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16 Connected LED Lighting Solutions Figure 2: Schematic of TE Connectivity's new Corcom FB power line filter series specially designed for lighting devices, fluorescent lamp, and related lighting ballasts and also suitable for applications requiring 277VAC or 277VDC. (Source: TE Connectivity) lengths, the effects could differ for each house in the same neighborhood. There is also the potential for this interference (noise) to be induced back to the luminaire through wire routing, amplified by the resonances in the power circuitry or lack of a dedicated ground lead. So how do designers stop these noise sources from interfering with our other devices? They are best eliminated at the source before they are allowed to cause problems. EMI filters get designed to filter out troublesome high frequencies using a low pass or L-C filter. These filters consist of passive components such as inductors (L) and capacitors (C). The inductor allows low frequency or DC currents to pass through while blocking high- frequency currents. The capacitor provides a low impedance path to divert the high-frequency noise away from the input of the filter and either back into the power supply or the ground connection. In the schematic below (Figure 2), the resistor gets employed to help dissipate the "filtered" load. This design effectively captures the noise before it can couple with other parts of the system. In addition to assisting in meeting EMI regulations, the filter also must meet safety standards. The inductor temperature rise is measured for mains operation, and the minimum electrical spacing between line, neutral, and the ground is controlled. This effort reduces the risk of fire and electrical shock. The capacitors are also individually safety certified, depending on their position in the circuit. Special "X" capacitors are used across the input terminals to prevent short circuits and possible fire hazards. "Y" capacitors get connected from the AC circuit to the ground and avoid the possibility of electrical shocks. Remember, the FCC spec states that, parties responsible for equipment compliance should note that the limits specified in Part 15, Section 15.15, paragraph c will not prevent harmful interference under all circumstances. This statement states that a luminaire may pass under lab conditions but may not when surrounded by distribution equipment, substations, and transmission lines, among other potential sources of interference. LEARN MORE > TE Connectivity LUMAWISE Endurance S Bases with Vent