Ballast with inverter startup circuit

Details Ballast with inverter startup circuit Ballast with inverter startup circuit

2005-02-15

2005-02-15

Vu, David (Department: 2828)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

C315S219000, C315SDIG007

Reexamination Certificate

active

06856100

ABSTRACT:
A ballast (20, 20′) includes a rectifier circuit (100), a boost converter (200, 200′), an inverter (300), an output circuit (400), and an inverter startup circuit (600). Inverter startup circuit (600) is coupled between boost converter (200) and inverter (300). During operation, inverter startup circuit (600) provides a delay period between startup of boost converter (200) and startup of inverter (300) so that startup of inverter (300) is delayed until at least such time as the DC rail voltage provided by boost converter (200) approaches its steady-state operating level. This ensures that the ballast (20,20′) provides an output voltage that is sufficiently high to ignite a lamp (40) in a preferred manner, with little or no glow current and a fast strike time.

REFERENCES:
patent: 5315214 (1994-05-01), Lesea
patent: 5925990 (1999-07-01), Crouse et al.

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