Power supply device for vehicle
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United States of America Patent
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Nov 3, 2015
Grant Date -
May 17, 2012
app pub date -
May 23, 2011
filing date -
Nov 15, 2010
priority date (Note) -
In Force
status (Latency Note)
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Abstract
The invention has an object of providing a power supply device for vehicle of high efficiency while keeping longer service life of a capacitor. By supplying an electric power of a capacitor to various electronic devices for a first predetermined time period after a vehicle engine has been stopped and discharging an electric power of the capacitor to a battery for a second predetermined time period after the first predetermined time period has ended, the voltage of the capacitor is reduced. By forcing the electric power of the capacitor to discharge at a forced discharge circuit until the voltage of the capacitor is substantially equal to a predetermined voltage after the second predetermined time period has ended, the time period during which the capacitor is held at a high voltage is made shorter. Longer service life of the capacitor and higher efficiency of the power supply device can be achieved.
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Family
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