Patent Number: 6,166,924

Title: Device and method of supplying energy from an ac source in an ac to dc converter

Abstract: In an arrangement for supplying energy from an a.c. voltage source that includes a rectifier bridge (D1) and a converter (TR1, D5, C4), an inductor means (L1) is connected between a first output terminal on the rectifier bridge and a valley-fill circuit (10) that includes at least two capacitors (C1, C2). The converter includes a transformer (TR1) having a primary winding which together with a controllable switch means (SW1) is included in a loop that extends from a second output terminal on the rectifier bridge to the interconnection junction between the inductor means and the valley-fill circuit (10). When the absolute value of the source voltage is greater than or approximately equal to a highest intermediate voltage including the voltage across at least one capacitor in the valley-fill circuit, energy is supplied from the source to the inductor means and to the valley-fill circuit. Energy is then supplied to the converter from the source via the inductor means and in parallel from all capacitors (C1, C2) that have said highest intermediate voltage, wherein the amount of source energy supplied is dependent on the voltage (V.sub.C3) across the input of the converter.

Inventors: Assow; Bengt (Norsborg, SE)

Assignee: Telefonaktiebolaget LM Ericsson

International Classification: H02M 1/00 (20060101); H02M 003/335 (); G05T 001/613 ()

Expiration Date: 12/26/2017