Power source device and output voltage changing method of the power source device
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United States of America Patent
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Aug 6, 2013
Grant Date -
Jan 27, 2011
app pub date -
Apr 7, 2009
filing date -
Apr 11, 2008
priority date (Note) -
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Abstract
A power source device includes a main power source circuit, a sub power source circuit whose output voltage is changed when the output voltage of the main power source circuit is changed, a voltage difference detecting circuit which detects whether a voltage difference between the output voltages of the main and sub power source circuits is within a predetermined voltage difference, and a voltage control circuit which controls the output voltages of the main and sub power source circuits based on a voltage changing signal and an output from the voltage difference detecting circuit. The voltage control circuit controls so that the voltage difference between the output voltages of the main and sub power source circuits is within the predetermined voltage difference by controlling output voltage changing speed when the voltage difference between the output voltages of the main and sub power source circuits is over the predetermined voltage difference.
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