Tridonic Gmbh Co. Kg

Ludwig Erasmus De Clercq

Frank Lochmann

Harald Netzer

Stefan Stark

Lukas Saccavini

Joan Ortega

Clemens Kucera

The invention relates to a synchronous flyback converter () having terminals for supplying an LED load. The synchronous flyback converter () comprises a sensing winding (L) coupled to a primary winding (L) of a transformer T of the flyback converter (), a control unit () controlling a primary side switch (S) in series to the primary winding (L) of the flyback converter () using a feedback signal for a closed loop control of a secondary side voltage of the flyback converter () by controlling the frequency and/or duty cycle of the switching of the primary side switch (S), wherein the feedback signal is derived from a sensing voltage across the sensing winding (L) sampled once during a switch-on time of a secondary side switch (S) of the flyback converter ().

Synchronous flyback converter for driving LED loads

A switched power converter () is arranged for supplying lighting means () as a load, having at least one (M, M) switch controlled by a control unit (),

Switched power converter system

The invention relates to a synchronous converter () comprising a transformer (A,B) having a predefined winding ratio, which couples a supply-side () and a load side () of the synchronous converter (), which are each allocated limit current intensities (&#x2033;); detection means (), which are configured to detect a current intensity () on one side () from the supply side () and the load side (); conversion means (), which are configured to provide the limit current intensities (&#x2033;) from the other side () from the supply-side () and the load side (), converted via the predefined winding ratio, as corresponding limit current intensities (**) on the one side (); and comparison means (), which are configured to compare the detected current intensity () with the limit current intensities (&#x2033;) of the one side () and with the corresponding limit current intensities (**) on the one side ().

Synchronous converter having under- and overcurrent protection

The present invention relates to a synchronous flyback converter circuit () for operating an illuminant line () having at least one illuminant (), more particularly having at least one light emitting diode, the synchronous flyback converter circuit () comprising: a transformer (T), having a primary winding (Np), which is electrically connected to a first switch (S), and a secondary winding (Ns), which is electrically connected to an output (A, A') of the synchronous flyback converter circuit via a second switch (S), the illuminant line () being able to be connected to the output; and a control unit (), which is designed to control the first switch (S) and the second switch (S). According to a first embodiment according to the invention, the synchronous flyback converter circuit () comprises a sensing circuit (), which is designed to capture a temporal mean of the switch current (IS) flowing through the first switch (Si) and to feed at least one signal (Sg) conveying said temporal mean to the control unit (), the control unit () being designed to separately determine, on the basis of the signal (Sg) fed from the sensing circuit (), a temporal mean of the positive component of the switch current (IS) flowing through the first switch (Si) and a temporal mean of the negative component of the switch current (IS) flowing through the first switch (S). According to a second embodiment according to the invention, the synchronous flyback converter circuit () comprises a sensing circuit (), which is designed to separately capture a temporal mean of the positive component of the switch current (IS) flowing through the first switch and a temporal mean of the negative component of the switch current (IS) flowing through the first switch and to feed a first signal conveying the temporal mean of the negative component of the switch current (IS) and a second signal conveying the temporal mean of the positive component of the switch current (IS) to the control unit ().

Synchronous flyback converter circuit for operating an illuminant line

The aim of the invention, as demonstrated in various examples, is to control a current flow to an electrical load, e.g. a light emitting diode, in a particularly precise manner. For this purpose, control gear () comprising a DC-DC switching controller () is used in various examples.

Control gear for an electrical load and method

A flyback converter () for operating one or more lighting means, wherein the flyback converter () has a transformer and the transformer is arranged between a primary side of the flyback converter () and a secondary side of the flyback converter (), wherein the flyback converter () is configured, and wherein the flyback converter () has a current detection circuit () that is configured to detect the current flowing through the secondary side of the flyback converter (). The current detection circuit () can have a current detection transformer (). The flyback converter () can be configured such that the current flowing through the secondary side of the flyback converter () flows in a negative direction at least some of the time.

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Dornbirn, Austria

Ludwig Erasmus De Clercq