Solid state circuit breaker and motor driving system

A motor driving system comprising:

• an electrical motor;
• a power source for providing a DC voltage;
• and
• a solid state circuit breaker coupled between the electric motor and power source, the solid state circuit breaker comprising:
• a solid state switch having a gate electrode, a source electrode, and a drain electrode;
• an inductor connected in series with the solid state switch;
• a gate driving circuit configured to supply a switching control signal to the gate electrode;
• a voltage measurement device configured to measure a voltage between the source electrode and the drain electrode;
• and
• a fault detection circuit configured to detect whether an overheating fault occurs on the solid state switch based on the switching control signal and the measured voltage between the source electrode and the drain electrode, the overheating fault occurring when the switching control signal is a high level and the measured voltage between the source electrode and the drain electrode is greater than a predetermined voltage threshold.

A solid state circuit breaker comprising:

• a solid state switch having a gate electrode, a source electrode, and a drain electrode;
• an inductor connected in series with the solid state switch;
• a gate driving circuit configured to supply a switching control signal to the gate electrode;
• a voltage measurement device configured to measure a voltage of two terminals of the inductor;
• and
• a fault detection circuit comprising a comparator configured to compare the measured voltage of two terminals of the inductor with a reference voltage and output a comparison result, the fault detection circuit configured to detect whether an open circuit occurs on the solid state switch based on the comparison result and the switching control signal.