Dimmer protection for compact fluorescent

Details Dimmer protection for compact fluorescent Dimmer protection for compact fluorescent

1996-10-17

1998-11-24

Wong, Don

Electric lamp and discharge devices: systems

With automatic shunt and/or cutout

315224, 315225, H05B 3702

Patent

active

058412387

ABSTRACT:
A circuit arrangement for operating a discharge lamp (LA), provided with input terminals (K1, K2) for connection to a supply voltage source. A rectifier (D1-D4) is coupled to the input terminals for rectifying a supply voltage delivered by the supply voltage source. A capacitor (C2) is coupled to the rectifier and a DC-AC converter (III) is coupled to the capacitor and is provided with terminals for accommodating a discharge lamp. The circuit arrangement is also provided with a circuit I (R1-R6. T1, T2, C1, V, VI, VII) for detecting periodic current pulses having an amplitude greater than a given value W1 and with a circuit II (IIa, S1) coupled to the circuit I for changing the operational state of the circuit arrangement. As a result, damage to the circuit arrangement is prevented when the circuit arrangement is used in combination with a dimmer unsuitable for the circuit arrangement.

REFERENCES:
patent: 4554487 (1985-11-01), Nilssen
patent: 4647820 (1987-03-01), Chermin et al.
patent: 4935672 (1990-06-01), Lammers et al.
patent: 5151631 (1992-09-01), Oda et al.
patent: 5461287 (1995-10-01), Russell et al.

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