Circuit for driving 3-phase motor

A circuit for driving a 3-phase motor, comprising:

• an inverter circuit configured to drive a 3-phase motor;
• a power supply configured to supply an inverter driving voltage and an inverter fault detection voltage to the inverter circuit;
• and
• a controller configured to select a voltage supplied by the power supply to the inverter circuit, depending on whether the 3-phase motor is driven,
• wherein:
• the controller is configured to determine a fault state of the inverter circuit by periodically detecting voltage levels of a plurality of designated nodes of the inverter circuit;
• the controller is configured to:
• apply the inverter driving voltage to the inverter circuit when the 3-phase motor is driven;
• and
• apply the inverter fault detection voltage to the inverter circuit when the 3-phase motor is not driven;
• detect voltages at the designated nodes of the inverter circuit for driving the 3-phase motor;
• compare the detected voltages to voltages stored in a lookup table;
• and
• determine states of the respective switch elements in the inverter circuit
• depending on the detected voltages;
• and
• the voltages detected at the designated nodes for the voltages applied to the respective switch elements of the inverter circuit, depending on a normal state or fault state, are stored in the form of a lookup table in advance.