| 摘要 |
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. |
