Circuit arrangement for controlling luminous flux produced by a

Details Circuit arrangement for controlling luminous flux produced by a Circuit arrangement for controlling luminous flux produced by a

1998-08-03

2000-04-18

Wong, Don

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

315307, 315247, H05B 3703

Patent

active

060519355

ABSTRACT:
A circuit arrangement for driving a light source includes input terminals (T1, T2) for deriving a supply current from a supply source; a circuit I for generating a control signal S; a circuit II, provided with a converter which is fitted with at least one switching element (13) and with a control circuit (17) which triggers the switching element with high frequency in a manner which is dependent on the value of the control signal S; a circuit III for generating a voltage Sc which is a measure for an instantaneous value of a supply voltage delivered by the supply source, the voltage Sc acting as a reference signal which causes the circuit I to generate a control signal S which lies alternately in a first range and in a second range, and the circuit II causing the drawing of a comparatively strong supply current (Iv1) at a value of the control signal S which lies in the first range, and the drawing of a comparatively weak supply current (Iv2) at a value of the control signal S which lies in the second range; and output terminals (T3, T4) coupled to the circuit II for connection to a light source (LI).

REFERENCES:
patent: 3913002 (1975-10-01), Steigerwald et al.
patent: 4812736 (1989-03-01), Albach et al.
patent: 4900989 (1990-02-01), Suenaga et al.
patent: 5459478 (1995-10-01), Bolger et al.
patent: 5532526 (1996-07-01), Lammers
patent: 5654611 (1997-08-01), Yamamoto et al.

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