Electromagnetic Interference Reduction in Mixed Electrical Class Modules based Host Systems

In electrical systems, the grounding techniques employed for modules and host devices play a crucial role in fulfilling compliance with Electromagnetic Interference (EMI) regulations. Mixing different electrical classes of modules, such as electrical class I and electrical class II, in a common host has become a necessity for businesses looking to bring products quickly to market. This paper discusses a novel approach to help manufacturers mix different electrical classes of modules while still meeting EMI requirements. The parasitic coupling environment created by some of these combinations can result in increased common mode currents and EMI issues. Additionally, the combination of different electrical classes between modules and the ground wire inductance can also have a significant effect on EMI behavior. The novel approach presented here has been demonstrated using lighting luminaries, however, the learnings can be applied to other domains beyond lighting applications, such as consumer electronics, automotive, power systems, and medical devices. The paper proposes integration insights of mixing different electrical class modules and host to ensure compliance with relevant EMI regulations and standards.