Circuit arrangement and method for operation of a high-pressure discharge lamp below its nominal power
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United States of America Patent
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Issued Date -
Sep 5, 2013
app pub date -
Oct 24, 2011
filing date -
Nov 9, 2010
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
In various embodiments, a method for operating a high-pressure discharge lamp below its nominal power is provided, wherein the high-pressure discharge lamp is operated at nominal power with an alternating current having a predetermined operating frequency, and the lamp voltage is measured during a half-cycle at least at the start of a half-cycle and at the end of a half-cycle. The method may include: reducing the present operating frequency below an upper limit; and changing the current shape of the alternating current to a monopitch roof-shaped current shape, which is dependent on the difference in the lamp voltages at the end and at the start of the half-cycle.
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