Detection of relay contactor movement

A system, comprising:

• a first comparator that is configured to generate a comparison signal SP, the comparison signal SP having a first value when a voltage that is applied at one end of a contact coil of a relay is above a threshold VP and a second value when the voltage is below the threshold VP;
• a second comparator that is configured to generate a comparison signal SD, the comparison signal SD having the first value when the voltage is above a threshold VD and the second value when the voltage is below the threshold VD;
• and
• a processing circuitry that is configured to detect whether the relay is in a faulty state based on the comparison signals SP and SD, and generate an indication of a fault when the relay is detected to be in a faulty state.

A method, comprising:

• detecting a metric of a relay;
• detecting whether the metric has crossed a threshold;
• when the metric has crossed the threshold, detecting a duration for which the metric remains past the threshold;
• and
• generating an unintended movement error when the metric remains past the threshold for less than a lower bound duration.

A system, comprising:

• a processing circuitry configured to:
• detect a metric of a relay;
• detect whether the metric has crossed a threshold;
• when the metric has crossed the threshold, detect a duration for which the metric remains past the threshold;
• and
• generate an unintended movement error when the metric remains past the threshold for less than a lower bound duration.