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AssigneePatent-Treuhand-Gesellschaft fuer Elertrische Glubhlampen mbH
InventorsAlois Braun, Walter Limmer, Joachim Mühlschlegel
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A step-up converter has a power factor correction, has an input for connection to a supply voltage, in particular a rectified AC voltage; an inductor, a diode and a storage capacitor, which are coupled in a series arrangement between the input and the output, in which the voltage that is dropped across the storage capacitor is provided at the output; a switch, which is coupled between a junction point between the inductor and the diode, on the one hand, and a reference potential, on the other hand; and a drive circuit for the switch which controls the times for which the switch remains closed and open; the drive circuit being designed to control the time for which the switch remains closed as a function of the freewheeling time of the inductor. A method for operating such a step-up converter is also disclosed.
A step-up converter having power factor correction, having
A method for operating a step-up converter having power factor correction, which has an input for connection to a supply voltage (UC1), an inductor (L), a diode (D) and a storage capacitor (C2) coupled in a series arrangement between the input and an output, in which a voltage (UC2) dropped across the storage capacitor (C2) is provided at the output, and a switch (S), which is coupled between a junction point between the inductor (L) and the diode (D) and a reference potential, said method comprising the following steps:
An electronic ballast for driving at least one electric lamp, said electronic ballast including a step-up converter having
Dependencies are inferred from the claim text.