Power source device for vehicle
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United States of America Patent
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Jul 12, 2016
Grant Date -
Apr 3, 2014
app pub date -
Jun 25, 2012
filing date -
Jun 28, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
A vehicle power source device reliably turns on a high voltage battery even if the output voltage of a low-voltage ancillary battery drops at the start of driving the vehicle. A request to run on a high-voltage battery (to turn on a relay contact point) is made by means of the operation to start driving a vehicle. A low-voltage ancillary battery and an auxiliary battery supply power to a power source circuit. A relay control unit supplied with power from the power source circuit turns on the relay contact point and turns on the high-voltage battery. When the high-voltage battery is on, the auxiliary battery is charged by means of a step-down circuit. The auxiliary battery holds the charged power by means of a diode without the power being consumed by a group of low-voltage loads.
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