LED switching arrangement for enhancing electromagnetic...

Details LED switching arrangement for enhancing electromagnetic... LED switching arrangement for enhancing electromagnetic...

2005-07-26

2005-07-26

Vo, Tuyet Thi (Department: 2821)

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Discharge control discharge device load

C315S276000, C315S279000, C363S089000, C363S016000

Reexamination Certificate

active

06922022

ABSTRACT:
The invention relates to a switching arrangement for operating at least one LED, which switching arrangement is provided with input terminals (1, 2) for connecting a supply source, —output terminals (3, 4) for connecting the LED to be operated, —a first series circuit (I) between one of the input terminals (1) and one of the output terminals (3), including at least a self-inductance (L), a capacitor (C) and a diode (D), —a second series circuit (II) between the input terminals, including at least the self-inductance (L) and a switching element (S) which is alternately switched to a conducting state and a non-conducting state at a high frequency, —a third series circuit (III) between the output terminals, including the diode and an inductive winding (SW). According to the invention, the inductive winding forms a first winding (SW1) of a transformer (T) which has a second winding (SW2) that forms part of the first series circuit and which also has a connection point with the first winding.

REFERENCES:
patent: 5682306 (1997-10-01), Jansen
patent: 6088242 (2000-07-01), Koegel et al.

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