Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Impedance or current regulator in the supply circuit
Patent
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.
Bucks Marcel J. M.
Nijhof Engbert B. G.
Kraus Robert J.
Lee Wilson
U.S. Philips Corporation
Wong Don
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