Patent ID: 11964334
Assignee: MAKITA CORPORATION
Field: Machine tools (Mechanical engineering)
Classification: CPC B  H | IPC B  H

Claim 1:
2. An electric powered work machine comprising:
a tool;
a motor configured to generate a driving force to drive the tool;
a manual switch configured to be manually operated by a user of the electric powered work machine;
an electric current path configured (i) to connect a power supply with the motor in response to the manual switch being manually operated and (ii) to disconnect the power supply from the motor in response to the manual switch not being manually operated;
a shunt resistor on the electric current path;
a reference voltage generation circuit configured (i) to generate a reference voltage having a first magnitude in response to a first condition being established, and (ii) to generate the reference voltage having a second magnitude in response to the first condition not being established, the first magnitude and the second magnitude being different from zero volts, and the first magnitude being different from the second magnitude; and
an electric current measurement circuit configured (i) to receive the reference voltage and a measured voltage, and (ii) to output an output voltage based on the reference voltage and the measured voltage, the measured voltage being generated across the shunt resistor in response to an electric current flowing through the shunt resistor, and the output voltage being consistent with the reference voltage in response to the electric current not flowing through the shunt resistor.