Patent ID: 11955874
Assignee: MAKITA CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  B | IPC B  H

Claim 0:
1. An electric powered work machine comprising:
a motor;
a motor driver configured to control current flow to the motor, the motor driver including:
first semiconductor switching elements arranged on corresponding power-supply lines that connect terminals of the motor and a positive electrode of a battery, and
second semiconductor switching elements arranged on corresponding ground lines that connect the terminals of the motor and a negative electrode of the battery;

a control circuit including a microcomputer;
a gate driver configured to turn ON or OFF each of the first semiconductor switching elements and the second semiconductor switching elements of the motor driver in accordance with a control signal from the control circuit;
a power-source-side semiconductor switching element having a drain connected to a power-supply terminal of the battery, a source connected to the motor driver, and a gate connected to the control circuit;
a power-supply-controlling semiconductor switching element connected in parallel to the power-source-side semiconductor switching element;
a power-source-side resistor having one end connected to a drain of the power-supply-controlling semiconductor switching element and the other end connected to a source of the power-source-side semiconductor switching element; and
a voltage-dividing circuit configured to output, to the control circuit, a divided voltage obtained by dividing a connection-point voltage at a connection point between the power-source-side semiconductor switching element and the motor driver,
the control circuit including a fault determiner configured to turn OFF all of the first semiconductor switching elements, the second semiconductor switching elements, and the power-source-side semiconductor switching element to determine whether at least one of “the first semiconductor switching elements, the second semiconductor switching elements, and the power-source-side semiconductor switching element” is short-circuited based on the connection-point voltage at the connection point between the power-source-side semiconductor switching element and the motor driver.