Method for monitoring an electric vehicle charging apparatus, and electric vehicle charging apparatus implementing the same

An electric vehicle charging apparatus for charging an electric vehicle, comprising:

• a charging connector to be electrically connected to the electric vehicle;
• and
• a charging pile electrically connected to said charging connector for providing a charging current to the electric vehicle through said charging connector, said charging pile including:
• a power supply device operable to output and adjust the charging current;
• a power meter electrically connected to said power supply device for detecting the charging current, and configured to detect the charging current to generate an initial current value and an initial power value that correspond to an initial charging time, and a present current value and a present power value that correspond to a present time;
• and
• a processor electrically connected to said power meter for receiving the initial current value, the initial power value, the present current value and the present power value, and configured to calculate an initial resistance value of said charging connector based on the initial current value and the initial power value, and to calculate a present resistance value of said charging connector based on the present current value and the present power value;
• wherein said processor is configured to calculate an estimated present temperature value of said charging connector based on a predetermined temperature coefficient of resistance (TCR) that corresponds to said charging connector, an initial temperature value that is related to an ambient temperature, the initial resistance value, and the present resistance value;
• and
• wherein said processor is configured to compare the estimated present temperature value with an over-temperature threshold to generate a comparison result, and to determine whether to reduce the charging current based on the comparison result.