheeling time (dt a) of the inductor (L). Moreover, it relates to a method for operating such a step-up converter.

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