Electronic ballast with separate inverter for cathode heating

Details Electronic ballast with separate inverter for cathode heating Electronic ballast with separate inverter for cathode heating

1990-10-09

1993-01-12

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

315107, 315209R, 315DIG5, 315DIG7, H05B 4136

Patent

active

051793261

ABSTRACT:
A high-frequency electronic ballast for fluorescent lamps has a first inverter for controllably providing heating power to the lamp cathodes and a second inverter for controllably providing main lamp operating power. The two inverters are separately and independently controllable, thereby: i) to permit adjustment of lamp current so as to provide full or reduced light output in accordance with requirements, ii) to permit cathode heating power to be removed under conditions of providing full light output, thereby to maximize efficiency, and iii) to permit cathode heating power to be restored under conditions of reduced light output, thereby to prevent premature lamp failure.

REFERENCES:
patent: Re31758 (1984-12-01), Nilssen
patent: 2170448 (1939-08-01), Edwards
patent: 3383554 (1968-05-01), Oglesbee
patent: 4009412 (1977-02-01), Latassa
patent: 4256992 (1981-03-01), Luursema
patent: 4438372 (1984-03-01), Zuchtriegel
patent: 4461980 (1984-07-01), Nilssen
patent: 4513364 (1985-04-01), Nilssen
patent: 4554487 (1985-11-01), Nilssen
patent: 4588924 (1986-05-01), Luursema et al.
patent: 4622496 (1986-11-01), Dattilo et al.
patent: 4682080 (1987-07-01), Ogawa et al.

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