Abstract: A synchronous buck converter for supplying a LED load has a high side switch and a low side switch connected in series. An inductor is connected to the midpoint of these switches, and control circuitry controls the alternate switching operation of the two switches. The switches are controlled such that there are time periods in which a negative current is flowing through the low side switch, and a feedback signal indicating the level of the negative current is supplied to the control circuitry. A switching-off command is issued to the low side switch as soon as the feedback signal reaches or crosses a threshold value. A feedback signal from the LED load is fed back to the control circuitry, the control circuitry adapts its threshold value depending on the feedback signal.

Abstract: The present invention relates to an adapter (1) for connecting a light to a track having mains phases and comprising a housing (2), at least one spring-loaded connector (6.1) linked to the housing (2), and a cover (4) partially covering the housing (2) and having at least one opening (8.1). The cover (4) is displaceable so as to be placed selectively in one of: a position in which the at least one spring-loaded connector (6.1) extends at least partially through the at least one opening (8.1), a position in which the cover (4) covers the at least one spring-loaded connector (6.1).

Abstract: The invention relates to an adaptor for electrically connecting a lighting apparatus to an electrified track, wherein the electrified track comprises AC main phases L1, L2 and L3 and a neutral wire N, wherein the adaptor has a housing designed to be inserted into a U-shaped profile of the electrified track, wherein the adaptor has contacts for contacting the AC main phases L1, L2 and L3 and the neutral wire N of the electrified track, wherein the adaptor comprises an electronic control unit in the housing, wherein the control unit is configured to select a combination of one of the all connected AC main phases L1, L2, L3 with the neutral wire N for supplying the lighting apparatus.

Abstract: An isolated primary side switched converter (100) has a galvanic isolation stage (105) separating a primary side (101) and a secondary side (103). The secondary side winding (107) is connected to a rectification circuit and has a center tap. A first terminal (T1), a second terminal (T2) and a third terminal (T3) are provided for connecting one or more LED loads (LED1, LED2) to the secondary side (103) of the converter (100). The rectification circuit (109) is configured to set the first terminal (T1) at a positive electrical polarity and to set the second terminal (T2) at a negative polarity. The third terminal (T3) is electrically connected to the center tap. One or two LED loads can be connected between T1 and T3 (low voltage) and T2 and T3 (low voltage), or in one embodiment a single LED load can also be connected between T1 and T2 (high voltage).

Abstract: An LED converter for supply of an LED load (18) is provided. The LED converter comprises a switched resonant converter (1) having at least one switch (11, 12) controlled by a control unit of the switched resonant converter (1). The control unit is configured to control a switching operation of the at least one switch (11, 12) such that the switched resonant converter (1) supplies an adjustable constant current (17) to output terminals for the LED load (18). The control unit is further configured to generate the adjustable constant current (17) by alternatingly controlling the at least one switch (11, 12) with one of at least two different, and adaptable, switching frequencies (44, 45) at a time for a respective time period (54, 55), and by adjusting a relative duration of the time periods (54, 55). Thereby, a resolution of an output current of the LED converter for supply of the LED load (18) is improved, which is of particular relevance for dimming applications.

Abstract: The invention relates to an isolated primary side switched converter (100), comprising a galvanic isolation stage (105) separating a primary side (101) and a secondary side (103) of the converter (100), a secondary side winding (107) of the isolation stage (105), wherein the secondary side winding (107) is coupled to a primary side winding, and wherein the secondary side winding (107) comprises a center tap, a first terminal (T1), a second terminal (T2) and a third terminal (T3) for connecting an LED load (LED1, LED2) on the secondary side (103) of the converter (100), a rectification circuit (109) on the secondary side (103) of the converter (100), wherein the rectification circuit (109) is configured to set the first terminal (T1) at a first electrical polarity, and to set the second and the third terminal (T2, T3) at a second electrical polarity that is different to the first electrical polarity, wherein the third terminal (T3) is electrically connected to the center tap, and wherein a voltage between the

Abstract: The invention relates to an adaptor for electrically connecting a lighting apparatus to an electrified track, wherein the electrified track comprises AC main phases L1, L2 and L3 and a neutral wire N, wherein the adaptor has a housing designed to be inserted into a U-shaped profile of the electrified track, wherein the adaptor has contacts for contacting the AC main phases L1, L2 and L3 and the neutral wire N of the electrified track, wherein the adaptor comprises an electronic control unit in the housing, wherein the control unit is configured to select a combination of one of the all connected AC main phases L1, L2, L3 with the neutral wire N for supplying the lighting apparatus.

Abstract: The present invention relates to an adapter (1) for connecting a light to a track having mains phases and comprising a housing (2), at least one spring-loaded connector (6.1) linked to the housing (2), and a cover (4) partially covering the housing (2) and having at least one opening (8.1). The cover (4) is displaceable so as to be placed selectively in one of: a position in which the at least one spring-loaded connector (6.1) extends at least partially through the at least one opening (8.1), a position in which the cover (4) covers the at least one spring-loaded connector (6.1).