Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Silicon controlled rectifier ignition
Reexamination Certificate
2007-07-03
2007-07-03
Tran, Thuy Vinh (Department: 2821)
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Silicon controlled rectifier ignition
C315S291000, C315S362000
Reexamination Certificate
active
11196259
ABSTRACT:
It is an object of the present invention to provide a high pressure discharge lamp capable of shifting to arc discharge without going out at initial lighting. The object of the invention is achieved by a high discharge lamp in which mercury of 0.15 mg/mm3is enclosed, and a power supply apparatus. The power supply apparatus comprises a chopper circuit including a switching element, and a smoothing circuit including at least one smoothing capacitor connected to an output terminal of the chopper circuit, and a feedback system control circuit which drives the switching element of the chopper circuit, wherein a parallel circuit comprising a resistor and a second switching circuit is in series connected to an output terminal of the smoothing circuit, and at least at time of initial lighting, the second switching circuit is turned off, and when the lamp is stabilized, the second switching element is turned on.
REFERENCES:
patent: 6005356 (1999-12-01), Horiuchi et al.
patent: 6225754 (2001-05-01), Horiuchi et al.
patent: 318873 (2001-05-01), None
patent: 2002-343588 (2002-11-01), None
Arimoto Tomoyoshi
Suzuki Yoshikazu
Radar Fishman & Grauer PLLC
Tran Thuy Vinh
Ushio Denki Kabushiki Kaisha
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