Two level inverter circuit

Details Two level inverter circuit Two level inverter circuit

1975-12-18

1977-06-14

La Roche, Eugene R.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch in the primary circuit of the supply...

307 66, 315 86, 315209R, 315DIG5, 331183, H05B 4129

Patent

active

040299937

ABSTRACT:
An emergency lighting system includes a two-level switching transistor inverter circuit for starting and operating a fluorescent lamp from a battery upon failure of line voltage. One of the switching transistors of the two transistor inverter is arranged for connection first to a tap, then to one of the feed-in terminals of an output transformer coupled with the lamp. A timing controller effects this switching thereby automatically to provide, first, a high power level for starting the lamp, and then, a second lower power level for operating the lamp after starting.

REFERENCES:
patent: 3573544 (1971-04-01), Zonis et al.
patent: 3688123 (1972-08-01), Walker
patent: 3743921 (1973-07-01), Legg et al.
patent: 3882357 (1975-05-01), Nieuweboer et al.
patent: 3921005 (1975-11-01), Watrous

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