BALLAST FOR HIGH PRESSURE DISCHARGE LAMP
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United States of America Patent
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N/A
Issued Date -
Feb 2, 2012
app pub date -
Apr 9, 2010
filing date -
May 21, 2009
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The present invention provides a ballast for a high pressure discharge lamp including a driving circuit for supplying an alternating power to a high pressure discharge lamp. In the ballast of the present invention, the high pressure discharge lamp includes: a bulb; and a startup light source disposed in a vicinity of the bulb and assisting ignition of the bulb. The startup light source has a pair of electrodes which are capacitively coupled. The driving circuit includes: a bridge unit for inverting a lamp current; a current regulator unit for regulating the lamp current; and an igniter unit for generating an ignition voltage. At the ignition, a voltage containing a frequency component higher than a driving frequency during a steady driving of the bulb is applied to the startup light source.
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