Lighting electromagnetic compatibility issues

Lighting is divided into high-frequency lighting and low-frequency lighting, the frequencies are respectively 200-250KHz, 2.65MHz, as a function of excitation source and interference source, these frequency points make people very entangled. Without it, the function is gone; but with it, the interference comes again. Although entangled, 'whether you should stop eating because of choking' is a question that you don't need to think about at all. We can only accept, and then think of ways to deal with its negative effects. There are two electromagnetic compatibility issues for lighting, namely conduction and radiation. Conduction is emitted through conductive cables; radiation is emitted through one or more of the non-metallic shells of the space, the gaps of the metal shells, and the wires. These two types of problems have different ideas for solving. We often encounter similar technical consultation problems during the rectification process. After talking on the phone for a long time, I thought it was conduction, but it was actually space radiation. The idea of u200bu200bconduction solution is to use the filter string on the power line and connect the grounding measures, but this is only limited to the lighting with a grounding terminal; for the lighting without a grounding terminal, that is, the power line input has only two wires (L and N, no G) For this situation, conducted interference can only be solved by consuming interference energy. There are two solutions to radiation. One is to deal with the spikes of the waveform, because there are two main sources of interference, one is the main oscillation frequency of the switch, and the other is the spike contained in the spike caused by the tr time of the rising edge of the switch. High-order harmonic components. The treatment of these two sources is the same as the conduction solution. Another main solution is the treatment of the structure, the shielding of the gap, the surface grounding of the ground, and the selection of the shell material (generally, metal materials are sufficient, but if there is interference from low-frequency magnetic fields, the problem is particularly serious. Aluminum is not suitable for materials. Material, iron steel or permalloy with higher magnetic permeability is required