Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1997-09-11
1998-11-03
Berhane, Adolf
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
323285, H02M 3335
Patent
active
058318399
ABSTRACT:
A switched-mode power supply includes a transformer (T) with a primary winding (Lp), a secondary winding (Ls), and an auxiliary winding (La). A series arrangement of the primary winding (Lp) and a controllable switching element (S1) receives an input voltage (Vi). A drive circuit (1) supplies a drive signal to a control input of the controllable switching element (S1) for periodically switching the controllable switching element (S1) on and off. The secondary winding (Ls) supplies a DC output voltage (Vout) to a load (Z) via a rectifier element (D). The DC output voltage (Vout) is stabilized by averaging (21), during a certain period of time, information (Im;Id) related to feedback information (Va;Icon) supplied by the auxiliary winding (La). The certain period of time is obtained by detecting when the feedback information (Va;Icon) is larger than a certain reference value (Vref;Iref2) which is selected in such a way that a substantial part of both the leading and trailing edges of the feedback information (Va;Icon) do not occur within the certain period of time.
REFERENCES:
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patent: 4073003 (1978-02-01), Chambers
patent: 4456872 (1984-06-01), Froeschle
patent: 5008796 (1991-04-01), Johnson
patent: 5305192 (1994-04-01), Bonte et al.
patent: 5412556 (1995-05-01), Marinus
patent: 5438499 (1995-08-01), Bonte et al.
patent: 5675480 (1997-10-01), Stanford
patent: 5757625 (1998-05-01), Schoofs
Berhane Adolf
Goodman Edward W.
U.S. Philips Corporation
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