Driver arrangement for LED lamps

Details Driver arrangement for LED lamps Driver arrangement for LED lamps

2007-06-13

2010-11-09

Vu, Bao Q (Department: 2838)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

C363S021120

Reexamination Certificate

active

07830094

ABSTRACT:
A driver arrangement for LED light sources includes a transformer having primary and secondary winding connections. A first electronic switch (SW1) controls current flow through the primary winding, and a sensing resistor is coupled to the primary winding to produce a current sensing signal. A second electronic switch (SW2) is sensitive to the sensing signal to switch off SW1as current flow through the primary winding reaches a given threshold. SW1is thus alternatively turned-on and off in alternating turn-on and switch-off phases to power the LED light source via the secondary winding. SW1is a field effect transistor, preferably a MOSFET. The transformer is SELV-rated. The sensing resistor may be a variable resistor to adjust the duration of the on/off phases to permit controlled dimming.

REFERENCES:
patent: 4587506 (1986-05-01), Hoeksma
patent: 5506764 (1996-04-01), Hon et al.
patent: 5668704 (1997-09-01), Higuchi
patent: 6314004 (2001-11-01), Higuchi
patent: 6359525 (2002-03-01), Mohan et al.
patent: 6400102 (2002-06-01), Ghanem
patent: 01-57999 (2001-08-01), None

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