Discharge lamp lighting circuit

Details Discharge lamp lighting circuit Discharge lamp lighting circuit

2007-11-06

2007-11-06

Chen, Shih-Chao (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Reexamination Certificate

active

11484804

ABSTRACT:
A discharge lamp lighting circuit1is provided with a DC-AC conversion circuit3having a plurality of switching elements 5H, 5L and a series resonance circuit (8, 9, 7p), and control means17for preventing a situation in which the drive frequency of the switching element remains less than its specified minimum frequency. When the discharge lamp is lit, driving control of the switching element is carried out in a frequency range higher than the series resonance frequency. By using a driving situation detection circuit15, a driving situation of the switching element is monitored based on a relation with a phase of a lamp current which flows through the discharge lamp. If the drive frequency of the switching element becomes less than the specified minimum frequency, the drive frequency is increased, and thereby, a lower limit of the drive frequency is automatically restricted.

REFERENCES:
patent: 4700113 (1987-10-01), Stupp et al.
patent: 5978236 (1999-11-01), Faberman et al.
patent: 6504316 (2003-01-01), Ito et al.
patent: 6791279 (2004-09-01), Shearer et al.
patent: 6975077 (2005-12-01), Izumi et al.
patent: 7023143 (2006-04-01), Harada et al.
patent: 7-142182 (1995-06-01), None

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