Electronic braking of brushless DC motor in a power tool
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United States of America Patent
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Jan 8, 2019
Grant Date -
Jan 11, 2018
app pub date -
Jun 29, 2017
filing date -
Jul 6, 2016
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A power tool is provided including a brushless direct-current (BLDC) electric motor having a stator and a rotor. The power tool includes power switches including high-side switches and low-side switches disposed on a direct-current (DC) bus line between a power supply and the electric motor, and a controller configured to electronically brake the motor by simultaneously closing the high-side switches or the low-side switches to electrically short the stator windings. In an embodiment, the controller is configured to monitor a voltage of the DC bus line, and if the voltage of the DC bus line is lower than a voltage threshold, execute electronic braking by toggling between closing the high-side switches and closing the low-side switches over braking cycles, and if the voltage of the DC bus line is greater than the voltage threshold, execute braking by closing only the high-side switches or the low-side switches over the braking cycles.
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