Power transmission apparatus

A power transmission apparatus, comprising:

• a power delivery circuit at a power delivery circuit side of the power transmission apparatus, configured to operably generate a power, wherein the power includes a delivery voltage at the power delivery circuit side and the delivery voltage includes a predetermined voltage level;
• and
• a load circuit at a load circuit side of the power transmission apparatus, coupled to the power delivery circuit to receive the power to generate a load current and a load voltage, wherein the power delivery circuit and the load circuit form a power transmission loop, the load circuit including:
• a load control circuit, configured to operably control the load voltage and/or the load current;
• a load voltage sensing circuit, configured to operably sense the load voltage and provide corresponding information to the load control circuit;
• a load current sensing circuit, configured to operably sense the load current and provide corresponding information to the load control circuit;
• a connector interface circuit, located on the power transmission loop, and being configured to operably couple the power delivery circuit and the load circuit and deliver the power;
• and
• a power switch, configured to operably switch the power transmission loop to be conductive or not conductive;
• wherein the load control circuit determines a voltage threshold according to the load current sensed by the load current sensing circuit, and determines whether an abnormal condition of the connector interface circuit occurs according to whether the load voltage is lower than the voltage threshold.