Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Impedance or current regulator in the supply circuit
Patent
1987-03-09
1987-12-01
Dixon, Harold
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Impedance or current regulator in the supply circuit
315210, 315226, 315242, 315244, 315290, 315DIG7, H05B 3700
Patent
active
047106824
ABSTRACT:
A circuit for operating low-pressure discharge lamps at elevated frequency comprises a reconnect circuit which disables the disconnect circuit upon exchange of a defective low-pressure discharge lamp (LP1). The disconnect circuit comprises a diode (D10), a resistor (R11) and a thyristor (TH) together with a trigger circuit (5). The reconnect circuit comprises a capacitor (C9) and a resistor (R12). Upon removal of the defective low-pressure discharge lamp (LP1), the capacitor (C9) is charged over the resistor (R12). Upon insertion of a new low-pressure discharge lamp (LP1), the capacitor (C9) is discharged and recharged in opposite direction and the holding current is removed from the thyristor (TH). This causes the thyristor (TH) to block, and enables the push-pull frequency generator (3) to start oscillating again.
REFERENCES:
patent: 4346332 (1982-08-01), Walden
patent: 4438372 (1984-03-01), Zuchtriegel
patent: 4477748 (1984-10-01), Grubbs
patent: 4481460 (1984-11-01), Kroning et al.
"SIPMOS Transistors", SIEMS Application Notes, 1983, chapter 1.9, "Electrc Ballast for Fluorescent Lamps", pp. 34 et seq.
"Elektronischaltungen", (Electronic Circuits) by Walter Hirschmann, published by SIEMENS, AG, chapter B3.12, Elektronisches Vorschaltgerat fur neue Leuchtstofflampen, pp. 147-151.
Dixon Harold
Patent-Treuhand-Gesellschaft fur elektrische Gluhlampen m.b.H.
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