Method and apparatus of performing failure detection on ac input voltage, and power supply system

An apparatus of performing failure detection on an alternating current (AC) input voltage, the apparatus comprising:

• one or more processors;
• and
• one or more memories including computer-executable instructions thereon that, when executed by the one or more processors, are configured to cause the one or more processors to at least:
• compare the AC input voltage with a first reference voltage;
• compare the AC input voltage with a second reference voltage, the second reference voltage being less than the first reference voltage;
• and
• determine whether or not the AC input voltage has failed based on comparing results;
• wherein
• the computer-executable instructions are further configured to cause the one or more processors to at least:
• determine that the AC input voltage is normal, in response to an absolute value of the AC input voltage being greater than the first reference voltage;
• determine that the AC input voltage has failed, in response to a duration in which the absolute value of the AC input voltage is less than the second reference voltage being greater than a threshold duration;
• and
• determine that the AC input voltage has failed, in response to the absolute value of the AC input voltage being greater than or equal to the second reference voltage and less than or equal to the first reference voltage, and a duration in which an absolute value of a change rate of the AC input voltage is less than a voltage change rate threshold being greater than a predetermined time delay.

A non-transitory computer-readable storage medium including computer-executable instructions thereon that, when executed by a processor, are configured to cause the processor to at least:

• compare the AC input voltage with a first reference voltage;
• compare the AC input voltage with a second reference voltage, wherein the second reference voltage is less than the first reference voltage;
• and
• determine whether or not the AC input voltage has failed based on comparing results;
• wherein
• the computer-executable instructions are further configured to cause the processor to at least:
• determine that the AC input voltage is normal, in response to an absolute value of the AC input voltage being greater than the first reference voltage;
• determine that the AC input voltage has failed, in response to a duration in which the absolute value of the AC input voltage is less than the second reference voltage being greater than a threshold duration;
• and
• determine that the AC input voltage has failed, in response to the absolute value of the AC input voltage being greater than or equal to the second reference voltage and less than or equal to the first reference voltage, and a duration in which an absolute value of a change rate of the AC input voltage is less than a voltage change rate threshold being greater than a predetermined time delay.