Power supply unit for light source and method of controlling the same
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United States of America Patent
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Mar 17, 2009
Grant Date -
Jul 31, 2008
app pub date -
Apr 12, 2007
filing date -
Jan 30, 2007
priority date (Note) -
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Abstract
A power supply unit capable of varying power supplied to a light source at timings determined by synchronization signals is provided. The power supply unit comprises an interface that receives a plurality of types of synchronization signals with different pulse widths and a control unit that changes a setting of output power supplied by the power supply unit in accordance with the pulse widths of the plurality of types of synchronization signals. The control unit includes obtaining a standard time interval from a cycle of a standard type of synchronization signal that has a longest pulse width, parsing for determining type of each synchronization signal, redefining supply power values corresponding to respective types of synchronization signals, and changing the setting of output power of the power supply unit to a supply power value corresponding to a type of the synchronization signal.
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