title: COSEL Power Supply, Noise Filter 2025 Product Catalog

Summary

COSEL Power Supply, Noise Filter 2025 Product Catalog

1Noise Basics1 What Is Noise?3 What Is EMC?Noises refers to unwanted variations or fluctuations involtage, current, signals, etc.EWhat a designer expectsIn reality, noises are included.(an ideal steady voltagesource)Figure 1.1.1 What Is Noise?2EGNDNoise SourcesNoise comes in two types: natural noise and manmade noise.While natural noises are generated by a lightning strikeor static electricity, manmade noises are generated byfamiliar devices such as industrial equipment, fluorescentbulbs, or communication equipment.NoiseNaturalNoiseManmadeNoiseLightning strike, static electricity,cosmic rayDischarge noise due to fluorescentbulbs, etc., switching noise due toinverters and switching powersources, radio communicationequipment, radio waves transmittedfor broadcasts, wireless LAN,cellphonesFigure 1.2.1 Noise SourcesTypical devices that generate noise are switchingpower sources and general-purpose inverters.Such devices include switching elements such asFETs and IGBTs, and are major noise sources due tohigh-frequency switching of those elements.EMC stands for electromagnetic compatibility, and refersto the ability of electrical equipment to have both EMIand EMS at once; the former indicates the ability tosuppress noise radiated from the equipment itself andthe latter means the ability to endure noise from otherequipment.What are EMC compliant products?The EMC compliant products refer to those that meetstandards required by EMI and EMS.They provide various types of parts that can deal withnoise from the viewpoint of EMI and/or EMS.Our noise filters (hereinafter,“EMI filters”) are parts thatmainly deal with conducted interference in terms of EMI.EMCElectroMagneticCompatibilityEMC = EMI + EMSEMIElectroMagneticInterferenceEMSElectroMagneticSusceptibilityFigure 1.3.1 Concept of EMCConducted InterferenceNoise propagated andleaked from power linesRadiation InterferenceNoise radiated from chassis,cables, etc.Conducted ImmunitySurge: Noise such as onedue to lightning strikesRadiation ImmunityRadiation field: Noise such asone due to radio equipmentRectificationcircuitAC DCSmoothingcircuitDCInvertercircuitDC ACMotorMSub powersupplycircuitControlcircuitFigure 1.2.2 Inverter block diagramT1D1T1 T3 T5VCCC1RLMTR1T2 T4 T6Figure 1.2.3 Sub power supplyinverter operation waveformFigure 1.2.4 InverterPWM output waveformTechnical Notes-2