System sharing battery with external device
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United States of America Patent
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Apr 9, 2019
Grant Date -
Jan 11, 2018
app pub date -
Jul 6, 2017
filing date -
Jul 7, 2016
priority date (Note) -
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status (Latency Note)
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Abstract
In a system that shares a battery with an external device, the system includes a power storage device connected to the battery via a power supply line. The system includes a switch provided on the power supply line, and a control unit. The control unit controls on-off switching operations of the switch to selectively establish an electrical conduction between the battery and the power storage device or interrupt the electrical conduction therebetween. The battery has a battery voltage thereacross, and the power storage device has a power-storage voltage thereacross. The battery charges the power storage device while the electrical conduction is established so that the power-storage voltage follows the battery voltage. The control unit turns off the switch when the battery voltage is in a predetermined insufficient voltage state to prevent electrical power charged in the power storage device from being discharged to the battery.
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