Cable installment type charging control device and method of operating the same

A method of operating a cable installment type charging control device for charging an electric vehicle (EV) by using power of a grid-side, the method comprising:

• delivering power of the grid-side to an EV-side through first and second relays;
• and
• detecting whether the first relay is fused through an EV-side terminal of the first relay and a grid-side terminal of the second relay and through a third relay, a first resistor, and a first photo coupler which are connected to each other in series,
• generating a driving voltage via an AC-DC converter by using AC power between the grid-side of the first relay and the grid-side of the second relay,
• wherein the detecting whether the first relay is fused on is performed via:
• a first sub fusion detecting unit comprising:
• the third relay having one end connected to the EV-side of the first relay;
• the first resistor having one end connected to the third relay;
• a first pull-up resistor having one end supplied by the driving voltage;
• and
• the first photo coupler including a light emitting diode connected between another end of the first resistor and one end of the second relay and a transistor connected between another end of the first pull-up resistor and a ground,
• wherein the transistor is turned on when the light emitting diode is emitting light, and wherein the first sub fusion detecting unit outputs a logic high signal or a logic low signal corresponding to the driving voltage according to whether a current flows through the light emitting diode, and
• wherein the method further comprises:
• turning off the third relay in a state where the first and second relays are turned off;
• and
• determining that the first relay is not fused on when the logic low signal is input and that the first relay is fused on when the logic high signal is input.