Filment switch for a lamp ballast

Details Filment switch for a lamp ballast Filment switch for a lamp ballast

1990-06-21

1992-07-21

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

Pulsating or a.c. supply to the cathode or heater circuit

315101, 315107, H05B 3900

Patent

active

051325950

ABSTRACT:
A filament switch for a rapid start fluorescent lamp disconnects or reduces through phase modulation the heating current to a plurality of lamp filaments to save power. The switch uses a trigger in series with a voltage sensitive element and an impedance element, the switch being responsive to the difference between a lamp starting voltage and a lamp sustaining voltage for determining when and for how long the filaments are heated.

REFERENCES:
patent: 4010399 (1977-03-01), Bessone

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