Apparatus for detecting malfunction of relay

An apparatus for detecting malfunction of a relay, which detects malfunction of a relay connected to a direct current (DC) link capacitor so as to block an overcurrent being generated when an operation of an inverter system starts, comprising:

• a temperature determination unit configured to determine whether or not a relay resistor is overheated based on a resistance temperature of the relay resistor being connected to the relay;
• a charging voltage determination unit configured to determine whether or not a variation value of a charging voltage of the DC link capacitor according to the operation start of the inverter system exceeds a reference variation value;
• and
• a relay malfunction determination unit configured to determine whether or not the relay is malfunctioned based on one or more the determination results whether or not the relay resistor is overheated and whether or not the variation value exceeds the reference variation value.