HID ballast with hot restart circuit
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United States of America Patent
Stats
-
Feb 27, 2001
Grant Date -
N/A
app pub date -
Jan 29, 1999
filing date -
Jan 29, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A ballast includes a hot restart circuit for hot restart of a HID lamp. In one embodiment, the hot restart circuit includes inductively coupled first and second inductive elements coupled end to end. A first capacitor has a first terminal coupled to a point between the first and second inductive elements and a second terminal coupled to a switching element. When the switching element transitions to a conductive state, a voltage pulse is generated on the second inductive element and the corresponding pulse on the first inductive element is sufficient to achieve hot restart of the lamp. In one embodiment, the first capacitor and the second inductive provide a parallel resonant LC circuit. The resultant signal on the second inductive element increases a voltage on the first inductive element for hot restart of the lamp.
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