Adaptor, assembly of battery pack and adaptor, and electric tool with the same
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United States of America Patent
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Jun 23, 2015
Grant Date -
Oct 18, 2012
app pub date -
Jun 22, 2012
filing date -
Sep 19, 2006
priority date (Note) -
In Force
status (Latency Note)
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Abstract
When a battery pack having an output voltage of 14.4 V that is connectable to an electric tool in a sliding manner is used as a power supply source for the electric tool that is connectable to a battery pack in an insertion manner and has a rated voltage of 12 V, the electric tool and the battery pack are connected to each other with an adaptor interposed therebetween. The adaptor has an FET that is switched at a predetermined duty of a predetermined frequency. The battery pack and the electric tool are connected or disconnected to or from each other by the switching operation, thereby dropping the output voltage of the battery pack. When the detected voltage is out of a predetermined value range, it is judged that the overcurrent or overdischarge has occurred. Then, the FET is turned off to stop the electric tool.
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