CONTROLLED POWER FADE FOR BATTERY POWERED DEVICES
First Claim
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1. A method for operating a power tool having a motor powered by a battery, comprising:
- delivering power from the battery to the motor in accordance with an operator input;
detecting a condition of the power tool indicating a shutdown of the power is imminent; and
fading the power delivered from the battery to the motor, in response to the detected condition, through the use of a controller residing in the power tool.
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Abstract
A method is provided for operating a power tool having a motor powered by a battery. The method includes: delivering power from the battery to the motor in accordance with an operator input; detecting a condition of the power tool indicating a shutdown of the power is imminent; and fading the power delivered from the battery to the motor, in response to the detected condition, through the use of a controller residing in the power tool.
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Citations
25 Claims
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1. A method for operating a power tool having a motor powered by a battery, comprising:
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delivering power from the battery to the motor in accordance with an operator input; detecting a condition of the power tool indicating a shutdown of the power is imminent; and fading the power delivered from the battery to the motor, in response to the detected condition, through the use of a controller residing in the power tool. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A power tool system comprising:
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a tool assembly having a motor; a battery pack that selectively couples to the tool assembly and operates to provide power to the motor; and a discharge control module that monitors a parameter indicative of tool operation while power is delivered from the battery pack to the motor and fades the power delivered from the battery to the motor by an amount that is computed as a function of a value of the parameter. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method for operating a power tool powered by a battery having a plurality of battery cells, comprising:
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measuring voltage of the battery while current is being drawn from the battery; interrupting current momentarily to measure voltage of the battery in an unloaded condition; measuring voltage of the battery in an unloaded condition; comparing the unloaded voltage measure to a voltage cutoff threshold; and resuming current draw from the battery when the unloaded voltage measure exceeds the voltage cutoff threshold. - View Dependent Claims (21, 22, 23, 24, 25)
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Specification