Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Silicon controlled rectifier ignition
Reexamination Certificate
2005-11-15
2005-11-15
Lee, Wilson (Department: 2821)
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Silicon controlled rectifier ignition
C315S291000
Reexamination Certificate
active
06965204
ABSTRACT:
The invention relates to a ballast arrangement for igniting and operating a discharge lamp. The lamp is connected in a commutating bridge in series with an inductor and in parallel with a capacitor. The conductor and the capacitor jointly form a resonance circuit during an ignition phase. The bridge is then commutated at a comparatively high frequency. After the ignition phase, the lamp reaches a run-up phase, leading to a stable-operation phase. In the stable-operation phase, the bridge is commutated at a low frequency. According to the invention, the commutation frequency is lowered in steps from the comparatively high frequency during the ignition phase to the low frequency of the stable-operation phase so as to optimize current supply during the run-up phase.
REFERENCES:
patent: 4463286 (1984-07-01), Justice
patent: 5434479 (1995-07-01), Ohnishi et al.
patent: 5932976 (1999-08-01), Maheshwari et al.
patent: 6590351 (2003-07-01), Huber
patent: 0408121 (1995-06-01), None
patent: 0893943 (1999-01-01), None
Koninklijke Philips Electronics , N.V.
Lee Wilson
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