Snubber circuit for a hand held power tool
First Claim
Patent Images
1. A hand held power tool comprising:
- a trigger;
a motor;
an output unit driven by the motor;
a switch bridge operable to selectively provide power to the motor to drive the output unit in response to activation of the trigger; and
a snubber circuit electrically connected in parallel across the switch bridge, the snubber circuit operable to store energy when power is being provided to the motor and release the energy when power is not being provided to the motor.
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Abstract
A hand held power tool including a trigger, a motor, an output unit driven by the motor, a switch bridge, and a snubber circuit. The switch bridge is operable to selectively provide power to the motor to drive the output unit in response to activation of the trigger. The snubber circuit is electrically connected in parallel across the switch bridge. The snubber circuit is operable to store energy when power is being provided to the motor, and release the energy when power is not being provided to the motor.
6 Citations
25 Claims
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1. A hand held power tool comprising:
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a trigger; a motor; an output unit driven by the motor; a switch bridge operable to selectively provide power to the motor to drive the output unit in response to activation of the trigger; and a snubber circuit electrically connected in parallel across the switch bridge, the snubber circuit operable to store energy when power is being provided to the motor and release the energy when power is not being provided to the motor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A hand held power tool comprising:
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a motor; an output unit driven by the motor; a switch bridge operable to selectively provide power to the motor; and a snubber circuit electrically connected to the switch bridge in a parallel-type configuration, the snubber circuit including a capacitor configured to store magnetic-field energy when power is being provided to the motor and release the magnetic-field energy when power is not being provided to the motor. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method for controlling unclamped inductance in a power tool including a motor, an output unit driven by the motor, a switch bridge, and a snubber circuit, the method comprising:
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receiving power at the switch bridge; selectively providing power to the motor; storing energy in the snubber circuit when power is being provided to the motor; and releasing the energy stored in the scrubber circuit when power is not being provided to the motor. - View Dependent Claims (24, 25)
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Specification