Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Silicon controlled rectifier ignition
Reexamination Certificate
2005-06-24
2008-10-28
Donovan, Lincoln (Department: 2821)
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Silicon controlled rectifier ignition
C315S291000, C315S224000, C315SDIG002
Reexamination Certificate
active
07443103
ABSTRACT:
A method and system to supply current to a high pressure lamp is provided, the method and system comprising an alternating lamp current waveform with a half cycle mean amplitude I1and a half cycle time duration T, a current pulse waveform including at least one current pulse with a half cycle mean amplitude I2and at least one current pulse occurring after the trailing edge of a half cycle of the alternating lamp current, the pulse having a half cycle duration of Tp. These waveforms are combined to generate a current waveform including a current pulse waveform, the current pulse waveform starting after a time delay Td from the trailing edge of a half cycle of the alternating lamp current waveform, the time duration Tp of the at least one current pulse lasting less than the remaining time before the leading edge of the second half cycle of the alternating lamp current waveform. The combined current waveform supplies current to a high pressure lamp and produces a cone shaped tip protrusion which reduces lamp flicker.
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Kaiser, W., et al., “Current pulse fed high-pressure-sodium lamps”,Conference Record of the 2002 IEEE Industry Applications Conference, 37thIAS Annual Meeting, Pittsburgh, PA, Oct. 13-28, 2002, pp. 1499-1504.
Allen Gary R.
Chalmers Alan G.
Gurin Timothy B.
Kotkunde Anjali
Li Jianwu
Alemu Ephrem
Donovan Lincoln
Fay Sharpe LLP
General Electric Company
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