Reactor-type ballast circuit

Electric lamp and discharge devices: systems – Pulsating or a.c. supply – With power factor control device

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Details

315 97, 315104, 315245, 315290, 315DIG5, H05B 4116

Patent

active

049143549

ABSTRACT:
An improved, more energy efficient reactor-type ballasting circuit for fluorescent lamps includes an inductive ballasting coil for directly applying an AC line voltage to the cathodes of a lamp without an intermediate autotransformer and also includes a glow type thermal switch in series with a positive temperature coefficient (PTC) resistor for electrical connection across the cathodes of the lamp to conduct pre-heating current to the lamp cathodes. The PTC resistor will effectively remove the glow switch from the ballast circuit if the switch fails to open after an appropriate time delay.

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