Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Impedance or current regulator in the supply circuit
Reexamination Certificate
2006-11-28
2006-11-28
Le, Hoanganh (Department: 2821)
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Impedance or current regulator in the supply circuit
C315S226000, C315S291000
Reexamination Certificate
active
07141937
ABSTRACT:
A full bridge circuit including four switching elements (Q1to Q4) is alternated with a high switching frequency and a series-connected resonance circuit (5) including an inductor (L2) and a capacitor (C2) is made to resonate at a switching frequency of the full bridge circuit multiplied by an integer (for example, frequency multiplied by three), thereby generating a high voltage pulse for start up. After a high-pressure discharge lamp (DL) is started up, the full bridge circuit is alternated with a low switching frequency so as to operate as a step-down chopper for inverting the output polarity, thereby stably supplying rectangular wave voltage of low frequency to the high-pressure discharge lamp (DL) via a filter circuit including an inductor (L1) and a capacitor (C1).
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Kishimoto Akihiro
Konishi Hirofumi
Kumagai Jun
Greenblum & Bernstein P.L.C.
Le Hoang-anh
Le Tung
Matsushita Electric & Works Ltd.
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