Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Patent
1999-04-30
2000-02-01
Philogene, Haissa
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
315244, 315209R, 315DIG5, 315DIG7, G05F 100
Patent
active
060206918
ABSTRACT:
A circuit arrangement and control thereof for igniting a high intensity discharge (HID) lamp, for reducing the high frequency ripple superimposed on the low frequency rectangular waveform lamp current after ignition, and for increased circuit efficiency. The high frequency ignition voltage is only applied to the lamp during ignition phase and is mainly generated by the second stage of the low pass (LP) filter. The first stage of the LP filter whose resonant frequency is below the second stage further attenuates the high frequency ripple current through the lamp in normal operation. The resulting lamp current is a low frequency rectangular wave with less than 10% high frequency ripple. Acoustic resonance is avoided. The inductor in the first stage of LP filter is operated in discontinuous current mode. Doing so, the active switches are in zero current switching (ZCS) to maximize the circuit efficiency.
REFERENCES:
patent: 4904907 (1990-02-01), Allison et al.
patent: 4912374 (1990-03-01), Nagase et al.
patent: 5428268 (1995-06-01), Melis et al.
patent: 5491386 (1996-02-01), Eriguchi et al.
Goriki Takeshi
Sun Yiyoung
Matsushita Electric Works R & D Laboratory, Inc.
Philogene Haissa
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