Device for maintaining operating state of contactor

A contactor operating state maintaining device comprising:

• a controller configured to output a contactor control signal for controlling an operation of a contactor;
• a system basis unit configured to monitor a state of the controller and to output a safety detection signal;
• an operation maintaining unit including a first level shifter configured to shift a voltage level of the safety detection signal, a second level shifter configured to shift a voltage level of the contactor control signal, a retention output unit configured to compare the voltage level of the first level shifter with the voltage level of the second level shifter and to output a retention output signal, and a timer output unit configured to output a timer output signal to output the retention output signal for a preset time;
• and
• a contactor driver configured to output a contactor driving signal based on the contactor control signal and the retention output signal,
• wherein the contactor driver is configured to perform an OR logic operation on the contactor control signal and the retention output signal and to output the contactor driving signal corresponding to a result of the OR logic operation.