Electronic device and method of power supply protection for connection port

A method of a power supply protection for a connection port adapted to be applied to an electronic device comprising a first connection port and a first control circuit, comprising:

• obtaining a first input voltage from the first connection port through the first control circuit, obtaining a first switch activation signal, and obtaining a first forced closing signal through a first forced closing pin;
• determining a first preset value according to a state of the first switch activation signal correspondingly through the first control circuit;
• detecting whether the first input voltage is greater than the first preset value through the first control circuit;
• enabling a first abnormal signal on a first abnormal state detection pin through the first control circuit when the first input voltage is greater than the first preset value;
• determining whether the first forced closing signal is enabled through the first control circuit;
• and
• controlling a first switch to disconnect both terminals through the first control circuit when the first forced closing signal is enabled, wherein a first terminal of the first switch receives the first input voltage of the first connection port, and a second terminal of the first switch is coupled to an output terminal of the first control circuit.