Coil control device of electronic magnetic contactor

A coil control device of an electronic magnetic contactor, comprising:

• an input power processing unit configured to convert and output an input power into a direct current power;
• an input voltage detecting unit configured to detect a voltage level of the direct current power outputted from the input power processing unit;
• a control unit configured to output a control signal for controlling current flowing in a coil using the voltage level detected by the input voltage detecting unit;
• and
• a switching unit configured to connect or cutoff the current flowing in the coil by switching according to the control signal from the control unit,
• wherein the control unit includes a microcontroller that compares the voltage level detected by the input voltage detecting unit with a preset reference level and generates a PWM signal according to a result of the comparison, and a gate driver receives the PWM signal from the microcontroller and transmits it to the switching unit and is configured to block noise from the coil,
• wherein the gate driver is a photo coupler, and in the absence of a signal, the microcontroller and the switching unit are physically isolated, and
• wherein the microcontroller outputs a suction signal as the PWM signal when the voltage level detected by the input voltage detecting unit is greater than the preset reference level, and the microcontroller outputs a release signal as the PWM signal when the voltage level detected by the input voltage detecting unit is lower than the preset reference level.