Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Silicon controlled rectifier ignition
Patent
1995-08-09
1997-10-14
Pascal, Robert
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Silicon controlled rectifier ignition
315205, 315224, 315247, 363 39, H05B 4136
Patent
active
056776012
ABSTRACT:
To meet IEC regulations in accordance with IEC publication 555-2 class D, r harmonic content of feedback into power networks upon use of low-power fluorescent lamps, an operating circuit for a lamp, or serially connected lamps is provided which includes a rectifier (2), rectifying a-c input energy, and having a smoothing capacitor (C3) connected across its output (J1, J2), the output of which is inverted in a half-bridge inverter using alternately conductive transistors (T1, T2), a passive filter circuit (5) is connected between an electrode of the lamp, or the last electrode of the lamps and a return connection to the rectifier (2). The passive filter circuit (5) has two serially connected diodes (D1, D2) defining a common junction (M2), connected in d-c blocking direction in a connection line between the second electrode (E2, E4') of a lamp (LP1) or the last of a group of serially connected lamps (LP1', LP2') and one (J1) output terminal of the rectifier (2). A first capacitor (C1) is connected to the common junction (M2) between the two diodes (D1, D2), and coupled to the other (J2) of the output terminals of the rectifier (2); and a second capacitor (C2) is connected in parallel across the serially connected two diodes (D1, D2).
REFERENCES:
patent: 4808887 (1989-02-01), Fahnrich et al.
patent: 5068573 (1991-11-01), Bruning et al.
Kinkead Arnold
Pascal Robert
Patent-Treuhand-Gesellschaft F. Elektrische Gluehlampen mbH
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