ELECTRONIC BRAKING IN A POWER TOOL
First Claim
1. A battery powered power tool, comprising:
- a three-phase DC motor;
a power switching network, comprising a plurality of high side electronic switches and a plurality of low side electronic switches, wherein a first phase of the motor is connected between a first low side electronic switch and a power source electronic switch, and further connected to the power source via a first high side electronic switch, the first high side electronic switch in parallel with a diode;
a power source; and
an electronic processor in communication with the power switching network and configured to;
receive an indication to stop the motor during operation of the motor;
activate the first low side electronic switch and a second low side electronic switch for a first predetermined time in response to receiving the indication to stop the motor, such that a back-electromagnetic force generated by the motor is stored in the first phase of the motor; and
deactivate the second low side electronic switch after the first predetermined time such that a first regenerative current is provided to the power source via the diode.
1 Assignment
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Accused Products
Abstract
A power tool including a three-phase DC motor, a power switching network, a power source, and an electronic processor. A first phase of the motor is connected between a first high side electronic switch and a first low side electronic switch, and between a second high side electronic switch and a second low side electronic switch. The first high side electronic switch is parallel to the second high side electronic switch, and the first low side electronic switch is parallel to the second low side electronic switch. The electronic processor receives an indication to stop the motor, and deactivates the first high side electronic switch and the first low side electronic switch, and activates the second high side electronic switch and the second low side electronic switch such that the back-electromagnetic force generated by the motor is connected in a second polarity relative to the power source.
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Citations
20 Claims
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1. A battery powered power tool, comprising:
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a three-phase DC motor; a power switching network, comprising a plurality of high side electronic switches and a plurality of low side electronic switches, wherein a first phase of the motor is connected between a first low side electronic switch and a power source electronic switch, and further connected to the power source via a first high side electronic switch, the first high side electronic switch in parallel with a diode; a power source; and an electronic processor in communication with the power switching network and configured to; receive an indication to stop the motor during operation of the motor; activate the first low side electronic switch and a second low side electronic switch for a first predetermined time in response to receiving the indication to stop the motor, such that a back-electromagnetic force generated by the motor is stored in the first phase of the motor; and deactivate the second low side electronic switch after the first predetermined time such that a first regenerative current is provided to the power source via the diode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for braking a motor in a battery powered power tool, comprising:
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receiving an indication at an electronic processor to stop the motor during operation of the motor, the electronic processor in communication with a power switching network, comprising a plurality of high side electronic switches and a plurality of low side electronic switches, wherein a first phase of the motor is connected between a first low side electronic switch and a power source electronic switch, and further connected to a power source of the power tool via a first high side electronic switch, wherein the first high side electronic switch is electrically parallel with a diode; activating the first low side electronic switch and a second low side electronic switch for a first predetermined time in response to receiving the indication to stop the motor, such that a back-electromagnetic force generated by the motor is stored in the first phase of the motor; and deactivating the second low side electronic switch after the first predetermined time such that a first regenerative current is provided to the power source via the diode. - View Dependent Claims (11, 12, 13)
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14. A power tool comprising:
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a three-phase DC motor; a power switching network comprising a plurality of high side electronic switches and a plurality of low side electronic switches, wherein a first phase of the motor is connected between a first high side electronic switch and a first low side electronic switch, and further connected between a second high side electronic switch and a second low side electronic switch, wherein the first high side electronic switch is electrically parallel to the second high side electronic switch, and the first low side electronic switch is electrically parallel to the second low side electronic switch; a power source; and an electronic processor configured to; receive an indication to operate the motor; activate the first high side electronic switch and the first low side electronic switch, in response to receiving the indication to operate the motor, to operate the motor such that a back-electromagnetic force generated by the motor is connected in a first polarity relative to the power source; receive an indication to stop the motor; and deactivate the first high side electronic switch and the first low side electronic switch, and activate the second high side electronic switch and the second low side electronic switch in response to receiving the indication to stop the motor, such that the back-electromagnetic force generated by the motor is connected in a second polarity relative to the power source. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification