LED RETROFIT DRIVER CIRCUIT AND METHOD OF OPERATING THE SAME

WIPO Patent Application WO/2012/156891

A3

A LED retrofit driver circuit (3) is provided, comprising at least an input (6) for receiving an operating voltage from a power supply (2), an output (8) for connection to one or more LED units (5), a power converter (7) connected with said input (6) and said output (8) and configured to provide a lamp current (50) at said output (8) during operation in at least a first and a second operating state. To provide a versatile circuit (3), allowing operation with a variety of power supplies and under various load conditions, in said first operating state, the power converter (7) is adapted to switch between a high current generating mode (40), in which the power converter (7) is configured to draw current pulses from said power supply (2) to provide a first average input current (33a), and an OFF mode (42) in which no current is drawn from said power supply (2). In said second operating state, said power converter (7) is adapted at least to operate in a low current generating mode (41), in which the power converter (7) is configured to draw a current from said power supply (2) to provide a second average input current (33b)which is lower than said first average input current (33a).

TOUSAIN ROBERTUS LEONARDUS (NL)
EDDEANE REDOUANE (NL)
CLAESSENS DENNIS JOHANNES ANTONIUS (CN)
VAEL PHILIP LOUIS ZULMA (BE)
JIANG JACK (NL)

PCT/IB2012/052384

January 10, 2013

May 14, 2012

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KONINKL PHILIPS ELECTRONICS NV (NL)
TOUSAIN ROBERTUS LEONARDUS (NL)
EDDEANE REDOUANE (NL)
CLAESSENS DENNIS JOHANNES ANTONIUS (CN)
VAEL PHILIP LOUIS ZULMA (BE)
JIANG JACK (NL)

H05B44/00

WO2011033415A1	2011-03-24
WO2010005291A1	2010-01-14

VAN EEUWIJK, Alexander, H., W. et al. (Building 44, AE Eindhoven, NL)

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