Power source switching device and storage battery system
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United States of America Patent
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Jan 16, 2018
Issued Date -
N/A
app pub date -
Jun 23, 2014
filing date -
Sep 30, 2013
priority date (Note) -
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Abstract
A third relay switches between an output of a first AC power source fed via a first relay and an output of a second AC power source fed via a second relay, and supplies the output after the switching to a load. A welding detection unit detects welding of the first relay. In order to switch the output of the first AC power source to the output of the second AC power source and supply the output of the second AC power source to the load, a power source switching control unit switches the first relay from the closed state to the open state, switches the third relay so as to select and feed the output of the second AC power source, and then prohibits switching of the second relay from the open state to the closed state until a first-relay welding detection processing by the welding detection unit is completed.
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