Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Silicon controlled rectifier ignition
Patent
1982-07-06
1985-11-12
Chatmon, Saxfield
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Silicon controlled rectifier ignition
315205, 315207, 315244, 315DIG7, 363 22, 363 24, 331113A, H05B 3702, H05B 3904, H05B 4136
Patent
active
045530700
ABSTRACT:
An electronic ballast for a discharge lamp (8) for restricting and stabilizing the lamps current. The ballast comprises a high frequency oscillator for connection to a D.C. supply which consists of two transistors (1,2) connected in series, with a base drive transformer (3) coupled between them to bring the transistors (1,2) into alternating phase operation. A resonance circuit connected in series with the primary winding (4) of the transformer (3), comprises an inductor (7), resonance capacitors (10 and 11) and a capacitor (9) coupled in parallel with the lamp (8). The lamp (8) is, in turn, connected in series with the resonance circuit. In addition, a filter capacitor (c) having a high charging ability is coupled between the terminals of the D.C. supply. The resonance capacitors (10 and 11) are connected in series between the terminals of the D.C. supply, and diodes (23, 24) are connected parallel to them, and the last part of the resonance circuit is connected to a point common for the capacitors and the diodes, e.g. by means of the electrode (8a) of the lamp (8).
REFERENCES:
patent: 2892952 (1959-06-01), McVey
patent: 3896336 (1975-07-01), Schreiner et al.
patent: 4004187 (1977-01-01), Walker
patent: 4075476 (1978-02-01), Pitel
patent: 4127795 (1978-11-01), Knoll
patent: 4237403 (1980-12-01), Davis
patent: 4277728 (1981-07-01), Stevens
patent: 4370600 (1983-01-01), Zansky
Sairanen Martti
Virta Matti
Chatmon Saxfield
OY Helvar
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