Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Impedance or current regulator in the supply circuit
Reexamination Certificate
2005-05-10
2005-05-10
Tran, Thuy Vinh (Department: 2821)
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Impedance or current regulator in the supply circuit
C315S307000, C315S360000, C315SDIG007
Reexamination Certificate
active
06891336
ABSTRACT:
A high-pressure discharge lamp lighting apparatus including a DC power source, an inverter, and a resonator is presented. The apparatus also includes an inverter controller for controlling the inverter according to its variable frequency oscillation function by selectively impressing a first frequency in a stable operation window free from causing acoustic resonance in the high-pressure discharge lamp, and a second frequency higher than the first frequency to the inverter, a lamp wattage detector, and a time ratio controller for controlling a time ratio of an operation time at the first frequency and an operation time at the second frequency so that the inverter outputs are alternately impressed to the high-pressure discharge lamp at an adequate time at the first frequency and the second frequency. The time ratio is based on a lamp voltage of the discharge lamp detected in the steady lighting state using the lamp wattage detector.
REFERENCES:
patent: 5063490 (1991-11-01), Maehara et al.
patent: 5491386 (1996-02-01), Eriguchi et al.
patent: 5569984 (1996-10-01), Holtslag
patent: 5623187 (1997-04-01), Caldeira et al.
patent: 5828185 (1998-10-01), Fellows et al.
patent: 5914572 (1999-06-01), Qian et al.
patent: 5936358 (1999-08-01), Okamoto et al.
patent: 5998939 (1999-12-01), Fellows et al.
patent: 6686703 (2004-02-01), Erhardt et al.
patent: 20020192391 (2002-12-01), Wada et al.
patent: 2000-58284 (2000-02-01), None
patent: 2002-42732 (2002-02-01), None
Pillsbury Winthrop Shaw & Pittman LLP
Toshiba Lighting & Technology Corporation
Tran Thuy Vinh
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