Power supply device for vehicles
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United States of America Patent
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Oct 17, 2017
Issued Date -
Oct 15, 2015
app pub date -
Oct 24, 2013
filing date -
Oct 29, 2012
priority date (Note) -
Published
status (Latency Note)
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Abstract
A first power storage portion is configured to store power generated by a generator in a vehicle, and to supply power to a motor for starting an engine and an electric device in the vehicle. A second power storage portion is connected to the first power storage portion in parallel, and configured to store power generated by the generator, and to supply power to the electric device in the vehicle. A first switch is inserted in a path between those portions. A diode is connected in parallel with the first switch such that a cathode side thereof is connected to the second power storage portion side. The controlling portion monitors a voltage of the first power storage portion and a voltage of the second power storage portion, and detects an abnormal state of the switch by comparing a voltage difference therebetween with a forward voltage drop of the diode.
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