Abnormal connection detection method

An abnormal connection detection method for detecting an abnormal connection between a power supplier and a power receiver, wherein the power supplier and the power receiver are connected through a cable, the cable includes positive and negative power transmission lines, the abnormal connection detection method comprising:

• providing an output voltage from the power supplier and gradually increasing a level of the output voltage, wherein, before a load in the power receiver starts a normal operation, the level of the output voltage is lower than a predetermined voltage threshold, wherein the predetermined voltage threshold is lower than a voltage required for the normal operation of the load in the power receiver;
• determining, according to the output voltage, whether a slope of an output current generated by the power supplier is higher than a predetermined slope threshold during a predetermined time period, wherein the predetermined time period is a time period before the load in the power receiver starts the normal operation;
• and
• when the slope is higher than the predetermined slope threshold during the predetermined time period, determining that an abnormal connection occurs between the power supplier and the power receiver.