Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Silicon controlled rectifier ignition
Patent
1993-12-22
1995-06-13
Pascal, Robert J.
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Silicon controlled rectifier ignition
315106, 315224, 315307, 315DIG5, 315DIG7, H05B 3702
Patent
active
054246130
ABSTRACT:
A gas-discharge lighting system having an inductor and at least two capacitors in combination with a gas discharge lamp, the inductor and capacitors forming a resonant system, the resonant frequency thereof being dependent upon whether the lamp is nonionized or ionized. The lamp is operated by driving the lamp, inductor, and capacitor combination with a signal of a first polarity and inverting the polarity when the signal current transitions a predetermined current level. This repeated until the polarity of the signal remains of one polarity longer than a predetermined time, at which time the signal is inverted. This is repeated indefinitely. The predetermined length of time is one-half the inverse of a minimum frequency greater than the ionized resonant frequency. To protect the lighting system from overload, if the signal current exceeds a predetermined level, then the polarity of the signal is inverted, effectively moving the frequency of the signal up away from the ionized resonant frequency, thereby reducing the power delivered to the lamp. This method is applicable to fluorescence lighting and other gas-discharge lamps, such as mercury and sodium vapor lamps.
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patent: 5122712 (1992-06-01), Hirschmann
"Telefunken Application Note", (Date Unknown) pp. 1 through 6.
"Electronic Ballasts", PCIM, Apr. 1987, R. J. Haver, Motorola, Inc., pp. 52 through 56 and 58.
"International Rectifier Application Note 973", (Date Unknown) Peter N. Wood, pp. 229 through 236.
"1.9 Electronic ballast for flourescent lamps", Siemens (?), (Date Unknown) p. 34.
AT&T Corp.
McLellan Scott W.
Pascal Robert J.
Philogene Haissa
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