MULTI-BATTERY PACK FOR POWER TOOLS
First Claim
1. A power tool comprising:
- a motor;
a first battery pack;
a second battery pack;
a first switching element coupled between the first battery pack and the motor;
a second switching element coupled between the second battery pack and the motor; and
a controller coupled to the first switching element and the second switching element, the controller havinga first pulse-width modulation (PWM) output coupled to the first switching element and having a first PWM signal to selectively close the first switching element, anda second PWM output coupled to the second switching element and having a second PWM signal to selectively close the second switching element.
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Accused Products
Abstract
A power tool including a motor, a first battery pack, a second battery pack, a first switching element coupled between the first battery pack and the motor, a second switching element coupled between the second battery pack and the motor, and controller coupled to the first switching element and the second switching element. The controller includes a first pulse-width modulation (PWM) output coupled to the first switching element and a first PWM signal to selectively close the first switching element. The controller further includes a second PWM output coupled to the second switching element and a second PWM signal to selectively close the second switching element.
23 Citations
20 Claims
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1. A power tool comprising:
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a motor; a first battery pack; a second battery pack; a first switching element coupled between the first battery pack and the motor; a second switching element coupled between the second battery pack and the motor; and a controller coupled to the first switching element and the second switching element, the controller having a first pulse-width modulation (PWM) output coupled to the first switching element and having a first PWM signal to selectively close the first switching element, and a second PWM output coupled to the second switching element and having a second PWM signal to selectively close the second switching element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of operating a power tool having a motor, a first battery pack, a second battery pack, a first switching element coupled between the first battery pack and the motor, a second switching element coupled between the second battery pack and the motor;
- and a controller, the method comprising;
determining, by the controller, a state of charge of the first battery; determining, by the controller, a state of charge of the second battery; generating, by the controller, a first pulse-width modulation (PWM) signal to selectively close the first switching element to present power from the first battery pack to the motor, the first PWM signal based on the state of charge of the first battery; generating, by the controller, a second PWM signal to selectively close the second switching element to present power from the second battery pack to the motor, the second PWM signal based on the state of charge of the second battery; and driving the motor by the first battery pack and the second battery pack asynchronously. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
- and a controller, the method comprising;
Specification