Electric working machine and voltage suppressor circuit for electric working machine

A voltage suppressor circuit for an electric working machine, the electric working machine including a main current path arranged between a positive electrode and a negative electrode of a battery;

• a driving unit situated in the main current path and including a motor situated in the main current path and at least one first semiconductor switching element situated upstream and/or downstream of the motor in the main current path;
• and a controller configured to turn ON or OFF the at least one first semiconductor switching element to control drive of the motor,
• the voltage suppressor circuit comprising:
• a bypass current path arranged in parallel with the driving unit;
• a second semiconductor switching element situated in the bypass current path and configured to complete or interrupt the bypass current path;
• and
• a switch driver configured to cause the second semiconductor switching element to interrupt the bypass current path in response to the voltage of a drive voltage being less than a threshold value, the switch driver further configured to cause the second semiconductor switching element to complete the bypass current path in in response to the voltage value being equal to or greater than the threshold value, and the drive voltage being applied to the driving unit,
• the voltage suppressor circuit being installed in the electric working machine and being arranged in parallel with at least the driving unit situated on a main current path.

A machine comprising:

• a motor;
• a switching circuit configured to receive a drive voltage and to power the motor;
• a controller configured to control the switching circuit;
• and
• a voltage suppressor including:
• a bypass current path configured to pass a bypass current to a ground under specified conditions, and
• a switch driver.