Converter circuit with controllable switching means...

Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter

Reexamination Certificate

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Details

C363S021050, C363S021130, C363S097000

Reexamination Certificate

active

06850422

ABSTRACT:
A converter for converting an input voltage (Ui) between a first supply terminal (1) and a second supply terminal (2) to an output voltage (U0), which converter includes switching means (S0) which, in the operating state of the converter, are alternately switched on and off under the control of a control signal (Vcntrl), an inductive element (T) which, in conjunction with the switching means (S0), forms a series circuit which is coupled between the first supply terminal (1) and the second supply terminal (2), a control circuit (CNTRL) for supplying the control signal (Vcntrl), and evaluation means (EVMNS) for evaluating a voltage (US) across the switching means (S0), which voltage (US) exhibits ringing, and for supplying the control circuit (CNTRL) with information causing the switching on of the switching means (S0) during a given valley of the voltage (US) across the switching means (S0). The converter remains locked to said valley for as long as the frequency of the control signal (Vcntrl) is within a given frequency window. The converter also includes a frequency control circuit (FC) for controlling the frequency of the control signal (Vcntrl) within the frequency window. If the frequency reaches the lowest frequency or the highest frequency of the frequency window, the information is adapted in such a way that the converter is locked to another valley of the voltage (US) across the switching means (S0), so that the frequency of the control signal (Vcntrl) remains within the frequency window.

REFERENCES:
patent: 5754414 (1998-05-01), Hanington
patent: 5991172 (1999-11-01), Jovanovic et al.
patent: 6370045 (2002-04-01), Lurkens
patent: 6445598 (2002-09-01), Yamada
patent: PCTEP00/04377 (2000-12-01), None

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