Instant start for an electronic ballast preconditioner having an

Details Instant start for an electronic ballast preconditioner having an Instant start for an electronic ballast preconditioner having an

1995-05-31

1998-11-10

Pascal, Robert

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315DIG5, 315247, H05B 4136

Patent

active

058349065

ABSTRACT:
An electronic ballast for driving a fluorescent lamp includes an electromagnetic interference (EMI) filter and power circuit, a preconditioner coupled to the EMI filter and power circuit and an inverter circuit coupled to the preconditioner for energizing the fluorescent lamp. The preconditioner includes an active power factor controller and a boost circuit which is controlled at least in part by the active power factor controller. The active power factor controller has a reference voltage input to which is applied a reference voltage. At start up, the inverter provides a time varying signal which is rectified. At least a portion of the rectified signal is fed back to the reference voltage input of the active power factor controller to boost the reference voltage to a level above normal so that the active power factor controller will cause greater current to flow through the boost circuit, causing the boost circuit to generate a direct current (DC) rail voltage more rapidly, which rail voltage is provided to the inverter circuit to ignite and operate the fluorescent lamp.

REFERENCES:
patent: 4952849 (1990-08-01), Fellows et al.
patent: 5214355 (1993-05-01), Nilssen
patent: 5363020 (1994-11-01), Chen et al.
patent: 5402043 (1995-03-01), Nilssen
patent: 5463284 (1995-10-01), Mattas
patent: 5528111 (1996-06-01), Konopka et al.
"Power Factor Controller", pp. 1-11; Aug. 93Ref. 1.1 Feb. 1994 by LinFinity Microelectronics, Inc.

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