Ballast for a gas-discharge lamp, particularly for motor vehicle

Details Ballast for a gas-discharge lamp, particularly for motor vehicle Ballast for a gas-discharge lamp, particularly for motor vehicle

1994-09-20

2000-10-31

Shingleton, Michael B

Electric lamp and discharge devices: systems

Special application

Vehicle

315307, 315224, 315DIG5, 315DIG7, H05B 3702

Patent

active

061407704

ABSTRACT:
The circuit comprises a switched dc/dc converter of the "fly-back" type, a second switched dc/dc converter of the "feed-forward" type, an H-shaped bridge switching circuit which is connected to the dc/dc converters and in the central branch of which the discharge lamp and an associated reactive starter device are disposed, and a control circuit which can drive the dc/dc converters and the bridge switching circuit in a manner such that, each time the lamp is switched on, a very high voltage is applied initially, in particular, in order to start the lamp, and subsequently a low voltage is applied, but with a high electrical power, in order to support the passage of a large current through the lamp during the heating (warming-up) of the lamp and during the subsequent steady operation of the lamp.

REFERENCES:
patent: 4469981 (1984-09-01), Ruff et al.
patent: 4709188 (1987-11-01), Roberts
patent: 5151631 (1992-09-01), Oda et al.

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