Ballast for a gas-discharge lamp, particularly for motor vehicles
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United States of America Patent
Stats
-
Oct 31, 2000
Grant Date -
N/A
app pub date -
Sep 20, 1994
filing date -
Sep 30, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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