US 11,056,302 B2
Coil control device of electronic magnetic contactor
Hyungeun Cho, Anyang-si (KR)
Assigned to LSIS CO., LTD., Anyang-si (KR)
Filed by LSIS CO., LTD., Anyang-si (KR)
Filed on Sep. 27, 2019, as Appl. No. 16/586,283.
Claims priority of application No. 10-2019-0027726 (KR), filed on Mar. 11, 2019.
Prior Publication US 2020/0294744 A1, Sep. 17, 2020
Int. Cl. H01H 47/24 (2006.01); H01H 47/00 (2006.01); H01H 47/32 (2006.01); H01H 50/44 (2006.01)
CPC H01H 47/001 (2013.01) [H01H 47/24 (2013.01); H01H 47/32 (2013.01); H01H 50/44 (2013.01)] 4 Claims
OG exemplary drawing
 
1. 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.