Power tool powered by power supplies having different rated voltages
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United States of America Patent
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May 14, 2019
Grant Date -
Mar 15, 2018
app pub date -
Nov 17, 2017
filing date -
May 18, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
A power tool is provided including a brushless motor having a rotor and a stator. A power supply interface is arranged to selectively receive a first power input from a first power supply having a first nominal voltage and a second power input from a second power supply having a second nominal voltage, where at least the first nominal voltage does not fall within approximately the operating voltage range of the motor. A motor control circuit is provided including a power switch circuit having power switches that supply electric power from at least one of the first power input or the second power input to the motor, and a controller that controls a switching operation of the power switches to optimize the supply of electric power from the first power input at a level corresponding to the operating voltage range of the motor.
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