EMC stands for Electro Magnetic Compatibility. Electromagnetic compatibility (EMC) refers to the ability of a device or system to operate within its electromagnetic environment without causing intolerable electromagnetic interference to any device in its environment. Therefore, EMC has two requirements: On the one hand, the electromagnetic interference generated by devices during normal operation does not exceed a certain threshold; On the other hand, it means that the appliance has a certain degree of immunity to electromagnetic interference existing in the environment, that is, electromagnetic sensitivity. Electromagnetic interference is any electromagnetic phenomenon that degrades the performance of a device or system.