High intensity discharge lamp ballast circuit

Details High intensity discharge lamp ballast circuit High intensity discharge lamp ballast circuit

2007-03-13

2007-03-13

Han, Jessica (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a transformer or inductor as the final control device

C323S284000, C323S225000

Reexamination Certificate

active

10800549

ABSTRACT:
An integrated circuit controls a power converter that includes single stage buck-boost converter and a switching full bridge that may be used to drive an HID lamp. The single stage buck-boost converter reduces the complexity and parts count of the power converter, or electronic ballast, while permitting PFC and DC bus voltage regulation under control of the integrated circuit. The integrated circuit also provides all the drive signals to operate the switching full bridge circuit to maintain constant power on the HID lamp. A wait timer provides an interval of time between restart attempts for the HID lamp to permit the lamp to cool so that high hot restart voltages are avoided. The integrated circuit simplifies the design of power converters and electronic ballasts in particular, while contributing to reducing part count, complexity and cost in conjunction with the single stage buck-boost converter.

REFERENCES:
patent: 5654881 (1997-08-01), Albrecht et al.
patent: 5894243 (1999-04-01), Hwang
patent: 6278245 (2001-08-01), Li et al.
International Search Report issued Oct. 14, 2005.

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