Switched-mode power supply having a delay-insensitive timing in

Details Switched-mode power supply having a delay-insensitive timing in Switched-mode power supply having a delay-insensitive timing in

1998-03-03

1999-05-04

Tso, Edward H.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

363 97, 363 79, 323285, H02M 3335

Patent

active

059010525

ABSTRACT:
A flyback converter including a transformer (6) having a primary winding (4) and a switching transistor (2), arranged in series therewith; control device (14) for closing the switching transistor (2) during a primary interval and opening the switching transistor (2) during a secondary interval in response to a control signal (U.sub.c), an auxiliary winding (12) for generating a feedback signal (U.sub.FB), measurement device (20) for unidirectionally measuring the feedback signal (U.sub.FB), a comparator (16) and a logic circuit (18) for deriving from the feedback signal (U.sub.FB) a first timing signal (TM.sub.1) which is representative of the secondary interval; comparison device for comparing the unidirectionally measured feedback signal (I.sub.FB) with a reference signal (I.sub.R) during the secondary interval, and an integrator (28) for generating the control signal (U.sub.C) in response to the comparison. The switched-mode power supply further includes a logic circuit (32) for generating a second timing signal (TM.sub.2) having a starting instant which falls within the primary interval having an end instant which at least does not precede the end instant of the secondary interval. A first time-selective element (26) transfers the reference signal (I.sub.R) under command of the first timing signal (TM.sub.1), and a second time-selective element (30) transfers the unidirectionally measured feedback signal (I.sub.FB) under command of the second timing signal (TM.sub.2). As a result of this, the output voltage of the flyback converter is not affected by errors which are caused by a delay in the generation of the first timing signal (TM.sub.1).

REFERENCES:
patent: 5424933 (1995-06-01), Illingworth
patent: 5757625 (1998-05-01), Schoofs
patent: 5831839 (1998-11-01), Pansier

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