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ELECTRONIC BRAKING IN A POWER TOOL

  • US 20190207539A1
  • Filed: 01/03/2019
  • Published: 07/04/2019
  • Est. Priority Date: 01/03/2018
  • Status: Active Grant
First Claim
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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.

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