Electric lamp and discharge devices: systems – Pulsating or a.c. supply – Plural load device systems
Patent
1979-11-19
1981-10-06
La Roche, Eugene R.
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
Plural load device systems
307 33, 315220, 315223, 315231, 315247, 315281, 315324, H05B 4124
Patent
active
042937990
ABSTRACT:
A power supply system for operating fluorescent lamps in a hazardous atmosphere comprises a 1 kHz to 500 kHz constant current power supply which feeds primary windings of transformers which are connected together in series. Fluorescent lamps are connected across the transformer secondary windings. A voltage control circuit is connected to the supply supply output to ensure that the amount of electrical energy supplied to the transformers cannot ignite the atmosphere under any normal or fault condition. Capacitors are connected in series with the transformer primary windings to reduce the circuit reactance so that, for a given level of supply voltage, an increased number of lamps can be fed with starting voltage. Due to the substantially constant current which is fed through the transformer primary windings, the situation cannot occur that the firing of one lamp prevents the others from firing. The transformers preferably include windings to feed heaters of the lamps. The lamps may be disconnected from the supply by removal of the transformer cores or by separation of the windings.
REFERENCES:
patent: 2011929 (1935-08-01), Cramp et al.
patent: 2066549 (1937-01-01), Tilles
patent: 2610310 (1952-09-01), Miles
patent: 2683241 (1954-07-01), Passmore
patent: 3743921 (1973-07-01), Legg et al.
patent: 4127798 (1978-11-01), Anderson
La Roche Eugene R.
Victor Products (Wallsend) Limited
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