Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Silicon controlled rectifier ignition
Patent
1989-06-02
1991-02-26
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Silicon controlled rectifier ignition
315246, 315DIG5, 315DIG7, 315208, 315244, 363132, H05B 3702, H05B 3900, H02M 75387
Patent
active
049964623
ABSTRACT:
Electronic ballasts are essentially composed of a series connection of a harmonic filter that has its input side connected to the AC line, a rectifier and an inverter to which is connected at least one load circuit composed of a series circuit of an inductor and a parallel circuit composed of a fluorescent tube and a capacitor. When a high electric tolerance is required of such a ballast in view of a desired increase in the power factor, standard circuit designs required a relatively expensive storage capacitor that smooths the AC rectified line voltage. In order to be able to use a storage capacitor that has a lower electric tolerance in comparison to the required voltage tolerance of the ballast, a storage capacitor is incorporated into one of the two capacitor branches of the inverter which is composed of a switch bridge arrangement having two switch branches and two capacitor branches, this storage capacitor being connected in series with the actual load.
REFERENCES:
patent: 4511823 (1985-04-01), Eaton et al.
patent: 4553070 (1985-11-01), Sairanen et al.
"Vorschaltgerate und Schaltungen fur Niederspannungs-Entladungslampen" by C. H. Sturm, Brown Boverie & Cie AG, Mannheim, 5. Auflage, 1974, Seiten 343 und 345.
LaRoche Eugene R.
Shingleton Michael B.
Siemens Aktiengesellschaft
LandOfFree
Electronic ballast for fluoroscent lamps does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electronic ballast for fluoroscent lamps, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electronic ballast for fluoroscent lamps will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-295569