Power cord photocoupler leakage current detection interrupter (LCDI) and electrical appliance using same

A power cord photocoupler leakage current detection interrupter (LCDI), comprising:

• a switch unit provided between an input terminal and an output terminal, and configured to control the input terminal and the output terminal to turn on or off;
• a leakage current detection line wrapped with a power cord, and configured to detect whether the power cord has a leakage current, wherein the power cord is connected between the switch unit and the output terminal;
• a leakage current interruption unit connected to the switch unit and the leakage current detection line, and configured to detect a leakage current signal of the leakage current detection line, and send a corresponding control signal to the switch unit according to the leakage current signal;
• a test unit connected between the input terminal and the output terminal and connected to the leakage current detection line, the test unit including a test switch disposed in a plug portion, an additional signal line routed within the power cord and disposed beneath a metal outer layer of the power cord, and a discrete resistor disposed within the power cord beneath the metal outer layer;
• wherein the leakage current detection line is connected between the test switch and the discrete resistor;
• and wherein closing the test switch injects a current into the leakage current detection line through a test loop that includes the additional signal line and the discrete resistor within the power cord;
• and
• the plug portion and the power cord, wherein the power cord is externally connected to the plug portion;
• the plug portion is configured to mount the switch unit, the leakage current interruption unit and the test unit;
• and the power cord comprises an insulated protective layer covering the metal outer layer, a live line, a neutral line, a ground line, the leakage current detection line, the additional signal line and the discrete resistor, wherein the metal outer layer covers the live line, the neutral line, the ground line, the leakage current detection line, the additional signal line and the discrete resistor.