Bridge inverter ballast for fluorescent lamp

Details Bridge inverter ballast for fluorescent lamp Bridge inverter ballast for fluorescent lamp

1986-05-30

1990-08-14

Moore, David K.

Electric lamp and discharge devices: systems

Discharge device and/or rectifier in the supply circuit

Flashers

315106, 315107, 315DIG5, 315DIG7, H05B 3700

Patent

active

049490150

ABSTRACT:
A full-bridge inverter ballast for a fluorescent lamp comprises two pairs of switching transistors and is conditionally operable to self-oscillate in either of two modes: a first mode wherein one of the two pairs of switching transistors self-oscillates in manner of a half-bridge inverter and powers the thermionic cathodes of the fluorescent lamp, and a second mode wherein both pairs of transistors self-oscillate in manner of a full-bridge inverter and then powers the main gas discharge of the fluorescent lamp. The first mode gets initiated immediately upon applying power to the ballast, but the second mode does not get initiated until about 1.5 seconds after the initiation of the first mode. The way, the cathodes will have become fully thermionic prior to applying main power to the fluorescent lamp.

REFERENCES:
patent: 4256992 (1981-03-01), Luursema
patent: 4259614 (1981-03-01), Kohler
patent: 4588924 (1986-05-01), Luursema et al.
patent: 4700287 (1987-10-01), Nilssen

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